JP3452751B2 - Power system protection relay - Google Patents

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 device of 77 kV or less. This transmission line protection relay device is based on P15-P27 of "Standard way of thinking of system protection relay method (digital edition)" issued by the Federation of Electric Power Companies of Japan in March 1992 It is equivalent to the digital relay system shown in. In the figure, 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 composed of three-phase lines of A phase, B phase, and C phase. 6 is a self-end electrical station provided on one side of the power transmission line 1, 7 is a mating end electrical station provided on the other mating end of the power transmission line 1 that is separated from the self end, and 200 is a self-end electrical station. A digital relay device (hereinafter, referred to as a relay device on the self-end side) 300 is a digital relay device (hereinafter, referred to as a relay device on the other end side) installed at the other end electric station 7.

Next, the configurations of the relay device 200 on the self-end side and the relay device 300 on the opposite end side will be described. In addition,
FIG. 8 illustrates the configuration of the relay device 200 on the self-end side, but the relay device 300 on the opposite end also has the same configuration. In the figure, 11 is an analog filter, 12 is a sample and hold circuit that holds data, 13 is a multiplexer circuit that switches input channels, 14 is an analog-digital conversion circuit, 15 is an arithmetic unit that performs relay arithmetic using input data, and 16 is 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
0 is a self-end circuit breaker for breaking the transmission line 1, 22 is a current transformer of the other end relay device 300, 26 is a voltage transformer of the other end relay device 300, and 31 is the other end circuit breaker. is there.

The relay device 200 on the self-end side and the relay device 300 on the opposite end side respectively convert the current and voltage of the transmission line 1 of the power system into the current transformers 21 and 22 and the voltage transformer 25, respectively.
The analog quantity is taken in through 26, the direct current component and the harmonic component are removed by the analog filter 11, the fundamental wave is held in the sample hold circuit 12 at a constant interval, the channels of the multiplexer 13 are sequentially switched, and the analog amount is converted into an analog / digital conversion circuit. Set it in a form that can be digitally calculated by 14. Then, the calculation device 15 performs relay calculation according to the basic principle described below, determines an internal accident, and outputs a trip command to the input / output unit 1
6 is output, and the transmission line 1 is protected by the self-end circuit breaker 30 and the counterpart circuit breaker 31.

The relay system, which is the basic principle of this transmission line protection relay device, is shown in P164 to P167 of "Protective relay engineering" issued by the Institute of Electrical Engineers of Japan in 1981, for example. Since this relay system does not require signal transmission between electric stations, it is widely used as a 77 kV to 66 kV class transmission line protection, but in principle, in the case of an accident near each electric station, a relay device near the accident point. Operates first, and then the relay device at the other end operates, so this relay system may prolong the accident elimination time.

[0006] In recent years, due to problems such as difficulty in securing a site and environmental protection, the construction of power transmission lines tends to have multiple terminals such as three terminals and four terminals, and the protection relay system is strongly improved in performance and reliability. Is required. Therefore, a current differential protection method is applied to solve problems such as intra-section charging current in a multi-terminal system, internal accidents associated with outflow, and passage of power flow during an accident.

The current differential protection method will be described below by taking the 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 this multi-terminal transmission line protection system is applied to a 4-terminal system. 9, parts that are the same as or correspond to those in FIG. 8 are assigned the same reference numerals and explanations thereof are omitted. In the figure, 17 is a serial / parallel converter, 18 is an optical / electrical converter,
Reference numeral 19 is a parallel / serial converter, and 20 is an electric / optical converter.

This multi-terminal transmission line protection system includes a master relay device 400 and a master relay device 40 which perform relay calculation.
0, while transmitting the current information to 0, the child end relay device 50 for removing the other end circuit breakers 31 to 33 on the child end relay device side in response to a transfer interruption command from the parent end relay device 400.
0, child end relay device 600, child end relay device 700,
The optical fiber 10 connects the parent-end relay device 400, the child-end relay device 500, the child-end relay device 600, and the child-end relay device 700. The master relay device 400, the slave relay device 500, and the slave relay device 6
00 and the hardware of the slave terminal relay device 700 have the same configuration.

Next, the operation of this 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 master-end relay device 400, the slave-end relay device 500, the slave-end relay device 600, and the slave-end relay device 700 installed at each end of the transmission line. They are connected in a loop by 10 and current information at each end is time-divisionally serially transmitted via this optical fiber 10. First, an empty data frame in which current data is not written is transmitted from the master relay device 400 to the slave relay device 500. In the slave terminal relay device 500, the optical / electrical converter 18 performs optical / electrical conversion on the received signal, and the serial / parallel converter 17 converts the converted signal from serial to parallel,
The current data fetched by the current transformer 22 is written to the frame F1 for the child relay device 500 in the data frame, and further parallel-to-serial conversion is performed by the parallel / serial converter 19, and electricity is converted by the electric / optical converter 20 to electricity → Do light conversion,
This data frame is transferred to the child relay device 700.

Thereafter, the same operation is performed in the child end relay device 600 and the child end relay device 700, and in the child end relay device 600, the child end relay device 60 in the data frame.
The current data fetched by the current transformer is written in the frame F2 for 0, and the child end relay device 700 writes the current data fetched by the current transformer in the frame F3 for the child end relay device 700 in the data frame. The data frame in which the terminal current data is written is transmitted to the master end relay device 400. Proximity relay device 40
The arithmetic unit 15 of 0 performs the current differential calculation using the child end current information and the self end current information. When it is determined that there is an internal failure based on the calculation result, the master relay device 40
0 operates the self-end circuit breaker 30 and also writes the transfer cutoff data in the frame for the master end relay device in the data frame to operate the other end circuit breakers 31 to 33.

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

[0012]

Since the conventional power transmission line protection relay device is configured as described above, a protection system in which a change in the number of terminals or the like occurs in the power system in which the relay device is installed occurs. If the change is required, the existing relay device will be moved or discarded and a new relay device will be installed, resulting in an increase in cost and a problem that PCM cannot be easily implemented.

The present invention has been made to solve the above problems, and provides a power system protection relay device capable of accommodating a large number of terminals without increasing the cost and realizing an upgrade of the protection function. The purpose is to get.

[0014]

According to a first aspect of the present invention, there is provided a power system protection relay device including a line selection relay protection system and a line selection relay protection system.
And the software that realizes different protection methods of the current differential protection method and the line selection relay protection method or the power protection method.
Flow protection method, and a protection method selected by the protection method selection means.
Hardware that allows the addition of hardware to establish
Hardware establishment means having a hardware expansion means, which execute software that realizes the protection scheme selected by the protection method selection unit and to and a protection means for protecting the electric power system to be the protected Is.

The electric power system protective relay apparatus according to the second aspect of the present invention, protection means, said current difference when the protection system by Ri electrostatic <br/> current differential protection scheme selection means is selected running software for realizing the dynamic protection scheme, in which by utilizing the additional hardware by hardware expansion means so as to protect the power system to be the protected.

A power system protection relay device according to a third aspect of the present invention is a condition terminal for setting a selection condition for externally changing the selection of a line selection relay protection system or a current differential protection system. The stand is equipped with the protection method selection means.

According to a fourth aspect of the present invention, there is provided a power system protection relay device in which a selection condition of a line selection relay protection system or a current differential protection system is externally selected by short-circuiting predetermined terminals of a condition terminal block. A protection method selecting means to be set is provided.

An electric power system protection relay device according to a fifth aspect of the present invention is a general control C for supervising a set protection system.
The protection means is equipped with a PU card, and the protection method selection means sets either the line selection relay protection method or the current differential protection method based on the selection condition sent from the integrated CPU card. It is a thing.

According to a sixth aspect of the present invention, there is provided an electric power system protection relay device which, at power-on or during initial setting processing, sets a selection condition set on a condition terminal block or a selection condition sent from a general CPU card. After reading, selecting either the line selection relay protection method or the current differential protection method based on the selection conditions, and after the power is turned on or after the initial setting processing, at the time of turning on the power or the initial setting processing. A protection method selecting means for selecting either a line selection relay protection method or a current differential protection method based on the read selection conditions is provided.

According to a seventh aspect of the present invention, there is provided a power system protection relay device, wherein condition setting for setting a selection condition for setting the selection of the line selection relay protection system or the current differential protection system to be changeable from the outside. The protection system selecting means has a protection switch, and an integrated 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 is provided with an arithmetic CPU card for protecting the system.

According to the eighth aspect of the present invention, there is provided a power system protection relay device in which an integrated CPU card is provided with a condition setting switch.

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

A power system protection relay device according to a tenth aspect of the present invention,
Read the selection condition set by the condition setting switch, select either the line selection relay protection method or the current differential protection method based on the selection condition, and when the power is turned on or after the initial setting process. In the above, a protection method selecting means for selecting either the line selection relay protection method or the current differential protection method based on the selection condition read at the time of turning on the power or in the initial setting process is provided. is there.

According to the eleventh aspect of the present invention, in a power system protection relay device, an abnormality of the arithmetic CPU card or a mismatch of selection conditions set in the condition setting switches provided in the arithmetic CPU card and the general CPU card, respectively. Is provided with a monitoring means for monitoring.

According to a twelfth aspect of the present invention, there is provided a power system protection relay device, wherein predetermined pattern data is transmitted from an integrated CPU card to an arithmetic CPU card, and thereafter the arithmetic CPU card is operated.
By comparing the selection condition set in the arithmetic CPU card and the selection condition set in the general CPU card added to the predetermined pattern data by the card in the general CPU card, The arithmetic CPU card and the centralized CPU card are provided with a monitoring means for monitoring the mismatch of the selection conditions respectively set.

According to a thirteenth aspect of the present invention, there is provided a power system protection relay device, wherein predetermined pattern data is transmitted from an integrated CPU card to an arithmetic CPU card, and then the arithmetic CPU card is operated.
A monitoring means for monitoring the abnormality of the arithmetic CPU card depending on whether the selection condition set in the card is added to the predetermined pattern data and sent from the arithmetic CPU card within a predetermined time is provided. It was done.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a block diagram showing a configuration of a relay device of a power system protection relay device according to a first embodiment of the present invention. A power system to be protected by this power system protection relay device is, for example, FIG. This is the case where the power system shown in FIG. 9 was changed to the power system shown in FIG. 9 and the necessity of coping with the multi-terminals occurred, and the relay device shown in FIG. Will be installed at each end of the transmission line of the power system. Further, the arrangement of the current transformer, the voltage transformer, and the circuit breaker of each relay device was similar to that of FIG. 8, but with the increase in the number of terminals, the current transformer, the voltage transformer, and the circuit breaker of FIG. The layout is changed. Although FIG. 1 illustrates the configuration of the relay device 2a, other relay devices installed at each end of the power transmission line of the power system to be protected after the change have the same configuration. In the figure, 11 is an analog filter, 12 is a sample and hold circuit that holds data, 13 is a multiplexer circuit that switches input channels, 14 is an analog / digital conversion circuit, and 15 is an arithmetic unit (protection means) that performs relay arithmetic using input data. ), 16 is an input / output unit for outputting a trip command, 51 is software for realizing the line selection relay protection system, and 52 is software for realizing the current differential protection system.

Reference numeral 40 denotes a condition terminal block (protection method selection means) whose setting can be changed from the outside.
The condition setting set in the above is read into the arithmetic unit 15 via the input / output unit 16. In this case, for example, when the terminal a and the terminal P of the condition terminal block 40 are connected, the line selection relay method is used, and when the terminal b and the terminal P are connected, the current differential relay method is used. According to the predetermined selection conditions, the plurality of installed software 51, 52
The software that realizes the protection method 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 parallel / serial converter 19, a socket for a hardware expansion board such as 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.

[0029] The relay apparatus 2a, transmission line 1 of the current of the electric power system shown in FIG. 9 after the change, respectively current transformer voltage takes through the voltage transformer, the analog filter 1
The DC component and the harmonic component are removed by 1, and the fundamental wave is held in the sample hold circuit 12 at a constant interval.
3 channels are sequentially switched to change the analog amount to analog
The digital conversion circuit 14 prepares for digital calculation. Then, the software 51 of the arithmetic unit 15 performs a relay operation according to the basic principle described below, determines an internal accident, outputs a trip command from the input / output unit 16, and interrupts and protects the power transmission line 1 by the circuit breakers 30 and 31. It is a thing.

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. The process starts from step ST101 at the time of power-on or initial setting, 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 the overall CPU card (not shown). Next, the selection condition recognized in step ST104 is held in, for example, a memory. The processing up to this point is a processing step that is executed only when the power is turned on or at the time of initial setting.

[0031] On the other hand, usually at the time of start from step ST102, in step ST105, step ST
Based on the selection condition held in 104, which protection method relay calculation is to be performed is selected, and when the line selection protection relay method is selected, step ST106 is executed,
If the current differential protection method is selected, step ST107 is executed.

When the current differential protection method is selected, the optical / electrical converter 18, the serial / parallel converter 17, the parallel / serial converter 19 and the electrical / optical converter 2 shown in FIG. 9 are naturally used.
It is necessary to add hardware such as 0 to each relay device, and to install a communication path by an optical fiber that connects each relay device in a loop.

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

[0034] Therefore, according to the first embodiment, the protection scheme of the electric power system to the current differential protection method from the line selection relay protection scheme can be easily and inexpensively changed, the change of the power system with the number of terminals There is an effect that a power system protection relay device that can be easily and inexpensively coped with, can suppress the cost increase and can improve the protection function can be obtained.

[0035] Embodiment 2. 3 is a block diagram showing a configuration of a relay device of a power system protection relay device according to a second embodiment of the present invention. A power system to be protected by this power system protection relay device is also shown in FIG. The power system shown in FIG. 9 is changed to the power system shown in FIG. 9 as the number of terminals increases. 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 also the same as in FIG. Note that FIG.
Shows the configuration of the relay device 2b, but 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, parts that are the same as or correspond to those in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted. In the figure, 15a is a general CPU card (protection means), 15b is an arithmetic CPU card (protection means), and SW1 is a condition setting switch (protection method selection means) provided in the general CPU card 15a.

[0036] Next, the operation will be described. In the power system protection relay device according to the second embodiment, the integrated CPU card 1
The selection condition set by the condition setting switch SW1 such as a DIP switch provided in 5a is read into the internal memory, and, for example, the condition setting switch S
When the W1 is switched to the a side, the line selection relay protection method is selected, and when the W1 is switched to the b side, the differential CPU protection method is selected according to the predetermined conditions. Send the condition. Based on this selection condition, the arithmetic CPU card 15b selects and executes software according to the selection condition from a plurality of pre-installed software 51, 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 by, the optical / electrical converter 18, the serial / parallel converter 17,
It is necessary to add hardware such as the parallel / serial converter 19 and the electric / optical converter 20 to each relay device, and to lay a communication path by an optical fiber that connects each relay device in a loop.

[0038] Therefore, the light-to-electrical converter 18, serial-parallel converter 17, a parallel-serial converter 19, the electrical-optical converter 2
0 and other hardware, and the addition and control of a communication path by an optical fiber 10 that connects each relay device in a loop
Condition setting switch SW1 provided in the PU card 15a
By changing the setting, the current differential relay protection method can be easily realized corresponding to the power system shown in FIG. 9 after the 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 it is possible to obtain a power system protection relay device that can easily and inexpensively respond to the accompanying change in the power system, suppress an increase in cost, and improve the protection function.

[0040] Embodiment 3. 4 is a block diagram showing a configuration of a relay device of a power system protection relay device according to a third embodiment of the present invention. A power system to be protected by this power system protection relay device is also shown in FIG. 8, for example. The power system shown in FIG. 9 is changed to the power system shown in FIG. 9 as the number of terminals increases. 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 also the same as in FIG. Note that FIG.
Shows the configuration of the relay device 2c, but the same configuration applies to other relay devices installed at each end of the transmission line of the power system to be protected after the change. 4, parts that are the same as or correspond to those in FIG. 3 are given the same reference numerals and description thereof is omitted. In the figure, SW2 is the arithmetic CPU card 15
It is a condition setting switch (protection method selection means) provided in b.

[0041] Next, the operation will be described. In the power system protection relay device according to the third embodiment, the arithmetic CPU card 1
The selection condition set in the condition setting switch SW2 such as a dip switch provided in 5b is read into the internal memory. For example, when the condition setting switch SW2 is switched to the side a, the line selection relay protection method is used. , B side, according to a predetermined condition such as a current differential relay protection method, based on this selection condition, for example, a plurality of mounted by the flowchart shown in FIG. The protection method set from the software 51, 52 is selected.

In this case, the condition setting switch SW2
When the current differential relay protection method is selected by, the hardware such as the optical / electrical converter 18, the serial / parallel converter 17, the parallel / serial converter 19, the electrical / optical converter 20 is selected 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 that connects each relay device in a loop is installed.

[0043] Therefore, the light-to-electrical converter 18, serial-parallel converter 17, a parallel-serial converter 19, the electrical-optical converter 2
0, etc., and addition of a communication path by the optical fiber 10 for connecting each relay device in a loop and calculation C
Condition setting switch SW2 provided in the PU card 15b
By changing the setting of, it is possible to easily support the changed power system and improve the protection function.

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

[0045] Embodiment 4. FIG. 5 is a block diagram showing a configuration of a relay device of a power system protection relay device according to a fourth embodiment of the present invention. A power system to be protected by this power system protection relay device is also shown in FIG. 8, for example. The power system shown in FIG. 9 is changed to the power system shown in FIG. 9 as the number of terminals increases. 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. Further, the current transformer, voltage transformer, and breaker of each relay device are also arranged and configured in the same manner as in FIG. Although FIG. 5 illustrates the configuration of the relay device 2d, 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 is a calculation CPU card 1 for calculating predetermined pattern data from the general CPU card 15a.
5b, the selection condition set in the calculation CPU card 15b added to the predetermined pattern data by the calculation CPU card 15b and sent, and the selection condition set in the general CPU card 15a. Is a monitoring means provided in the general CPU card 15a for monitoring the mismatch of the selection conditions set in the arithmetic CPU card 15b and the general CPU card 15a.

[0046] Next, the operation will be described. FIG. 7 is a relay device 2d of the power system protection relay device according to the fourth embodiment.
5 is a flowchart showing the operation of the arithmetic CPU card 15b. FIG. 6 shows the monitoring means 53 of the integrated CPU card 15a.
5 is a flowchart showing a monitoring operation by the. General CP
The U card 15a reads and holds the selection condition from the condition setting switch SW1 at the time of power-on and initial setting. The arithmetic CPU card 15b also reads the selection condition from the condition setting switch SW2 and holds it at the time of power-on and initial setting. Then, the overall CPU card 15a transmits the fixed pattern data to the arithmetic CPU card 15b at regular intervals. The arithmetic CPU card 15b which has received the constant pattern data adds the setting conditions held at the initial setting to the received constant pattern data in step ST108 or step ST109 shown in FIG.
The transmitted constant pattern data to which the setting condition is added is received by the general CPU card 15a, and the monitoring means 53 is used.
If the setting conditions match, the constant pattern data is transmitted again to the arithmetic CPU card 15b after a fixed time. On the other hand, if the selection conditions do not match, the integrated CPU card 15a outputs an external alarm from the input / output unit 16.

[0047] Incidentally, the general CPU card 15a, after transmitting a constant pattern data, sending selection conditions set in the calculation CPU card 15b from said added to the constant pattern data calculation CPU card 15b within a predetermined time If not, it is determined that the arithmetic CPU card 15b is abnormal.

[0048] Also in the fourth embodiment, when a current differential relay protection method is selected by the condition setting switch SW2, readily changes to the power system shown in FIG. 9 from the power system of FIG. 8 Can handle. In the fourth embodiment also, the optical / electrical converter 18, the serial / parallel converter 17,
It is necessary to add hardware such as the parallel / serial converter 19 and the electric / optical converter 20 to each relay device, and to lay a communication path by an optical fiber that connects each relay device in a loop.

[0049] Therefore, the light-to-electrical converter 18, serial-parallel converter 17, a parallel-serial converter 19, the electrical-optical converter 2
0, etc., and addition of a communication path by the optical fiber 10 for connecting each relay device in a loop and calculation C
Condition setting switch SW2 provided in the PU card 15b
By changing the setting of, it is possible to easily and inexpensively respond to the change of the power system due to the increase in the number of terminals, 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 power system protection method can be changed from the line selection relay protection method to the current differential protection method 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 cost be improved and the protection function can be improved, but also whether or not the arithmetic CPU card 15b is functioning normally can be monitored by the monitoring means 53, and a highly reliable power system protection relay device can be obtained. effective.

Further , even when 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 arithmetic CPU card 15b, the alarm can be issued to the outside. There is an effect that a highly reliable power system protection relay device can be obtained.

[0052]

As described above, according to the first aspect of the present invention, software for realizing different protection systems of the line selection relay protection system and the current differential protection system , and the line selection relay protection system. Or current differential protection method
Protection method selecting means for selecting one of them, and the protection method selection
Hard to establish the protection scheme selected by the means
Has a hardware expansion means that enables the expansion of hardware
Hardware establishing means that executes the software to realize the selected protection scheme by the protection method selection means
Since the relay device is provided with the protection means for protecting the power system to be protected, the number of terminals of the power system is changed from the line selection relay protection system to the current differential protection system as the power system has multiple terminals. Even if it is necessary to change the protection method, it is possible to easily and inexpensively change the relay device that was compatible with the line-selective relay protection system to a relay device that is compatible with the current differential protection system. There is an effect that it is possible to obtain a power system protection relay device that can easily and inexpensively respond to changes in the power system, suppress high costs, and improve the protection function.

[0053] According to the second aspect of the present invention, protection means, when the current differential protection method is selected by the protection method selection means executes the software to realize the said current differential protection scheme, hardware expansion since it is configured to protect the additional hardware power system to be protected object by using the means, the power in accordance with the number of terminals of the power system to the current differential protection method from the line selection relay protection scheme Even if it is necessary to change the system protection method, you can easily and cheaply change the relay device that was compatible with the line selection relay protection system to the relay device that is compatible with the current differential protection system.
There is an effect that a power system protection relay device capable of easily and inexpensively responding to the change of the power system due to the increase in the number of terminals and suppressing the cost increase and improving the protection function can be obtained.

[0054] According to the third aspect of the present invention, configured with a conditional terminal block for selection condition setting for setting the selection of the line selection relay protection system or current differential protection scheme can be changed from the outside 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 with the increase in the number of terminals in the power system, the line selection relay protection method is still supported. The conventional relay device can be changed to a relay device compatible with the current differential protection method easily and inexpensively by changing the selection condition set by the conditional terminal block, and it is easy to change the power system due to the increase in the number of terminals. There is an effect that it is possible to obtain a power system protection relay device that can be handled at low cost and that can suppress the cost increase and improve the protection function.

[0055] According to the fourth aspect of the present invention, to constitute a selection condition of the line selection relay protection system or current differential protection scheme by short-circuiting between the conditional terminal block of a predetermined terminal so as to externally set 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 has been supported until then. It can be easily and inexpensively changed by changing the short circuit condition between the terminals in the conditional terminal block to a relay device compatible with the current differential protection method.Easy and cheap to change the power system due to the increase in the number of terminals. There is an effect that a power system protection relay device that can cope with the above and can suppress the cost and improve the protection function can be obtained.

[0056] According to the invention of claim 5, wherein, overall CPU
Since it is configured to set either the line selection relay protection method or the current differential protection method based on the selection condition sent from the card, it depends on the selection condition sent from the general CPU card. Also has the effect of being able to set either the line selection relay protection method or the current differential protection method.

[0057] According to the invention of claim 6, wherein, in the power-on or initial setting processing to read the selection condition sent from the selection criteria or overall CPU card is set in the condition the terminal block, the selection condition 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 processing, the selection condition read at the time of turning on the power or during the initial setting processing is selected. Since it was originally configured to select either the line-selective relay protection method or the current differential protection method, the line-selective relay protection method changed to the current differential protection method as the power system became multi-terminal. Even if it is necessary to change the system protection method, the relay device that was compatible with the line-selective relay protection system up to that point is replaced with a relay device that supports the current differential protection system. It can be easily and inexpensively changed by reading the selection conditions set at the condition terminal block or the selection conditions sent from the centralized CPU card at the time of turning on or initial setting processing, and the change of the power system due to the increase in the number of terminals. There is an effect that a power system protection relay device that can easily and inexpensively cope with, can suppress the cost increase and improve the protection function can be obtained.

[0058] According to the invention of claim 7, wherein a condition switch settings for selection condition setting for setting can be changed to select the line selection relay protection system or current differential protection method from the outside, the condition A configuration is provided that includes an integrated CPU card for controlling the protection method selected and set by the setting switch, and an arithmetic CPU card that executes software that implements the protection method and protects the power system to be protected. 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 with the increase in the number of terminals in the power system, the line selection relay protection method is still supported. The existing relay device can be changed to a relay device compatible with the current differential protection method easily and inexpensively 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.

[0059] According to the invention of claim 8, since it is configured to include a switch condition set to the overall CPU card, current differential protection method from the line selection relay protection scheme in accordance with the number of terminals of the power system Even if it becomes necessary to change the protection system of the power system to the relay device compatible with the current differential protection system, the integrated CPU card is equipped with the relay device compatible with the line selective relay protection system. It can be changed easily and inexpensively depending on the condition setting switch.
There is an effect that a power system protection relay device capable of easily and inexpensively responding to the change of the power system due to the increase in the number of terminals and suppressing the cost increase and improving the protection function can be obtained.

[0060] According to the invention of claim 9, since it is configured to include a switch condition set in operation the CPU card, the current differential protection method from the line selection relay protection scheme in accordance with the number of terminals of the power system Even if it becomes necessary to change the protection system of the power system to the relay device compatible with the current differential protection system, the arithmetic CPU card is equipped with the relay device compatible with the line selective relay protection system. It can be changed easily and inexpensively depending on the condition setting switch.
There is an effect that a power system protection relay device capable of easily and inexpensively responding to the change of the power system due to the increase in the number of terminals and suppressing the cost increase and improving the protection function can be obtained.

[0061] According to the invention of claim 10, wherein, in the power-on or initial setting processing to read the selection condition set by the switch condition setting, line selection relay protection method or on the basis of the selection condition After selecting any one of the current differential protection methods, after the power is turned on or after the initialization processing, the line selection relay protection method or the line selection relay protection method based on the selection conditions read at the time of power-on or initialization processing. Since it is configured to select one of the current differential protection methods, 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 as the power system has multiple terminals. However, the relay device that was compatible with the line selection relay protection method until then is changed to a relay device that supports the current differential protection method when the power is turned on or during the initial setting process. A power system protection relay device that can be easily and inexpensively changed depending on the state of the condition setting switch, can easily and inexpensively respond to the change of 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 to be obtained.

[0062] According to the invention of claim 11 wherein, calculating CP
Since the monitoring means for monitoring the abnormality of the U card and the inconsistency of the selection conditions respectively set in the condition setting switches provided in the arithmetic CPU card and the general CPU card is provided, the general CPU card is set. Even if the selected condition and the selected condition set in the arithmetic CPU card do not match, an alarm can be issued to the outside, and whether the arithmetic CPU card is functioning normally by the monitoring means or not. There is an effect that the monitoring can be performed and a highly reliable power system protection relay device can be obtained.

[0063] According to the invention of claim 12 wherein, the overall CP
After the predetermined pattern data is transmitted from the U card to the arithmetic CPU card, the arithmetic C is added to the predetermined pattern data by the arithmetic CPU card and transmitted.
Selection conditions set in the PU card and the integrated CPU
By comparing the selection conditions set in the card with the general CPU card, the monitoring means monitors the discrepancy between the selection conditions set in the arithmetic CPU card and the general CPU card. Even if the selection condition set in the centralized CPU card and the selection condition set in the arithmetic CPU card do not match, an alarm can be issued to the outside, so a highly reliable power system protection relay device can be provided. There is an effect to be obtained.

[0064] According to the invention of claim 13 wherein, the overall CP
After transmitting the predetermined pattern data from the U card to the arithmetic CPU card, the selection condition set in the arithmetic CPU card is added to the predetermined pattern data and transmitted from the arithmetic CPU card within a predetermined time. Since the monitoring means is configured to monitor the abnormality of the arithmetic CPU card depending on whether the arithmetic CPU card comes or not, it is possible to monitor whether or not the arithmetic CPU card is functioning normally by the monitoring means. There is an effect that a high power system protection relay device can be obtained.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation of a computing device of a relay device in the power system protection relay device according to 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 a second embodiment 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 a third embodiment 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 a fourth embodiment of the present invention.

FIG. 6 is a flowchart showing the monitoring operation by the monitoring means of the general CPU card in the relay device of the power system protection relay device according to the fourth embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the arithmetic CPU card of the relay device of the power system protection relay device according to the fourth embodiment of the present invention.

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

FIG. 9 is a system configuration diagram showing a conventional power system protection relay device when a multi-terminal transmission line protection system by a current differential protection system is applied to a 4-terminal system.

[Explanation of symbols]

2a, 2b, 2c, 2d relay device, 15 arithmetic means means (protection means), 15a integrated 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.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02H 3/02-3/05 H02H 3/28 H02H 3/36

Claims (13)

(57) [Claims] 1. A power system is constructed by detecting an accident in a power system to be protected, and shutting off each relay of the power system by a relay device on the self-end side and a relay device on the other end of the power system. In the power system protection relay device to protect, the software for realizing different protection methods of the line selection relay protection method and the current differential protection method for the relay device on the self-end side and the relay device on the other end side, respectively, Line selection relay protection method or current differential protection method
Establishing a protection method selection means for selecting a Zureka, the protection scheme selected by the protection method selection means
Hardware that allows you to add hardware
Hardware establishment means having A expansion means, said protection system electric power system protection with running software for realizing the selected protection scheme by the selection means and protection means for protecting the electric power system to be the protected Relay device. 2. A protection means, when the current differential protection method is selected by the protection method selection means executes the software to realize the said current differential protection scheme, the additional hardware by hardware expansion means use to electric power system protective relay device according to claim 1, wherein the protecting power system to be protected target. 3. The protection system selecting means is provided with a condition terminal block for setting selection conditions for externally changing the selection of the line selection relay protection system or the current differential protection system. The power system protection relay device according to claim 2. 4. The protection system selecting 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 3. A power system protection relay device according to item 3. 5. The protection means includes an integrated CPU card for controlling the set protection method, and the protection method selection means protects the line selection relay based on a selection condition sent from the integrated CPU card. The power system protection relay device according to claim 3 or 4, wherein the system is set to either a system or a current differential protection system. 6. The protection method selection means reads the selection condition set in the condition terminal block or the selection condition sent from the general CPU card at power-on or in the initial setting process, and based on the selection condition. Either the line selection relay protection method or the current differential protection method is selected for, and after the power is turned on or after the initial setting processing, the selection condition read at the time of turning on the power or during the initial setting processing is used. 6. The power system protection relay device according to claim 5, wherein either the line selection relay protection system or the current differential protection system is selected as the line selection relay protection system. 7. The protection method selection means has a condition setting switch for setting selection conditions for externally changing the selection of the line selection relay protection method or the current differential protection method, and the protection means selection means. Includes an integrated CPU card for controlling the protection method selected and set by the condition setting switch, and an arithmetic 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, wherein 8. The power system protection relay device according to claim 7, wherein the condition setting switch is provided in the integrated CPU card. 9. The power system protection relay device according to claim 7 or 8, wherein the condition setting switch is provided in the arithmetic CPU card. 10. The protection method selection means reads the selection condition set by the condition setting switch at power-on or in initial setting processing, and based on the selection condition, the line selection relay protection method or current difference. One of the dynamic protection methods is selected, and when the power is turned on or after the initialization processing, the line selection relay protection method or the current difference protection method is selected based on the selection conditions read in the power-on or the initialization processing. The power system protection relay device according to any one of claims 7 to 9, wherein any one of the dynamic protection methods is selected. 11. An arithmetic CPU card abnormality or an arithmetic CPU
11. The power system protection relay according to claim 9 or 10, further comprising monitoring means for monitoring inconsistency of selection conditions set in the condition setting switches provided in the card and the integrated CPU card. Electrical equipment. 12. The monitoring means sets predetermined pattern data from the general CPU card to the arithmetic CPU card and then sets the arithmetic CPU card to add the predetermined pattern data to the arithmetic CPU card. By comparing the selected condition set in the centralized CPU card with the selected condition set in the centralized CPU card, the discrepancy between the selected conditions set in the arithmetic CPU card and the centralized CPU card is monitored. The power system protection relay device according to claim 11, wherein: 13. The monitoring means transmits predetermined pattern data from the centralized CPU card to the arithmetic CPU card, and then the selection condition set in the arithmetic CPU card is added to the predetermined pattern data to obtain the arithmetic CPU.
12. The power system protection relay device according to claim 11, wherein an abnormality of the arithmetic CPU card is monitored depending on whether the card is sent from the card within a predetermined time.