基于跨线故障判别的平行双回线路选相方案  

Fault Phase Selector of Protective Relay for Cross Country Fault on Double Circuit Lines

作　　者：杨忠礼 宋国兵[2] 姚永峰 梁振锋[2] 索南加乐[2] 

机构地区：[1]新乡供电公司,河南新乡453002 [2]西安交通大学电气工程学院,西安710049

出　　处：《西安交通大学学报》2011年第2期97-101,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50877061);国家自然科学基金重点资助项目(51037005)

摘　　要：针对相电流差选相元件在平行双回线首端发生跨线故障时会误选相的问题，提出了基于故障分量方向元件的选相方案．将平行双回线路跨线故障作为复故障，分析了相电流差选相元件在线路首端跨线故障时误选相的原因．在故障被判为跨线故障的情况下，利用电压元件选出故障相，对每一回线，利用故障分量方向元件判断对应相故障是否在本回线路内部，当故障分量电压与故障分量电流问的相角在0。～180。时，判故障在本回线内，从而选出每回线的故障相．EMTP仿真结果表明，该方案在各种跨线故障下均能正确选相，可直接应用于现有基于单回线信息的微机保护装置．Aiming at the misoperation of the conventional phase selector by phase current-differential during some cross country faults, a fault phase selector for double circuit lines on the same tower using fault superimposed components direction element is developed, where the cross country fault of double circuit lines is considered as multiple faults of single circuit lines to analyze the misoperation of conventional phase selector. The new scheme selects fault phase by fault superimposed component voltage, and the fault lines of the corresponding fault phase are selected with fault superimposed component direction element. If the phase angle between faults superimposed component voltage and current of either double circuit line is in the range of 0°-180°, the fault is in the line. The EMTP simulation results show that the proposed scheme is applicable to micro- computer-based protection.

关 键 词：平行双回线路 跨线故障 选相元件 方向元件 复故障 

分 类 号：TM771[电气工程—电力系统及自动化]