Analysis of DC Bias Suppression Method of the Large Transformer's Neutral Series Capacitor and Its Effect on Relay Protection

doi:10.11930/j.issn.1004-9649.2017.07.164.05

Abstract

Abstract: HVDC power transmission system that works in monopole or bipolar asymmetric operation mode generates neutral current which causes transformer DC magnetic biasing and in turn influences safe and stable operation of transformer and AC systems. Taken a 500 kV substation as example, the capacitor connected in series to transformer neutral can suppress DC biasing. However, it also changes transformer zero sequence and behavior of zero-sequence current relay and distance relay. Theoretical analysis of relay protection is performed and analysis results are verified by simulation. The results show that small capacitor connected in series to the neutral point of station transformer has no influence on relay protection performance.

Key words: transformer's neutral, DC bias, ADPSS simulation, relay protection

CLC Number:

TM403.5

WANG Ting, ZHANG Kanjun, WEN Bo, CHEN Kun. Analysis of DC Bias Suppression Method of the Large Transformer's Neutral Series Capacitor and Its Effect on Relay Protection[J]. Electric Power, 2017, 50(7): 164-168.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.07.164.05

https://www.electricpower.com.cn/EN/Y2017/V50/I7/164

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