JP3374211B2 - Reclosing circuit device - Google Patents

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 in particular, after tripping a circuit breaker installed in a power transmission line of a power system, the circuit breaker is reclosed 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 circuit breaker installed in the section to be protected when the transmission line is grounded or short-circuited. Is tripped, and then the circuit breaker is reclosed under a certain condition to form a reclosed 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), A method is known in which the circuit breaker is reclosed depending on the combination of conditions regarding whether or not reclosing is possible.

[0003]

In the prior art, as a condition for locking the reclosed circuit, the reclosed circuit is locked only when the system is not reclosed when the breaker command is output to the circuit breaker. Therefore, even if the circuit breaker fails to shut down, if both of the above conditions are met, reclosing may be performed and shock may be given to the system. That is, in the prior art, a disconnection failure detection device is provided in addition to the protection relay device, and when a system fault occurs, the protection relay device is actuated to give a disconnection command to the circuit breaker to determine whether or not the circuit breaker has reliably disconnected. Is detected by the disconnection failure detection device, and when the circuit breaker fails to be disconnected, the disconnection failure detection device transmits a disconnection failure detection signal to the protection relay device, and based on this signal, the protection relay device returns to the circuit breaker. A configuration that gives a cutoff command is adopted. However, even when a disconnection command is issued at the time of failure in disconnection, reclosing is activated if the condition for reclosing is satisfied, and the circuit breaker may be reclosed even if the system fault has not been eliminated.

As a countermeasure against this, the disconnection failure detection device is provided with a disconnection failure detection signal generation unit for each line, and the disconnection failure detection signal generation unit for each line and the protection relay device for each line are connected via a signal line. A method has been proposed in which even if a cutoff command is output when the cutoff fails, the start of the reclosing is forcibly prohibited and the reclosing is locked.

However, in this method, the protection relay device of each line and the disconnection failure detection signal generator of the disconnection failure detector are connected via a signal line, or the disconnection failure detection signal generator is connected to the disconnection failure detector. In the case of an existing device, the interruption failure detection device cannot be used while the interruption failure detection device is modified.

It is an object of the present invention to provide a reclosing circuit device which can surely prevent the formation of a reclosing circuit when the disconnection fails.

[0007]

[0008]

[0009]

[Means for Solving the Problems] To achieve the above object
In the present invention, the relay as a main component,
A differential relay that operates when an error occurs in the difference between the current of the self-end circuit breaker installed in the protected section of the power system and the current of the other end circuit breaker related to the self-end circuit breaker; Overcurrent relay that operates when an overcurrent flows through the switch, an accident detection relay that operates when an accident occurs in the power system, and a reclosing condition after a disconnection is performed on the self-end circuit breaker. When the condition is satisfied, the reclosing means for reclosing the self-end circuit breaker, and the activation of the differential relay, the operation of the overcurrent relay, and the operation of the accident detection relay are activated on the condition that 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 certain time or more, the operation of the differential relay and the excess Activation of current relay and failure of said interruption It is obtained by constituting output signal of the re-closure circuit device and a re-feeding inhibition means for inhibiting the reintroduction by the reintroduction means the logical product to the conditions of occurrence.

In constructing the reclosing circuit device, the re-closing prohibiting means transmits a re-closing prohibiting command to the other end using the communication means, and re-closes the other end circuit breaker. It is possible to add a function of prohibiting re-inputting.

In constructing 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 functions of both the on-delay timer and the off-delay timer are added to the condition of the logical product of the re-closing prohibiting means.

According to the above-mentioned means, when the breaker failure detection signal is generated after a lapse of a certain time after the breaker is cut off due to an abnormality such as an accident or a failure in the section to be protected of the power system, the abnormality occurs. Interruption based on the detection output of the detection means (operation of the operation relay), the negative determination output of the interruption success determination means (operation of the overcurrent relay), and the logic (logical product) of the interruption failure detection signal of the interruption failure detection means Since the reclosing of the power supply is prohibited, it is possible to surely prevent the reclosing circuit from being formed when the disconnection fails, and to prevent the occurrence of abnormalities in the system due to unnecessary formation of the reclosing circuit. You can

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An 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 is
The protection relay devices 10 and 12 and the disconnection failure detection device 14 are provided. The protection relay device 10 and the protection relay device 12 are connected via a signal line 100, and the protection relay device 10 and the disconnection failure detection device 14 are connected. And signal line 102,
It is connected via 104. Note that, in FIG. 1, the protection relay devices 10 and 12 show only the configuration corresponding to one line of the three-phase transmission line, and since 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 to control the operation of a circuit breaker (not shown) at the self-end installed in the protected section of the power transmission line of the power system. The other end 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 protective relay device 10 controls the operation of the circuit breaker at its own end by using a differential relay (ratio differential relay: 87 relays) 1
6, overcurrent relay (51 relay) 18, cutoff 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 circuit activation section 36, failure information input section 38, OR gate 40, storage circuit (flip-flop)
42 and a reclosing circuit execution unit 44,
The communication unit 32 transmits the protection relay device 1 via the signal line 100.
2 is connected to the communication unit 46, the OR gate 34 is connected to the breaker trip unit 48, the cutoff command input unit 20 is connected to the cutoff failure detection unit 50 of the cutoff failure detection device 14 via the signal line 102, and AND The output of the gate 30 is the signal line 10
4 are respectively connected to the disconnection failure detection unit 50.

The differential relay 16 includes a detection value of a current detector (not shown) for detecting the current flowing through the breaker at its own end and a current detector (not shown) for detecting the current flowing through the 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 detecting 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 the protection target section has an abnormality. While the abnormality is occurring, a signal of "1" is output to the AND gates 24, 28 and 30, and when the transmission line in the protection target section returns from the abnormal state to the normal state, it returns to the original state and " It outputs a 0 "signal. The overcurrent relay 18 operates when an overcurrent flows in the power transmission line in the protection target section, outputs a signal of “1” to the AND gates 24 and 30, and the current flowing through the power transmission line becomes equal to or less than the overcurrent set value. When it does, it returns to the original state and outputs a signal of "0". That is, the overcurrent relay 18 operates in accordance with the overcurrent, and even when the circuit breaker at its own end is cut off, if the breaking fails and an arc is generated in the circuit breaker, the overcurrent relay 18 is in the operating state due to the overcurrent. Is a relay that returns to the original state when the circuit breaker is surely cut off, and is configured as a circuit break success determination unit that detects whether or not the circuit breaker has been cut off successfully. The overcurrent relay 18 is configured to return to the original state in the earliest time when the relays 16 and 22 are in a normal state as compared with the other relays 16 and 22.

The shutoff command input unit 20 inputs a shutoff command (a signal of "1") from a shutoff command generating device (not shown) which generates a shutoff command when a bus bar accident occurs, and at the same time, the signal line 10
A disconnection failure detection signal (“1” signal) from the disconnection failure detection unit 50 is input via 2, and the “1” signal is input to the AND gate 26, OR in response to the input disconnection command or the disconnection failure detection signal. It outputs to the gate 34. The accident detection relay 22 operates when an accident occurs in the power system, for example, when the voltage of the system drops below a set voltage, and outputs a signal of "1" to the AND gates 28 and 30 during this operation. It is supposed to do.

The AND gate 24 outputs a signal of "1" to the AND gate 26 on the 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 interruption failure detection signal (“1” signal) from the interruption command input unit 20
A signal of "1" is output to the communication unit 32 and to the OR gate 40 on the condition of the logical product of and. This signal is output as a signal for prohibiting reclosing of the circuit breaker at its 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 the condition of the logical product with the operation of 2. When the OR gate 34 outputs the signal “1” from the cutoff command input unit 20,
Alternatively, when the signal “1” is output from the AND gate 28, the signal “1” is output to the breaker trip unit 48. The circuit breaker trip unit 48 is configured as a circuit breaker that trips (breaks) the circuit breaker at its own end when the signal “1” is output from the OR gate 34. The AND gate 30 outputs a signal of “1” to the cutoff failure detection unit 50 by logically operating the differential relay 16, the overcurrent relay 18, and the accident detection relay 22. The AND gate 30 outputs a signal of "1" when all the relays 16, 18, 22 are activated, and outputs a signal of "0" when one of the relays returns to the original state. It is designed to output to. The disconnection failure detection unit 50 is configured to have a function as a timer, and activates the timer when a signal “1” is input from the signal line 104, and the AND gate 30 outputs “a signal” even if a predetermined time has elapsed. When the signal "1" is input, the disconnection failure detection signal is output to the signal line 102 because the disconnection of the circuit breaker at its own end has failed. That is, the AND gate 30 and the disconnection failure detection unit 50
Is a disconnection failure that outputs a disconnection failure detection signal when the overcurrent relay does not return to its original state (when a positive determination output does not occur) even after a certain time has elapsed after the circuit breaker at its own end has been disconnected. It is configured as a detection means.

The reclosing circuit 36 is instructed to cut off the circuit breaker at its own end, and on the condition that the reclosing condition is satisfied based on the information from the other end or the adjacent line. The start command is output to the memory circuit 42 to set the memory circuit 42. After the activation command is stored in the storage circuit 42, if the activation command is not reset even after the set time has elapsed, the circuit breaker at its own end is reclosed by the execution of the reclosing circuit execution unit 44. That is, the reclosing activation unit 3
6, the memory circuit 42, and the reclosing circuit execution unit 44 are configured as reclosing means.

On the other hand, the unsatisfied information input unit 38 is input with information such as a cooperation condition which is a disconnection condition of the other end or the adjacent line, and the reclosing condition is not satisfied, for example, the transmission line of the protection target section is specified. When information indicating that 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 one of the AND gate 26, the communication unit 32, and the failure information input unit 38, and outputs the storage circuit 42. Is configured to reset the stored information (start command) of the. When the activation command of the memory circuit 42 is reset, the activation 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 memory circuit 42 are configured as a reclosing prohibition unit forcibly prohibiting the reclosing of the circuit breaker at its own end. Further, 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 path 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 a reclosing prohibition unit that forcibly prohibits the reclosing of the circuit breaker at the other end.

In the above structure, when a fault 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 fault detection relay 22 are all activated. , AND gates 24, 2
A signal of "1" is output from each of 8 and 30. AN
When the signal "1" is output from the OR gate 34 in response to the signal from the D gate 28, the breaker trip unit 48 cuts off the breaker at its own end. After that, when the overcurrent relay 18 returns to the original state before a certain time has elapsed (before the disconnection failure detection signal is output from the disconnection failure detection unit 50), the circuit breaker at the self-end is reliably disconnected. The output of the AND gate 30 is from "1" to "0"
Flip to. When the reclosing condition is further satisfied, a start command is set in the memory circuit 42 by the start of the reclosing starting unit 36, and the reclosing circuit executing unit 44 recloses the circuit breaker at its own end to form a reclosing circuit. It will be.

On the other hand, even after a certain period of time has passed after the circuit breaker at the self-end has been cut off, the overcurrent relay 18 does not return to its original state, and the AND gate 30 outputs a signal of "1". Is continuously output, the disconnection failure detection unit 50 outputs a signal “1” and the disconnection command input unit 20 outputs a disconnection failure detection signal. When this signal occurs,
A break command is output again to the breaker trip unit 48, and the condition of the AND 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 "1" is output from the OR gate 40, the contents stored in the memory circuit 42 are reset, and the reclosing operation 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 given to the system due to reclosing when the disconnection fails.

In the present embodiment, the disconnection failure detection device 14 is provided with a disconnection failure detection signal generator, or each disconnection failure detection signal generator and the protection relay device 10 are connected via a signal line. The AND gates 24 and 26 are connected to the protection relay device 10 without modification by connecting the AND gates.
By providing only, it is possible to configure a means for locking the reclosed circuit when the disconnection fails.

In the above embodiment, the AND gate 2
Although a signal for generating a signal for locking the re-closed circuit has been described using Nos. 4 and 26, the AND gate 24 is used to determine the logical product of the differential relay 16, the overcurrent relay 18, and the cutoff command input unit 20. , Instead of 26, 3-input AND
A gate can also be used. Further, instead of the 3-input AND gate, a 4-input AND gate may be used to input the output of the accident detection relay 22 to the 4-input AND gate.

Further, in the above 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 the interruption failure at 0 and 12, A
The function of an on-delay timer can be added to the output side of the ND gate 24 or the AND gate 26. Further, in order to cope with the limit operation of the relay, a circuit having a function of 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 both the on-delay timer and the off-delay timer are added. A circuit having the function of can be added.

In the above embodiment, the reclosing of the circuit breaker at the self end and the reclosing of the mating 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 reclosed circuit at the own end can be locked by this signal.

Further, in the above-mentioned embodiment, the protection relay devices 10 and 12 having the communication parts 32 and 46 have been described, but the present invention can be applied to a protection relay device which does not have the communication parts 32 and 46. it can.

[0029]

As described above, according to the present invention,
Since the reclosing of the circuit breaker is forcibly prohibited when the disconnection fails, it is possible to prevent the system from being damaged due to the formation of the reclosed circuit when the disconnection fails.

[Brief description of drawings]

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

[Explanation of symbols]

10, 12 protection relay device 14 Blocking failure detection device 16 differential relay 18 Overcurrent relay 22 Accident detection relay 24, 26, 28, 30 AND gate 32 Communications Department 34 OR gate 36 Recloser activation part 38 Failure information input section 40 OR gate 42 Memory circuit 44 Reclosing circuit execution unit 48 Circuit breaker trip section 50 Blocking failure detection unit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Noro 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Kokubun factory (72) Inventor Kiyotaka Shinohara 1-1, Kokubun-cho, Hitachi-shi, Ibaraki No. 1 Stock company Hitachi Kokubun factory (56) Reference JP-A-6-327137 (JP, A) JP-A-4-168908 (JP, A) JP-A-5-336647 (JP, A) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) H02H 3/00-3/52 H02H ⁷ /00-7/30

Claims (3)

(57) [Claims] 1. A differential relay that operates when an abnormality occurs in the difference between the current of a self-end circuit breaker installed in a protection target section of the power system and the current of a mating end circuit breaker related to the self-end circuit 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 a disconnection is performed for the self-end circuit breaker. Re-closing means for re-closing the self-end circuit breaker when a post-reclosing condition is satisfied, and start-up based on a logical product of the operation of the differential relay, the operation of the overcurrent relay and the operation of the accident detection relay. Of the differential relay and a disconnection failure detecting means for outputting 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 certain time after starting. A reclosing circuit device comprising re-closing prohibiting means for prohibiting re-closing by the re-closing means on the condition of a logical product of an operation, an operation of the overcurrent relay and a generation of the interruption failure detection signal. 2. A differential relay that operates when an abnormality occurs in the difference between the current of a self-end circuit breaker installed in a section to be protected of the power system and the current of a mating end circuit breaker related to the self-end circuit 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 a disconnection is performed for the self-end circuit breaker. Re-closing means for re-closing the self-end circuit breaker when a post-reclosing condition is satisfied, and start-up based on a logical product of the operation of the differential relay, the operation of the overcurrent relay and the operation of the accident detection relay. Of the differential relay and a disconnection failure detecting means for outputting 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 certain time after starting. While prohibiting re-closing by the re-closing means on 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-closing prohibition command is transmitted to the other end using the communication means, Blocking the other end Reclosing circuit device and a re-feeding inhibition means for inhibiting the cycling against reintroduction means for remote end to cycle the vessel. To 3. A logical product of the re-feeding inhibition means conditions, re ON delay timer or OFF delay timer functions and the on-delay timer and formed by adding the off-delay both timer functions according to claim 1 or 2, wherein Closed circuit device.