JPH0145805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a protective relay device, and particularly to a protective relay device equipped with an automatic inspection device.

[Technical background of the invention]

Generally, in a fully stationary protective relay device, an automatic inspection device is usually added for the purpose of improving reliability. Inspection failures of protective relay devices include failures in the main relay itself and failures in inspection due to failures in the inspection control circuit itself. So, even if it is the same inspection defect, is it a defect in the main relay?
An inspection function is added to the inspection circuit for the purpose of distinguishing whether the inspection control circuit is defective or not. In addition, in general, when a defective inspection is detected, an alarm is issued to the outside as a defective device, and the device is trip-locked.

An example of a conventional inspection circuit will be described below with reference to FIGS. 1 and 2. In Fig. 1, 1 is an inspection start command, 2 is a trip check confirmation signal during inspection,
3 is an inspection control circuit, 4 is a main relay, 5 is an inspection defect detection signal, 6 is an inspection normal detection signal, 7 is a return command from the outside, 11 is an inspection reset command, and 14 is a trip until a reset command is issued during inspection. An auxiliary relay that locks the circuit; reference numeral 15 is an auxiliary relay for external alarm in the event of an inspection failure; 16 is an auxiliary relay that continues operation in the event of an inspection failure; the auxiliary relay locks the trip circuit until a return command is issued from the outside. FIG. 2 shows a circuit breaker tripping circuit, in which P and N are control power bus bars, 14b is a normally closed contact of the auxiliary relay 14 in FIG. 1, 16b is a normally closed contact of the auxiliary relay 16, and 18
is an auxiliary relay for checking the trip lock during inspection,
19a is a normally open contact that is closed by the operation of the main relay in the event of a system fault.

First, in order to prevent mistrips due to the operation of the main relay during inspection in FIG. 1, the auxiliary relay 14 for trip locking during inspection is operated by inspection start command 1, and the normally closed contact 14b in FIG. 2 is opened. When the normally closed contact 14b is opened, the auxiliary relay 18, which is always in operation, returns to its original state, detects that the trip circuit is locked, and outputs the trip lock confirmation signal 2. Therefore, in FIG. 1, the inspection control circuit 3 is activated when both the conditions of the inspection activation command 1 and the trip confirmation signal 2 are satisfied. By starting the inspection control circuit 3, a check input is applied to the main relay 4, and it is confirmed that the main relay operates normally and that the main relay returns when the check input is cut off. Here, the above-described operation and recovery of all the main relays to be inspected are confirmed, and if all respond normally, a signal 6 indicating normal inspection is output from the defect judgment circuit built in the inspection control circuit 3, and a reset command 11 is issued. As a result, the inspection control circuit 3 is reset, and the auxiliary relay 14 for trip locking during inspection is restored, and its normally closed contact is closed, so that the protective relay device returns to the state before the inspection.

Next, when it is detected that one of the main relays is malfunctioning or has failed to recover, the auxiliary relay 16 for trip locking at the time of malfunction is activated by the output of the malfunction signal 5, and its normally closed contact is activated. 16b becomes an open circuit and locks the trip circuit. At this time, the auxiliary relay 1 is activated due to the inspection failure signal 5.
5 is started, an alarm is displayed to the outside, and the inspection control circuit 3 and the auxiliary relay 14 for trip lock during inspection are restored by the inspection reset command 11, and the inspection is completed. The trip lock caused by the auxiliary relay 16 and the operation of the auxiliary relay 15 for external alarm, which were activated due to an inspection failure, continue even after the inspection is completed, and can be restored by a return command 7 from the outside.

[Problems with background technology]

In the above-mentioned conventional device, the trip lock is performed in both cases of failure of inspection of the main relay and failure of the inspection circuit. However, if the main relay is normal and only the inspection circuit is defective, the protective relay device will be able to respond normally to a system fault, and there will be no problem if it is maintained and operated as is. There isn't. Moreover, in the event that the inspection circuit itself is defective, immediately triggering a trip block will cause problems for system operation.

[Purpose of the invention]

The present invention was made with the aim of solving the above problems, and detects whether the main relay itself is defective or the inspection circuit itself is defective in the event of an inspection failure, and performs a trip lock only if the main relay itself is defective. The purpose of the present invention is to provide a protective relay device that can obtain

[Summary of the invention]

In the present invention, the inspection of the inspection circuit and the inspection of the main relay are separated, and the main relay is inspected only when the inspection circuit is found to be normal. If this is the case, an alarm is displayed to the outside and the inspection operation ends, but if it is normal, a trip lock is performed and the main relay is inspected, and if it is normal, the inspection control circuit is reset. However, if the inspection is defective, the trip lock will be restarted due to a malfunction in the main relay, and an alarm will be displayed to that effect to the outside, and the trip lock and alarm display will continue even after the inspection is completed. It is.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. Third
The figure is a block diagram showing one embodiment of the protective relay device according to the present invention, and FIG. 3a is a block diagram showing the structure for inspecting the inspection control circuit. FIG. 3b is a block diagram for inspecting the main relay.

In Fig. 3, 8 is the inspection circuit inspection failure signal;
9 is a normal inspection signal for the inspection circuit; 10 is a signal that locks the inspection input to the main relay only during inspection of the inspection circuit;
12 is a main relay inspection failure signal, 13 is a main relay inspection normal signal, and 17 is an auxiliary relay for external alarm when a defective inspection circuit is detected, and the other components are the same as in FIG.

Next, the operation will be explained with reference to FIG. 2 regarding the tripping circuit. In Fig. 3a, the main relay inspection input lock signal 1 is activated by the inspection start command 1.
0 is output, locking the inspection input to the main relay, and activating the inspection control circuit 3 to carry out an inspection of the inspection circuit, and only checking the function of the inspection circuit. At this time, the trip lock is not executed because it does not have any effect on the protection function section.

If there is a defect in the inspection control circuit 3, an inspection circuit inspection defect signal 8 is output, the auxiliary relay 17 is activated, and an inspection circuit defect alarm is output to the outside. This restoration of the auxiliary relay continues until a restoration command 7 is generated from the outside. or,
Reset command 11 due to inspection circuit inspection failure signal 8
is output, the inspection control circuit 3 is automatically reset, the inspection ends here, and the inspection of the main relay is not carried out.

Next, if the inspection circuit is normal, an inspection reset command 11 is output by the inspection circuit inspection normal signal 9, the main relay inspection input lock signal 10 is reset, and the inspection control circuit 3 is temporarily reset, and the inspection circuit inspection is performed. Clear the influence. At the same time, the auxiliary relay 14, which executes the trip lock during the main relay inspection, is activated by the inspection circuit inspection normal signal 9.
Normally closed contact 14b of auxiliary relay 14 in FIG. 2 opens to lock the trip circuit. By opening the above-mentioned normally closed contact 14b, the auxiliary relay 18 for confirming the trip lock, which is always operating, returns to its original state, and the trip lock confirmation signal 2 shown in FIG. 3b is output.
This trip lock confirmation signal 2 activates the inspection control circuit 3 again to carry out an inspection of the main relay, and provides an inspection input to the main relay 4 to confirm the operation and recovery of the main relay. The operation and recovery of all main relays is confirmed, and if all respond normally, a main relay inspection normal signal 13 is output from a defect judgment circuit (not shown) built in the inspection control circuit 3, and an inspection reset command 11 causes the inspection control circuit 3 to output a normal inspection signal 13. is reset, and the auxiliary relay 14 for trip locking during inspection of the main relay is reset. When the auxiliary relay 14 is restored, its normally closed contact 14b is closed, and the protective relay device returns to the state before inspection.

Next, if it is detected that even one of the main relays is malfunctioning or has not returned properly, the main relay inspection failure signal 12 is output, and the auxiliary relay 16 for trip lock and the external alarm relay due to the main relay inspection failure are output. The auxiliary relay 15 is activated to perform a trip lock using the normally closed contact 16b, and
Outputs a main relay failure alarm to the outside. At the same time, an inspection reset command 11 is outputted by the main relay inspection failure signal 12, the inspection control circuit 3 is reset, and the auxiliary relay 14 for trip-locking during the main relay inspection is restored, thereby completing the inspection. If the main relay is not properly inspected, the external alarm auxiliary relay 15 and the trip lock auxiliary relay 16 due to the main relay's defective inspection continue to operate even after the inspection is completed. The reason why the trip lock is continued by the auxiliary trip lock relay 16 is to prevent the circuit breaker from mis-tripping due to malfunction of a defective main relay. and auxiliary relays 15, 16
The return is performed by a return command 7 from the outside.

In the above embodiment, after confirming that the inspection result of the inspection circuit is normal, the main relay is automatically inspected. However, the invention is not limited to this. It goes without saying that the inspections may be carried out separately.

〔Effect of the invention〕

As explained above, according to the present invention, in a protective relay device equipped with an automatic inspection device, it is determined whether the inspection circuit itself is defective or the main relay itself is defective in the event of an inspection failure, and if the inspection circuit itself is defective, The system is configured so that only an external alarm is activated without a trip lock, and the external alarm and trip lock are activated only when a failure is detected in the main relay, so the protection function can be operated normally even in the event of a failure in the inspection circuit.
It is possible to minimize the impact on equipment operation.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing a conventional inspection circuit, Fig. 2 is a tripping circuit, Fig. 3 is a functional block diagram of an inspection circuit of a protective relay device according to the present invention, and Fig. 3a is an inspection control circuit. Figure 3b is a diagram showing the inspection of the main relay. 1...Inspection start command, 2...Trip lock confirmation signal, 3...Inspection control circuit, 4...Main relay,
5...Inspection failure signal, 6...Inspection normal signal, 7...
...Return command, 8...Inspection circuit inspection failure signal, 9...
...Inspection circuit inspection normal signal, 10...Main relay inspection input lock signal, 11...Inspection reset command, 1
2...Main relay inspection failure signal, 13...Main relay inspection normal signal, 14...Auxiliary relay for trip lock, 15...Auxiliary relay for external alarm, 16...
Auxiliary relay for trip lock, 17... Auxiliary relay for external alarm.

Claims (1)

[Claims] 1. In a protective relay device equipped with an automatic inspection device that inspects the inspection control circuit and the main relay based on an inspection start command, provided that the inspection result of the inspection control circuit is normal. A protective relay device characterized in that it is configured to inspect a main relay and locks a lead-out circuit only when the main relay is defective in inspection. 2. The protective relay device according to claim 1, characterized in that the inspection of the inspection control circuit and the inspection of the main relay are carried out independently and individually.