JPS61189120A - 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] [Technical Field of the Invention] The present invention relates to a protective relay device equipped with a reclosing device.
In particular, it relates to improving the function of reclosing circuits.

[Technical Background of the Invention] In recent years, multi-terminal systems have been planned for trunk power transmission lines as well, and protective relay devices that protect these systems are designed to mutually transmit the amount of current and voltage obtained from each terminal, A current differential relay device or the like that performs dynamic determination is used. In this case, it is necessary to perform an operation that involves stopping the breaker, etc. at which terminal of each terminal (two or more terminals), and it is necessary to notify the other terminals that the terminal is to be treated as inactive. Open/close information is transmitted between the terminals.

Further, it is common for the protective relay device to include a re-closing device. In this reclosing method, the leading end and the trailing end are often treated in consideration of the secondary effects of reclosing on power equipment and the grid.

This point will be explained in detail below. FIG. 4 shows a configuration in which a two-terminal system is protected by a protective joint type device. In the figure, A and B are electrical stations at each end. 1 is a power transmission line, which is interconnected by circuit breakers 2A and 2B.

3A and 3B are protective relay devices equipped with reclosing circuits, and current, voltage information, and opening/closing information of the circuit breakers 2A and 2B are sent to each other via transmission devices 4A and 4B. 5 is a line voltage transformer, and 6 is an undervoltage relay, which are installed for use in a reclosing closing condition circuit, which will be described later.

In the figure, electric station A is the leading end of the reclosing circuit, and electric station B is the trailing end.

Figure 5 shows the reclosing circuit installed at Electrical Station B. In the figure, 11 is a circuit breaker reclosing condition circuit, which determines whether or not the circuit breaker can be reclosed. Reference numeral 12 denotes a re-closing starting circuit, which is started by a breaker disconnection command of the protective relay and generates an output. 13 is an AND gate,
14 is a holding circuit that stores the output from the AND gate 13 until an input command or final cutoff, which will be described later. 15
is a timer for detecting reclosing no-voltage time, and holding circuit 1
An output is generated when the output of 4 continues for t. Therefore, at this time, if the reclosing interconnection conditions for performing reclosing are established, the grid interconnection condition circuit 16 outputs an output, and the AND gate that will be described later generates an output without voltage. 24, a closing command is issued to the breaker via the AND gate 17. 18 is a timer for detecting reclosing abandonment time, which is set to t<t2 and generates an output when the output of the holding circuit 14 continues for t, 2;
Generates final cutoff command. Reference numeral 19 denotes an OR gate, which uses the output of the NO gate 17 or the timer 18 for detecting reclosing abandonment time to control the holding circuit 14 and the holding circuit 2 to be described later.
Generates a reset output at 3. Reference numeral 6 denotes the undervoltage relay shown in FIG. 1, and when the voltage of each phase of the power transmission line 1 decreases, the output signal (R, S, , T) is output. 20 is an OR gate,
21 outputs an output from the holding circuit 14 and the OR gate 20 to a timer 22 for line no-voltage detection. The undervoltage relay 6 confirms that there is no voltage on the line for a period of ta, and the timer 22
emits an output, and this output is held in the holding circuit 23. A
The ND gate 24 outputs an output from the NOTOR gate 20, which outputs when the holding circuit 23 and the OR gate 20 do not output, that is, when the line voltages in all three phases are healthy. The reason is that the opening of the breaker at each terminal due to the reclosing start is confirmed by the operation of the undervoltage relay installed on the line side, and then the breaker is re-closed at the leading end. This takes into account the confirmation of no voltage at the line-to-gate, which is determined by the non-operation of the voltage relay, as the re-closing condition.

[Problems with Background Art] As is clear from the above description, at the trailing end, it is necessary to install an undervoltage relay on the line side to meet the re-closing conditions. In addition, in electrical stations where a voltage transformer is not required on the line side due to the protection system, the installation of the voltage transformer is required as it becomes the trailing end of the reclosing circuit, resulting in a significant increase in equipment costs.

[Object of the Invention] The present invention has been made with the aim of solving the above problems, and provides a protective relay device that can fully perform the function of the reclosing trailing end without adding an undervoltage relay. is intended to provide.

[Summary of the invention] In the present invention, it is confirmed that the breaker at the other end has been opened for a certain period of time based on the opening/closing information of the breaker transmitted from the other end, and then, the re-closing condition is set that the breaker has been closed. The structure is designed to take into account the following.

Embodiments of the Invention] Examples will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a protective relay device to which the present invention is applied, and the symbols in the figure correspond to those in FIG. 4, and the line voltage transformer 5 and undervoltage relay 6 in FIG. This is a necessary configuration.

FIG. 2 shows a circuit for detecting the opening/closing information of a breaker to which the present invention is applied, and detects the opening/closing status of each of the three phases of the breaker 2A shown in FIG.
CBX-2, CBX-3) Receive Te. CBX-1, CB
X-2, CBX-3 (7) each/? (7) I work 1
The contact information of 1i, 1 becomes logic signals CBX-IASCBX-2A, CBX-3A via the buffer circuit 41. Each /r CBX-1, 2°-6=3 is "0" when open, and "1" when open. This signal CB
X-IA, -2A, -3A are transmitted to B electric station via a transmission device.

In addition, here, the description will be made assuming that the A electric station is the leading end of the reclosing circuit, and the B electric station is the trailing end.

FIG. 3 is a reclosing circuit of an embodiment of the protective relay device according to the present invention, showing the trailing end. The symbols in the figure correspond to those in FIG.

CBX-IA, CBX-2A, CBX-3A c, CBX-IA, CBX-2A, CBX- shown in Figure 2
3A1. m corresponds. In other words, it is the opening/closing information of the circuit breaker transmitted from the A electric station, and each of the CBX-1 and CBX-1 of the A electric station
2, 3 It is rOJ when closed, and becomes a signal [1] when opened. C
BX-IA, CBX-2A, and CBX-3A are connected to OR gate 20. The other configurations are the same as in FIG. 5.

Next, the operation shown in FIG. 3 will be explained. Power transmission line 1 in Figure 1
For example, if a one-wire failure of the R phase occurs, the circuit breaker 2A
, 2B's R phase opens, and CBX-1 in FIG. 2 returns. As a result, the logic signal CBX-IA becomes "1",
This signal is transmitted to electric station B via the transmission device shown in FIG. 4A. On the other hand, at electric station B, the signal is transmitted to the reclosing circuit provided in the protective relay device 3B, ie, FIG. 3, via the transmission device shown in FIG. 1, 4B. At this time, in the reclosing circuit shown in FIG. An output is issued to the timer 15 and the NO gate 21. CBX-IA is "1", the OR gate 20 outputs an output, and the output from the holding circuit 14 outputs an output to the line no-voltage detection timer 22 via the AND gate 21. CBX
-IA is "1", that is, CBX-1 of A electric station is ta
Upon checking the time, the timer 22 issues an output, and this output is held by the holding circuit 23. After that, electric station A, which is the leading end, turns on the circuit breaker again, and the CBX-
1 works. This causes the logic signal CBX-18 to become “0”.
”, and the CBX-IA of electrical station B in Figure 3 also becomes “0”. CBX-1A, -2A, -3^ are all "0"
”, the output of the OR gate 20 disappears and NO
The T gate 25 outputs an output, and the output is output from the holding circuit 23 to the AND gate 17 via the AND gate 24. Therefore, if the reclose circuit no-voltage time detection timer 15 and grid connection condition circuit 16 are outputting outputs at this time, a closing command is issued to the breaker via the AND gate 11.

On the other hand, if the time ta between the circuit breakers at electric station A is not confirmed, the holding circuit 23 does not operate. Furthermore, unless the circuit breaker is closed for all three phases due to the restart of the A power station, the NOT gate 25 will not output an output. In these cases, a final cutoff command is issued by the output of the timer 18 for detecting the reclosing abandonment time, and the holding circuit 14 is issued via the OR gate 19.
and 23 to disconnect the reclosing circuit.

Also, the breaker information at the other end in Figure 3 and the respective phases of the breaker at the own end are ANDed, and the OR conditions for each phase are ANDed.
It is also possible to input the signal to the D gate 21.

Although the above embodiment has been explained using a two-terminal system, it is of course applicable to a multi-terminal system having three or more terminals.

[Effect of the invention] -〇- As explained above, according to the present invention, the circuit breaker opening/closing information transmitted from the opposite end can be used to confirm the line-0 no voltage at the subsequent end of the reclosing circuit. Since this is configured to be confirmed using a circuit breaker, it is possible to eliminate the need for an undervoltage relay and a voltage transformer on the line side, which were conventionally used for re-closing conditions.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a protective relay device to which the present invention is applied, FIG. 2 is a circuit diagram for detecting open/closed states of a breaker to which the present invention is applied, and FIG. 3 is a diagram of a protective relay device according to the present invention. A reclosing circuit diagram of one embodiment, FIG. 4 is a block diagram showing a two-terminal system protected by a protective relay device, and FIG. 5 is a conventional reclosing circuit diagram. 1... Power transmission line 2^, 2B... Breaker 3A, 3B... Protective relay device 4A, 4B.
... Transmission device 5 ... Line voltage transformer 6 ... Undervoltage relay 11 ... Breaker reclose condition circuit 12 ... Reclose start circuit 13.17.21.24 ... AND gate 14 .23
...Holding circuit 15...Reclosing no-voltage time detection timer 16...Grid connection condition circuit 18...Reclosing abandonment time detection timer 19.20...
・OR goo 1~22...Line non-voltage detection timer 25...NOT gate CBX-1, CBX-2, CBX-3-...Auxiliary relay 41...Buffer circuit (7317) agent Patent attorney Kensuke Norichika (and 1 other person) [

Claims (2)

[Claims] (1) Each of the plurality of terminals is connected to each other via a breaker with a leading end and a trailing end at the time of re-closing, and a breaker trip command of the leading end and a re-closing condition fulfillment signal are connected to each other through a breaker. In a protective relay device equipped with a reclosing device that generates a closing command for the trailing end via a reclosing no-voltage detection timer, the leading end breaker is opened for a predetermined period of time after the leading end tripping command. a first circuit that detects and holds the leading end breaker; a second circuit that detects that the leading end breaker has subsequently closed based on breaker opening/closing information transmitted from the leading end; A protective relay device comprising: a third circuit that issues a closing command for a succeeding terminal under AND conditions of each circuit. (2) The protective relay according to claim 1, wherein the first circuit is configured to detect and hold that the leading end breaker and the trailing end breaker are open for a predetermined time. Electrical equipment.