小電阻接地系統(tǒng)線路零序保護(hù)拒動(dòng)原因分析 

武冠英 
(無錫供電公司，江蘇 無錫 214000) 
 

摘 要： 根據(jù)小電阻接地方式下的零序保護(hù)原理，介紹了小電流接地系統(tǒng)零序保護(hù)不動(dòng)作的原因，分析了一起線路零序保護(hù)由于存在保護(hù)死區(qū)致使故障范圍擴(kuò)大的案例，通過對如何防止零序保護(hù)拒動(dòng)問題進(jìn)行探討，提出了相應(yīng)的反事故措施及其對策，為防止線路零序保護(hù)死區(qū)故障，建議其零序電流采用三相電流互感器合并而成，并制定有針對性的保護(hù)定值調(diào)整方案，為設(shè)備安全穩(wěn)定運(yùn)行提供保障。
關(guān)鍵詞： 小電阻接地；線路保護(hù)；零序保護(hù)；死區(qū)；保護(hù)拒動(dòng)
中圖分類號：TM645 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2014)07-0036-05

Zero Sequence Protection Action Refusal Cause Analysis of Small Resistance Grounding System 

WU Guan-ying 
（Wuxi Power Supply Company, Wuxi 214000, China） 
 

Abstract: According to the zero sequence protection principle under the small resistance grounding method, this paper introduced the zero sequence protection action refusal cause of small resistance grounding system and analyzed a case of line zero sequence protection due to existing of protection dead zone leading to fault range expansion. This paper discussed how to prevent the zero sequence protection action refusal problem from taking place and raised the corresponding fault countermeasures. In order to avoid dead zone faults of line zero sequence protection, this paper suggests that the zero sequence current should be merged in three-phase current transformer and the protection setting value adjustment scheme should be set down to provide insurance for safe and stable operation of equipment.
        Key words: small resistance grounding; line protection; zero sequence protection; dead zone; protection action refusal

參考文獻(xiàn)
[1] 徐志恒.淺析10 kV小電阻接地系統(tǒng)線路零序保護(hù)改進(jìn)[J].科技與企業(yè)，2013，8(4)：2-3.
[2] 張芬.小電阻接地系統(tǒng)的繼電保護(hù)[J].云南電力技術(shù)，2001，38(8)：61-63.
[3] 吳玉龍，楊惠林，霍忠峰.小電阻改造中一次電纜屏蔽線和電流互感器安裝時(shí)注意的問題[J].天津電力技術(shù)，2008(3)：24-25.
[4] 賀家李，宋從矩.電力系統(tǒng)繼電保護(hù)原理[M].北京：中國電力出版社，2004.