浅谈变电站站用变低压侧零序CT的正确接线方式

高士涛<sup>1</sup>; 贾 炜<sup>1</sup>; 朱 莹<sup>2</sup>

引用本文:	高士涛,贾炜,朱莹.浅谈变电站站用变低压侧零序CT的正确接线方式[J].电力系统保护与控制,2007,35(22):57-57,60.
	GAO Shi-tao,JIA Wei,ZHU Ying.Connection of zero-order CT in lower voltage side of substation type transformer[J].Power System Protection and Control,2007,35(22):57-57,60

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浅谈变电站站用变低压侧零序CT的正确接线方式
高士涛¹, 贾炜, 朱莹²
1.１.河南送变电建设公司,河南郑州 450051;2.２.河南省郑州供电公司,河南郑州 450006

摘要:

主要介绍了变电站站用变低压侧零序CT常见的错误接线方式，并根据故障时零序电流的方向和大小进行分析，说明这种错误接线方式在故障产生时造成的严重后果。由此提出了正确的接线方式，即零线和接地线同时穿过零序CT，并进行了故障状态下的分析，证明了接线的正确可靠性。

关键词: 零序CT 中性线零序电流保护

DOI：10.7667/j.issn.1674-3415.2007.22.014

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Connection of zero-order CT in lower voltage side of substation type transformer

GAO Shi-tao¹, JIA Wei, ZHU Ying²

1.Henan Electric Power Transmission & Transformation Construction Corporation, Zhengzhou 450051,China;2.Henan Zhengzhou Power Supply Company, Zhengzhou 450006, China

Abstract:

This paper lists out some ordinary wrong connection ways of zero-order CT in lower voltage side of substation type transformer, and analyses the zero-sequence current’s direction and magnitude when the zero-order current fault.The serious results caused by wrong connection is proposed.Based on which, this puts forward the right connection way which is connected the ground connection and null line to the zero-order CT at the same time. And also it analyzes the fault situation to prove the stability of this connection way.

Key words: zero-order CT neutral line zero-sequence current protection

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