华电技术 ›› 2010, Vol. 32 ›› Issue (5): 41-43.

• 技术交流 • 上一篇    下一篇

继电保护装置中电流互感器的抗饱和措施

周欢荣1,陈琦1,李炳军1,宋云2   

  1. 1.国电南京自动化股份有限公司,江苏南京210003;2.南京泽明电子有限公司,江苏南京210003
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-05-25

easures for preventive saturation of current transformer in relay protection devices

ZHOU Huanrong1, CHEN Qi1, LI Bingjun1, SONG Yun2   

  1. 1.Guodian Nanjing Automation Corporation Limited, Nanjing 210003, China; 2.Nanjing Zeming Electronic Corporation Limited, Nanjing 210003, China
  • Received:1900-01-01 Revised:1900-01-01 Published:2010-05-25

摘要: 在35kV以上的电力系统及大中型发变机组中,故障短路电流通常包含2个分量:一个是按工频变化的周期性分量,另一个是随时间逐渐衰减的非周期性分量(有时也称为直流分量)。故障电流的这种性质特别容易使保护设备中的二次CT产生饱和,而出现误动或拒动。对电流互感器的饱和过程及其原因进行了分析,提出了相应的防止措施,提高保护可靠性。

关键词: 继电保护, 电流互感器, 非周期性分量, CT饱和

Abstract: In the power system and the large or medium generator transformer set with the voltage level higher than 35kV, the short circuit fault current often includes two components: one of them is the periodic component with the power frequency, and the other is aperiodic component, which is damped along with time (it called direct current component sometimes). This characteristics of the fault current are easily to cause saturation of the secondary windings of CT in protection devices, and further cause the protection incorrectly tripping or refusing to trip. The process and the reason of CT saturation were analyzed, and relevant protective measures were put forward, and the reliability of the protection was enhanced.

Key words: relay protection, current transformer (CT), aperiodic component, CT saturation