电力系统自动化2016，Vol.40Issue(12)：165-171,7.DOI:10.7500/AEPS20151031003
平行线路跨线故障选相元件的动作分析
Analysis on Fault Phase Selector for Cross Country Fault of Parallel Transmission Lines
摘要
Abstract
Parallel transmission lines on the same corridor are commonly used in the transmission system.When a cross country fault occurs,the traditional fault phase selector may not correctly identify the fault phases due to the changes of fault characteristics.An algorithm for the calculation of the sequence currents at the fault point is proposed according to Thevenin”s theorem and the sequence currents at the location of the protection relay are obtained with superposition principle.Finally,the formulas on the relation between sequence currents at the fault point are deduced.Based on the double-circuit transmission lines on the same tower without electrical connection at both ends,it is found that the applicability of the positive and negative sequence current phase selector is related to fault types under cross country non-earth fault conditions,while that under cross country earth fault conditions are related to fault types,mutual inductance as well as the ratio of equivalent zero sequence impedance and positive sequence impedance.In contrast,the phase selector based on the phase current difference change can correctly identify fault phases under different cross country fault conditions of parallel transmission lines on the same corridor. Simulation results based on the PSACD platform show that the analytical method for cross country fault is effective,and the analysis result of fault phase selector is correct.关键词
平行线路/跨线故障/戴维南等效方法/选相元件/零序互感Key words
parallel lines/cross country fault/Thevenin”s equivalent method/fault phase selector/zero-sequence mutual inductance引用本文复制引用
徐海洋,宋国兵,樊占峰..平行线路跨线故障选相元件的动作分析[J].电力系统自动化,2016,40(12):165-171,7.基金项目
国家电网公司科技项目“同塔多回输电线路纵向故障保护防误动研究”。@@@@This work is supported by State Grid Corporation of China （）
