BE372130A - - Google Patents

Description

         

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 EMI1.1
 



  Improvements or devices electrical control for deceie; ld position a'appariLs situas in Qitnce, and their tl; .t.
 EMI1.2
 



  The present invention relates to aes per-
 EMI1.3
 rectionnttments to devices with control of remote devices, and, although more specially intended to indicate or to allow reading, at a central station. .e}! 1es inuicdtions a'ap-) CLei.J..8 does not measure (one under-sts, tion, it saw ae itself that -The object of the invention is also applicable in aes airrerentes circumstances.



  The main object of the invention is to rebuild W,
 EMI1.4
 upon obtaining ae nature checks carried out by

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 use of a single circuit which is not necessarily a metal circuit.



   For this purpose, the system which is the subject of the invention comprises devices making it possible to obtain readings of measuring devices or indications relating to switches or (circuit breakers, or even more. to transmit signals telegraphically on a circuit identical to those used for telephone communications.



   Another characteristic of the system is that the remote monitoring in question is obtained by means of currents at acoustic frequency transmitted over a circuit (uniquely comprising telephone repeaters.



   According to another characteristic, the connection between a given apparatus of the substation and another given apparatus of the central station is controlled by the continuous transmission to the circuit of the line of a current of a special electro-acoustic frequency, tan - say that the subsequent transmission (the currents of different acoustic frequencies, according to a code corresponding to the signal to be transmitted, is used to cause, at the remote station, the necessary selective operations or the transmission of the particular signals to be sent.



   The object of the invention will be described below, in its applications to a system using only forward currents, and to a system using currents of acoustic frequency.
 EMI2.1
 



  In the attached drawing, Ifs rie- 1 to 9 show the control devices of Laj SOlls-station, e'Y)

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Figs. 10 to 15 show the control devices of the central station o
The set of said figures aoit hearth arranged in the manner indicated in the diagram of FIG. 15a, so as to constitute a complete circuit according to the invention, the said circuit using a current of acoustic frequency for the needs of the transmission. to the different figures,
Fig. 1 shows the substation's control switch and various control relays cooperating with said switch.



   Fig 2 shows the substation SSS selector switch which is arranged to cooperate with the SCS switch (fi go 1) for the purpose of selecting various circuits of the substation.



   Fig. 3 shows. The SPC switch controlling the pulses from the substation to the central station and, also, the telephone connections to the substation.



   Fig. 8 shows the circuit breaker and branch change switch BTS, by means of which the position of the switches and branch change switches can be signaled to the central station.



   Fig. 5 shows the devices cooperating with the Midworth dynamometer, as well as a total load indicator.



   Figs. 6 and 7 show the receiver and transmitter equipment of the acoustic frequencies installed at the substation

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 EMI4.1
 The fi'ig. 8 shows the'comuiu'tateui <x automatic acting in combination with the telegraphic receiver headset of the substation.



   Fig. 9 shows various sets of worm relay
 EMI4.2
 topping controlled by the operation of the corresponding switches and brtlDchUJl1ent change switches.



   Fig. 10 and 11 show the receivers and transmitters of the acoustic frequencies of the central station.
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  The rod 12 shows the commutcàteuw OSS selector of the central station which there transmits pulses to the substation in accordance with the position in which the contacts of its board are brought.
 EMI4.4
 



  Fig. 13 shows at its upper part various manipulators for the selection of measuring instruments, mounted on a table indicttteul ', while its lower part shows the springs which are actuated
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 by the rotary arm of the main telegraph switch to transmit various instructions to the substation.
 EMI4.6
 Fig. 14 shows the MCS switch for the connection of the measuring devices which is activated by
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 synchronism with the switch is! (fig. 12) to establish the connection with a determined measuring instrument, such as the one shown in the upper part of fig.



    15, also comprising several automatic relocking operations controlled by the CET switch which is actuated in synchronism with the BTS switch of the
 EMI4.8
 substation (fig. 4 ,,,), Figs. 5, 8,9, I3 and 15 above combined with the figs 16-21 are disPoséche i .li, ue fig.

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 EMI5.1
 



  22g so as to form a complete circuit following lupine ventions when using the. signaling by direct current
Among these additional views:
 EMI5.2
 The fridge 16 shows the SCO control switch of the substation and dirrerente relay ue corrxaenaeo
The freeze. 17 shows the selector switch 308 of .The substation which acts in combination with .The
 EMI5.3
 e anmutateur ses Fig.> 18 shows different control relays acting in combination with the circuit breaker switch and change of connections r <epr, exentés by fig 19 and which controls the transmission, to the xtat% or centawlegà.e signals corresponding to the respective position of the switches.



  Na figo 20 shows the electric switch (BS of the central station which transmits signals to the substation, according to the arrangement of the contacts of its board.



   Figo 21 shows the measuring instruments connection switch, which acts in synchronism with
 EMI5.4
 the GOS switch to establish the connection with the appropriate measuring instrument.



   To better understand the principles of the invention and before entering into a detailed description of the circuits, an explanation will first be given of the remote connections existing between the substation and the central station and c This is the aim of fig 23 which shows the essential connections in the more delicate case where the installation comprises devices

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 tifs at acoustic frequencies.



   Referring more particularly to FIG.



  23, assume that an employee of the central station wishes to obtain a reading from a measuring instrument of the substation. For this purpose, he will operate a manipulator of the CIB indicator board of the central station, which corresponds to the measuring device which is to be read.

   By this means a determined contact of the contact panel of a control contactor forming part of the control group CCC of the central station will be marked and the switch put into operation at the same time as this marking and after the time required for the appropriate reheating of the valve threads used, it will be transmitted by the line circuit, and the acoustic frequency equipment CVF of the central station, an appropriate number of pulses with a current of one. electro-acoustic frequency to the acoustic frequency current equipment of the substation, where, these pulses are amplified to a sufficient extent to determine the operation of a pulse relay which is interposed in the anode circuit of the last valve.



   By this means, certain switches of the substation are actuated progressively in synchronism with the switch of the central station and bring their contact levers to a position determined by the contact marked so as to establish a circuit through the Midworth device. appropriate from the MID group.

   Once the connection has been established with the desired measuring device of the substation, a transmission occurs.

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 EMI7.1
 pulses in the opposite direction, and it will then be transmitted to the central station, by the same circuit., the pulses characteristic of the indication given by the apparatus
 EMI7.2
 above measurement, these impuzions having the effect of activating a corresponding mechanical counter of the MM group and thus materializing an indication corresponding to
 EMI7.3
 the nature and number of pulses received. At the end of this reading maneuver The employee of the. the central station will then return the display panel manipulator to its initial position dt all the connections established will thus be returned to their normal position.

   We will now assume that a switch or
 EMI7.4
 branch change switch where the substation has changed position, and the signaling mode of this change will be briefly exposed!
With each switch and changeover switch is combined a worm relay.
 EMI7.5
 mechanical rouiiimge located in the ILR designated group of the substation. This relay is each time arranged in such a way as to be able to take it from the two positions.
 EMI7.6
 which corresponds to the position of the switch or of the change-over switch at any given moment.



     At the central station is also installed a similar group of mechanical locking relays belonging to group 2LR and arranged so as to take positions corresponding to those of said
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 group IIt relay for the purpose of lighting appropriate warning lamps on the CIB indicator panel of the central station and thus ensuring at all times a

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 optical indication of the position of the various interrup turns and changeover switches of the soue-'station.



   Let us now suppose that, during normal maneuvers, a switch or a branching switch of the substation changes position: the corresponding mechanical locking relay assigned to said switch or switch will also change position and trip in a switch. control switch group of the substation control switch to which contact panels lead to connections of all mechanical locking relays of the ILR group.

   Therefore, since the control switch of the substation is forced to make a full turn for each change of position on a switch or branch switch, it is evident that the contact levers are able to ensure the transmission of signals in accordance with the potential potential of the contacts of their contact board, corresponding to the position of the mechanical locking relays.

   These signals are in turn transmitted over the line circuit at the medium of acoustic frequencies which are amplified at the central statmon to an extent sufficient to ensure the operation of a similar set of mechanical interlock relays located in the group. 2LR and which was mentioned above.

   By this means, the mechanical locking remakes of the two groups will be placed in a position corresponding to each complete revolution of the control switch of the substation, and, since the group of relays at the central statmon / is arranged

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 in order to control appropriate lamps from the central CIB indicator board, the position of the switches at that particular instant is materialized in a manner -si- sible for the supervisor on duty. He remembers to note this also that at cati where a switch changes position while a meter reading etc ... is in progress,

   such meter reading operations will be instantly suspended and switch indications will always have priority.



  Subsequently, however, once the indications relating to the switches have been announced, operations relating to the reading of the respective instrument may continue in the normal manner.



   Telegraph signaling is also provided between the central station and the substation and, for this purpose, when it is desired to transmit to the substation, certain specific instructions to advance the rotating arm of the main telegraph switch located at The central station in the CTH group will be brought to a corresponding position, which results in actuating appropriate sets of springs so as to produce a pointing to the connection board of the control switch to the CCG group of which it is necessary. was mentioned above,

   in such a way that pulses of acoustic frequency will be transmitted to the substation with the aim of bringing a similar switch to the same relative position and causing the lighting of a specific indicator lamp of the telegraph equipment main STH of the substation, placed in front of a specific abbreviated instruction, to which it is desired that the supervisor of the

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 substation responds.



   As soon as he sees the signal, the substation supervisor will immediately move the rotating arm of his own main telegraph switch to a position corresponding to the lamp which has gone out.



  This maneuver will result in sending back over the line to the central station a repeater signal to indicate to the central statmon employee that the instruction sent by him has been correctly received at the substation. Returning the substation switch and the central station to their original position will determine the return of all the devices to their normal position. A telephone communication is also established between the central station and the substation.

   In the event that the supervisor of the central statmon wishes to speak with the supervisor of the substation, the particular telephone manipulator assigned to this substation will be operated to produce a tag corresponding to the contact panel of the control switch. to the CCG group, by means of which a certain number of current pulses of acoustic frequency will be transmitted by the line circuit to actuate a corresponding switch of the substation and place it in the same relative position.



  In this position this switch closes circuits of the ringing telephone of the telephone, and as soon as the supervisor of the substation answers a signal is sent to the central station to call the attention of the supervisor, so that the two supervisors can then converge. If it is a supervisor of a sub-statiion who wishes

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 talk to the supervisor of the central station., he will pick up his receiver as. in normal telephone practice, so that a signal will be transmitted to the central station and cause the central indicator board CIB to light up the signal lamp of the telephone assigned to that particular substation, at the same time emitting an acoustic signal.

   On hearing the signal (called you the central station supervisor will then insert its plug into the respective jack belonging to the calling line and the two supervisors can then converse. Removing the jack plug and hanging up the receiver at the substation then determines the return of all established connections to their normal position.



   The foregoing particularities and others not specially mentioned will be brought to light by the following description of two embodiments of the object of the invention, namely g firstly the signaling by means of currents of acoustic frequencies. on a circuit comprising telephone repeaters, and secondly signaling by means of a direct current on a metal circuit.



   To come then specifically to the assembled circuit, it will be assumed that one wishes to obtain the reading of the device N 2 of the substation o For this purpose, the key of the device N 2, indicated in part upper part of fig. 13, is' maneuvered and with its set of left-hand springs the circuit is established according to the positive armature rp2, fig. 12, the armature tcl, the conductor 10, the normal contacts to the spring sets of the manipulators

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 EMI12.1
 TLH telegraphs fig. 13, the normal spring contacts of the CHK control manipulator, the normal contacts of the springs of the TLK total load button.
 EMI12.2
 ncrmatïx contacts of the springs to other buttons, appear, 3, the appliance button does not operate 2.

   the driver 11, the contact pad 9 which is engaged the contact lever 1a of the central selector switch CSS. On the side of the right spring set connected with the counter button 2, fig. 13, the following circuit is established to operate relays X and U of FIG. 12: the positive springs actuated on key 2, the normal contacts of the springs on the telephone key TPK, the
 EMI12.3
 switch 12, the atmospheres such as sl, ± Q.1, nk3, the first pin of the contact table of the central selector switch CSS and the contact arm a at said switch, the lower winding of relay X at the negative of the switch.
 EMI12.4
 battery, and, parallel to this cii-cuît, by the remaining armature vl and the winding to the reiais U to the negative ae the battery.
 EMI12.5
 



  By attracting its uiuutuèe The relay prepares to its armature xl an as garas circuit for its upper locking winding, to armature x2 (fig. 14) it prepares a. circuit for RF relay and to. the armature x3 ('ig. 12) it prepares a point of the circuit for the shift relay and, to the armature n4, it connects: the position ,, by the conductor 13, the winding of the relay LF of the team -
 EMI12.6
 acoustic frequency ment tfigo 11) to the negative of the battery.



   It should be noted that the acoustic frequency equipment located at the substation shown

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 to figs 6 and 7, and the acoustic frequency equipment
 EMI13.1
 ànstalié at the central station, shown in figo 10 and 11 include in the first place a device capable of eDgeDUr8r alternating currents having frequencies of the order of 300 periods, 60U periods and 1400 periods.



  The current of 300 periods is brought by the conductors
 EMI13.2
 14 and I6 the currents of 6000periods by the conductors 27 and 28 at 75? 6p while the 1400period coarant is brought by the conductors 34, 35 at 60 and 61, these currents being brought to the power cable 16,17 by means of filtering circuits intended to leave
 EMI13.3
 pass frequencies of Ota60U and 1400 periods, respectively, and the receiver circuits comprising thermo-conical valve amplifiers, capable of amplifying the currents received in a manner sufficient to actuate ordinary telephone relays which are not
 EMI13.4
 interposed in the anode circuit of the valve; ecticatrice.

   The supply conductors of the filters are also normally short-circuited by the contacts of the rails I MF and αiEg which are energized only when it is desired to transmit the respective frequency to which they are assigned. Under these conditions the amplifying valves
 EMI13.5
 corresponding trices will naturally not be zero, lïuméeo Lo ± squil is to receive current frequencies all the relays will be in their normal position and the valves will be on so that the received frequency will find its way to through the desired filter and amplifying valve equipment, to actuate the desired relay in the anode circuit of the

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 last valve and thus give the desired signal.

   After this description of the general operation of the electro-acoustic equipment, we will now return to the detailed operation of the circuits.



   Returning to the axcitation of. '? LF relay by the circuit traced above, it will be noted, referring to fig. 10, that at 1 armature 1f1 the short circuit is greater. awarded to conductors 14 and 15, through which a current of frequency 300 is supplied, while at armatures 1f2, 1f3 and 1f4 the power supply circuit of receiving transformers XF1, XF2, and XF3 (fig. 11) is switched on. short circuit; and at armatures 1f5 (fig, 11) the pulse circuits are open to certain relays of the control equipment of the central station which will be described later.



   Since the short circuit is now eliminated on the incoming conductors for frequency 300, a current of this frequency will be transmitted through the line circuit to the substation, through the designated low frequency filter. by 360 LP and the secondary winding of the hybrid transformer XF4, hence. the current is induced in the primary winding and is transmitted by the line conductors 16 and 17, which can include one or more translators - not shown - to the primary winding of a hybrid transformer similar to 1XF4 (fig. 6) beyond the substation.

   By induction, the circuit is therefore induced in the secondary winding of transformer IXF4, through the low frequency filter 360 LP at the primary winding of receiving transformer IXF1. Here a current

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 is again induced in the secondary winding of the
 EMI15.1
 IPi transformer and this current passes through 1P intexm.eaia- ry of the receiver valve8 and of the rectifier valve 19 to the telephone relay IRL which is connected with the positive of the source deviates voltage via
 EMI15.2
 to driver '20,

   Returning now to the acoustic frequency equipment of the central statson represented in ig0 10 and 11 we notice that while the frequency current
 EMI15.3
 300 passes to the 16t line through the 360 LP low frequency filter, ie the 400 HP high frequency filter is intended to prevent the frequency current
 EMI15.4
 300 to enter the circuits derived in J.teSIlU4ilJI! .If are inserted the / filters BCO LP and 900 Hop of eme only in the acoustic frequency equipment of the sub-
 EMI15.5
 station shown in figo 6 and 7, the received frequency is stopped by another filter 400 HP qail'emp3 prevent to engage aans a wrong path.

   It should be added that
 EMI15.6
 the amplifying filaments of the 300-period receiver valves are permanently on. The circuit of the filaments of valves 18 and 19 (fig 10 and iL) can be traced as follows: from the negative to the winding of the relay SL with relatively low resistance by the filaments of the
 EMI15.7
 valves in sÚ'ieb to the positive of the battery by means of the reaction coil OL .. The relay s 8L is energized on this circuit and opens, at its armature 81, the
 EMI15.8
 warning relay circuit 80 with different action, while in its armature 'SI- it opens a point of the circuit to a signal lamp assigned speciaieaent to the valves

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 receivers of frequency 300.

   It is easy to understand
 EMI16.1
 that in case 0 'a filament would come to n2unquer, the rebate Si will be triggered and thus allow the excitation of the reset SO to connect the positive of 1 battery via the intermediate to 1 1 tsol armature; de i's, rmdtu.ce 'Si2, .Let lamp individual signal.

   At the SO2 reinforcement is loose rope. The posi-
 EMI16.2
 tif of the battery by the driver 2l so as to close the circuit on a common ringing call thus signaling to the supervisor that the said valve circuit
 EMI16.3
 is disturbed,: From this leak, the positive current in the battery is extended to the SO3 armature and comes to ignite the
 EMI16.4
 valve filaments of the reception circuits of the frequencies 600, and 1400, so that the respective series relays SM and 8H can be used to keep the circuits of the armatures xài and sli2 open. Individual alarm lamps assigned to the 600 and 1100 frequency receiver valves respectively.



   Likewise, if the filaments of the valves of frequency 600 and 1400 should fail, the connection
 EMI16.5
 from the positive battery to the conductor 22 resulting from the control device under normal conditions, will cause the SO relay to be energized by one or the other
 EMI16.6
 frames ge or ahi, and then read. Common alarm bell will sound again and the appropriate alarm lamp will light up to indicate 1 Tdvdi: ï o.



  Returning now to the energization of relay II of the anode circuit of the receiving valve 19 of frequency 300 at the substation (fig. 7), the following circuit is established: from the positive armature llf5 through l 'armature sorts the conductor 23, the winding of the

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 EMI17.1
 stiffened 10 (rigo 4) to negative ,, Relay 10 is energized on this circuit and connects, to the armature I01 (figo4) the posi- tive of the battery and the 24p conductor establishing a soured (figo 7) a parallel circuit to switch on the filaments of the valves receptioes of frequencies 600 and
 EMI17.2
 1400 of The substation The equipment ue acoustic frequency
 EMI17.3
 tick ready to receive impulses which will be described further away, branch to armature 10 (figo 4)

   the positive pole of the battery on conductor 25, and the relay
 EMI17.4
 ITO (figo 6) on the negative '(. The excitation of this relay
 EMI17.5
 new armatures ltol and itou points to the telephone circuit which will be explained later)., to armature 103 (figo 4enn point is open in the circuit of relay 1LF (fig- 7) and to armature 104 (figo 3) a point is closed in the circuit of the winding:

  tri # Ulr du relaas col Let us now return to the relay excitaticndn U of the equipment of! c ImJlé1llli8 of the central station (rig. 12) it will be noted that at 1 xtuxe ul unoint is prepared in the circuit of rerais V (figo 12) 0 while at the A2 armature the circuit of the motor magnet OMIS of the OBS selector switch of the central station is closed and gi r at the armature u3 a point of the MF relay circuit is prepared (migo il) and qu 'with us frame
 EMI17.6
 a circuit is closed for the VA relay (figo 11) 'which is
 EMI17.7
 > When energized] By attracting the armature to the relay
 EMI17.8
 VA closes the relay circuit V which is also energized and opens the relay guard circuit to the armature vl
 EMI17.9
 U, and connects ,, to 1 P, rndture v2 (figo 4)

   the positive of the battery through the closed armature sw2

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 and the MGM motor magnet winding of the switch
 EMI18.1
 connector of the MQS device to the negative * of the battery.



  The magnet is then energized and is ready to advance on the contact key set following the control levers.
 EMI18.2
 contact li to 3b which it activates. Triggering of the U relay demagnetizes the CSS magnet to its toar and again advances the contact levers 1a to 4a to the second set of keys.
 EMI18.3
 contacts and since the relay U opens the circuit of the V relay, this last relay goes aecienchor and will open in its turn the circuit of the magnet C11 to advance the contact arms to the MCS switch until the second
 EMI18.4
 contact key set.

   The action of relays U, V, and VA will move the contact levers to the CSS switch going around the contact keys in search of contact 9 which had been identified by the switch.
 EMI18.5
 manipulator of the devices 2, while under the action of the relay V the MES switch follows this movement step by step.

   
 EMI18.6
 From the description which proceeds it will be understood that the progressive advance of the switches
 EMI18.7
 OSS and U03 will be during this relatively slow period, since el-LH depends on the tripping period of these three delayed action relays U, V and VA) this device has been specially designed to leave the valves of the substation frequencies 600 and 1400 sufficient time to reach their temperature
 EMI18.8
 appropriate before receiving impulses.

   When contact huas 4a of the CSS switch then meets the first contacts which are connected in multiple on the board, the tranSmiSSion! of pulses at the sub-

  <Desc / Clms Page number 19>

 station will start and it will be noticed that under these conditions the VA relay will be locked by its lower winding and neutralized or even with respect to the reciprocal action circuit, thus activating the allure of the impulses. next excitation at relay U, the circuit indicated below, will be closed in addition to those already mentioned: from positive to contact lever 4a quin is now engaged on the contacts connected in multiple, by the armature u3, the armature sw3, the conductor 26, 'winding of the remake MF -fig.11- to the negative of the battery.

   By attracting its ar @ atures, -The MF relay eliminates at its mf1 armature (fig.IO) the short-circuit of the incoming current of frequency 600 through conductors 27 and 28, so that a pulse of this nature can then be transmitted through the low / frequency filter 900 LP, and the filter of the other frequency 400 HP to the secondary winding of the XF4 hybrid transformer and is fed into the secondary winding on the line circuit, formed by the conductors 16 and 17 (fig.

   7 and 6) of the primary winding of transformer IXF4 of the acoustic frequency equipment of the substation. The circuit is therefore extended by induction up to the secondary winding of the IXF4 transformer and from there via the high frequency filter 400 HP and the low frequency filter 900 LP to. The primary winding of the receiving transformer IXF2 where. a current is induced in the secondary winding which is transmitted through the intermediary of the amplifying valve 29 and the rectifying valve 30 of the frequency 60u to the IBM relay, of which in a word adds

  <Desc / Clms Page number 20>

 
 EMI20.1
 

  bearing is connected by Il intoxw (liai.t'6 of conductor 31 to the positive of the high voltage source. As a result of the device of the filters mentioned above, the frequency 600 is channeled here also on the right track. attracting its armature IrmimH ze.Lai lim extends the positive of the battery through the I'1lli.; J.tllre .f.f'5, the armature lrml, the conductor 32, and the winding of the L impulse link (i'ig. 4) to the negative of the battery.

   The excitation of relay L on.
1
 EMI20.2
 circuit described, closes at armature 1 (fig. 2) uxbircuit for relay G., and closes at armat; u.a 1 (fig. 2) the circuit for motor magnet SSIL of COIDilll1tateUI 'selector 3
 EMI20.3
 SSS of the substation, and prepares for the reinforcements 1. and -4 1 (ftg. 1) polarized relay circuit points for the telegraphic equipment at the substation shown in fig. 6, which will be described later.



   Coming back to the present time, back to the team-
 EMI20.4
 control unit from the central station (fig. 13), it can be seen that when relay U is triggered, the CSS and MOS switches will plub, and that in addition the locking circuit passing through the conductor 26 to the MF relay of the acoustic frequency equipment
 EMI20.5
 of the central station (fig.lla is open, so that this relay releases its armetzure mfl (fig. 10) to short-circuit again, the supply of fre-
 EMI20.6
 quence 600 which, we will remember, had been extended by conductors 27 and 28.

   Under these conditions, the
 EMI20.7
 IBM relay of the receiver circuit of frequency 60 (1, mounted at fig. 7, which is located at the substation, will also be triggered and will in turn activate the relay.

  <Desc / Clms Page number 21>

 
 EMI21.1
 L (fig. 4) to open the SSM magnet motor circuit (fig. 2), so that the contact levers of the substation SSS selector switch will advance one step to the second set of pads. of contact.

   In this way the SSS selector switch of the substation is made to follow the movement of the selector switch.
 EMI21.2
 such as CSS deka central statbn until reaching a determined position It should also be noted that during the period of progressive automatic advance of the
 EMI21.3
 SSS switch, the circuit to relay G (t'igo2) is intermittently closed and since it is provided with a copper weight, this relay is capable of retaining these reinforcements penuant all the aureo of the;

   pulse period, and
1
 EMI21.4
 keeps open to its core, (figo2), the return circuit of the switch S while at the armature ± 2 (fig. 3) it opens a point of the upper hoarseness circuit of relay 00 (figo) D and at <: Lmature ", 4 a point of the circuit of relay 1 (figo) y but closes, to the armature at / (figo 3 the circuit of a similar delayed action glow Go By attracting its armature EË1 (fig.3) the GA relay prepares a point in the winding circuit
 EMI21.5
 top of relay C09 and opens, at armature g a3 (fig 2) a further point of the circuit as a return of the SSS switch, but fei-map at armature Ka5 a point of the circuit of relay K (fig * 2) * In the the control equipment of the central station (freeze 12) when the contact lever la of the cO: rrJ! J1! 1tl :;

  The selector switch of the central station meets the pin marked 9 which corresponds to the manipulator of the devices 2, the positive of the battery connected with the said pin -sa is

  <Desc / Clms Page number 22>

 find it connected via the upper winding of the relay SW, to the negative of the battery and this shines thus excited, closes a circuit to its armature sw1
 EMI22.1
 guard going through its winding to a lower locking device to the earth, in parallel with the relay 1.is 1f.

   and opens, on the armature sw2 (fig. 14) the circuit which energizes intermittently The magnet of the comrmtateai <iY0S connecting the devices, so that the contact levers are located
 EMI22.2
 stopped in this position, in layuelte circuits are prepared by means of the contact levers 2b and 3b to actuate the mechanical measuring device on which
 EMI22.3
 is connected to manipulator 2 of the devices. A ow3 armature is closed by a circuit passing through the conduc-. their 33 to activate the HF relay (fig. 11) of the acoustic frequency equipment of the central station while at the rest contacts of the armature sw3 the circuit of the MF relay (fig, it) is , open.

   Swaying
 EMI22.4
 of the MF relay short-circuits the feed conductor of the frequency 600, so that the LRM relay of the equipment
 EMI22.5
 of the substation's acoustic frequency (fig. i) is also triggered and opens the circuit of impulse relay I (fig. 4), so that these contact levers
 EMI22.6
 of the SSS selector switch of the substation are immobilized in the same reia-cive position as those of the MCS connector name switch of the meters (fig. 14) of the central station.

   By attracting its armatures, the HF relay (fig.ll) removes the short-circuit of the conductor of the frequency 1400 connected to the conductors 34 and 35 so that a pulse of this frequency will be transmitted by the intermediary to the high frequency filter 900 HP and

  <Desc / Clms Page number 23>

 400 HP high frequency filter at 1 secondary winding
 EMI23.1
 from the Bzz transformer and from 1.9 by induction, to the line circuit x'orme paries conductors 16 and 17 to the primary winding uu trl: lntlt'or'J: J1tt ::: ur IXF4 (figo6) of the substation .



  Here the pulse of frequency 1400 is again inductively transmitted to the secondary winding at the tram
 EMI23.2
 trainer IXF4 via a high frequency filter 400 HP and to the high frequency filter 90u HP of the receiver transformer IXF3 1 and from there by the secondary winding of this transformer to the amplifying valve 36 and the rec-Gificutrice valve 37 of the i400 frequency to actuate the IRH shine, whose winding is connected by the i'intei mai <ire of conductor 38, to the positive pole of the high voltage source o By attracting its ammature lrh1. The IRH relay connects the positive of the battery via the conductor 39 to the AA relay (fig. <, 4) so that by 'attracting its
 EMI23.3
 garlic frame (fige2),

   this relay connects the positive of the battery via the contact lever 4c. and the pads connected in multiple, with the aim of maintaining the relay G when the relay I is triggered, as explained above, while at the abt2 (tig1) and a /:!. 3 armatures (fig. .2), -The AA relay prepares a circuit to actuate the lEP relays and the telegraph equipment (f'igo8) which, under these conditions, remains inactive. At 11rwtureaa4 (funny) the reltiis AA forms a circuit on the motor magnet SOM which is excited pre-axial to the advancement of the contact baas on to 3d of the control switch 'SCS (figol) of the substation.



   Returning back to the station equipment

  <Desc / Clms Page number 24>

 
 EMI24.1
 central (fig. 12) we see that the. OSS switch will continue its movement in the manner described above, and since the SW render is at this time locked
 EMI24.2
 in formoeul-ej position it will be. This time transmitted current pulses of the frequency of 1400 periods to the Line, so as to drive the AA relay of the sub-
 EMI24.3
 station to operate the sub-station control switch in synchronisms with the central station switch.

   When -The contact levers, 2௠and 4.of the usa switch (fig.12) then drop the pads connected in multiple to their contact board, the reciprocal action of the U and V relays will cease and
 EMI24.4
 contact arm of the comoatatear will be immobilized in ieai <.24th position and therefore established the following circuit; from the positive connects with the contact levers 4g through the 24th contact pad, the drawn armature x3 and the relay winding 'la to negative.

   In other fittings, the MIl relay connects; to the armature mrl (fig. 12) the positive of the battery on the conductor 22 to turn on the receiving valves of the frequencies 600 and 1400, as explained above, and the
 EMI24.5
 keep ready to receive pulses of this frequency from the substation equipment, while at 6It \ 1lat \ 1- res mr3 and mr4 (gig. bzz, the relay; C3 p: r :: bpaHl new points of the circuit of the control magnet of the mechanical counter; to the armature mr2 (fig. 14) is also prepared
 EMI24.6
 one of the central station's telegraphic equipment circuit which at this time is inactive.



  At the sou-ets.tion, the àëciencllemen.1 da.:::5relais
 EMI24.7
 H9 from the central station results in

  <Desc / Clms Page number 25>

 pulses of frequency 1400, so that the re-
 EMI25.1
 leave 1RH to the receiver circuit (figo4) of the acoustic frequency equipment of the substation will be triggered
 EMI25.2
 also and will in turn drop relay AA (fig, 4) so that the circuit on release G is open long enough to allow it to trip.

   By tripping, the relay G opens, at its armature 3 (f'ig3), the circuit ae keeps the relay GA and struggling with the delayed tripping period, a circuit is established from the
 EMI25.3
 positive *., at the rest armature g3 (fi g.3) by the armature attracted jga.1 the upper winding of relay 00., at the negative 'of the battery the relaib 00 is then energized and opens, at its o-rmature ± g1 tuig.2) a new point to the return circuit of the BBS switch, and closes at JThe armature co2 (i'igvi) a circuit for the relay Ho About the selector switch CSS ae -La central station that the multiple connection of the switchboard studs acting in combination with the contact lever 4a is arranged
 EMI25.4
 such a mania that it is invariably transmitted 17 impulses to it:

  Lppa # i.l. receiver of the substation and it is understood that according to the position of the reference mark on the table 1a which regulates the operation of the SW relay, that these 17 pulses will always be transmitted in two groups
 EMI25.5
 characterized by their different frequencies, namely the frequency of 600 and the frequency of 14000 In the particular case of the example described, it will be transmitted to ia
 EMI25.6
 substation two pulses of the frequency 60t, in order to place the contact arms of the SSS switch in their third position, while the other 15 pulses emitted by the CSS switch of the central station go

  <Desc / Clms Page number 26>

 
 EMI26.1
 be tma, nis6sâ the frequency of! -! eO; in the bd t place the SC8 control switch in its i6th position.

   By arranging the connections between the tables the. and 2 d of the SSS switches and its such that a circuit can be closed only when all of the 17 pulses distributed between the two switches have been received, an increase or decrease is found.
 EMI26.2
 tion of this number will prevent the continuation of the maneuver and will therefore make it impossible to connect the central station equipment with another device of the substation than that for which the switches of the substation have been set. .
 EMI26.3
 



  Let us suppose now that in the particular case described, the maneuvers for the circuits are enbrdre, the next circuit will be closed on the relay H (fig. 1), following the excitation of the CO relay: of the winding mdggtive of relay H by the .co3 armature the rsr4 armature, the contact lever 2d and the 16th pad of the board, the third contact pad of the board and the contact arm of the SSS switch to positive By attracting its armatures, the H relay prepares a large number of circuits among which the following are of more direct interest:

   on the h3 armature it prepares a guard circuit for the CO relay (fig. 3)
 EMI26.4
 to the armature h6 (fig, 2) a circuit for the delayed action rails D and K, and to the armature h7 (rig.l) it connects the positive of the battery by means of the contact lever 3d and the 16th contact pad of the
 EMI26.5
 to actuate relay S, and to armature hi the relay H establishes the following circuit of the contact arm
 EMI26.6
 positive 1ç and pin 3 of the SS switch (fig. 2), by

  <Desc / Clms Page number 27>

 
 EMI27.1
 the 1: I.J:

  'MatUJte attracted hJ1J) the driver 41 the DlS relay (fig. 5) to connect the desired Midworth dynamometer (which is not shown since its operation is known). It should also be noted that there can be three
 EMI27.2
 Mâdworth devices the conre zêons necessary for this purpose being established by energizing the special switching relays LYS, SSS or 3MS indicated in fig 5.



  Three ludwotth initiator devices LOE1, p MISS and @! W) 3 (: Vig, 6) are connected to the above dynamometers; to mix and act in synchronism with them.
In the example described the excitation of the IMS relay results in. to connect the first dynamometer
 EMI27.3
 Midworth and since the movable index of this instrument is coupled méeCJ.niqlle1Il3 nt with the movable index 42 of the MIDI instrument,

   the energization of the SA relay mentioned above will close a circuit to energize the field circuit 43 of the Midworth transmitting device in
 EMI27.4
 turned to the dotted rectangle and designated by MP.I1 should be noted that the field circuit 43 can be excited in different directions depending on whether the index 42 is applied
 EMI27.5
 on one or 1 paute contact of the fork l! 5o The detail of the circuit is as follows; from the positive to the armature attracted sa3 (fig * 2) by the conductor 44, the index 43 and the contact of the fork 45, the field winding of the motor 43 to the negative of the battery. The field magnet by attracting its armatures closes the circuit of the rotor of the motor 46 which can rotate in either direction depending on the direction of the field excitation.



   The motor moves the sliding contact 47 of the resistor in one direction or the other to adjust the color.

  <Desc / Clms Page number 28>

 of the coil actuating the movable fork 45 which supports the contacts, until equilibrium is reached and the index is suspended between the contacts and the motor circuit is opened as a result of linen-
 EMI28.1
 interruption of the field coil excitation.

   The coil 48 which controls the mobile type of the power receiver
 EMI28.2
 TMR sance represents framed by the lower dotted rectangle, is connected in series with the coil of the MIDI instrument mentioned above by the fol- lowing circuit: device to resistance, by the running contact of the device transmitter 3ia = ,. orth TuIRU, the winding of the coil of M1Dl, the conductor 49, the armature attracted sal (ig.2, the conductor 50, the winding of the coil 48 of the FRITZ receiver to negative ' of the bat-cerie.

   Since the two coils thus receive the same amount of current, the movable fork acting in combination with the coil 48 of the motor receiver will seek to
 EMI28.3
 take the same relative position as the coil of the MIDI device, so that one or the other of the fork contacts will be brought into contact with the index 51 following
 EMI28.4
 before there is an increase or decrease in the total current supplied. The mobile fork coming into contact
 EMI28.5
 of the index 51 fenha the circuit for the field coil 52 of the PWR receiver and the latter, attracting its armature closes the circuit of the rotor of the motor ue control 53.

   The motor moves the index until -equilibrium is reached and then the index is suspended between -the contacts of the fork. With the motor is coupled on the other hand a cam wheel 54 actuating the spring 55 to close the circuit of the relays D and K (ig.2) so as to

  <Desc / Clms Page number 29>

 
 EMI29.1
 transmits to the central station an appropriate number of pulses, as will be explained later, Assuming then that the buffer 56 fixed to the movable spring is fully engaged in the teeth of the cam wheel 54, have it spring closes the following circuit for relay K:

  the positive of the battery connects to the movable spring which is in contact with the spring below, by the conductor 57,
 EMI29.2
 hoarseness at relay K (fig. 2) p the armature attracted ho and by resistance YA to the negative cae the battery., Relay K is then energized and closes, at armature ll a guard circuit for Him-mSma1ma OUV8p to the armature k2 a point of the guard circuit of the relay Dg and prepares for 19 arrnature k3 (rigo4), a point of a circuit leading to the acoustic frequency equipment of the substation.

   When the flap 56 (Rod 5) then travels over the top of the wind, it determines the closing of the next circuit for the relay D; ufrom the positive of the battery connected to the movable spring pui is then in contact with the spring from above, via conductor 58, the coil of relay D
 EMI29.3
 (tig2) has j. attracted armature h6, and ra resistance Xl, to the negative of the battery.

   Being excited on the circuit which has just been described, the relay D prepares, at 1t1..L'm.atu.L'e, a station circuit for 1ui-mgme9 and opens. at armature d2 a guard circuit for eleii S Kp and during the period a delayed tripping ue the latter reiais the following circuit is established to perform the excitation
 EMI29.4
 of re.Laîs 1HF ae -The acoustic frequency equipment of the sub-station: on positive ue 1.battery by the h4 armature (fig. 4), by the k3, d3, rvà armatures, the conductor 58 and
 EMI29.5
 The winding at relay 1119 to negative fires the battery.

   In

  <Desc / Clms Page number 30>

 
 EMI30.1
 attracting its frame il1. the 1HF relay suspends the short-circuiting of conductors 60 and 61 eg. 6) of the current illumination of the frequency 1400, so that a
 EMI30.2
 pulse of this frequency is transmitted through the 900 HP high frequency filter and the 400 HP high frequency filter to the secondary winding of the IXIA transformer and, from there, by inauction to the line circuit to be transmitted after a new induction by the XF4 transformer to the acoustic frequency equipment at the central station.

   The pulse then passes through the high frequency filters 400 HP and 900 HP
 EMI30.3
 to the primary winding of the receiver transformer XP3et is amplified thereafter by induction by the amplifying valve 62 and rectified by the rectifier 63 for
 EMI30.4
 actuate the RH relay interposed in the anode circuit of this rectifier, so that its connections lead to the positive of the high voltage source, through the conductive water inlet 64. Being energized on the circuit described. The xe.ais RH closes to its rhl armature (f'ig.il) the following circuit, to the positive of .The battery, by the
 EMI30.5
 armatures 1'S, rhl, conductor 65, and the winding of relay 2B (fig.I4) to negate the battery.

   By energizing relay 2B on the circuit described, the positive of the battery is connected to the armature 2bl (rig. 14) through the armatures 2bl, lb2, mr2, the contact arm 2b and the contact 9 of the connector switch
 EMI30.6
 MCS for the meters, the conductor 66, and the winding of the magnet A of a .uecanique MMT meter with two
 EMI30.7
 directions, indicated in the upper dotted rectangle (fig.15), negative.

   The mechanical counter with two di-

  <Desc / Clms Page number 31>

 
 EMI31.1
 rections MU records in accordance with the number of pulses emitted by the equipment to the substation,
 EMI31.2
 justifies that this mecg.ue meter has two enciy'uetuge mechanisms of the type used in one-way automatic switches, these two mechanisms being couples with a common control wheel, driven in opposite directions, ae such so that the excitement of the magnet
 EMI31.3
 A will flee turn the index 67 in a direction above the dial, while the excitation of the magnet B will rotate the index in the opposite direction above the dial, so that the mechanical counter can follow the movement of the comp-
 EMI31.4
 corresponding to the substation in either direction,

   according to lanrtuxe aes received pulses.



  Examining now the movement of the Miawoorth apparatus at the substation in the opposite direction to that which has just been described, pn will notice that the indicator 42 of the Midworth apparatus ID1 atigo 5) will then be in contact with the other arm of the fork and that a circuit will thus be established for the excitation of the
 EMI31.5
 control 46 of the Midworth transmitter device in the reverse direction, in order to actuate the slide 47 in the direction opposite to that which has been described Lnoteuz 53 which controls the index of the PWR receiver will be actuated in the opposite direction to restore balance, and since the
 EMI31.6
 cam cheek 54 will be set in rotation, the relays K and V will be energized by the spring mechanism acting in combination with it.

   Regarding the cam mechanism, it should be noted that the arm 68 is mounted with hard friction on the shaft 69 of the cam 54, so that the rotation of the shaft in one direction will

  <Desc / Clms Page number 32>

 to abut the brus 68. against the stopper 70, while the rotation of said shaft in the opposite direction goes. abut the brus 69 against the stopper 71. Since in the case of the example considers the circular cam 54 rotates in the direction opposite to that of a watch hand, the arm
 EMI32.1
 68 will move towards the stopper z and ettaquertt the contact springs 72 which closes will close the following circuit; from the positive battery conductor 73 by winding the RV relay (fig. 2) to the negative of the battery.

   Relay RV is energized and transmits to its armature rv1 (fig. 4) the impulses emitted by relays K and D to conductor 74 and, consequently, to the winder.
 EMI32.2
 ment of the IMF relay ('ig.6). The excitation of this relay suspends the short-circuit of the conductors 75 and 76 (fig. 6) bringing the frequency 600, so as to transmit
 EMI32.3
 a pulse of this frequency via the low frequency filter 9Qü LP and the high frequency filter 400 HP to the secondary winding of a transformer ïXF4, from where the circuit is extended by induction on the line to excite the shine RM (Fig. II) of the central station in a way which has already been explained.

   In atti-
 EMI32.4
 owing its armature rml, the re.s BM connects through the intermediary of the positive conductor 77 to the battery IB (rig. 14) which, by attracting its ariatures, in turn connects to its armature Ibl (fig. le) the positive of the ba-ctery via its frame 2b2 and 1'armature mr4, the contact lever; 3b and the ninth pin on the contact panel, the conductor 78, the winding
 EMI32.5
 the magnet B of the MMT mechanical counter (fig. 15) and thus causes the inaex 67 to move in the opposite direction.



  1

  <Desc / Clms Page number 33>

 
 EMI33.1
 It should be noted that the system has
 EMI33.2
 several mechanical meters similar to MUT., with which, the wires connected in Êamltiple coming from the contact boards tob and 3b connector switch of the MCS meters are connected in a similar way to that shown in detail for the M1 counter (fig. 15).



  When reading the counter once finished, the 8U.L'veÍJ..Ld.nt abanuses Key 2 (Î'ig ± 3) to allow
 EMI33.3
 the return of the devices to their idle position. The posi-
 EMI33.4
 The battery is thus cut with the conductor 12 leading to the channel 12 and the re.tais x is on, pure against the positive of the battery which is connected with the conductor 10 (fig 12) is extended pure intermuîuil-e of bJ.'matUJ.'es È.2 and you at the ig.

   I9 and by r'méaiaire springs normally; f; 1e.I's in series which are part of the telegraphic unit TLH and springs nO.Lill1: t.Lement firm in sLt'Jl6 ttf't 'ected to the keys
 EMI33.5
 counters, and finally by the conductor 79 to the contacts connected in multiple acting in combination
 EMI33.6
 with bl'1: t have contact 3t da switch CSH (fig. 12) and, prr.ls.é.ement QU lever lb which is located in
 EMI33.7
 tact with the contacts connected to the array
 EMI33.8
 MCS (fig. I4); ue t8.L.18s01t8 that the aoix commutators are thus brought back to their original position by the self-interrupting circuits of the magnets which it is easy to follow.

   Other little; I relay X by opening to td'ültxId.Cf1 âL the gmue ciicait uu xelwis uRe and cut, to the armature bzz the positive 'ua the battery6 with conductor 13 polar aeciencher relay EF (f & g, .. Lt.) which thus cuts the frequency J30Q a 'with the abou-

  <Desc / Clms Page number 34>

 weaving to the acoustic frequency equipment of the, sub-
 EMI34.1
 station.

   By triggering the relay MR cuts to the armature mr1 the positive of the battery with the conductor 22 to extinguish the filaments of the receiving valves for the frequencies 600 and 1400 of the central station.
 EMI34.2
 It should be added that the disconnection of frequency 300 from the -Line circuit triggers the relay IR (fig. 7) of the substation. This in turn cuts off the positive of the battery with conductor 23 on the armature lr11 and thus opens the guard circuit of the LO relay (fig.

   4) which therefore declines, and
 EMI34.3
 cuts to the armature 10.1 the positive of the butce.cy with the conductor 24 to disconnect the circuit of the filaments of the receiving valves of the frequencies 600 and 1400 from the
 EMI34.4
 substation and opens, at the rebar 10 4 (fig. 3) the guard circuit of relay CG9, Following the triggering of the CO relay, the positive connection of the battery with the armature at rest knl (fig. 2) is extended by
 EMI34.5
 Intermediate between rma, tures el l and 2.

   to the contact arm Bc of the user, C -, "S which is engaged on one of the keys connected in multiple of its
1
 EMI34.6
 tabàead of contacts, while at the start use The armature ± is drawn a circuit passing through the conductor 80 to the contact arm ld of the switch 'SCS which at this moment is also engaged on the keys joined together in multiple.

   The SSS switches and its are therefore operated in this way so as to return their contact arms to their original position on a self-interrupting circuit which is easy to trace.
 EMI34.7
 While he is questioning the receiver By

  <Desc / Clms Page number 35>

   (fig. 5), 1 it sexa useful of decrias which is known under the designation of total load device, by means of which it is possible for the supervisor of the central station to obtain a reading of the total load of the any of the substations,

     by pressing a special key provided for this purpose. This key is mounted together with the meter keys on the indicator panel and is designated by TLK (figoI3) and the selection process in this case is similar to that described for a call concerning a measuring device.



   The equipment for the device for reading the total load installed in the substation is found in fig. 5, in the dotted rectangle TLM and essentially comprises a counter 81 connected in series with a variable resistance device 82 which can be adjusted by hand, to show on the counter an indication corresponding to the sum of the flow rates of the different meters energy installed at the substation. The circuit of this manually operated indicator meter is retort follows * from the positive of the hatterie by the variable resistance device 82, the coil to the meter 81, the conductor 83, the armature Sdl and the resistor YE to the negative of the battery. .

   From time to time the supervisor at the substation will adjust this hand meter so that it shows the indication of the total load existing at that time so that the supervisor of the central station will always be able to realize the approximate size of the total load.



   To join now to the control equipment of the central station (fig. 13), the maneuver, by the

  <Desc / Clms Page number 36>

 TLK full load key monitor extends, by means of the right spring set, the connection to the battery positive by the driver 12 to relay X to determine the rotation of the selector switch in the case of the station central and establishes, by the set of springs on the left, a locating potential at the 14th contact pad on which the contact brusque is engaged.

   This circuit which has just been described will have the result of transmitting seven current pulses of the frequency 600 to the equipment of the substation and thus bringing the selector switch SSS (fig. ) to its 8th position.



  The 10 pulses which remain will then be transmitted, as a result of the excitation of the relay SW, at the frequency 1400, and of this dear the switch ses (fig. 1) will be brought to its 11th position, in which it determines the excitation of the HB relay in a manner similar to that already described previously; on the other hand, a circuit is formed from the positive to the armature h7 (fig. 1) by the contact lever 3d and the 10th contact pad of its board, and by the winding of the relay SD to the negative ae the battery.

   The SD relay being thus energized, connect by means of its attracted armature sd1 (fig. 2) the counter indicating the total charge 81 (fig. 5) in series with the receiver on the following circuit, from the negative of the battery through the coil motor 48 of the PWR motor receiver (fig.5), the driver 50, 11 pulls 5dl (fig.2), the driver 83, the winding of the counter 81 and through the adjustable resistor 82 to the positive of the battery. Since the PWR motor receiver coil is now coupled in series with the counter coil

  <Desc / Clms Page number 37>

 indicator 81,

   the two will receive the same quantity of current and the motor-driven receiver will tend to assume the same relative position as the index to the indicating meter. From this rut it will be transmitted therefore,
 EMI37.1
 by relays 1 and D, i ipuisions in the manner described above to the statio4centrule to actuate the mechanical total load meter there, which is similar to that designated by tI; v1T (rigoI5) and is connected by a analogously with the connector switch pads for meters 1, OS.

   Once the reading is complete, -Recalling the TLK full load button to normal position (fig. 13) will determine in the manner already described. <B the return of all the devices to their normal position.
 EMI37.2
 After this presentation of the method for the selection of the meters at the substation and for obtaining their reading, a description of the components will now be given.
 EMI37.3
 binisons of circuits by means of qoeiLex the position of circuit breakers at the substation will be automatically announced to the central station as soon as a change occurs in their position.



     A. Fig. 9 is shown a typical relay equipment in combination with a circuit breaker designated by
 EMI37.4
 ILG, tiiniji that a relay equipment is combined with a branch change switch, denoted by 32LG and from which connections are made to the contact panels of the circuit breaker and the branch change switch (fig. 4).

   It goes without saying, of course, that the system will include many other relay equipment for other switches and branch change switches, and although these are not shown in

  <Desc / Clms Page number 38>

 
 EMI38.1
 Anyway, the indications 1'oul! nias sl1fr'i.L \ J1t to understand the üoëtiPxe of the circuits,
 EMI38.2
 The switch equipment designated by ILG
 EMI38.3
 Compremd two coils, namely a closing coil, '' and a release coil b, a.ont in first is intended to lock Itarma.tureu means a.'unlock
 EMI38.4
 mechanically while the switch is closed, while
 EMI38.5
 ais that the excitation of ra secome, -When J. 1 intC'L'J:

  switch
 EMI38.6
 triggers, is used to lift the mechanical lock to ae
 EMI38.7
 allow the frame to <. resume 8: <:, normal position.



  Assuming then that the switch r'espectii 'tlgiss (: 1, nt in combination with ILG is placed dn8 in the closed position j the contact springs coraGspona, nts 8 & which are mechanically connected to the switch are energized and brought to their position of fi ozmetuxe de ferle
 EMI38.8
 so that the following circuit is established the armature
 EMI38.9
 re positive â (fig. 3) PU ± - conductor 85, the springs normally closed on the test button, ti (fig.9), the common conductor connected to all the rmutures operating with circuit breakers and cam. ruta-teurs ae change of connection to Iltl.rmt! .tuè attracted 8, pure The winding of the excitation coil has some heat IDGJ the resdoi, ts normally the ermes ae L'o.rJ.Th: J. tlu'e from .Lt- ;! said coil, the common conductor 86, and L, 6111'OU.Lein6nt aureiais âs (fig.



  3) to the negative of the battery. This circuit excites the coil and the .eidis OS, read said coil connected to its upper armature,. The positive of the battery pa ± liintermect.e, i re of the conductor 8 to locate the corresponding contact pad. , nt to the switch arm 3r.BT:S (fig.



  4), while at its 1: I. rmtiture lower- la, coil has
 EMI38.10
 

  <Desc / Clms Page number 39>

   prepare a circuit for coil b 9 by simultaneously opening its own primitive excitation circuit; so that the reinforcements are then held in their
 EMI39.1
 position attracted by means of the mechanical ratchet of which it is pttrio above The coils a and CS are moreover provided with copper weights in order to allow the remakes to perform their full stroke without
 EMI39.2
 c.Lt4quer, since the excitation circuit comprises, as will be seen, a rest contact acting in combination with the coil a.

   By attracting its frame
 EMI39.3
 osi (t'ig) 9 le gluis 65 raccorae The positive of .L /: 1. battery by -intermediate aes pads connected in multiple and to the contact arm 4f, and by the winding to the relay
 EMI39.4
 RSR u negutir de la bdtzerieo The BSR relay then attracts its light structure rsri and thus closes a circuit ae garas pOl1.1: itself, iXldepend1t71Qnt of the relay #
Suppose now that a reading of a counter is in progress at the same time the priority must be invaded.
 EMI39.5
 It should certainly be reserved for the inication of the switches. It is therefore understood under these conditions that the question of the counters must be put aside and that would be in the following way:

   
 EMI39.6
 Since -The J.'sL!: I.isR3R is present locked at 11 titè: Jt has' excittionD the circuit of g /: 1..rè.e of relay H is open at .The armature rsr4 (figol) ue so that this relay trips, held that at 1 'd $' m., ture xsr5 (fig. 3) the KN relay is energized afterwards. The positive of the battery via the armature 104.

   Relay H in
 EMI39.7
 triggering cotip the equipment of the Midworth meter with the commtl.nae group; tl: J.lldi1 as the excitation

  <Desc / Clms Page number 40>

 
 EMI40.1
 of the EN relay maintains ta <t'ig.2) the return circuit of the open SSS and SCS switches (fig.l) and connects, to its kn2 and kn3 reinforcements (fig.4) the posi-
 EMI40.2
 tif 'from the battery via the contacts 74 and 59 to the IMF and IHF relay of the acoustic frequency equipment of the. sos-station ('ig.6). Being thus provided, these relays transmit a pulse of the frequency 600 and one of the frequency 1400 through the line to the acoustic frequency equipment of the central station.

   Although these two frequencies are superimposed on each other, the high and low frequency filters of the two acoustic frequency equipment are arranged in such a way that they channel these frequencies each into its own channel to make them perform the same. excitation of the RM and RH relays in fig.ll. The excitation of these relays determines the excitation of relays 1B and 2B (fig. I4) on a circuit traced already above and since under these conditions both relays are energized
 EMI40.3
 simuLts, however, the circuit leading to the mechanical counters and coming from the contact boards of the MOUS cozmatmver is cut and the following circuit is closed for the NK relay: from positive to armuture 2bl (fig.I4) by the arma- tune lb2, conductor 88, the activation of the NE relay to negative 'of the battery.



   This excitation of the NK relay closes you, with the nkl and nk3 armatures, a circuit (the alternative guard for the
 EMI40.4
 shine ME (fig. 12) and open, with the normally closed contacts of the last side a! E <nature of the relay X guard circuit which is thus triggered.

   In itself, the relay repairs the positive of the X4 armature. bat-caries

  <Desc / Clms Page number 41>

 and driver 13 and triggered the LF raids of the station's acoustic frequency equipment
 EMI41.1
 cent.:r.'le, q9I! 1: in turn cuts the frequency 300 deflo ;; 1 line leading to the acoustic frequency equipment of the substation, so that the IRL glow of this equipment will trigger also and will trigger
 EMI41.2
 in turn the L-e-Lais Lao of LI: 1 i'ig. 4.

   Following the release of J.'ell: 1Ís Z09 the circuit of the filuments of the receptor vulvae for the fre nonces 60G and 1400 is open to the tirml: 1tu: r: e lol, and to .l ' l ;; 1rml: 1tl1l'e 104 (fig.3) is open the ae girae circuit of the KNo relay When triggered this last reied-s closes to the armature knl (freezes) the circuit of t # turn of the SSS comiuututeuzs and its' fig. 1), while the kn2 and kn3 armatures are also triggered the IMF and IHF reset of the acoustic frequency equipment.
 EMI41.3
 tick of the substation to remove the, frequency 600 and iu. frequency 1400 on to. Line, in order to make declining they reictid co-responding BM and RH üe the acoustic frequency equipment of the central station.



   In this way the guard circuit of the relays
 EMI41.4
 18 and 2B (rig.I4) is opened so that these relays are triggered and open the guard circuit of the relay.
 EMI41.5
 ioii NK <Triggering of the NK relay triggers the Mu relay and it separates, at l. 11 :: I..r.'l11l: 1tu.r: e mrip the battery positive with the conductor 22 to extinguish the filaments of the receiving valves of the frequencies 600
 EMI41.6
 and 1400, and opens the circuit of the mechanical meter to the mr3 and mr4 fittings (i'ig 14).
 EMI41.7
 



  On reaching its primitive position, the selector switch SSS ue ia 80Us-stê; l.tion, the circuit

  <Desc / Clms Page number 42>

 1
 EMI42.1
 next; from the positive to the matures col, a and g = i2 (fig. 2) by the contact arm 3c and the first or
 EMI42.2
 its contact table, the armature lçn, the conductor 89, i. '; ms.ture rsr2 (fig. 2), the pads connected in mmltipie acting in combination with the contact arms 2r and 6f of the switch BTS e 1 & îaimature el , The conductor 90 and the winding of relay F (t'ig, 3) to. drums.

   By attracting its armature tl relay F closes a circuit of .celë :: Js E which in turn attracts its armatures and opens, at .L 1 ur: mature el (f'ig.4) , the guard circuit of relay F and, to the armature e3, it controls the position of the battery by the intermediary of the contact lever bzz and the peemièrrplot of its contact board, to the motor magnet SPM of the substation for the central pulse switch SPC.



   The combined action of relays E and F will have
 EMI42.3
 as a result an intermittent excitation of electro-2 :: motor timer SPM which will advance the contact levers coupled 1 to 4 by rotating them on the contact pads, and during the first part of this period of automatic rotation. which has no effect on the issue
 EMI42.4
 line, the following circuit is established for: making the connection of the filament circuit to the recoptBme'ea valves of the reqaencus 600 and 1400 of the central station :: tLe) t from the positive to the conductor 89 as it was drawn previously, by the armature: r: sr2-, the armor 103, the conductor 91, the winding read è2 ::

  tis 11F of the acoustic frequency equipment and the negative of the battery. By attracting its armatures, the LLF relay transmits a pulse of frequency 300 to '-The line for egfec-

  <Desc / Clms Page number 43>

 
 EMI43.1
 kill the excitation of the relay BOL (fig ,,. L.L) of the acoustic frequency equipment of the central station, and the latter in turn connects the positive of the. battery via at concluded-
 EMI43.2
 tor 92 to activate the relay (igol4) By attracting its armatures, the relay S connects to the armatu;

  e s3 (freeze 12), the positive of the battery via the conductor 22 to ignite the filaments of the recep-
 EMI43.3
 at frequencies 600 and I4JU and branch to armature jEt2 (fig.I4) ie positive to the battery via the conauctearu93 to actuate the TO cut-off relay of the telephone (figol0) D ae so that the frequencies received will not be transmitted to the telephone circuit.



   To return now to the control equipment of the sub-statmon (fig. 4), it will be noted that when the contact levers of the SPC switch reach their 10th position, they close the following circuit From the positive connected to the lever ae contact 1f and to the first contact pad to the BTS switch (fig. 4), The conductor 94, ie contact lever 3rd and the 10th contact pad
 EMI43.4
 to the SPC switch, llmature c and conductor 74 to actuate the LMF relay (figo6)

  o A pulse of frequency 600 is then transmitted on the line to ac-
 EMI43.5
 the RICE relay of the equipment to the acoustic frequency of the central station (fig. 11) which in turn
 EMI43.6
 connect ioboaitif pet through conductor 77 to the winding of relay 1B -tfigoI4). Being thus excited, the reiais 1B closes a circuit starting from the positive 'to its armature attracted Ibl (figo 14) by the arma, ture 2b2 at rest, the armature mi-4 at the i-epos llenl'OU1.egent of the reiais Z and au

  <Desc / Clms Page number 44>

 battery negative.

   The Z relay is then energized and
 EMI44.1
 the weapon, to its armature al (ig.12) a return circuit for the CSS and MCS switches and also for the mechanical counter when the MCS switch reaches its rest position,
 EMI44.2
 ,,. its armature s3 (fi g.I) the relay Z connects the positive of the battery via the conductor 95 to the winding of the GBM motor magnet. acting pn combination with switch and switch disconnected
 EMI44.3
 ment GET from the central station (fi g. 15).

   To armature z4 (fig. I4i, the positive 'is connected via conductor 96 to switch on the PIIL signal iaiipe (end 15) to announce that a change in position of a switch has been a connection will be announced, while at the z5 armature (fig. 14) the return circuit of the GBT switch (fig. 15) is open.



   At the substation control unit (fig. 3), when the contact levers of the SPC switch reach their 17th position, the switch
 EMI44.4
 s8u ± .L7ête, 10 circuit u 'excitaci on uc the magnet being cut at contact arm 2e, while at contact arm 3e,
 EMI44.5
 one circuit of relay I2 (fig. 6) is open. The relay, when triggered, cuts frequency 600 from the lines and triggers the RM relay of the station.
 EMI44.6
 cntrs.lej which in turn triggers the IB relay. This latter relay then ogvre the circuit of the motor magnet GBM (fig. I5), so that the switch CET advances its contact levers on the second set of contact pads.

   Note that the Z relay is
 EMI44.7
 meintenu you closed thanks to its copper maselotL which surrounds

  <Desc / Clms Page number 45>

 its core. In the 17th position of the SPC switch (fig.



  3à) the contact lever 2e is in contact with
 EMI45.1
 the motor magnet BTIi to the switch BTS ('igo4) and after the following excitation and triggering of the relay The contact arms of the switch BTS will be advanced to the second set of contact pads of their table.

   In
 EMI45.2
 the second posicion to the switch BTSy the RSR relay is triggered but the reciprocal circuit of the reiais E and F is maintained by the intermediary of the contact lever 2f and the common multiple of their contact boards, so that the The contact levers of the BTS switch will be advanced automatically step by step by going around the pads of their panels., Although in fig. 9, only two sets of types of switch relays are represented.
 EMI45.3
 connection change leave, designated respectively by ILG and 32 LG, it should be noted that it could J an have up to 49, connected with the respective contact pads of the contact board of the BTS switch acting from a
 EMI45.4
 a blog way to that described in combination with the contact levers 3f and 7f.



   Consequently as the switch.-.
 EMI45.5
 



  BTS would circulate its contact levers on the pads of its table, the levers ae contact 3r and 71 'aOlÍ! Come to encounter either an interruption of the circuit or on the contrary a connection with the positive of the battery, followed the position. respective relays acting in combination
 EMI45.6
 , with the switches and the branch change switches with which they are connected o In the case of this example, where 1. ' Ínte.I. ', L'UpreUl' is supposed t'srmt

  <Desc / Clms Page number 46>

 the second contact block acting in combination
 EMI46.1
 with -The contact arm 3 & is aecouectc: and it will be noted that following the excitation with the rolais, the following circuit is established:

   afrom the positive connected to the contact arm 11 ', by the cLeuxi, -Ùric4 contact pad and the t .. l ..cs, ru.tu: cos 3 l the contacts connected in Multiple, ios armatures! iL, -2 the conductor 74th the winding at res is 14 ', (' ig, 6) and at negative 11: 1. drums. In this way a new pulse of the frequency 600 is transmitted to the line to excite the RM shine of the central station's acoustic-frequency equipment:, which, in turn,
 EMI46.2
 energizes rerais 1B to keep relay Z energized and again close a circuit on the motor magnet CBT of the switch CBT (fig. 15).

   In its ar.-nature lb3 (fig. 14) the relay lE connects the positive to the negative of the battery by the intermediary of the conductor 97, the contact lever 3g, and the second contact piece, the winding of the coil.! lb.nde ..!:!:. of the worm relay J. OUiJ.Lc., mechanical ge! LR (i'ig.15) / Following the release of the relay
E, the arms ae contact to the BTS switch of the substation and the CET switch of the central station will advance to the next set of contact pads, and since
 EMI46.3
 the 11R relay is of the mechanical type, its armature will be maintained in a fanned position, regardless of the bohine excitation, 1 and, at its play with the spring-loaded .cs,

   a circuit is formed which lights the indicator lamp LDR of the indicator board and thus warns that the respective switch to which it is assigned to subtraction is in its formed position. Suppo-
 EMI46.4
 sounds now only at contact set u 1 Following switching

  <Desc / Clms Page number 47>

   their BTS the contact lever 3f meets the positive 'of the battery; relay C will be a @@ s energized and, when energized
 EMI47.1
 following re-entry El a circuit is established starting from the positive to the contact lever If, to the armatures e3 and Il (fig. 4), to the driver 59, to the coarsening of the IF relay (fig. 6) e to the negative of é: 1. drums.

   By attracting its elders, the IHF relay causes the transmission, through the line, of an impulse of frequency 1400 to excite the
 EMI47.2
 RH relay to the central station -f'ig.il, ui9 in turn connects the ppsitif via conductor 65 to energize -Relay 3B (fig.I4); this reJ.é: 1.is, at its ctrmuture 2bl, j. connects the positive to the battery intermeui, iae to conductor 95 to excite the CBM magnet (1 "igoI5) at'ina and keep the r8.1.l: I.is Z closed and reconnect, by l 'Intermediate armature 2b3, the positive of the .battery by means of the conductor 98 to the contact arm 5g.



   In the case of the present example, it will be assumed that the switch corresponding to the third set of connectors
 EMI47.3
 BTS switch tacts (figo 4) was closed and has just been triggered The corresponding LR coil uu remake which is currently connected with this oomnutateur, has previously been energized, so that its armatures are kept in their attracted position. The connection with the posi -
 EMI47.4
 tif of the battery, through the intermediary of the arm ae contact 5g which has just been mentioned closes a circuit on the trigger coil b,

   so that it triggers the lock to bring back the reinforcements of the coil
 EMI47.5
 to their position nhxrmalea and that the position of this mechanical relay seen correspond to that of the xe.s of the xoas-sta-

  <Desc / Clms Page number 48>

 yours.
 EMI48.1
 



  The lower armature of coil i forms a latch circuit on coil b from the battery positive to the, rewind button AM of the transformer p. lower l.xm.tu.e of coil b, which;, been "t - :; i; '" I;: j6J an ignition circuit for the green indicator lamp IDGE is provided <Jpart! in a way which will be described later. Therefore, when the BTS switch (rig.4) turns to determine the position of the switches and branch change switches.
 EMI48.2
 The central station's CBT switch (fin.15) operates synchronously to operate the indicator lamps there in a corresponding manner.

   Now, when the BTS switch has. a full turn, the contact lever will exit the connected keys in
 EMI48.3
 multipiej and the circuit a * reciprocal action of the relays ± and F is interrupted, so that the circuit
 EMI48.4
 engine like it BTS cese of agiw, in order to allow the contact levers to remain in their rest position.

   The levers ae contact of the com.'liuti; J, 'G6U, the CET of the. central station will be kept in the rest position, and although relay Z (2ig. 14) has been set to 1;: essrtion of pulses, the reiais GB (, which had at> 1 excited for a circuit comprising 1'i: Jr! 11él.tu.J: 'e .1lend ,:

  t ntlle the relay Z the anointing # born) is kept energized by udoircuit which seen in the negative of lu bump up The Os coil, the cbl armature and the. conductor 99 to the battery positive with the springs normally closed of the ARK warning reset button (fig.

     15). By attracting its reinforcements, the relay

  <Desc / Clms Page number 49>

 
 EMI49.1
 Z a on the other hand connects to its armature 4 the positive ae the battery by the intermediai e of the armatuae f'bl (fig. 14) and the relay winding differs FA to the negative of the battery. being thus excited, connected, to its armature fal, the positive ae the bat-
 EMI49.2
 rie with the IOU conaacteai through the intermediary of the lower armature drawn to the coils, ±, relays, such as ILR (fig. 15), so that the green signal lamp LDG connected to each of the coils b energized, can light ± -.
 EMI49.3
 



  2 the armature Za2 (i'igog4) has also been closed a circuit for the relay FB which by attracting its armature fb1, opens the circuit of the relay FA. The combined action of the FA and FB relays will therefore intermittently connect the positive of the battery to the conductor.
 EMI49.4
 common 10U to intermittently illuminate all of the green signal lamps connected to all coils b vei-iouiiied on the ARE recall key, while the quotation at the CBT switch continues.



  These alternative .LLUg8S still continue after the triggering of the Z relay as a result of the substitution of the positive connection, via the ar-
 EMI49.5
 mature z4, a'un rc: lccOl'Ue! 11ent uu positive from to battery via the firm springs nOJ.'m.L8ment of lc, button ae rappei 3. (fig.I5) to conalJ.ctel1.1 : 99 and ae IltL'il'1atume cbl. So I killed the switches that were there since. Previous veit'i ction have changed position and have been triggered will be clearly indicated by a signal lamp lighting up intermittently.

   It should be noted that all the lamps are mounted on

  <Desc / Clms Page number 50>

 
 EMI50.1
 an appropriate indicator board placed in sight to the monitoring of the central station, 81: i the broken indications could p ';;! ". The etbl \: 3m (;!. nt be combined as
 EMI50.2
 follows:
 EMI50.3
 1.Red light on fixed for "switch closed" 2. Green light on fixed for Air.,: Switch open ,, 3. Green light on intermittent to inform "Interrupt open since check. 1 ? .r: ';; c "; aente'l.



  As soon as he, e, takes note of the various signals received, .the oversee-Lnt will operate his key as reset ARE: signals (fig. 15) and coils b seen; - rusty with es will be triggered, the intermittent light signals being a2DL-s transformed into brawling light signals. The CB rela.is is thus.dëllockilië
 EMI50.4
 also, do so that it triggers and opens
 EMI50.5
 the action circuit combines FA and FB relays, equally interrupting the 11 :: 1..L circuit. signal output from the PAL table (end 15). In the armature cb2, (fig.I4) the bridle OB separates the positive of the battery and the conductor IOI for or --- 'ÍT'i: t. The ringing circuit ci' 1: I.1 :; ,: r: common CAB (fig. I5) which was formed when the relay 'ES a. been aroused the pJ.'r6 time.



  Considering at P ± -S6.nc the case where.the 4th comaBi (end. 15) will be disturbed, or if it receives an incorrect number of pulses at the corresponding switch of the substation, if the rematch Z is triggered, the contact levers 1g e 2 will be engaged on the common multiple of keys of their panels and will thus hook up - The following circuit: From positive to. the armature JE5 (1'ig. 14), by the conductor I2, the arms of

  <Desc / Clms Page number 51>

 contact 1g or 2g and the common multiple, the driver
 EMI51.1
 10 '), the lower enltoaiement de gaibàe resistance of the resis 89, (rigo 14), -The conductor 104, the switch springs cbm and by the winding ae 1. 1 è: Lj.ment engine CBM au do not use the battery.

   Both the ROP glow and the CBT magnet are energized on this circuit and since the latter is energized on a self-interrupting circuit the contact levers of the CBT switch will therefore be returned. to their position at rest. In at-
 EMI51.2
 pulling son /: Lr. 1è: Ltul'e., 18 re-Luis RIF exme you a circuit of go ± (16 for its superior rouj-emant ending in the positive of the battery by the è: Lr'aJ .è: Idle ltlU'e nk4. The RP relay also reproduces -The state described above of the meter key, that is to say, to the drma, ture equal to the contact pad wanted, which is occupied by the arm of
 EMI51.3
 contact le., (t'igal2) is repeated by the positive of la. battery qa 'at the angle e gz5 the positive of the battery is connected by the intermeaiai; e of the conductor 22 (end.



  12) for allmex the receiver gaives at frequencies 600 and 1400 at the central station, while at the arma-
 EMI51.4
 ture, rp4 a circuit is: rerïne on the relays X and U whose excitation can move the contact levers
 EMI51.5
 switches, -, Zcurs CSS and MCS on their respective tables in the manner already explained on occasion for the selection of a device to be measured As a result of the identification at the contact pad acting in combination with the
 EMI51.6
 contact arm the.

   of the CSS switch, 9 pulses of the. frequency 600 are transmitted in the manner already described to the substation to bring the contact arms as this switch to their 10th position. As soon as the

  <Desc / Clms Page number 52>

 contact arm meeting the location of the contact pad, the SW relay will be energized to transfer the contact to the current input at frequency 1400 and 8 pulses of this current are then sent to the substation, to force the switch its (fig. 1) to move its contact levers to the 9th position.



   The soft switches ae ia the substation thus operated,. The relay H is again actuated to actuate the CO relay and. The following circuit is found a-. Law established to again effect the excitation of the relay RSR: from positive to The armature h7 (fig. 1) by the contact lever 3d and the 9th contact pad,. The conductor 105, the pads connected in common multiple and the contact arm 4f, the winding to the RSR relay (fi g.



  4) and the negative of the battery. The SRS relay then attracts its light armature rsrl to close a latch circuit for itself and open the circuit of relay H, and in turn that of relay CO. Since the RSR relay is energized again, the SPC (fig. 3) and BTS (fig. 4) switches will again be actuated in the manner already described to retransmit the inaica- tions relating to the switches, to the central station, and thereby perform a check on the previous operation.

  <Desc / Clms Page number 53>

 



     In this regard it should be mentioned that a special control button) CHIC (figo 13) is also provided, just in case. one would like to check the switch readings for whatever reason, even 8 'no trouble occurs.

   The operation of the CHK control key (figo 13), reproduces that of the RP relay, which results, as was explained in the description above, to re-energize the RSR relay of the substation, and to make the switches of the latter renew their rotary movement in order to check the indications relating to the switches, With regard to figo 9 11 it should be noted that, although the description has been limited until now to the operation of switches acting in combination with the BTS switch contact boards (Fig. 4), in certain cases,

   determined groups of contacts of this switch will be connected to switches called change-of-branch switches p and whose function consists in changing taps on a transformer, etc. Such a set of mechanical locking relays acting as a combination with these switches is shown in 32LG framed by a dotted rectangle, at the bottom of the 9p frame. Those skilled in the art will realize that controlling branch change switches is a more difficult problem than that of switches, since, in general, these change-of-connection switches are provided with a set.

   single circuit closing contact, which must be used to keep closed certain relays connected with the connection change switch which is action @

  <Desc / Clms Page number 54>

 born, and in marl time to trigger on the contrary - some relays connected with the branch change switch that had been operated previously. The arrangement by which these conditions are fulfilled will be described in detail below.



   Suppose now that the switch of the change of branch in question is placed in the posi-
 EMI54.1
 closed tion i'armature 106 indicated in fig, 9 'which is mechanically coupled with it $ will be actuated and
 EMI54.2
 go to the next circuit.

   From positive to the armature to rest z16 (figt3) by conductor 85, the springs normally '' '' m ment closed of the check button TK (fig. 9), the
 EMI54.3
 common conductor connected to all j-cs commatetears and branch change switches, 1 axmature attracted 106 of the branch switch in qaestion, the motor coil coil a of the mica- niqua 32LG latch relay, the lower armature at rest of this relay the common conductor 107 and the upper winding of the re-
 EMI54.4
 leave TS7 (fig, 3, at the negative of the battery. The coil of the 32LG relay, as well as the TS relay are by cOnSé? 01 when excited in series and this last relay;

  'by attracting its armature tsl motc its lower winding in coart-circaih so as to delay its own triggering, while the armature 3 the positive of the battery is tuned via the conductor 108 to complete a circuit of locking for the coil a (fig. 9).

   It is
 EMI54.5
 note that despite quiz the coil ± by attracting its armatures, it opens its own excitation circuit and the excitation circuit of the TS relay (freezes), these relays do not re-
 EMI54.6
 I fell not slamming since both are late,
 EMI54.7
 denies the first by means of the iJms:

  , copper sseotte entot rant its nucleus "second m.eyen garlic z winding its 32 (> Yatit and the second by means of li

  <Desc / Clms Page number 55>

 lower in short circuit, During the time that elapses before the TS relay trips, the positive is
 EMI55.1
 aconnected to the armature ts3 By the conductor 108 Can lock the coil ± Figo9) in its closed position, while to the armatare ts4 (f.gQ3) 9 the negative of the batte4 rie is connected through the resistor #r and by the attracted armatnre ts4.

   the common conductor 19, the lower armature of the shore coil is attracted, and the flow goes to the coil aa positive of the battery o On the other hand the negative of the battery is connected, by 1 intermediary of the common condnctemr jaD9e to the circuit of coil 1 of the crrno. connection change state actuated previously but not shown ao. drawing.

   However, the action of the coil on the connection change switch shown in the drawing has no effect, since the ± coil is at this time +
 EMI55.2
 there maintained excited but Inaction of the coil b on the braaehement switch actuated previously triggers the mechanical locking of this switch and makes it abandon the armatures of the coil b since the cir-f cu.it of this coil a is open when the contacta 106 of the connection comml.l'h1't'sl11 'are closed, we do not contact the connection switch being closed at the same time Due to the tripping of the TS relay (fige4) all
 EMI55.3
 b coils are put hots going,

   but the coil A of the branch change switch in question will be kept in its energized position by means of
 EMI55.4
 of the t1errlJ7ll: - '' ,, 'mechanical 0 In addition, it is advisable to Mention qllten attracting its reinforcement tE3 (fig <, 4) the TS relay completes a circuit which energizes the relay

  <Desc / Clms Page number 56>

 BSB. This locks in the manner described above and activates the switches SCC (fig. 3), and BTS (fig. 4) in order to transmit the relative indications to the switches and the bypass switches to the central station. .

   As in the case of the re-
 EMI56.1
 relating to the switches p the absence of connection with the positive of the battery to the contact pad working in
 EMI56.2
 combination, with the contact arms 31 and 7L will detors milierp in the way already described% the transmission of impkczlsions of the frequency 600 from to the central station, while the presence of a positive potential of the bat. rie to the contact pads will cause the transmission
 EMI56.3
 pulse, frequency 1400 at the central station to perform a different maneuver there,
 EMI56.4
 The equipment of the relays for the central station hook-up change switches differs slightly from that of the switches and it is such a
 EMI56.5
 typical set which is represented by 32LRj containing danreo # dotted tangle at the bottom of fig. 15.



   If we now examine in detail the operation of the circuits * we see that when the control levers
 EMI56.6
 contact 31 and 7.f of the BTS switch meet the pose. tif of the battery, corresponding to a branch change switch in the open position., a pulse of frequency 1400 will be transmitted to the acoustic frequency equipment of the central station to effect the excitation of relay 2B (fig, 14).

   This relay connects to the armature @ 2b3 the positive of the battery
 EMI56.7
 driver 98 and if to. At this time, coil A of relay 1 32LB had been mechanically locked to indicate that

  <Desc / Clms Page number 57>

 the branch changeover switch is closed, a circuit would be closed for the lower coil b which, by fanning its armatures, triggers the mechanical locking to allow the armatures of the coil a to be tripped, but being fitted with a flyweight in intoxicates the coil b can remain energized during the transitional period during which the armatures of the coil trip, so that a locking circuit is now closed through by the normally closed contacts of coil a,

   and the upper contacts of coil b, to the positive of the battery connected to the reset button for signal ARK 0 Coil b is therefore locked in the excitation position so as to be ready to emit a intermittent light signal which will be described later
By suppressing while the contact arms 3f or encounter a disconnected contact corresponding to a branch change switch in its closed position, a pulse of frequency 600 will then be transmitted to the acoustic frequency equipment of the central station, to activate relay 1B.

   To its armature lb1, this relay then connects the positive of the battery via the conductor 97 and via the contact lb3 to energize the battery a with a relay identical to '32LB (fig. 15), in such a way that this relay will then be locked in its excitation position for a certain period of time, by means of a mechanical lock, and to its undermined armature,

   the circuit is formed on a signal lamp corresponding to the position of the switch for changing the connection of the substation.

  <Desc / Clms Page number 58>

 lamps for signaling the positions of the substation connection change switch *? * could preferably be provided as follows
1 Fixed glow for the position of. connection.



   2 Intermittent signal indicating the previous position of. connection, until the ARK signal stop button (fig. 15) is operated by the supervisor at the central station.



   The operation of the lamp cooperating with the branch switch 32LR, with some slight modifications of the circuit due to the. that there is only one lamp instead of two is very approximately as described in the case of the maneuver for a change of position of a switch.



   A description will now be made of what is known as telegraph equipment and by means of which certain predetermined instructions can be transmitted from the central station to a substation by operating certain sets of controlled springs. - dice by the rotating arm of the telegraph,

   that the supervisor places in a position corresponding to the instruction he wishes to transmit. On receipt of this signal at the substation, the supervisor of the substation operates a similar telegraph switch to a position corresponding to the received signal and thus transmits to the central station a repeater signal to indicate to the attendant there that the desired signal has been received. It should be noted that the telegraphic manipulation could with advantage receive the form of the command transmitter. . (,

  <Desc / Clms Page number 59>

 well known aboard ships,

   and be provided with a lever controlling a needle moving on a dial bearing certain abbreviated instructions so that certain signals are emitted when the index is brought to the desired position.



   By examining then the detail of the circuits to be operated, we see that it is very similar to that described for the selection of the meters, so that certain modes of operation of the relays will be easily understood without the need for mention specially the circuits,. Now return especially to the telegraph equipment used at the central station and designated as TLH in the lower part of fig.

   13, it will be noted that it comprises a series of springs each of which can be operated separately to ensure that a specific determined command is sent to the substation,
Assuming then that the rotating arm of the telegraph switch is brought to its first position, a set of UNS working springs are actuated for a purpose to be specified later while the operation of the left spring set , assigned to the first position of the switch, establishes a mark at the 17th pin of the contact panel belonging to the contact arm la of the selector switch CSS (figo 12)

   The operation of the set of springs on the right prepares a circuit for a signal lamp and also connects by means of the normally closed springs of the telephone button the positive of the TPK battery by the conductor 12 to actuate the relays X and 0 (figo 12), so that the motor circuit will be closed.

  <Desc / Clms Page number 60>

 me on CSS and MCS switches;

   at the same time that the receiving valves of frequencies 600 and 1400 of the acoustic frequency equipment of the sound-station will be switched on,
During the first phase of the rotation of the CSS switch (fig. 12) 10 pulses of the frequency 600 will be transmitted to the sub-station to give the SSS switch (fig. 2) a rotational movement until its 11th position, In this position a circuit is prepared for the 2TG relay connected to the contact board 1c in series with a similar ITG relay indicated in fig. 8, which belongs to the telegraphic equipment of the substation. On the other hand, it will be noted that when the contact lever 2c of the SSS switch (fig.



  2) meets the set of common contact pads $ an impulse will be transmitted to the polarized relay 1EP and 2EP (fig.8) by the following circuit; negative of the battery by resistor YB (fig. 1), the drawn armature 13 (whose relay is actuated as explained previously, to transmit impulses to the SSS switch) the conductor 110, the control lever contact 2c and the common contacts of the panels, the conductor 111, the winding of the polarized relays 1EP and 2EP (fig. 8) in series, the conductor 112, to the armature 4 (fig.l) and to the rostif drums .

   As a result of the direction of the current flowing on this circuit, only the polarized relay 1EP is energized and connected, to the armature lepl the positive of the battery not through the relay SR with low resistance, to actuate the magnet mo - turn of the THS switch,

  <Desc / Clms Page number 61>

 
Following tripping of the polarized relay
1 E P when, at the end of the pulse, relay L drops out, the THM magnet will be demagnetized and the THS switch contact levers will be advanced to their second position. position and, since the relay SR is also energized in series with the motor magnet, this relay now open, at the armature Sr1, the feedback circuit of the THS and TCS switches.

   The 7 other impulses emanating from the switch CSS (fig. 12) of the central station, will as a result of the excitation of the relay SW be transmitted at the frequency 1400 and are received at the substation to actuate the impulse relay there. AA which brings the contact levers of the SCS switch (figol) to their 8th position; furthermore, during this maneuver, from the SCS switch a corresponding number of pulses is transmitted to the polarized relays 1 EP and 2EP (fig. 8), but this time in the opposite direction by the following circuit: from the negative of the battery by resistor YB (fig. 1), armature aa2, conductor 112, relays 2EP and 1EP in series (fig. 8)., conductor 111, contact pad and contact lever 2c of the SSS switch (fig. .12), to the battery positive to the aa3 armature.

   Under these conditions the relay 2EP alone is actuated, and closes to its armature attracted 2epl a pulse circuit on the motor magnet TCM of the switch TCS in series with the low resistance relay SR, so that the contact levers of the switch TCS switch are moved to their 8th position.



  The SR relay. being armed with a copper weight, is delayed tripping and therefore constantly maintains its armatures attracted by means of the two pulse periods, in order to keep the circuit open for the return of the two switches THS and TCS.

   Since the

  <Desc / Clms Page number 62>

 contact arm of the. THS switch are now in the second position and the TCS switch contact arms are in the 5th position the fol- lowing circuit is closed: the battery negative, the H relay winding, l 'CO2 frame (fig.l), the frame:

  - re rsr4, the contact lever 2d and the multiple controls, the conductor 113, the contact lever 2h and the second contact pad of the THS switch (fig. 8) the normally closed springs of the telegraphic switch of the TGH substation, the 8th contact pad of the TCS switch and its contact lever 2k, the winding of the 1TG relay, the conductor 114, the winding of the 2TG relay (fig. 2), the connected contact pads in common multiple and the contact arm 1c of the SSS switch and finally the positive of the battery. The relays 1TG, 2TG and H are consequently excited in series on the circuit which has just been described.



   To return again to freeze 8; It should be noted that given that the contact arm 1h of the THS switch is in the 2nd position, and that the contact arm 1K of the TCS switch is in its 8th position, tan circuit is established from the positive of the battery by the low resistance relay AM in series with the appropriate lamp, to the battery negative connected to the contact lever lk.

   The AM relay is thus energized and closed, in its am1 armature, a circuit which activates the alarm bell AB, while the lighting of the lamp which is opposite an abbreviated instruction indicates to the supervisor. sound-station the order which was transmitted from the central station. The activation of relay 1TG (fig. 8) keeps the circuit open.

  <Desc / Clms Page number 63>

 resetting of the two switches THS and TCS to the armature tg1, while the energization of the relay H (fig.l keeps the CO relay energized in a manner already described;

   and that the excitation of relay 2TG (fig.2) connects the positive of the battery to the armature 2tg1 (figo4) of the latter via the conductor 74 so as to actuate the relay 1MF of the acoustic frequency equipment of the substation,
The latter then transmits an impulse of frequency 600 on the line to actuate relay 1B of the central station (figo14) and, since the relay MR of the equipment of the central station is also energized under these conditions, the circulated according to the troave established to actuate the control relay SG: from the positive of the battery to the armature lbl (fige14);

     by the fittings 2b2 and mr4, the conductor 115, the ONS springs of the TLH telegraph switch (fig.13), the conductor 116, the winding of the SG relay (fig.14), to the negative of the battery. Being energized on this circuit, the SG relay connects, to the armature sg1, the positive of the battery with the conductor 117A, the set of actuated springs of the telegraph switch and the corresponding signal lamp to the negative of the battery .; The lamp lights up to indicate to the supervisor at the central station that the instruction has been received by the supervisor of the substation.

   At the armature sg2 (fig. 14) the positive of the battery is further cut off with the conductor 117 which is connected via 4 ONS springs to the conductor 101 so that the circuit for the call ring common CAB (fig. 15) is open.

  <Desc / Clms Page number 64>

 



   When the substation supervisor perceives that the signal lamp of the substation equipment has come on, he will bring his TGH telegraph switch to a position corresponding to the instruction received. In this way, the special spring set at this position is actuated to open the circuit of the 1TG, 2TG and, H relays which, it will be remembered, had been energized in series.

   The 1TG relay by releasing its 1tgl armature (fig.8) closes the feedback circuit on the THS and TCS switches and since the movement of the rotary arm of the TGH telegraph switch has the result of operating the TGN working springs , a circuit is also closed on the magnet which triggers a mechanical pawl, to allow the return of the. rotary arm of the main switch of the TGH telegraph to its normal position ... under the influence of a return spring.

   When triggered, relay H opens, at its armature h3, the locking circuit of the CO relay (fig. 3) which drops out and then closes, at its neck armature, the return circuit of the SSS and SCS switches already described. in detail above, The 2TG relay opens., by tripping, at its 2tg1 armature, the locking circuit of the IMF relay of the acoustic frequency equipment of the substation and the frequency 600 is then found. removed from the line circuit in order to trigger relay 1B of the control equipment of the central station, which, it will be remembered,

     controlled a latching circuit for the SG relay through the working springs of the. TLH telegraphic switch (fig. 13). When triggered, the SG relay opens, at its sg1 armature,: The circuit of the indicator lamp of the telegraph equipment, and closes

  <Desc / Clms Page number 65>

 in its sg2 armature (figo 14) a circuit to activate the common CAB call bell (fig.15).

   The supervisor of the central station is thus informed that the supervisor of the substation has effectively brought his telegraph switch to a position corresponding to the instruction which had been transmitted and this maneuver makes it possible to ensure a ensure that the correct signal has been received at the substation. The supervisor of the central station then returns his telegraph switch to the normal position in order to close, in the manner already described, a return circuit for returning the switches CSS and MCS to their rest position.



   We will now describe the telephone communication established between the central station and the various substations as well as the various maneuvers which are carried out when the supervisor of the central station wishes to speak to the substation. To do this, he momentarily places the TPK telephone button (fig. 13) in the call position, the upper springs being actuated. Therefore, the positive of the battery is connected, to its set of upper springs, through the
TC / diary of conductor 118 and of relay / (fig.14) which is thus locked by means of its armature pulled to 2, to the positive of the battery at armature mr2.



  With the armature tc3 the relay TC prepares a point of the circuit for 1 r lower winding of relay TR while. that to its armature such (fig.12) the relay TC connects the battery positive to the 17th contact pad of the CSS switch to mark the call position of the telephone and, to the armature tc4, (figo12 ) connects the positive of the battery via the s1 fittings

  <Desc / Clms Page number 66>

 rp4, z1 and uk3, the contact pads connected in multiple and the contact arm 2a to energize the X and u relays.

   As in the previous description of the way of connecting a counter, the excitation of relay X determines a setting in rotation of the switches CSS and MCS which thus transmit during the first part of their rotation eight pulses of the frequency 600 to the e. - acoustic frequency equipment of the substation to bring the SSS switch (fig. 2) to its 9th position.



   The other nine impulses emitted by the CSS switch are transmitted at frequency 1400 to actuate the SCS switch (fig.l) of the substation and bring it to its 10th position. The relay TE is thus energized from the positive to the armature h7 by the intermediary of the contact lever 3d of the switch CSC and is locked in the excited state on an AC circuit formed by its own armature te4, the driver
119 and armature n3 to the battery positive., 'At its armature te5 (fig. 2) relay TE opens the locking circuit of relay H, which is triggered and in turn opens at armature te3, the CO relay circuit.

   The triggering of the latter relay determines the return to their original position of the SSS (fig. 2) and SCS (fig.l) switches on a circuit already described above.



  At its armature te3 (fig. 3), the relay TE also closes the following circuit to activate the call bell from the telephone circuit to the substation: from negative to resistance YD (fig. 3) by armatures te3, n2, the normally closed springs of the SWH hook switch of the telephone and the winding of the intermittent ring and to the battery positive.

   To its reinforcements such and te2 the relay TE connects the râlais N on horseback

  <Desc / Clms Page number 67>

 on the telephone conductors through the battery positive, the lower winding of the N relay, the arm / ture you 2 to one of the sides of the telephone conductor and the battery negative through the upper winding of the N relay and the armature attracted such as to the opposite side of the conversation conductor, so as to ensure battery power for the telephone circuit. When the substation supervisor then picks up his telephone receiver to answer the call;

     the springs of the hook switch SWH are operated to cut off the ringing current and connect the transmitter and receiver to the line circuit o Relay N is actuated under these conditions in series with the telephone set and opens, at armature n3 (fig. 2) the locking circuit of relay TE which is restored.



   To return again to the equipment of the central station, it will be remembered that the final movement of the switch CSS (fig.12) actuates the relay MR by means of the contact lever 4a and the armature x3.



  Under these conditions, the energization of this relay opens the locking circuit of the TC relay on the armature mr2 (freeze 14) and during the period of delayed tripping of this last relay, a circuit for the lower winding of the TR relay. is established as follows: from the positive to the armatures mr2 tc3 by the lower winding of the relay TR and to the negative o The relay TR then attracts its armatures and establishes to its armature tr2 an alternating locking circuit for the positive of the battery connected with the conductor 120, by the lower springs normally formed by the telephone's TPK button (fig.13).

   When the TC relay tripping

  <Desc / Clms Page number 68>

 occurs, at the end of its delay period, the locking circuit of the TR relay is opened, and this relay is activated in its turn at the same time that a circuit is closed on the CSS and MCS switches. reminder in the manner described previously .. since the relay TR is now locked in the energized state, the positive of the battery, at the armature tr1 (fig. 14), is connected to the conductor 101 to activate the bell call and thus indicate to the central station supervisor that the call has been transmitted to the substation.

   The supervisor then momentarily lowers the TPK telephone button (fig. 13) to the answer position in order to actuate the lower contact springs and thus open the locking circuit of the TR relay which trips and opens. the CAB bell circuit and since the supervisor's telephone circuit ends with a plug, this plug can be inserted into the appropriate jack 121 (fig.13) to complete the telephone circuit. fuck which is the following:

   the top springs of the jack 121, the conductor 122 (fig. 12, 11 and 10), the armature to 1 (fig. 10), the upper side of the high frequency filter 400 HPT, the balanced primary winding of the transformer XF4, conductor 16 which leads to a balanced primary winding similar to transformer 1XF4 (fig.6) of the acoustic frequency equipment of the substation? the upper optic of the 4COHPS high frequency filter, the ltol armature, the conductor 123, the transmitter and the receiver in series of the substation (fig. 3), the conductor 124, the lto2 armature (fig. 6) , the lower side

  <Desc / Clms Page number 69>

 laughter of the high frequency filter 400 HPS,

   another balanced primary enron lement from the lXF4j hybrid transformer, driver 17, to the central office acoustic frequency equipment the high frequency filter 400 HP, armature to2, driver 125, to the lower springs of jack 121 (fig. .13). It will be noted that the acoustic frequency equipment of the substation and of the central station represented by FIGS.

   6 and 10 are connected to the line via the winding of a hybrid transformer designated in one case by 1XF4 and in the other case by XF40 This transformer has the role of isolating the circuit telephone of the receiver of the acoustic frequencies Thanks to the balanced winding of the hybridized transformer together with the compensating network framed in the dotted rectangle, the conversation currents of the circuit connected with the central points or 'bridge' of the hybrid will have very little influence on the circuit connected with the secondary winding leading to the receiver of the acoustic frequencies.

   The insertion, between the telephone circuits and the short-circuited points of the transformatear; of the high frequency filter 400 HPT also prevents the low frequencies caused by the conversation from activating the receiver of the frequency 300. It is important to note that this device does not appreciably affect the quality of the transmission. - mission.



   Consider then the case of a call in the opposite direction, that is to say from the substation to the central station, the, the maneuvers of the circuits will be as follows * By picking up in the known manner its

  <Desc / Clms Page number 70>

 receiver to initiate a call, the substation supervisor closes the following circuit:

  *. the negative of the battery connected with the lower winding of the relay W (fig. 3), by the armatures te3 and n2, the circuit formed by the transmitter and the receiver in series, the armature n1, the first contact of the contact arm 3e of the switch SPC, and said contact arm, the conductor 94, the first pad of the board, of contacts, and the contact lever lf of the switch BTS, to the positive of the battery.

  <Desc / Clms Page number 71>

 



   Relay W is energized on this circuit and closes a locking circuit to its armature Wl, from the positive connected to contact lever 4e, by the first pad of the contact panel of the switch SPC, the energized armature W1, the lower winding of celais W in series with the upper winding of relay N at the negative of the battery. Relay W is thus locked in the energized state Relay N is also energized on this circuit $ since it can close a locking circuit for itself,

     comprising the two windings in series with the transmitter and the receiver via the n1 and n2 armatures The W relay, by completely attracting its armatures, fulfills the following functions: to the W2 armature (figo4) it connects the positive of the battery, connected as explained above with the armature 103, the conductor 91,

   relay 1LF of the acoustic frequency equipment of the substation to the negative of the battery 0 Relay 1LF is energized and thus transmits a frequency pulse 300 over the line to actuate the relay RL of the acoustic frequency equipment of the central station 0 The relay RL in turn connects the positive of the battery via the conductor 92 to the relay 8 (figo14) and the latter connects to its armature S3 the positive of the battery on the conductor 22 to turn on the receiving valves of frequencies 600 and 1400.



   In armature W5 (figo 4) is also open the return circuit for the switch SPC and in armature W4 (fig.3) is prepared a point of the circuit for relay KN; to the armature W3 (figo4) the relay C is energized, and to the armature AW2 is also closed a circuit by the information of the pads connected in common multiple of the switches.

  <Desc / Clms Page number 72>

 tor BTS to actuate relay F via contact C1 and conductor 90, This relay F then acts in combination with relay E to actuate switch SPC in the manner described above,

   In order to allow adequate time to pass for the receiver valves of the frequencies 600 and 1400 of the central station to reach the desired temperature, another change of temperature does not occur, until the contact lever 3rd of the SPC switch arrives at the 10th contact pad. At this moment, and as a result of the energization of the relay C, the positive of the battery is connected to the contact lever 1f and its first contact pad, or conductor 94, to the contact lever 3e to the armature cl and to the conductor 59 to energize the 1HF relay the acoustic frequency equipment, of the substation,

     in order to transmit a pulse of frequency 1400 on the line to actuate the RH relay of the acoustic frequency equipment of the central station, the latter then in turn connecting the positive of the battery to the conductor 65 for activate relay 2B (fig.

   14)
The relay 2B, while operating, connects the positive of the battery to its armature 2Bl (fig. 14) via the armatures lb2. mr3 and Z2, and from the upper winding of the relay TR to the negative of the battery, The relay TR thus energized closes a locking circuit going from the negative of the battery through its lower winding the armature attracted tr2, the conductor 120, the springs at rest of the TPK telephone button (fig. 13), on the battery positive.

   The relay TR by operating $ branches from a part, to its armature tr2, the positive by the conductor

  <Desc / Clms Page number 73>

 120 on an auxiliary circuit formed by the conductor
 EMI73.1
 126 to light the TOL telephone call lamp (figo13) and, on the other hand, to its tr1 armature, the battery positive on conductor 101 to activate the bell
 EMI73.2
 common call CAB (f'.gal.5o To disallow the substation equipment, we see that the reciprocal action of relays 3 and F of the substation equipment:

  We will continue until the contact lever 4e da eczmutateaoe SPC (fig3 gives up the multiple of the contact pads but $ at this moment, the relay W is triggered and opens at its armature W2 the
 EMI73.3
 circuit of relay Fy so that the interaction of relays E and F will break at the same time as its t = armature W5y relay 1Jlf closes a circuit for resetting the SPC switch, going from the positive of the battery by contact lever 2 of the BTS switch (figo
 EMI73.4
 4 the armatures ra1'3 and W5 $} the conductor 127 "the switchboard switch and the contact lever 2 the wing switch springs .9, 19 SPM motor magnet winding, to the negative of the battery,

   
On hearing the common call ringing, the central station supervisor moves his telephone button TPK in the direction of the answer and thus opens the lower springs so as to trigger the TR relay which in turn interrupts the circuit of the telephone. ring the bell. In time the supervisor introduces his file
 EMI73.5
 telephone in the corresponding jack the TCL call lamp and the transmission circuit traced previously
 EMI73.6
 for the apparatus of the sub-state is found closed so that the conversation can also take place.

   AT

  <Desc / Clms Page number 74>

 at the end of the conversation the supervisor of the central station will remove his plug from the jack, and will thus trigger the relay TR, while the supervisor of the substation will hang up his receiver ot will thus trigger the relay TK N , so that all the equipment is now returned to its resting position
With reference to fig. 5, 8, 9 and 16 to 19 which represent the control apparatus of the substation $ and in figs. 13, 15, 20 and 21, which show the control apparatus of the central station, a second above-mentioned application of the invention will now be described.



  * These drawings must be arranged in the manner indicated in the diagram fig.22 so as to constitute a complete circuit in accordance with the invention.



   This variant differs from the device described above in that the acoustic frequency equipment is omitted and that the control is exerted by the intermediary of an established metal circuit; between the central station and the substation But, since the two devices allow similar results to be obtained, certain circuit operations which will be easily understood from the preceding description, will only be mentioned briefly, while d other maneuvers that are special! to this particular device will, of course, be described in detail
Suppose now that it is desired to obtain a reading from the measuring device N 2 of the substation.



   ,.



  The button of the devices N 2 shown in the lower part of FIG. 13 will be operated in a manner similar to that already described previously, and will thus connect

  <Desc / Clms Page number 75>

 
 EMI75.1
 the positive of the battery via 1 # through the rp2 and tale armaters of conductor 10 and the normally closed contacts of the button in series to locate the
 EMI75.2
 contact% 9 internally of the conductor 11 connected to the contact lever lA of the control switch CSS (fig. 20) $ while the set of springs on the side of button 2 the positive of the battery is connected through the inter- mediare of the normally closed contact of the TPK button, of the 12p conductor and of the tc2, rp3, 2Z4 armatures for actuation,

     relay ST (figo20) in parallel with relay U and the lower bearing of relay X which are connected with contact arm 2A of switch CSS.
 EMI75.3
 



  By attracting its armature stl (fige21)., The relay ST prepares a point of the circuit of the polarized relays 1B and 2B connected straddling the circuit of the line at son-station 1. The relay U closes, at its armature ul , a point of the delayed relay Y circuit (figop and prepares for ar-
 EMI75.4
 matuxe u2, zen point of the pulse circuit for the circuit substation which will play its role later, while at its armature u3, the relay U closes one. motor circuit on
 EMI75.5
 relay V fig2 Relay V operates on 1 armature. It oavro. the relay Up circuit it closes on its arma ..

   tare v2 an excitation circuit for relay Y, it closes to the armature v3 an excitation circuit for the motor magnet CSM of the control switch CSS to prepare the advancement of the contact levers and connects, to the arma-
 EMI75.6
 tare 14 (figo21) the positive of the battery via the armature at rest to close an excitation circuit for the motor magnet MEM of the commatatear connector Its LES counters. 0 The Y relay attracts its armatures and
 EMI75.7
 closes a latch circuit for itself to armature Y from battery positive to armature ul

  <Desc / Clms Page number 76>

 which will be., of course. '),

     kept attracted during the trip period of the U delay relay; armature y2 (fig. 21) relay Y formed an excitation circuit for relay 2H on its upper winding, and this relay closes, at its armature 2hl (fig. 20), a circuit for the upper winding of the X relay.

   The reciprocal action between the relays V and Y will consequently determine an intermittent excitation of the magnet of the case and MCS switches, so that the contact levers will be automatically rotated on the contact pads; about the first of the two switches, he and to notice that when the contact arm 4a meets the first part of the miltiple of the contact boards, it closes the next line circuit at the substation :

   the positive of the battery connected with the lever of: contact 4a of the CSS switch (fig. 20) by the first part of the contact pads connected in multiplet the conductor 20 the armature mr4 (fig. 21), the frame X2, the conductor '202 leading to the substation the armature wa3 (fig. 19), the conductor 203, the co2 and sr1 armatures (pin 18), the conductor 204., 'The windings connected in series of the polarized relays 1A and 2A (fig. 19), conductor 205, frames sr2 and col (fig. 18), conductor 206, frame wa2 (fig. 19), conductor 207 leading to the central station, frame Xl (fig.



  .



  21), the armatures and sw4 1 ± the resistor 208 and the negative of the battery.

  <Desc / Clms Page number 77>

 



  To return to the substation equipment
 EMI77.1
 shown in fig19p it should be noted that the relay represented alone is to notice that the relay alone / polarizes 2A, is / excited on this circuit, and then closes to its armature 2al (figol?) an excitation circuit for relay L.

   Relay L operates etp at armature 1I; it closes a circuit for the delayed relay G (fig. 17) at frame 12 it closes an excitation circuit for the magnet
 EMI77.2
 SSM motor of the SSS commntaàear and to the armatures.! 3 and 1.4 (fig16) it prepares a circuit for the polarized relays 1 BP and 2 EP of the telegraphic unit of the substation (figo8) o Relay 6 attracts its armatures and to ar-
 EMI77.3
 mature & 1 "((fig17) it opens a point of the reset circuit of the switch SSSp to i + armature (fig.18) it opens a circuit point of the lower winding of the CO relay, etp to 1 + armature ( figol?)

     it opens a point
 EMI77.4
 of the Kg relay circuit while its armature e4 (freezes it closes an excitation circuit for a delayed tripping relay GA; this GA relay operates and opens at
 EMI77.5
 the armature equals another point of the reset circuit of the SSS switch while at armature 2 (fig-17) it prepares a circuit for relay K and, at armature ga3 (fig; 18), it prepares a circuit for the lower coil of the CO relay.

   For the moment, then, nothing else will happen at the substation until the control lever. tact a of the OSS switch (figo20) meets the second part of the multiple of common pads and thus completes each time relay U is energized the following pulse circuit da positive of the battery connected with the control lever.
 EMI77.6
 tact 4 by the second set of contacts connected in glultîe, ple, the armatures 1Y t2D the conductor 201 and from there by

  <Desc / Clms Page number 78>

 the line circuit traced previously, comprising the polarized relays 1A and 2A the the soas-station and returning to the negative of the battery by the resistor 208 of the station
 EMI78.1
 central station.e polarized relay 2A (fig;

  19t is called upon to respond to the pulses transmitted on this circuit to the armature u2, and since the relay L (fig.l7) will also work step by step with the relay 2A, the SSS control switch of the sub .- ,. station will start to advance step by step in synchronism with the CSS and MCS switches of the central station. Note that during the period of automatic progressive advance of the CSS switch the delayed relay Y will be maintained continuously energized in order to keep the 2H relay energized by its + i
 EMI78.2
 roea6.t higher.

   As soon as the contact arm la du. common CSS then meets the identified contact the SW relay will be energized, as in the previous example,
 EMI78.3
 so that â armature'2blil is interlocked with earth by its lower winding, A armature j3w the relay SW opens the motor circuit of the MCM magnet, so that the contact arms of the switch connects -
 EMI78.4
 The MGS meter will be kept connected with the desired mechanical meter ,, and at the sà2 (fig.20) and sw4 (fig.21) arwature the SW relay reverses the direction of the current pulses through the line circuit,

  so that
 EMI78.5
 the rostodes pulses emitted by the OSS switch will now intermittently actuate the polarized relay 1A of the sub-station instead of the relay 2 "By its operation, the relay 1A causes the relay 'AA (fig, 17) to respond intermittently to actuate the magnet! SCM motor by means of the armature aal (fig. 16),

   of

  <Desc / Clms Page number 79>

 
 EMI79.1
 so as to rotate the contact levers of the ses switch piograssively on the contact pads in accordance with the number of azmpg pulses aaxqaelles the relay lA responds To the armature aa2 the relay AA connects the positive of the battery via the The tier
 EMI79.2
 contact switch 4c to keep relay G (figol7) energized while it is preparing, to reinforcements aa (fig.l6Do and aa, 4.



  (figel7) a circuit for the polarized relay of the telegraphic equipment of the 6 substation The ses switch (fiv.16) therefore advances step by step in synchronism with the CSS switch which continues to @@ nncer in the same way from the central station until the contact levers 2a and 4a escape the contact pads connected in multiple.

   At this moment, the reciprocal action circuit of the relays U and V is open, so as to interrupt the motor circuit of the MCM magnet and the contact levers are therefore kept in their 23rd position. position the MR relay is actuated via contact x3 and thus prepares the mr2 and mr1 armatures for the circuit for the mechanical counter.
 EMI79.3
 that coupled with the measuring device N? 2 of the substation o On the mr3 and mr4 armatures the MR relay cuts all the connections of the battery ddavec.

   The end of the line circuit terminating at the central station, and connects the polarized receiving relays 1B and 2B and the high resistance relay T in series with the armament.
 EMI79.4
 ture stl across the junction lines, ready to receive the pulses from the substation corresponding to the meter indications
 EMI79.5
 As shown in figol6 and 17e, the SSS switch of the substation equipment located

  <Desc / Clms Page number 80>

 
 EMI80.1
 to its 4th position and the conutateL1X SCH to its 15th posi * - tiOU7 the following circuit is closed on the positive relay connected with the Viecontact l of the BTS switch (fig. 19) by the first contact pad of this one, conductor 209, frame rsr4,

     the contact arm. 1c and the fourth contact pad * the conductor 210, the 15th contact pad and the contact arm 2d of the ses switch, the armature attracted co4 and the winding of the relay M to the negative of the battery. Relay H, being energized on this circuit, connects the desired Midworth apparatus in a similar manner;

   to that described in the previous case and prepares for its armature h5 (fig. 18) a circuit for the high resistance relay J, which will only play a role later. It should also be remembered that the delayed relay G connected with the contact tahleatz acting in combination with the contact lever 4a has been kept energized continuously during the pulse period by
 EMI80.2
 the intermediary of the frame 11 and, later by the inter *. aa2 so that at the cassation of the JmptAsions the relay, 'mediary of i * arma'i: ure6-. will work at ,;

   the end of its tripping period, and then open, at armature 44 e, the guard circuit of the similar delayed relay GA (fig, 16), During the tripping period of this last relay, the CO relay ( fig. 18) is also energized on its lower winding. The CO relay, when operating, opens a new co3 armature, reset circuit point of the
 EMI80.3
 SSS switch (fig, 17) while with the coi and oor armatures (fig. 18) the line circuit is combined with the polarized relays 1A and 2A fig. 19) and is connected by the contacts
 EMI80.4
 maneuvered from the collar frame, and the frame. !! 5 "the high resistance relay winding ', the armature wl, the high resistance YGe the frame x ,, v jj,

   low resistance YE

  <Desc / Clms Page number 81>

 to the negative of the battery, while through the closed contacts of the co2 armature, the conductor 203 which is connected to the line conductor 202 is connected with the positive of the battery through the ±! 2 armature. In this way a circuit is established passing through line conductors 202 and 207 through which current is then sent from the substation to the central station.

   In this circuit, relay T alone is energized at the central station (fig. 21) and then closes on its armature t1 a locking circuit on relay 2M which acts when relay Y has tripped at the substation after its delay period Relay J (fi.go18) is also energized on the line circuit and maintains its armature j1 (fig. 18)

   the CO relay energized when the GA relay has tripped at the end of its delay period
Under these conditions the circuit is ready for sending to the central station the impulses necessary for the transmission of the indications of the measuring device and since the Midworth devices have been connected in the apt way already described / of the previous one. embodiment the relays K and D shown in the upper part of fig. 17 are operated alternately so as to produce the pulses as follows:

   Referring to fig. 18, it will be seen that the line circuit normally includes the high resistance YC which is sufficient to reduce the current on the circuit of the polarized relays 1B and 2B of the central station (figeai) to an insufficient value to act on said relays, so that only the Jet T relays are energized at this moment.

   When the reinforcements kl, and dl are then operated together

  <Desc / Clms Page number 82>

 as is the case with each movement of the Midworth transmitter, the haunting resistor YC will then be shorted, and the line circuit current will immediately rise to a value sufficient to energize said relays. Assuming then that the movement of the Midworth device occurs in a positive direction, a corresponding number of pulses will be transmitted to the central station by the line circuit described above to actuate the polarized relay 1B (fig. 21 ). The latter then transmits the pulses in the manner already described to the magnet A of the mechanical counter by means of the contact arm 2b of the MCS switch.

   If, on the contrary, the movement of the Midworth device occurs in a negative direction, the RV relay (fig. 17) will be energized by the contacts 72 of the motor shaft arm of the automatic transmitter which, we remember, is fixed, and under these conditions the current flowing on the line circuit is reversed at the rvl and rv2 armatures (fig, 18) so that the polarized relay will respond only to pulses of this nature to connect the magnet B of the meter mechanical.

   Once the measurement device has been read at the central station, its supervisor will return the appropriate key # 2 (fig, 13) to its rest position in order to return things to their normal state. The reset circuit of ± CSS and MCS switches is therefore closed as explained above, while the relay ST is also triggered to open the line circuit and cause the T relay of the line to trip. central station and relay J of the substation equipment.

   Triggering of relay T triggers relay 2H which at its

  <Desc / Clms Page number 83>

 turn triggers the Xo relay This then triggers the MR relay to bring the central station equipment back to its idle state
The relay J of the substation, by triggering at armature j1, the locking circuit of the upper winding of the CO relay which then trips in its turn and closes the mm "co3 armature of the circuit. resetting the switches SSS (figal?) and SCS (fig.16) in the known manner;

   thus bringing all the substation equipment back to its idle state With regard to reading the total load it should be noted that the method of selecting the desired connection from the central station is similar to that used in the case of a measuring device 'When the supervisor at the central station wishes to read the total load of the substation, he operates the TLK total load key (fig.13) thus locating the contact pad appropriate acting in combination with the contas lever! 1a of the CSS switch (fig. 20) which then pivots and transmits pulses to the substation in order to bring the SSS switches and its to their desired positions.

   Due to the particular arrangement of the contact levers of these switches, the SD relay (fig. 16) which is connected with the contact board acting in combination with the contact lever 3d will be actuated to connect the total load meter. in series with the automatic receiver which trance puts on the circuit traced above impulses to again energize the polarized relays 1B and 2B of the central station which in turn close the circuit of the magnets A and B of the corresponding mechanical counter con

  <Desc / Clms Page number 84>

 nected with the contact boards of the MCS switch which records the reading in the known manner.



   When the reading is duly recorded, the return of the TLK key of the central station to its rest position determines the return to the normal position of all the devices.



   The method for checking the indications relating to the switches of the substation will now be described and in this regard it should be noted that the positive mechanical locking devices of the substation relays and the mechanical locking devices of the station central unit are exactly similar to those described in the previous embodiment as they are shown in detail respectively by fig. 9 and 15.

   

  <Desc / Clms Page number 85>

 
 EMI85.1
 Suppose now that a switch of the substation is% driven to its closing position, the coil of relay ILG (figo9) will be energized in series
 EMI85.2
 with the OS relay (figfll8) o In this way the armatures of the coil j & are locked by means of the mechanical lock and the circuit of the relay CS is open :, to the normally-closed contacts acting in combination with the coils and , during the momentary excitement of the re-
 EMI85.3
 the positive of the battery is connected, to learmatt re C81 (fig ,, 19) p via the pads connected in aultiple COlliID # n and contact lever 4 ± of the BTS switch to actuate the RSR relay (figo18).

   This relay is then locked in 1 excited state on a closed AC circuit by means of its light armature rsr1 (freeze '
19 'As in the previous description in the event that a reading of a measuring device is in progress at this moment, priority must always be reserved for the indications concerning the switch and the special measures carried out for this purpose must necessarily be canceled) which takes place as follows g By energizing the RSB relay on the circuit described above, it is pre-
 EMI85.4
 ready for rsr2 frames (figol8)

   and rr µ (freeze19µ a circuit for the lower winding of relàs Sri and also for relay 1? e while at 1'matuxe 1'81'4 (freeze1?) the locking circuit for relay H is open.



  When triggered, relay H cuts off the Midworth device
 EMI85.5
 of the control equipment and oaure, to 1 "armature to 5 the line circuit to make the substation trigger the relay J andp at the central station 1 it relay T, in order to
 EMI85.6
 to bring back all the & ppreila of the two stations to

  <Desc / Clms Page number 86>

 their normal state
To return now to the substation (fig.



  17), when the contact levers of the SSS switch reach their rest position, the following circuit is closed on the SR relay to 1 energize: from the positive of the battery to the contact lever 1. ± ,, by the first pad switch contact switch BTS (fig. 19), conductor 209a, armatures co3, g1 and gal (fig. 17), contact lever 3 ± and its first contact pad, conductor 211, armature rsr2, and by the lower winding of the SR relay to the negative of the battery, while continuing along the conductor 211, a parallel circuit can be drawn by the armature rsr3, the first contact pad and the contact lever 2f of the BTS switch, the conductor 212, the armature el,

   and the winding of relay F to the negative of the battery .. By its operation, the relay SR prepares, with its armatures sr1 and sr2 (fig, 18), the pulse circuit for the equipment of the central station, while say that the relay F, by functioning formed in the armature f1 the circuit of a similar delayed relay E and, at ,, the armature f2 a circuit on a delayed relay CA.



   Since the relay E opens the circuit of the relay F, and the relay F when tripping opens the whole circuit of the relay E, it follows that the delayed tripping relays F and E act mutually on each other. the other and that the relay E activates the magnet of the BTS switch (fig. 19) through its contact e3 so as to make the contact levers of the BTS switch move on the contact pads, in order to record the position of switches and branch change switches.

   At the first excitement of the

  <Desc / Clms Page number 87>

 relay E by the circuit described this relay in addition to the energization of the magnet BTM, closes the following circuit on the central station to energize the polarized relay 1B; of. positive of the battery by the c1 armature (fig. 18), the e2, sr1 and co2 armatures, the coromducer 203, the wa3 armature, the conductor 202 leading to the central station, the armature x2, the polarized relays 2B and 1B in series, the armature m1, the manufacturer 207 which ends in the substation, the armature wa2, the conductor 206, the col armatures,

   sr2 and c2 and by the low resistance YE to the negative of the battery o The polarized relay 1B is only energized on this circuit and since under these conditions the MR relay of the central station is no longer energized, a. circuit going from the positive of the battery to the armature lb1 (fig. 21) by the armature mr1 and the winding of relay 1R to the negative of the battery is closed 0 Relay 1R when operating closes at l armature lr1 (figo21) an exci .... tation circuit on relay 1Z, to armature lr2 (fig.20)

   it connects the positive of the battery via the conductor 95 to excite the motor magnet CBM of the switch CBT (fig. 15) and to the armature lr3, it prepares a circuit through the conductor 97 to the lever of the contact 3g of the switch CBT (figo 15) which remains inactive at this time

  <Desc / Clms Page number 88>

 
To return to the substation (fig; 19), tripping of relay E will stop the excitation of magnet BTM in order to advance the contact levers of. BTS switch to. second set of contact pads and, during this time, tripping of polarized relay 1B at the central station will also cause the CBT switch to step synchronously forward (fig.15).



   It should be noted that the excitation of relay E for the first step is slightly prolonged by Inaction of the locking circuit formed by means of the armature drawn on relay cd1. This extension has been planned in order to leave the necessary time for the carrying out of the various switching operations which are essential at the start of the call which is to occur at the central station, in order to prepare the call. equipment thereof to receive the following pulses.

   In the second position of the BTS switch, the RST relay latching circuit is open; this rattle is then triggered and opens the primitive excitation circuit of relay F, but this relay is kept energized by the circuit passing through the contact arm 2 and the common multiple of contact pads so that the reciprocal circuit will continue automatically advancing the contact levers of the BTS switch on the contacts of their respective tables. As in. previous example, the presence or. the absence of potential encountered at the contact pads by the contact leversa and 7f causing the step-by-step advance of the switch indicates whether the corresponding switches are "closed" or "open".

   If they then encounter a disconnection corresponding to an "open" switch

  <Desc / Clms Page number 89>

 relay 1B will be energized again at the central station following the next energization of relay E, and will again cause relay 1R to energize.

   The latter therefore excites the CBM magnet (fig. 20) and brings, to its armature tr3 (figo2o) the mechanical locking relay 1LR (fig 15) to its correct position as explained previously, while 'at armature lr1, the excitation circuit is closed again on relay 1Z (figo21) o It should be noted that relay 1Z is provided with a copper weight so that it remains energized for period of the pulses and thus prepares the armature lzl a circuit for the relay 2R while at the armature 1z2 it energizes the relay 2Z2, which in turn opens at the armature 2Zl (fig.



  20) the CBT switch reset circuit (fig. 15) on the armatures 2z2 and 2z3 (figo21) the telephone circuit and prepared for armature 24 (fig. 20) the reset circuit for the switches CSS 'and MCS.



   Let us suppose then that in the following position of the switch BTS, the contact lever 3 @ encounters a pad connected with the positive of the battery and corresponds to a switch in the "closed" position; relay C will be energized in this case and will invert to armatures cl and c2 (figo18) the direction of current on the line circuit, so that at the following energization of relay E it will be transmitted at the central station a pulse of the opposite polarity to energize the opposite polarized relay 2B.

   By attracting its armature 2bl, relay 2B (freezes, 21) energizes relay 2R which, at its armature 2r1, keeps relays 1Z and 2Z energized, and connections} to armature 2r2, the positive of -The battery at

  <Desc / Clms Page number 90>

 conductor g5 to energize the motor magnet of the CET switch, while at the armature 2r3 it connects the positive of the battery via the conductor 215 to the contact arm. 5 ± of the CET switch (fig. 15) for actuate the appropriate LR relay and bring it to its desired position.



   The BTS switch of the substation continues its rotary movement as desired to bring the automatic relays of the central station to a position corresponding to that of the automatic relays of the substation, and when the switch has performed one revolution. complete, the contact lever 6f will leave the multiple of contact pads and thus open the circuit of the relay F so that the combined action between this relay and the relay E will cease and the contact levers of the. BTS switch are held in their rest position.

   Likewise, the corresponding CBT switch of the central station which had followed the movement of the BTS switch of the substation, will also be kept in its rest position, and the 1Z and 2Z relays will now trip. It should be noted that the relay CB (fig.21) which had been energized on its upper winding is now now locked on its lower winding with the positive of the battery via the conductor 89 leading to the. positive to the contacts of the recall key ARK * The relay CB, while operating, connects the positive of the battery to the driver @ 6 to turn on the PAL call light on the panel.

   (fig.15), and on the other hand connects the positive of the battery to the armature ch2 on the conductor 101 to activate the common alarm bell CAB (fig.15). As in description

  <Desc / Clms Page number 91>

 The CB relay closes a circuit for the reciprocal action of the delayed action relays DA and FB (fig. 21) which intermittently light up the various signal lamps assigned to the LR relays (fig. 15) in the event of a change. would have been carried out in the position of the respective switch since the previous checks were carried out
Suppose then that the CBT switch is malfunctioning or that it receives an incorrect number of pulses from the substation;

   the contact levers of the switches will not be in their rest position at the end of the pulse period so that a reset circuit will then be closed by the intermediary of the magnet CBM motor in series with the low resistance lower winding of the RP relay (figo20) as follows from the battery negative through the CBM magnet, the switch contacts c @@@, the conductor 104, the winding lower part of the RP relay, the conductor 103, the multiple and the common contact arm of the contact pads / 1g or 6g, as the case may be, the conductor 112, the contact 2z1, to the positive of the battery,

   The RP relay is energized and locked on its upper winding by means of the pads connected in common multiple cooperating with the contact lever 2a of the switch CSS, and by the armature 2z4, and the armature rp2 to the positive of the drums.

   The RP relay while functioning reproduces the state of the meter button by locating an appropriate contact pad acting in combination with the contact arm of the CSS switch, and the necessary pulses are then transmitted to the central station to adjust the position. SSS switches and its like

  <Desc / Clms Page number 92>

 In this way, the relay, by drawing its armatures, will switch on the positive of the battery by means of the contact lever 3d (fig.l6) on the conductor 219 to re-energize the RSR relay (fig.18).

   This relay is immediately twisted on the circuit described above and causes the switch BTS to execute another complete revolution to retransmit the indications relating to the switches to the central station. The system also includes devices for controlling branch change switches, but since the operation of this special feature of the object of the invention is readily understood from the foregoing discussion a detailed description will not be given here.



   Considering now the telegraph equipment when it is desired to transmit to the substation a definite and predetermined instruction, the appropriate spring set, shown in fig. 13, will be actuated by means of the rotating arm of the telegraph by bringing the one here in its appropriate position. As a result, a contact pad connected with the contact lever 1a of the SSS switch, (fig. 20) will be marked and in accordance with this identification a determined combination of pulses will be transmitted to the substation to bring it there. the SSS and CES switches to the desired position.

   Since, in the particular case described, the combination of pulses is such that the contact lever 20 of the SSS switch (fig. 17) is engaged during its rotation on the multiple ccmmun of the contact pads of the polarized relays 1EP and 2EP of the telegraph equipment of the sound-station (fig. 8) will be actuated so as to bring the THS and TCS switches of this equipment to a determined position to light the lamp

  <Desc / Clms Page number 93>

 corresponding signal and thus indicate to the supervisor of the substation the instruction which has just been transmitted by the central station, In these conditions the relay H (fig. 16), 2TG (figol7)

     and 1T @ (figo18) will be excited in series and by the attraction of reinforcements h5 and 2fg (fig.



  18) a circuit will be established by the line to the central station to actuate the polarized relay 1B there, and since at this moment the relay MR is energized, a circuit can then be drawn from the positive to the armature 1bl ( fig. 21) by 1 armature mr1, the rest contacts of the armature sg1 the conductor 11%, the working springs actuated ONS of the telegraph equipment of the central station (figo 13), the conductor 116, the winding of the SG relay (fig. 20: to the negative of the battery.

   Relay SG is then energized on the circuit described and establishes at its closing and then breaking armature sgl which has been attracted, a locking circuit independent of contact lb1, at its armature sg2 (figo21) the SG relay prepares a circuit for activating the common alarm bell and connects, to its armature attracted sg3 the positive of the battery to conductor 117A to light the lamp of the telegraphic equipment (fig. 13), assigned to the position of the rotating arm,

   to indicate that the signal has now been received at the substation The substation supervisor seeing the signal lamp of his telegraph equipment on will then bring the rotary arm to a corresponding position and thus open the interlock circuit 1TG, H and 2TG relays. Relay H opens, by tripping, at its armature. 45 the circuit of the line between the substation

  <Desc / Clms Page number 94>

 and the central station, so that the relay T of the central station will trip and open the 2H relay interlock circuit which in turn trips the X relay to trip MR.

   But since the SG relay is now locked in the energized state through the working springs of the telegraph equipment, the following circuit will be established to activate a common alarm bell: the battery to the mr5 armature (fig.21) by armature 2 the conductor 117, the springs actuated ONS (fig.13) the conductor 101 and the common alarm bell CAB fig.15) to. battery negative. In this way the central station supervisor @ responds to a signal to warn him that the on.

   making sure the substation has responded correctly to the transmitted signal, and it will then return its telegraph switch to the normal position to trigger all circuits connected to it *
A description will now be given of the telephone link established between the central station and the substations:

   
When the supervisor of the central station wishes to speak to the supervisor of a substation, he will momentarily operate the appropriate telephone button TPK (fig.lj corresponding to the station called. The positive of the battery connected with the set. Of upper springs will then be connected to the conductor 118 to energize the TC relay (fig, 21) which is then locked in the excited state by means of its armature tc4 with the positive of the battery at the armature mr5, regardless of the circuit drawn previously.

  <Desc / Clms Page number 95>

 



   In the armature tc3 (figo2l) is also prepared a circuit for the relay TR, in the armature such (fig.10) a determined contact pad acting in combination with the contact lever la is identified by its connection. with the battery positive and at the armature tc2 (fig. 10) the excitation circuit of the ST, X and Va relays is closed As has already been said, the excitation of the U relay acts alternately with the relay V to operate the CSS and MCS switches and rotate their contact levers on the contact pads of their respective boards in order to transmit the desired combination of pulses to the substation, in order to further. set the contact arms of the SSS and SCS switches to complementary positions,

   in which the relay TE is energized and locked by means of its armature te5 with the positive of the battery at the rest armature n5. By operating the relay TE opens the armature such (fig. 17) the locking circuit of relay H and connector. from, to the armature te3 (fig. 19) the negative of the battery by the resistor 225, the armature n2, and the springs SW- of the telephone receiver hook to complete a circuit of the ringing telephone of the telephone of the sure. watching over the substation,

   while at the drawn armatures te2 and te4, relay N is connected straddling the telephone conductors to supply the circuit with the battery
When the substation supervisor then picks up his receiver to answer the call the ringing circuit is interrupted at the springs of the receiver suspension hook and the transmitter and the receiver.

  <Desc / Clms Page number 96>

 
 EMI96.1
 receiver are connected in series to the c-i cuzt of the Ii ....-
 EMI96.2
 .receiver such that relay N will now attract
 EMI96.3
 its reinforcements so that the re through its reinforcements and to lock by liappa-o its nl and n2 reinforcements on the closed circuit by 11appa- rem! telephone, while its B5 frame (fig. 17)

   it opens the guard circuit of the TE relay (fig. 16) opens To return then to the station of the central station, it will be remembered that by the final displacement of the contact levers of the a ou3matate = CSS to their 23rd position , the UR relay is energized and opens the circuit to the TC relay on its armature 5 (fig. 21) oThe TC relay t is then triggered and closes, in the manner 6 already described, the circuit for returning to the rest position on the commll GSS circuit and 'G.

   It should also be noted that when as a result of the excitation duela3.a H at the sub-station the following 116xeltation to SCS arrive the control levers of the controllers SSS SCS arrive their voaluel position, the line circuit has been closed to the 1 armature e to ensure to the central station the excitation of the relay T which then connected to the ar atQ1'e tol the positive of the battery via the arm p to energize the relay TR on its winding mature.t - 03 so that this relay can then be connected via its armature trl in the closed state to the positive of the battery by means of the cond \ lc tor 120, and the lower rest springs â, e the TPK telephone key ifig13)

  Being energized on the circuit described - the relay TB connects to its armature 2 the positive of the battery by the driver t7 to activate the common call bell CAB (fig-15 1 will announce under these conditions to the supervisor of the central station that

  <Desc / Clms Page number 97>

 his call has been received at the substation o The central station supervisor then brings the TPK telephone button (fig. 13) to the answer position for a moment
 EMI97.1
 in order to trigger the TR relay latch circuit and cut the common call ringing circuit, and since its telephone circuit terminates in a plug and a cord, its plug can be inserted into the appropriate jack 121, by example the one indicated in
 EMI97.2
 fig. 13 to complete the following conversation circuit:

   the upper spring of the jack z (figo13) p the conductor 122 the armature 2z2 (freeze the armaturo Zlo té conductor 20Z leading to the son-station, the rest armature 2 (freezes the conductor 206 the eondensatear PO, the armatures A3 and 2p the transmitter and the receiver in series, of the supervisor of the submstat.mng the armature 4 the capacitor PD the conductor 20 the armature wa3 (fig. 19) the conductor 2,0,2 leading to the central station 1 #, ll * the "atilre x2 (figo21)

    the 210p armature the driver to the lower springs of the .l6 jack! (ìg13
At the end of the conversation the supervisor of the substation will hang up his receiver and the supervisor at the central station will remove his plug from the jack and all the circuits established previously will be returned to their normal state.
Now suppose a call in the opposite direction
 EMI97.3
 cest.yd.ire from the substation to the central station; the following circuit maneuvers will then occur:

   When the substation supervisor picks up his receiver in the common manner to make a call, relay W (fig. 19) is energized on its two windings by

  <Desc / Clms Page number 98>

 the following circuit: from. positive of the battery by the contact arm lf and the first contact pad of the switch
BTS, conductor 209, armature rsr4, upper winding of relay W, armatures n1 and ca2, trans motteux and receiver in series, armatures n2 and te3 the lower winding of relay W to the negative of bat <laughs.

   Relay W is therefore energized on the circuit described and opens, at its armature w1 (fig. 18) a point of the circuit of relay J while at its armature! 3 (fig. 19) it opens the circuit for the relays switches of fig. 9, and to its armature w2 connect the positive of the battery via the. contact arm 1c and from its first contact pad (fig.l) to the winding of a similar WA delayed relay. By attracting its wa1 armature, the WA relay causes the N relay (fig. 19) to be energized by its upper winding and this relay is then connected, to its n1 and n2 armatures, in series with the telephone circuit, while 'on' rear contacts of the said armatures it opens the guard circuit of relay W.



   By tripping s relay W in turn opens the guard circuit of relay WA and during the period of delayed tripping of these relays, the following circuit is established.
To actuate the polarized relay 2B at the central station: the negative of the battery, the low resistance YE (fig. 18) the conductor 230 the drawn contacts wa3 (fig. 19) the * conductor 202 leading to the central station, the armed. ture X2, the winding of the polarized relays 2B and 1B in series, the armature xl the conductor 207 leading to the sub-station me armature wa 2 and the battery positive, Relay 2B is the only one energized on this circuit and connected,

   to its frame 2bl the positive of the battery via

  <Desc / Clms Page number 99>

 mr 2 and 1Z1 reinforcements, to the lower covering of. TR relay and to the battery negative this relay can then operate and connect by its upper winding on a circuit which has been traced above to the battery positive at the TPK button (figo14) of the telephone equipment. By attracting its armature tr2 (fig. 21) the relay TR connects the positive of the battery to the conductor 101 to activate the common call bell CAB (fig. 15) and connects in parallel with its locking winding. lage, the positive of the battery to its armature tr1 on conductor 126 to switch on the lamp = TCL signal from the telephon (fig.13).

   The call bell and the lighting of the lamp indicate to the supervisor of the central station the particular substation which is calling $ he will then insert his telephone plug into the jack corresponding to the lamp to establish a conversation circuit with the supervisor of the substation and at the same time brings his telephone button TPK to the position corresponding to the call in order to trigger the relay TR.



   When the conversation is over, the supervisor of the central station will remove his plug from the jack and the supervisor of the Mud-station will hang up his receiver. tor, thus triggering relay N and all the equipment will then return to its resting position.


      

Claims (1)

ABSTRACT A device for transmitting indications of measuring devices, telegraph signals and telephone messages from one station to another on the same pair of electrical conductors or on an equivalent device, characterized in that: 1) the special nature of the communication to be transmitted is defined by the prior transmission of pulses corresponding to a determined code 2) the pulses comprise a determined number divided into groups fixed in advance, 3) the communication itself is stupid. tituated by a determined number of pulses which is divided into groups fixed in advance, 4) the pulses of the first cycle consist of a current of a specific acoustic frequency, while the pulses of the second cycle consist of currents of a different acoustic frequency,