华电技术 ›› 2010, Vol. 32 ›› Issue (6): 30-34.

• 研究与开发 • 上一篇    下一篇

发电机不完全差动误动原因分析

王贵来   

  1. 构皮滩发电厂,贵州余庆564408
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-06-25 发布日期:2010-06-25

Reason analysis of malfunction of incomplete differential protection for a generator

WANG Guilai   

  1. Goupitan Hydropower Station, Yuqing 564408, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-06-25 Published:2010-06-25

摘要: 差动保护作为发电机的主保护,能否正确动作直接影响到主设备的安全和系统的稳定运行。分析了发电机不完全差动误动的原因,指出差动用电流互感器励磁特性变差是差动保护误动的根本原因。

关键词: 差动保护, 电流互感器, 原因分析, 防范措施

Abstract: The differential protection is main protection for generator, and if it can act correctly will directly influence on the security of the main equipment and the stable operation of the system. The reasons of the malfunction of the incomplete differential protection of a generator were analyzed; and it is pointed out that the basic reason of malfunction of differential protection is the deterioration of the excitation characteristics of the current transformer used in differential protection circuit.

Key words: differential protection, current transformer (CT), reason analysis, preventive measure