JPH10257660A - Power system protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a tendency towards multiple terminal structure and to improve a protective function by providing software for achieving a protection system with a different power system, a means for selecting the protection system, a means for establishing the protection system from the side of hardware, and a means for protecting a power system to be protected. SOLUTION: A relay device has softwares 51 and 52 for achieving protection systems with different power systems, a means 40 for selecting a protection system that is achieved by the softwares 51 and 52, a means 41 for establishing a protection system that is selected by the protection selection means 40 from the side of the hardwares, and a means 15 for executing the softwares 51 and 52 for achieving a protection system, based on the protection system which is selected by the protection selecting means 40 and for protecting a power system to be protected, thus easily and inexpensively enabling changing the protection system of the power system from a circuit section relay protection system to a current differential protection system and easily and inexpensively coping with the change to a power system accompanying a tendency towards multiple terminals structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system protection relay device for detecting an abnormality occurring in a power transmission system to be protected and operating a circuit breaker to protect the power transmission system.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a conventional transmission line protection relay of 77 kV or less. This transmission line protection relay is described in “Standard Concept of System Protection Relay System (Digital Edition)” issued in March, 1992 by the Protection and Control Section Manager in the Engineering Department, Federation of Electric Power Companies of Japan. This is equivalent to the digital relay system shown in (1). In the drawing, reference numeral 1 denotes a transmission line of a power system to be protected, which is shown as a single line for convenience, but is actually formed of three-phase lines of A-phase, B-phase, and C-phase. Reference numeral 6 denotes a local electric station provided on one side of the transmission line 1, reference numeral 7 denotes a mating electric station provided on the other mating end of the transmission line 1 separated from the main end, and reference numeral 200 denotes a main terminal electric station. Reference numeral 300 denotes a digital relay device (hereinafter, referred to as a relay device on the other end), and a digital relay device (hereinafter, referred to as a relay device on the other end) installed in the counterpart electric station 7.

[0003] Next, the configurations of the relay device 200 on the own end side and the relay device 300 on the mating end side will be described. In addition,
FIG. 8 illustrates the configuration of the relay device 200 on the own end side, but the same configuration applies to the relay device 300 on the other end side. In the figure, 11 is an analog filter, 12 is a sample and hold circuit for holding data, 13 is a multiplexer circuit for switching input channels, 14 is an analog-to-digital converter, 15 is an arithmetic unit that performs a relay operation using input data, and 16 is an arithmetic unit. An input / output unit for outputting a trip command, 21 is a current transformer for measuring current, 25 is a voltage transformer for measuring bus voltage, 3
Reference numeral 0 denotes a self-end breaker for cutting off the transmission line 1, 22 denotes a current transformer of the mating end relay device 300, 26 denotes a voltage transformer of the mating end side relay device 300, and 31 denotes a mating end breaker. is there.

[0004] The relay device 200 on the self-end side and the relay device 300 on the mating end side use the current transformers 21 and 22, the voltage transformers 25 and 25, respectively, to measure the current and voltage of the transmission line 1 of the power system.
26, the DC component and harmonic components are removed by the analog filter 11, the fundamental wave is held in the sample-and-hold circuit 12 at regular intervals, and the channel of the multiplexer 13 is sequentially switched to convert the analog amount into an analog-digital conversion circuit. At 14, it is arranged in a form that can be digitally operated. The arithmetic unit 15 performs a relay operation according to the basic principle described below, determines an internal accident, and outputs a trip command to the input / output unit 1.
6, the power transmission line 1 is cut off and protected by the own-end breaker 30 and the mating-end breaker 31.

[0005] The relay system, which is the basic principle of this transmission line protection relay device, is shown in, for example, P164 to P167 of "Protection Relay Engineering" issued by the Institute of Electrical Engineers of Japan in 1981. Since this relay system does not require signal transmission between substations, it is widely used as protection for transmission lines of 77 kV to 66 kV class. However, in principle, in the case of an accident near each substation, a relay device near the accident point is used. This relay operates first, and then the relay device at the other end operates, so that this relay system may have a prolonged accident elimination time.

In recent years, the construction of transmission lines has tended to be multi-terminals such as three terminals and four terminals due to problems such as difficulty in securing land and environmental protection, and the performance and reliability of the protective relay system have been strongly improved. Has been requested. Therefore, a current differential protection system is applied to solve problems such as charging current in a section in a multi-terminal system, an internal accident due to an outflow, and a flow of power at the time of an accident.

Hereinafter, the current differential protection system will be described by taking a multi-terminal transmission line protection system by optical fiber transmission shown in "Mitsubishi Electric Technical Report, vo162, No. 10" issued in 1988 as an example. FIG. 9 is a system configuration diagram when the multi-terminal transmission line protection system is applied to a four-terminal system. In FIG. 9, the same or corresponding parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 17 is a serial / parallel converter, 18 is an optical / electrical converter,
19 is a parallel / serial converter, and 20 is an electric / optical converter.

The multi-terminal transmission line protection system includes a master relay device 400 for performing a relay operation and a master relay device 40.
The relay device 50 that transmits current information to the slave relay device 0 and that trips the mating breakers 31 to 33 on the slave relay device side in response to a transfer cutoff command from the master relay device 400.
0, slave terminal relay device 600, slave terminal relay device 700,
The main relay device 400 and the slave relay device 500, the slave relay device 600, and the optical fiber 10 connecting the slave relay device 700 are configured. The master relay device 400, the slave relay device 500, and the slave relay device 6
The hardware of 00 and the slave relay device 700 has the same configuration.

Next, the operation of the multi-terminal transmission line protection system will be described. In this multi-terminal transmission line protection system, a single-core optical fiber is provided between the parent relay device 400, the child relay device 500, the child relay device 600, and the child relay device 700 installed at each end of the transmission line. The current information at each end is transmitted in a time-division serial manner via this optical fiber 10. First, an empty data frame in which current data is not written is transmitted from the parent relay device 400 to the child relay device 500. In the slave end relay device 500, the received signal is optically / electrically converted by the optical / electrical converter 18, and the converted signal is serial-to-parallel converted by the serial / parallel converter 17,
The current data captured by the current transformer 22 is written into the frame F1 for the slave relay device 500 in the data frame, and the parallel-to-serial converter 19 performs parallel-to-serial conversion. Perform light conversion,
This data frame is transferred to slave terminal relay device 700.

Hereinafter, the same operation is performed in the slave relay device 600 and the slave relay device 700. In the slave relay device 600, the slave relay device 60 in the data frame is used.
The current data fetched by the current transformer is written into the frame F2 for 0, and in the slave relay device 700, the current data fetched by the current transformer is written into the frame F3 for the slave relay device 700 in the data frame. The data frame in which the current data of the terminal is written is transmitted to the master relay device 400. Master relay device 40
The zero arithmetic unit 15 performs a current differential operation using the child-end current information and the self-end current information. Then, when it is determined that the internal failure has occurred according to the calculation result, the master relay device 40
A value of 0 causes the own-end circuit breaker 30 to operate, and at the same time, writes data for transfer interruption into the parent-end relay device frame in the data frame, thereby operating the other-end breakers 31 to 33.

As described above, in each relay device, only the operation of the arithmetic processing unit is different, and the basic system configuration of the hardware is a serial / parallel converter 17, an optical / electrical converter 18, a parallel / serial converter. 19. Electric / optical converter 20
The configuration is almost the same except for.

[0012]

Since the conventional transmission line protection relay device is configured as described above, the power system in which the relay device is installed is changed due to a change in the number of terminals and the like, and the protection system is changed. If it becomes necessary to replace the existing relay device, the existing relay device is relocated or discarded, and a new relay device is installed. Therefore, there is a problem that the cost is increased and the PCM cannot be easily realized.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an electric power system protection relay device which can cope with an increase in the number of terminals without incurring a high cost and which can realize an upgraded protection function. The purpose is to gain.

[0014]

According to a first aspect of the present invention, there is provided an electric power system protection relay device which implements different protection systems of different electric power systems for a relay device on its own end and a relay device on a partner end. Software, protection scheme selection means for selecting the protection scheme realized by the software, hardware establishment means for establishing the protection scheme selected by the protection scheme selection means from a hardware aspect, A protection means for executing software for realizing the protection method based on the protection method selected by the method selection means and protecting the power system to be protected is provided.

According to a second aspect of the present invention, in the power system protection relay device, the hardware establishing means sets the power system protection method to the current differential protection method selected by the protection method selection means from a hardware aspect. Hardware protection means for enabling additional hardware to be established, wherein the protection means executes software for implementing the protection scheme when the current differential protection scheme is selected by the protection scheme selection means. Further, the power system to be protected is protected by using the hardware added by the hardware adding means.

According to a third aspect of the present invention, there is provided a power system protection relay device, comprising: a communication path for connecting a relay device on its own end and a relay device on the other end of a power system to be protected in a loop. And a hardware extension means for enabling extension of an interface circuit for transmitting and receiving data for establishing the power system protection method to the current differential protection method via the communication path. .

According to a fourth aspect of the present invention, there is provided a power system protection relay device, comprising: a condition terminal for setting a selection condition for setting selection of a line selection relay protection system or a current differential protection system from an external device. The protection system selection means is provided on the base.

According to a fifth aspect of the present invention, there is provided a power system protection relay device, wherein a predetermined condition of a condition terminal block is short-circuited to externally set a selection condition of a line selection relay protection system or a current differential protection system. A protection method selecting means for setting is provided.

According to a sixth aspect of the present invention, there is provided a power system protection relay device, comprising: a control C for controlling a set protection method;
The protection means includes a PU card, and the protection method selection means sets one of the line selection relay protection method and the current differential protection method based on the selection conditions sent from the general CPU card. Things.

According to the seventh aspect of the present invention, at the time of turning on the power or in the initial setting processing, the selection condition set on the condition terminal block or the selection condition sent from the general CPU card is used. Read, select either the line selection relay protection method or the current differential protection method based on the selection conditions, and after the power-on or after the initial setting process, at the power-on or in the initial setting process A protection method selecting means for selecting either the line selection relay protection method or the current differential protection method based on the read selection condition is provided.

According to an eighth aspect of the present invention, there is provided a power system protection relay device, wherein a condition setting for setting a selection condition for setting a selection of a line selection relay protection system or a current differential protection system to be externally changeable. A protection system selection means, and a general CPU card for controlling the protection system selected and set by the condition setting switch, and a power to be protected by executing software for realizing the protection system. The protection means includes an operation CPU card for protecting the system.

According to a ninth aspect of the present invention, in the power system protection relay device, a condition setting switch is provided in the general CPU card.

According to a tenth aspect of the present invention, in the power system protection relay device, a condition setting switch is provided on the arithmetic CPU card.

According to the eleventh aspect of the present invention, at the time of power-on or in the initial setting processing,
The selection condition set by the condition setting switch is read, and either the line selection relay protection method or the current differential protection method is selected based on the selection condition, and when the power is turned on or after the initial setting processing, In the above, there is provided a protection method selecting means for selecting either the line selection relay protection method or the current differential protection method based on the selection conditions read at the time of power-on or in the initial setting processing. is there.

According to a twelfth aspect of the present invention, there is provided the power system protection relay device according to the first aspect of the present invention, wherein an abnormality of the arithmetic CPU card or a mismatch between the selection conditions respectively set in the condition setting switches provided in the arithmetic CPU card and the general CPU card. And a monitoring means for monitoring the

According to a thirteenth aspect of the present invention, in the power system protection relay device, after transmitting predetermined pattern data from the centralized CPU card to the operation CPU card, the operation CPU
By comparing the selection conditions set in the arithmetic CPU card and the selection conditions set in the general CPU card, which are sent by being added to the predetermined pattern data by the card, in the general CPU card, There is provided a monitoring means for monitoring a mismatch of the selection condition set in each of the arithmetic CPU card and the general CPU card.

According to a fourteenth aspect of the present invention, in the power system protection relay device, after transmitting predetermined pattern data from the general CPU card to the arithmetic CPU card, the arithmetic CPU
There is provided monitoring means for monitoring an abnormality of the arithmetic CPU card based on whether or not a selection condition set in the card is added to the predetermined pattern data and sent from the arithmetic CPU card within a predetermined time. It was done.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a relay device of the power system protection relay device according to the first embodiment of the present invention. The power system to be protected by the power system protection relay device is, for example, as shown in FIG. This is a case where the power system shown in FIG. 1 has been changed to the power system shown in FIG. 9 and the need to cope with the increase in the number of terminals has arisen. The relay device shown in FIG.
Are installed at each end of the transmission line of the modified power system to be protected as shown in (1). Also, the arrangement of the current transformer, the voltage transformer, and the circuit breaker of each relay device was the same as that of FIG. 8, but with the increase in the number of terminals, the current transformer, voltage transformer, and circuit breaker of FIG. Changed to the configuration. FIG. 1 shows a relay device 2a.
Is illustrated, but the same applies to other relay devices installed at each end of the transmission line of the power system to be protected after the change. In the figure, 11 is an analog filter,
12 is a sample and hold circuit for holding data, 13 is a multiplexer circuit for switching input channels, 14 is an analog / digital conversion circuit, 15 is an arithmetic unit (protection means) that performs a relay operation using input data, and 16 is a trip command. An input / output unit for outputting, 51 is software for realizing the line selection relay protection system, and 52 is software for realizing the current differential protection system.

Numeral 40 designates a condition terminal block (protection method selecting means) whose setting can be changed from the outside.
Is read into the arithmetic unit 15 via the input / output unit 16. In this case, for example, when the connection between the terminal a and the terminal P of the conditional terminal block 40 is connected, the line selection relay system is used, and when the connection between the terminal b and the terminal P is connected, the current differential relay system is called. In accordance with the predetermined selection conditions, a plurality of installed software 51, 52
The software that implements the protection scheme set from is selected. 41 is a hardware establishing means,
The optical / electrical converter 18 and the serial / parallel converter 1 shown in FIG.
7, a socket for a board for additional hardware such as a parallel / serial converter 19, an electric / optical converter 20, and a connector for connecting a communication path by an optical fiber for connecting each relay device in a loop.

The relay device 2a takes in the current and voltage of the transmission line 1 of the power system shown in FIG. 9 through the current transformer and the voltage transformer, respectively,
1 removes the DC component and harmonic components, holds the fundamental wave in the sample and hold circuit 12 at regular intervals,
3 channels are switched in sequence to change the analog amount
The digital conversion circuit 14 prepares a digital operation. Then, a relay operation is performed by the software 51 of the arithmetic unit 15 according to a basic principle described below, an internal accident is determined, a trip command is output from the input / output unit 16, and the power transmission line 1 is interrupted and protected by the circuit breakers 30, 31. Things.

FIG. 2 is a flowchart showing the operation of the arithmetic unit 15 of the relay device 2a in the power system protection relay device according to the first embodiment. At power-on or initial setting, the process starts from step ST101, and otherwise starts from step ST102. First, at the time of power-on or initial setting, in step ST103, the selection condition is recognized by reading the selection condition from the condition terminal block 40 or receiving the selection condition from a general CPU card (not shown). Next, the selection condition recognized in step ST104 is stored in, for example, a memory. The processing up to this point is a processing step executed only when the power is turned on or at the time of initial setting.

On the other hand, in the normal state, the process starts from step ST102.
Based on the selection condition held in 104, the user selects which protection method of relay operation is to be performed, and if the line selection protection relay method is selected, executes step ST106;
If the current differential protection method has been selected, step ST107 is executed.

When the current differential protection system is selected, the optical / electrical converter 18, serial / parallel converter 17, parallel / serial converter 19, and electrical / optical converter 2 shown in FIG.
It is necessary that hardware such as “0” be added to each relay device, and that a communication path by an optical fiber connecting each relay device in a loop be laid.

As described above, when the power system to be protected is changed to the one shown in FIG. 9 with the increase in the number of terminals, the optical / electrical converter 18, the serial / parallel converter 17, the parallel / parallel converter 17, The hardware such as the serial converter 19 and the electric / optical converter 20, the addition of the communication path, and the condition terminal block 40 whose setting can be changed from the outside can be easily changed to the current differential protection method, and the protection function can be improved. .

Therefore, according to the first embodiment, the protection system of the power system can be easily and inexpensively changed from the line selection relay protection system to the current differential protection system. There is an effect that an electric power system protection relay device that can be easily and inexpensively handled, suppresses a high cost, and improves a protection function can be obtained.

Embodiment 2 FIG. 3 is a block diagram illustrating a configuration of a relay device of the power system protection relay device according to the second embodiment of the present invention. The power system to be protected by the power system protection relay device is also illustrated in FIG. The power system shown is changed to the power system shown in FIG. 9 with the increase in the number of terminals. The relay device shown in FIG. 3 is installed at each end of the transmission line of the power system to be protected after the change. The arrangement of the current transformer, voltage transformer, and circuit breaker of each relay device is the same as that in FIG. Although FIG. 3 illustrates the configuration of the relay device 2b, other relay devices installed at each end of the transmission line of the power system to be protected after the change have the same configuration. 3, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. 1 in the figure
5a is the overall CPU card (protection means), 15b is the operation C
PU card (protection means), SW1 is the central CPU card 1
This is a condition setting switch (protection method selection means) provided in 5a.

Next, the operation will be described. In the power system protection relay according to the second embodiment, the central CPU card 1
The selection condition set by the condition setting switch SW1 provided by, for example, a dip switch provided in 5a is read into the internal memory, and, for example, the condition setting switch S
When W1 is switched to the a side, it is selected by the operation CPU card 15b in accordance with a predetermined condition, such as the line selection relay protection system, and when it is switched to the b side, the current differential relay protection system. Submit the condition. Based on the selection conditions, the arithmetic CPU card 15b selects and executes software according to the selection conditions from among a plurality of pre-installed softwares 51 and 52, for example, as shown in the flowchart of FIG. The protection system selected by the condition setting switch SW1 is realized.

In this case, the condition setting switch SW1
When the current differential relay protection method is selected, the optical / electrical converter 18, the serial / parallel converter 17 shown in FIG.
Hardware such as the parallel / serial converter 19 and the electric / optical converter 20 must be added to each relay device, and a communication path using an optical fiber that connects each relay device in a loop needs to be laid.

Accordingly, the optical / electrical converter 18, the serial / parallel converter 17, the parallel / serial converter 19, and the electrical / optical converter 2
0 and the addition and control of a communication path by an optical fiber 10 for connecting each relay device in a loop.
Condition setting switch SW1 provided in PU card 15a
The current differential relay protection method can be realized in accordance with the power system shown in FIG. 9 easily changed by the setting change, and the protection function can be improved.

As described above, according to the power system protection relay device of the second embodiment, the protection system of the power system can be changed from the line selection relay protection system to the current differential protection system, and the number of terminals can be increased. There is an effect that a power system protection relay device that can easily and inexpensively cope with the accompanying change of the power system, suppress a rise in cost, and improve the protection function.

Embodiment 3 FIG. 4 is a block diagram illustrating a configuration of a relay device of a power system protection relay device according to Embodiment 3 of the present invention. The power system to be protected by the power system protection relay device is also illustrated in FIG. The power system shown is changed to the power system shown in FIG. 9 with the increase in the number of terminals. The relay device shown in FIG. 4 is installed at each end of the transmission line of the power system to be protected after the change. The arrangement of the current transformer, voltage transformer, and circuit breaker of each relay device is the same as that in FIG. Although FIG. 4 illustrates the configuration of the relay device 2c, other relay devices installed at each end of the transmission line of the power system to be protected after the change have the same configuration. 4, the same or corresponding parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, SW2
Is a condition setting switch (protection method selecting means) provided in the arithmetic CPU card 15b.

Next, the operation will be described. In the power system protection relay device of the third embodiment, the operation CPU card 1
5b, the selection condition set in the condition setting switch SW2 such as a dip switch is read into the internal memory. For example, when the condition setting switch SW2 is switched to the a side, the line selection relay protection method is used. , B side, the current differential relay protection method is followed by a predetermined condition, and based on this selection condition, for example, a plurality of components implemented according to the flowchart shown in FIG. This is to select a protection method set from the software 51, 52.

In this case, the condition setting switch SW2
When the current differential relay protection system is selected, the optical-to-electrical converter 18, the serial-to-parallel converter 17, the parallel-to-serial converter 19, and the electrical-optical converter 20 as shown in FIG. It is necessary that the ware be added to each relay device and that a communication path by an optical fiber connecting the relay devices in a loop be laid.

Accordingly, the optical / electrical converter 18, the serial / parallel converter 17, the parallel / serial converter 19, and the electrical / optical converter 2
0 and the addition of a communication path by an optical fiber 10 for connecting each relay device in a loop and calculation C
Condition setting switch SW2 provided in PU card 15b
By changing the setting, it is possible to easily cope with the changed power system and improve the protection function.

As described above, the third embodiment
According to the power system protection relay device, even if the power system to be protected is changed due to the increase in the number of terminals, the power system is protected from the line selection relay protection system to the current differential protection system. It is possible to obtain a power system protection relay device capable of changing the system, easily and inexpensively coping with the change of the power system due to the increase in the number of terminals, suppressing the increase in cost, and improving the protection function.

Embodiment 4 FIG. FIG. 5 is a block diagram showing a configuration of a relay device of a power system protection relay device according to Embodiment 4 of the present invention. The power system to be protected by this power system protection relay device is also shown in FIG. The power system shown is changed to the power system shown in FIG. 9 with the increase in the number of terminals. The relay device shown in FIG. 5 is installed at each end of the transmission line of the power system to be protected after the change. Also, the current transformer, voltage transformer, and circuit breaker of each relay device are arranged and configured in the same manner as in FIG. Although FIG. 5 illustrates the configuration of the relay device 2d, the other relay devices installed at each end of the transmission line of the power system to be protected after the change have the same configuration. 5, parts that are the same as or correspond to those in FIG. 3 are given the same reference numerals, and descriptions thereof will be omitted. In the figure, reference numeral 53 denotes an operation C after transmitting predetermined pattern data from the central CPU card 15a to the operation CPU card 15b.
In the central CPU card 15a, a selection condition set in the arithmetic CPU card 15b and a selection condition set in the central CPU card 15a sent by being added to the predetermined pattern data by the PU card 15b are compared. By doing so, it is a monitoring means provided in the centralized CPU card 15a for monitoring a mismatch between the selection conditions set in the arithmetic CPU card 15b and the centralized CPU card 15a.

Next, the operation will be described. FIG. 7 shows a relay device 2d of the power system protection relay device of the fourth embodiment.
9 is a flowchart showing the operation of the calculation CPU card 15b. FIG. 6 shows the monitoring means 53 of the centralized CPU card 15a.
6 is a flowchart showing a monitoring operation by the computer. Supervising CP
The U card 15a reads and holds the selection conditions from the condition setting switch SW1 at the time of power-on and initial setting. The arithmetic CPU card 15b also reads and holds the selection condition from the condition setting switch SW2 at power-on and at the time of initial setting. Then, the supervisory CPU card 15a transmits constant pattern data to the arithmetic CPU card 15b at regular intervals. In step ST108 or step ST109 shown in FIG. 7, the arithmetic CPU card 15b having received the constant pattern data returns the received constant pattern data with the setting conditions held at the time of the initial setting.
The transmitted fixed pattern data to which the setting condition has been added is received by the central CPU card 15a, and the monitoring means 53
If the setting conditions match, the fixed pattern data is transmitted to the arithmetic CPU card 15b again after a certain period of time. On the other hand, if the selection conditions do not match, the overall CPU card 15a outputs an external alarm from the input / output unit 16.

After transmitting the fixed pattern data, the general CPU card 15a adds the selection condition set in the calculation CPU card 15b to the fixed pattern data and transmits the selected pattern data from the calculation CPU card 15b within a predetermined time. If not, it is determined that the arithmetic CPU card 15b is abnormal.

Also in the fourth embodiment, since the current differential relay protection system is selected by the condition setting switch SW2, it is easy to change from the power system of FIG. 8 to the power system of FIG. Can respond. Incidentally, also in the fourth embodiment, the optical / electrical converter 18, the serial / parallel converter 17,
Hardware such as the parallel / serial converter 19 and the electric / optical converter 20 must be added to each relay device, and a communication path using an optical fiber that connects each relay device in a loop needs to be laid.

Therefore, the optical / electrical converter 18, the serial / parallel converter 17, the parallel / serial converter 19, and the electrical / optical converter 2
0 and the addition of a communication path by an optical fiber 10 for connecting each relay device in a loop and calculation C
Condition setting switch SW2 provided in PU card 15b
By changing the setting, it is possible to easily and inexpensively cope with the change of the power system due to the increase in the number of terminals, and it is possible to suppress the increase in cost and improve the protection function.

As described above, the fourth embodiment
According to the power system protection relay device of the above, the protection system of the power system can be changed from the line selection relay protection system to the current differential protection system at a low cost, and it is easy to change the power system due to the increase in the number of terminals. Not only can the protection function be improved at low cost, but also the monitoring means 53 can monitor whether the arithmetic CPU card 15b is functioning normally, and a highly reliable power system protection relay can be obtained. effective.

Further, even if different selection conditions are set between the condition setting switch SW1 of the general CPU card 15a and the condition setting switch SW2 of the operation CPU card 15b, an alarm can be issued to the outside. There is an effect that a highly reliable power system protection relay can be obtained.

[0053]

As described above, according to the first aspect of the present invention, there are provided software for implementing protection schemes of different power systems, and protection scheme selection means for selecting the protection scheme implemented by the software. Hardware establishment means for establishing the protection scheme selected by the protection scheme selection means from a hardware aspect, and software for implementing the protection scheme based on the protection scheme selected by the protection scheme selection means. Since the relay device is provided with a protection unit that executes and protects the power system to be protected, for example, with the increase in the number of terminals of the power system, the power is switched from the line selection relay protection system to the current differential protection system. Even if it is necessary to change the protection method of the system, the relay device that had been compatible with the line selection relay protection method until now has been changed to the current differential protection method. It is possible to easily and inexpensively change to a relay device, easily and inexpensively respond to the change of the power system due to the increase in the number of terminals, and obtain an effect of obtaining a power system protection relay device that can suppress the cost increase and improve the protection function. .

According to the second aspect of the present invention, it is possible to add hardware for establishing a power system protection system from a hardware aspect in the current differential protection system selected by the protection system selection means. When the current differential protection method is selected by the hardware addition means and the protection method selection means, software for implementing the protection method is executed, and the hardware added by the hardware addition means is used to execute the software. Since the protection system for protecting the power system to be protected is provided, the protection system of the power system is changed from the line selection relay protection system to the current differential protection system as the number of terminals of the power system increases. Even if it becomes necessary, a relay device that previously supported the line selection relay protection method can be easily and inexpensively changed to a relay device that supports the current differential protection method. Can, can cope easily and inexpensively to change of the power system with the number of terminals, there is an effect that the electric power system protective relay device is obtained which can enhance the protection provided by suppressing the cost.

According to the third aspect of the present invention, a communication path for connecting a relay device on the self-end side and a relay device on the other end of the power system to be protected in a loop, and a current differential protection. The system is configured so as to include a hardware extension unit that allows an extension of an interface circuit that exchanges data for establishing a power system protection system via the communication path. Therefore, even if it is necessary to change the protection method of the power system from the line selection relay protection method to the current differential protection method, the relay device that previously supported the line selection relay protection method was changed to the current differential protection method. The hardware can be easily and inexpensively changed by using the hardware expansion means to the corresponding relay device, and the change of the power system accompanying the increase in the number of terminals can be easily and inexpensively handled, and the cost increases. An effect of suppressing the electric power system protective relay device capable of improving the protection function can be obtained.

According to the fourth aspect of the present invention, there is provided a condition terminal block for setting selection conditions for setting the selection of the line selection relay protection system or the current differential protection system to be changeable from outside. Therefore, even if it becomes necessary to change the protection method of the power system from the line selection relay protection method to the current differential protection method due to the increase in the number of terminals in the power system, the line selection relay protection method must be supported. Was changed to a relay device compatible with the current differential protection system, by changing the selection conditions set by the condition terminal block, it can be easily and inexpensively changed, and it is easy to change the power system with multi-terminals. There is an effect that a power system protection relay device that can be inexpensively used, suppresses cost increases, and improves a protection function can be obtained.

According to the fifth aspect of the present invention, the selection condition of the line selection relay protection system or the current differential protection system is externally set by short-circuiting predetermined terminals of the condition terminal block. Therefore, even if it becomes necessary to change the protection method of the power system from the line selection relay protection method to the current differential protection method due to the increase in the number of terminals in the power system, the system still supports the line selection relay protection method. The relay device can be easily and inexpensively changed to a relay device compatible with the current differential protection system by changing the short-circuit state between the terminals in the condition terminal block, and easily and inexpensively to change the power system due to the increase in the number of terminals. In addition, there is an effect that a power system protection relay device capable of suppressing the increase in cost and improving the protection function can be obtained.

According to the sixth aspect of the present invention, the central CPU
It is configured to set either the line selection relay protection method or the current differential protection method based on the selection conditions sent from the card, so it depends on the selection conditions sent from the general CPU card. Also, there is an effect that any one of the protection methods of the line selection relay protection method and the current differential protection method can be set.

According to the seventh aspect of the present invention, at power-on or in the initial setting process, the selection condition set in the condition terminal block or the selection condition sent from the general CPU card is read, and the selected condition is read. Originally, either the line selection relay protection method or the current differential protection method is selected, and after the power is turned on or after the initial setting process, the selection condition read at the power on or in the initial setting process is used. Originally, it was configured to select either the line-selection relay protection method or the current differential protection method.As the number of terminals in the power system increased, the power was switched from the line-selection relay protection method to the current differential protection method. Even if it becomes necessary to change the protection method of the power system, the relay device that had been compatible with the line selective relay protection method was transferred to the relay device that was compatible with the current differential protection method. The power supply system can be changed easily and inexpensively by reading the selection conditions set in the condition terminal block or the selection conditions sent from the general CPU card at the time of turning on or in the initial setting process, and changing the power system due to the increase in the number of terminals. The present invention has an effect of obtaining a power system protection relay device that can easily and inexpensively cope with the above problem, suppress the cost increase, and improve the protection function.

According to the eighth aspect of the present invention, a condition setting switch for setting a selection condition for setting the selection of the line selection relay protection method or the current differential protection method to be changeable from outside, and the condition setting switch A control CPU card for controlling the protection method selected and set by the setting switch, and a calculation CPU card for executing software for implementing the protection method and protecting the power system to be protected. Therefore, even if it becomes necessary to change the protection method of the power system from the line selection relay protection method to the current differential protection method due to the increase in the number of terminals in the power system, the line selection relay protection method must be supported. The existing relay device can be easily and inexpensively changed to a relay device compatible with the current differential protection method depending on the state of the condition setting switch. There are easy and inexpensive to correspond, the effect of the electric power system protective relay device is obtained which can enhance the protection provided by suppressing the high cost.

According to the ninth aspect of the present invention, the condition setting switch is provided in the centralized CPU card, so that the line selection relay protection system is switched to the current differential protection system as the number of terminals of the power system increases. Even if it becomes necessary to change the protection method of the power system, the relay device that had been compatible with the line selection relay protection method until now was replaced with a relay device that was compatible with the current differential protection method, and was provided in the general CPU card. Can be easily and inexpensively changed depending on the state of the condition setting switch,
There is an effect that a power system protection relay device that can easily and inexpensively cope with a change in the power system due to the increase in the number of terminals and that can suppress the cost increase and improve the protection function can be obtained.

According to the tenth aspect of the present invention, since the condition setting switch is provided in the arithmetic CPU card, the line selection relay protection system is switched to the current differential protection system in accordance with an increase in the number of terminals of the power system. Even if it becomes necessary to change the protection system of the power system, the relay CPU that had been compatible with the line selection relay protection system up to the relay device that was compatible with the current differential protection system was provided in the arithmetic CPU card. Power system protection relay device which can be easily and inexpensively changed depending on the state of the condition setting switch, which can easily and inexpensively cope with a change in the power system due to the increase in the number of terminals, and which can suppress the cost increase and improve the protection function. The effect is obtained.

According to the eleventh aspect of the present invention, at the time of power-on or in the initial setting process, the selection condition set by the condition setting switch is read, and the line selection relay protection system or After selecting one of the current differential protection methods, after the power is turned on or after the initial setting processing, the line selection relay protection method or based on the selection condition read at the power on or in the initial setting processing or Since it was configured to select either of the current differential protection methods, it became necessary to change the protection method of the power system from the line selection relay protection method to the current differential protection method as the number of terminals in the power system increased. However, when a power supply is turned on or during initial setting processing, a relay device that has been compatible with the line selection A power system protection relay device that can be easily and inexpensively changed according to the state of the condition setting switch, can easily and inexpensively cope with a change in the power system due to the increase in the number of terminals, and can suppress the cost increase and improve the protection function. There is an effect that can be obtained.

According to the twelfth aspect of the present invention, the operation CP
It is configured to include monitoring means for monitoring the U card for abnormalities and the inconsistency of the selection conditions set in the condition setting switches provided in the arithmetic CPU card and the general CPU card. Even if the selected selection condition does not match the selection condition set in the arithmetic CPU card, an alarm can be issued to the outside, and the monitoring means determines whether the arithmetic CPU card is functioning normally. Monitoring can be performed, and there is an effect that a highly reliable power system protection relay can be obtained.

According to the thirteenth aspect of the present invention, the general CP
After transmitting predetermined pattern data from the U card to the operation CPU card, the operation C transmitted by being added to the predetermined pattern data by the operation CPU card is transmitted.
Selection conditions set in the PU card and the general CPU
By comparing the selection condition set on the card with the general CPU card, the monitoring unit monitors the mismatch of the selection condition set on the arithmetic CPU card and the general CPU card. Even if the selection condition set in the central CPU card does not match the selection condition set in the arithmetic CPU card, an alarm can be issued to the outside, so that a highly reliable power system protection relay device can be provided. There is an effect that can be obtained.

According to the fourteenth aspect of the present invention, the general CP
After transmitting the predetermined pattern data from the U card to the operation CPU card, the selection condition set in the operation CPU card is added to the predetermined pattern data and sent from the operation CPU card within a predetermined time. Since the monitoring means is configured to monitor the abnormality of the arithmetic CPU card depending on whether it comes or not, the monitoring means can monitor whether the arithmetic CPU card is functioning normally or not. Therefore, there is an effect that a power system protection relay device having a high power consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a relay device of a power system protection relay device according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart showing the operation of the arithmetic unit of the relay device in the power system protection relay device of the first embodiment.

FIG. 3 is a block diagram showing a configuration of a relay device of a power system protection relay device according to Embodiment 2 of the present invention.

FIG. 4 is a block diagram showing a configuration of a relay device of a power system protection relay device according to Embodiment 3 of the present invention.

FIG. 5 is a block diagram showing a configuration of a relay device of a power system protection relay device according to Embodiment 4 of the present invention.

FIG. 6 is a flowchart illustrating a monitoring operation by a monitoring unit of an overall CPU card in a relay device of a power system protection relay device according to Embodiment 4 of the present invention;

FIG. 7 is a flowchart showing an operation of a calculation CPU card of the relay device of the power system protection relay device according to Embodiment 4 of the present invention.

FIG. 8 is a configuration diagram showing a conventional transmission line protection relay device using a line selection relay protection method.

FIG. 9 is a system configuration diagram showing a conventional power system protection relay device when a multi-terminal transmission line protection system based on a current differential protection method is applied to a four-terminal system.

[Explanation of symbols]

2a, 2b, 2c, 2d Relay device, 15 arithmetic means (protection means), 15a general CPU card (protection means), 15b arithmetic CPU card (protection means), SW
1, SW2 condition setting switch (protection method selection means), 40 condition terminal block (protection method selection means), 41
Hardware establishment means, 51, 52 software, 5
3 Monitoring means.

Claims (14)

[Claims] An accident in a power system to be protected is detected, and a relay system of the power system is turned off by a relay device on a self-end side and a relay device on a counterpart end of the power system to shut off the power system. In the power system protection relay device to be protected, the relay device on the self-end side and the relay device on the other end side each select software that realizes a different protection system of the power system, and select the protection system that is realized by the software. Protection method selecting means to perform, a hardware establishing means for establishing the protection method selected by the protection method selecting means from a hardware aspect, and a protection method based on the protection method selected by the protection method selecting means. Protection means for executing software realizing the system and protecting the power system to be protected. Protective relay device. 2. The different protection schemes of the power system are a line selection relay protection scheme and a current differential protection scheme, and the hardware establishing means is adapted to the current differential protection scheme selected by the protection scheme selection means. A hardware extension unit that enables additional hardware to establish the protection system of the power system from a hardware aspect, wherein the protection unit is selected from the current differential protection system by the protection system selection unit. 2. The power supply according to claim 1, wherein when the power supply is performed, software that realizes the protection method is executed, and the power system to be protected is protected by using the hardware added by the hardware addition unit. Grid protection relay. 3. The hardware expansion means includes: a communication path that connects a relay device on the self-end side and a relay device on the other end of the power system to be protected in a loop; and a current differential protection system. 3. The power system protection relay device according to claim 2, wherein an interface circuit for transmitting and receiving data for establishing the power system protection method via the communication path can be added. 4. The protection system selection means includes a condition terminal block for setting selection conditions for setting selection of a line selection relay protection system or a current differential protection system from an external device. The power system protection relay device according to claim 2 or 3, wherein: 5. The protection system selection means externally sets a selection condition of a line selection relay protection system or a current differential protection system by short-circuiting predetermined terminals of a condition terminal block. Item 4. The power system protection relay device according to Item 4. 6. The protection means includes a general CPU card for supervising a set protection method, and the protection method selection means includes a line selection relay protection based on a selection condition sent from the general CPU card. The power system protection relay device according to claim 4, wherein the power system protection relay device is set to one of a system and a current differential protection system. 7. The protection method selection means reads the selection conditions set on the condition terminal block or the selection conditions sent from the general CPU card at the time of power-on or in initial setting processing, and based on the selection conditions. After selecting the line selection relay protection method or the current differential protection method, after the power is turned on or after the initial setting process, based on the selection condition read at the time of power turning on or in the initial setting process. 7. The power system protection relay device according to claim 6, wherein one of a line selection relay protection system and a current differential protection system is selected. 8. The protection method selection means has a condition setting switch for setting selection conditions for setting selection of a line selection relay protection method or a current differential protection method from outside. A control CPU card for controlling a protection method selected and set by the condition setting switch, and a calculation CPU card for executing software for realizing the protection method and protecting the power system to be protected. The power system protection relay device according to claim 2 or 3, wherein 9. The power system protection relay device according to claim 8, wherein the condition setting switch is provided in the general CPU card. 10. The power system protection relay device according to claim 8, wherein the condition setting switch is provided on the arithmetic CPU card. 11. A protection method selection means reads a selection condition set by a condition setting switch at power-on or in an initial setting process, and based on the selection condition, selects a line selection relay protection method or a current difference. When the power is turned on or after the initial setting process, the line selection relay protection method or the current difference is selected based on the selection condition read at the time of power turning on or the initial setting process. The power system protection relay device according to any one of claims 8 to 10, wherein one of dynamic protection systems is selected. 12. An abnormality in an operation CPU card or an operation CPU
12. The power system protection relay according to claim 10, further comprising monitoring means for monitoring a mismatch between selection conditions set in respective condition setting switches provided on the card and the integrated CPU card. Electrical equipment. 13. The monitoring means, after transmitting predetermined pattern data from the centralized CPU card to the operation CPU card, sets the predetermined pattern data in the operation CPU card which is added to the predetermined pattern data and transmitted by the operation CPU card. By comparing the selected selection condition and the selection condition set in the general CPU card in the general CPU card, the discrepancy between the selection conditions set in the arithmetic CPU card and the general CPU card is monitored. The power system protection relay device according to claim 12, wherein: 14. The monitoring means, after transmitting predetermined pattern data from the centralized CPU card to the operation CPU card, adds a selection condition set in the operation CPU card to the predetermined pattern data, and
13. The power system protection relay device according to claim 12, wherein an abnormality of the operation CPU card is monitored according to whether or not the operation CPU card is sent from the card within a predetermined time.