JPH1146438A - Wide-range reserve protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the trouble speedily and with high sensitiveness, even in the case the trouble removal by a main protective relay can not be done. SOLUTION: In case the break by the main protector is not performed by the inoperativenees of a breaker at system trouble, a processing unit 401 outputs a command to control the current value to be used for a trouble detection means having detected the trouble to a constant multiple to an input part 10 by differential operation, and the input part controls the current value to a constant multiple, and the processing part 401 performs the protective operation with the current value after control. As a result, though the neighboring trouble detection means using the current of a breaker being broken normally does not operate, the neighboring trouble detection means using the current of the operative breaker operates, so this protector can detect the failure of the breaker, and breaks a breaker required in the output part 201 by the neighboring trouble detection means at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay device for protecting a power system, and more particularly to a wide-area retrofit protective device required when an accident cannot be eliminated by a main protective device.

[0002]

2. Description of the Related Art Conventionally, (1) an accident during lock of a main protection relay, and (2) when a main protection relay cannot operate normally.
(3) If the fault cannot be eliminated by the main protection relay, such as when the related equipment (breaker, PD, CT) is defective, a back-up protection device is required. ing.

[0003] Many conventional back-up protection devices employ a distance relay. For example, Electric Joint Research Vol.
According to -12, it is shown that about 90% of the protection after short circuit uses a distance relay, and 99% of the protection against ground fault in a direct grounding system uses a distance relay.

However, as described in the Electric Joint Research Vol. 37, No. 1, No. P-32 to 36, it is necessary to set an accident elimination time late in consideration of time coordination, as a rear protection device using a distance relay. In addition, there is a problem in shortening the fault elimination time and in selecting the fault section, for example, when the protection capability is reduced due to the influence of the shunt error of the system or the load current.

[0005] Specifically, a case where the time to clear an accident is delayed is a system in which a long-distance transmission line and a short-distance transmission line are mixed.
Coordination of the impedance setting values of the distance relays of both transmission lines is difficult, and the operation of the second stage of the distance relay of the long transmission line may be delayed.

In a multi-terminal system, a blind spot that cannot be eliminated by the first-stage relay is generated and a second-stage trip occurs, which may delay the removal of the accident. In addition, due to the principle of the distance relay, a distance measurement error is apt to occur due to a shunt effect, excess / deficiency of zero-phase compensation, installation of a non-power supply end, etc., resulting in underreach and delay of accident removal.

Further, a blinder is provided to prevent operation at a normal load current, and an accident having a large accident point resistance cannot be detected. Therefore, the detection sensitivity cannot be made high.

In the prior art, in order to eliminate delays in operation time, disconnection of routes and complexity of operation, for example, Japanese Patent Laid-Open No. 6-27
Japanese Patent Application Laid-Open No. 4-133614 discloses a back-up protection system disclosed in US Pat. No. 6663, a conventional circuit breaker non-operation countermeasure device disclosed in JP-A-4-133614 as a countermeasure for circuit breaker non-operation, and a device described in JP-A-4-133614 as an improvement measure for circuit breaker failure. The wide-area protection device shown in FIG.

First, as an example of the prior art, a back-up protection system disclosed in Japanese Patent Application Laid-Open No. 6-276663 for eliminating delays in operation time, disconnection of routes, and complexity of operation will be described.

FIG. 34 is a functional block diagram showing a first example of the prior art. FIG. 34 shows a transmission line composed of three electric stations A, B, and C and two lines connecting them. 1
A, 1B Party, 1B Party, 1C Party, and 1C Party are A Electric Station,
The bus lines of B and C substations are shown. Reference numerals 21 and 22 denote transmission lines connecting the A substation and the B substation, and 31 and 32 denote transmission lines connecting the B substation and the C substation.

2A1CB, 2A2CB, 2B1CB, 2
B2CB, 3B1CB, 3B2CB, 3C1CB, 3C
2CB indicates circuit breakers (CB) at both ends of the transmission line. 1B
CB, 1CCB is CB for bus connection of B substation and C substation
Is shown. 2A1, 2A2, 2B1, 2B2, 3B1, 3
B2, 3C1 and 3C2 are distance relay devices (DZ) for detecting an accident in the direction of the transmission line.

DZ is a first stage (DZ1) relay for detecting an accident up to about 80% of the opposite terminal of the transmission line, and 12
Settle to about 0% and detect the opposite bus accident without fail.
It consists of a three-stage (DZ2) relay and a three- or four-stage distance relay of a third-stage (DZ3) or a fourth-stage (DZ4) relay set at 300 to 500% of the own section to detect an accident in the next section. ing. This DZ2 relay can change the operation time limit set according to external conditions.

B-BD1 and C-BD1 identify the direction of the accident on the instep bus, and B-BD2 and C-BD2 identify the direction of the accident on the auxiliary bus, and a bus separation relay (CB) for releasing the bus communication CB. BD). The BD includes a direction element (BDD) for identifying an accident bus direction and a distance relay (BDZ) for detecting an accident near the bus. The BDZ is settled to be smaller than the operating range of the first stage (DZ1) of the distance relay as a back-up protection for transmission lines or transformers connected to the substation.

Reference numeral 4B denotes an apparatus for identifying an accident section in accordance with a predetermined logic based on the operation state and system configuration of the DZ or BD, selecting a terminal to which the result is transferred, and controlling the transfer. 5TA and 5TB are between AB electrical stations, 6TB and 6TC
Is a transmission device that connects between BC electric stations, and 5T and 6T are examples of micro radios that connect the transmission lines.

With the above configuration, the prior art example 1 measures the impedance up to the fault point, changes the cutoff time according to the measured value, and uses a distance relay using a distance relay for coordinating devices in each protection section. Means for identifying a bus accident, means for transmitting an accident identification result to a distance relay having a predetermined terminal, and controlling a preset time limit of the distance relay based on the transmitted signal. Means.

If it is determined that the bus fault has occurred, the operation time limit of the distance relay installed at the opposite terminal of the transmission line and the transformer connected to the bus, and the transmission line and the transformer accident have occurred. If it is determined that the operating time of the distance relay installed at the opposite terminal of the transmission line or the transformer is short-circuited, the operating time of the own-end distance relay is shortened.

Next, as a second example of the prior art, a circuit breaker failure countermeasure device will be described. FIG.
It is a block diagram of the conventional circuit breaker countermeasure device shown in No. 14. In FIG. 35, an electric power system consisting of a double bus of the insteps A and B and a transmission line connected to the insteps A and B, a bus protection device 101 which protects the insteps, and a transmission line 1 in which the transmission line 1 is protected. An electric wire protection device 102, 103 and a circuit breaker failure countermeasure device 104 as a substitute for the failure countermeasure of the circuit breaker CB1 are shown.

The bus protection device 101 includes current transformers CT2 and CT
6, a current is input from CT10, CT12 and CT13, and the presence or absence of an accident in the instep bus is determined by a current differential method. When an accident is detected, a trip command is output to circuit breakers CB1, CB3, CB5, CB6 and CB7.

The transmission line protection device 102 receives the current of the current transformer CT1 and the current of the current transformer CT4 transmitted from the transmission line protection device 103, and determines the presence or absence of an accident in the transmission line 1 by a current differential method. Then, when an accident is detected, a trip command is output to circuit breaker CB1. At this time, the circuit breaker CB2 is similarly cut off by a trip command from the transmission line protection device 103. The transmission line protection devices 102 and 103 include:
Generally, a current differential relay using PCM transmission is used.

The circuit breaker failure countermeasure device 104 inputs the current of the current transformer CT1 and the trip output S102 of the transmission line protection device 102. The current of the current transformer CT1 is input to the overcurrent relay 105, and when it is determined that the overcurrent relay 105 operates, the output S101 is output.
Is output. The logical product of the output S101 and the trip output S102 is obtained, and if there is a signal, the output S103 is output.

The output S103 is input to a timed operation circuit 106 for delaying the output by a predetermined time T101, and the output of the timed operation circuit 106 becomes a trip command for CB3, CB5, CB6 and CB7. Therefore, this circuit breaker failure countermeasure device 10
4 indicates the transmission line protection device 10
After the trip output of (2), even though a predetermined time T101 has elapsed, since the current flows through CT1, it is determined that the breaker CB1 is defective, and all the breakers CB1 connected to the instep bus are determined.
The impact of the failure is only to cut off the transmission line connected to the instep bus, minimizing damage.

A circuit breaker at the time of occurrence of a bus accident, for example, C
For the failure of B1, a measure to cut off the circuit breaker CB2 by a similar device can be considered.
In addition, it is necessary to use a line corresponding to the trip output S102, and it is necessary to transmit a trip command to the opposing circuit breaker of the transmission line. In consideration of the frequency, there is no general device for preventing circuit breaker failure in the event of a bus accident.

As a third example of the prior art, a wide-area protection device disclosed in Japanese Patent Application Laid-Open No. 4-133614 in which the performance of a conventional circuit breaker failure countermeasure is improved will be described. FIG.
It is a block diagram of the wide area protection apparatus shown to 133614. In FIG. 36, the bus protection device 1 converts each terminal current of the instep bus to current transformers CT2, CT6, CT10, CT12 and CT13.
Or to output the sampling signal to the terminal devices T1, T2, T3, T4 and T5 to the optical fiber cable HB.

The output of this optical signal is distributed by the star coupler 2 to the terminal devices T1, T2, T3, T4 and T5 via the optical fiber cables H1, H2, H3, H4 and H5, respectively. The terminal devices T1, T2, T3, T4 and T5 convert the current inputs from the current transformers CT2, CT6, CT10, CT12 and CT13 into digital signals in accordance with the input sampling signals, respectively, and respectively transmit the optical fiber cables H1, H2 and H3. Output to the bus protection device 1 via H3, H4 and H5.

The bus protection device 1 determines the presence or absence of an accident at the instep bus by a current differential protection method using each terminal current input via the optical fiber cable HB. Then, when an accident in the instep bus is detected, a trip command is output to the optical fiber cable HB.

The trip commands S1B, S2B, S3
B, S4B and S5B are terminal devices T1, T2 and T, respectively.
3, T4 and T5, respectively, and breakers CB1, CB respectively.
3, CB5, CB6 and CB7. In order to protect the transmission line 1, the transmission line protection device 3 transmits the current of the current transformer CT 1 and the transmission line protection device 4 to the PCM transmission system 5.
And the current of the current transformer CT4 transmitted by
In order to sample currents of the current transformers CT1 and CT4 at the same time, sampling synchronization control is performed with the transmission line protection device 4.

The sampling signal obtained by the sampling synchronization control is used to convert the current of the current transformer CT1 into a digital signal, and is output to the wide area protection device 6 as the sampling signal S1. The transmission line protection device 3 receives the currents of the current transformers CT1 and CT4 converted into digital signals, determines whether there is an accident in the transmission line 1 by a current differential method, and determines whether there is an accident in the current transformers CT1 and CT4. The digital signal of the current of CT4 is output to wide area protection device 6 as current data S2A and S2B.

Then, when an accident of the transmission line 1 is detected, a trip command S3 is output to the circuit breaker CB1. At this time, the circuit breaker CB2 is similarly cut off by the trip command S4 from the transmission line protection device 4. The wide area protection device 6 includes a terminal device T10, a time difference calculating unit 7, a correcting unit 8, and an operation determining unit 9.

The terminal device T10 inputs the bus terminal currents and the sampling signal which are input to the bus protection device 1, and the breaker C
In order to output trip commands S2B, S3B, S4B and S5B to B3, CB5, CB6 and CB7, respectively, they are connected to the star coupler 2 by an optical fiber cable H10.

The time difference calculating means 7 receives the sampling signal S5 output from the terminal T10 and the sampling signal S1 output from the transmission line protection device 3, calculates a time difference between the signals, and outputs time difference data S6. . The correction means 8 inputs the digital bus converted all-terminal current data S7 and the time difference data S6 output from the terminal device T10.

Then, bus terminal current data is generated by correcting the bus terminal current data by the time indicated by the time difference data S6, and current data S8A of the current transformer CT2 and current data S8B other than the current transformer CT2 are output. By this correction, bus terminal current data sampled at the same time as the sampling time in the transmission line protection devices 3 and 4 can be obtained.

In the operation judging means 9, the current differential relay
10 inputs the current data S2B and the current data S8B,
The presence or absence of an accident in the transmission line 1 and the instep bus is determined. When an accident is detected, a trip signal S9 is output to the time limit operation circuit 11. After inputting the trip signal S9, the time limit operation circuit 11 still outputs the trip signal S9 even after a predetermined time T0 has elapsed.
, The trip signal S10 is output.

On the other hand, after inputting the overcurrent data S8A and adding its absolute value, it is determined whether or not a current is flowing through the circuit breaker CB1. Then, if a current is flowing, a trip signal S11 is output. The AND circuit 13 receives the trip signal S10 and the trip signal S11, and outputs a trip signal S12 when both signals are present. This trip signal S12
Is output to the transmission line protection device 3 to cut off the circuit breaker CB2, and is output to the terminal device T10 to cut off the circuit breakers CB3, CB5, CB6 and CB7.

When the trip signal S12 is input, the transmission line protection device 3 transmits a signal to the transmission line protection device 4 by adding a trip signal to transmission data. This technique is commonly known as a transfer trip. The same wide-area protection device as the wide-area protection device 6 is installed in the opposite bus,
The power transmission line 1 and the bus to which the power transmission line 1 is connected are protected.

As described above, the input means 1 for inputting the current at the opposite end of the transmission line protection device, the input means 2 for inputting the current of terminals other than the transmission line terminal in the bus protection device,
A time difference calculating means for calculating a time difference between sampling timings of the transmission line protection device and the bus protection device; and an input means for correcting an output of the input means based on a result of the time difference calculation means.
And output judging means for inputting the output current of the input means 1 and the output current of the input means 2 and judging the operation by the current differential protection method. The operation determining means is configured to include a means for outputting a trip command to an opposing end of the transmission line and a bus terminal other than the transmission line terminal or one of the circuit breakers when an accident is detected.

As described above, since one transmission line and the bus connected to it are targeted, any fault of the transmission line and the bus can be prevented by the transmission line protection device and the bus protection device due to the failure of the circuit breaker. Even if the accident is not eliminated, a trip command can be output to the circuit breaker at the opposite end of the transmission line and the bus terminal other than the above-mentioned transmission line terminal, and the failure of the circuit breaker is reliably detected to minimize the effect. .

[0037]

As shown in Examples 1 to 3 of the prior art as described above, it is possible to reduce the time required for eliminating accidents.
It is possible to improve the performance individually, such as countermeasures in case of a breaker failure, but when viewed comprehensively, high speed, high sensitivity,
A back-up protection device to eliminate the accident in the minimum section was not considered.

The present invention has been made in order to solve the above-mentioned problems. In view of the duty of a protection relay, a (1) accident while the main protection relay is locked, and (2) a case where the main protection relay cannot operate normally. (3) Related equipment (circuit breaker, PD, C
T) It is an object of the present invention to provide a wide-area retrofit protection device capable of removing an accident at high speed, with high sensitivity, and in a minimum section even if an accident cannot be eliminated by the main protection relay such as a failure.

[0039]

According to a first aspect of the present invention, there is provided a wide-area retrofit protection device which inputs a current of a protected power system and a current value in response to a command from an arithmetic processing unit described later. An input unit having means for controlling to a constant multiple, an arithmetic processing unit having a protection arithmetic unit based on the input electric quantity,
An output unit that outputs a shutoff command to the circuit breaker using the calculation result.

If the interruption by the main protection is not performed due to a circuit breaker failure at the time of a system fault, a command for controlling the current value used for the fault detecting means detected by the arithmetic processing unit to be a constant multiple is input to the input unit. And the input unit controls the current value to be a constant multiple, and the arithmetic processing unit performs a protection operation using the controlled current value. As a result, the adjacent fault detecting means using the processing of the normally interrupted circuit breaker does not operate, but the adjacent fault detecting means using the current of the uninterrupted circuit breaker operates, so that it is possible to detect a breaker failure. At the same time, the necessary circuit breaker can be cut off by the adjacent accident detection means.

According to a second aspect of the present invention, there is provided a wide area retrofit protection device comprising: an input unit having means for inputting a current of a protected power system; and a protection operation means and a protection operation based on the input electric quantity. An arithmetic processing unit having means for controlling the current value to be used to be a constant multiple, and an output unit for outputting a shutoff command to the circuit breaker using the arithmetic result are provided.

If the interruption by the main protection is not performed due to the failure of the circuit breaker at the time of the system accident, the current value used for the accident detection means, which has detected the accident in the arithmetic processing unit, is controlled to be a constant multiple. The protection operation is performed using the current value. As a result, although the adjacent accident detection means using the processing of the normally interrupted circuit breaker does not operate, the adjacent accident detection means using the processing of the circuit breaker that is not interrupted operates, so that it is possible to detect the breaker failure. At the same time, the necessary circuit breaker can be cut off by the adjacent accident detection means.

According to a third aspect of the present invention, in the wide area retrofit protection means according to the first aspect, the input unit includes a terminal, a bus section, a bus connection, and a transformer of the transmission line of the power system to be protected. Means for taking in current, and means for controlling the current value to be a multiple of a constant according to a command from a calculation current unit described later, wherein the calculation processing unit performs a differential calculation using the current of each terminal of the transmission line of the input unit. Transmission line fault detection means, transformer fault detection means by differential operation using the current of the transformer of the input unit, and difference using the current of the transmission line, transformer, bus division, and bus connection of the input unit Means for outputting a command for controlling the current value used for the differential operation of the accident detecting means for detecting an accident to be a constant multiple, on condition that the operation of the accident detecting means is continued for a predetermined time; With.

If the circuit breaker fails to shut off the main protection due to the failure of the circuit breaker, the circuit breaker of the fault detecting means detects the fault on condition that the fault detecting means of the arithmetic processing unit operates for a predetermined time. Control all corresponding input current values. As a result, the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate, but the adjacent fault detecting means using the current of the uninterrupted circuit breaker operates to detect a breaker failure. At the same time, the necessary circuit breaker can be cut off by the adjacent accident detection means.

[0045] In the wide area retrofit protection device according to claim 4 of the present invention, in claim 2, the input portion is each terminal of the transmission line of the protected power system, the bus section, the bus connection, and the current of the transformer. The operation current unit is provided by means of a differential operation using a current of each terminal of the transmission line of the input unit, and a differential operation using a current of a transformer of the input unit. A transformer fault detecting means, a bus fault detecting means by differential operation using respective currents of the transmission line, the transformer, the bus division and the bus communication of the input section, and a condition that the fault detecting means continues to operate for a predetermined time. A means for controlling the current value used for the differential operation of the fault detection means that has detected the fault to be a constant multiple, and a means for outputting a command for controlling the current value to be a constant multiple to an adjacent wide area retrofit protection device, Determine the current value from the wide area rear protection device And means for controlling the current value to a constant multiple in response to a command to control the times.

If the interruption by the main protection is not performed due to the failure of the circuit breaker at the time of the system accident, the differential operation of the accident detection means which has detected the accident is performed under the condition that the operation of the accident detection means of the arithmetic processing unit is operated for a predetermined time. When the current value to be used is controlled to be a constant multiple and the area adjacent to the circuit breaker of the accident detecting means that has detected the accident is protected by another device, the constant multiple control command of the current value is transferred to the other device. . As a result, the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate, but the adjacent fault detecting means using the current of the uninterrupted circuit breaker operates to detect a breaker failure. At the same time, the necessary circuit breaker can be cut off by the adjacent accident detection means.

The wide area retrofit protection device according to claim 5 of the present invention is characterized in that, in claim 1 or claim 3, the input unit comprises a means for inputting a current of the protected power system and an arithmetic processing unit. Means for controlling the current value to 0 in response to the command.

By controlling the current value to 0, the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate, as in [claim 1] or [claim 3]. Since the adjacent fault detecting means using the current of the circuit breaker which is not interrupted operates, the fault of the breaker can be detected, and at the same time, the required faulty breaker can be cut off by the adjacent fault detecting means. Also, there is an advantage that current value control is simple.

In the wide area retrofit protection device according to claim 6 of the present invention, in claim 2 or claim 4, the arithmetic processing unit detects an accident on condition that the accident detection means operates for a predetermined time. Means for controlling the current value used for the differential operation of the accident detection means to 0 and outputting a command to control the current value to 0 to an adjacent wide area retrofit protection device, and a current value from the adjacent wide area retrofit protection device The current value is set to 0 by the 0 control command.
Control means.

By controlling the current value to 0, similar to [claim 2] or [claim 4], the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate. Since the adjacent fault detecting means using the current of the circuit breaker which is not interrupted operates, the fault of the breaker can be detected, and at the same time, the required faulty breaker can be cut off by the adjacent fault detecting means. Also, there is an advantage that current value control is simple.

In the wide area retrofit protection device according to claim 7 of the present invention, the input unit or the central processing unit according to claim 5 or 6 is provided on condition that the accident detection means operates for a predetermined time. A device having means for controlling a current value corresponding to the circuit breaker of the accident detecting means that has detected an accident at 0 and changing the accident detecting sensitivity of each of the accident detecting means to thereby detect a circuit breaker failure. .

By controlling the current value to 0, similar to [claim 5] or [claim 6], the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate. Since the adjacent fault detecting means using the current of the circuit breaker which is not interrupted operates, the fault of the breaker can be detected, and at the same time, the required faulty breaker can be cut off by the adjacent fault detecting means. Further, the sensitivity of each accident detection means has been conventionally determined based on a fixed error, the number of terminals, and the number of lines, and the sensitivity is several hundred A to several thousand A on the primary side of the system. If there is a circuit breaker that has been interrupted and a circuit breaker that has not been interrupted after an accident, the accident current becomes small, so that the accident detection sensitivity of the accident detection means cannot be used as it is as the detection sensitivity for circuit breaker failure. Therefore, while controlling the current value to 0 for the detection of a breaker failure,
By changing the fault detection sensitivity of each fault detection means, even if the conventional fault detection sensitivity is used as it is, a circuit breaker failure can be detected by current value control.

The wide-area retrofit protection device according to claim 8 of the present invention provides the wide-area retrofit protection device according to claim 1 to claim 7, wherein after detecting a failure of the circuit breaker, an extended range including equipment adjacent to the defective circuit breaker. And a means for determining a circuit breaker to be interrupted by performing a differential operation of Then, by performing the differential operation in the expanded range, it is possible to determine a breaker to be cut off when a breaker is defective, and to cut off a necessary breaker.

In the wide area retrofit protection device according to the ninth aspect of the present invention, in the case of performing the differential operation in the expanded range according to the eighth aspect, the fault converted into one breaker of each fault detecting means is performed. This device has means for unifying the detection sensitivity and controlling the current value to 0. Then, by performing the differential operation in the expanded range, it is possible to determine the circuit breaker to be cut off when the breaker is defective, and to unify the fault detection sensitivity of each fault detection means to reduce the current value to zero. By controlling, it is possible to detect a breaker failure with simple current value control.

The wide area retrofit protection device according to [Claim 10] of the present invention includes the following [claims 1] to [9].
The apparatus includes means for acquiring at least the current data of the circuit breaker at the input unit around the bus at the opposite end. By making the current data acquisition range at least the current data of the circuit breaker around the bus at the opposite end, backup of the one wide-area retrofit protection device can be performed by the adjacent wide-area retrofit protection device.

The wide area retrofit protection device according to claim 11 of the present invention comprises: an input unit having means for inputting respective currents of a transmission line, a bus connection, a bus division, and a transformer of a protected power system; Transmission line fault detection means by differential calculation using the current of the circuit breaker at each terminal of the transmission line of the input section; transformer fault detection means by differential calculation using the current of the transformer of the input section; A bus fault detecting means by differential operation using respective currents of a transmission line, a transformer, a bus connection, and a bus section of an input section, a current measuring section of the input section, and a predetermined time operation of the fault detecting section. An arithmetic processing unit having means for determining that the circuit breaker is defective if all current values used for the accident detecting means that has detected an accident are equal to or greater than a predetermined value; and means for outputting a circuit breaker breaking command. And an output unit.

If the interruption by the main protection is not performed due to a failure of the circuit breaker at the time of the system failure, the failure detection means of the failure detection means of the failure detection means detects the failure under the condition that the failure detection means of the operation current section operates for a predetermined time. The current value is compared with a predetermined value, and when the current value is equal to or more than the predetermined value, a circuit breaker failure can be detected.

In the wide area retrofit protection device according to claim 12 of the present invention, in claim 1 to claim 11, a circuit breaker that is cut off when a breaker of each circuit breaker is defective is system equipment information or the like. The device is provided with means for setting a circuit breaker on the basis of the above and setting a breaker required when a breaker failure is detected. Then, after detecting a circuit breaker failure by current value control or determination of the current value being equal to or more than a predetermined value, a required circuit breaker can be cut off by a table setting value.

In the wide area retrofit protection device according to claim 13 of the present invention, in any of claims 1 to 12, when the input section is defective, the central processing current section includes a defective input section. This is an apparatus provided with a means for performing a differential operation expanded to a surrounding range. And if the input part is defective,
The provision of the means for performing the differential operation expanded to the area surrounding the faulty input unit enables the elimination of an accident and the shutoff at the time of faulty circuit breaker even when the input unit is faulty.

The wide area retrofit protection device according to claim 14 of the present invention is characterized in that, in claim 1 to claim 13, after a predetermined time after an accident is detected by the accident detecting means, the device corresponding to the circuit breaker is provided. And a means for outputting a shutoff output from the fault detecting means for detecting a fault to the circuit breaker. The circuit breaker failure can be detected by the current value control, and the necessary circuit breaker can be shut off. In addition, by outputting the shutdown output to the circuit breaker from the accident detection means that has detected the accident, not only the circuit breaker failure but also the main protection device In the event of a malfunction, the back-up protection is also possible.

The wide-area retrofit protection device according to claim 15 of the present invention is characterized in that, in claim 1 to claim 13, the self-device does not have a disconnection means, and detects a failure of a circuit breaker.
This is a device provided with a transfer means to the main protection device adjacent to the defective circuit breaker. By providing the transfer means to the adjacent main protection device, it is possible to shut off the circuit breaker after detecting a circuit breaker failure without providing the device with the interruption means.

The wide area retrofit protection device according to claim 16 of the present invention provides the wide area retrofit protection device according to claim 1 to claim 14, wherein the cutoff output to the circuit breaker is detected, and after the failure of the circuit breaker is detected, the defective circuit breaker is detected. Is a device provided with a transfer means to a main protection device adjacent to the main protection device. Then, after a predetermined time after the detection of the accident by the accident detecting means, a shutoff command is issued to the circuit breaker, and a current break is detected by detecting the current value control or comparing the current value with a predetermined value. , It is possible to shut off a required circuit breaker, and it is also possible to provide protection in case of a failure in shutting down due to a failure of the main protection.

[0063]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) (corresponding to [Claim 1]) An embodiment of a wide area retrofit protection device according to [Claim 1] will be described with reference to FIGS. First, the configuration of each unit will be described with reference to the block configuration diagram of the wide-area retrofit protection device according to the embodiment of the present invention in FIG. An input unit 101 captures the current of the power system from a current transformer (CT), a calculation current unit 401 performs a protection calculation by differential calculation, and an output unit 201 outputs a cutoff command. The input unit 101 performs constant multiple control of the current value as needed.

Next, the processing of each section will be described with reference to the schematic flowcharts of FIGS. FIG. 2 is a schematic flowchart of the input unit 101, which comprises processes A1, A2, and A3. The process of the power system is fetched in process A1, and the presence or absence of a current value control command is determined in process A2. If there is a current value control command, the current value is controlled to a constant multiple in process A3.

FIG. 3 is a schematic flowchart of the arithmetic processing unit 401, which comprises processes C1 and C4. In process C1, a current value is fetched from the input section, and in process C4, a protection operation by differential operation is performed. With the above configuration, as a function, when a circuit breaker is defective during the main protection operation, it is possible to detect the failure of the circuit breaker and perform high-speed protection protection. The operation will be specifically described with reference to FIGS.

FIG. 4 shows changes in the system and each current when an accident occurs in the system C of the electric power system consisting of the simple systems A, B, and C, and the fault cannot be eliminated between A and B due to a breaker failure. Is shown. The current of system A at the time of system
A1 to IAn, the current of system B is IB1 to IBn, the current of system C is IAj, IBk, and the fault current is If. I'A1 ~
I'An, the current of system B is I'B1 to I'Bn, the current of system C is I'Aj, I'Bk, and the fault current is I'f.

When the current value control is not performed when the interruption fails, the differential of the system A is expressed by the following equation (1).
Equation (2) is obtained. Further, in the system C where the accident has occurred, if the current value is controlled to be a constant multiple as shown in the equations (3) and (4) after the interruption failure, the differential in the power system A becomes the equation (5) The differential at B is given by equation (6).

[0068]

(Equation 1)

Here, if n ≠ 1, then dIA is obtained from the equation (5).
≠ 0, so that a breaker failure between the systems AB can be detected. In addition, the operation time is shorter than the general operation time of the distance relay, and high-speed accident removal can be performed even when the circuit breaker is defective.

The operation time will be described with reference to FIG.
FIG. 5 shows the shut-off time of the wide area retrofit protection device when the breaker is defective when the operating time of the differential operation is 30 ms and the operating time of the breaker is 40 ms. As shown in FIG. 5, the operation continuation confirmation time until the current value control is 40 ms,
Assuming that the confirmation time after the current value control is 35 ms, the fault elimination time is 150 ms, which makes it possible to eliminate the fault faster than the fault elimination time of the conventional distance relay of about 200 ms.

As described above, the wide-area back-up protection device performs the protection operation using the differential operation, thereby detecting the high-speed accident equivalent to the main protection, the high-sensitivity accident detection similar to the main protection, and the differential detection. The use of the calculation enables selection of an accident section, and detection of the above-described circuit breaker failure.

As described above, according to the first aspect of the present invention, the current value used for the differential operation for detecting an accident is controlled at the input section, so that the current of the normally-breaked circuit breaker is used. The adjacent fault detection means does not operate, but the adjacent fault detection means that uses the current of the circuit breaker that failed to shut down operates, so it is possible to detect the necessity of a breaker and to use a differential operation. It is possible to detect an accident section at high speed and with high sensitivity compared to a rear protection device using a distance relay. It is possible to improve the performance of the back-up protection when the main protection is inoperative and the circuit breaker is defective.

(Second Embodiment) (Corresponding to [Claim 2]) An embodiment of the wide area retrofit protection device according to [Claim 2] will be described with reference to FIGS. First, the configuration of each unit will be described with reference to the block configuration diagram of the wide area retrofit protection device according to the embodiment of the present invention in FIG. The input unit 101 fetches the current of the power system from the current transformer (CT), performs the protection operation in the operation current unit 401, and outputs the cutoff command in the output unit 201. The calculation current unit 401 performs constant multiple control of the current value as necessary.

Next, the processing of each section will be described with reference to the schematic flowcharts of FIGS. FIG. 7 is a schematic flowchart of the input unit 101, which comprises a process A1. In the process A1, the current of the power system is taken. Arithmetic processing unit 401
Is composed of processes C1, C2, C3 and C4. Processing C
At step 1, a current value is fetched from the input unit, and a protection operation is performed at step C4.

With the above configuration, the same operation as in claim 1 can be obtained, and when a circuit breaker is defective during the main protection operation, the failure of the circuit breaker can be detected and high-speed protection can be performed.
High-speed accident detection equivalent to main protection by performing protection operation using differential operation, high-sensitivity accident detection similar to main protection, and accident section selection by using differential operation Thus, it is possible to detect the above-described circuit breaker failure. Also, there is an advantage that the input unit can be simplified as compared with the first embodiment corresponding to [Claim 1].

According to the second aspect of the present invention, the current value control is performed by the arithmetic unit, so that a faulty circuit breaker can be detected by the adjacent fault detecting means as in the first aspect. It is possible to detect an accident section at higher speed and with higher sensitivity as compared with a back-up protection device using a relay, and it is possible to improve the performance of back-up protection in the event of a main protection failure and a breaker failure. Although it is necessary to transfer the current control command from the arithmetic processing unit to the back-up device, the configuration of the input unit can be simplified.

(Third Embodiment) (Corresponding to [Claim 3]) An embodiment of the wide area retrofit protection device according to [Claim 3] will be described with reference to FIGS. First, the configuration of each unit will be described with reference to the block diagram of the wide area retrofit protection device according to the embodiment of the present invention shown in FIG. In FIG. 9, the protection target of the arithmetic processing unit 401 is the transmission lines 1, 2, 3 and the bus 10, and the protection target of the arithmetic processing unit 402 is the transmission lines 3, 4, 5, 6 and the bus 11.

The current of each of the circuit breakers CB41 to CB52 to be protected among the currents of the transmission line, the transformer, the bus connection, and the bus section is input via the current transformers CT101 to CT112 to the input units 101 to 101.
Entered in 112. The input current data is sent to operation current units 401 and 402 via data transmission / reception units 301 to 312.

Focusing on the calculation current section 401, the processing of the input section and the calculation current section is shown in FIGS. FIG. 10 is a flowchart showing the processing of the input unit, which is common to the input units 101 to 106. FIG. 11 is a flowchart showing a schematic flow of the arithmetic processing unit 401, and FIG. 12 is a schematic non-flowchart showing the contents of the protection arithmetic processing C4 in FIG.

FIG. 10 is composed of processes A1, A2, A3, and A4. A1 takes in the current of the system, and A2 issues a control command for a constant multiple (n times: n = constant) of the current value from the arithmetic processing unit. It is determined whether or not there is, and if there is an n-times control command for the current value, the current I is n-times controlled in A3 to obtain the equation (7). Equation (8). Similarly, for the input units 101 to 106, if there is an n-times control command of the current value from the calculation current unit, the input units 101 to 106 are controlled to be n-times.

(2) I ′ = nI (7) I ′ = I (8)

FIG. 11 is composed of processes C11 to C16 and C41 to C44. In processes C11 and C16, a current value necessary for a differential operation for detecting an accident to be protected is input from the input unit.
In processings C41 to C44, protection calculations for the transmission lines 1 to 3 and the bus 10 are performed.

As shown in the flow chart of FIG. 12, the processing contents of each protection operation are composed of processes d1 to d8, a differential operation is performed at d1, and an operation determination is performed at d2. If the difference current is not equal to or more than the set value, it is determined that there is no accident. If the difference current is equal to or more than the set value, it is determined in d3 that the operation is to be continued for a certain period of time.

If the operation is not continued for a certain period of time at d3, it is determined that the operation is normally interrupted.
At 4, it is determined whether or not there is an n-times current value control command. If there is no control command for n times the current value in d4, the current value is n in d8.
If the control command is output and the control command of the current value n times is already present, it is determined at d5 that the operation is to be continued for a certain time.

If the operation is not continued for a certain period of time at d5, it is determined that the circuit breaker is not defective. If the operation is continued for a certain period of time, it is determined that the circuit breaker is defective.
At d7, a cutoff output is performed. Further, in consideration of the occurrence of a breaker failure, a control command for n times the current value is issued at d8.

The above operation is performed in the same manner in detecting an accident of the transmission lines 1 to 3 and the bus 10. Here, the control target of the current value is the current used for each differential operation. The current values I101 and I102 in the case of the protection operation C41 of the transmission line 1, and the current value I103 in the case of the protection operation C42 of the transmission line 2. And I104, the current values I105 and I106 for the protection operation C43 of the transmission line 3, and the current values I102, I104 and I106 for the protection operation C44 of the bus 10. With the configuration described above, when a circuit breaker is defective during the main protection operation, it is possible to detect the failure of the circuit breaker and perform high-speed protection at a high speed, as in the first aspect.

The specific operation will be described below. If an accident occurs in the transmission line 1 and the CB 41 normally shuts down, but if the CB 42 fails and the interruption fails, the current I10 of the CT 101 is determined by the operation continuation determination of the protection calculation C41 of the transmission line 1.
1 and the current I102 of CT102 is controlled n times,
Assuming the equations (10) and (10), the currents I101 'to I106' used for the protection operation of the operation current unit 401 are the equations (11) to (16).

[0087]

(3) I101 ′ = n · I101 (n is a constant) (9) I102 ′ = n · I102 (n is a constant) (10) I101 ′ = n · I101 (10) (11) I102 '= n · I102 (12) I103' = I103 (13) I104 '= I104 (14) I105' = I105 ............ (15) I106 '= I106 ............ (16)

Here, the currents I101 to I101 of the input units 101 to 106 are
The value of I106 is determined by the following equation (17) due to CB41 interruption and CB42 failure.
Equation (21) is obtained. Therefore, the differential current value is given by the equations (22) to (25).

## EQU00004 ## I101 = 0 .............. (17) I102 = IF '(IF' is the fault current after CB41 is cut off) .. (18) I103 = -I104 ........................ (19) I104 + I106 = -IF '(20) I105 = -I106 (21) Transmission line 1: Id = I101' + I102 '= nIF' ... (22) Transmission line 2: Id = I103 ′ + I104 ′ = 0 (23) Transmission line 3: Id = I105 ′ + I106 ′ = 0 (24) Bus line 4: Id = I102 '+ I104' + I106 '= nIF'-IF' = (n-1) IF '(25)

If the value of n is set to a value other than 1, the bus 4
CB44, CB46
Is shut off. As described above, the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate, but it is possible to shut off the necessary circuit breaker by the adjacent fault detecting means using the current of the circuit breaker which is not interrupted. it can.

When the current value of the input section or the current value of the arithmetic processing section of the transmission line fault detecting means or the transformer fault detecting means is controlled, the current value of the circuit breaker CTk is controlled as the value of n. Assuming that (1 + nk) times, nk is given by (26)
When controlling the current value of the input section of the bus fault detecting means or the current value of the central processing section, the current value control of the circuit breaker CTk is assumed to be (1 + nk) times. By using the equation (27), it is possible to detect a breaker failure without changing the accident detection sensitivity of the transmission line accident detection, the transformer accident detection, and the bus accident detection which are arbitrarily set.

[0091]

(Equation 5)

When unifying the sensitivity of each fault detecting means per circuit breaker and controlling the current value of the transmission line fault detecting means or the transformer fault detecting means, the current value control of the circuit breaker CTk should be (1 + nk ) Times, nk is given by equation (28), and when controlling the current value of the bus fault detecting means, the control of the circuit breaker CTk is made (1 + nk) times and nk is given by equation (29), thereby making one interruption. Unify the transmission line fault detection sensitivity, bus fault detection sensitivity, and transformer fault detection sensitivity per unit, and set the current value to (1
+ Nk) times control, the adjacent fault detection means using the current of the normally interrupted circuit breaker does not operate,
Since the adjacent accident detection means using the current of the circuit breaker which is not interrupted operates, the failure of the circuit breaker can be detected, and at the same time, the necessary accident breaker can be shut off by the adjacent accident detection means.

[0093]

(Equation 6)

In particular, by setting the value of nk in equation (28) in the transmission line fault detecting means and setting k in equation (29) in the bus fault detecting means, the arbitrarily set transmission line fault detecting means can be obtained. Circuit breaker failure can be detected without changing the accident detection sensitivity.

As described above, by performing the protection operation using the differential operation, the high-speed accident detection equivalent to the main protection, the high-sensitivity accident detection similar to the main protection, and the differential operation are used. The accident section can be selected, and the above-described failure of the circuit breaker can be detected.

According to the third aspect of the present invention, there is provided a transmission line fault detecting means, a bus fault detecting means, and a transformer fault detecting means for detecting a fault by using a differential operation. Is controlled to be a constant multiple, so that when a circuit breaker is defective, the adjacent accident detection means can detect the circuit breaker defect. Further, by determining the value to be controlled in consideration of the power supply capacity and the accident detection sensitivity, it is possible to detect an accident and detect an appropriate breaker failure.

(Fourth Embodiment) (Corresponding to [Claim 4]) An embodiment of the wide area retrofit protection device according to [Claim 4] will be described with reference to FIGS. 7, 12, 13, and 14. I do. First, the configuration of each unit will be described using the block configuration diagram of the wide area retrofit protection device of the embodiment shown in FIG. In FIG. 13, the arithmetic processing unit 401
To protect the transmission lines 1, 2, 3 and bus 10, arithmetic processing unit
The protection target 402 is the transmission lines 3, 4, 5, 6 and the bus 11.

The current of each of the circuit breakers CB41 to CB52 to be protected among the currents of the transmission line, the transformer, the bus connection, and the bus section is supplied to the input unit 101 through the current transformers CT101 to CT112.
Entered in 112. The input current data is sent to arithmetic processing sections 401 and 402 via data transmission / reception sections 301 to 312. The current value control commands of the arithmetic processing units 401 and 402 are transmitted and received between adjacent devices by the command transmitting and receiving units 501 and 502.

The processing of the input unit and the arithmetic processing unit will be described, focusing on the arithmetic processing unit 401. The schematic flowchart of the input unit is the same as that of FIG. 7 of the second embodiment corresponding to [Claim 2]. In the input units 101 to 106, in the process A1, the currents I101 to I101 of the system are output from the respective current transformers CT101 to CT106. I106
Take in.

The schematic flowchart of the arithmetic processing unit 401 is shown in FIG.
14, the processes C11 to C16, C21 to C26, C
31 to C36 and C41 to C44. Processing C11-C16
Fetches the current values I'101 to I'106 from the input units 101 to 106, determines whether there is a current control command in processes C21 to C26, and if there is a current control command, outputs the current in processes C31 to C36. The value is controlled n times (n is a constant).

If there is no current value control command, it is left as it is. Then, in processes C41 to C44, the transmission lines 1 to 3 and the bus 10
Is performed. The processing content of each protection operation is the same as the flowchart of FIG. 12 of the embodiment corresponding to [Claim 3].

In the third embodiment corresponding to [Claim 3], by controlling the current at the input unit, the adjacent wide-area back-up protection device naturally controls the current. In this case, it is necessary to intentionally control the current value of the adjacent device. For that purpose, a current control means for an adjacent device is provided. However, this embodiment has an advantage that the configuration of the input unit is simplified as compared to [Claim 3].

With the above-described configuration, when a breaker is defective during the main protection operation as in [claim 2], it is possible to detect the failure of the circuit breaker and perform protection at a high speed at a high speed. In addition, by performing a save operation using differential operation, high-speed accident detection equivalent to main protection, high-sensitivity accident detection similar to main protection, and the use of differential operation make it possible to select an accident section. It is possible, and it is also possible to detect the above-mentioned circuit breaker failure.

According to the fourth aspect of the present invention, there is provided a transmission line fault detecting means, a bus fault detecting means, and a transformer fault detecting means for detecting a fault using differential calculation, and a current processing unit for detecting a fault. By controlling the value to be a constant multiple, a circuit breaker failure can be detected, and the same effect as in claim 3 can be obtained. Further, it is necessary to transfer the current control command from the arithmetic processing unit to the adjacent device, but the configuration of the input unit can be simplified.

(Fifth Embodiment) (corresponding to [Claim 5]) FIG. 10 shows an embodiment of a wide area retrofit protection device according to [Claim 5].
This will be described with reference to FIGS. The block configuration diagram of the wide area retrofit protection device according to the embodiment of the present invention is the same as that of FIG. 9 of the third embodiment corresponding to [Claim 3]. This is the same as FIG. 11 of the third embodiment corresponding to [3].

The difference from the third embodiment corresponding to [claim 3] lies in the input section and the protection operation. FIG. 15 is a flowchart showing the processing of the input section, and FIG. 16 is a flowchart showing the protection operation processing. Shown in

The input unit shown in FIG.
3 and A4, the system current is taken in at A1, and it is judged at A2 whether there is a current value 0 control command from the arithmetic processing unit.
In step 3, the current I is controlled to be 0, and the equation (30) is used. When there is no control command for the current value 0, the equation (31) is used in A4. Input section
Similarly, for 101 to 106, if there is a 0 control command of the current value from the calculation current unit, 0 control is performed, and if there is no control command, the current value is used as it is.

## EQU7 ## I ′ = 0... (30) I ′ = I... (31)

The protection operation process shown in FIG. 16 is composed of d1 to d8, a differential operation is performed at d1, and an operation is determined at d2. If the difference current is not equal to or more than the set value, it is determined that there is no accident. If the difference current is equal to or more than the set value, it is determined in d3 that the operation is to be continued for a certain period of time. If the operation has not been continued for a certain period of time at d3, it is determined that the operation has been normally interrupted. If the operation has been continued for a certain period of time or more, the presence or absence of a current value control command is determined at d4.

If there is no current value 0 control command in d4, a current value 0 control command is output in d8, and if there is already a current value 0 control command, the operation is continued for a fixed time in d5. Make a decision. If the operation cannot be continued for a certain period of time at d5, it is determined that the circuit breaker is not defective. If the operation has been continued for a certain period of time, it is determined that the circuit breaker is defective. . Further, taking into account the occurrence of a breaker failure, a 0 control command for the current value is issued at d8.

The above is similarly performed in the detection of an accident of the transmission lines 1 to 3 and the bus 10. Here, the control target of the current value is the current used for each differential operation. The current values I101 and I102 in the case of the protection operation C41 of the transmission line 1, and the current value I103 in the case of the protection operation C42 of the transmission line 2. And I104, the current values I105 and I106 for the protection operation C43 of the transmission line 3, and the current values I102, I104 and I106 for the protection operation C44 of the bus 10. With the above configuration, similarly to the first to fourth aspects, when a breaker is defective during the main protection operation, it is possible to detect the failure of the circuit breaker and perform high-speed protection protection.

The specific operation will be described below. If an accident occurs in the transmission line 1 and the CB 41 normally shuts down, but if the CB 42 fails and the interruption fails, the current I10 of the CT 101 is determined by the operation continuation determination of the protection calculation C41 of the transmission line 1.
1 and the current I102 of CT102 are controlled to be 0,
Assuming the expression (33), the currents I101 'to I106' used for the protection operation of the operation current unit 401 are the expressions (34) to (39).

[0112]

(Equation 8) I101 ′ = 0... (32) I102 ′ = 0... (33) I101 ′ = 0... (34) I102 '= 0 (35) I103' = I103 ... (36) I104 '= I104 ... (37) I105' = I105 ... … (38) I106 ′ = I106 …………… (39)

Here, the currents I103 to I103 of the input units 103 to 106 are
The value of I106 depends on the equation (40) due to CB41 interruption and CB42 failure.
Equation (42) is obtained. Therefore, the differential operation value is represented by Expressions (43) to (46). If the fault current IF 'is equal to or higher than the fault detection sensitivity, a fault is detected by the differential operation (47) of the bus 4, and CB44, C
B46 is shut off.

[0114]

(10) I103 = -I104 (40) I104 = + I106 = -IF '(IF' is the fault current after the CB41 is cut off) (41) I105 = -I106 ... (42) Transmission line 1: 1d = I101 '+ I102' = 0 ... (43) Transmission line 2: 1d = I103 '+ I104' = 0 ... 44 Electric wire 3: 1d = I105 '+ I106' = 0 (45) Bus 4: 1d = I102 '+ I104' = + I106 '=-IF' (46)

As described above, the adjacent accident detection means using the current of the normally interrupted circuit breaker does not operate, but the adjacent accident detection means using the current of the circuit breaker which is not interrupted operates, so that the circuit breaker failure occurs. Can be detected, and at the same time, the necessary circuit breaker can be shut off by the adjacent accident detection means.

According to the fifth aspect of the present invention, there is provided a transmission line fault detecting means, a bus fault detecting means, and a transformer fault detecting means for detecting a fault by using a differential operation, and for detecting a current value at an input section. Is controlled to 0, when a breaker is defective, the adjacent accident detection means can detect the defective breaker.

(Sixth Embodiment) (Corresponding to [Claim 6]) FIG. 12 shows an embodiment of a wide area retrofit protection device according to [Claim 6].
This will be described with reference to FIG. The block configuration diagram of the wide area retrofit protection device of the present embodiment is the same as that of FIG. 13 of the fourth embodiment corresponding to [Claim 4], and the schematic flowchart of the input unit is also [Claim 4]. Is the same as FIG. 7 of the fourth embodiment corresponding to FIG.

The difference from the fourth embodiment corresponding to [Claim 4] is the arithmetic processing unit, and a schematic flowchart of the arithmetic processing unit 401 is shown in FIG. FIG. 17 shows processes C11 to C16,
C21 to C26, C31 to C36, and C41 to C44, and current values I'101 from the input units 101 to 106 in processes C11 to C16.
To I'106, and the presence or absence of a current control command is determined in steps C21 to C26.
The current value is controlled to 0 in 31 to C36.

If there is no current value control command, it is left as it is. Then, in processes C41 to C44, the transmission lines 1 to 3 and the bus 10
Is performed. The processing content of each protection operation is the same as the flowchart of FIG. 16 of the embodiment corresponding to [Claim 5].

In the fourth embodiment corresponding to [Claim 4], by controlling the current at the input unit, the adjacent wide-area back-up protection device naturally controls the current. In this case, it is necessary to intentionally control the current value of the adjacent device. For that purpose, a current control means for an adjacent device is provided. However, this embodiment has an advantage that the configuration of the input unit is simplified as compared to [Claim 4].

According to the above configuration, when a breaker is defective during the main protection operation, it is possible to detect the failure of the circuit breaker and perform the protection at a high speed at a high speed in the same manner as in [Claim 4]. In addition, by performing the protection operation using differential operation, high-speed accident detection equivalent to main protection, high-sensitivity accident detection similar to main protection, and the use of differential operation enable selection of an accident section. It is also possible to detect the above-mentioned circuit breaker failure.

According to the invention of claim 6, there is provided a transmission line fault detection means, a bus fault detection means, and a transformer fault detection means, and performs fault detection using differential calculation. By controlling the value to 0, when a circuit breaker is defective, it is possible to detect the circuit breaker failure by the adjacent accident detection means. Also, there is an advantage that current value control is simple.

(Seventh Embodiment) (Corresponding to [Claim 7]) FIG. 13 shows an embodiment of a wide area retrofit protection device according to [Claim 7].
This will be described using 18. The block configuration diagram of the wide area retrofit protection device of the present embodiment is the same as [Claim 5] or [Claim 6], and the schematic flowchart of the input unit and the arithmetic processing unit is [Claim 5] or [Claim 5]. Claim 6].

The difference from [Claim 5] or [Claim 6] is the protection operation processing, and FIG. 18 is a flowchart showing the protection operation processing. FIG. 18 is composed of processes d1 to d9, a differential operation is performed at d1, and the presence or absence of a breaker failure detection is determined at d2. When a breaker failure is detected, the accident detection sensitivity is changed after a certain period of time.

If no circuit breaker failure is detected, d5
At the same sensitivity. Next, an operation is determined in d6. If the difference current is not equal to or higher than the accident detection sensitivity, it is determined that there is no accident. If the difference current is equal to or higher than the accident detection sensitivity, it is determined in d7 that operation is to be continued for a certain period of time. If the operation has not been continued for a certain period of time, it is determined that the circuit has been normally shut off. If the operation has been continued for a certain period of time or more, a failure of the circuit breaker is determined at d8, and a command to control the current value to 0 is output at d9.

When the accident detection sensitivity is changed in the process d4, in particular, in the case of the accident detection sensitivity of the transmission line accident detection means,
Expression (47), and in the case of the accident detection sensitivity of the bus accident detection means, expression (48) enables highly sensitive accident detection.

[0127]

[Equation 10]

As described above, the adjacent fault detecting means using the current of the normally interrupted circuit breaker does not operate, but the adjacent fault detecting means using the current of the uninterrupted circuit breaker operates to detect a breaker failure. The required circuit breaker can be cut off by the adjacent fault detection means at the same time.Especially, the transmission line fault detection sensitivity should be as shown in equation (47), and the bus fault detection sensitivity should be as shown in equation (48). Accordingly, it is possible to appropriately set the sensitivity in consideration of the fault current after the cutoff, and to perform appropriate cutoff by the adjacent fault detection means.

According to the invention of claim 7, by changing the fault detection sensitivity in addition to the means for controlling the current value, it is possible to detect faults appropriately.

(Eighth Embodiment) (corresponding to [Claim 8]) FIG. 13 shows an embodiment of the wide area retrofit protection device according to [Claim 8].
This will be described with reference to FIGS. FIG. 20 shows a case where an accident occurs in the transmission line 3 in the power system including the transmission lines 1 to 5 and the buses 10 and 12, the circuit breaker CB43 is normally shut off, and the circuit breaker CB44 is defective.

FIG. 19 is a block diagram of a wide area retrofit protection device according to an embodiment of the present invention, which comprises input units 101 to 110, transmission units 301 to 304, an operation current unit 401, and an output unit 201. Also, 1 to 4 are transmission lines, 10 and 11 are busbars, CB41 to
CB45 indicates a circuit breaker, and CT101 to CT110 indicate current transformers.

The operation current section 401 performs a differential operation using each input current to determine the operation. If the operation is continued, the circuit breaker is determined to be defective, and the differential expanded to the range surrounding the defective circuit breaker is determined. Perform the operation. The faulty breaker is shut off by the operation judgment of the enlarged differential operation. The specifics of the expanded differential operation will be described with reference to FIG.

Transmission lines 1 to 5, buses 10, 11 and circuit breaker CB
An accident occurred in the transmission line 3 of the power system composed of 41 to CB46, and CB43 performed a normal cut-off.
If the cutoff fails, differential calculation is performed in the range W surrounding the CB44 where the cutoff failed. By performing the enlarged differential, it is possible to improve the reliability of the interruption determination when the circuit breaker is defective.

According to the invention of claim 8, after the failure of the circuit breaker is detected, the differential operation expanded to the range adjacent to the defective circuit breaker is performed to determine the circuit breaker to be disconnected when the circuit breaker is defective. be able to. In addition, the reliability of the circuit breaker failure detection can be improved by performing the enlarged differential.

(Ninth Embodiment) (Corresponding to [Claim 9]) The embodiment corresponding to [Claim 9] has a configuration in which a plurality of fault detecting means are used when performing differential operation in an expanded range. The current value of the transmission line fault detection means and the transformer fault detection means is n
In performing the double control, n is set as in equation (49).

[0136]

[Equation 11] By setting the value of n as in equation (49), the circuit breaker failure detection sensitivity can be made the same as the bus accident detection sensitivity to detect a circuit breaker failure.

According to the ninth aspect of the present invention, after the failure of the circuit breaker is detected, the differential operation expanded to the range adjacent to the defective circuit breaker is performed to determine the circuit breaker to be disconnected when the circuit breaker is defective. be able to. Further, by unifying the sensitivity of the accident detecting means and controlling the current value to 0, a circuit breaker failure can be detected by simple current value control.

(Tenth Embodiment) ([Claim 10]
An embodiment of the wide area retrofit protection device according to claim 10 will be described with reference to FIG. FIG. 21 is a block diagram showing the configuration of a wide area retrofit protection device according to this embodiment.
Output units 201 to 213, transmission units 301 to 312, and arithmetic processing unit 40
Consists of 1 to 405.

21 are transmission lines, 10 to 14 are buses, 20 in FIG.
Is a transformer, CB41 to CB53 are circuit breakers, CT101 to CT11
3 shows a current transformer. In this case, each of the arithmetic processing units 401 to 405
Are obtained up to around the bus at the opposite end.

By setting the current acquisition range in the differential operation at least around the bus at the opposite end, it is possible to detect a breaker failure when an accident occurs in a transmission line, a transformer, or a bus. Measures can be taken in time.

According to the tenth aspect of the present invention, the current data acquisition range is at least the current data of the circuit breaker around the bus at the opposite end, so that the backup in the event of a failure of the one wide area retrofit protection device can be performed in the adjacent area. This can be done by a wide area retrofit protection device.

(Eleventh Embodiment) ([Claim 11]
An embodiment of the wide area retrofit protection device according to claim 11 will be described with reference to FIGS. FIG. 22 is a schematic flowchart of the arithmetic processing unit of the wide area retrofit protection device of the present embodiment, and FIG. 23 is a schematic flowchart showing the protection arithmetic processing.

FIG. 22 shows processes C11 to C16, C41 to C44, and C51.
56C56, C61〜C66, and in steps 11 必要 C16, a differential operation for detecting an accident to be protected from the input unit and a current value necessary for determining an overcurrent relay for detecting a breaker failure are fetched. In processings C41 to C44, protection calculations for the transmission lines 1 to 3 and the bus 10 are performed. In steps C51 to C56, an amplitude value calculation required for overcurrent determination is performed, and in steps C61 to C66, an overcurrent relay determination is performed.

According to the judgment of the overcurrent relay, if the disconnection fails at the time of an accident, the interruption failure can be detected, and the fault section is detected by each protection operation, so that the faulty circuit breaker can be detected.

The protection operation processing comprises the processing d1 to d6 of FIG. 23, a differential operation is performed at d1, and an operation determination is performed at d2. If the difference current is not equal to or more than the set value, it is determined that there is no accident. If the difference current is equal to or more than the set value, it is determined in d3 that the operation is to be continued for a certain period of time. If the operation is not continued for a certain period of time at d3, it is determined that the operation is normally interrupted. If the operation is continued for a certain period of time or more, it is determined that the operation of the overcurrent relay is continued at d4.

If the overcurrent relay is not operating, it is determined that there is no circuit breaker failure. If the overcurrent relay is operating, a circuit breaker failure is detected by d5, and a disconnection command is output by d6. As described above, the backup and circuit breaker failure when the main protection is not operated can be detected at high speed and with high sensitivity to eliminate the accident.

According to the eleventh aspect of the present invention, the transmission line fault detecting means, the bus fault detecting means, and the transformer fault detecting means are provided, and the fault is detected by using the differential operation, whereby high speed and high speed are realized. Sensitive accident detection is possible, and by providing the determination means that the current value is equal to or higher than a predetermined value,
Circuit breaker failure can also be detected.

(Twelfth Embodiment) ([Claim 12]
An embodiment of the wide area retrofit protection device according to claim 12 will be described with reference to FIGS. FIG. 24 is a schematic flowchart of an arithmetic processing unit of the wide area retrofit protection device according to the present embodiment, and FIG. 25 is a schematic flowchart showing protection arithmetic processing.
26 is a schematic flowchart showing circuit breaker failure detection.

FIG. 24 shows processes C11 to C16, C41 to C44, and C71.
To C76, a differential operation for detecting an accident to be protected and an electric current value necessary for detecting a breaker failure are input from the input unit in processes C11 to C16. Processing C41 to C44
Performs protection calculation for the transmission lines 1 to 3 and the bus 10. or,
Circuit breaker failure detection processing is performed in processing C71 to C76.

The protection operation is composed of processes d1 to d3 shown in FIG. 25, a differential operation is performed at d1, and an operation is determined at d2. If the difference current is not equal to or greater than the set value, it is determined that there is no accident. If the difference current is equal to or greater than the set value, it is determined that an accident has occurred and a cutoff command is output.

The circuit breaker failure detection is performed by processing e1 to e shown in FIG.
5, an amplitude value calculation is performed at e1, and an overcurrent relay determination is performed at e2. If the overcurrent relay continues to operate for a certain period of time or more, a breaker failure is detected at e4, and the breaker is cut off based on the table settings. By setting in advance a circuit breaker to be cut off when a circuit breaker failure is detected based on the system configuration, a necessary circuit breaker can be appropriately cut off.

According to the twelfth aspect of the invention, by setting the circuit breakers to be cut off in the table, there is no need for a means for determining the cut-off range after detecting a breaker failure.

(Thirteenth Embodiment) ([Claim 13]
An embodiment of the wide area retrofit protection device according to claim 13 will be described with reference to FIG. FIG. 27 is a schematic flowchart of the arithmetic processing unit of the wide area retrofit protection device of the present embodiment.

FIG. 27 shows processes C11 to C16, C41 to C47 and C81.
To C83, a current value is fetched from the input unit in processes C11 to C16, and the presence or absence of a defect in the input unit is determined in processes C81 to C83. If there is a defect in the input unit, process C45
The differential operation of the enlarged range is performed in steps C41 to C47, and if there is no defect in the input unit, the transmission lines 1 to 3 are performed in steps C41 to C44.
And the protection operation of the bus 10 is performed.

A specific example of the expanded differential operation will be described with reference to FIG. Transmission lines 1 to 5, buses 10, 11 and circuit breakers CB41 to CB
If an accident occurs in the transmission line 3 of the power system composed of 46 and the input unit installed in the CB 44 is defective,
The differential operation is performed in the range W surrounding the defective circuit breaker CB44. In short, when the input unit is defective, by performing the differential operation in the expanded range, even if the input unit is defective, it is possible to take measures against accidents and circuit breaker defects.

According to the thirteenth aspect of the present invention, when the input section is defective, the differential operation expanded to the area surrounding the defective input section is performed, thereby eliminating and shutting down the accident even when the input section is defective. Device failure detection becomes possible.

(Fourteenth Embodiment) ([Claim 14]
An embodiment of the wide area retrofit protection device according to claim 14 will be described with reference to FIGS. FIG. 29 is a block diagram of the wide area retrofit protection device of the present embodiment, and FIG. 30 is a schematic flowchart of the arithmetic processing unit.

The post-processing speed-up device shown in FIG.
, 110, output units 201 to 205, transmission units 301 to 304, and an arithmetic processing unit 401. 1-4 are transmission lines, 10 and 11 are buses, CB41 to CB45 are circuit breakers, and CT101 to CT110 are current transformers. Is shown.

The processing of the arithmetic processing unit 401 comprises processing C11 to C16 and C41 to C44 shown in the flowchart of FIG. The current value is fetched at C11 to C16, and the protection operation is performed at C41 to C44. In the protection operation, a differential operation is performed in d11, and after the operation is determined in d21, when it is confirmed that the operation is continued for a certain time in d31, a current value control command is output, and
Outputs cutoff output. This makes it possible to eliminate the accident at high speed even when the main protection is not operating.

According to the fourteenth aspect of the present invention, by outputting a current value control command and a cutoff command to the circuit breaker at the same time without waiting for the detection of a circuit breaker failure, the main protection is disabled. Also, high-speed back-up protection becomes possible.

(Fifteenth Embodiment) ([Claim 15]
An embodiment of the wide area retrofit protection device according to claim 15 will be described with reference to FIGS. FIG. 31 is a block diagram of the wide area retrofit protection device of the present embodiment, and FIG. 32 is a schematic flowchart of the arithmetic processing unit.

The post-processing speed-up device shown in FIG.
, 110, transmission units 301-304, and an arithmetic processing unit 401, 1-4 are transmission lines, 10 and 11 are busbars, CB41-CB45 are circuit breakers, CT101-CT110 are current transformers 601-604 are transmission lines. Main protection device 610 indicates a bus protection device.

The processing of the arithmetic processing unit 401 is composed of processing C11 to C16 and C41 to C44 shown in the flowchart of FIG. The current value is fetched at C11 to C16, and the protection operation is performed at C41 to C44. In the protection arithmetic processing, when a circuit breaker failure is detected, the data is transferred to the adjacent main protection. As a result, it is possible to perform the interruption when the circuit breaker is defective, without having the interruption output means in the own apparatus.

According to the invention of claim 15, the structure can be simplified because the own device does not need to have the blocking device by the transfer blocking device to the adjacent main protection device.

(Sixteenth Embodiment) ([Claim 16]
(Response) An embodiment of the wide area retrofit protection device according to claim 16 will be described with reference to FIG. FIG. 33 is a schematic flowchart of the arithmetic processing unit according to the embodiment of the present invention. The processing of the arithmetic processing unit 401 includes processing C11 to C16 shown in the flowchart of FIG.
It is composed of C41 to C44. The current value is fetched at C11 to C16, and the protection operation is performed at C41 to C44.

In the protection calculation process, after a predetermined time after the detection of an accident, a break command is issued to the circuit breaker, and a breaker failure is detected by controlling the current value or comparing the current value with a predetermined value. The provision of the transfer means to the protection device makes it possible to shut off the necessary circuit breaker, and also to provide protection for a failure when the main protection is disabled.

According to the invention of [Claim 16], a cutoff command is issued after a predetermined time when an accident is detected, and a transfer means to an adjacent main protection device is provided, so that a necessary breaker can be cut off. . It is also possible to provide protection in the event of interruption failure due to inactivity of the main protection.

[0168]

As described above, according to the present invention, even if the accident cannot be eliminated by the main protection relay,
Accident elimination can be performed at high speed, high sensitivity and in the minimum section.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart of an input unit according to the first embodiment of the present invention.

FIG. 3 is a flowchart of an arithmetic processing unit according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of circuit breaker failure detection according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of an accident removal time according to the first embodiment of the present invention.

FIG. 6 is a functional block diagram showing a second embodiment of the present invention.

FIG. 7 is a flowchart of an input unit according to the second embodiment of the present invention.

FIG. 8 is a flowchart of an arithmetic processing unit according to the second embodiment of the present invention.

FIG. 9 is a functional block diagram showing a third embodiment of the present invention.

FIG. 10 is a flowchart of an input unit according to the third embodiment of the present invention.

FIG. 11 is a flowchart of an arithmetic processing unit according to the third embodiment of the present invention.

FIG. 12 is a flowchart of a protection operation according to the third embodiment of the present invention.

FIG. 13 is a functional block diagram showing a fourth embodiment of the present invention.

FIG. 14 is a flowchart of the operation processing unit according to the fourth embodiment of the present invention.

FIG. 15 is a flowchart of an input unit according to the fifth embodiment of the present invention.

FIG. 16 is a flowchart of a protection operation according to the fifth embodiment of the present invention.

FIG. 17 is a flowchart of the operation processing unit according to the sixth embodiment of the present invention.

FIG. 18 is a flowchart of a protection operation according to the seventh embodiment of the present invention.

FIG. 19 is a functional block diagram showing an eighth embodiment of the present invention.

FIG. 20 is an explanatory diagram of an enlarged differential according to an eighth embodiment of the present invention.

FIG. 21 is a functional block diagram showing a tenth embodiment of the present invention.

FIG. 22 is a flowchart of the operation processing unit according to the eleventh embodiment of the present invention.

FIG. 23 is a flowchart of a protection operation according to the eleventh embodiment of the present invention.

FIG. 24 is a flowchart of the operation processing unit according to the twelfth embodiment of the present invention.

FIG. 25 is a flowchart of a protection operation according to the twelfth embodiment of the present invention.

FIG. 26 is a flowchart of circuit breaker failure detection according to the twelfth embodiment of the present invention.

FIG. 27 is a flowchart of the operation processing unit according to the thirteenth embodiment of the present invention.

FIG. 28 is an explanatory diagram of an enlarged differential according to a thirteenth embodiment of the present invention.

FIG. 29 is a functional block diagram illustrating a fourteenth embodiment of the present invention.

FIG. 30 is a flowchart of the operation processing unit according to the fourteenth embodiment of the present invention.

FIG. 31 is a functional block diagram showing a fifteenth embodiment of the present invention.

FIG. 32 is a flowchart of the operation processing unit according to the fifteenth embodiment of the present invention.

FIG. 33 is a flowchart of the operation processing unit according to the sixteenth embodiment of the present invention.

FIG. 34 is a configuration diagram illustrating a back-up protection method according to the related art (1).

FIG. 35 is a configuration diagram of a circuit breaker failure countermeasure device of the related art (2).

FIG. 36 is a configuration diagram of a wide-area protection device of the related art (3).

[Explanation of symbols]

 101-112 Input unit 201-212 Output unit 301-312 Data transmission / reception unit 401, 402 Operation processing unit A, B, C Power system

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideyuki Takaha 1 Toshiba-cho, Fuchu-shi, Tokyo, Japan Inside the Toshiba Fuchu Plant Co., Ltd. (72) Inventor Makoto Sato 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office

Claims (16)

[Claims] 1. An input unit comprising: means for inputting a current of a protected power system; and means for controlling a current value to be a constant multiple according to a command from an arithmetic processing unit described later; A wide-area retrofit protection device, comprising: an arithmetic processing unit having protection arithmetic means; and an output unit for outputting a shutoff command to a circuit breaker using the arithmetic result. 2. An input unit comprising means for inputting a current of a protected power system, a protection operation means based on the input electric quantity, and a means for controlling a current value used for the protection operation to a constant multiple. A wide-area retrofit protection device, comprising: a calculated current unit; and an output unit that outputs a shutoff command to the circuit breaker using the calculation result. 3. The wide area retrofit protection device according to claim 1, wherein the input unit takes in the current of each terminal of the transmission line of the protected power system, the bus division, the bus connection, and the transformer; Means for controlling the current value to be a multiple of a constant in accordance with a command from the control unit, wherein the arithmetic processing unit includes a transmission line accident detection unit by differential operation using the current of each terminal of the transmission line of the input unit; A transformer fault detecting means based on differential calculation using current of the transformer, a bus fault detecting means based on differential calculation using currents of the transmission line, the transformer, the bus section, and the bus connection of the input unit; Means for outputting a command for controlling the current value used for the differential operation of the fault detecting means to be a constant multiple on condition that the detecting means continues to operate for a predetermined period of time. apparatus. 4. The wide area retrofit protection device according to claim 2, wherein the input unit includes means for taking in each terminal of the transmission line of the protected power system, the bus section, the bus connection, and the current of the transformer.
The calculation current unit is a transmission line fault detection unit by differential calculation using current of each terminal of the transmission line of the input unit, and a transformer fault detection unit by differential calculation using current of the transformer of the input unit. A bus fault detecting means by differential operation using respective currents of the transmission line, the transformer, the bus section, and the bus connection of the input unit; and a fault detecting means for detecting a fault on condition that the fault detecting means continues to operate for a predetermined time. Means for controlling the current value used for the differential operation of the means to be a constant multiple, means for outputting a command for controlling the current value to be a constant multiple to the adjacent wide area retrofit protection device, and means for outputting the current from the adjacent wide area retrofit protection device Means for controlling the current value to be multiplied by a constant upon receiving a command to control the value to be a multiplied by a constant. 5. The wide-area retrofit protection device according to claim 1, wherein the input unit controls the current value to 0 in response to a command from a means for inputting a current of the protected power system and an arithmetic processing unit. Means for protecting a wide area retrofit. 6. The wide-area retrofit protection device according to claim 2, wherein the arithmetic processing unit uses a current value used for a differential operation of the accident detection unit that has detected the accident, on condition that the accident detection unit operates for a predetermined time. Means to output a command to control the current value to 0 to an adjacent wide area protection device, and to control the current value to 0 according to a current value 0 control command from the adjacent wide area protection device. Means for protecting a wide area retrofit. 7. The wide area retrofit protection device according to claim 5, wherein the input unit or the arithmetic processing unit controls a current value used for differential operation of the accident detecting means for detecting the accident to zero. A wide area retrofit protection device, wherein the accident detection sensitivity of each accident detection means is changed. 8. The wide-area retrofit protection device according to claim 1, wherein after the failure of the circuit breaker is detected, the wide area differential operation including the equipment adjacent to the defective circuit breaker is performed to perform the differential operation. A wide area retrofit protection device for determining a circuit breaker. 9. The wide-area back-up protection device according to claim 8, wherein, when performing a differential operation in an expanded range, the fault detection sensitivity converted per circuit breaker of each fault detection means is unified, and the current value is reduced. A wide-area back-up protection device characterized by being controlled to zero. 10. The wide area retrofit protection device according to claim 1, wherein the current data acquisition range at the input unit is at least the current data of the circuit breaker around the bus at the opposing end. Rear protection device. 11. The transmission line and bus connection of the protected power system,
An input unit having means for inputting each current of the bus section and the transformer, an accident detection means by differential operation using current of a circuit breaker at each terminal of the transmission line of the input unit, and a transformer of the input unit Transmission line transformer fault detection means by differential calculation using current of the transformer, and bus fault detection means by differential calculation using each current of the transmission line, transformer, bus connection, and bus section of the input unit; Under the condition that the current measuring means of the input unit and the fault detecting means operate for a predetermined time, if all the current values used for the fault detecting means that detected the fault are equal to or more than a predetermined value, it is determined that the breaker is defective. A wide area retrofit protection device comprising: an arithmetic processing unit having means; and an output unit having means for outputting a break command of a circuit breaker. 12. The wide area retrofit protection device according to claim 1, wherein a circuit breaker to be cut off when a circuit breaker fails is set on a table, and when a circuit breaker failure is detected, the circuit breaker set on the table is shut off. Wide-area retrofit protection device characterized by the following. 13. The wide area retrofit protection device according to claim 1, wherein when the input unit is defective, the differential operation expanded to a range surrounding the defective input unit is performed. Protective equipment. 14. The wide-area retrofit protection device according to claim 1, wherein a current value of a circuit breaker of the fault detecting means is controlled to be n times or zero after a predetermined time after the fault is detected by the fault detecting means. A wide area retrofit protection device that outputs a shutoff output from the accident detecting means that has detected an accident to the circuit breaker without waiting for the detection of a circuit breaker failure. 15. The wide-area retrofit protection device according to claim 1, wherein the main device does not have a disconnecting means for the circuit breaker, and detects a failure of the circuit breaker, and detects the failure of the circuit breaker, and the main protection device adjacent to the defective circuit breaker. A wide-area retrofit protection device, comprising a transfer means to a vehicle. 16. The wide area retrofit protection device according to claim 1, further comprising: a shutoff output unit to the circuit breaker, and a transfer unit to a main protection device adjacent to the defective circuit breaker after detecting the failure of the circuit breaker. Wide area retrofit protection device.