华电技术 ›› 2015, Vol. 37 ›› Issue (4): 19-21.

• 研究与开发 • 上一篇    下一篇

电流互感器二次回路端子松动故障分析

  

  1. (1.中国电力工程顾问集团中南电力设计院,武汉〓430071; 2.西安热工研究院有限公司,西安〓710032;3.许继集团有限公司,河南许昌〓461000)
  • 出版日期:2015-04-25 发布日期:2015-06-02

Analysis on fault of loose connection of terminals in secondary circuit of current transformer

  1. (1.Central Southern China Electric Power Design Institute, Wuhan 430071, China; 2.Xi′an Thermal Power Research Institute Company Limited, Xi′an 710032, China; 3.XJ Group Corporation, Xuchang 461000, China)
  • Online:2015-04-25 Published:2015-06-02

摘要: 摘要:描述了一起电流互感器二次回路接触不良导致发电机差动保护误启动的事故经过,通过电流互感器电路模型对电流互感器二次绕组开路过电压产生的机制进行了分析,并在实验室进行了电流互感器二次开路试验,定性验证了过电压与一次电流的关系。最后给出了排查电流互感器二次回路接触不良的几种方法。

关键词: 关键词:电流互感器, 二次回路, 过电压, 差动保护, 误启动, 接触不良

Abstract: Abstract:A false trip accident of generator differential protection, which was caused by poor contact of secondary circuit of current transformer, was described. Using the circuit model of current transformer, the mechanism of overvoltage fault caused by opencircuit of secondary winding of current transformer was analyzed. The opencircuit test of secondary circuit of current transformer was carried out in laboratory. The relationship between the overvoltage and the primary current was verified qualitatively. At last, several methods to check the poor contact of secondary circuit of current transformer were given.

Key words: Keywords:current transformer, secondary circuit, overvoltage, differential protection, false trip, poor contact