JP2002218642A - Digital protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital protective relay device, by which the change of a relay operation contents and a sequence process contents can be easily performed and the reliability of the device is improved. SOLUTION: An operation circuit 24 executes a relay operation program stored in each IC chip 23 for relaying and performs a protective operation for each relay element. Via setting switches 26, the setting of input-and-output position for the IC chips 23 for relaying is performed. Therefore, upon changing the relay operation contents, the change per unit IC chip is possible, and the change of position setting can be executed via the setting switches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital protection relay used for protecting a power system.

[0002]

2. Description of the Related Art In general, a digital protection relay device converts a quantity of electricity in a power system from an analog quantity to a digital quantity and performs a relay operation by a microcomputer to perform a protection operation.

FIG. 4 is a configuration diagram of a conventional digital protection relay device. The current and voltage, which are the amounts of electricity in the power system, are transmitted through the input converter 2 of the digital protection relay 1 to A.
It is input to the / D converter 3 and converted into a digital quantity. A /
The digital amount converted by the D converter 3 is input to the relay operation processing unit 4.

[0004] The relay operation processing section 4 performs a relay operation based on the read electric quantity, and outputs a relay operation signal to the sequence operation processing section 5 when the electric quantity deviates from a predetermined set value. Sequence operation processing unit 5
When a relay operation signal is input from the relay arithmetic processing unit 4, the controller performs control processing such as sequence processing and reclosing. Information necessary for this control processing is input from an input processing unit 7 via an HCU element (human interface control element) 6.

[0005] By the control processing in the sequence operation processing section 5, the HCU element 6
The trib signal is output from the output processing unit 8 via the.
Further, a display signal indicating that the trip signal has been output is output to the human interface unit 9.

The set value of the relay operation is set by the human interface unit 9 and stored in the HCU element 6. That is, the set value set by the human interface unit 9 is stored in the non-volatile memory of the HCU element 6, and the stored set value is used by the relay calculation processing unit 4 for relay calculation.

FIG. 5 is an explanatory view of the relay operation processing section 4, in which FIG. 5A is a configuration diagram, and FIG.
FIG. 3 is a detailed view of a C chip 10. In FIG. 5A, a relay operation program is stored in the relay operation IC chip 10, and the operation circuit 11 performs the relay operation by executing the relay operation program stored in the relay operation IC chip 10. . The RAM 12 is used for temporarily storing data in the middle of the calculation during the calculation. Here, the IC chip 10 for the relay operation has a structure shown in FIG.
As shown in (b), corresponding to a plurality of relay elements,
A plurality of relay operation programs 13 are stored.

FIG. 6 is an explanatory diagram of the sequence operation processing section 5, FIG. 6 (a) is a configuration diagram, and FIG. 6 (b) is a detailed diagram of the sequence operation IC chip 14. In FIG. 6A, a sequence operation program is stored in the sequence operation IC chip 14, and the operation circuit 15 executes the sequence operation program stored in the sequence operation IC chip 14 to perform the control processing operation. Do. RAM1
Numeral 6 is used for temporarily storing data in the middle of the calculation during the calculation. Here, as shown in FIG. 6B, the sequence calculation IC chip 14 stores a plurality of sequence calculation programs 17 corresponding to a plurality of relay elements.

FIG. 7 is a configuration diagram of the HCU element 6. HC
The U IC chip 18 has a human interface
The control program is stored, and the arithmetic circuit 19 executes the human interface control program stored in the HCU IC chip 18 to perform the HCU processing calculation. The RAM 20 is used to temporarily store data in the middle of the operation during the operation. The nonvolatile memory 21 stores important data such as a set value set by the human interface unit 9.

As described above, a plurality of relay operation programs 13 are stored in the relay operation IC chip 10 of the relay operation processing section 4, and a plurality of sequence operation IC chips 14 are also stored in the sequence operation processing section 5 of the sequence operation processing section 5. Number of sequence operation programs 17 are stored.

[0011]

However, a relay operation program 13 for a plurality of relay elements is stored in one relay operation IC chip 10, and a sequence operation program 17 for a plurality of relay elements is stored in one sequence operation IC. Since it is stored in the chip 14, when a change in the relay element or the sequence processing occurs, the relay calculation IC chip 10 of the relay calculation processing unit 4 and the sequence calculation IC chip 1 of the sequence calculation processing unit 5
4 must be changed and the program mounted on each IC chip must be confirmed.

Further, even in the case of a change not related to the relay operation or the sequence processing, such as a change in the output position, a change in the analog input position, or a change in the set position, it is necessary to change the program of the IC chip.

An object of the present invention is to provide a digital protection relay device in which the content of relay operation and the content of sequence processing can be easily changed to improve the reliability.

[0014]

According to a first aspect of the present invention, there is provided a digital protection relay device, comprising: an input converter for inputting an electric quantity from a power system, and an analog quantity inputted by the input converter. An A / D converter for converting the A / D into
A digital protection relay comprising: an arithmetic processing device for performing a relay operation based on a digital amount of electricity converted by the D converter; and a human interface unit for setting a set value required for the relay operation in the arithmetic processing device. In the apparatus, the arithmetic processing unit is provided for each relay element of the relay operation, stores a relay operation program of one relay element, and stores a set value set by the human interface unit. An IC chip; an arithmetic circuit for executing and executing a relay arithmetic program stored in the relay IC chip;
A setting switch provided for the C chip for setting an input / output position.

In the digital protection relay device according to the first aspect of the present invention, the arithmetic circuit executes a relay arithmetic program stored in each relay IC chip to perform a protection operation of each relay element. Also, with the setting switch,
The input / output position is set for each relay IC chip. Therefore, when the content of the relay operation is changed, I
Changes can be made in C-chip units, and position settings can be changed with the setting switch.

A digital protection relay device according to a second aspect of the present invention is the digital protection relay device according to the first aspect, wherein the arithmetic processing unit is duplicated, and when one of the arithmetic processing units becomes abnormal, the other arithmetic processing unit is used. And a switching circuit for switching between the two.

In the digital protection relay device according to the second aspect of the present invention, in addition to the operation of the first aspect of the invention, when one of the duplicated arithmetic processing units becomes abnormal, the other is switched by the switching circuit. Is switched to the arithmetic processing unit. Therefore,
Even if one of the processing units becomes abnormal, the protection operation can be continued.

[0018]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a digital protection relay device according to a first embodiment of the present invention.

A current and a voltage, which are electric quantities of the electric power system, are supplied to the A / A
It is input to the / D converter 3 and converted into a digital quantity. A /
The digital amount converted by the D converter 3 is calculated by the arithmetic processing unit 2
2 is input. The arithmetic processing unit 22 performs a relay operation based on the read amount of electricity, and determines that an accident has occurred in the power system when the amount of electricity deviates from a predetermined set value.

This relay operation is performed by an operation circuit 24 based on a relay operation program stored in a relay IC chip 23 provided for each relay element. FIG. 2 is an explanatory diagram of the relay IC chip 23. The relay IC chip 23 includes a program area 23a in which a relay operation program 13 for one relay element and a sequence operation program 17 for performing a sequence process of several patterns for the relay element are stored, and a set value or a time limit value of the relay element. And a non-volatile memory area 23b which is free to read and write.

Therefore, the arithmetic circuit 24 of the arithmetic processing unit 22
Then, the arithmetic processing is performed for one relay element based on the relay arithmetic program 13 and the sequence arithmetic program 17 from one relay IC chip 23. The RAM 25 temporarily stores data in the middle of the calculation in this calculation process. Information necessary for this control processing is input from the input processing unit 7 via an HCU element (human interface control element) 6.

A setting switch 26 for setting the analog input position, output position, set position, sequence pattern and the like of the relay element is provided corresponding to each relay IC chip 23. Switching of a plurality of sequence operation programs 17 stored in the program area 23a of the chip 23 is also performed by the setting switch 6.

The control IC chip 27 stores a control program such as a reclosing circuit, and the HIU IC chip 28 stores a human interface control program for controlling processing with the human interface unit 9. Is stored.

For example, the control program of the control IC chip 27 is executed by the arithmetic circuit 24 to perform control processing such as reclosing. In addition, by executing the Sea dog breed calculation program of the relay IC chip 23, a trip signal is output via the output processing unit 8 to the circuit breaker in the accident section of the power system.

Further, by executing the human interface control program of the HIU IC chip 28, a display signal indicating that the trip signal has been output is output to the human interface unit 9, while the settling set by the human interface unit 9 is performed. The value is stored in the non-volatile memory area 23b of the relay IC chip 23.

According to the first embodiment, when a change of the relay element occurs, it can be dealt with by replacing only the relay IC chip 23 for the changed relay element, and the confirmation can be made for the relay element. Only the IC chip 23 is confirmed. Further, when the output position is changed, the analog input position is changed, the set position is changed, or the sequence process is changed, the change of the setting of the setting switch 26 can be dealt with, so that the program does not need to be changed.

Next, a second embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a digital protection relay device according to a second embodiment of the present invention. The second embodiment differs from the first embodiment shown in FIG. 1 in that the arithmetic processing unit 22 is duplicated, and when one of the arithmetic processing units 22a becomes abnormal, the other arithmetic processing unit 22a becomes abnormal. A switching circuit 29 for switching to 22b is provided. The other configuration is the same as that of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference numerals and overlapping description will be omitted.

The arithmetic processing units 22a and 22b have the same configuration as the arithmetic processing unit 22 shown in FIG. 1, and it is assumed that the arithmetic processing unit 22a is selected and performs a protection operation. In this state, if any abnormality occurs in the arithmetic processing device 22a, the switching circuit 29 switches to the arithmetic processing device 22b.

According to the second embodiment, in addition to the effects of the first embodiment, even when one of the arithmetic processing units 22a becomes abnormal, the protection operation is continued by the other arithmetic processing unit 22b. Therefore, reliability is improved.

[0030]

As described above, according to the present invention,
The change of the relay element can be dealt with by replacing only the IC chip storing the changed relay operation program or sequence operation program. In addition, in the case of changes such as analog input position, output position, set position, and sequence processing, since only the setting switch setting can be handled, the program does not need to be modified, so that confirmation time can be reduced and reliability can be improved. .

By mounting a backup processing unit, the protection operation can be continued even if one of the processing units becomes abnormal, and the reliability can be further improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a digital protection relay device according to a first embodiment of the present invention.

FIG. 2 shows a relay I according to the first embodiment of the present invention.
FIG.

FIG. 3 is a configuration diagram of a digital protection relay device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional digital protection relay device.

FIG. 5 is an explanatory diagram of a relay operation processing unit in a conventional digital protection relay device.

FIG. 6 is an explanatory diagram of a sequence operation processing unit in a conventional digital protection relay device.

FIG. 7 is a configuration diagram of an HCU element in a conventional digital protection relay device.

[Explanation of symbols]

1. Digital protection relay device 2. Input converter 3. A /
D converter, 4 relay operation processing unit, 5 sequence operation processing unit, 6 HCU element, 7 input processing unit, 8 output processing unit, 9 human interface unit, 10 relay operation IC chip, 11 , 15, 19, 24: arithmetic circuit, 12, 16, 20, 25: RAM, 13: relay arithmetic program, 14: IC chip for sequence arithmetic, 1
7: Sequence operation program, 18: HCU IC chip, 21: Non-volatile memory, 22: Operation processing device, 2
3: IC chip for relay, 26: setting switch, 27:
Control IC chip, 28 HIU IC chip

Claims (2)

[Claims] 1. An input converter for inputting an electrical quantity from a power system, an A / D converter for converting an analog quantity input by the input converter into a digital quantity, and a conversion by the A / D converter. An arithmetic processing device that performs a relay operation based on the electric amount of the digital amount, and a digital protection relay device including a human interface unit that sets a set value required for relay operation in the arithmetic processing device, The arithmetic processing device is provided for each relay element of the relay operation, stores a relay operation program of one relay element, and stores a plurality of relay IC chips for storing a set value set by the human interface unit, An arithmetic circuit for executing and executing a relay arithmetic program stored in the relay IC chip, and an input circuit provided corresponding to each relay IC chip. A digital protection relay comprising: a setting switch for setting an output position. 2. The digital processing device according to claim 1, further comprising a switching circuit for duplicating the arithmetic processing unit and switching to one of the arithmetic processing units when one of the arithmetic processing units becomes abnormal. Protection relay.