JPH1032943A - Uniterruptible switching system between defferent power supplies - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent, for example, a generator from being damaged by eliminating reporting between a tentatively installed switcher side and a generation device by a person and providing an interlock mechanism for preventing asynchronous throwing in an uninterruptible switching system between different kinds of power supplies by witching power supplies between a substation for distributing power and a mobile generation device with a parallel operation function by synchronizing both power supplies guide from both terminals of the tentatively installed switcher. SOLUTION: A tentatively installed switcher 64 incorporates potential transformers PT1 and PT2, synchronization is examined by the voltage of a transformer, the establishment of the synchronized closing enable conditions of the tentatively installed switcher 34 is judged by a synchronized closing enable judging circuit 35. When the above conditions are not established, a synchronization signal is transmitted from a synchronization signal transmission device 36 to a synchronization signal reception device 32 of a generating device 33, for example, by radio, a synchronization control device 19 control synchronization operation automatically, a relay LC is energized and a switcher closing disable cancellation coil LS is excited, and the switcher 34 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily stopping a load downstream of a construction section by using a power supply auxiliary power supply different from a normal power supply when a power outage construction is performed in a section of a commercial distribution line. The present invention relates to an uninterruptible power switching system between different power supplies when a power failure is relieved.

[0002]

2. Description of the Related Art FIG. 10 shows a schematic configuration of a conventional uninterruptible power switching system between different power sources. In FIG. 10, 1 is a distribution substation, 2 is a commercial high-voltage distribution line, and 3a and 3b are distribution lines 2. The interposed pole switch 4 is an uninterruptible rescue load group. In the distribution line 2, the section between the distribution substation 1 and the pole section switch 3a is a direct substation section, the section between the pole section switches 3a and 3b is a power cut section, the pole section switch 3b and the uninterruptible rescue load. The interval between the vehicle and the group 4 is defined as an uninterruptible rescue section. In addition, the location shown on the pole section switch 3b may be a temporary line opening portion (a portion that is cut and then reconnected) in an edge turning line portion or the like.

Prior to the blackout work, a temporary switch (commonly referred to as “construction switch”) 5 is mounted on a distribution pole provided with a sectional switchgear 5.
Are connected to each other via hot-line connecting portions 7a and 7b, connecting cables 6a and 6b, and bushings 8a and 8b with power detection terminals. Further, a synchronization confirmation device 9 is temporarily attached below the power distribution pole, and is interconnected to signal detection terminals of the main circuit bushings 8a and 8b of the temporary switch 5 by a signal cable. In addition,
11 is a synchronization verification means, and 12 is a synchronization confirmation switch.
The detection terminal is a connection cable 6 connected to a bushing.
When the terminals a and 6b are in a charged state, the detection terminals (electrodes) generate a low-voltage level potential by the voltage dividing operation of the capacitor, and the synchronization confirmation device 9 functions by detecting the potential signal of each bushing. Let me.

[0004] Therefore, at the start of this work, first, the above-mentioned devices are mounted, the temporary switch 5 is closed, and the pole section switch 3b is opened. In general, the opening / closing operation of the temporary switch 5 is performed by operating a handle with an attached drawstring.

[0005] In FIG. 10, reference numeral 13 denotes a hot-line connecting portion 7.
c, a mobile power generator with a parallel operation function as an auxiliary power supply connected to the distribution line 2 via the connection cable 6c and the connector 14; the mobile power generator 13 includes a prime mover (PM) 15; A main circuit section including a generator (AG) 16, an AC circuit breaker 17, and a disconnecting switch 18, a synchronous control device 19, an automatic voltage regulator (AVR) 21, a voltage setting device 22, a speed setting device 23, and a speed control device. (GOV)
24.

[0006] Next, the mobile power generator 13 with the parallel operation function, which is live-connected to the load side of the pole section switch 3b, is started, and the synchronous control device 19 controls the power generation side to be synchronized with the power distribution system. Then, they are supplied in parallel by the AC circuit breaker 17. Thereafter, when the temporary switch 5 is opened, the power supply 13 continues to supply power to the uninterruptible rescue load group 4.
In the meantime, if the pole section switch 3a is also opened, a power failure between the switches 3a and 3b of the distribution system can be performed.

[0007] After completion of the construction work on the distribution line side, the pole section switch 3
When a is input, the power distribution system is restored to the power supply side of the temporary switch 5. At this point, the synchronization verification means 11 (S
In Y), the synchronization verification of the power supply butting point is performed by visual confirmation. When the frequency difference is large, the rotation speed is adjusted by operating the mobile power generation device 13 while visually checking the synchronization verification display, to drive to the specified frequency difference (determined by the slow speed of the phase difference change), If the temporary switch 5 is closed near the synchronization point (phase difference ≒ 0), it is possible to switch back from the power generation side to the power distribution system side without interruption.

[0008]

In the system configured as described above, after the completion of the work on the distribution line side, the power supply on the distribution line is restored to the power supply side terminal of the temporary switch 5 while the main circuit is open. At this point, since the power supply on the generator (13) side is applied to the switch load side terminal of the switch, the synchronization check device 9 checks the frequency difference and the phase difference between the two power supplies, and performs synchronization. A frequency adjustment (rotation speed adjustment) operation on the mobile power generation device 13 side is required. The operation of the power generator (13) at this time is a manual operation (by a frequency increase or decrease switch or the like) while visually checking the synchronization verification means 11 of the synchronization confirmation device 9.

For this reason, when the place where the synchronization confirmation device 9 is temporarily mounted and the power transmission place (parking place) of the mobile power generator 13 are slightly separated (usually about 10 to 50 m apart), an operator is arranged on both sides and a transceiver is provided. For example, it is necessary to send messages to each other, which requires human labor and only verbal communication between both parties is required, making it difficult to perform reliable frequency adjustment work.

Further, since the voltages applied to the power supply side and the load side terminals of the temporary switch 5 are taken into the synchronization confirmation device 9 via the voltage detection terminals (8a, 8b), the voltage phase comparison between the two is easy. However, since the voltage value itself has a large detection error, both voltage values cannot be compared and confirmed. That is, for synchronization between different power sources, it is necessary to (1) adjust the frequency, (2) adjust the voltage phase, and (3) adjust the voltage value. In this case, the synchronization between different power supplies is performed without confirmation. Originally, the power supply on the distribution system side has a voltage fluctuation element of about ± 5% of the nominal voltage, and it is easily assumed that the restored voltage is different from the voltage before switching. Therefore, the synchronous power-on between different power sources, for which the voltage adjustment is omitted for the sake of convenience, may cause excessive invalid cross current between the two power sources at the moment of power-on, and may particularly cause damage to the power generator side.

As described above, in the prior art, the power transmission between the two devices (9, 13) is performed manually and
On the other hand, the phase difference is driven manually by the manual operation, and the input operation is performed with the pulling string of the temporary switch 5 while visually checking with the synchronization checking device 9 side. In this case, the phase difference is greatly shifted as a result of an operation delay due to a manual pull operation or a sudden change in the load on the power generating device 13 (generally, the allowable value of the phase difference input is said to be within ± 10 °). Erroneous input (asynchronous input), and depending on the degree thereof, excessive cross current may cause fatal damage, especially on the power generator 13 side, which is a desirable system from a safety point of view. hard.

Further, the greatest disadvantage of the conventional uninterruptible power switching system between different power supplies is that when the "on" operation is performed by the pulling string of the temporary switch 5, the machine is in a state other than a state where it can be electrically synchronized. There is a system in which an interlock mechanism that makes it impossible to make an automatic insertion cannot be incorporated in the system (an interlock mechanism for preventing asynchronous insertion cannot be incorporated).

[0013] The present invention has been made in view of the above points, and an object of the present invention is to automate the synchronization operation adjustment of a mobile power generation device and to perform a manual operation between a synchronization confirmation device on the temporary switch side and the mobile power generation device. To provide a non-interruptible switching system between different power supplies, which eliminates the need for communication relying on the power supply and provides an interlock mechanism for preventing the asynchronous closing of the temporary switch. It is in.

[0014]

According to the present invention, there is provided a classifying switch inserted in a predetermined section of a distribution line connecting a service power source as a main power source and a load, and a power source different from the service power source. A power supply auxiliary power supply connected at the time of power supply switching and a temporary switch connected in parallel to the segmented switcher at the time of power supply switching to the distribution line on the load side of the switch, and a normal power supply and power supply In a different power supply uninterruptible power switching system for performing power switching between auxiliary power supplies with uninterruptible power by synchronizing the two power supplies, (1) the temporary switch is incorporated in both ends of the switch. Instrument transformer, synchronization verification means for performing a synchronization verification of a normal power supply and an auxiliary power supply for power supply based on a voltage signal introduced through the instrument transformer, and the instrument transformer as a control power supply, An output signal of the synchronization verification means, A synchronization enabling determination circuit for determining whether a condition for enabling synchronization of the temporary switch is satisfied based on a potential difference, a frequency difference, and a phase difference between the power supply for use and the auxiliary power supply; As a control power supply,
When the condition for enabling synchronization is not satisfied, a synchronization control signal is generated for the auxiliary power supply with respect to a normal power supply, and the synchronization control signal is transmitted to the auxiliary power supply by a predetermined signal transmission unit. Equipment and
A synchronization signal receiving device for receiving a synchronization signal transmitted from the synchronization signal transmitting device to the power supply auxiliary power source, and automatically performing a synchronization operation control based on the received synchronization signal. A synchronization control device, wherein when the synchronization enabling condition of the synchronization enabling determination circuit is satisfied, the temporary switch is closed by a predetermined closing unit. (2) The predetermined closing unit includes: The temporary switch is provided with a mechanism that uses the instrument transformer as a control power source and releases the prohibition of closing of the temporary switch when the condition for enabling synchronization is satisfied by the synchronization enable determination circuit. (3) when the predetermined switching means is energized when the condition for enabling synchronization is satisfied by the circuit for determining whether or not synchronization is possible, using the transformer for an instrument as a control power source for the temporary switch. With Characterized by comprising providing a switch-on coil for automatically introducing temporary switching device, (4)
The temporary switch is integrally formed with the instrument transformer to form a temporary switch, and the synchronous verification means, the synchronization enabling determination circuit, and the synchronization signal transmitting device are integrally formed to detect synchronization. Constituting a unit, wherein the temporary opening and closing unit and the synchronization detection unit are electrically connected via a cable, wherein an electric signal detected by the instrument transformer is used as a power supply of the synchronization detection unit, (5) The instrument transformer is provided separately from the temporary switch, the synchronization verifying means, the synchronization enabling determination circuit, and the synchronization signal transmitting device, and its primary winding is connected live to the distribution line. And the secondary winding is connected to the synchronization verifying means, the synchronization enabling determination circuit and the synchronization signal transmitting device via a connection cable, and (6)
The synchronization verification means, the synchronization enable / disable determination circuit, and the synchronization signal transmitting device are integrally formed to constitute a synchronization detection unit, and the instrument transformer is provided separately from the temporary switch and the synchronization detection unit. The temporary switch and the synchronization detection unit are electrically connected via a connection cable, and an electric signal detected by the instrument transformer is used as a power supply of the synchronization detection unit.

[0015]

FIG. 1 is a functional block diagram showing an embodiment of the present invention. 1, the same parts as those in FIG. 10 are denoted by the same reference numerals. The difference between FIG. 1 and FIG. 10 is that instead of the conventional temporary switch 5, the bushings 8a and 8b with the detection terminals, and the synchronization confirmation device 9, the connection cable attaching / detaching bushings 30a and 30b and the temporary connection for different power supply synchronization are provided. A switch 31 is provided, and a synchronizing signal receiving device 32 is provided in the conventional power generating device 13 to constitute a moving power generating device 33 with a parallel operation function. The other portions are configured the same as in FIG. I have.

The temporary switch 31 for synchronizing different power sources is provided with a temporary switch 34 having instrument transformers PT1 and PT2 at both ends thereof, and a synchronization test based on voltage signals of the transformers PT1 and PT2. A synchronization verification means 11 (SY) and a synchronization confirmation switch 12 for performing the above-mentioned, a synchronization input possibility determination circuit 35 for determining whether a condition for enabling the synchronization of the temporary switch 34 is satisfied, and the establishment of the synchronization enabling condition A synchronous input enable signal relay ILC which is activated at the time, a synchronization control signal which is generated when the synchronous input enable condition is not satisfied, and is transmitted to the power generating device 33 as an automatic synchronization command; Synchronization enable signal relay ILC
When the normally open contact is closed at the time of energization, the switch closing prohibition canceling coil LC which is excited by the instrument transformer PT1 as a power supply, and the synchronization for independent power transmission connected in parallel to the normally open contact of the relay ILC. And a condition release switch 37.

(1) The temporary switch 34 has a built-in instrument transformer PT1 and PT2 on both the power supply side and the load side main circuit, and has the following function as a temporary switch for synchronizing different power sources. Things.

(2) The temporary switch 31 for turning on the different power supply synchronously has the following functions in principle, but as will be described later, if necessary, the visual verification synchronization verification means 11 and the synchronization confirmation switch 12 are used. Is a remote monitoring and operation type using an auxiliary signal cable to the position under the distribution pole for easy operation by the operator.

(3) Temporary switch 31 for synchronously turning on different power supplies
(A) The temporary switch 34 is provided with a closing prohibition canceling coil LC, and in principle, the canceling coil LC is excited only when the condition for enabling synchronization is satisfied by the synchronization enabling determination circuit 35 in principle.
The closing operation preventing mechanism of the built-in switch 34 is released, and the closing operation by the drawstring or the like is actually accepted only during the period of the synchronous closing enabled condition. Conversely, if the above-mentioned condition for enabling electrical connection is not satisfied, even if the operator performs an insertion operation with a drawstring or the like, it cannot be mechanically inserted. In addition, in a case where the power is supplied from the power supply side in the non-voltage state on the load side (single power transmission) or the like, a separate synchronization condition release switch 37 is provided.

(B) As a synchronization input confirming function, when the synchronization confirmation switch 12 is turned on, in addition to the synchronization verifying means 11 for visual confirmation, a synchronization activation possible judgment circuit 35 (voltage between the power supply side and the load side applied power supply) The synchronization enable signal of the above item (a) is created by detecting the difference, the frequency difference, and the phase difference, and the synchronization enable condition is created, and the load-side power supply (the power generator And a synchronizing signal transmitting device 36 for generating a synchronizing signal (a signal for raising / lowering the power generating device voltage and a signal for raising / lowering the frequency) with respect to the power generating device 33 and transmitting the same to the power generating device 33. . During the period in which the condition for enabling synchronous input is satisfied, the display unit also has a function of notifying the operator by performing an external display.

(C) In FIG. 1, the synchronization signal transmitting device 36 is of a wireless type in order to establish a wireless connection between the temporary switch 31 for synchronizing different power sources and the power generating device 33 for movement.
The mobile power generation device 33 is provided with a synchronization signal reception device 32 (however, a transmission / reception device is appropriately provided in consideration of economy, etc., so that a signal transmission means is a wire signal cable or an optical fiber. It is also possible to use a cable system or a system in which control is performed by distribution line conveyance using a coupling device (CC)).

(D) Further, as a feature of the temporary switch 31, the control power supply for operating the built-in devices described in (a) to (c) is a built-in instrument transformer P described at the beginning.
It is noteworthy that control power need not be supplied externally because power can be taken from T.

(E) Instrument transformers PT1, PT2
, The detection voltage accuracy is much better than the detection from the power detection terminals (8a, 8b in FIG. 3) of the conventional bushing part. In making the synchronizing signal, the voltage difference, the frequency difference, and the phase difference between the two power sources can be made with high accuracy.

Also, a bushing 30 for attaching and detaching a connection cable is provided.
The components a and 30b do not need to be provided with a power detection terminal.

(F) The temporary switch 31 for turning on the different power supply synchronously
In the same way as the temporary switch of the prior art, the place to be inserted into the distribution line is not only the on-pole section switch on the track, but also the edge turning wire, etc., as long as the track can be temporarily opened. good.

(4) Mobile power generation device 33 with parallel operation function
Is provided with a synchronizing signal receiving device 32 corresponding to the above, and when switching back from the power generating device 33 to the distribution line side after the power supply on the distribution line side is restored, the synchronization built in the temporary switch 31 for different power supply synchronization is provided. By the signal from the conversion signal transmission device 36,
Synchronization control can be performed by automatic operation. Therefore, during this time, the operator monitors only the temporary switch 31 for turning on the different power supply, and
It is sufficient to perform the operation, and it is not necessary to arrange the operators on both sides and exchange each time using a transceiver or the like as in the prior art example.

The procedure for mounting the entire system is the same as that of the prior art, but when switching back to the distribution line, the synchronization confirmation switch 1 is provided on the temporary switch 31 for turning on the different power supply as described above.
2, the power generator 33 automatically enters the synchronization operation, and the operator monitors the temporary switch-side synchronization verification means 11 with a sufficient margin, confirms that the synchronization-enabled indication is lit, and operates the switch-on operation ( Usually, a string operation may be performed. If the synchronization conditions are not met, the lock operation will be locked, so you can operate with confidence.

That is, when the synchronizing enable signal judging circuit 35 determines that the synchronizing enable condition is not satisfied, the synchronizing enable signal relay ILC is not energized and its normally open contact remains off. The switch closing prohibition canceling coil LC is not excited. For this reason, the interlock of the temporary switch 34 is not released, and the switch 34 is not asynchronously turned on even if an attempt is made to close the switch 34 by pulling string operation.

(5) FIG. 2 is a block diagram for explaining an embodiment in which the on / off operation of the temporary switch 34 is electrically operated. In this embodiment, when the synchronization confirmation switch 12 is turned on instead of using a pull string operation type as in the prior art for turning the switch on and off, the temporary switch 34 is automatically turned on in synchronization with the transmission of the synchronization enable signal. It is configured as follows. Compared with the system shown in FIG. 1, the temporary switch for synchronizing different power supplies is slightly more expensive, but the operation of the switch can be fully automated, for example, all switch operations can be completed.

FIG. 2 differs from FIG. 1 in that a normally closed contact of a switch 38 and a synchronous switch are provided on the secondary side of the instrument transformer PT1 in place of the synchronous condition releasing switch 37 and the switch closing inhibition releasing coil LC. Input signal relay I
Switch closing coil C connected via normally open contact of LC
C and a switch trip coil TC connected to the secondary side of the instrument transformer PT1 via a normally open contact interlocked with the normally closed contact of the switch 38 to provide a temporary switch for synchronously turning on different power supplies. The other parts are the same as those in FIG.

In the system configured as described above,
When it is determined in the synchronization enabling determination circuit 35 that the synchronization enabling condition is satisfied, the synchronization enabling signal relay IL
C is energized and its normally open contact closes. For this reason, the switch closing coil CC is excited by the power supply of the instrument transformer PT1, and the temporary switch 34 is automatically turned on. To trip the temporary switch 34, the switch 38 is used.
When the normally open contact is turned on, the closing coil CC is de-energized, and the switch trip coil TC is excited by the power supply of the instrument transformer PT1, so that the temporary switch 34 trips.

(6) Next, the synchronization verifying means 11 for visual confirmation and the synchronization confirmation switch 12 are remote-monitored and operated by using an auxiliary signal cable to a position under the power pole so that the operator can easily operate it. An embodiment will be described.

FIG. 3 differs from FIG. 1 in that the temporary switch 31 is divided into a temporary switch 310 and a synchronization detector 311 and both are connected by connection cables 6d, 6e, 6f. Are configured the same as in FIG. In addition, 30c-30h is a bushing. The temporary opening / closing section 310 integrally integrates the instrumentation transformers PT1 and PT2, the switch closing inhibition release coil LC, and the temporary opening / closing switch. The synchronization detecting unit 311 includes a visual verification synchronization verification unit 11, a synchronization confirmation switch 12, a synchronization enabling determination circuit 35, a synchronization signal transmitting device 36, a synchronization condition releasing switch 37, and a synchronization enabling signal relay ILC.
And is installed on the line of sight of the operator below the distribution pole.

As described above, since the instruments of the synchronization detection unit 311 can be installed near the operator on the ground, the operation is greatly simplified.

FIG. 4 is a block diagram of a system in which the present invention is applied to FIG. 4 is different from FIG. 2 in that the temporary switch 41 is divided into a temporary switch 410 and a synchronization detector 411, and both of them are connected with connection cables 6d, 6e,
6f and 6g, and other parts are shown in FIG.
It is configured identically. Note that 30c to 30j are bushings. The temporary opening / closing section 410 includes an instrument transformer PT.
1, PT2, switch closing coil CC, switch trip coil TC, and temporary switch 34 are integrally formed. The synchronization detection unit 411 includes a synchronization verification unit 11 for visual confirmation, a synchronization confirmation switch 12, and a synchronization enabling determination circuit 3.
5. The synchronizing signal transmitting device 36, the switch 38, and the synchronizing enable signal relay ILC are integrally formed, and are installed on the line of sight of the operator below the distribution pole.

As described above, since the instruments of the synchronization detecting section 411 can be installed near the operator on the ground, the operation is greatly simplified.

(7) As for the instrument transformers PT1 and PT2 built in both ends of the temporary switch 34, respectively, from the viewpoint that it is more economical to use a combination of general-purpose products, a temporary switch outer type is used. It is good. In this case, as shown in FIG. 5, the transformer unit for temporary installation of the distribution line is temporarily attached to the power supply side and the load side with the temporary switch 34 interposed therebetween.
The secondary side output may be configured to be supplied as a power source for the temporary switch 31 in a wire system.

Referring to FIG. 5, instrument transformers PT1, PT2
Are provided separately from the temporary switches 31 for synchronizing different power sources. 6d to 6g are connection cables, 7d and 7e are live connection parts, and 30c to 30h are bushings.

As described above, since the instrumentation transformers PT1 and PT2 can be separately provided, a system can be configured by combining general-purpose products, and the economy is very superior.

FIG. 6 is a block diagram in which the present invention is applied to the apparatus of FIG. 2, and the same parts as those of FIG. 2 are denoted by the same reference numerals. In FIG. 6, each of the instrument transformers PT1 and PT2 is provided separately from the temporary switch 41 for synchronizing different power sources. 6d to 6g are connection cables, 7d and 7e are live connection parts, and 30c to 30h are bushings. As described above, since the instrumentation transformers PT1 and PT2 can be separately provided, a system can be configured by combining general-purpose products as in the above-described case, and the economic efficiency becomes very superior.

FIG. 7 shows an embodiment in which instrumentation transformers PT1 and PT2 are separately provided in a system in which a temporary switch 31 for synchronizing different power sources is divided into a temporary switch 310 and a synchronization detector 311. ing. FIG. 8 shows an embodiment in which the instrumentation transformers PT1 and PT2 are separately provided in a system in which the temporary switch 41 for synchronizing different power sources is divided into a temporary switch 410 and a synchronization detector 411.

[0042] In FIGS. 7 and 8, 6D～6i connection cable, 7d, 7e the hot connecting portion, 30C～30 _L is bushing. Thus, the instrumentation transformers PT1, PT
2 can be provided separately, so that a system can be configured by combining general-purpose products in the same manner as described above, and the economic efficiency becomes very superior.

[0043]

FIG. 9 shows a specific example of an uninterruptible power switching system between different power sources, where (a) is a conventional system and (b)
Is according to the invention. The temporary switch shown in FIG. 9A shows the temporary switch 5 and the synchronization confirmation device 9 shown in FIG. 10, and the power supply vehicle shows the mobile power generator with the parallel operation function shown in FIG. According to FIG. 9A, it is necessary to perform power transmission immediately near the temporary switch.

9B shows the temporary switching units 310 and 410 shown in FIGS. 3 and 4, and the power recovery operation unit includes the synchronization detecting units 311 and 411 shown in FIGS. The power supply vehicle is a mobile power generator 3 with a parallel operation function according to the present invention.
3 is shown. According to FIG. 9B, power can be easily transmitted even from a place distant from the temporary opening / closing unit. Further, since the multiple electric operation unit (synchronization detection units 311 and 411) can be installed on the line of sight of the operator below the distribution pole, the operation is greatly simplified.

Although FIG. 1 to FIG. 9 show the case where the present invention is applied to a high-voltage distribution system, the present invention is not limited to this, and the same applies to low-voltage distribution systems if the equipment used is replaced with a low-voltage distribution system. An effect can be obtained.

[0046]

As described above, according to the present invention, an instrument transformer built in both ends of the temporary switch and a voltage signal introduced through the instrument transformer are used. Synchronization verification means for verifying the synchronization between a power supply and an auxiliary power supply for power supply, the instrument transformer as a control power supply, an output signal of the synchronization verification means, a potential difference, a frequency difference, a potential difference between a normal power supply and the auxiliary power supply. Based on the phase difference, a synchronization enabling determination circuit that determines whether or not the synchronization enabling condition of the temporary switch has been satisfied, and the instrument transformer as a control power source, and when the synchronization enabling condition is satisfied, A synchronization signal transmitting device for generating a synchronization signal for the auxiliary power supply with reference to a normal power supply and transmitting the synchronization signal to the auxiliary power supply by a predetermined signal transmission means; Opening and closing The power supply auxiliary power supply (moving power generation device) includes a synchronization signal receiving device that receives a synchronization signal transmitted from the synchronization signal transmission device, and a synchronization signal reception device that receives the synchronization signal based on the received synchronization signal. And a synchronous control device for automatically performing a synchronous operation control is provided. When the condition for enabling synchronization is satisfied by the synchronization enabling determination circuit, the temporary switch is closed by a predetermined closing means. The following excellent effects can be obtained.

(1) When switching back the power from the power generator to the distribution line, conventionally, the operator exchanges both the temporary switch and the power generator with a transceiver or the like, and manually synchronizes the power generator based on the exchange. Although operation adjustment was required, in the present invention, it is sufficient to issue an automatic synchronization command from the temporary switch (the power generator side is in automatic synchronization operation). Further, the confirmation of the synchronization is reliably performed in the temporary switch body.

(2) If the signal transmission means is of a wireless type, even if the temporary switch mounting point is separated from the mobile power generation device (usually, the separation distance between the two devices should be about 100 m or less. The power generator can be operated in an automatically synchronized manner. For this reason, the mobile power generation apparatus has conventionally been often parked on the road, but according to the present invention, it is easy to use the mobile power generation apparatus after being evacuated to an empty space or the like.

(3) The power generation device synchronization control at the time of switching back the power from the power generation device side to the distribution line side is performed by returning the power distribution line despite the fact that the power generation device side main circuit cable is only three. Since the comparison between the power supply and the detection voltage can be performed with high accuracy, reliable synchronization control can be performed.

(4) The greatest feature of the present invention is that the temporary switch has a function of avoiding the asynchronous closing, thereby preventing the power generator and the like from being damaged by the asynchronous closing.

(5) Others The system of the present invention can also be used for confirming phase detection when an existing high-voltage distribution line is replaced.

(6) Since the instrument transformer incorporated in the temporary switch is used not only for detecting a different power supply voltage, but also for powering various devices in the temporary switch for turning on different power supplies, There is no need to provide a separate control power supply from outside, which is very economical.

(7) Since the temporary switch has a built-in instrument transformer, the detection voltage accuracy is much better than the detection from the power detection terminal of the conventional bushing unit, and the condition for enabling the synchronization is as follows. When synchronizing signals, a voltage difference, a frequency difference, and a phase difference between both power sources can be accurately created.

(8) Further, the temporary switch for synchronizing different power sources is separated into a temporary switching section and a synchronization detecting section, and the two sections are connected by a cable, so that the synchronous detecting section is positioned on the line of sight of the operator below the distribution pole. Operation can be greatly simplified.

(9) When the instrument transformer is provided separately, a general-purpose product can be combined to constitute a system, and the economic efficiency becomes very superior.

[Brief description of the drawings]

FIG. 1 is a block diagram of an uninterruptible power switching system between different power supplies according to an embodiment of the present invention.

FIG. 2 is a block diagram of an uninterruptible power switching system between different power sources according to another embodiment of the present invention.

FIG. 3 is a block diagram of an uninterruptible power switching system between different power supplies according to another embodiment of the present invention.

FIG. 4 is a block diagram of an uninterruptible power switching system between different power sources according to another embodiment of the present invention.

FIG. 5 is a block diagram of an uninterruptible power switching system between different power supplies according to another embodiment of the present invention.

FIG. 6 is a block diagram of an uninterruptible power switching system between different power supplies according to another embodiment of the present invention.

FIG. 7 is a block diagram of an uninterruptible power switching system between different power supplies according to another embodiment of the present invention.

FIG. 8 is a block diagram of an uninterruptible power switching system between different power supplies according to another embodiment of the present invention.

FIG. 9 schematically shows an uninterruptible power switching system between different power sources,
(A) is a block diagram of a conventional device, (b) is a block diagram of the present invention.

FIG. 10 is a block diagram of a conventional uninterruptible power switching system between different power supplies.

[Explanation of symbols]

1 ... distribution substation 2 ... distribution line 3a, 3b ... pole section switch 4 ... uninterruptible relief load group 6a-6i ... connecting cable 11 ... synchronization test unit 12 ... synchronization confirmation switch 30A～30 _L ... bushing 31, 41: Temporary switch for synchronizing different power supplies 32: Synchronization signal receiving device 33: Mobile power generator with parallel operation function 34: Temporary switch 35: Synchronization enable determination circuit 36: Synchronization signal transmitting device 37: Synchronization Condition release switch 38 Switch 310, 410 Temporary opening / closing unit 311 411 Synchronization detection unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isamu Sudo 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Inside Meidensha Co., Ltd.

Claims (6)

[Claims] 1. A division switch inserted in a predetermined section of a distribution line connecting a service power supply serving as a main power supply to a load, and a power supply different from the service power supply, and a distribution line on a load side of the division switch. A power supply auxiliary power supply connected at the time of power supply switching, and at the time of power supply switching, a temporary switch connected in parallel to the segmented switch, and power supply switching between the normal power supply and the power supply auxiliary power supply, In the uninterruptible power switching system between different power supplies that performs the uninterruptible power supply by synchronizing the two power supplies, the temporary switch, an instrument transformer incorporated at both ends of the switch, and the instrument transformer Synchronization verification means for performing synchronization verification of a common power supply and an auxiliary power supply for power supply based on a voltage signal introduced through the control unit, an output signal of the synchronization verification means, And between the auxiliary power supply Based on the phase difference, the frequency difference, and the phase difference, a synchronization enabling determination circuit that determines whether or not a synchronization enabling condition of the temporary switch has been satisfied, and the instrument transformer as a control power supply, A synchronization signal transmitting device for generating a synchronization control signal for the auxiliary power supply based on a normal power supply when the synchronization enabling condition is not satisfied, and transmitting the synchronization control signal to the auxiliary power supply by predetermined signal transmission means; And a synchronization signal receiving device that receives a synchronization signal transmitted from the synchronization signal transmitting device to the power supply auxiliary power supply, and automatically synchronizes based on the received synchronization signal. A synchronous control device for performing operation control, wherein when the condition for enabling synchronization is satisfied by the synchronization enabling determination circuit, the temporary switch is closed by a predetermined closing means. Electrical switching system. 2. The method according to claim 1, wherein the predetermined switching means uses an instrument transformer as a control power source for the temporary switch, and cancels the switching prohibition of the temporary switch when the synchronization enabling condition of the synchronization enabling determination circuit is satisfied. The uninterruptible power switching system between different power sources according to claim 1, wherein a mechanism for performing a non-synchronous switching of the temporary switch is provided by providing a mechanism for performing the switching. 3. The temporary switching device, wherein the temporary switch is energized when a synchronous switching enabling condition of the synchronous switching determination circuit is satisfied by using a meter transformer as a control power source. The uninterruptible switching system between different power supplies according to claim 1, further comprising a switch closing coil for automatically turning on the switch. 4. The temporary switch is formed integrally with an instrument transformer to constitute a temporary switch, and the synchronization verification means, the synchronization enable determination circuit, and the synchronization signal transmitting device are integrally formed. Forming and configuring a synchronization detection unit, the temporary switching unit and the synchronization detection unit are electrically connected via a cable, and an electric signal detected by the instrument transformer is used as a power supply of the synchronization detection unit. The uninterruptible power switching system between different power sources according to claim 1, 2 or 3. 5. The instrument transformer is provided separately from the temporary switch, the synchronization verification means, the synchronization enable / disable determination circuit, and the synchronization signal transmitting device, and its primary winding is hot-wired to the distribution line. 3. The connection according to claim 1, wherein the secondary winding is connected to a synchronization verification means, a synchronization enabling determination circuit and a synchronization signal transmitting device via a connection cable.
Or the uninterruptible power switching system between different power supplies according to 3. 6. A synchronization detecting section by integrally forming the synchronization verifying means, a synchronization enabling determination circuit, and a synchronization signal transmitting device, wherein the instrument transformer is connected to the temporary switch, a synchronization detecting section. Separately provided, the temporary switch and the synchronization detection unit are electrically connected via a connection cable, and an electric signal detected by the instrument transformer is used as a power supply of the synchronization detection unit. The uninterruptible power switching system between different power sources according to claim 1, 2, or 3.