A backup protection optimization method for high-voltage line protection device blocking

Abstract

The invention discloses a backup protection optimization method for locking a high-voltage line protection device, which collects the blocking signal of the high-voltage line protection device at each line interval in a substation station and the DC power loss signal of the whole station protection; judges and triggers the corresponding voltage level according to the collected signal The line protection device in the station locks the signal and sends it to each protection device of the corresponding voltage level in the station; the line protection device in the non-blocking interval receives the blocking signal of the line protection device in the station and forwards it to the line protection device on the opposite side, and the line protection device on the opposite side in the non-blocking interval Receiving the blocking signal shortens the action time of the backup protection and increases a long backup distance protection. Realize the protection range and time coordination of backup protection, improve the speed of backup fault removal when the high-voltage line protection blocking interval fails, and avoid equipment damage and protection leapfrog action caused by long fault duration.

Description

technical field [0001] The invention relates to the field of electric power system relay protection, in particular to a backup protection optimization method for blocking of a high-voltage line protection device. Background technique [0002] As the construction of high-voltage transmission lines becomes more and more dense, it is becoming more and more difficult to achieve perfect coordination for the setting of line backup protection. Generally, mismatch points are selected for coordination and setting in places with weak connections, which will prolong the operation time of backup protection, such as the end of backup protection. Generally, it is more than 3s. At the same time, setting the protection range according to the near backup cannot guarantee the sensitivity of the adjacent first-level end fault. If the line protection in the substation loses power or is blocked by its own fault, the main protection will be lost in this bay. At the same time, there is no near bac...

AI Technical Summary

Problems solved by technology

However, after the protection is locked, according to the existing method, the backup protection may not move or move slowly, thereby expanding the fault range and threatening the security of network operation.

[0003] Aiming at the problem of protection lockout, the requirements of complete coordination and quick removal of faults cannot be solved from the traditional fixed value coordination method

One solution is to add a station domain protection device, and remove the fault after adding a backup to the station domain protection device, but in this way, if the entire station loses power, the operating mechanism will also lose power, so the fault cannot be completely removed

Another solution is to establish wide-area protection, which will increase the operating cost of the existing transformation, and at the same time need to establish a new channel, which will affect the reliability of the operation

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