Analysis and Countermeasures on a Malfunction of Zero-Sequence Directional Protection Due to Mutual Inductance

doi:10.11930/j.issn.1004-9649.2016.05.059.04

Abstract

Abstract: A high frequency zero-sequence directional protection of a 220 kV line took false action with obvious distortion on voltage waveform. Through harmonic analysis of voltage waveform, it is found that CVT transient characteristics lasted shortly around 5~10 ms, while zero-sequence directional protection acted 20 ms later. The possibility of malfunction caused by transient characteristics of CVT is excluded. Based on zero-sequence voltage, current and sequence on both sides of protection, the induced voltage is calculated. It is inferred that mutual inductance is the cause of malfunction of zero-sequence directional protection. A new zero-sequence directional protection scheme with negative sequence current opening identification is proposed.

Key words: zero-sequenced directional protection, transient characteristics, CVT, mutual inductance

CLC Number:

TM774

CHEN Shuiyao, , HUANG Shaofeng, YANG Songwei. Analysis and Countermeasures on a Malfunction of Zero-Sequence Directional Protection Due to Mutual Inductance[J]. Electric Power, 2016, 49(5): 59-62.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.05.059.04

https://www.electricpower.com.cn/EN/Y2016/V49/I5/59

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