摘要
全面对比分析了全电流比例差动判据和故障分量电流比例差动判据的灵敏性和安全性。确认了故障分量电流差动判据在灵敏性上优于全电流差动判据,并指出全电流判据在某些特殊工况下如系统振荡中发生故障时可能存在长延时的拒动。当外部故障较大,穿越电流造成 CT 饱和时,故障分量电流差动判据的安全性也优于全电流差动判据。
The sensitivity and the security of the percentage differential criteria using phase current and superimposed phase current are studied comparatively. It is confirmed that the superimposed based criterion is better than phase current based one in terms of sensitivity. A possible fail-to-trip scenario of the protection using phase current based criterion is disclosed as well the protection using phase current based criterion possibly fails to trip if an internal fault occurs during power swings. In the occasion of the CT saturation due to the high through current in the event of external faults, the superimposed based criterion is more stable in comparison with the one using phase current.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第10期27-31,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50177011)~~
关键词
故障分量
电流比
判据
差动
CT饱和
拒动
灵敏性
振荡
确认
Electric power engineering
Power system
Differential relay
Phase current based percentage differential criterion
superimposed current based percentage differential criterion
