电力系统自动化2009，Vol.33Issue(14)：61-65,5.
基于相角差的发电机定子接地保护方向元件
Directional Element Based on Phase-angle Difference for Generator Stator Grounding Protection
摘要
Abstract
The third-harmonic voltages at the generator neutral and the terminals, and the phase angle relationship between fundamental frequency zero-sequence voltage and zero-sequence current under different single-phase grounding faults are analyzed. According to that, a phase-angle difference direction element for generator stator grounding fault protection is presented. It consists of two parts: for fault location less than 50% of stator winding from neutral point, the direction function is based on the phase comparison of the third-harmonic voltages at the generator neutral with that at the terminals. But it cannot detect the ground fault direction near the generator terminal (for fault location larger than 50～ of stator winding from neutral point), which can be determined by the phase comparison of the fundamental frequency zero-sequence voltage with fundamental frequency zero-sequence current. Research results show the direction element can detect stator grounding faults with high sensitivity and accuracy.关键词
3次谐波零序电压/基波零序电压/零序电流/定子接地保护/方向元件/故障分量Key words
third-harmonic voltage/ fundamental frequency zero-sequence voltage/ zero-sequence current/ stator grounding protection/ directional element/ fault component分类
信息技术与安全科学引用本文复制引用
涂崎,邰能灵..基于相角差的发电机定子接地保护方向元件[J].电力系统自动化,2009,33(14):61-65,5.基金项目
国家自然科学基金资助项目(50577042),上海市教委曙光计划资助项目(07SG11) （50577042）
新世纪优秀人才支持计划资助项目(NCET-08-0356). （NCET-08-0356）
