JPS6096126A - Reclosing system - 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 reclosing method for reclosing a power receiving electric station that is not equipped with a busbar protection relay device.

[Technical background of the invention and its problems] A electric station 1 and B% i electric station 2 as shown in Fig. 1 are connected in parallel 2.
This section describes a power system system connected by lines.

This system turns on and off power to the bus 3 and transmission lines 8 and 9, which are charged from the upper system.
A protective relay device 6 (abbreviated as FLY in the figure) installed in the A electric station 1 that issues a shutdown command to the circuit breakers 4 and 5 in the event of an accident in the two circuit breakers 4 and 5; breaker 4 and breaker 5 cut off by 6
, a reclosing device 7 that gives a closing command depending on the conditions of the bus voltage and line voltage, a power transmission line 8 and a power transmission line 9 that supply power from electric station A 1 to electric station B 2, this power transmission line 8,
Line voltage and bus voltage for the circuit breaker 10, circuit breaker 11, bus bar 12 connected to these two circuit breakers, and these two circuit breakers 10111, which perform "on" and "q-off" of power supply from the power transmission line 9. 15.18.19 is PT+ and 16.17 is CT.In electric station B, 15.18.19 is PT+ and 21.22 is CT. is PT
It is.

The operation of the system is as follows.

When a fault occurs in the bus bar 12 of the B4 station 2 on the power receiving side, a fault current flows through the power transmission line 8 and the transmission line 9.

The protective relay device 6 of the electric station A 1 detects a system failure based on this fault current, outputs a disconnection command to the circuit breaker 4 and the circuit breaker 5, and isolates the A7 @ station 1 from the fault point F. .

At the same time, the reclosing device 7 receives a cutoff signal from the protective relay device 6 and starts up.

The electric station 2 is not equipped with a disconnect protection switch k, so the circuit breaker IO and the circuit breaker 11 are not disconnected due to an accident. −
The banko-closing device 13 detects the voltage of the power transmission line 9 and the bus bar 12, and after a certain period of time, the circuit breaker 10 and the circuit breaker 11
Gives a shutdown command (total shutdown) and starts the own device.

After a certain period of time has elapsed (after a no-voltage period) after startup, the reclosing device 7 in the Am electrical station 1 confirms that the voltage on the bus 3 is present, and gives a closing command to the circuit breaker 4 and the circuit breaker 5. When the voltage of the power transmission line 8 becomes "high", the re-closing device 13 in the B electric station 2 confirms that the closing conditions for the breaker 10 are met and issues a closing command to the breaker 10.

Now, if we assume that the fault on the busbar 12 is a permanent fault, the fault current will flow through the transmission line 8 again, the circuit breaker 4 will be cut off again by the protective relay device 6, and the B electric station 2 will once again experience a total power outage. , as described above, the reclosing device 13 is connected to the circuit breaker 1
Give a cutoff command to 0.

Similarly, when the voltage of the power transmission line 9 becomes "Pak", the reclosing device 13 in the B electric station 2 confirms that the closing conditions for the breaker 11 are satisfied and issues an instruction to the breaker 11.Here, now, Bus line 1
Accident No. 2 is a permanent accident, so a fault current flows through the transmission line 9 again, the circuit breaker 5 is cut off by the protective relay device 6, and the B electric station 2 suffers a total power outage for the third time, so it must be re-closed as described above. The abbreviation @13 gives a shutoff command to the circuit breaker 11.

In the above-mentioned system operation, unnecessary pressurization is ultimately applied to the accident point F twice, and the problem is that the electric shock given to the accident point F becomes large. However, there has been a desire for a recirculation device with a function to avoid this problem.

[Object of the Invention] The present invention was made with the aim of solving the above-mentioned problems, and provides a re-closing method with an added function of preventing unnecessary pressurization to the accident point in the event of a permanent accident. is aimed at something.

[Summary of the invention] In case of a permanent busbar accident, the signal receiver of the conventional reclosing device is equipped with a transfer circuit to lock the reclosing function of the adjacent circuit, thereby preventing unnecessary pressurization to the accident point. I made it possible.

[Embodiments of the Invention] Examples will be described below with reference to the drawings. In this embodiment, the parts corresponding to those in the conventional example are given the same reference numerals, and redundant explanations are omitted. The signal reception necessary to prevent unnecessary pressurization to the accident point is in the transfer circuit 1.
4 has been added.

I will explain one operation below.

The processing from the occurrence of a permanent busbar accident to the closing of circuit breaker 4 and circuit breaker 5 is the same as that described in (2) Technical background of the invention and its problems.

When the voltage of L power transmission line 8 becomes 9゛゛゛゜゛゛゛゛゛゛゛
The reclosing device 13 within the circuit confirms that the closing conditions for the breaker 10 are satisfied and issues a closing command to the breaker 10.

Here, the recirculation device 13 operates after outputting the closing command (breaker 1
By checking the voltage of the bus bar 12 (after 0 is turned on) with an undervoltage relay (not shown), etc. If the pressure 1' is zero, it is regarded as a permanent bus fault, and the circuit breaker 10 is shut off, and the signal receiver transmits the permanent bus fault detection information to the adjacent line through the transfer circuit 14, thereby locking the circuit breaker 11. .

[Effects of the Invention] As explained above, according to the present invention, in the event of a permanent busbar accident, the breaker 11 remains cut off without being closed, and unnecessary pressurization to the accident point F is not repeated, and the accident point It is possible to prevent electric shock by limiting the pressure to F only once.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a system to which a conventional reclosing device is applied, and FIG. 2 is a diagram showing an embodiment of the present invention. 1.2..." Electrical station 3... Bus bar in electrical station A 4.5... Breaker 6 in electrical station A...' Acceleration relay device in electrical station A 7... Reclosing device 8 in electric station A...IL power transmission line 9...2L feed line 10...breaker 11 in electric station B...breaker 12 in electric station B...Electricity Bus line in location B

Claims (1)

[Claims] Parallel two-line transmission between power source and receiving power stations
A protective relay device is connected to each line terminal of the power source side electrical station with a protective relay whose protection direction is the direction of current flowing from the terminal toward the power transmission line, and a protective relay device that activates in response to the protective operation of this protective relay device and performs a specified operation. After the no-voltage time, the line voltage is ``with'' and the transmission line voltage is ``with''.
A re-closing device is installed that gives a closing command to the circuit breaker when the condition is "No", and each terminal of the receiving power station receives the scheduled signal from the time when both the transmission line voltage and the bus voltage are "No". After the time limit, a disconnection command is given to the terminal breaker, and it is activated by this disconnection command, and the power line voltage becomes "present".
A re-closing device is installed that outputs a re-closing command to the terminal breaker at the time of the incident, and after the re-closing device operates, when the voltage on the receiving side bus is “no”, the re-closing device of the other line stops the re-closing function. A reclosing method characterized by being equipped with a device that gives commands.