JPS62135219A - Operation indicating circuit for protective relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operation display circuit for a protective relay device that displays a relay that has output a trip command to a circuit breaker.

[Conventional technology]

In general, a protective relay device has multiple relays that operate by detecting the relevant elements in the event of an accident in the power system, and outputs a trip command to the circuit breaker when the operating conditions of these relays are satisfied. In order to record the operation of the relay in the event of a system fault, it is equipped with an operation display circuit that indicates that the relay has operated.

For example, an operation display circuit of a protective relay device having three relays (hereinafter referred to as relays) each detecting a corresponding element will be explained using the circuit diagram shown in FIG. The operating outputs of relays 1 and 2.3 and the operating outputs of these relays 1 and 2.3 are used to set 1-9 and 10 of the 1-rip command circuit 4 to output to the circuit breaker, respectively, and display the display. 11.12
．． 13 is turned on. Operation display holding circuit 8,
9.10 is once set, the display 11.12.
13 is kept lit. This display return command circuit 14 is generally operated by a push button switch provided in a protective relay device.

In the operation display circuit of the protective relay device having the following configuration, the operation when the relay 1 is activated due to an accident in the power system will be explained. A trip command is output from the trip command circuit 4 by the operation output of the relay 1, and the AND gate 5 is established. The output of the AND gate 5 causes the operation display holding circuit 8 to be switched to the cell 1, and the display 11 is turned on. By operating the push button switch of the protective relay device and receiving a display return command from the display return command circuit 14, the operation display holding circuit 8 is reset, the display is turned off, and the next accident response is started.

[Problem that the invention seeks to solve]

As mentioned above, with conventional equipment, after a power system accident occurs,
After maintaining the operation display state and checking and recording the operation relay, the operation display holding circuit 8 is reset by a display return command from the push button switch, and the display 11 is turned off before the next operation. I need to go in. However, in recent unmanned power plants, it takes a lot of time for maintenance personnel to restore the display after a power system accident occurs. In this case, the circuit breaker is restarted between the time the accident occurs and the display is restored, and if another accident occurs, the indicators of the relay that operated last time and the relay that operated this time will light up, causing the accident. This caused confusion in analysis and investigation. The above-mentioned problem also occurred when the display was forgotten to return during maintenance 2 inspection and testing.

Therefore, the present invention provides an operation display circuit for a protective relay device that saves labor in maintenance and inspection and is compatible with unmanned electrical stations by updating the display contents in response to an accident even if no operation to restore the display is performed.

[Means for solving problems]

The present invention will be explained using the operation display circuit diagram of the protective relay device shown in FIG.

In the operation display circuit of a protective relay device having an operation display holding circuit that holds an indication of which operating output of a plurality of relays that operate upon detecting an accident in a power system causes the breaker to trip, 1 - a first circuit that outputs an output for a predetermined time according to a rip command; a second circuit that outputs an output when the reclose circuit of the breaker is not activated; and the operation when the outputs of the first and second circuits are established. This is an operation display circuit for a protective relay device including a third circuit that outputs a holding release command to the display holding circuit.

[Effect]

Each time the output of the first circuit, which is output within a predetermined period of time after the output of a trip command to the breaker, and the output of the second circuit, which is output when the reclose circuit of this breaker is not activated, are established, the third circuit is activated. The circuit retains the operation display and updates the circuit operation display contents.

〔Example〕

An embodiment of the present invention will be explained using the operation display circuit diagram of the protective relay device shown in FIG. 1 and the tie 11 chart showing the operation of the operation display circuit shown in FIG. In FIG. 1, two parts of the device similar to those in FIG. 3 are given the same reference numerals. For clarity, the relays (hereinafter referred to as
An operation display circuit for a protective relay device having three relays will be explained.

Display 1 to display the operation of each relay 1.2.3
1.12.13 operation display holding circuit 8 that holds the lights on;
9.10 is set by the output of AND gates 5 and 6.7, which are output when the operation outputs of the respective relays 1 and 2゜3 and the trip command from the trip command circuit 4 are established, and are displayed. Keep the device lit and reset 1-
When this happens, the display will turn off and turn off. These operation display holding circuits 8.9.10 are reset by the output of an OR circuit (hereinafter referred to as OR gate) 15 having two inputs.

One input is a display return command from the display return command circuit 14 that operates the push button switch of the protective relay device as in the conventional case.
The other input is a one-shot circuit 16 that receives a trip command from the trip command circuit 4 and outputs an output for a predetermined period of time.
An inverting circuit (hereinafter referred to as NOT gate) 1 that outputs an output when the breaker reclose circuit 17 is not activated.
This is the output of AND gate 19 which inputs the output of 8.

The operation of the operation display circuit having the above configuration will be explained using the time chart shown in FIG.

([) When relay 1 is activated due to an accident in the power system.

The operational output of the relay 1 causes the trip command circuit 4 to output a 1~rip command to trip the breaker. At this time, the reclose circuit 17 is not activated, so NOT
The gate 18 is outputting, and when the one-shot circuit 16 that inputs the trip command outputs for a predetermined period of time, the AND gate 19 resets each operation display holding circuit 8, 9, and 10, and the display 11. 12.
At t, 3, the light goes out. After that, when the re-closing circuit 17 is activated, the output of the NOT gate 18 disappears and the AND gate 1
The output of 9 will also disappear. At this time, the operating output of relay 1 and 1
Since the helip command has been established, the operation display holding circuit 8 is turned on by the AND gate 5, and the display 11 is turned on.

(II) When the relay 2 operates while the reclose circuit 17 is activated.

The 1-rip command is output from the trip command circuit 4, and the one-shot circuit 16 outputs an output for a predetermined time, but the N O'r gate 18 does not output while the re-closing circuit 17 is activated, so the AND gate 19 This is not true, and the operation display holding circuits 8, 9, and 10 are not transferred to the cellar 1. At this time, the operation output of relay 2 and the trip command are established, so the AN
The operation display holding circuit 9 is set by the D gate 6,
The display 12 lights up.

(III) After that, when the indicators 11 and 12 are kept lit and the relay 3 is operated with the breaker being re-closed by the re-closing circuit 17.

In this case, the re-closing circuit 17 is not activated (the NOT gate 18 outputs an output, and the operation output of the relay 3 causes the trip command circuit 4 to output a trip command to trip the breaker. Since the one-shot circuit 16 outputs an output for a predetermined period of time according to the command, the AND) gate 19 is established and the operation display holding circuits 8, 9, and 10 are reset. Therefore, the indicators 11, 12, and 13 are all turned off. After that, when the reclose circuit 17 is activated, N
The output of the OT gate 18 disappears, and the AND gate 19 no longer holds true. At this time, since the operation output of the relay 3 and the trip command are established, the operation display holding circuit IO is set by the AND gate 7 and the indicator [3 is lit.

As explained above, the operation of relays 1 and 2 from the first trip command until the breaker is re-closed is considered to be the same accident, and the operation indications of these relays 1 and 2 are maintained and the breaker is re-closed. The subsequent operation of relay 3 is a new/JX error, and is an operation display circuit of a protective relay device that updates the contents of the relay operation display to the operation display of relay 3, and will be described in each case (1) below.
- Perform similar operations in response to (1).

11 Although the above-mentioned embodiment is configured by hardware, it goes without saying that it is not limited to this and can also be realized by software.Also, it is possible to implement the protection of a busbar protection device, a transformer protection device, etc. that does not have a reclosing circuit 17. In the relay device, a similar operation can be achieved by inputting the output of the one-shot circuit 16 to the OR gate 15.

〔Effect of the invention〕

In order to update the operation display of the device, it is possible to obtain an operation display circuit for a protective relay device that can accurately display the operation of the relay.

[Brief explanation of drawings]

Figure 1 is an operation display circuit diagram of the protective relay device of the present invention, Figure 2 is a circuit diagram showing the operation of the protective relay device of the present invention.
The figure shows a time chart 1 of an operation display circuit, and FIG. 3 is a diagram of an operation display circuit of a conventional protective relay device. 1.2.3 ...Relay (relay) 4
...Trip command circuit 5.6, 7.19...Logic product circuit (AND gate) 8.9.10 ...Operation display holding circuit 11, 12.13 ...Indicator 15 ...Logic Sum circuit (OR gate) 1
6... One shock 1 to circuit 17
・・・Reclosing circuit 18 ・・・Inversion circuit (NOT gate) Agent Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 1 Figure 3

Claims (1)

[Claims] An operation display of a protective relay device having an operation display holding circuit that holds an indication of which operation output of a plurality of relays that operates upon detecting an accident in a power system causes a circuit breaker to trip. In the circuit, a first circuit that outputs an output for a predetermined time in response to a trip command to the shield breaker; a second circuit that outputs an output when the reclosing circuit of the shield breaker is not activated; and a third circuit that outputs a holding release command to the operation display holding circuit when the output of the second circuit is established.