JPH11136851A - Reclosing circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To forcibly inhibit the formation of a reclosed circuit when its breaking fails. SOLUTION: When a differential relay 16, an overcurrent relay 18, and a fault detection relay 22 are actuated in the case of a fault of a power system, AND gates 24, 28, 30 output respective signals '1', a breaking command is issued to a circuit-breaker tripping portion 48 via an OR gate 34 to execute the breaking of the circuit breaker. At this time, the timer of a breaking-failure detection portion 50 is actuated, a signal is from the portion 50 inputted to a breaking-command inputting portion 20 when an overcurrent relay 18 is not restored to its original state even after the lapse of a specified time to output a signal '1' from an AND gate 26. This signal is outputted to the opposite party via commnicating portions 32, 46 and is outputted also to an OR gate 40. As a reset, resetting the stored content of a storage circuit 42, the execution of the reclosing of the power system by a reclosing-circuit executing portion 44 is locked forcibly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclosing circuit device, and more particularly, to a circuit breaker installed on a power transmission line of a power system, and then turning on the circuit breaker under certain conditions. The present invention relates to a reclosing circuit device suitable for forming a reclosing circuit.

[0002]

2. Description of the Related Art Conventionally, a transmission line of a power system is provided with a protection relay device for each section to be protected, and a breaker installed in the section to be protected when the transmission line is grounded or short-circuited. , And then the circuit breaker is turned on again under certain conditions to form a reclosing circuit.
As the reclosing function in this protection relay device, for example, as described in “Latest Control System Series 6 Protection Relay System”, page 152 (published by Denki Shoin), the conditions under which a disconnection command is given to a circuit breaker are given. A method of re-closing a circuit breaker based on a combination of conditions of whether or not re-closing is possible is known.

[0003]

In the prior art, as a condition for locking the reclosing circuit, when a shutoff command to the circuit breaker is output, the reclosing circuit is locked only when the system is not in such a condition that the reclosing can be performed. Therefore, even when the interruption of the circuit breaker fails, when both of the above conditions are satisfied, the reclosing is performed and a shock may be applied to the system. That is, in the prior art, a disconnection failure detection device is provided in addition to the protection relay device, and in the event of a system accident, a disconnection command is given to the circuit breaker by the operation of the protection relay device to determine whether the circuit breaker has been reliably disconnected. Is monitored by the disconnection failure detection device, and if the disconnection of the circuit breaker fails, a disconnection failure detection signal is transmitted from the disconnection failure detection device to the protection relay device, and based on this signal, the protection relay device transmits the signal to the circuit breaker again. A configuration for giving a shutoff command is employed. However, even when a shutoff command is issued at the time of shutoff failure, if the condition for reclosing is satisfied, the reclosure is started, and the circuit breaker may be turned on again in a state where the system fault has not been eliminated.

As a countermeasure, a disconnection failure detection signal generator is provided for each line in the disconnection failure detector, and the disconnection failure detection signal generator for each line is connected to the protection relay device for each line via a signal line. In addition, there has been proposed a method of forcibly prohibiting the activation of the reclosing circuit and locking the reclosing circuit even if a disconnection command is output when the disconnection fails.

However, in this method, the protection relay device of each line is connected to a cut-off failure detection signal generation unit of the cut-off failure detection device via a signal line, or the cut-off failure detection signal generation unit is connected to the cut-off failure detection device. In the case of an existing device, the interruption failure detection device cannot be used while the interruption failure detection device is modified.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reclosing circuit device which can surely inhibit the formation of a reclosing circuit when a disconnection fails.

[0007]

In order to achieve the above object, the present invention provides an abnormality detecting means for detecting that an abnormality has occurred in a section to be protected of an electric power system, and an interruption provided in the section to be protected. Re-closing means for re-closing the circuit breaker when the re-closing condition is satisfied after the circuit breaker has been executed, and a cut-off success determination means for detecting whether or not the circuit breaker has been successfully cut off, Interruption failure detection means for outputting an interruption failure detection signal when a positive judgment output is not generated from the interruption success judgment means even after a lapse of a fixed time after the interruption to the circuit breaker, and the abnormality detection means A re-inhibition means for inhibiting re-injection by the re-injection means on the basis of the detection output of, the negative judgment output of the interruption success determination means and the logic of the interruption failure detection signal of the interruption failure detection means. Closed circuit It is obtained by constituting the apparatus.

In configuring the reclosing circuit device, as a re-closing prohibiting means, a logical product of a detection output of the abnormality detecting means, a negative judgment output of the shutting success judging means and a shutting failure detection signal of the shutting failure detecting means is used. The condition may be provided with a function of prohibiting re-entry by the re-entry means. Further, a re-entry prohibition means is transmitted to the other end using the communication means to the re-entry prohibition means, and the re-entry to the other end re-entry means for re-entering the other end circuit breaker associated with the breaker is performed. A prohibition function can be added.

Further, according to the present invention, assuming that the relay is a main component, the current of the self-end breaker installed in the protection target section of the power system and the current of the other end breaker related to the self-end breaker are determined. A differential relay that operates when an error occurs in the difference,
An overcurrent relay that operates when an overcurrent flows through the self-end circuit breaker, an accident detection relay that operates when an accident occurs in the power system, and interruption of the self-end breaker has been performed. A re-closing means for re-closing the self-end circuit breaker when a post-re-closing condition is satisfied; and a start-up on condition that a logical product of the operation of the differential relay, the operation of the overcurrent relay, and the operation of the fault detection relay are provided. And a disconnection failure detection unit that outputs a disconnection failure detection signal indicating that the disconnection of the self-end circuit breaker has failed when the condition of the logical product is satisfied for a predetermined time or more after the start-up, and A re-closing circuit device comprising a re-entry prohibiting means for prohibiting re-entry by the re-entry means on condition of a logical product of the operation, the operation of the overcurrent relay, and the generation of the interruption failure detection signal. is there.

When the reclose circuit device is configured, a re-entry prohibition command is transmitted to the re-entry end using the communication means to the re-entry prohibiting means, and the opponent end re-entry means for re-entrying the opposing end circuit breaker. A function to prohibit re-input can be added.

In configuring each of the reclosing circuit devices, the following elements can be added.

The function of the on-delay timer or the off-delay timer or the function of both the on-delay timer and the off-delay timer is added to the condition of the logical product of the re-inhibition means.

According to the above-mentioned means, when an interruption failure detection signal is generated after a lapse of a certain period of time after the breaker is interrupted after an abnormality such as an accident or a failure has occurred in the section to be protected of the power system, the abnormality is detected. It shuts off based on the detection output of the detection means (operation of the activation relay), the negative judgment output of the interruption success determination means (operation of the overcurrent relay), and the logic (logical product) of generation of the interruption failure detection signal of the interruption failure detection means. Since the re-closing circuit is prohibited, it is possible to reliably prevent the formation of a reclosing circuit when disconnection fails, and to prevent the occurrence of an abnormality in the system due to the formation of an unnecessary reclosing circuit. Can be.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a power system protection system. In FIG. 1, the power system protection system includes:
The protection relay device 10 includes a protection relay device 10, a protection failure detection device 14, and the protection relay device 10 is connected to the protection relay device 12 via a signal line 100. Is the signal line 102,
104. Note that FIG. 1 shows only the configuration corresponding to one line of the three-phase transmission line with respect to the protection relay devices 10 and 12, and the protection relay devices 10 and 12 have the same configuration. The configuration of the protection relay device 10 will be described.

The protection relay device 10 is provided for controlling the operation of a breaker (not shown) of a self-end installed in a section to be protected in a transmission line of a power system. The other end of the circuit breaker (circuit breaker connected to the same transmission line: not shown) associated with the protection relay device 12
The operation is controlled by the The protection relay device 10 includes a differential relay (ratio differential relay: 87 relays) 1 for controlling the operation of its own circuit breaker.
6, overcurrent relay (51 relay) 18, cut-off command input unit 20, accident detection relay (FD relay) 22, AND gates 24, 26, 28, 30, communication unit (communication means) 32,
OR gate 34, reclosing starter 36, failure information input unit 38, OR gate 40, storage circuit (flip-flop)
42, a re-closing circuit execution unit 44,
The communication unit 32 is connected to the protection relay device 1 via the signal line 100.
2, the OR gate 34 is connected to the circuit breaker trip unit 48, the shutoff command input unit 20 is connected to the shutoff failure detection unit 50 of the shutoff failure detection device 14 via the signal line 102, and AND The output of the gate 30 is the signal line 10
4 are connected to the interruption failure detection unit 50, respectively.

The differential relay 16 has a value detected by a current detector (not shown) for detecting a current flowing through its own circuit breaker and a current detector (not shown) for detecting a current flowing through the circuit breaker at the other end. When the deviation of the detected value exceeds the set value, it is detected that an abnormality such as a failure or an accident has occurred in the protection target section. That is, the differential relay 16 is configured as an abnormality detection unit that operates when an abnormality such as a failure or an accident occurs in the protection target section of the power system and detects that an abnormality has occurred in the protection target section. While an abnormality occurs, a signal of "1" is output to the AND gates 24, 28, and 30. When the transmission line in the protection target section returns from the abnormal state to the normal state, the signal returns to the original state and " A signal of "0" is output. The overcurrent relay 18 operates when an overcurrent flows through the transmission line in the protection target section, and outputs a signal of "1" to the AND gates 24 and 30, so that the current flowing through the transmission line becomes equal to or less than the overcurrent set value. At the time of return to the original state, and outputs a signal of "0". That is, the overcurrent relay 18 operates according to the overcurrent, and when the interruption to the own end circuit breaker is executed and the interruption fails and an arc is generated in the circuit breaker, the overcurrent relay 18 is activated by the overcurrent. , And is a relay that returns to the original state when the breaker is surely shut off, and is configured as shut-off success determination means for detecting whether or not the shut-off of the breaker was successful. Note that the overcurrent relay 18 is configured to return to the original state at the earliest time when the other relays 16 and 22 are normal.

The shutoff command input unit 20 inputs a shutoff command ("1" signal) from a shutoff command generator (not shown) for generating a shutoff command in the event of a bus accident, and a signal line 10.
2, the interruption failure detection signal (signal "1") from the interruption failure detection unit 50 is input, and in response to the inputted interruption instruction or interruption failure detection signal, the signal "1" is output to the AND gate 26 and the OR gate 26. The data is output to the gate 34. The accident detection relay 22 is activated when an accident occurs in the power system, for example, when the voltage of the system falls below a set voltage, and outputs a “1” signal to the AND gates 28 and 30 during this operation. It is supposed to.

The AND gate 24 outputs a signal of "1" to the AND gate 26 on condition of the logical product of the operation of the differential relay 16 and the operation of the overcurrent relay 18, and the AND gate 26 outputs the signal from the AND gate 24. (“1” signal) and a cutoff failure detection signal (“1” signal) from the cutoff command input unit 20
The signal of "1" is output to the communication unit 32 and to the OR gate 40 on condition of the logical product of the two. This signal is output as a signal for inhibiting the re-input of the circuit breaker at the own end and the circuit breaker at the other end. AND
The gate 28 operates the differential relay 16 and the accident detection relay 2.
A signal of "1" is output to the OR gate 34 on condition of a logical product with the operation of the second. When a signal of “1” is output from the cutoff command input unit 20, the OR gate 34 outputs
Alternatively, when a signal “1” is output from the AND gate 28, the signal “1” is output to the circuit breaker trip unit 48. The breaker trip unit 48 is configured as a breaking unit that trips (breaks) the breaker at its own end when the signal of “1” is output from the OR gate 34. The AND gate 30 outputs a signal of “1” to the interruption failure detection unit 50 as a logical product of the operation of the differential relay 16, the operation of the overcurrent relay 18, and the operation of the accident detection relay 22. The AND gate 30 outputs a signal of "1" when all the relays 16, 18, and 22 are operated, and outputs a signal of "0" when any of the relays returns to the original state. Output. The interruption failure detection unit 50 is configured to have a function as a timer. The interruption failure detection unit 50 activates the timer when a signal of “1” is input from the signal line 104, and “AND” is output from the AND gate 30 even after a certain time has elapsed. When the signal “1” is input, it is determined that the cutoff of the circuit breaker at its own end has failed, and a cutoff failure detection signal is output to the signal line 102. That is, the AND gate 30 and the interruption failure detection unit
Is a failure to output a failure detection signal when the overcurrent relay does not return to its original state (when a positive judgment output does not occur) even after a certain period of time has elapsed after the circuit breaker at its end has been disconnected. It is configured as detection means.

The reclosing start-up section 36 is instructed to shut off the circuit breaker at its own end, and on the condition that the reclosing condition is satisfied based on information from the other end or the neighboring line. A start command is output to the storage circuit 42 to set the storage circuit 42. After the start command is stored in the storage circuit 42, if the start command is not reset even after the set time elapses, the breaker at its own end is turned on again by the execution of the reclose circuit execution unit 44. That is, the reclosing starter 3
6. The storage circuit 42 and the reclosing circuit execution unit 44 are configured as re-closing means.

On the other hand, the unsatisfied information input section 38 is input with information such as a cooperative condition which is a disconnection condition of the other end or the adjacent line, and the reclose condition is not satisfied. When information such as the line is not electrically connected is input, a reset signal of "1" is output to the OR gate 40. The OR gate 40 outputs a reset signal of “1” to the storage circuit 42 when a signal of “1” is input from any of the AND gate 26, the communication unit 32, and the failure information input unit 38, and Is reset. When the start command of the storage circuit 42 is reset, the start of the reclosing is forcibly prohibited. That is, the AND gates 24 and 26, the communication unit 3
2, 46, the failure information input section 38, the OR gate 40, and the storage circuit 42 are configured as re-entry prohibition means for forcibly prohibiting re-entry of the breaker at its own end. The output signal of the AND gate 26 is transmitted to the communication unit 46 via the communication unit 32 and the signal line 100, and is used as a signal for locking the reclosing circuit of the other end.
6, the communication units 32 and 46, the failure information input unit 38, the OR gate 40, and the storage circuit 42 are also configured as re-entry prohibiting means for forcibly prohibiting re-entry of the circuit breaker at the other end.

In the above configuration, if an accident such as a ground fault or a short circuit occurs in the power transmission line in the protection target section of the protection relay device 10, and the differential relay 16, the overcurrent relay 18, and the accident detection relay 22 are all activated. , AND gate 24, 2
Signals of “1” are output from 8 and 30, respectively. AN
When a signal of “1” is output from the OR gate 34 in response to the signal from the D gate 28, the breaker trip unit 48 performs cutoff for the breaker at its own end. If the overcurrent relay 18 returns to its original state before a predetermined time has elapsed (before the interruption failure detection signal is output from the interruption failure detection unit 50), the interruption of the breaker at its own end is surely executed. As a result, the output of the AND gate 30 changes from “1” to “0”.
Flip to Further, when the reclosing condition is satisfied, the activation command is set in the storage circuit 42 by the activation of the reclosing activation unit 36, and the circuit breaker at the own end is reclosed by the reclosing circuit execution unit 44 to form a reclosing circuit. Will be.

On the other hand, even if a certain period of time has elapsed after the breaker of the self-end circuit breaker is executed, the overcurrent relay 18 does not return to the original state, and the signal of "1" is output from the AND gate 30. Is continuously output, a signal of “1” is output from the interruption failure detection unit 50, and an interruption failure detection signal is output from the interruption instruction input unit 20. When this signal occurs,
The shutoff command is output to the breaker trip unit 48 again, and the condition of the logical product of the AND gate 26 is satisfied.
The signal of “1” is output to the communication unit 46 via the communication unit 32 and the signal line 100, and is also output to the OR gate 40. When the signal of "1" is output from the OR gate 40, the contents stored in the storage circuit 42 are reset, and the activation of the reclosing circuit is forcibly prohibited. That is, the formation of the reclosing circuit is forcibly locked. Therefore, it is possible to prevent a shock or the like from being applied to the system due to the reclosing when the disconnection fails.

In the present embodiment, a cut-off failure detection signal generator is provided for each line with respect to the cut-off failure detector 14, or each cut-off failure detection signal generator is connected to the protection relay device 10 via a signal line. The protection relay device 10 is connected to the AND gates 24 and 26 without any modification of
The means for locking the reclosing circuit when the interruption has failed can be constituted only by providing the above.

In the above embodiment, the AND gate 2
4 and 26, a signal for generating a signal for locking the reclosing circuit has been described. In order to determine the logical product of the differential relay 16, the overcurrent relay 18, and the cutoff command input unit 20, an AND gate 24 is provided. , 26 instead of 3 inputs AND
A gate can also be used. Further, a configuration in which a 4-input AND gate is used instead of the 3-input AND gate and the output of the accident detection relay 22 is input to the 4-input AND gate can be adopted.

In the above-described embodiment, the protection relay device 1 is unnecessary due to the variation in the operation of the relay at the time of interruption.
In order not to detect a blocking failure at 0 and 12, A
An on-delay timer function can be added to the output side of the ND gate 24 or AND gate 26. Further, in order to cope with the limit operation of the relay, a circuit having an on-delay timer or an off-delay timer is added to the output side of the AND gate 24 or the AND gate 26. Or a circuit having the function described above.

In the above-described embodiment, the reclosing circuit of the self-end circuit breaker and the reclosing circuit of the other end are locked based on the signal generated from the AND gate 26.
When a signal generated by the protection relay device 12 at the other end is input to the communication unit 32, the reclosing circuit at the own end can be locked by this signal.

Further, in the above embodiment, the protection relay devices 10 and 12 having the communication units 32 and 46 have been described. However, the present invention can be applied to a protection relay device not provided with the communication units 32 and 46. it can.

[0029]

As described above, according to the present invention,
When the disconnection fails, the re-input of the circuit breaker is forcibly prohibited, so that it is possible to prevent the occurrence of a failure in the system due to the formation of a reclose circuit when the disconnection fails.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power system protection system according to an embodiment of the present invention.

[Explanation of symbols]

 10, 12 protection relay device 14 interruption failure detection device 16 differential relay 18 overcurrent relay 22 accident detection relay 24, 26, 28, 30 AND gate 32 communication unit 34 OR gate 36 reclosing circuit starting unit 38 failure information input unit 40 OR Gate 42 Storage circuit 44 Reclosing circuit execution unit 48 Circuit breaker trip unit 50 Interruption failure detection unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jun Noro 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Kiyotaka Shinohara 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Kokubu Plant of Hitachi, Ltd.

Claims (6)

[Claims] 1. An abnormality detecting means for detecting that an abnormality has occurred in a section to be protected of an electric power system, and a re-closing condition is satisfied after a circuit breaker installed in the section to be protected is shut down. Re-closing means for re-closing the circuit breaker, disconnection success determination means for detecting whether or not the circuit breaker has been successfully disconnected, and elapse of a predetermined time after the circuit breaker is disconnected. Even when the interruption success determination means does not generate a positive determination output, an interruption failure detection means that outputs a failure detection signal, a detection output of the abnormality detection means, a negative determination output of the interruption success determination means, and A reclose circuit prohibiting means for prohibiting re-input by the re-input means based on a logic of a cut-off failure detection signal of the cut-off failure detecting means. 2. An abnormality detecting means for detecting that an abnormality has occurred in a section to be protected of a power system, and a re-closing condition is satisfied after a circuit breaker installed in the section to be protected is shut down. Re-closing means for re-closing the circuit breaker, disconnection success determination means for detecting whether or not the circuit breaker has been successfully disconnected, and elapse of a predetermined time after the circuit breaker is disconnected. Even when the interruption success determination means does not generate a positive determination output, an interruption failure detection means that outputs a failure detection signal, a detection output of the abnormality detection means, a negative determination output of the interruption success determination means, and A re-closing circuit device comprising: a re-entry prohibition unit that prohibits re-entry by the re-entry unit on condition of a logical product of an interruption failure detection signal of the interruption failure detection unit. 3. An abnormality detecting means for detecting that an abnormality has occurred in a section to be protected of a power system, and a re-closing condition is satisfied after a circuit breaker installed in the section to be protected is shut down. Re-closing means for re-closing the circuit breaker, disconnection success determination means for detecting whether or not the circuit breaker has been successfully disconnected, and elapse of a predetermined time after the circuit breaker is disconnected. Even when the interruption success determination means does not generate a positive determination output, an interruption failure detection means that outputs a failure detection signal, a detection output of the abnormality detection means, a negative determination output of the interruption success determination means, and The re-entry by the re-entry means is prohibited under the condition of the logical product of the interruption failure detection signals of the interruption failure detection means, and a re-entry prohibition command is transmitted to the other end using the communication means, and has a connection with the breaker Other end And a re-inhibition means for prohibiting re-injection of the re-injection means for the other end. 4. A differential relay that is activated when an abnormality occurs in a difference between a current of a self-end breaker installed in a protection target section of a power system and a current of a mating end breaker related to the self-end breaker. ,
An overcurrent relay that operates when an overcurrent flows through the self-end circuit breaker, an accident detection relay that operates when an accident occurs in the power system, and interruption of the self-end breaker has been performed. A re-closing means for re-closing the self-end circuit breaker when a post-re-closing condition is satisfied; and a start-up on condition that a logical product of the operation of the differential relay, the operation of the overcurrent relay, and the operation of the fault detection relay are provided. And a disconnection failure detection unit that outputs a disconnection failure detection signal indicating that the disconnection of the self-end circuit breaker has failed when the condition of the logical product is satisfied for a predetermined time or more after the start-up, and A reclose circuit prohibiting means for prohibiting re-input by the re-input means on condition of a logical product of the operation, the operation of the overcurrent relay, and the generation of the interruption failure detection signal. 5. A differential relay that operates when an abnormality occurs in a difference between a current of a self-end breaker installed in a protection target section of a power system and a current of a counterpart breaker related to the self-end breaker. ,
An overcurrent relay that operates when an overcurrent flows through the self-end circuit breaker, an accident detection relay that operates when an accident occurs in the power system, and interruption of the self-end breaker has been performed. A re-closing means for re-closing the self-end circuit breaker when a post-re-closing condition is satisfied; and a start-up on condition that a logical product of the operation of the differential relay, the operation of the overcurrent relay, and the operation of the fault detection relay are provided. And a disconnection failure detection unit that outputs a disconnection failure detection signal indicating that the disconnection of the self-end circuit breaker has failed when the condition of the logical product is satisfied for a predetermined time or more after the start-up, and While prohibiting re-entry by the re-entry means under the condition of the logical product of the operation and the operation of the overcurrent relay and the generation of the interruption failure detection signal, a re-entry prohibition command is transmitted to the other end using the communication means, The other end shield Reclosing circuit device and a re-feeding inhibition means for inhibiting the cycling against reintroduction means for remote end to cycle the vessel. 6. An on-delay timer or an off-delay timer function or a function of both an on-delay timer and an off-delay timer is added to the condition of the logical product of the re-inhibition means. 6. The reclosing circuit device according to 4 or 5.