EP1505620A2 - Steuervorrichtung mit Motor für Niederspannungsschalter. - Google Patents

Steuervorrichtung mit Motor für Niederspannungsschalter. Download PDF

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Publication number
EP1505620A2
EP1505620A2 EP04077048A EP04077048A EP1505620A2 EP 1505620 A2 EP1505620 A2 EP 1505620A2 EP 04077048 A EP04077048 A EP 04077048A EP 04077048 A EP04077048 A EP 04077048A EP 1505620 A2 EP1505620 A2 EP 1505620A2
Authority
EP
European Patent Office
Prior art keywords
servomechanism
motorized control
rotation
coupling lever
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04077048A
Other languages
English (en)
French (fr)
Other versions
EP1505620B1 (de
EP1505620A3 (de
Inventor
Claudio Ascari
Franco Colombo
Carlo Morlacchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB SpA
Original Assignee
ABB Service SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Service SRL filed Critical ABB Service SRL
Publication of EP1505620A2 publication Critical patent/EP1505620A2/de
Publication of EP1505620A3 publication Critical patent/EP1505620A3/de
Application granted granted Critical
Publication of EP1505620B1 publication Critical patent/EP1505620B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/66—Power reset mechanisms
    • H01H71/70—Power reset mechanisms actuated by electric motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
    • H01H2003/266—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor having control circuits for motor operating switches, e.g. controlling the opening or closing speed of the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/66—Power reset mechanisms
    • H01H2071/665—Power reset mechanisms the reset mechanism operating directly on the normal manual operator, e.g. electromagnet pushes manual release lever back into "ON" position

Definitions

  • the present invention relates to a motorized control to be used preferably for the remote actuation of low-voltage electrical switches.
  • motorized controls are by now widely used for the remote control of devices designed in particular for circuit breaking or for handling of electrical networks, such as, for example, switches, disconnectors, or isolators.
  • Devices of this sort are often located in positions that are difficult to access for the operator who has the task of handling the electrical networks and call for the need on the part of the operator to carry out troublesome and sometimes dangerous manoeuvres and movements for guaranteeing actuation thereof. It appears therefore evident that the use of motorized controls which can be remotely controlled enables a considerable reduction in the dead times involved in the manoeuvres and movements of the operator, at the same time providing the possibility of performing, via a single control unit, actuation of a number of devices almost at the same time.
  • the motorized control is obtained through an electric motor governed by a control logic associated thereto. Following upon turning of the motor, corresponding kinematic mechanisms for transmission of the motion lead to the rotation of a control lever connected at one end to the actuation knob of an electrical switch.
  • the motorized control through the control logic, is called upon to set the switch in the circuit-closing condition, then the motor starts up and begins to rotate the control lever until the position is reached in which a first end-of-travel of the closing mechanism goes into action.
  • control logic issues a command for reversal of the direction of turning of the motor, which, by turning in the opposite direction, disengages the control lever until a second end-of-travel mechanism goes into action, which blocks the motor when the position of disengagement is reached.
  • the reverse opening operation occurs substantially in the same way.
  • the main task of what forms the subject of the present invention is to overcome the drawbacks mentioned above and, in particular, to provide a motorized control which will enable a correct and effective actuation of switches commonly used in low-voltage electrical lines.
  • a first purpose of the present invention is to provide a motorized control in which the movement of the switch will be based upon a simple and reliable control logic.
  • a further purpose of the present invention is to provide a motorized control, moving of which will be performed through a reduced number of components which may be easily coupled together in the assembly step.
  • the motorized control 1 for low-voltage switches basically comprises a servomechanism 10, a control unit 20, and a coupling lever 30, which is, at the same time, associated to the servomechanism 10 and to the switch to which the motorized control 1 is applied.
  • the coupling lever 30 can be advantageously associated to the actuation knob of the switch to simulate in this way what occurs in a traditional manual actuation.
  • the motorized control is characterized in that the control unit 20 generates a first impulse signal, which constitutes a command for the servomechanism 10 to perform a first rotation with pre-defined direction and amplitude, and generates a second impulse signal, which constitutes a command for the servomechanism 10 to perform a second rotation, which is also with pre-defined direction and amplitude.
  • the first and the second pre-defined rotations are performed so as to have a substantially coincident amplitude and opposite directions.
  • the servomechanism 10 in effect sets in motion the coupling lever 30 between a first pre-set position and a second pre-set position, and vice versa. Since these two positions are characteristic, respectively, of a circuit-opening condition and of a circuit-closing condition, it may be noted how the traditional manual action will thus be perfectly simulated.
  • the servomechanism 10 principally comprises a control unit 12 that governs an electric motor 11, which is connected to the coupling lever 30 and is dedicated precisely to obtaining the first and the second pre-defined rotations.
  • control unit 12 by encoding at input said first impulse signal or said second impulse signal sent by the control unit 20, sends, at output, a command to the electric motor 11 to perform the first rotation or the second rotation.
  • the servomechanism 10 further comprises transducer means 13 designed to supply to the control unit 12 a signal indicating the angular distance covered by the electric motor 11.
  • the control unit 12 in fact supplies to the electric motor 11 a power proportional to the angular distance that must be covered thereby to complete said first rotation or said second rotation.
  • transducer means 13 also enables a proportional control of the speed of turning of the electric motor 11.
  • the latter in fact, can advantageously turn with a speed so much greater or so much smaller as greater or smaller is the angular distance that must be covered to complete the first rotation or the second rotation.
  • the motorized control 1 further comprises disengagement means 40 designed to release the coupling lever 30 from the servomechanism 10.
  • These disengagement means 40 are necessary to enable the coupling lever 30 to be free to move until completion of the first pre-defined rotation or the second pre-defined rotation is obtained. This condition is essential, for example, to enable a possible manual actuation of the switch or to enable the switch itself to trigger in order to carry out its function of protection in the case of poor operation of the network.
  • the disengagement means are associated to the servomechanism 10 and are activated through a third impulse signal sent to the servomechanism 10 itself by the control unit 20.
  • control unit 20 comprises appropriate means 22 for generation of the impulse signals referred to above, as, for example, may be traditional generators of square waves. Via the use of these electronic components, the control unit 20, according to the invention, generates impulse signals which have one and the same frequency but a different time duration of the impulses.
  • the control unit 12 of the servomechanism 10 decodes the signals at input sent by the control unit 20, recognizing precisely the different durations of the impulses and issuing accordingly a command to the electric motor 11 for performing the first rotation or the second rotation, or else issuing a command for activation of the disengagement means.
  • Handling of the activity of the control unit 20 by the user can advantageously be performed through the use of traditional remote-control devices, such as radio transmitters, or else via the use of simple pushbuttons 300, electrically connected to the unit itself, as represented schematically in Figure 1.
  • the control unit 20 can operate via a power-supply unit 24, which supplies a supply voltage of 6 V.
  • This voltage value enables limitation of the number and dimensions of the energy-accumulation means 23; the latter are necessary in order to provide the energy necessary for the completion of the rotations referred above in the case of sudden absence of the main power supply.
  • Said task must be pursued ensuring normal modes of operation, i.e., guaranteeing, for example, the same speed of rotation of the coupling lever 30 that usually characterizes normal operation of the motorized control 1.
  • This aspect appears particularly important for preventing onset of dangerous electric arcs between the contacts of the switch, for example in the case of low speeds of rotation of the coupling lever 30, i.e., of the actuation knob of the switch itself.
  • Figures 3a, 3b, 3c and 3d regard a first preferred embodiment of the motorized control 1 according to the invention, which envisages a movement of the coupling lever 30 through a rotation about an axis substantially parallel to the axis of rotation of the servomechanism 10.
  • the motorized control 1 comprises a first supporting structure 50 for housing the servomechanism 10 and possibly the control unit 20.
  • the supporting structure 50 comprises a resting base 51, a first surface 52, and a second surface 53.
  • the first surface 52 develops in a direction substantially orthogonal to the resting base 51, whilst the second surface 53 develops in a direction orthogonal to the first surface, projecting in a raised and opposite position to the resting base 51.
  • the resting base 51 and the second surface 53 comprise first means 55 for the anchorage of the servomechanism to said first supporting structure, as, for example, may be ordinary screw connections.
  • the resting base 51 further comprises second anchoring means 56 designed to enable connection of the motorized control 1 to a possible outer containment casing 200.
  • Figure 3b shows the disengagement means 40 used in this first possible embodiment of the motorized control 1.
  • they comprise a toothed flange 41 fixed to the shaft of the servomechanism 10 and positioned at one end part of its own.
  • rotation of the coupling lever 30 is performed through the use of a first turning pair and of a second turning pair.
  • said first turning pair comprises a first bushing 70, which is inserted in a first seat 72 obtained on said first surface 52; the bushing 70 is geometrically conjugated to a pin 73 obtained on a first end 75 of the coupling lever 30.
  • the second turning pair comprises, instead, a second bushing 80, geometrically conjugated to a second seat 81 obtained on a second end 85 of the coupling lever 30.
  • the second bushing 80 is fitted on the toothed flange 41.
  • An alternative to the latter solution envisages a possible fitting of the second bushing 80 on the servomechanism 10.
  • the control unit 20 by generating, for example, the first impulse signal, sends a command to the servomechanism 10 to perform a first pre-defined rotation, which is considered, purely by way of illustration, counterclockwise.
  • the servomechanism 10 hence turns in a counterclockwise direction, thus leading to the rotation of the toothed flange 41 fixed thereto.
  • Said toothed flange 41 through one of its projections 42, leads to the rotation of the coupling lever 30, which turns in a counterclockwise direction about the axis of rotation provided by the first turning pair and the second turning pair.
  • the control unit 20 Upon completion of the rotation, if the control unit 20 continues to generate the first impulse signal, then the toothed flange 41 maintains the position reached, preventing any movement of the coupling lever 30. This occurs in so far as upon persistence of the first impulse signal at input, the control unit 12 for driving the servomechanism 10 sends a command to the electric motor 11 for absorption of an amount of electric power such as to counter any external action exerted on the coupling lever 30, an action which, in effect, in these conditions would tend to modify the position of the shaft of the motor itself.
  • the control unit 12 sends a command to the electric motor 11 for a rotation of the shaft in a clockwise direction, which is hence such as to disengage the toothed flange 41 from the coupling lever 30, bringing it, in effect, into a position which can be defined as neutral.
  • the coupling lever is able to move freely since it is not being blocked in any way by the toothed flange 41.
  • Figures 4a, 4b, 4c and 4d correspond to a second preferred embodiment of the motorized control 1 according to the invention, which envisages, in this case, a movement of the coupling lever 30 via a rotation about an axis substantially orthogonal to the axis of rotation of the servomechanism 10.
  • the motorized control 1 comprises a second supporting structure 90 dedicated, also in this case, to housing the servomechanism 10 and possibly the control unit 20.
  • This second containment structure comprises at least one third, bottom, surface 91, one fourth, side, surface 92, substantially orthogonal to said third surface 91, and one fifth, side, surface 93, substantially orthogonal to said third, bottom, surface 91 and opposite to said fourth, side, surface 92.
  • the supporting structure can be completed through a sixth, front, surface 94, a seventh, rear, surface 95 and an eighth, top, surface 96 so as to create a complete containment box of a substantially prismatic shape, as appears clearly from Figures 4a and 4b.
  • the bottom surface 91 may moreover advantageously comprise also third anchoring means 97 for fixing of the motorized control 1 in the proximity of the corresponding switch to be actuated.
  • the motorized control 1 comprises appropriate transmission means dedicated to transferring motion from the servomechanism 10 to the coupling lever 30.
  • these transmission means comprise basically a first gear 100 and a second gear 101, which are associated, respectively, to the shaft of the servomechanism 10 and to a second shaft 105 substantially orthogonal to the axis of rotation of said servomechanism 10.
  • the second gear and the second rotation shaft 105 can be made in a single piece in order to decrease the number of components and thus favour the assembly operations.
  • the motorized control 1 comprises a third turning pair and a fourth turning pair, which are designed to enable rotation of the second gear 101 referred to above.
  • said third turning pair advantageously comprises a third seat 110 obtained on said fourth, side, surface 92 and geometrically conjugated to a third end of said second shaft 105;
  • the fourth turning pair instead, comprises a fourth seat obtained on the aforesaid fifth, side, surface 93 and geometrically conjugated to a fourth end 113 of said second shaft 105.
  • the invention envisages the possibility of using spacer means 150 fitted on the second shaft 105, which advantageously increase also the flexural stiffness of said shaft.
  • the disengagement means may comprise the aforesaid toothed flange 41, which is advantageously fixedly connected to the second shaft 105 so as to perform its function according to modalities similar to the ones described previously.
  • the servomechanism 10 has, in fact, a shaft 250 of the electric motor 11 that is substantially vertical and no longer horizontal as the one illustrated, for example, in Figure 3b and corresponding to the first embodiment referred to above.
  • the technical solutions adopted for the motorized control enable the pre-set tasks and purposes to be fully achieved.
  • the system of movement of the coupling lever proves reliable and is obtained with a reduced number of components such as to enable a reduction in the final costs and such as to facilitate the assembly operations.

Landscapes

  • Mechanical Control Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Switches With Compound Operations (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Electric Motors In General (AREA)
EP04077048A 2003-07-22 2004-07-15 Steuervorrichtung mit Motor für Niederspannungsschalter. Expired - Lifetime EP1505620B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000041A ITBG20030041A1 (it) 2003-07-22 2003-07-22 Comando motorizzato per interrutori di bassa tensione.
ITBG20030041 2003-07-22

Publications (3)

Publication Number Publication Date
EP1505620A2 true EP1505620A2 (de) 2005-02-09
EP1505620A3 EP1505620A3 (de) 2007-03-07
EP1505620B1 EP1505620B1 (de) 2011-12-14

Family

ID=33548831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04077048A Expired - Lifetime EP1505620B1 (de) 2003-07-22 2004-07-15 Steuervorrichtung mit Motor für Niederspannungsschalter.

Country Status (4)

Country Link
EP (1) EP1505620B1 (de)
AT (1) ATE537547T1 (de)
ES (1) ES2380544T3 (de)
IT (1) ITBG20030041A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20100205A1 (it) * 2010-04-30 2011-10-31 Bticino Spa Apparato elettrico di riarmo associabile ad un dispositivo di protezione per effettuarne il riarmo automatico
ITBG20110034A1 (it) * 2011-08-01 2013-02-02 Abb Spa Dispositivo di comando per la richiusura di un interruttore in bassa tensione.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5834997A (en) * 1996-08-23 1998-11-10 Square D Company Coupling member for securing a spring to a rotatable motor shaft
IT1291610B1 (it) * 1997-04-18 1999-01-11 Bticino Spa Gruppo elettrico con dispositivo di azionamento per un interruttore

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20100205A1 (it) * 2010-04-30 2011-10-31 Bticino Spa Apparato elettrico di riarmo associabile ad un dispositivo di protezione per effettuarne il riarmo automatico
EP2383766A1 (de) * 2010-04-30 2011-11-02 Bticino S.P.A. Elektrische Rückstellvorrichtung, geeignet zum Anschluss einer Schutzvorrichtung zur automatischen Rückstellung derselben
ITBG20110034A1 (it) * 2011-08-01 2013-02-02 Abb Spa Dispositivo di comando per la richiusura di un interruttore in bassa tensione.
WO2013017595A1 (en) 2011-08-01 2013-02-07 Abb S.P.A. Low voltage circuit breaker with a control device for re-closing said low voltage circuit breaker
US9734974B2 (en) 2011-08-01 2017-08-15 Abb S.P.A. Low voltage circuit breaker with a control device for re-closing said low voltage circuit breaker

Also Published As

Publication number Publication date
EP1505620B1 (de) 2011-12-14
ITBG20030041A1 (it) 2005-01-23
ATE537547T1 (de) 2011-12-15
ES2380544T3 (es) 2012-05-16
EP1505620A3 (de) 2007-03-07

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