华电技术 ›› 2014, Vol. 36 ›› Issue (7): 39-41.

• 技术交流 • 上一篇    下一篇

一起10kV线路保护误动事件分析

  

  1. (国网晋城供电公司,山西晋城〓048000)
  • 出版日期:2014-07-25 发布日期:2014-09-23

Analysis on a false trip accident of 10kV line protection

  1. (State Grid Jincheng Power Supply Company, Jincheng 048000, China)
  • Online:2014-07-25 Published:2014-09-23

摘要: 摘要:针对某110kV智能变电站10kV线路保护误动事件,通过检查保护装置、二次回路并分析现场录波文件后,确定误动原因为保护交流电流采样异常,采样异常的原因为交流插件未插紧而产生浮空电压,最后提出了相应的防范措施。

关键词: 关键词:智能变电站, 线路保护, 误动, 交流采样, 插件, 浮空电压

Abstract: Abstract:Aiming at the false trip accident of the 10kV line protection in an 110kV intelligent substation, the protection devices and the secondary circuit were inspected, and the site record files were analyzed. It was determined that the reason of the false trip accident is abnormity of the AC current sampling of the protection, and the reason of the abnormal AC current sampling is looseness of the AC plugin components, which causes floating voltage in circuit. At last, the relevant preventive measures were proposed.

Key words: Keywords:intelligent substation, line protection, false trip, AC current sampling, plugin component, floating voltage