JP2000261986A - Method of switching power with distribution system by generator vehicle, and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for switching power with distribution line by a generator vehicle where it will do to only connect a means capable of connection and breaking to only the load side of a live wire, for uninterruptive switching from power side to the generator vehicle side, at power failure construction of a distribution line. SOLUTION: For switching of a distribution line from the power side to generator vehicle side, only an active line connection clamp 8A and the clamp system of a current sensor 21 are connected to a distribution line 1, and a load current is checked with a current sensor 21 and a current detection means 22, and synchronization is detected with a synchronization detection means 19, and a breaker is turned on, and a load is shifted from the power side of the distribution line to the side of a generator 5, and a switch 2 on a pole is opened with the completion of load shift. This dispenses with the connection work of the active line connection clamp 11A shown by the section of a block A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterrupted switching of a generator vehicle from a live line open portion such as a pole switch of a distribution line to a downstream load during construction of a distribution line, and power supply from the generator vehicle to the load. The present invention relates to a method and an apparatus for switching a power supply to and from a power distribution system by a generator vehicle for performing power supply.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for uninterrupted power distribution line loads such as computers and hospitals, and there has been a strong demand for uninterrupted power distribution line construction. . Therefore, in general, during distribution line construction, power is continuously supplied to a downstream load by a generator vehicle to limit a power failure to only a construction section.

[0003] A method of switching between uninterruptible power supplies by a generator vehicle used for such distribution line construction will be described with reference to a single-line connection diagram shown in FIG. A generator vehicle 3 is arranged near a pole switch (open live part) 2 inserted in the middle of the distribution line 1.

[0004] The generator car 3 includes a prime mover 4 and a generator 5 driven by the prime mover. The output side of the generator 5 is connected to an output terminal 8 via a circuit breaker 6 and a disconnector 7 by a power cable, and further from the circuit breaker 6 to an input terminal 11 via a circuit breaker 9 and a disconnector 10 by a power cable. Connected.

[0005] The output end 8 is connected to a live connection clamp 8A by a power cable, and the live connection clamp 8A is live connected to the load-side distribution line 1 downstream of the pole switch 2. The input end 11 is connected to a live-line connection clamp 11A by a power cable, and the live-line connection clamp 11A is hot-lined to a power distribution line 1 on the power supply side upstream of the pole switch 2. The hot-line connection clamps 8A and 11A and the input terminal 11 and the output terminal 8 together with the disconnecting switches 7 and 10 constitute connecting / disconnecting means, and enable connection and disconnection between the generator car and the distribution line.

The generator car 3 is provided with instruments such as a transformer (PT) and a current transformer (CT). The transformer 12 detects a voltage signal on the disconnector 10 side, and the transformer 13 detects a voltage signal on the disconnector 7 side. The transformer 14 detects the output voltage signal of the generator 5, and the current transformer 15 detects the output current of the generator 5 via the circuit breaker 6. The current transformer 16 detects a current flowing through the circuit breaker 9.

In the above configuration, a procedure for switching the downstream side of the switch 2 without interruption during distribution line construction will be described below.

(1) The worker uses the live-line connection clamps 8A and 11A connected to the generator car to perform connection operation between each phase of the output end 8 and the input end 11 and each phase of the distribution line 1, respectively. Then, the disconnectors 7 and 10 are closed.

(2) The transformer 12 is operated by the connection operation described above.
And 13, the voltage signals at both ends of the switch 2 are taken in, and the operator confirms from these voltage signals that there is no error in the phase sequence in the connection operation. This check may be performed by the operator while visually checking the meter, or may be performed automatically by the phase detection check unit 17.

(3) After confirming the above-mentioned phase detection, the circuit breaker 9 is turned on, and a parallel circuit of distribution lines sandwiching the pole switch is formed in the generator car.

(4) After the formation of the parallel circuit, the pole switch 2 is opened. At this time, the load current is
From the power supply side through the interior of the generator car 3 to the load side of the pole switch 2.

(5) In the above-mentioned bypass state of the load current, the load amount supplied to the load side is measured from the voltage of the transformer 12 and the load current of the current transformer 16, and the current load amount is determined by this measurement. Is below the rated output of the generator 5 by the load amount measuring means 18.

(6) After checking the load amount, the voltage signal of the generator 5 in operation and the voltage signal of the distribution line 1 are compared to detect synchronization. This synchronization detection is performed by the synchronization detection means 19 from the voltage signal of the transformer 12 and the voltage detection signal of the transformer 14, and the circuit breaker 6 is turned on by the synchronization detection.

(7) After the above synchronization, the output of the prime mover 4 is gradually increased to increase the power generated by the generator 5, and the current supplied to the load is gradually increased from the power supply side of the distribution line to the generator side. Move to This load shift is performed while the operator visually compares and confirms the value of the load amount measuring unit 18 with the value of the generated power measuring unit 20.
The output of the prime mover 4 may be automatically controlled so that the value of 8 approaches 0.

(8) After the completion of the above load transfer, the circuit breaker 9
Then, the disconnector 10 is opened to continue the power supply from the generator 5 to the load.

The uninterruptible power switchover procedure described above is for the construction of the distribution line 1. When the power is restored to the pole switch 2 without uninterrupted power after the construction is completed, the above procedure is substantially reversed. The phase check is performed after the live connection clamp 11A is reconnected, the synchronization is detected, the pole switch 2 is turned on, and the generator 5 is turned on.
The transition is made to the power supply side by lowering the output.

[0017]

According to the conventional method of switching power from a power distribution system to a power distribution system by a generator vehicle, when switching from the power supply side of the distribution line to the generator vehicle, the generator vehicle switches a pole switch (open live line portion). Connect to both the power and load sides.
It is necessary to connect using disconnectable means. In addition, the connection / disconnection means on the power supply side should be disconnected once from the distribution line for construction such as re-distribution of the distribution line, and connected to the distribution line again when switching from the generator car to the power supply side after the construction is completed. Labor is required.

The connecting / disconnecting means is a heavy load composed of a power cable having a current capacity equivalent to that of a distribution line, a hot-line connection clamp, and an input / output end, and is a live-line connection clamp to which the power cable is connected. This requires the connection to be lifted to the position of the switch on the pole and the disconnection work at the end of the construction, which has been a large-scale work.

Next, depending on the convenience of the distribution line construction, switching is performed without interruption only when switching from the power supply side of the distribution line to the generator vehicle, and adjustment of the power recovery time is performed when the power supply is switched from the generator vehicle to the power supply side of the distribution line. In some cases, switching to a power outage may be sufficient. Even in this case, the conventional switching method requires a pair of connectable / disconnectable means to be hot-lined to the distribution line, and has the same problem.

An object of the present invention is to connect a disconnectable / disconnectable means only to the load side of an open portion of a live line for the uninterruptible switching from the power supply side to the generator car side during the above-mentioned distribution line power outage work. It is an object of the present invention to provide a method and an apparatus for switching power supply to and from a power distribution system by a generator car that requires only power.

[0021]

SUMMARY OF THE INVENTION The present invention provides a method and a device for switching from a power source side of a distribution line to a generator vehicle side, and a clamp temporarily provided on a load side of an open portion of a live line and upstream of a connection / disconnection means. Checking the amount of load using a current sensor, and transferring the load from the generator car to the load via the connectable / disconnectable means while supplying power to the load from the power supply side of the distribution line through the open live line By doing so, when switching to the generator vehicle side, the connection and disconnection work by means of connectable / disconnectable between the power supply side of the live line open part and the generator vehicle is unnecessary, the following method and its device Features.

(First Invention) A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker, and a synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator. A generator car having a distribution line current supplied to a load from the distribution line and a current detection means for detecting an output current of the generator, respectively, is used to open the distribution line when performing uninterruptible work on the distribution line. In the vicinity of the portion, in the power supply switching method with the power distribution system by the generator vehicle to temporarily switch to the power supply from the generator to the load without uninterrupted power instead of the power supply to the load from the power supply side of the distribution line A temporary clamp-type current sensor is provided on the distribution line near the live-line open portion, and the distribution line current detected by the current sensor is taken into distribution line current detection means of the generator vehicle, Confirm that the distribution line current detected by the detection means of the line current is equal to or less than the rated current of the generator, and the distribution line and the generator at a position downstream of the current sensor on the load side of the open live line portion. Connected to the output end of the generator by the connectable / disconnectable means, and in the operating state of the generator, the circuit breaker is turned on by the synchronization signal detected by the synchronization detection means of the generator vehicle, and the distribution line current detection means and The load amount is shifted from the power supply side of the distribution line to the generator side based on the detection value of the generator current detection means, and the hot-line open portion is opened after the load shift is completed. How to switch the power supply to the distribution system by the generator car.

(Second invention) A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker, and a synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator. A generator car having a distribution line current supplied to a load from the distribution line and a current detection means for detecting an output current of the generator, respectively, is used to open the distribution line when performing uninterruptible work on the distribution line. Placed in the vicinity of the portion, temporarily switch to power supply from the generator to the load without interruption, instead of power supply from the power supply side of the distribution line to the load, and then from the generator to the distribution line A power supply switching method for a power distribution system by a generator vehicle that switches to a power supply side and supplies power to a load, wherein a temporary clamp-type current sensor is provided on the distribution line near the live-line open portion,
The distribution line current detected by the current sensor is taken into the distribution line current detection means of the generator car, and the distribution line current detected by the distribution line current detection means is confirmed to be equal to or less than the rated current of the generator. Connecting the distribution line and the output end of the generator by a first connectable / disconnectable means at a position downstream of the current sensor on the load side of the live line open portion, and operating the generator in an operating state. The circuit breaker is turned on by the synchronization signal detected by the synchronization detection means of the generator car, and the amount of load supplied to the load is determined based on the detection values of the distribution line current detection means and the generator current detection means. The load is shifted from the power supply side of the distribution line to the generator side, and after the load transfer is completed, the hot-line open portion is opened, and while the generator supplies power to the load, the power supply side of the distribution line and the Generator output Are connected to each other by a second connectable / disconnectable means via a second circuit breaker, and after the power supply is restored, the power supply side distribution line connected to the second connectable / disconnectable means and the power generation When the synchronization is detected by the synchronization detecting means on the machine side, the second circuit breaker is turned on to shift the load from the generator side to the power supply side of the distribution line, and after the load shift is completed, the live line is released. A method for switching a power supply to a power distribution system by a generator vehicle, comprising: inserting a part and disconnecting the first and second connectable / disconnectable means from the distribution line.

(Third invention) A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker, and a synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator. Having a distribution line current supplied to the load from the distribution line and current detection means for detecting the output current of the generator, respectively, when performing uninterruptible work on the distribution line, A generator car arranged in the vicinity, a clamp-type current sensor temporarily installed near the hot-line open portion and detecting a distribution line current supplied to the load from the distribution line, and a distribution line current detected by the current sensor. Means for detecting the distribution line current to be taken, means for confirming that the distribution line current detected by the distribution line current detection means is equal to or less than the rated current of the generator, and Electric First connecting / disconnecting means for connecting the distribution line and the output end of the generator at a position downstream of a sensor, and a synchronization signal detected by the synchronization detection means of the generator vehicle in an operating state of the generator Means for turning on the circuit breaker, and the amount of load supplied to the load based on the detection values of the distribution line current detection means and the generator current detection means from the power supply side of the distribution line to the generator side Means for shifting the load to, a second connectable / disconnectable means capable of connecting the power supply side of the distribution line and the output end of the generator via a second circuit breaker, and after the power supply side is restored, When the power supply side distribution line to which the second connectable / disconnectable means is connected and the generator side are synchronously detected by the synchronous detection means, the second circuit breaker is turned on and the distribution from the generator side is performed. Means for shifting the load to the power supply side of the wire; Power switching device of the power distribution system by the power generator wheel, characterized in that it includes.

[0025]

FIG. 1 is a single-line connection diagram showing an embodiment of the present invention, and portions equivalent to those in FIG. 2 are denoted by the same reference numerals.

In FIG. 1, the circuit portion from the hot-line connection clamp 11A to the disconnector 10 and the circuit breaker 9 indicated by the broken line block A is used when the pole switch 2 is restored at the end of distribution line construction. This is an unused part when switching from the power supply side of the distribution line to the generator vehicle side.

The clamp-type current sensor 21 is temporarily installed near the pole switch 2 (open portion of the live line) and detects a distribution line current supplied from the distribution line 1 to the load. The distribution line current detection means 22 takes in the distribution line current detected by the current sensor 21.

The live line connection clamp 8A connects the distribution line to the output end of the generator via the circuit breaker 6 on the load side of the live line open portion and at a position downstream of the current sensor. The generator current detecting means 23 detects an output current of the generator 5.

The phase detection confirmation by the phase detection confirmation means 17 and the synchronization detection by the synchronization detection means 19 are performed by the voltage signal of the transformer 13.

The procedure for switching the pole switch 2 without interruption during distribution line construction will be described below.

(1) The operator operates the connection between each phase of the output terminal 8 and each phase of the distribution line 1 by using the live wire connection clamp 8A connected to the generator car, and closes the disconnector 7 I do. In addition, the current sensor 21 is temporarily provided upstream of the live line connection clamp 8A.

(2) The operator confirms with the phase detection confirmation means 17 that there is no error in the phase sequence in the connection operation by the live line connection clamp 8A.

(3) From the live current connection clamp 8A and the load current detected by the distribution line current detecting means 22, it is confirmed that the current load current is equal to or less than the rated current of the generator 5.

(4) After confirming the load current, the synchronous detection of the output of the generator 5 in operation and the output of the distribution line 1 is performed. This synchronization detection is performed based on the detection voltage signal from the transformer 13 and the detection voltage signal from the transformer 14.
9, the circuit breaker 6 is turned on upon detection of the synchronization.

(5) After the above synchronization, the output of the prime mover 4 is gradually increased to increase the power generated by the generator 5, and the current supplied to the load is gradually increased from the power supply side of the distribution line to the generator side. Move to This load shift is performed while confirming the load shift from the distribution line current detecting means 22 to the generator current detecting means 23.

(6) After the above-mentioned load transfer is completed, the pole switch 2 is opened, and the power supply from the generator 5 to the load is continued.

Therefore, the uninterruptible switching of the generator car according to the present embodiment is performed by connecting the live line connection clamp 8A to the load side after confirming the phase detection and detecting the load current by the clamp type current sensor to generate the load amount. Confirm that the current is smaller than the rated current of the locomotive, and execute load transition to supply power from the generator car to the load via the hot-line connection clamp 8A while supplying power to the load from the power supply side of the distribution line through the live-line open portion. Then, the pole switch 2 is opened when the load transfer is completed.

As a result, the connection between the generator car 3 and the distribution line 1 requires only the work of connecting the hot wire connection clamp 8A and the clamp type current sensor 21, and the connection work by the hot wire connection clamp 11A becomes unnecessary.

At the end of the distribution line construction, the block A is used to restore the power from the generator car 3 to the power supply side of the distribution line. This is realized by phase confirmation, synchronization detection, closing of the circuit breaker 9, load transfer, and closing of the pole switch 2. That is, the power supply side of the distribution line is connected to the output end of the generator 5 through the circuit breaker (open state) 9 by the connection of the live line connection clamp 11A, and after the power supply side is restored, the power supply side distribution line is connected to the power generation side. When the synchronization of the generator 5 is detected by the synchronization detecting means 19, the circuit breaker 9 is turned on, and a load amount to be supplied to the load is distributed from the generator 5 based on the detected value of the generator current detected by the current transformer 15. The load is shifted to the power source side of the electric wire, and after the load shift is completed, the pole switch 2 is turned on and the live connection clamps 8A and 11A are separated from the distribution line.

In the method and apparatus for switching the power supply for detecting the power distribution by the generator vehicle, which constitutes the work and the control procedure as described above, the load transfer is performed based on the distribution line current and the generator current. And the power amount based on the voltage signal. Further, at the time of power restoration, load transfer operation and control can be omitted, and load transfer can be obtained by connecting the power supply side of the distribution line and the output side of the generator in parallel by turning on the circuit breaker 9 after synchronization detection. . The transmission of the detection current from the current sensor 21 to the distribution line current detection means 22 may be either wired or wireless.

Further, a series of operation procedures of the worker in the embodiment can be replaced by the control device 24 indicated by a broken line block. In this case, the control device 24 includes a procedure for performing a series of processing and control for uninterruptible power switching after the worker finishes the work of connecting the live wire connection clamp 8A and the clamp type current sensor 21 to the distribution line 1. That is, the control device sequentially executes the phase detection confirmation process, the load current confirmation process, the synchronization detection process, the operation control of the generator 5, the closing control of the circuit breaker 6, and the load transition control in order. The operator is notified that the pole switch 2 can be opened. Similarly, a series of processing and control for power restoration from the generator vehicle side to the distribution line side can be replaced by the control device 24.

[0042]

As described above, according to the present invention, the uninterruptible switching from the power supply side of the distribution line to the generator vehicle side requires the connection and disconnection.
It is only necessary to connect the live line connection clamp 8A serving as the disconnectable means and the clamp type current sensor 21 for detecting the distribution line current, and the clamp type current sensor 21 is a simple operation of simply clamping the distribution line. In order to connect to both the power supply side and the load side of the conventional pole switch using a pair of connectable / disconnectable means, and to temporarily disconnect the connectable / disconnectable means on the power supply side at the start of distribution line construction In comparison, the operation can be greatly simplified.

[Brief description of the drawings]

FIG. 1 is a single-line connection diagram of a generator vehicle and a power distribution system according to an embodiment of the present invention.

FIG. 2 is a single-line connection diagram between a conventional generator car and a power distribution system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Distribution line 2 ... Pole switch 3 ... Generator car 5 ... Generator 6, 9 ... Breaker 7, 10 ... Disconnector 8 ... Output end, 8A, 11A ... Live line connection clamp 11 ... Input end 17 ... Inspection Phase checking means 19 ... Synchronization detecting means 21 ... Clamp type current sensor 22 ... Distribution line current detecting means 23 ... Generator current detecting means 24 ... Control device

Continued on the front page (72) Inventor Junichi Takahashi 2-1-1-17 Osaki, Shinagawa-ku, Tokyo F-term in Meidensha Co., Ltd. 5G015 FA10 FA18 GA17 HA14 JA05 JA34 JA35 JA67 5G066 AA10 AB02 AC02 BA01 HA01 HA06 HB02 LA01

Claims (3)

[Claims] 1. A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker; synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator; When a generator vehicle having a distribution line current supplied to a load and current detection means for respectively detecting the output current of the generator is provided near an open portion of a live line of the distribution line when performing uninterrupted work on the distribution line. A method of switching power from a power distribution system by a generator vehicle that temporarily arranges power supply from the generator to the load without power interruption instead of power supply to the load from the power supply side of the distribution line. Temporarily mounting a clamp-type current sensor on the distribution line in the vicinity of the live line open part, taking in the distribution line current detected by the current sensor into distribution line current detection means of the generator car, Confirm that the distribution line current detected by the detection means is equal to or less than the rated current of the generator, and the distribution line and the output terminal of the generator at a position downstream of the current sensor on the load side of the live-line open portion. Are connected by disconnectable means, and the circuit breaker is turned on by the synchronization signal detected by the synchronous detection means of the generator vehicle in the operating state of the generator, the distribution line current detection means and the generator Generating a load from the power supply side of the distribution line to the generator side based on a detection value of a current detection unit, and opening the hot-line open portion after the load transfer is completed. How to switch the power supply to the distribution system by locomotive. 2. A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker; synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator; When a generator vehicle having a distribution line current supplied to a load and current detection means for respectively detecting the output current of the generator is provided near an open portion of a live line of the distribution line when performing uninterrupted work on the distribution line. And temporarily switch to power supply from the generator to the load without interruption, instead of power supply from the power supply side of the distribution line to the load, and then switch from the generator to the power supply side of the distribution line A method of switching power from a power distribution system by a generator vehicle that supplies power to a load, wherein a temporary clamp-type current sensor is provided on the distribution line near the hot-line open portion, and the power distribution detected by the current sensor is provided. The current is taken into the distribution line current detection means of the generator car, and the distribution line current detected by the distribution line current detection means is confirmed to be equal to or less than the rated current of the generator. A first connection between the distribution line and the output end of the generator at a position downstream of the current sensor on the side
The breaker is turned on by a synchronization signal detected by the synchronization detection means of the generator car in the operating state of the generator, the distribution line current detection means and the generator current detection means The load amount to be supplied to the load is shifted from the power supply side of the distribution line to the generator side based on the detected value of the distribution line. During power supply to the load, the power supply side of the distribution line and the output end of the generator are connected by a second connectable / disconnectable means via a second circuit breaker, and after the power supply side is restored, When the power supply side distribution line to which the second connectable / disconnectable means is connected and the generator side are synchronously detected by the synchronous detection means, the second circuit breaker is turned on and the distribution from the generator side is performed. Load transfer to the power supply side of the wire A method of switching the power supply to a power distribution system by a generator vehicle, wherein the hot-line open portion is turned on after the load transfer is completed, and the first and second connectable / disconnectable means are disconnected from the distribution line. . 3. A generator driven by a prime mover and capable of supplying power to a load via a circuit breaker; synchronization detecting means for detecting synchronization between a power supply voltage of a distribution line and an output voltage of the generator; And a current detecting means for respectively detecting a distribution line current supplied to the load and an output current of the generator, and arranged near a live line open portion of the distribution line when performing uninterrupted construction of the distribution line. A generator vehicle, a clamp-type current sensor that is temporarily installed near the open portion of the live line and detects a distribution line current supplied to the load from the distribution line, and a distribution line current that captures the distribution line current detected by the current sensor. Detecting means for detecting that the distribution line current detected by the distribution line current detecting means is equal to or less than the rated current of the generator; and A first connectable / disconnectable means for connecting the distribution line and the output end of the generator at a downstream position, and a synchronous signal detected by the synchronous detection means of the generator vehicle in an operation state of the generator. Means for turning on a circuit breaker; and loading the amount of load supplied to the load from the power supply side of the distribution line to the generator side based on the detection values of the distribution line current detection means and the generator current detection means. Means for shifting, a second connectable / disconnectable means capable of connecting a power supply side of the distribution line and an output end of the generator via a second circuit breaker, and When the synchronous detection means detects the synchronization between the power supply distribution line to which the second connection / disconnection means is connected and the generator side, the second circuit breaker is turned on to connect the power distribution line from the generator side. Means for shifting the load to the power supply side. Power switching device of the power distribution system by the power generator vehicles characterized and.