Automatic adjustment method for series compensation asymmetrical operation circuit backup zero-sequence protection constant value

Abstract

The invention discloses an automatic adjustment method for a series compensation asymmetrical operation circuit backup zero-sequence protection constant value. The automatic adjustment method comprises the following steps 1, a circuit protection apparatus collects a system operation signal in real time, and judges whether the system enters a series compensation asymmetrical operation state or notin a circuit no-fault condition; and 2, when it is judged that the system enters the series compensation asymmetrical operation state in the circuit no-fault condition, the circuit protection apparatus performs automatic adjustment on the zero-sequence final section protection action constant value so as to adapt the operation state. Preferably, in the step 1, the circuit protection apparatus collects the protection action signal of the circuit, the protection action signal of the other set of dual-configured circuit, a series compensation protection action signal and a series compensation bypass switch position signal in real time. Manual intervention is not needed, and circuit mistake removal caused by inaccurate circuit protection action due to the asymmetrical operation state of seriescompensation can be prevented, and the overall automatic performance of the system is improved and the action performance can be ensured.

Description

technical field [0001] The invention relates to a method for automatically adjusting the fixed value of the back-up zero-sequence protection of a series compensation asymmetrical operation line. Background technique [0002] With the rapid development of EHV and UHV power grids and the interconnection of regional power grids, the application of long-distance and large-capacity EHV transmission lines is becoming more and more extensive. There are a lot of applications in the line. When the series compensation is in an asymmetric operation state, a certain proportion of zero-sequence current will appear in the transmission line, which may cause the backup zero-sequence protection action of the line protection, thus causing the entire line to be disconnected by mistake. Since the transmission line with series compensation generally has a high transmission load and is also of high importance, misoperation has a great impact on the reliability of the system power supply. [000...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a method for automatically adjusting the setting value of the backup zero-sequence protection of the series compensation asymmetrical operation line, which makes full use of the relevant information of the system and solves the problem of abnormal operation of the line protection in this case of malfunction

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