纵联零序方向保护零序弱馈拒动的改进方案及其仿真  

Improvement on Pilot Zero Sequence Directional Protection to Avoid Miss Operation Due to Zero Sequence Weak-infeed and Its Simulation

作　　者：刘浩[1] 韦芬卿[2] 俞波[1] 戴列峰[1] 苏理[1] 姚吉文[1] 伍小刚[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏省南京市210061 [2]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003

出　　处：《电力系统自动化》2009年第22期75-78,共4页Automation of Electric Power Systems

摘　　要：线路发生接地故障时,两侧零序阻抗相差过大将导致两侧零序电流差别过大,虽然两侧的零序方向元件均能正确动作,但是由于一侧零序电流达不到动作定值,从而造成纵联零序方向保护拒动。文中针对这种零序弱馈现象的产生进行了仿真分析,并且提出了针对零序弱馈的纵联零序方向保护的改进方案,进行了验证。实时数字仿真试验结果表明该方案解决了零序弱馈时的纵联零序保护拒动问题,有效改善了纵联接地保护的性能。When ground faults occur on transmission lines, other if there is a significant difference between the zero zero sequence currents of both ends will be very different from each sequence impedance of both ends. Pilot zero sequence directional protection may fail to operate because the zero sequence current on one end does not reach the set value of the protective relay, although zero sequence directional elements on both ends operate correctly. This paper performs a simulation analysis on the phenomenon of zero sequence weak-infeed and an improved scheme of pilot zero sequence directional protection is proposed to address this problem. The result of real time digital simulation demonstrates that the improved scheme can handle the miss operation problem due to the phenomenon of zero sequence weak-infeed and effectively improve the performance of pilot ground fault protection.

关 键 词：零序方向 弱馈 纵联保护 

分 类 号：TM773[电气工程—电力系统及自动化]