JPS6082020A - Device for inspecting current difference 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] [Carcass Field of the Invention] The present invention relates to an inspection device for a current differential relay device, in particular, to a certain electric station (hereinafter referred to as a main electric station), which applies a check current and performs this inspection. This invention relates to an inspection device for a current differential relay device that inspects a current differential relay using current and voltage supplied from the bus bars of each electric station.

[Technical background of the invention]

FIG. 1 shows an example of the phase characteristics of a current differential relay, and shows that the relay operates when, for example, the phase relationship between the zero-sequence voltage V and the zero-sequence current (2) falls within the shaded range. Here, the method of inspecting a current differential relay will be exemplified by a two-terminal system of a display wire relay device.Although various inspection methods can be considered, in order to simplify the explanation, a method of inspecting an inflow at one end will be explained.

First, a check current is applied from the main electrical station, and this check current and
The width voltage that can be supplied from the bus bars of each electrical station that is approximately in phase is applied to the current differential relay, and if the phase relationship between the current and voltage is within the shaded range in Figure 1, it is determined that the main electrical station is included. ,
It is common to check that the current differential relays at multiple electrical stations are working. In this case, as described above, by matching the phases of the inspection current I and the voltage V at each electric station, it is possible to check the operation of the current differential relay at each electric station.

[Problems with background technology]

Next, we will explain the problem in which current differential relays cannot be inspected using this inspection method.

In FIG. 2, Δ and dan represent each electric station.

Subscripts A and B are attached to the devices installed at electric station A (hereinafter referred to as A end) and electric station B (hereinafter referred to as B end), respectively. LA and IB are bus lines, 2 is a transmission line connecting the buses,
3A and 3B are circuit breakers.

4A and 4B are current transformers, which input the terminal current of the power transmission line. 5A and 5B are current differential relays,
Reference numerals 6A and 6B are voltage transformers, which input the terminal voltage of the bus bar. Reference numeral 7 is a display line and a transmission path for transmitting and transmitting signals.

In the system shown in Figure 2, if end A is the main electrical station for inspection, when breaker 3A at end A or breaker 3B at end B is OFF, the system at end A and end B is OFF. Consider the case where there is no interconnection. Inspection current ＾ is A=7a
Current differential relay 5A-＼At the same time as input, display line 7
The current is also supplied to the B-end differential relay 5B through the
Voltage is supplied from each bus to voltage transformers 6A and 6B, voltage vA is supplied to the current differential relay 5A at the A end, and voltage VB is supplied to the current differential relay 5B at the B end. Therefore, for example, B
When the breaker 3B at the end is OFF, the grid is not connected, so the phase of the inspection current A and the voltage VB supplying the current differential relay 5B at the B end may be significantly shifted. be. In this case, the current differential relay 5A at the A end can operate because the inspection current IA and the voltage VA are almost in phase, but the current differential relay 5B at the B end does not operate even if the inspection input is applied. This problem occurs.

Next, the conventional inspection circuit shown in FIG. 3 will be explained.

・In Fig. 3, ST is an inspection start signal given to a timer that determines the cycle of visual inspection. During automatic inspection, this signal is used to activate the trigger circuit lock relay via the relay driver 31. T works. When the normally closed contact Tb is opened by the operation of this relay T, a trip circuit lock confirmation signal U is issued from the AND gate 32, the step circuit 33 is started, and an inspection step signal Si is generated.
Let 5i=S1. The inspection input application circuit 34 applies an inspection input to the inspection target relay RY, which is the inspection target device 35, based on the signal from the inspection Stella fs1. As a result, when the relay to be inspected RY1 operates, the AND condition of the inspection step signal S1 and the operation signal RY in the AND gate 36 is established, and the operation confirmation signal 2 is generated from the AND dart 36, thereby confirming the inspection input of RY1. Cut. As a result, the relay to be inspected RY is restored, and the output of the AND gate 36 is also restored.

In response to the operation confirmation signal from the or dirt 37, the step circuit 33 performs the inspection step S1 and starts the relay to be inspected ('(Y
After confirming that , is operating and has returned, proceed to the next inspection step S2. In the above, if the relay to be inspected RY malfunctions, the AND gate 3
If the operation confirmation signal is not transmitted from 6 and there is a failure in recovery, the output of AND gate 36 becomes a continuous signal. Therefore, if these desk plates occur, the step circuit 33 does not proceed to the next inspection step S2. Therefore, if the stepping circuit 33 does not step for a predetermined period of time or more, it is determined to be defective and the inspection failure detection circuit 38 generates an output. Also, if all inspection steps 81 to Sn are good,
The inspection step is S n +1.

This disconnects the inspection circuit and resets the trip circuit locking relay T.

The inspection circuit operates as described above, but if the inspected device 35 in this circuit is a current differential relay and the electrical station where it is installed is at the idle end, the operation will be as follows. That is, in accordance with the signal of the inspection step S1, an inspection input is applied to the relay to be inspected RY4, which is the device to be inspected 35, and one current differential relay. However, as mentioned above, if the phase of the inspection current and the inspection voltage are significantly out of phase, this relay will not be able to operate, even though it may be due to a defect in the current differential relay itself, and the operation confirmation signal will be sent from the AND gate 3. 2 is not sent, so
The step circuit 33 does not proceed to the next inspection step S2. As a result, since the step circuit 33 does not step for more than one foot time, it is determined to be defective, and the inspection defect detection circuit 38 generates an output. As mentioned above, this is because the inspection input is not being supplied correctly, and is not a defect in the undercurrent differential relay itself. Therefore, this problem can be solved by not carrying out inspections when a certain electrical station is at an idle end.

[Purpose of the invention]

The present invention was made with the aim of solving the above-mentioned problems, and involves applying an inspection current from the main electrical station to inspect the current differential relays of multiple electrical stations including the main electrical station. The inspection equipment does not perform an inspection of the differential current relays at the electrical station that has lost connection with the main electrical station, but only inspects the differential current relays at the electrical station where the interconnection is established. The purpose of the present invention is to provide an inspection device for a current differential relay device.

[Summary of the invention]

The present invention provides a detection signal when the inspection circuit cannot be interconnected, for example, an AND dart of the idle end signal and the inspection step signal of the current differential relay, so that when the electrical station becomes the idle end, the current The differential relay is not inspected and the system advances to the next inspection step.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 4 is a circuit configuration diagram of an embodiment of a current differential relay device inspection device according to the present invention. The device to be inspected 45 is a current differential relay. As explained above, if the stain spot is at the end of rest, the next inspection step is not carried out, resulting in a defective inspection.

Therefore, by the inspection step S1 of the device to be inspected 45 and the AND/DART 49 of the rest end signal, the step signal W is sent to the step circuit 4.
3, it is possible to proceed to the next inspection step S2 without inspecting the current differential relay (RY1), which is the device to be inspected 45. Hikoo,
The other operations are the same as those of the conventional example described above, and will therefore be omitted. Actual current differential relay devices are composed of relays with other functions, such as undervoltage relays, so if the electrical station becomes idle, inspection of the current differential relays should be carried out. Although it is not possible, it is possible to inspect relays, etc. that have different functions. Although the above explanation has been made for a two-terminal system, it goes without saying that it can also be applied to a protective relay device for a multi-terminal system. Further, in the above description, a display line is used as a transmission means, but a microwave terminal device and a microwave circuit may also be used.

〔Effect of the invention〕

As explained above, according to the present invention, in a current differential relay device equipped with an automatic inspection device, even if a certain electrical station is at the idle end, inspection failures are often caused, and the reliability is high. We can provide inspection equipment for protective relay devices.

[Brief explanation of drawings]

Fig. 1 is a phase characteristic diagram of a differential current relay, Fig. 2 is an inspection outline diagram of a current differential relay device, Fig. 3 is a block diagram showing a conventional inspection circuit, and Fig. 4 is a current left side diagram according to the present invention. FIG. 1 is a configuration diagram of an embodiment of an inspection device for a dynamic relay device. 81~S n, Sn+1...Inspection step, U.
...Lock confirmation signal, 31, 41...Relay driver, T...Trip circuit lock relay, Tb...
・Relay contact for trip circuit lock, 32.36,42
, 46.49...AND gate, 37.47...OR gate, 33.43...Step circuit, 38.48...Inspection failure detection circuit, 34',' 44...Inspection input application circuit, 35.4
5...Device to be inspected, St...Inspection step signal, 2...Operation confirmation signal, W...Step signal. (7317) Agent Patent Attorney Noriyuki Chika (and 1 others)
given name)

Claims (1)

[Claims] The current differential relays installed at each end electrical station mutually transmit and receive signals according to the amount of electricity at each end via the transmission line, and the self-end and the other end are connected by supplying inspection current from the inspection end electrical station side. In an inspection device for a current differential magneto-electric device configured to be able to inspect the current differential magneto-electric device, if the connection between one end and the other end is established, the inspection current and the voltage at each end are used to check the current differential relay at each end. The current differential is characterized in that it is possible to check both sides, and if the connection between the own end and the other end is not broken, it is possible to check only the point where the connection is broken. Inspection device for relay equipment.