电流互感器相间电流互串对差动保护的影响  

Current Transformer Phase-to-phase Current Interaction Impact on Differential Protection Schemes

作　　者：袁宇波[1] 伍雪峰[1] 邓洁清[1] 李修金[1] 黄浩生[1] 高磊[1] 

机构地区：[1]江苏省电力试验研究院有限公司,江苏省南京市210036

出　　处：《电力系统自动化》2010年第21期65-69,共5页Automation of Electric Power Systems

摘　　要：针对母线差动保护、线路差动保护在区外故障时出现不正确动作,其共性特征为某一相出现故障,差流出现在其他相,且为特征很明显的不平衡毛刺电流的现象,文中对此进行了理论分析,得到此类误动与电流互感器二次回路的相间汲出(分流互串)相关的结论。理论研究揭示了此类误动中存在的非故障相毛刺电流方向和故障相电流极性相反、毛刺电流幅值大、持续时间短等共性特征产生的机理。经建模仿真分析、实验室模拟实验以及大量故障录波波形特征规律研究,验证了理论分析的正确性,并提出了相应的解决措施。When maloperation of bus differential protection or line differential protection occurs with external fault,the associated characteristics are that one phase fault and the differential current existing on other phases is unbalanced.This paper analyzes this phenomenon in greater depth.It can be concluded that this type of maloperation is related to the phase-to-phase current interaction of current transformer secondary circuit.The error current of normal phase and current of fault phase have different directions.The error current is featured with large amplitude and short duration.Analysis with simulation,laboratory experiment and recorded fault waveforms verify the correctness of the proposed analytical method.The corresponding solutions are given as well.

关 键 词：差动保护 区外故障 电流互感器 相间电流互串 误动 

分 类 号：TM452[电气工程—电器]