JP2001045645A - Wide-area protective system and method for electric power system and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wide-area protective system, having a main protecting function and a total protecting function over an electric power system over a wide area. SOLUTION: Each terminal device (RTE) 101, fetches a current of each part of an electric power system 10 from current transformers(CT) 14-1 to 14-4, 15-1 to 18-1, based on sampling timing distributed from a time synchronous network (STE) 201 also fetching voltage of each bus bar 11A to 11E from current transformers (PT) 21 to 25, transmits the fetched information to a central processing unit 402 via a wide-area data transmitting network. A central processing unit (CTE) 402 performs protective calculation through differential calculation, by using information of the current transformer in an arithmetic objective section, to decide on an accident. In accordance with a decision result, breaker control information is transmitted to related each terminal device 101, it performs a prescribed processing based on the received breaker control information, and controls and outputs to a breaker (CB), as necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a protective relay for protecting a power system over a wide area.

[0002]

2. Description of the Related Art As a power system protection system indispensable for a stable supply of power, a system utilizing recent microprocessor technology and information communication technology has become mainstream. For example, for transmission line protection relays, the application of high-performance digital current differential relays combined with digital communication lines is dominant. In the current differential method, the current value of all terminals of the transmission line divided by the circuit breaker is constantly measured, and it is exchanged between terminals using microwaves or optical fiber communication lines.
This is to determine an accident by differential operation.

In such a system, it is necessary to simultaneously sample currents or voltages at all terminals at an instantaneous value level. In the current differential relay, in order to synchronize the sampling timing of the current value across all terminals (sampling synchronization), a synchronization control signal of the sampling timing is exchanged between the terminals together with the current value data through a dedicated communication line.

On the other hand, as a back-up protection relay for backing up when the main protection device is not operating, a distance relay that detects and eliminates an accident using only information on its own is often used. However, as described in the Electric Cooperative Research Society, Vol. 37, No. 1, P-32 to 36, it is necessary to set the accident elimination time later in consideration of time coordination, In addition, when the protection capability is reduced due to the influence of the system shunt error or the load current, there is a problem in shortening the accident elimination time and selecting the accident section.

[0005] More specifically, as a case where the time for removing an accident is delayed, in a system in which a long-distance transmission line and a short-distance transmission line coexist, a second-stage backup protection for the purpose of detecting an opposite bus accident of a long-distance transmission line. The relay may have a set value to detect the short-distance line on the opposite bus accident, and it is difficult to cooperate with the short-distance line back-up protection relay. Comes out. For this reason, in recent years, for the purpose of eliminating delays in operation time, disconnection of routes, and complexity of operation, for example, a back-up protection system disclosed in Japanese Patent Application Laid-Open No. Hei 6-276663 and a conventional countermeasure against circuit breaker non-operation have been proposed. As an improvement measure, a wide-area protection device disclosed in Japanese Patent Application Laid-Open No. 4-133614 is considered. Hereinafter, a plurality of examples of the related art will be specifically described.

[1. Example of back-up protection scheme] First, as a first example of the prior art, FIG. 24 shows a back-up protection scheme for eliminating delay in operation time, route disconnection, and complicated operation.
This will be described with reference to FIG. Here, FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram illustrating an example of a conventional back-up protection system disclosed in Japanese Patent No. 76663.

FIG. 24 shows a transmission line composed of three electric stations A, B and C and two lines connecting them. In the figure, 1001A, 1001B Party A, 1001B Party B,
1001C Party A and 1001C Party B are Electric Station A, Electric Station B,
Each of the individual buses of the C substation is shown. And
Reference numerals 1021, 1022, 1031, and 1032 denote individual transmission lines connecting the A and B electric stations and the B and C electric stations, respectively.

Further, 1002A1CB, 1002A2C
B, 1002B1CB, 1002B2CB, 1003B
1CB, 1003B2CB, 1003C1CB, 100
3C2CB includes transmission lines 1021, 1022, 1031,
Each circuit breaker (CB) at both ends of 1032 is shown. Reference numerals 1001BCB and 1001CCB indicate circuit breakers for bus connection at the B electric station and the C electric station, respectively. Also, 1002A1, 1002A2, 1002B
1,1002B2,1003B1,1003B2,10
03C1 and 1003C2 are individual distance relays (DZ) provided at AC stations in order to detect an accident in the direction of the transmission line.

Here, the distance relay (DZ) is a first-stage relay (DZ1) for detecting an accident up to about 80% of the opposite terminal of the transmission line, and settled to about 120% of the next section to prevent an accident of the opposite bus. It comprises a second-stage relay (DZ2) for sure detection, and a third-stage relay (DZ3) set at 300% to 500% for detecting a next section accident. Among them, the second stage relay (DZ2) can change the operation time limit set according to external conditions.

Also, B-BD1, C-BD1, B-BD
2. The C-BD 2 is an individual bus separation relay (BD) for shutting off the bus connection CB of the B electric station and the C electric station, respectively, in order to detect the insteps in the insteps of the insteps and to detect the injuries in the direction of the maiden buses.
, And is composed of a distance relay.

On the other hand, 1004B is a distance relay (DZ)
And a transfer control device (TT) for transmitting the operation state of the bus separation relay (BD). And 1005TA, 100
5TB, 1006TB, and 1006TC are transmission devices that connect between the A and B electric stations and between the B and C electric stations, respectively. Also, 1005T and 1006T are transmission lines, which are shown in the example of micro wireless.

In the back-up protection system having the above configuration,
The transmission lines 1031 and 1032 between the B and C electric stations are short-distance transmission lines, the transmission lines 1021 and 1022 between the A and B electric stations are long-distance transmission lines, and the distance relay 1002A of the A electric station
If the second-stage relay (DZ2) of the distance relay 1002A1 and 1002A2 is set to detect an accident at the C electric station bus, the second-stage relay (DZ2) of the distance relay 1002A1 and 1002A2 Distance relay 1003B1,
The operation time is longer than that of the second stage relay (DZ2) of 1003B2.

In this case, since the operation time of the bus B at the B substation is long, the operation of the bus separation relay B-BD1 or B-BD2 at the B substation and the distance relays 1003B1, 1003
Under the condition that the first-stage relay (DZ1) of 3B2 is inoperative, it is determined that an accident has occurred at the B electric station bus, and a transmission signal for shortening the accident is transmitted from the B electric station to the A electric station. This is for performing timer shortening control of the second stage relay (DZ2) of the relays 1002A1 and 1002A2.

[2. Example of Circuit Breaker Non-operation Countermeasure System] Next, as a second example of the prior art, a system using a circuit breaker non-operation countermeasure device (CBF device) will be described. FIG. 25 is a configuration diagram showing an example of a conventional CBF system disclosed in Japanese Patent Application Laid-Open No. 4-133614.

In FIG. 25, a power system composed of a double bus of A and B and a transmission line of TL1 to TL4 connected to the A bus, and a bus protection device 210 for protecting the A bus.
1. Transmission line protection device 21 that protects transmission line TL1
2 and 2103, and a circuit breaker non-operation countermeasure device 2104 of the circuit breaker CB1. Each device 2101 to 210
The operation of No. 4 is as follows.

The bus protection device 2101 includes current transformers CT2 and CT2.
Current is input from CT6, CT10, CT12, and CT13, the presence or absence of an instep bus accident is determined by a current differential method, and when an accident is detected, circuit breakers CB1, CB3,
A shutoff command is output to CB5 to CB7.

The transmission line protection device 2102 includes a current transformer CT1
Of the transmission line 1 is determined by a current differential method in which the current of the current line and the current of CT4 transmitted from the transmission line protection device 103 at the opposite terminal are input, and when the accident is detected,
A break command is output to the breaker CB1. At this time, breaker C
B2 similarly outputs a cutoff command from the transmission line protection device 2103. In general, recently, P
A current differential relay using CM transmission is applied. PCM
In the current differential method using transmission, sampling synchronization control is performed between the transmission line protection devices in order to sample the current of the current transformer CT at the same time between the opposite ends.

The circuit breaker inoperability countermeasure device 2104 is provided with the current of the current transformer CT1 and the cutoff output S2 of the transmission line protection device 2102.
Enter 102. The current of the current transformer CT1 is input to the overcurrent relay 2105, and outputs an output S2101 when the overcurrent relay 2105 operates. The logical product of the output S2101 and the cutoff output S2102 is taken, and if both are output, the result is output as S2103. This output is input to the timed operation circuit 2106 which delays the output by a predetermined time, and the output S2106 of the timed operation circuit 2106 is cutoff. Vessels CB3, CB
5 to CB7.

As described above, if the current continues to flow through the current transformer CT1 even after the interruption command to the circuit breaker CB is output at the time of the transmission line accident, it is determined that the interruption has failed, and the connection to the instep bus is made. It is trying to minimize the damage by stopping only all the lines that are running.

[3. Example of Wide-Area Protection System] Next, as a third example of the prior art, a system using a wide-area protection device in which the performance of a conventional circuit breaker non-operation countermeasure device is improved will be described. FIG. 26 is a configuration diagram showing an example of a conventional wide-area protection system disclosed in Japanese Patent Application Laid-Open No. 4-133614.

In FIG. 26, bus protection device 300
1 is to convert each terminal current of the instep bus CT2, CT6, C
It is connected to an optical fiber cable HB for inputting from T10, CT12, and CT13, or for outputting a sampling signal to each of the terminal devices T1 to T5.

The output of the optical signal from the bus protection device 3001 is distributed by the star coupler 3002 to the individual terminal devices T1 to T5 via the optical fiber cables H1 to H5. The individual terminal devices T1 to T5 change the current transformers CT2 and CT according to the input sampling signal.
6, and converts the current inputs from CT10, CT12, and CT13 into digital signals, and outputs the digital signals to the bus protection device 3001 via the individual optical fiber cables H1 to H5.

The bus protection device 3001 uses the terminal currents input via the optical fiber cable HB to determine the presence or absence of an accident in the instep bus by a current differential protection method. And if an accident is detected on the Kou bus,
The individual trip commands S1B to S5B are output to the optical fiber cable HB.

The trip commands S1B to S5B are input to the individual terminal devices T1 to T5, respectively, and output to the corresponding individual circuit breakers CB1, CB3, CB5 to CB7. The transmission line protection device 3003 receives the current of the current transformer CT1 and the current of the current transformer CT4 transmitted from the partner transmission line protection device 3004 by the PCM transmission system 3005 in order to protect the transmission line TL1. I do. in this case,
The transmission line protection device 3003 includes a current transformer CT1 and a current transformer CT.
In order to sample the current of the transmission line 4 at the same time, sampling synchronization control is performed with the transmission line protection device 3004.

The sampling signal obtained by this simultaneous sampling 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 3006 as the sampling signal S1. The transmission line protection device 3003 inputs 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 transmission line CT1. , CT4 as digital data S2A, S2B.
06 is output. The transmission line protection device 3003 includes a transmission line T
When the accident of L1 is detected, a trip command S3 is output to the circuit breaker CB1. At this time, the circuit breaker CB2 at the other end
Is similarly cut off by a trip command S4 from the transmission line protection device 3004.

The wide area protection device 3006 includes a terminal device T10, a time difference calculating means 3007, a correcting means 3008,
It comprises an operation determining means 3009. The operation of these components is as follows.

The terminal device T10 includes a bus protection device 3001
Are connected to the star coupler 3002 by an optical fiber cable H10 to input the bus terminal currents and the sampling signal, which are input to the circuit breakers CB3, CB5 to CB7, and to output the individual trip commands S2B to S5B. ing. The time difference calculating means 3007 is provided by the terminal device T10
And the sampling signal S1 output from the transmission line protection device 3003, calculate the time difference between the signals, and obtain the time difference data S6.
Is output.

The correction means 3008 receives the digital bus converted all-terminal current data S7 and the time difference data S6 output from the terminal device T10. The bus terminal current data S7 is corrected by the time indicated by the time difference data S6 to create bus terminal current data, and the current data S8A of the current transformer CT2 and the current data S8 other than the current transformer CT2 are generated.
B is output. By this correction, the transmission line protection device 300
The bus terminal current data sampled at the same time as the sampling time in 3,3004 can be obtained.

In the operation determining means 3009, the current differential relay 3010 outputs the current data S2B and the current data S8
B is inputted, and the presence or absence of an accident in the transmission line TL1 and the instep bus is determined. And when an accident is detected,
The trip signal S9 is output to the time limit operation circuit 3011.
The time limit operation circuit 3011 receives the trip signal S9,
If the trip signal S9 is still input after the elapse of the predetermined time, the trip signal S10 is output.

On the other hand, the time limit operation circuit 3012 receives the current data S8A, adds the absolute value of the
It is determined whether a current is flowing through B1. Then, when a current is flowing through the circuit breaker CB1, a trip signal S11 is output. Further, the AND circuit 3013 receives the trip signal S10 and the trip signal S11, and outputs a trip signal S12 when both signals are present. The trip signal S12 is output to the transmission line protection device 3003 to shut off the circuit breaker CB2,
It is output to the terminal device T10 in order to cut off the circuit breakers CB3, CB5 to CB7.

When the trip signal S12 is input, the transmission line protection device 3003 puts a trip signal on the transmission data, and thereby the transmission line protection device 3004 at the other end.
To transmit the signal. This technique is commonly known as a transfer trip. Although not shown, the same wide-area protection device as the wide-area protection device 3006 is installed in the opposite bus, and protects the transmission line TL1 and the bus to which the transmission line TL1 is connected.

As described above, the wide-area protection system shown in FIG. 26 first receives the first input means (transmission line protection devices 3003 and 3004) for inputting the current at the opposite end of the transmission line protection device.
And second input means (terminal device T1) for inputting currents of terminals other than the transmission line terminals in the bus protection device 3001.
0), and a time difference calculating means 3007 for calculating a time difference between the sampling timings of the transmission line protection devices 3003 and 3004 and the bus protection device 3001. The wide-area protection system also has the second function based on the result of the time difference calculating means.
Correction means 3008 for correcting the output of the input means of the first input means and outputting an output current having the same sampling timing as the output current of the first input means, and the output current of the first input means and the second
Operation determination means 3009 for inputting the output current of the input means and determining the operation by the current differential protection method. The operation determining means 3009 is configured to output a trip command to both or one of the circuit breakers of the opposing end of the transmission line and the bus terminal other than the transmission line terminal when an accident is detected. I have.

In this wide-area protection system, since one transmission line and a bus connected to the transmission line are targeted, the transmission line protection device and the bus protection device can be used for any accident of the transmission line and the bus. Even in the case where the fault cannot be eliminated due to the circuit breaker inoperability even when the circuit breaker is used, a trip command can be output to the circuit breaker of the bus terminal other than the opposite end of the transmission line and the transmission line terminal. As a result, circuit breaker non-operation is reliably detected to minimize the influence.

[0034]

In each of the conventional examples described above, it is possible to individually improve the performance in terms of shortening the time required for eliminating accidents and taking measures against circuit breaker non-operation. However, considering the overall performance, while having a main protection function that detects accidents at high speed and high sensitivity and eliminates accidents in the minimum section, it also provides comprehensive protection functions over a wide area power system. It does not implement a system that has

Accordingly, an object of the present invention is to provide a main protection function realized in an existing system, and to provide a transmission line, a bus,
Accidents such as transformers can be detected quickly and with high sensitivity and can be immediately removed in the minimum section, and at the time of failure of related equipment such as circuit breakers, voltage transformers, and current transformers, or when the system is out of sync. It is an object of the present invention to provide an excellent wide-area protection system and a method thereof, which have an overall protection function over a wide-area electric power system and can respond immediately.

[0036]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention determines an accident section of a power system using electric quantities of a plurality of predetermined terminals of a power system, and shuts off the power supply according to the accident section. A wide-area protection system and method for an electric power system that eliminates an accident by sending a shutdown command to a switch has the following features. That is, the input electric quantity of each terminal equipment (RTE) individually provided on a predetermined basis with respect to each terminal of the transmission line, bus division, bus connection, and each terminal of the transformer in the protection section divided by the circuit breaker is calculated by each RTE By transmitting the data to the central processing unit (CTE) as the data of the CTE, the CTE side uses the data of each RTE to determine the accident section and the appearance of the accident, and based on the judgment result, opens the circuit breaker and removes the accident. This enables protection of a wide-area power system.

[0037] The wide area protection system according to the first aspect is characterized by having a data acquisition unit, a determination unit, a control information transmission unit, and a control information processing unit. Here, the data acquisition unit converts the input electric quantity of each RTE into digital data based on the sampling timing obtained from the time synchronization signal device (STE), and transmits the data and the operation state of the system to the CTE. It is. The determination means is means for determining the accident section and the accident aspect on the CTE side using the data of each RTE obtained by the data acquisition means. Further, the control information transmitting means is means for transmitting circuit breaker control information for controlling the circuit breaker determined based on the determination result to the RTE determined based on the determination result of the determination means, The control information processing means receives the circuit breaker control information from the control information transmitting means on the RTE side, performs predetermined processing based on the circuit breaker control information, and outputs a control output to the circuit breaker as necessary. It is a means to do.

Among these means, the judgment means performs a differential operation using the current data obtained by the data acquisition means to thereby determine the minimum fault section and the fault condition classified by the circuit breaker. It has a section determination function. Further, when the accident section and the accident aspect are judged by the minimum section judging function of the judging means, the control information transmitting means cuts off the RTE of the accident section by the circuit breaker determined based on the judgment result. It has a shutoff command transmission function for transmitting an shutoff command for performing an operation for accident removal.

The wide area protection method according to claim 11 is obtained by grasping the wide area protection system according to claim 1 from the aspect of the method.
It is characterized by having steps corresponding to the functions of the control information transmitting means and the control information processing means, respectively. That is, a data acquisition step corresponding to the function of the data acquisition means, a minimum section determination step corresponding to the minimum section determination function of the determination means, an accident removal block corresponding to the accident removal block command transmission function of the control information transmission section. It has a command transmission step and a cutoff command processing step corresponding to a part of the function of the control information processing means.

A program recording medium according to a sixteenth aspect is a recording medium recording a program for causing a computer to execute the wide area protection method according to the eleventh aspect, and the program is stored in a first computer. The data acquisition step and the cutoff command processing step are executed while the second computer executes the minimum section determination step and the cutoff command transmission step for accident elimination.

According to the above-described configuration, the system information from each RTE is transmitted to the CTE.
Side uses it immediately and efficiently to perform differential operation on the minimum section divided by the circuit breaker, thereby detecting the minimum fault section and fault condition with high speed and high sensitivity, and The accident can be eliminated immediately by shutting off the corresponding circuit breaker. In addition, data obtained on multiple RTE
Side to make a comprehensive decision and transmit the circuit breaker control information to the RTE side according to the decision result, while having a main protection function equivalent to the main protection device provided individually for each line, In addition, one system can protect a wide-area power system.

A wide area protection system according to a second aspect is characterized in that, in the wide area protection system according to the first aspect, the determination means and the control information transmission means each have an additional function. That is, when the fault section determined by the minimum section determining function is a recloseable transmission line fault, the determining means determines that the control information transmitting means has performed a predetermined shut-down command transmission from the preceding shut-off command transmission by the fault removing shut-off command transmitting function. After a lapse of time, there is a synchronization determination function for determining whether or not synchronization between buses adjacent to the accident section is possible. Further, the control information transmitting means, when it is determined by the synchronization determining function of the determining means that the synchronization between the buses can be performed, performs a closing operation to the predetermined circuit breaker in a cutoff state with respect to the RTE in the accident section. It has an input command transmission function for synchronous input for transmitting an input command for performing the input.

According to this configuration, when a system is separated by accident removal, the accident can be quickly recovered and the separated system can be interconnected. In other words, if the system is separated by accident elimination and the accident section is a transmission line accident that can be reclosed, the fault phase interruption and the synchronization between buses adjacent to the accident section should be detected and reclosed. Therefore, the accident can be quickly recovered.

A wide area protection system according to a third aspect is characterized in that, in the wide area protection system according to the first aspect, the determination unit and the control information transmission unit each have an additional function. That is, the determining means has a phase difference determining function of determining the phase difference of the predetermined bus voltage using the voltage data obtained by the data obtaining means. Further, the control information transmitting means, when it is determined by the phase difference determining function of the determining means that the inter-bus voltage has a change of 180 degrees or more in the phase difference, performs the determination result on the RTE of the section including the bus. Has a function of transmitting a disconnection command for causing the circuit breaker to perform a disconnection operation determined on the basis of the disconnection command for step-out protection.

According to this configuration, step-out protection can be performed, and stable operation continuation of the power system can be achieved. In other words, when a disturbance occurs in the power system, each generator group may accelerate and decelerate, which may lead to step-out. , And the section where the out-of-step locus has passed can be cut off, so that the operation of the system can be continued.

The wide area protection system according to a fourth aspect is characterized in that, in the wide area protection system according to the first aspect, the determination means and the control information transmission means have additional functions. That is, the determination means determines that the accident section determination by the minimum section determination function has continued for a predetermined time or more without being canceled even after transmission of the preceding shutdown command by the accident removal shutdown command transmission function of the control information transmission means. In addition, by regarding the current data from the RTE as 0 and performing a differential operation on a section adjacent to the fault section,
It has an extended section determination function for determining an accident in an extended section including the accident section. Further, the control information transmitting means, when it is determined by the expanded section determining function of the determining means that there is an accident in the expanded section, performs a breaking operation on the RTE of the expanded section based on the determination result based on the determination result. And has a shut-off command transmitting function for coping with a shut-down failure.

The wide area protection method according to the twelfth aspect is obtained by grasping the wide area protection system according to the fourth aspect from the aspect of the method. And a step corresponding to each function of the control information transmitting means. That is, it has an enlarged section determination step corresponding to the enlarged section determination function of the determination means, and a cutoff command transmission step for the cutoff failure corresponding to the cutoff failure transmission function of the control information transmitting means for the cutoff failure.

According to the above-described configuration of the fourth and twelfth aspects, it is possible to reliably protect against an accident when the circuit breaker does not operate. In other words, even when the failure of the accident section fails due to the circuit breaker non-operation, the failure of the interruption is detected by continuing the accident determination for a predetermined time or more, and the interruption command is issued to the circuit breaker of the adjacent section including the accident section. In addition, accidents can be eliminated by a single system, and the time for eliminating accidents can be reduced.

The wide area protection system according to the fifth aspect is characterized in that, in the wide area protection system according to the first aspect, the determination means and the control information transmission means each have an additional function. That is, the determining means uses the data obtained by the data acquiring means to determine whether or not any of the RTEs has a defect.
When the TE failure determination function determines that an RTE failure has occurred, the section for differential operation is expanded using data of another RTE surrounding the defective RTE, and an expanded differential operation is performed, thereby causing an accident in the expanded section. And an enlarged section determination function for performing determination. Further, the control information transmitting means, when it is determined by the expanded section determining function of the determining means that there is an accident in the expanded section, sends the defective RTE to another RTE in the expanded section.
Has a function of transmitting a preceding shutoff command for preemptively shutting off the circuit breaker under the control of the failure RTE.

Further, the determination means performs a differential operation of each of the minimum protection sections including the defective RTE after a lapse of a predetermined time from the transmission of the preceding shutdown command by the shutdown command transmission function for handling the defective RTE of the control information transmitting means. Has an RTE defective section determination function of determining a minimum accident section. The control information transmitting means transmits a shutoff command for causing the circuit breaker determined based on the determination result to perform a shutoff operation to the RTE of the accident section determined by the RTE defective section determination function of the determining means. And has a function of transmitting a cutoff command for removing an RTE defective section accident.

The wide area protection method according to claim 13 is obtained by grasping the wide area protection system according to claim 5 from the aspect of the method. In the wide area protection method according to claim 11, the determination of claim 5 is performed. And a step corresponding to each function of the control information transmitting means. That is, an RTE failure determination step and an enlarged section determination step respectively corresponding to the RTE failure determination function and the enlarged section determination function of the determination means, and a failure RTE corresponding to the cutoff command transmission function for dealing with a failure RTE of the control information transmission means.
An interrupting command transmission step for coping, an RTE defective section determining step corresponding to the RTE defective section determining function of the determining means,
And a shutoff command transmitting step for removing an RTE faulty section accident corresponding to a shutoff command transmitting function for removing an RTE faulty section accident of the control information transmitting means.

According to the fifth and thirteenth aspects of the present invention, it is possible to provide reliable protection against accidents when the RTE is defective. That is, an RTE failure is detected, an accident is determined in an expanded section including the defective RTE, and if an accident occurs in the expanded section, the circuit breaker in charge of the defective RTE is preliminarily shut off and after a predetermined time has elapsed. The smallest accident section in the expanded section is detected, and the circuit breaker corresponding to the accident section is shut off to immediately eliminate the accident.

A wide area protection system according to a sixth aspect is characterized in that the control information processing means has an additional function in the wide area protection system according to the first aspect.
That is, the control information processing means includes: an accident detection function for detecting an accident using the system electricity input to the RTE;
Only when the circuit breaker control information received from E coincides with the information obtained by the accident detection function, a control information evaluation function for performing control output to the circuit breaker according to the circuit breaker control information is provided.

According to this configuration, even when the breaker control information from the CTE side is incorrect, it is possible to avoid erroneous control output to the breaker. That is, C
TE failure, transmission device or transmission system error, or RT
If the circuit breaker control information received from the CTE side is incorrect due to a failure in E, an incorrect control output for the circuit breaker is used by utilizing the fact that this information does not match the information by the accident detection function on the RTE side. Can be avoided,
Reliability can be improved.

According to a seventh aspect of the present invention, in the wide area protection system according to the first aspect, the RTE side includes an identification unit and a CTE failure detection unit, and the control information processing unit has an additional function. It is characterized by: Here, the identification means is means for converting the input electric quantity of the RTE into digital data based on the sampling timing obtained from the STE on the RTE side, and using the data to identify an accident direction and an accident section. , CT
The E failure detection means is a means for detecting a CTE failure and a transmission failure with the CTE on the RTE side. Further, the control information processing means has a backup control output function of performing a control output to the circuit breaker determined based on the output of the identification means when the CTE failure detection means detects a CTE failure or transmission failure. .

The wide area protection method according to the fourteenth aspect is obtained by grasping the wide area protection system according to the seventh aspect from the aspect of the method. And a step corresponding to each function of the CTE failure detecting means and the control information processing means. That is, it has an identification step corresponding to the function of the identification means, a CTE failure detection step corresponding to the CTE failure detection means, and a backup control output step corresponding to the backup control output function of the control information processing means.

According to the above configuration, even when the CTE side is defective, the protection function can be continued by the RTE alone. That is, when the RTE detects such a defect or abnormality in the event of a CTE failure or an abnormality in the transmission device or transmission system, a backup function such as an accident detection function on the RTE side and a control output function corresponding thereto is used. Thus, the protection function can be continued by the RTE alone, and the reliability can be improved.

The wide area protection system according to the eighth aspect is characterized in that the data acquisition means has an additional function in the wide area protection system according to the first aspect. That is, the data acquisition means calculates the input electric quantity of each RTE,
Based on the sampling timing obtained from the STE, the data is converted into digital data, and the data and the operating state of the system are added with the sampling time obtained from the STE and the name of the terminal to be subjected to differential calculation, and the terminal information to be calculated is included. And configured to transmit the data to a plurality of CTEs.

According to this configuration, even when a failure occurs on the CTE side, the protection function can be continued with another healthy CTE. In other words, when a failure occurs in the CTE or the transmission system of the RTE data transmission destination, the data is transmitted to another sound CTE so that necessary data can be easily obtained based on the operation target terminal information in the sound CTE. Since it can be obtained, the protection function can be continued with this sound CTE, and the reliability can be improved.

A wide area protection system according to a ninth aspect is characterized in that the data acquisition means has an additional function in the wide area protection system according to the first aspect. That is, the data acquisition means calculates the input electric quantity of each RTE,
The digital data is converted into digital data based on the sampling timing obtained from the STE, and the sampling time obtained from the STE and the specific CT
A code for designating E is added to the data including destination designation information, and the data is transmitted to a plurality of the CTEs.

According to this configuration, even when the CTE is defective, the protection function can be continued with another healthy CTE. That is, by using the destination designation information, C
Since it is possible to efficiently transmit data to a designated CTE using an appropriate transmission path without having to connect the TE and RTE with a fixed transmission path, the CTE of the data transmission destination
In this case, even if a failure occurs, data can be transmitted to another healthy CTE, and the protection function can be continued with this healthy CTE. Therefore, reliability can be improved,
Excellent transmission efficiency.

The wide area protection system according to claim 10 is
2. The wide area protection system according to claim 1, wherein the data acquisition means has an additional function, and the RTE side has a CT function.
It is characterized by having E failure detection means and transmission destination switching means. That is, the data acquisition unit is configured to transmit the data of each RTE to a plurality of CTEs. The CTE failure detecting means is a means for detecting a CTE failure on the RTE side, and the transmission destination switching means is a CTE failure detecting means.
When the CTE failure is detected by the failure detection means, the information transmission destination of the RTE which is the transmission destination of the defective CTE at that time is changed to a healthy CTE.

The wide area protection method according to the fifteenth aspect grasps the wide area protection system according to the tenth aspect from the aspect of the method. It has a data acquisition step, a CTE failure detection step, and a transmission destination switching step corresponding to the acquisition means, the CTE failure detection means, and the transmission destination switching means, respectively.

According to the above-described configuration of the tenth and fifteenth aspects, even when the CTE is defective, another sound CT is obtained.
At E, the protection function can be continued. That is, CT
If an E failure occurs and the RTE detects the failure, the data transmission destination is switched to another sound CTE.
Data can be transmitted to this healthy CT
The protection function can be continued at E, and the reliability can be improved.

[0065]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1. First Embodiment] A first embodiment according to the present invention will be described below.
An embodiment of a basic wide area protection system according to the invention described in FIG. 11 will be described with reference to FIGS.

[1-1. System Configuration] FIG. 1 is a configuration diagram schematically showing the configuration of a wide-area protection system, and 10 indicates a power system. 11A to 11E indicate buses of individual electric stations included in the power system 10,
Reference numerals 12A to 12D denote transmission lines connecting electrical stations. Also, 14-1 to 14-4, 15-1 to 18-1
Denotes the current transformer (CT) and the circuit breaker (CB) with the same reference numerals, and 21 to 25 denote transformers (PT).

On the other hand, reference numerals 101-1 to 101-N denote terminal devices (RTE), and these terminal devices (RTE)
E) each terminal of the transmission line in the protection section divided by the circuit breaker,
The bus section, bus connection, and each terminal of the transformer are individually provided on a predetermined basis. 202 is a GPS (G
robal Positioning System)
Alternatively, it is a terrestrial synchronization network that obtains time synchronization using a terrestrial transmission line, and 201 is a time synchronization network (time synchronization signal device: STE) that distributes the synchronization signal.

Reference numeral 401 denotes a wide area data transmission network, which is constituted by, for example, microwave or optical transmission. Reference numeral 402 denotes a central processing unit (CT
E). This central processing unit has a built-in MPU and has an arithmetic function and a transmission / reception function for transmission.
A protection operation and a sequence operation are performed based on data from a terminal device (RTE).

[1-2. System Operation] An outline of the system operation of FIG. 1 having the above configuration is as follows. Each terminal device (RTE) 101 is obtained by a GPS or terrestrial synchronous network 202, and a time synchronous network (STE)
The current of each part of the power system 10 is converted to a current transformer (CT) 14 based on the sampling timing distributed by using the
-1 to 14-4 and 15-1 to 18-1 and the voltage of each bus 11A to 11E is changed by a transformer (PT) 21.
Take from ~ 25. Each terminal device 101 transmits the acquired information of the power system 10 to the central processing unit 402 via the wide area data transmission network 401.

The central processing unit (CTE) 402 determines, based on the information of the power system 10 transmitted from each terminal device (RTE) 101, the minimum fault section and fault condition classified by the circuit breaker. Performs protection operation by differential operation. In this protection operation, the central processing unit 402 uses information on the current transformer selected according to the operation target section.
For example, the central processing unit 402 uses information of the current transformers 14-1 and 15-1 provided at the opposite end of the transmission line 12A in the protection calculation of the transmission line 12A. In the protection calculation of the bus 11A, information of the current transformers 14-1 to 14-4 provided at each end of the bus 11A is used.
According to the determination result obtained by the protection operation, the circuit breaker control information for opening and closing the circuit breaker is transmitted to the central processing unit 402.
Is transmitted to the relevant terminal devices 101 via the wide area data transmission network 401. Each terminal device 101 performs a predetermined process based on the breaker control information transmitted from the central processing unit (CTE) 402, and performs a breaker (C
The control output for B) is performed.

[1-3. Configuration of Terminal Device] FIG. 2 is a configuration diagram schematically showing the configuration of the terminal device (RTE) 101, including an input unit 301, an output unit 302, and a data transmission / reception unit 30.
3 and an SP synchronization control unit 304.
The functions of the units 301 to 304 are as follows.

The input section 301 has a function of taking in a current in the transmission line 12 connected to the bus 11 from a current transformer (CT) and a function of taking in a voltage in the bus 11 from a transformer (PT). The SP synchronization control unit 304 has a function of taking in information for sampling synchronization from the time synchronization signal device (STE) 201 and a function of determining a sampling timing of taking in current and voltage. Data transmission / reception unit 303
Has a function of transmitting and outputting current and voltage information to the wide area data transmission network 401 and a function of receiving circuit breaker control information from the central processing unit 402. The output unit 302 has a function of performing a predetermined process based on the circuit breaker control information received by the data transmission / reception unit 303, and then performing a control output to the circuit breaker (CB) as necessary.

[1-4. Configuration of Central Processing Unit] FIG.
FIG. 2 is a configuration diagram schematically illustrating a configuration of a central processing unit (CTE) 402, which includes a data transmission / reception unit 311, a data control unit (memory unit) 312, a data bus 313, an arithmetic processing unit 314,
And a determination processing unit 315. Each part 31
The functions 1 to 315 are as follows.

The data transmitting / receiving unit 311 has a function of taking in system information from the wide area data transmission network 401 and a function of the decision processing unit 31.
5 has a function of transmitting and outputting the result of the judgment processing of the accident section and the accident situation to the wide area data transmission network 401. The data control unit (memory unit) 312 temporarily stores the system information from each terminal device (RTE) 101 received by the data transmission / reception unit 311 to thereby store each terminal device (RT
E) It has a function of absorbing a difference in transmission delay time of system information transmitted from the 101 to the central processing unit (CTE) 402 via the wide area data transmission network 401. The arithmetic processing unit 314 has a function of performing a protection arithmetic operation based on the current differential principle based on the system information stored in the data control unit (memory unit) 312. The judgment processing unit 315 has a function of judging an accident section and an accident condition on condition that the protection operation result by the operation processing unit 314 exceeds a preset detection level.

[1-5. Specific configuration of terminal device] FIG.
1 is a configuration diagram showing an example of a specific configuration of a terminal device (RTE) 101, which includes a current input converter 102, a voltage input converter 103, an analog filter (AF) 104, and an analog / digital converter (ADC). 105, data bus 1
06, a sampling clock section (SP) 107, an input / output section (I / O) 108, a data transmission / reception section 109, a device information input circuit 110, and a circuit breaker control output circuit 111. The functions of the components 102 to 111 are as follows.

The input converters 102 and 103 convert each electric quantity taken into the terminal device (RTE) 101 from the current transformer (CT) and the transformer (PT) installed in the power system into a voltage signal. It has a function to do. Analog filter (A
F) 104 has a function of removing the high-frequency components unnecessary for the operation included in the system by using the outputs of the input converters 102 and 103 as inputs. Analog / digital converter (AD
C) 105 has a function of sampling the output of the analog filter (AF) 104 to convert it into a digital signal. Sampling clock unit (SP) 1
07 has a function of determining the sampling timing in the analog / digital converter (ADC) 105 based on the sampling synchronization information taken from the time synchronization signal device (STE) 201.

The device information input circuit 110 has a circuit breaker (C
B) and a function to capture the open / close state of devices such as disconnector (LS). An input / output unit (I / O) 108 has a function of converting system status information of the system taken from the device information input circuit 110 into a digital signal, and a circuit breaker It has a function of controlling and outputting to the circuit breaker (CB) via the control output circuit 111. The data transmission / reception unit 109 includes an analog / digital conversion unit (A
It has a function of transmitting and outputting the digital amount acquired in the DC) 105 to the wide area data transmission network 401 and a function of receiving circuit breaker control information transmitted from the central processing unit (CTE) 402.

[1-6. Configuration of time synchronization signal device] FIG.
FIG. 1 is a configuration diagram schematically showing a configuration of a time synchronization signal device (STE) 201, which includes a timing extraction circuit 211 and a distribution circuit 212. The timing extraction circuit 211 has a function of taking in time information from the GPS or the terrestrial synchronization network 202 and generating sampling timing synchronization information of the terminal device (RTE) 101. The distribution circuit 212 includes one or a plurality of terminal devices (RTE) 1
01 has a function of outputting sampling timing synchronization information. These circuits have already been put to practical use.

[1-7. Accident removal processing of central processing unit]
FIG. 6 is a flowchart showing an outline of the accident elimination process in the central processing unit (CTE) 402.
A4. The flow of this accident removal processing is as follows.

First, in process A1, the current value is taken from the data control unit (memory unit) 312 (FIG. 3), and then in process A2, the current is divided by the circuit breaker by the arithmetic processing unit 314 (FIG. 3). The protection operation based on the current differential principle is performed for the minimum section. In this process A2, individual differential operation is performed for each of a large number of protection sections such as each transmission line section of a plurality of transmission lines # 1 to #N and each bus section of a plurality of buses # 1 to #N. In connection with this, the subsequent processes A3 and A4 are also performed individually for each target section.

In the processing A3, the judgment processing section 315 (FIG. 3) determines that each target section is the smallest accident section on condition that the result of the protection operation by the processing A2 exceeds a preset detection level. Is determined. If the target section is determined to be the minimum accident section in this process A3, the terminal device connected to the circuit breaker constituting the minimum accident section by the data transmission / reception section 311 in the next process A4. (RTE)
A cutoff command for the circuit breaker is output to 101.

[1-8. Specific Example of Accident Elimination Operation] For example, when a system failure occurs in the transmission line 12A of the power system 10 of FIG. 1, the current transformers (CT) 14-1 and 15-1 at the opposite ends of the transmission line 12A. The transmission line section 12A is determined as the minimum accident section by the protection calculation using the acquired current information. Based on this determination result, the central processing unit (CTE) 402 sends a signal to the terminal device (RTE) 101 connected to the circuit breakers 14-1 and 15-1 at both ends of the transmission line section 12A. A shutoff command is output. In the terminal device (RTE) 101,
Central processing unit (CT) via the wide area data transmission network 401
E) The shutdown command from 402 is received, and based on the shutdown command, the terminal device (RTE) 101
B) A shutoff command is output to 14-1 and 15-1,
The accident in the transmission line section 12A is eliminated.

[1-9. Operation / Effect] As described above, according to the wide-area protection system according to the present embodiment, the central processing unit (CTE) 402 captures the current information obtained by each terminal device (RTE) 101 immediately. Efficiently use and perform protection calculation based on the current differential principle for the minimum section divided by the circuit breaker,
The minimum fault section and fault condition of a bus, transformer, etc. can be detected at high speed and high sensitivity, and the fault can be immediately eliminated by shutting off the circuit breaker corresponding to the fault section.

Further, a central processing unit (CTE) 402 comprehensively makes a decision using data obtained by a plurality of terminal devices (RTEs) 101, and controls a circuit breaker determined based on the decision result. Since the device control information is transmitted to the terminal device (RTE) 101 connected to the circuit breaker, the main protection function equivalent to the conventional main protection device using the current differential principle installed on a line basis is provided. While having
One system can protect a wide-area power system.

Therefore, according to the wide-area protection system according to the present embodiment, while having the main protection function realized in the existing system, the transmission line, the bus, the transformer, etc. It is possible to realize an excellent wide-area protection system that can detect accidents at high speed and high sensitivity and immediately remove them.

[2. Second Embodiment] A second embodiment of the present invention will now be described with reference to FIG. 7 to FIG. 9 will be described. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. Since the synchronization input function is added to the protection function of the system, only the features related to the synchronization input function will be described below.

[2-1. Principle of Synchronization] FIG. 7 is a principle diagram schematically showing the principle of synchronization performed in the wide-area protection system according to the present embodiment. In FIG. 7, a terminal device (RT) connected to the opposite end of the transmission line 12A is shown.
E) 101A and 101B are time synchronization signal devices (ST
E) Sampling timing is determined based on the synchronization information fetched from 201A and 201B, and bus voltage values are sampled from transformers 21 and 22 to obtain digital information. The obtained voltage value is transmitted to the central processing unit (CTE) 402 via the wide area data transmission network 401.

In the central processing unit (CTE) 402, a system failure occurs in the transmission line section 12A, the circuit breakers (CB) 14-1 and 15-1 at both ends thereof are cut off, and the bus 11
When A and 11B become different circuits, the buses 11A and 11B are based on the voltage information taken from the wide area data transmission network 401.
The voltage phase difference between B is calculated. Central processing unit (CT
E) 402, when the calculated voltage phase difference is smaller than a preset value, determines that synchronization can be performed;
A command to turn on the circuit breakers (CB) 14-1 and 15-1 is output to the terminal devices 101A and 101B at both ends of the transmission line 12A, and the buses 11A and 11B are interconnected again.

[2-2. Synchronous Input Process] FIG. 8 is a flowchart showing an outline of the synchronous input process in the central processing unit (CTE) 402, and is composed of processes B1 to B9. The flow of this processing is as follows.

First, in process B1, a current value is fetched from the data control unit (memory unit) 312 (FIG. 3). Then, in process B2, the current differential principle is applied to the minimum section divided by the circuit breaker. Perform a protection operation. In this process B2, an individual differential operation is performed for each of a large number of protection sections such as each transmission line section of a plurality of transmission lines # 1 to #N and each bus section of a plurality of buses # 1 to #N. However, in connection with this, the following processes B3 to B9 are also performed individually for each target section.

Then, in the process B3, it is determined whether or not each target section is the minimum accident section on the condition that the result of the protection calculation by the process B2 exceeds a preset detection level. If it is determined in this process B3 that the target section is the minimum accident section, in the next processing B4, the terminal device (RTE) 101 connected to the circuit breaker constituting the minimum accident section is A break command for the circuit breaker (CB) is output.

Thereafter, in a process B5, the elapse of a predetermined time (T) is waited, and in the next process B6, the voltage phase of the buses 11A and 11B adjacent to the fault section is determined. In the next process B7, one bus 1
It is determined that the phase difference の of voltage VB of bus 11B with respect to voltage VA of 1A remains at a preset phase angle k. Further, in processing B8, the bus 11
It is determined that the magnitudes of the voltages VA and VB of A and 11B are within a predetermined range set in advance. In the next process B9, the central processing unit (CTE) 402
Transmits to the terminal device (RTE) 101 connected to the circuit breaker (CB) interrupted by the process B4,
The injection command of B) is output.

[2-3. Principle of Voltage Phase Determination] FIG.
FIG. 4 is a principle diagram schematically showing the principle of voltage phase determination performed by a central processing unit (CTE) 402. In FIG. 9, the voltage of one bus 11A is VA, and the voltage of the other bus 1A is VA.
The voltage of 1B is VB. And one of the voltages VA
Is used as a reference voltage, and the absolute value of the phase difference の from the voltage VA of the other voltage VB is evaluated. That is, on condition that the absolute value of the phase difference Θ is smaller than the preset phase difference k, and that the magnitudes of the voltage VA and the voltage VB are both within the preset range. (CTE) 402 determines that the bus 11A and the bus 11B are in a state where synchronization can be performed.

[2-4. Operation / Effect] As described above, according to the wide-area protection system according to the present embodiment, if the power line accident where the accident section can be reclosed when the system is separated by accident elimination, the accident phase is cut off Later, the voltage information of the bus adjacent to the accident section is transferred to a central processing unit (CTE) 4.
Since the synchronization determination is efficiently performed while taking in immediately in 02, the synchronization between buses can be detected and the circuit can be closed again, so that the accident can be quickly recovered. Therefore, according to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, the accident can be quickly restored after the accident phase is cut off, and the separated system can be interconnected. Is obtained.

[3. Third Embodiment] Hereinafter, as a third embodiment of the present invention, an embodiment of a wide area protection system capable of step-out protection according to the invention of claim 3 will be described with reference to FIGS. This will be described with reference to FIG. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. Since the step-out protection function is added to the protection function of the system, only the features relating to the step-out protection function will be described below.

[3-1. System Configuration] FIG. 10 is a configuration diagram schematically showing the configuration of a wide area protection system. In FIG. 10, V _{A to} V _C are voltage vectors of the buses 11A to 11C, which are taken in by the terminal device (RTE) 101 and transmitted to the central processing unit (CTE) 402. The central processing unit (CTE) 402
It has a function of determining whether or not a step-out phenomenon has occurred in the power system 10 using each transmitted voltage value. If it is determined that the step-out phenomenon has occurred in the protection section, the central processing unit (CTE) 402 selects the minimum protection section from the sections in which the step-out phenomenon has been determined,
It has a function of outputting a disconnection command of the circuit breaker to an appropriate terminal device (RTE) 101 connected to the circuit breaker constituting the selected section.

[3-2. Principle of Step-out Determination] FIG. 11 is a principle diagram schematically showing the principle of step-out determination performed by the central processing unit (CTE) 402.
A region up to 80 degrees is α, and a region from 180 degrees to 270 is β. In FIG. 11, _{VA to} V
_C represents each of the buses 11A to 11C included in the protection section (FIG. 1).
0) shows a voltage vector captured by the terminal device (RTE) 101. Central processing unit (CT
E) 402, the phase angle of each two voltage vectors, i.e., the voltage vector V _A, the phase angle of V _B, the voltage vector V
The phase angles of _B and V _{C and} the phase angles of the voltage vectors V _C and V _A are respectively calculated, and it is determined from the calculation results whether or not a step-out phenomenon has occurred in the protection section.

Here, as an example, the step-out determination based on the voltage vectors V _A and V _C will be described. Assuming that one voltage vector _VA is a reference phase, this voltage vector _VA is represented as a vector on the X-axis (0 degree direction). The other voltage vector V _C is the voltage vector V _A
Is expressed as a vector having a phase angle of In this condition, the central processing unit (CTE) 402 is subjected to V _C has entered a region alpha, when a transition is made to a region beta, determines that step-out phenomenon in the transmission line section 12B (FIG. 10) has occurred . Further, it is determined in the same conditions, after the voltage vector V _C enters a region beta, even if the transition to the region alpha, shall step-out phenomenon occurs similarly transmission line section 12B.

[3-3. Operation / Effect] As described above, according to the wide-area protection system according to the present embodiment, when a step-out phenomenon occurs in the protection section, the step-out protection can be quickly performed by determining the step-out phenomenon. it can. That is,
When a disturbance occurs in the power system, each generator group may accelerate and decelerate, and may eventually lose synchronism.However, the existence of a synchronizing locus in the protection section indicates that multiple bus voltages Judgment is made using the phase difference, and the breaker (CB) in the section where the out-of-step trajectory has passed can be shut off, so that stable operation of the power system can be continued. Therefore,
According to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, when a step-out phenomenon occurs, step-out protection is quickly performed, and operation of the system can be continued. Can be obtained.

[4. Fourth Embodiment] Hereinafter, as a fourth embodiment of the present invention, an embodiment of a wide-area protection system according to the fourth and twelfth aspects of the present invention, which enables protection when a circuit breaker does not operate. Will be described with reference to FIGS. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. Since the protection function when the circuit breaker does not operate is added to the protection function of the system, only the features related to the protection function when the circuit breaker does not operate will be described below.

[4-1. FIG. 12 is a flowchart showing an outline of an accident elimination process when the circuit breaker is inactive (CBF) in the central processing unit (CTE) 402, and is composed of processes C1 to C8. I have. The flow of this processing is as follows.

First, in process C1, a current value is fetched from the data control unit (memory unit) 312 (FIG. 3). Then, in process C2, the current differential principle is applied to the minimum section divided by the circuit breaker. Perform a protection operation. In this process C2, an individual differential operation is performed for each of a large number of protection sections such as each transmission line section of a plurality of transmission lines # 1 to #N and each bus section of a plurality of buses # 1 to #N. However, in connection with this, the following processes C3 to C8 are also performed individually for each target section.

In the process C3, it is determined whether or not each target section is the minimum accident section on the condition that the result of the protection operation performed in the step C2 exceeds a preset detection level. If it is determined in this process C3 that the target section is the minimum accident section, in the next processing C4, the terminal device (RTE) 101 connected to the circuit breaker constituting the minimum accident section is A break command for the circuit breaker (CB) is output.

After the cutoff command is output in the process C4, in a process C5, the elapse of a predetermined time (T) is waited, and in the next process C6, the accident determination is canceled even after the elapse of the predetermined time (T). It is determined whether or not an accident removal failure (CBF) has occurred in the system on condition that the system is continued without any error. If it is determined in this process C6 that the accident removal has failed, in the next process C7, the process C3
, The current taken from the current transformer (CT) in the section determined to be the fault section is regarded as “0”, and the expanded differential operation is performed. That is, an individual differential operation is performed on each of the minimum sections adjacent to the accident section.

Then, in the process C8, an accident judgment of the expanded section is performed on condition that the result of the differential operation in the process C7 exceeds a preset detection level. If it is determined in this process C8 that there is an accident in the enlarged section, in the next process C9, the terminal device (RTE) 101 connected to the circuit breaker (CB) constituting the accident section is shut down. Outputs a command to shut off the heater.

[4-2. FIG. 13 shows a specific example of a failure in removing an accident in a transmission line section when an accident occurs at a point f in a transmission line section 12A as a specific example of a failure in removing an accident (CBF) in a transmission line section. It is explanatory drawing which shows the case where interruption | blocking fails. Hereinafter, the operation of the central processing unit (CTE) 402 in this case will be described.

First, in process C1, the current transformer (CT)
The current values taken in from 14-1 and 15-1 are taken in. Next, in process C2, protection based on the current differential principle is performed on the transmission line section 12A which is the minimum section divided by the circuit breaker (CB). Perform the operation. Then, in the process B3, the fault section is determined on the condition that the result of the protection calculation by the process C2 exceeds a preset detection level, and the transmission line section 12A is determined to be the fault section. In accordance with this determination, in the next process C4, the circuit breakers (CB) 14-1, 1 constituting the transmission line section 12A.
For the terminal device (RTE) 101 connected to 5-1
It outputs the cutoff command of those breakers.

After the shutoff command is output in the process C4, in a process C5, the elapse of a predetermined time (T) is waited, and in the next process C6, the accident determination is canceled even after the elapse of the predetermined time (T). It is determined whether or not the accident removal is successful on the condition that the accident removal is continued, and it is determined that an accident removal failure (CBF) has occurred in the system. In response to this determination, in process C7, the current transformer (CT) 14- of the transmission line section 12A determined as the accident section in process C3.
1, 15-1 is regarded as “0”, and the current transformer (C) constituting a section adjacent to the transmission line section 12A is regarded as “0”.
The differential operation of the adjacent section is performed using the current taken from T).

That is, in this example, bus section 1
Using the currents taken from the current transformers (CT) 14-1 to 14-4 constituting the 1A, the differential operation of the bus section 11A is performed, and the current transformer (CT) is also performed on the bus 11B.
The differential operation of the protection section including 15-1 is performed. At this point, the circuit breaker (CB) 15-1 has completed the interruption by the process C4, and the current taken from the current transformer (CT) 15-1 is "0". In the above, no accident is detected in the differential operation of the protection section including the current transformer (CT) 15-1.

In the process C8, an accident is determined on condition that the result of the differential operation in the process C7 exceeds a preset detection level. As a result, the current transformer (CT) 14-1 is activated. It is determined that there is an accident in the adjacent bus section 11A. In the next process C9, the terminal device (RTE) 101 connected to the circuit breakers (CB) 14-2 to 14-4 constituting the bus section 11A determined to have the accident is transmitted to the terminal devices (RTE) 101. Outputs the shutdown command.

[4-3. FIG. 14 shows a specific example of an accident removal failure (CBF) in a bus section. When an accident occurs in a bus section 11A, a circuit breaker (CB) 14-1 shuts off. It is explanatory drawing which shows the case where it failed. Hereinafter, the operation of the central processing unit (CTE) 402 in this case will be described.

First, in process C1, the current transformer (CT)
The current values taken in from 14-1 to 14-4 are taken in. Next, in process C2, a protection operation based on the current differential principle is performed on the bus section 11A which is the minimum section divided by the circuit breaker (CB). Is carried out. Then, in the process C3, the accident section is determined on the condition that the result of the protection calculation by the process C2 exceeds the preset detection level, and the bus section 11A is determined to be the accident section. In accordance with this determination, in the next process C4, circuit breakers (CB) 14-1 to 14-4 constituting bus section 11A.
To the terminal device (RTE) 101 connected to the terminal device.

After the cutoff command is output in the process C4, in a process C5, the elapse of a predetermined time (T) is waited, and in the next process C6, the accident determination is canceled even after the elapse of the predetermined time (T). It is determined whether or not the accident removal is successful on the condition that the accident removal is continued, and it is determined that an accident removal failure (CBF) has occurred in the system. In accordance with this determination, in the process C7, the current transformers (CT) 14-1 to 14-1 of the bus section 11A determined as the accident section in the process C3.
The current taken from 14-4 is regarded as “0”, and the differential operation of the adjacent section is performed using the current taken from the current transformer (CT) constituting the section adjacent to the bus section 11 </ b> A.

That is, in this example, bus section 1
Current transformer (C) constituting transmission line section 12A adjacent to 1A
T) Differential operation is performed using the currents taken from 14-1 and 15-1, and the current transformers (C) are similarly similarly applied to the other transmission lines 12B to 12D adjacent to the bus section 11A.
T) The same differential operation is performed for the protection sections including 14-2 to 14-4. At this point, the circuit breaker (CB)
14-2 to 14-4 have been completely cut off by the process C4, and the current taken from the current transformers (CT) 14-2 to 14-4 is "0". , Protection section including current transformer (CT) 14-2, transmission line 1
Protection section including current transformer (CT) 14-3 in 2C,
No accident is detected in any differential operation of the protection section including the current transformer (CT) 14-4 in the transmission line 12D.

In process C8, an accident is determined on condition that the result of the differential operation in process C7 exceeds a preset detection level. As a result, the current transformer (CT) 14-1 is determined. It is determined that there is an accident in the transmission line section 12A, which is an adjacent section including. In the next process C9, the transmission line section 12A determined to have an accident
Is output to the terminal device (RTE) 101 connected to the circuit breaker (CB) 15-1 which constitutes the circuit breaker.

[4-4. Operation / Effect] As described above, according to the wide-area protection system according to the present embodiment, even when the break of the accident section fails due to the breaker inactivity, the failure determination is continued by the accident determination for a predetermined time or more. By detecting the operation and outputting a shutoff command to the circuit breaker in an adjacent section including the accident section, the accident can be eliminated by a single system, and the time for eliminating the accident can be reduced.

Hereinafter, the fault elimination time when the circuit breaker is not operated will be described with reference to FIG. Here, FIG.
The operation time of the differential operation is 30 ms, and the operation time of the breaker is 4
It is a time chart which shows an example of an accident elimination time by a wide area protection system at the time of a circuit breaker failure at 0 ms. As shown in FIG. 15, the operation continuation confirmation time until the current value control after the differential operation is 40 ms, the operation time after the current value control is 30 ms, and the central processing unit (CTE) 402 transfers the terminal device (RTE) 101 to the terminal device (RTE) 101. If the sum of the transmission delay time of the transmitted cutoff command and the processing time in the terminal device (RTE) 101 is 10 ms, the accident elimination time is 1
It will be 50 ms. Therefore, the time required for removing an accident can be significantly reduced as compared with the time required for removing an accident using a conventional distance relay, which is about 200 ms.

Therefore, according to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, it is possible to eliminate an accident at the time of a circuit breaker failure with a single system. In addition, when a circuit breaker is defective, an effect can be obtained that an accident can be eliminated at a higher speed than in a conventional distance relay.

[5. Fifth Embodiment] Hereinafter, as a fifth embodiment of the present invention, an embodiment of a wide area protection system capable of protecting a terminal device from failure according to the inventions of claims 5 and 13 will be described. The configuration will be described with reference to FIGS. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. Since the protection function at the time of terminal device failure is added to the protection function of the system, only the features relating to the protection function at the time of terminal device failure will be described below.

[5-1. FIG. 16 is a flowchart showing an outline of an accident elimination process when the terminal device (RTE) 101 fails in the central processing unit (CTE) 402, and is composed of processes D1 to D8. . The flow of this accident removal processing is as follows.

First, in process D1, the terminal device (RT
E) The transmission information (current value) fetched from 101 is fetched from a data control unit (memory unit) 312 (FIG. 3).
In process D2, it is determined whether or not the terminal device (RTE) 101 has a defect based on the aspect of the transmission information fetched in process D1. In this process D2, the terminal device (RTE)
If it is determined that there is a defect in 101, the subsequent processing D
3. Terminal equipment determined to be defective (RTE)
The minimum protection section including 101 is expanded, and the differential operation is performed on the expanded section.

Then, in the process D4, an accident judgment of the expanded section is performed on condition that the result of the protection operation in the process D3 exceeds a preset detection level. If it is determined in this process D4 that there is an accident in the enlarged section, in the next process D5, a shutoff command for shutting off the circuit breaker connected to the terminal device (RTE) determined to be defective in process D2. Is output to another terminal device (RTE) of the extended section.

After the cutoff command is output in the process D5, in a process D6, the elapse of a predetermined time (T) is waited, and in the next process D7, the accident determination is canceled even after the elapse of the predetermined time (T). It is determined whether or not the operation is continued. Then, in the process D7, when it is determined that the accident continues, in the next process D8, the terminal device (RT
Individual differential operation is performed for each minimum protection section including E).

Then, in the process D9, an accident is determined in that section on condition that the result of the differential operation in the process D8 exceeds a preset detection level. If it is determined in this process D9 that there is an accident, in the next process D10, the terminal device (RTE) connected to the circuit breaker (CB) constituting the section where the accident is determined is interrupted. Outputs a command to shut off the heater.

[5-2. Specific Example of Accident Removal Process When Terminal Device Fails] FIG. 17 is an explanatory diagram showing a case where a failure occurs in the terminal device (RTE) 101A as a specific example of the accident removal process when a terminal device fails. Hereinafter, the operation of the central processing unit (CTE) 402 in this case will be described.

First, in order to detect an accident in the transmission line section 12A, a transmission taken from the current transformers (CT) 15-1 and 14-1 and transmitted through the terminal devices (RTE) 101D and 101A. The information is fetched, and a protection operation is performed using the transmission information. In this state, the terminal device (RTE) 101A
When a fault occurs, the current transformer (CT) connected to this
Since it becomes impossible to capture the current information of 14-1,
Transmission line section 12A composed of current transformers (CT) 14-1, 15-1, and current transformers (CT) 14-1, 14-2,
The protection calculation for the bus section 11A constituted by 14-5 cannot be performed.

In this case, in this system, after detecting that a failure has occurred based on the transmission information taken from the terminal device (RTE) 101A (processes D1 and D2),
By performing the enlarged differential operation (process D3), the protection function in the protection sections 11A and 12A is continued. That is,
The terminal devices (RTE) 101B to 10D surrounding the terminal device (RTE) 101A in which the failure has occurred are transmitted from the current transformer (C).
T) The protection functions of the protection sections 11A and 12A are continued by taking in the currents of 14-2, 14-5 and 15-1, and performing a differential operation on the enlarged section formed by these current transformers. .

Then, the terminal device (RTE) in which the defect has occurred
A system fault occurs in any of the protection sections 11A and 12A including the current transformer (CT) 14-1 connected to 101A,
When an accident is detected by the central processing unit (CTE) 402 (process D4), the terminal device (R
A cutoff command for shutting off the circuit breaker (CB) 14-1 connected to the TE) 101A is output to another terminal device (RTE) 101C in the extended section (process D5).
If it is determined that the accident continues after a preset time (T) has elapsed (process D6) after the shutoff command (process D6), the differential operation is performed for each of the protection sections 11A and 12A. (Process D8). Furthermore, the presence or absence of an accident is determined on the condition that the result of the protection operation exceeds a preset detection level. If it is determined that an accident has occurred in one of the sections (process D9), the presence of the accident is determined. It outputs a disconnection command for the terminal device (RTE) 101 connected to the circuit breaker (CB) constituting the determined section.

[5-3. Operation / Effect] As described above, according to the wide-area protection system according to the present embodiment, even when terminal device (RTE) 101 has failed, information transmitted from a terminal device adjacent to the failed terminal device By expanding the range in which the differential operation is performed using, the accident detection function of the wide area protection system can be continued. Further, when an accident is detected in the expanded section, a power failure range of the system can be minimized by outputting a power-off command prior to the circuit breaker to which the faulty terminal is connected. Furthermore, even after the shutoff command is output, an accident can be detected within the extended protection range, so even if the accident could not be eliminated by a preceding shutoff command, the surrounding circuit breakers would be shut off to ensure that the accident was eliminated. It is possible to do.

Therefore, according to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, even if an accident occurs in a section including the defective terminal device when the terminal device is defective, The effect is obtained that the accident can be reliably removed while keeping the power outage range of the system to the minimum.

[6. Sixth Embodiment] Hereinafter, as a sixth embodiment of the present invention, an embodiment of a wide area protection system in which a terminal device has an accident detection function according to the invention of claim 6 will be described. This will be described with reference to FIG. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. Since an accident detection function is added to the terminal device (CTE) of the system, only features relating to the accident detection function will be described below.

[6-1. Specific Configuration of Terminal Device] FIG.
Is a configuration diagram showing an example of a specific configuration of the terminal device (RTE) 101, and has basically the same configuration as the terminal device of FIG. 4 according to the first embodiment. That is, the current input converter 102 and the voltage input converter 10
3, analog filter (AF) 104, analog / digital conversion unit (ADC) 105, data bus 106, sampling clock unit (SP) 107, input / output unit (I /
O) 108, a data transmitting / receiving unit 109, a device information input circuit 110, and a circuit breaker control output circuit 111.

In the terminal device (RTE) 101 of FIG. 18, in addition to this configuration, the terminal device (RTE)
The current input converter 112, the voltage input converter 113, the analog filter (AF) 114, and the analog / digital converter (ADC) as a single fault detection function unit (FD)
115, data bus 116, arithmetic processing unit (CPU) 11
7 and an input / output unit (I / O) 118. Reference numeral 119 in the figure denotes an AND circuit for realizing a control information evaluation function.

The functions of the constituent elements 102 to 111 among the constituent elements described above are basically the same as those of the terminal device of FIG. 4 described above. 109 and input / output unit (I /
O) The circuit breaker control information 108A output from 108 is
Instead of being output as it is via the circuit breaker control output circuit 111, it is sent to the AND circuit 119.

Further, among the components 112 to 118 of the accident detection function section (FD), the current input converter 112, the voltage input converter 113, and the analog filter (AF) 11
4, and an analog / digital converter (ADC) 115
Are similar to those of the current input converter 102, the voltage input converter 103, the analog filter (AF) 104, and the analog / digital converter (ADC) 105. That is, these components 112
115, each electric quantity taken into the terminal device from the current transformer (CT) and the transformer (PT) of the power system is processed, and is output as a digital signal from the analog / digital converter (ADC) 105. .

On the other hand, the arithmetic processing unit (CPU) 117 of the accident detection function unit (FD) includes an analog / digital conversion unit (A
A function of performing a protection operation using digital information output from the DC (DC) 115 to detect whether or not an accident has occurred in the power system 10, and an input / output unit ( It has a function of outputting, via the I / O) 118, circuit breaker control information 118A according to the detection result.

The circuit breaker control information 118A from the accident detection function (FD) is sent to the AND circuit 119, like the circuit breaker control information 108A received from the central processing unit (CTE) 402. That is, this A
Central processing unit (CTE) by using ND circuit 119
Breaker control information 108A from the terminal device (RTE)
Only when the circuit breaker control information 118A independently obtained matches, the circuit breaker (C
B).

[6-2. Operation / Effect] In the wide area protection system according to the present embodiment having the above configuration, the central processing unit (CTE) 402, the wide area data transmission network 401, and the central processing unit (RTE) 101 fail due to a failure in the terminal apparatus (RTE) 101 or the like. If the circuit breaker control information 108A received from the device (CTE) is incorrect, the circuit breaker control information 108A does not match the circuit breaker control information 118A unique to the terminal device (RTE) 101. ) Does not cause erroneous control output. That is,
It is possible to reliably prevent a situation in which an erroneous shutoff command is output to the circuit breaker (CB) and the power system 10 is unnecessarily shut down.

Therefore, according to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, it is possible to reliably prevent the control output to the circuit breaker based on incorrect circuit breaker control information. In addition, since an unnecessary power failure of the power system can be prevented, the effect that reliability can be improved can be obtained.

[7. Seventh Embodiment] Hereinafter, as a seventh embodiment of the present invention, an embodiment of a wide area protection system in which a terminal device has a backup function according to the inventions of claims 7 and 14 will be described. Will be described with reference to FIG. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation and effect as the wide area protection system according to the sixth embodiment, and according to the sixth embodiment. System terminal (CT
Since the backup function is added to E), only the features relating to the backup function will be described below.

[7-1. Specific configuration of terminal device] FIG.
Is a configuration diagram illustrating an example of a specific configuration of a terminal device (RTE) 101, and basically includes components 102 to 119 similar to the terminal device of FIG. 18 according to the sixth embodiment. The functions of these components 102 to 119 are the same as those of the terminal device of FIG. 18 described above.

In the terminal device (RTE) 101 shown in FIG. 19, in addition to this configuration, an arithmetic processing unit (CP
U) 120 is provided, and is connected to an analog / digital converter (ADC) 105, an input / output unit (I / O) 108, and a data transmitting / receiving unit 109 via a data bus 106. The arithmetic processing unit (CPU) 120
A central processing unit (CTE) 402 is provided to the data transmitting / receiving unit 109.
When it is detected that the transmission data from the PC has stopped arriving or that there is inconsistent information in the transmission data, some abnormality has occurred in the central processing unit (CTE) 402 or the transmission system, and it does not function normally. It has the function of determining

When the arithmetic processing unit (CPU) 120 determines that the central processing unit (CTE) 402 and the transmission system do not function, the analog / digital conversion unit (ADC) 1
A function for performing a protection operation using the digital information output from the power system 05 to detect whether or not an accident has occurred in the power system 10, and a function for detecting a system accident in the power system 10 as a result of the protection operation. , Performs a protection operation using existing direction elements, distance elements, and the like, and uses the input / output unit (I
/ O) 108 to output the circuit breaker control information 108B via the / O) 108.

[7-2. Operation / Effect] In the wide area protection system of the present embodiment having the above configuration, the central processing unit (CTE) 402 and the wide area data transmission network 401
If the terminal device (RTE) 10 has a failure and does not function, the operation processing unit (CPU) 120 of the terminal device (RTE) 101 detects this, and thereafter, the terminal device (RTE) 10
1 using the backup function provided in the terminal device (R
The protection function can be continued by the TE) 101 alone.
In other words, the terminal device (RTE) 101 performs a protection operation, thereby enabling the terminal device to detect an accident. If an accident is detected, circuit breaker control information corresponding to the detection result is output to shut off the terminal. By operating the CB, the accident can be reliably removed.

Therefore, according to the wide area protection system according to the present embodiment, in addition to the effects of the sixth embodiment, even if a failure occurs in the central processing unit or the transmission system, it is provided on the terminal device side. By utilizing the backup function, the protection function can be continued by the terminal device alone, and the effect of increasing reliability can be obtained.

[8. Eighth Embodiment] Hereinafter, as an eighth embodiment of the present invention, an embodiment of a wide area protection system having a function of switching a central processing unit according to the invention of claim 8 will be described. This will be described with reference to FIGS. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. In the system, a function for switching the central processing unit is added, and only features relating to this function will be described below.

That is, the feature of this system is that the terminal device (RTE) 101 adds the time synchronization information acquired from the time synchronization signal device (STE) to the information of the current value taken from the current transformer (CT). In addition, terminal information indicating which terminal is to be subjected to differential operation with respect to current information is added and transmitted to the central processing unit (CTE) 402. Then, the central processing unit (CTE) 4 of the transmission destination
02 has failed, another central processing unit (CT
E) 402 makes it possible to easily obtain information necessary for differential operation using the time synchronization information and the operation target terminal information. Hereinafter, the processes of the central processing unit and the terminal device will be sequentially described.

[8-1. Accident removal processing of central processing unit]
FIG. 20 is a flowchart showing an outline of the accident elimination process in the central processing unit (CTE) 402.
To E6. The flow of this accident removal processing is as follows.

First, in process E1, a current value is fetched from the data control unit (memory unit) 312 (FIG. 3). Next, in process E2, the current value obtained from the operation target terminal for which the operation is requested is obtained. Central Processing Unit (CTE) 4
02 confirms whether it is taking in. If it is confirmed in the process E2 that the current value of the calculation target terminal is not taken in, the necessary current information is taken in from the appropriate terminal device (RTE) 101 in the next process E3. In this case, in this system, as described above, in the information transmitted from the terminal device (RTE) 101, the time synchronization information acquired from the time synchronization signal device (STE) and the current information of any terminal are targeted. Since the operation target terminal information indicating whether to perform the differential operation is included, necessary current information can be easily acquired by using the time synchronization information and the operation target terminal information.

Subsequently, in a process E4, a protection operation based on the current differential principle is performed on the minimum section divided by the circuit breaker. Then, in the process E5, the accident section is determined on the condition that the result of the protection calculation exceeds the preset detection level. If it is determined in this process E5 that the section is an accident section, in the following process E6, a shutoff command for the circuit breaker is output to the (RTE) 101 connected to the circuit breaker constituting the minimum section divided by the circuit breaker. I do.

[8-2. Switching Processing at the Time of Central Processing Unit Failure] FIG. 21 is a flowchart showing the outline of switching processing of the central processing unit in the terminal device (RTE) 101 when the central processing unit (CTE) 402 has failed. It is composed of The flow of this switching process is as follows.

First, in process F1, a current value is acquired from the current transformer (CT), and then, in process F2, the time synchronization information acquired from the time synchronization signal device (STE) is converted into the current information acquired in process F1. To be added. In the next process F3, calculation target terminal information is added to the information obtained in the process F2. Then, in a process F4, it is determined whether or not there is a failure in the central processing unit (CTE) 402. If it is determined that there is a failure, in a succeeding process F5, the central processing unit ( CTE) 402 is switched. In the next process F6, current information is transmitted and output to the central processing unit (CTE) 402 of the transmission destination.

[8-3. Operation / Effect] As described above, according to the wide-area protection system apparatus according to the present embodiment, the central processing unit (C)
TE) 402, when detecting that a failure has occurred in the wide area data transmission network 401, has a function of switching a destination central processing unit that performs a protection operation, and then transmits the current information to the central processing unit. By transmitting the synchronization time information and the operation target terminal information necessary for the protection operation, the newly selected central processing unit easily obtains the current information required for the protection operation and continues the protection function. be able to.

Therefore, according to the wide area protection system according to the present embodiment, in addition to the effects of the first embodiment, even if a failure occurs in the central processing unit or the transmission system, another sound central protection system is provided. The effect that the protection function can be easily continued by the processing device and the reliability can be improved can be obtained.

[9. Ninth Embodiment] Hereinafter, as a ninth embodiment of the present invention, an embodiment of a wide area protection system having a function of switching a central processing unit according to the ninth embodiment of the present invention will be described. This will be described with reference to FIG. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation and effect as the wide area protection system according to the first embodiment.
In the system according to the embodiment, a function for switching the central processing unit is added.
Only features relating to this function will be described.

[9-1. Configuration of Transmission Format] FIG.
2 is a terminal device (RTE) 101 to a central processing unit (C
FIG. 4 is an explanatory diagram illustrating an outline of a transmission format of information transmitted to a TE (TE) 402. As shown in FIG. 22, the transmission format includes a central processing unit designation unit 501, electric quantity information 502, device opening / closing information 503, sampling timing information 504, and the like. Details of this information are as follows.

The information included in the central processing unit designating section 501 is a code unique to each central processing unit (CTE) 402, and the wide area data transmission network 401 refers to this information to convert the transmission information into a target central processing unit. The device (CTE) 402 can be reached. The electric quantity information 502 is stored in the terminal device (R
TE) 101, a current transformer (CT), a transformer (P
This is a sampling of the quantity of electricity of the system 10 obtained from T). The device opening / closing information 503 is information on the opening / closing state of a circuit breaker (CB), a disconnecting switch (LS), and the like. The sampling timing information 504 is the terminal device (RTE) 1
01 is information on the time at which the system electricity was sampled. Note that the electric quantity information 502, the device opening / closing information 503, and the sampling timing information are used for a protection calculation performed in the central processing unit (CTE).

[9-2. Operation / Effect] According to the wide area protection system apparatus according to the present embodiment, as described above, by including destination designation information in transmission information, central processing unit (CTE) 402 and terminal device (RTE) 101 To a designated central processing unit (CTE) using an appropriate transmission line without having to connect to a fixed transmission line between
The transmission information can be efficiently transmitted to 402. Therefore, even when the terminal device (RTE) 101 detects a failure of the central processing unit (CTE) 402, it is possible to separate transmission destinations by using the destination designation information without fixing the transmission path. To the appropriate central processing unit, and the protection function can be easily continued.

Therefore, according to the wide area protection system of this embodiment, in addition to the effects of the first embodiment, even if a failure occurs in the central processing unit, there is no need to fix the transmission path. The protection function can be easily continued by another appropriate central processing unit using an appropriate transmission line, so that the reliability can be increased.
The effect that the transmission efficiency is excellent is obtained.

[10. Tenth Embodiment] In the following,
As a tenth embodiment according to the present invention,
The embodiment of the wide area protection system having the function of switching the central processing unit according to the invention described in FIG.
This will be described with reference to FIG. Note that the wide area protection system according to the present embodiment has basically the same configuration, operation, and effect as the wide area protection system according to the first embodiment, and according to the first embodiment. In the system,
Since a function for switching the central processing unit is added, only features relating to this function will be described below.

[10-1. Specific example of switching processing at the time of failure of central processing unit] FIG. 23 shows a central processing unit (CTE) 402.
A plurality of central processing units (CTE) 402 exist as a specific example of the switching process when
It is an explanatory view showing a case where TE) 402A has failed. Hereinafter, the operation of the system in this case will be described.

First, the terminal device (RTE) 101 transmits current information via the wide area data transmission network 401. The transmission path of the current information is indicated by a dotted line. Terminal device (R
The TE) 101 can transmit another current central processing unit (CT) capable of transmitting current information via the wide area data transmission network 301 when the central processing unit (CTE) 402A fails.
E) Transmit current information to 402B. The central processing unit (CTE) 402B uses the transmitted current information to perform a protection operation similar to that performed by the central processing unit (CTE) 402A before the failure, thereby providing a system protection function. To take over. At the same time, the protection operation that has been performed by itself is continued.

[10-2. Action / Effect]
According to the wide-area protection system device according to the present embodiment, even when central processing unit (CTE) 402A fails, terminal device (RTE) 101 sets the transmission destination of current information to another central processing unit (CTE). Central processing (CTE) 402B which has been changed to 402B and has become a new transmission target.
, The protection function can be continued by expanding the protection calculation target.

Therefore, according to the wide-area protection system according to the present embodiment, in addition to the effects of the first embodiment, even if a failure occurs in the central processing unit, another sound central processing unit can be used. The effect that the protection function can be easily continued by expanding the protection calculation target and the reliability can be improved can be obtained.

[11. Other Embodiments] It should be noted that the present invention is not limited to the above-described embodiments, and various other forms may be included within the scope of the present invention, for example, by appropriately combining the plurality of embodiments. It is feasible. For example, specific configurations and operations of the central processing unit and each terminal device used in the present invention can be appropriately selected. In addition, for various units such as a data acquisition unit, a determination unit, a control information transmission unit, and a control information processing unit that configure the system, and various functions of these units, various hardware resources and software resources are used. It can be realized by appropriately combining them.

[0166]

As described above, according to the present invention, the input electric energy of each terminal device (RTE) is transmitted to the central processing unit (CTE) as data of each RTE, and the data of each RTE is transmitted on the CTE side. Judgment of the accident section and the aspect of accidents using, the circuit breaker is opened based on the judgment result and the accident is eliminated, so that accidents of transmission lines, buses, transformers, etc. can be detected at high speed and high sensitivity. It is possible to provide an excellent wide-area protection system having a main protection function that can be immediately removed in a minimum section and a comprehensive protection function over a wide-area power system, and a method thereof.

Further, by providing the central processing unit with various additional judgment functions, the data acquired by the terminal unit can be used to control related devices such as a circuit breaker, a voltage transformer, and a current transformer. Since a failure, a system step-out, a failure of the terminal device itself, and the like can be detected, it is possible to immediately cope with each situation and improve a protection function. Furthermore, by providing the terminal device itself with an accident detection function and the system with a function of switching the central processing unit, even if a failure occurs in the central processing unit or transmission system, the protection function can be continued and the system can be protected. Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing the configuration of a wide-area protection system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram schematically illustrating a configuration of a terminal device (RTE) in the wide area protection system of FIG. 1;

FIG. 3 is a configuration diagram schematically showing a configuration of a central processing unit (CTE) in the wide area protection system of FIG. 1;

FIG. 4 is a configuration diagram showing an example of a specific configuration of a terminal device (RTE) in the wide area protection system of FIG. 1;

FIG. 5 is a configuration diagram schematically illustrating a configuration of a time synchronization signal device (STE) in the wide area protection system of FIG. 1;

FIG. 6 is a flowchart showing an outline of an accident elimination process in a central processing unit (CTE) in the wide area protection system of FIG. 1;

FIG. 7 is a principle diagram showing an outline of a principle of synchronization input performed in a wide area protection system according to a second embodiment of the present invention.

FIG. 8 is a flowchart showing an outline of synchronization input processing in a central processing unit (CTE) in the wide area protection system according to the second embodiment of the present invention.

FIG. 9 is a principle diagram schematically showing the principle of voltage phase determination performed by a central processing unit (CTE) in a wide area protection system according to a second embodiment of the present invention.

FIG. 10 is a configuration diagram schematically showing a configuration of a wide area protection system according to a third embodiment of the present invention.

FIG. 11 is a principle diagram schematically showing the principle of step-out determination performed by a central processing unit (CTE) in the wide area protection system of FIG. 3;

FIG. 12 is a flowchart showing an outline of an accident elimination process in a central processing unit (CTE) when a circuit breaker is inoperative (CBF) in a wide area protection system according to a fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram showing a specific example at the time of accident removal failure (CBF) in a transmission line section in the wide area protection system according to the fourth embodiment of the present invention.

FIG. 14 is an explanatory diagram showing a specific example at the time of accident removal failure (CBF) in a bus section in the wide area protection system according to the fourth embodiment of the present invention.

FIG. 15 is a time chart showing an example of an accident elimination time when a circuit breaker is defective in the wide-area protection system according to the fourth embodiment of the present invention.

FIG. 16 is a flowchart showing an outline of an accident removal process when a terminal device (RTE) fails in a central processing unit (CTE) in a wide area protection system according to a fifth embodiment of the present invention.

FIG. 17 is an explanatory diagram showing a specific example of an accident removal process when a terminal device fails in the wide area protection system according to the fifth embodiment of the present invention.

FIG. 18 is a configuration diagram showing an example of a specific configuration of a terminal device (RTE) in the wide area protection system according to the sixth embodiment of the present invention.

FIG. 19 is a configuration diagram showing an example of a specific configuration of a terminal device (RTE) in the wide area protection system according to the seventh embodiment of the present invention.

FIG. 20 is a flowchart showing an outline of an accident elimination process in a central processing unit (CTE) in a wide-area protection system according to an eighth embodiment of the present invention.

FIG. 21 is a flowchart showing an outline of switching processing of a central processing unit (RTE) in a terminal device (RTE) when a central processing unit (CTE) fails in a wide area protection system according to an eighth embodiment of the present invention. .

FIG. 22 is an explanatory diagram schematically showing a transmission format of information transmitted from a terminal device (RTE) to a central processing unit (CTE) in the wide area protection system according to the ninth embodiment of the present invention.

FIG. 23 is an explanatory diagram showing a specific example of a switching process when a central processing unit (CTE) fails in the wide area protection system according to the tenth embodiment of the present invention.

FIG. 24 is a configuration diagram showing an example of a conventional back-up protection system.

FIG. 25 is a configuration diagram illustrating an example of a conventional CBF system.

FIG. 26 is a configuration diagram illustrating an example of a conventional wide area protection system.

[Explanation of symbols]

10 Power system 11A-11E Bus 12A-12D Transmission line 14-1-14-4, 15-1-18-1 Current transformer (C
T) or circuit breaker (CB) 21-25 Transformers (PT) 101, 101-1 to 101-N, 101A to 101E
... terminal devices (RTE) 102, 112 ... current input converters 103, 113 ... voltage input converters 104, 114 ... analog filters (AF) 105, 115 ... analog / digital converters (ADC) 106, 116 ... data Bus 107 Sampling clock unit (SP) 108 Input / output unit (I / O) 109 Data transmission / reception unit 110 Device information input circuit 111 Circuit breaker control output circuit 117, 120 Operation processing unit (CPU) 118 Input Output unit (I / O) 119 AND circuit 201, 201A, 201B Time synchronization network (time synchronization signal device: STE) 202 GPS or terrestrial synchronization network 211 Timing extraction circuit 212 Distribution circuit 301 Input unit 302 ... Output section 303 Data transmission / reception section 304 SP synchronization control section 311 Data transmission / reception section 12 Data control unit (memory unit) 313 Data bus 314 Operation processing unit 315 Determination processing unit 401 Wide area data transmission network 402, 402A, 402B Central processing unit (CTE) 501 Central processing unit designating unit 502 Electric quantity information 503: Equipment open / close information 504: Sampling timing information

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02J 13/00 311 H02J 13/00 311R (72) Inventor Hiroshi Imamura 2-11- Iwatokita, Komae-shi, Tokyo 1 Within the Central Research Institute of Electric Power Industry (72) Inventor Masao Hori 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Michihiko Inukai 1-1-1, Shibaura, Minato-ku, Tokyo Stock (72) Inventor Jun Takeuchi 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Hidemasa Sugiura 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu Plant (72) Inventor Toshiro Kagami 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu factory of Toshiba Corporation (reference) 5G058 EE03 EH02 EH03 5G064 AA04 AC01 AC03 AC06 AC09 CB11 CB19

Claims (16)

[Claims] 1. A wide area of an electric power system in which an accident section of a power system is determined using electric quantities of a plurality of predetermined terminals of the electric power system and an interruption command is sent to a circuit breaker corresponding to the accident section to eliminate the accident. In the protection system, the input electric quantity of each terminal equipment (RTE) individually provided on a predetermined basis with respect to each terminal of the transmission line, bus division, bus connection, and each terminal of the transformer in the protection section divided by the circuit breaker. A data acquisition unit that converts the sampling timing obtained from the time synchronization signal device (STE) into digital data based on the sampling timing and transmits the data and the operation state of the system to a central processing unit (CTE); Determining means for determining an accident section and an accident condition using data of each RTE obtained by the data acquiring means; and determining based on a result of the determination by the determining means. Control information transmitting means for transmitting circuit breaker control information for controlling the circuit breaker from the CTE side to the RTE connected to the circuit breaker; and the circuit breaker control information from the control information transmitting means on the RTE side. Receiving, performing predetermined processing based on the circuit breaker control information, and, if necessary, having control information processing means for performing a control output to the circuit breaker; By performing a differential operation using the obtained current data, it has a minimum section determining function of determining the minimum fault section and fault mode divided by the circuit breaker, the control information transmitting means, the control information transmission means of the determination means When an accident section and an accident aspect are determined by the minimum section determination function, a breaking finger for causing a circuit breaker determined based on the determination result to perform a breaking operation with respect to the RTE of the accident section. Wide protection system for a power system and having a cut-off command transmission function for accidents removed to send. 2. The control information transmitting means according to claim 2, wherein said fault determining means determines that said faulty section is a reclosable power line fault. After a lapse of a predetermined time from the transmission of the preceding cutoff command, a synchronization determination function of determining whether or not synchronization between buses adjacent to the accident section can be performed. When it is determined by the synchronization determination function that synchronization can be performed between the buses, a synchronization command for transmitting a closing command for causing the predetermined circuit breaker in a blocking state to perform a closing operation with respect to the RTE in the accident section. The wide-area protection system for an electric power system according to claim 1, further comprising a power-on command transmission function. 3. The determining means has a phase difference determining function of determining a phase difference of a predetermined inter-bus voltage using the voltage data obtained by the data obtaining means. When it is determined by the phase difference determination function of the determination means that the inter-bus voltage has a change in the phase difference of 180 degrees or more, the RT of the section including the bus is determined.
2. The electric power according to claim 1, further comprising a shut-off command transmission function for step-out protection for transmitting a shut-off command for causing the circuit breaker determined based on the determination result to perform a shut-off operation. System wide area protection system. 4. The determination means according to claim 1, wherein the accident section determination by the minimum section determination function is not canceled even after transmission of a preceding shutdown command by the accident removal shutdown command transmission function of the control information transmission means. If the current time from the RTE is assumed to be 0, the differential operation of a section adjacent to the accident section is performed when the current data from the RTE has been continued for more than an hour, so that an accident section of the enlarged section including the accident section is determined. Having a determination function, the control information transmitting means, when it is determined by the expansion section determination function of the determination means that there is an accident in the expanded section, based on the determination result for the RTE of the expanded section 2. The power system according to claim 1, further comprising a cutoff command transmission function for transmitting a cutoff command for causing the determined circuit breaker to perform a cutoff operation. Protection system. 5. The method according to claim 1, wherein the determining unit uses the data obtained by the data obtaining unit to execute the RT.
E, an RTE failure determination function for determining whether or not there is a failure, and, when an RTE failure is determined by the RTE failure determination function, differential determination is performed using data of another RTE surrounding the failure RTE. An expanded section for calculating, and performing an expanded differential operation, which has an expanded section determination function of performing an accident determination of the expanded section, wherein the control information transmitting means is provided by the expanded section determination function of the determination means. When it is determined that there is an accident in the enlarged section, a cutoff for dealing with the defective RTE is transmitted to the other RTE in the enlarged section to preliminarily shut off the circuit breaker in charge of the defective RTE. A command transmission function, wherein the determination unit is configured to determine whether the defective RT of the control information transmission unit
E After a lapse of a predetermined time from the transmission of the preceding shutdown command by the shutdown command transmission function for coping with E, a differential operation of each of the minimum protection sections including the defective RTE is performed, thereby providing an RTE defective section determination function for determining an accident section. The control information transmitting means is configured to interrupt the RTE of the accident section determined by the RTE defective section determining function of the determining means by causing a circuit breaker determined based on the determination result to perform a breaking operation. The wide-area protection system for an electric power system according to claim 1, further comprising a cutoff command transmission function for transmitting a command to eliminate an RTE defective section accident. 6. The control information processing means obtains an accident detection function of detecting an accident using a system electric quantity input to the RTE, and the circuit breaker control information received from the CTE by the accident detection function. 2. The wide-area protection system for a power system according to claim 1, further comprising a control information evaluation function of performing a control output to the circuit breaker in accordance with the circuit breaker control information only when the information matches the information. 7. The RTE side converts an input electric quantity of the RTE into digital data based on a sampling timing obtained from the STE and uses the data to identify an accident direction and an accident section. A CTE failure detecting means for detecting the CTE failure and a transmission failure between the CTE and the CTE on the RTE side, wherein the control information processing means detects a CTE failure or a transmission failure by the CTE failure detecting means. 2. The wide-area power system protection system according to claim 1, further comprising a backup control output function for performing a control output to the circuit breaker determined based on an output of the identification means. 8. The data acquisition means converts the input electric quantity of each RTE into digital data based on the sampling timing obtained from the STE, and obtains the data and the operation state of the system from the STE. 2. The electric power according to claim 1, wherein a sampling time and a name of a terminal to be subjected to a differential operation are added to generate data including information on a terminal to be operated, and the data is transmitted to the plurality of CTEs. System wide area protection system. 9. The data acquisition means converts the input electric quantity of each RTE into digital data based on the sampling timing obtained from the STE, and obtains the data and the operation state of the system from the STE. A code that specifies the sampling time and a unique CTE is added to make the data including the destination specifying information.
The wide-area power system protection system according to claim 1, wherein the system is configured to transmit to the TE. 10. The data acquisition means according to claim 1, wherein
To the plurality of CTEs, and the RTE side detects a failure of the CTE.
E failure detection means, and when the CTE failure detection means detects a CTE failure, the transmission destination switching means for changing the information transmission destination of the RTE having the failure CTE as a transmission destination at that time to a sound CTE. The wide-area protection system for an electric power system according to claim 1. 11. A wide area of an electric power system in which an accident section of a power system is determined using electric quantities of a plurality of predetermined terminals of the electric power system and an interruption command is sent to a circuit breaker corresponding to the accident section to eliminate the accident. In the protection method, the input electric quantity of each terminal equipment (RTE) individually provided on a predetermined basis with respect to each terminal of the transmission line, bus division, bus connection, and each terminal of the transformer in the protection section divided by the circuit breaker. A data acquisition step of converting the data into digital data based on a sampling timing obtained from a time synchronization signal device (STE), and transmitting the data and an operation state of a system to a central processing unit (CTE); By performing a differential operation using the current data obtained in the data acquisition step, the minimum fault section divided by the circuit breaker and the minimum fault section for determining the fault condition are determined. A determination step; and, when the accident section and the accident aspect are determined by the minimum section determination step, a cut-off for causing a circuit breaker determined based on the determination result to perform a breaking operation on the RTE of the accident section. A command for transmitting a command for accident removal for transmitting a command; and a process for receiving a command for commanding from the CTE side on the RTE side, performing predetermined processing based on the command for blocking, and then blocking if necessary. And a shutoff command processing step for issuing a shutoff command to the power supply. 12. When the accident section determination by the minimum section determination step continues for a predetermined time or longer without being canceled even after transmission of the preceding shutdown command in the accident removal shutdown command transmission step, the RTE is used. An enlarged section determination step of performing an accident determination of an extended section including the accident section by performing a differential operation on a section adjacent to the accident section by regarding the current data of 0 as 0, If it is determined that there is an accident in the section, the RTE of the expanded section
2. A shut-off command transmission step for transmitting a shut-off command for causing a breaker to perform a shut-off operation determined on the basis of the determination result.
A wide-area protection method for a power system according to claim 1. 13. An RTE failure determining step of determining whether there is a failure in any of the RTEs using data obtained in the data obtaining step, and an RTE failure is determined by the RTE failure determination step. In this case, the section for differential operation is expanded by using data of another RTE surrounding the defective RTE, and an expanded differential operation is performed to determine an accident in the expanded section. When it is determined in the section determination step that there is an accident in the expanded section, the other RTE of the expanded section is determined.
In response to this, a failure command transmission step for transmitting a preliminary shutdown command for preemptively shutting off the circuit breaker that is in charge of the defective RTE, and a preliminary shutdown command transmission by the failure command transmission step for dealing with the defective RTE, After a lapse of a predetermined time, the defective RTE
By performing the differential operation of each minimum protection interval including
An RTE defective section determining step of determining an accident section; and a shutoff command for causing a circuit breaker determined based on the determination result to perform a shutoff operation with respect to the RTE of the accident section determined in the RTE defective section determining step. 12. A wide-area protection method for an electric power system according to claim 11, further comprising a step of transmitting a shutdown command for removing an accident in an RTE defective section, which transmits an error. 14. An identification step for converting an input electric quantity of the RTE into digital data based on a sampling timing obtained from the STE on the RTE side, and using the data to identify an accident direction and an accident section. A CTE failure detection step for detecting the CTE failure and a transmission failure between the CTE and the CTE on the RTE side; and when the CTE failure detection step detects a CTE failure or a transmission failure, based on an output of the identification step. 12. The wide-area protection method for a power system according to claim 11, further comprising a backup control output step of performing a control output to the circuit breaker determined by the step (c). 15. In the data acquisition step,
CT for transmitting the data of each RTE to the plurality of CTEs and detecting a defect of the CTE on the RTE side
E failure detection step, and when a CTE failure is detected by the CTE failure detection step, a transmission destination switching step of changing the information transmission destination of the RTE having the defective CTE as a transmission destination to a healthy CTE at that time. The wide-area protection method for an electric power system according to claim 11, wherein: 16. A computer for performing a fault elimination by determining an accident section of a power system using electric quantities of a plurality of predetermined terminals of the power system and transmitting a shutoff command to a circuit breaker corresponding to the accident section. In a program recording medium on which a readable program is recorded, the program is stored in a first computer in a predetermined manner with respect to each terminal of a transmission line, a bus division, a bus connection, and each terminal of a transformer in a protection section divided by a circuit breaker. The input electric quantity of each terminal equipment (RTE) provided individually on the basis is converted into digital data based on the sampling timing obtained from the time synchronization signal equipment (STE), and the data and the operation state of the system are centrally processed. A data acquisition step to be transmitted to the device (CTE); and a cutoff command from the CTE side is received, and a predetermined process is performed based on the cutoff command. After performing the above, the control unit is caused to execute a cutoff command processing step of outputting a cutoff command to the circuit breaker as necessary, and the second computer performs a differential operation using the current data obtained in the data acquisition step. By doing so, a minimum section determination step for determining the minimum accident section and the accident aspect classified by the circuit breaker, and when the accident section and the accident aspect are determined by the minimum section determination step, the RTE of the accident section is determined. On the other hand, a program recording medium characterized by causing a circuit breaker, which is determined based on the determination result, to execute an accident elimination interruption instruction transmitting step of transmitting an interruption instruction for causing the circuit breaker to perform an interruption operation.