JPS58204717A - Protecting relaying device - 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 [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 the protective relay device include a failure of the main relay itself and a failure of the inspection control circuit itself. Therefore, an inspection function is added to the inspection circuit for the purpose of distinguishing whether the same inspection defect is a defect in the main relay or a defect in the inspection control circuit. Additionally, in general, when all inspection defects are detected, an alarm is issued to the outside as a device defect, and the device is locked.

Hereinafter, an example of a conventional inspection circuit will be explained using FIGS. 1 and 2. In Fig. 1, 1 is an inspection start command, 2 is a trigger lock confirmation signal during inspection, 3 is an inspection control circuit, and 4
is the main relay, 5 is the inspection failure detection signal, 6 is the inspection normality detection signal, 7 is the return command from the outside, 11 is the inspection reset command, and 14 is the auxiliary that locks the trip circuit until the reset command is issued during inspection. Relay 15 is an auxiliary relay for external alarm in the event of inspection failure, and 16 is an auxiliary relay that continues to detect all inspection failures and locks the trip circuit until a return command is issued from the outside. FIG. 2 shows a circuit breaker tripping circuit, where p and N are control power busbars, 14b is a normally open contact of the auxiliary viscometer 14 in FIG. 1, and 16b is the auxiliary relay 16.
18 is an auxiliary relay for confirming trip lock during inspection, and 19a is a normally open contact that closes or closes when the main relay operates in the event of a system fault.

First, in order to prevent mistakes 1-1, 1, and f caused by the operation of the main relay during inspection in Fig. 1, the auxiliary relay 14 for trip lock during inspection is operated by inspection start command 1, and the auxiliary relay 14 for the trip lock during inspection is activated. The closed contact 14b is opened. When the normally closed contact 14b is opened, the auxiliary light electric device 18 which is in operation at peak times returns to its normal state, fully 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 this inspection control circuit 3, an inspection input is given to the main relay 4,
Check that the main relay operates normally and that the main relay returns when the inspection input is turned off. Check the above-mentioned operation and recovery of each device, and if all respond normally, there is a defect judgment circuit built in the inspection control circuit 3. The inspection control circuit 3 is reset by the reset command 11, and the auxiliary relay 14 for trip lock during inspection is reset and its normally closed contact is closed, so that the protective relay device is activated. returns to the state before the inspection.

Next, if it is detected that one of the main relays is malfunctioning or has not reset properly, the auxiliary relay 16 for trigging and resetting at the time of malfunctioning is activated by the output of the malfunction signal °5. The normally closed contact 16b becomes open and locks the trip circuit.

At this time, the auxiliary relay 15 is activated by the inspection failure signal 5 and 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 to complete the inspection. becomes. Note that the operation of the trip lock caused by the auxiliary relay 16 and the operation of the auxiliary viscometer 15 for external alarm, which were activated due to an inspection failure, continues even after the completion of the switching, and can be restored by a return command 7 from the outside.

[Problems with background technology]

In the above-mentioned conventional device, the system will be locked in response to either a faulty inspection of the main relay or a faulty 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. Furthermore, if the inspection circuit itself is defective, immediately shutting off the circuit will cause trouble to the system operation.

[Purpose of the invention]

The present invention has been made with the aim of solving all of 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 only when the main relay itself is defective, a fault is detected. The purpose of this invention is to provide a protective relay device that can be locked.

(5) [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 normal. If the inspection is determined to be defective, 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.
If this is normal, the inspection control circuit is reset and the trip lock is restored, but if the inspection is defective, the main relay block is completely defeated due to a defect in the main relay, and an alarm to that effect is displayed externally. However, the trip lock and warning display will continue even after the inspection is completed.

[Embodiments of the Invention] Embodiment 1 will be explained below with reference to the drawings. Fig. 3 is a block diagram of one embodiment of the protective relay device according to the present invention, and Fig. 3 (,) shows the inspection of the inspection control circuit! This is a lock configuration diagram, and FIG. 3(b) is a block configuration diagram for performing a door inspection of the main relay.

(6) In Fig. 3, 8 is an inspection circuit inspection failure signal, 9 is an inspection circuit inspection normal signal, 10 is a signal that locks the inspection input to the main relay only during inspection circuit inspection, 12 is a main relay inspection failure signal, 13 is a main relay inspection normal signal, 17 is an auxiliary relay for external v-reporting when a defective inspection circuit is detected, and the rest is the same as in FIG.

Next, the operation will be explained with reference to FIG. 2 regarding the tripping circuit. In Fig. 3(a), inspection start command 1
, the main relay inspection input lock signal 10 is output, locking the inspection input to the main relay, and checking the inspection control circuit 3.
is activated and the inspection circuit is inspected, and only the function check of the inspection circuit is performed. At this time, the trip lock is not implemented because it does not have any effect on the protective function section.

If the inspection control circuit 3 is found to be defective, the inspection circuit inspection failure signal 8 is output, the auxiliary relay 17 is activated, and a full inspection circuit failure alarm is output to the outside. This restoration of the auxiliary relay continues until a restoration command 7 is generated from the outside. In addition, since the reset command 11 is output by the inspection circuit inspection failure signal 8, the inspection control circuit 3 is automatically reset.
will be reset, the inspection will end here, and the main relay will not be inspected.

Next, if the inspection circuit is normal, an inspection reset command 11 is output by the inspection circuit inspection normal signal 9, and the main relay inspection input lock signal 10 is reset and the inspection control circuit 3
will be reset once and the influence of the inspection circuit inspection will be cleared. At the same time, the inspection circuit inspection normal signal 9 activates the auxiliary relay 14 that performs trip locking while the main relay is being inspected, and the normally closed contact 14b of the auxiliary relay 14 shown in FIG. 2 opens to lock the trip circuit. The normally closed contact 14 described above
By opening the circuit b, the auxiliary relay 18 for trip lock confirmation, which is always operating, returns to its original state, and the trip lock confirmation signal 2 shown in FIG. 3(b) is output.

This trip lock confirmation signal 2 activates the inspection control circuit 3 again, inspects the main relay, and provides an inspection input to the main relay 4 to ensure the operation and recovery of the main relay.

Check the operation and recovery of all main relays, and if they all respond normally, check control (main relay inspection normal signal 13 is output from a defect judgment circuit (not shown) built in 9H path 3.
The inspection control circuit 3 is output by the inspection reset command 11.
is reset, and the tri-lag lock phase auxiliary relay 14 is restored during main relay inspection. When the auxiliary relay 14 is restored, its normally closed contact 14b is closed, and the protective relay device returns to the state before the inspection.

Next, if it is detected that even one of the main relays is malfunctioning or malfunctioning, the main relay inspection failure signal 12 is output, and the trip lock auxiliary relay 16 and external alarm due to the main relay inspection failure are output. Auxiliary relay 15
The normally closed contact 16b performs a trip lock and outputs a warning to the outside that the main relay is defective. At the same time, the inspection reset command 11 is output to 1 due to the main relay inspection failure signal 12, the inspection control circuit 3 is reset, and the divine assistant relay 14 for trip locking during the main relay inspection returns to 9, thus completing the inspection. If the main relay is not properly inspected in step (9), 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 trip lock is maintained by the trip lock auxiliary relay 16 in order to prevent the circuit breaker from completely tripping due to malfunction of a defective main relay. and auxiliary relay 1
The return in step 5.16 is performed by a return command 7 from 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. There is no need to worry about carrying out inspections and inspections at any time.

〔Effect of the invention〕

As explained above, according to the present invention, in a protective relay device equipped with an automatic inspection device, when an inspection failure occurs, it is determined whether the inspection circuit itself is defective or the main relay itself is defective, and if the inspection circuit itself is defective, The structure is configured such that only an external alarm is provided without a trip lock, and the external alarm and trip lock are activated only when a defect is detected, so even if the inspection circuit is defective, the protection function continues as normal. It is important to be able to operate the equipment and to minimize the impact on equipment operation.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram showing a conventional inspection circuit, Fig. 2 is a tripping circuit, and Fig. 3 is a functional diagram of an inspection circuit for a protective relay device according to the present invention. 3(b) is a diagram showing an inspection of the inspection control circuit, and FIG. 3(b) is a diagram showing an 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... - Felling command, 8...Inspection circuit inspection failure signal, 9...Inspection circuit inspection normal signal, 10...Main relay inspection input lock signal, 11...Inspection reset command, 12...Main Relay inspection failure signal,
13... Main relay inspection normal signal, 14... Nesuke side electrical device for trilag lock, 16... Auxiliary relay for trip lock, 17... Auxiliary relay for external alarm. Patent applicant Tokyo Shibaura Electric Co., Ltd.

Claims (2)

[Claims] (1) In a protective relay system equipped with an automatic inspection device that inspects the inspection control circuit and the main relay based on an inspection start command, the main relay is inspected on the condition that the inspection result of the inspection control circuit is normal. A protective relay device characterized in that the tripping circuit is locked only when the main relay has a defective inspection. (2) The protective relay device according to claim 1, wherein the inspection control circuit and the main relay are inspected independently and individually.