全电流与故障分量电流比例差动判据的比较研究  

COMPARATIVE STUDIES ON PERCENTAGE DIFFERENTIAL CRITERIA USING PHASE CURRENTAND SUPERIMPOSED PAHSE CURRENT

作　　者：林湘宁[1] 刘沛[1] 

机构地区：[1]华中科技大学电力工程系,湖北武汉430074

出　　处：《中国电机工程学报》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)~~

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.

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 

分 类 号：TM772[电气工程—电力系统及自动化] TM452