JPH11122844A - Uninterruptible switching system among different power supplies - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate communication through manual interventions between a temporary switch and a movable power generator and prevent the damage to the power generator and the other devices by providing a temporary switch with an interlocking mechanism for avoiding asynchronous powering on, and when the supply of power is switched between a transforming station for power distribution and the movable power generator with a parallel operating function without the interrupt of power by synchronizing the two power supplies led out from both terminals of the temporary switch. SOLUTION: A temporary switch 31 has built-in voltage detectors 50a, 50b. A synchronization test is conducted using the voltages detected by the voltage detectors 50A, 50b and a synchronization discriminating circuit 35 discriminated whether or not synchronizing conditions of the temporary switch 31 are satisfied. If the conditions are not satisfied, a synchronizing signal is transmitted by ratio from a synchronizing signal transmitter 36 to a synchronizing signal receiver 32 of a power generator 33. After that, a synchronizing controller 19 automatically controls the synchronizing operation and energizes a relay ILC to energize a switch turn-on prohibition calceling coil LC, and then turn on the switch 31.

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 A conventional uninterruptible power switching system between different power sources is, for example, a system disclosed in Japanese Utility Model Publication No. 5-8766 shown in FIG. In this system, it was necessary to install an auxiliary power supply (power supply vehicle) for power supply in the immediate vicinity of the temporary switch and to connect a large number of as many as six cables from the power supply vehicle.

In order to solve this problem, a conventional uninterruptible switching system between different power sources as shown in FIG. 4 has been proposed. In FIG. 4, reference numeral 1 denotes a distribution substation, 2 denotes a commercial high-voltage distribution line, 3a and 3b denote pole-side switches arranged in the distribution line 2, and 4 denotes 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 installed on a distribution pole provided with a section switch 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.

[0005] Therefore, at the start of the work, first, the above-mentioned devices are attached, 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.

In FIG. 4, reference numeral 13 denotes a live 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.

Next, the mobile power generator 13 with the parallel operation function, which is hot-line connected to the load side of the pole section switch 3b, is started, and the power generation side is synchronized with the power distribution system by the synchronous control device 19 by the synchronous control device 19. 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.

After the work on the distribution line side is completed, the on-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.

[0009]

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.

[0010] Therefore, when the temporary installation location of the synchronization confirmation device 9 and the power transmission location (parking location) of the mobile power generation device 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 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, according to 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 biggest 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 the state where it can be electrically turned on synchronously. 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).

Further, in order to solve the above problem, an uninterruptible power switching system between different power sources shown in FIG. 5 has been proposed. 5, the same parts as those in FIG. 4 are indicated by the same reference numerals. 5 is different from FIG. 4 in that the temporary switch 5,
Instead of the bushings 8a and 8b with a voltage detection terminal and the synchronization confirmation device 9, bushings 30a and 30b for attaching and detaching connection cables.
In addition to providing a temporary switch 31 for synchronizing different power sources and providing a synchronizing signal receiving device 32 to the power generating device 13 to constitute a mobile power generating device 33 with a parallel operation function, the other portions are the same as those in FIG. It has the same configuration.

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, and a synchronization test based on the 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.

However, the system shown in FIG. 5 has the disadvantage that the temporary transformers are special, large in mass, and very poor in workability because the instrumentation transformers PT1 and PT2 are provided in the voltage detection means and the control power supply. Was. That is, since the temporary switch is installed on a telephone pole or the like, it has been desired to reduce the weight in handling.

The present invention has been made in view of the above points, and an object of the present invention is to automate synchronization operation adjustment of a mobile power generation device and to perform manual operation between a synchronization confirmation device on a temporary switch side and a mobile power generation device. In addition to eliminating the need for communication relying on a temporary switch, an interlock mechanism for preventing the asynchronous closing of the temporary switch is provided to prevent damage to the power generator, etc., and to reduce the size and weight of the temporary switch. It is to provide an uninterruptible switching system between different power sources.

[0018]

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. A voltage detector, and a synchronization verifying unit that performs a synchronization verification of the service power supply and the auxiliary power supply for power supply based on the voltage signal introduced through the voltage detector,
A storage battery is used as a control power supply, and based on an output signal of the synchronization verification means and a potential difference, a frequency difference, and a phase difference between a normal power supply and the auxiliary power supply, whether or not a condition for enabling the temporary switch to be synchronized is satisfied. A synchronization input possible determination circuit for determining whether the synchronization input possible condition is not satisfied, and a synchronization control signal for the auxiliary power supply based on a commercial power supply when the synchronization input possible condition is not satisfied; A synchronization signal transmitting device for transmitting to the auxiliary power supply, a synchronization signal receiving device for receiving the synchronization signal transmitted from the synchronization signal transmitting device to the power supply auxiliary power supply, A synchronization control device that automatically performs a synchronization operation control based on the synchronization signal that has been provided. (2) the predetermined closing means is configured to prohibit the temporary switch from being closed when the condition for enabling synchronization is satisfied by the synchronization enabling determination circuit. A mechanism for releasing the temporary switch is provided to prevent asynchronous closing of the temporary switch. (3) The predetermined closing means is provided to the temporary switch when the synchronous switch enable condition of the synchronous switch enable determination circuit is satisfied. Characterized in that it is provided with a switch closing coil that is excited and automatically closes a temporary switch.
The temporary switch is integrally formed with a voltage detector to form a temporary switch, and the synchronization verifying means, the synchronization enabling determination circuit, and the synchronization signal transmitting device are integrally formed to form a synchronization detector. Wherein the temporary opening / closing section and the synchronization detecting section are electrically connected via a cable, and the storage battery is used as a power supply.

[0019]

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 5 are denoted by the same reference numerals. The difference between FIG. 1 and FIG. 5 is that the temporary switch 31 for synchronizing different power supplies is replaced with voltage detectors 50a and 50 instead of PT1 and PT2 for the instrument transformer.
b, temporary switch 34 and closing prohibition release coil L
C, a synchronization opening / closing section 310, a synchronization verification section 11 (SY) for performing synchronization verification based on a control power supply 51 using a battery (storage battery) and voltage signals of the voltage detectors 50a and 50b for detecting synchronization. It is composed of a switch 12, a synchronization enabling determination circuit 35, a synchronization signal transmitting device 36, a synchronization enabling signal relay ILC, and a synchronization detecting unit 311 composed of a synchronization condition canceling switch 37. It is configured identically. still,
6d, 6e and 6f are connection cables, and 30c to 30h are connection cable attaching / detaching bushings.

(1) The temporary switch 34 has the following function as a temporary switch for synchronizing different power sources.

(2) The temporary switch 31 for synchronizing different power supplies has, in principle, the functions described below, but as will be described later, if necessary, the synchronization verification means 11 for visual confirmation, the synchronization confirmation switch 12, etc. 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 turning on different power supply synchronously
(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 input possibility determination 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 turning on the different power supply and the power generator 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) above uses a battery (51). The voltage accuracy is much better than the detection from the power detection terminals (8a and 8b in FIG. 4) of the bushing section of the prior art.
In generating the synchronization enabling condition and the synchronization signal described in the above item (b), the voltage difference, frequency difference, and phase difference between the two power sources can be made with high accuracy.

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

(E) 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 generator 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 device of the whole 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 synchronizing different power sources 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 synchronization enabling determination circuit 35 determines that the synchronization enabling condition is not satisfied, the synchronization enabling 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 illustrating 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 the control power supply 51 replaces the synchronization condition release switch 37 and the switch closing inhibition release coil LC with a normally closed contact of the switch 38 and a synchronization enable signal relay ILC. And a switch trip coil TC connected to the control power supply 51 via a normally open contact that interlocks with the normally closed contact of the switch 38. The temporary opening / closing unit 410 and the synchronization detecting unit 411 are configured, and both are connected by connection cables 6d, 6e, 6f, and 6g. The other parts are the same as those in FIG. Note that 30c to 30j are bushings.

The temporary opening / closing section 410 includes a voltage detector 50
a, 50b, a switch closing coil CC, a switch trip coil TC, and a 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.

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 control power supply 51, and the temporary switch 34 is automatically turned on. In addition, temporary switch 3
When the switch 4 is tripped, when the normally open contact of the switch 38 is turned on, the closing coil CC is de-energized, and the switch trip coil TC is excited by the control power supply 51, so that the temporary switch 34 trips. .

[0036]

FIG. 3 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 of FIG. 3A shows the temporary switch 5 and the synchronization confirmation device 9 of FIG.
The power supply vehicle shows the mobile power generator with the parallel operation function of FIG. According to FIG. 3A, it is necessary to perform power transmission in the immediate vicinity of the temporary switch.

3B shows the temporary switching units 310 and 410 shown in FIGS. 1 and 2, 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. 3B, power can be easily transmitted 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.

Further, since the voltage transformer and the control power supply are not used for the voltage detector and the control power supply, but the voltage detector based on the capacitor voltage division and the control power supply using the battery are used, the temporary switch can be reduced in weight.

Although FIGS. 1 and 2 show the case where the present invention is applied to a high-voltage distribution system, the present invention is not limited to this. An effect can be obtained.

[0040]

As described above, according to the present invention, a segmented switch inserted in a predetermined section of a distribution line connecting a main power supply as a main power supply and a load, and a power supply different from the main power supply,
To the distribution line on the load side of the segmented switch, an auxiliary power supply for power supply connected at the time of power supply switching, and at the time of power supply switching,
A temporary switch that is connected in parallel with the segmented switch, and a power switch between a normal power supply and an auxiliary power supply for power supply, and an uninterruptible switching system between different power supplies that synchronizes the two power supplies and performs uninterrupted power supply switching In the temporary switch, a voltage detector built in both ends of the switch, and synchronization of a normal power supply and an auxiliary power supply for power supply based on a voltage signal introduced via the voltage detector. Synchronization verification means for performing verification, a storage battery as a control power supply, and synchronization of the temporary switch based on an output signal of the synchronization verification means and a potential difference, a frequency difference, and a phase difference between a normal power supply and the auxiliary power supply. A synchronization enabling determination circuit for determining whether or not the enabling condition is satisfied; and, when the synchronization enabling condition is not satisfied, creating a synchronization control signal for the auxiliary power source with respect to a normal power source. A synchronizing signal transmitting device for transmitting a control signal to the auxiliary power supply by a predetermined signal transmitting means; and a synchronizing signal receiving the synchronization signal transmitted from the synchronizing signal transmitting device to the auxiliary power supply for power supply. A signal receiving device, and a synchronization control device for automatically performing a synchronization operation control based on the received synchronization signal. When the synchronization enabling condition of the synchronization enabling determination circuit is satisfied, predetermined synchronization means is provided. As a result, the following advantages can be obtained.

(1) When the power is switched back from the power generator to the distribution line, the operator conventionally 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) In the case where the signal transmission means is of a wireless type, even if the temporary switch mounting point and the mobile power generation device are far apart (usually, the separation distance between the two devices is about 100 m or less is sufficient. 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 to the distribution line is performed by returning the power distribution line despite the fact that the power generation device has only three main circuit cables. 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 damage to the power generator and the like due to the asynchronous closing.

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

(6) Further, since the instrument transformer is not used for the voltage detector and the control power supply, the voltage detector based on the capacitor voltage division and the control power supply using the battery are used.
The weight of the temporary switch can be reduced, and workability is significantly improved.

(7) Since the temporary switch has a built-in voltage detector, the accuracy of the detected voltage is much better than the detection from the power detection terminal of the conventional bushing unit. In making the synchronization signal, the voltage difference, frequency difference, and phase difference between the two power sources can be created with high accuracy.

(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. Operation can be greatly simplified.

(9) When the voltage detector is separately provided, the system can be configured by combining general-purpose products, and the economical advantage 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 supplies according to another embodiment of the present invention.

FIG. 3 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. 4 is a block diagram of a conventional uninterruptible power switching system between different power supplies.

FIG. 5 is a block diagram of a conventional uninterruptible power switching system between different power supplies.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Distribution substation 2 ... Distribution line 3a, 3b ... Pole section switch 4 ... Uninterruptible rescue load group 6a-6g ... Connection cable 11 ... Synchronization verification means 12 ... Synchronization confirmation switch 30a-30j ... Bushing 31, 41 ... Temporary switch for different power supply synchronous input 32 ... Synchronization signal receiving device 33 ... Transfer 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 50a, 50b Voltage detector 51 Control power supply 310, 410 Temporary opening / closing unit 311 411 Synchronization detection unit

Claims (4)

[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 inter-power-supply uninterruptible switching system that performs the uninterruptible power supply by synchronizing the two power supplies, the temporary switch, a voltage detector built in at both ends of the switch, and the voltage detector Synchronization verifying means for performing synchronization verification of a normal power supply and an auxiliary power supply for power supply based on the introduced voltage signal, and a storage battery as a control power supply; an output signal of the synchronization verification means; Potential difference, frequency Based on the phase difference, based on the phase difference, a synchronization enabling determination circuit that determines whether a condition for enabling synchronization of the temporary switch has been satisfied, and, when the condition for enabling synchronization is not satisfied, based on a normal power supply A synchronization signal transmitting device for generating a synchronization control signal for the auxiliary power supply and transmitting the synchronization control signal to the auxiliary power supply by a predetermined signal transmission unit; and providing the synchronization to the power supply auxiliary power supply. A synchronization signal receiving device that receives a synchronization signal transmitted from the signal transmission device; and a synchronization control device that automatically performs a synchronization operation control based on the received synchronization signal. An uninterruptible power switching system between different power sources, characterized in that the temporary switch is turned on by a predetermined input means when a condition for enabling synchronization of the determination circuit is satisfied. 2. The temporary closing device further includes a mechanism for releasing the prohibition of closing of the temporary switch when the condition for enabling synchronization is satisfied by the synchronization enabling determination circuit.
The uninterruptible power switching system between different power sources according to claim 1, wherein asynchronous switching of the temporary switch can be prevented. 3. The predetermined closing means includes a switch closing coil that is energized to the temporary switch when the condition for enabling synchronization is satisfied by the synchronization enable determination circuit and that automatically switches on the temporary switch. The uninterruptible switching system between different power supplies according to claim 1, wherein the system is provided. 4. The temporary switch is formed integrally with a voltage detector to form a temporary switch, and integrally forms the synchronization verification means, a synchronization enabling determination circuit, and a synchronization signal transmitting device. 4. A synchronous detecting section, wherein the temporary opening / closing section and the synchronous detecting section are electrically connected via a cable, and a storage battery is used as a power supply.
The uninterruptible power switching system between different power supplies according to the above.