【摘要】 对T型高压输电线路的行波故障测距方法进行了研究,利用T型高压输电线路的三端故障行波测量数据,使用互相关函数的改进方法——单位脉冲响应法求取两两端的信号时延。提出故障分支判别的新判据,根据双端行波测距原理实现T型线路的故障测距。针对相关分析过程中可能出现的伪相关峰问题,利用能量比法对三端故障行波的首波头进行大致的时延估算,并以此为参照缩小相关峰的查找范围,提高了时延估算的可靠性。仿真结果表明该方法正确,且具有较高的测距精度,在较大的环境干扰下可以实现T型线路的分支判别和故障测距。更多还原

【Abstract】 Travelling wave fault location of Teed circuits is studied.By using three terminals fault travelling wave measurement data of the Teed circuits,an improved algorithm of cross-correlation function which is called unit impulse response method is proposed to get the signal time delay of each two terminals.Based on whicha new criterion is proposed for fault branch distinguishing,and thenfault location for Teed line is realized by using two-terminal travelling wave fault location theory.In respect of pseudo correlation peaks possibly occurred in correlation analysis,the possible delayestimation of initial wave of three-terminal fault travelling wave can be gotten by using energy ratio treatment.By reference to this estimation,searching area ofcorrelation peaks are reduced,thus the time delay estimation accuracy can be raised.The ATP/EMTP simulation results show that this method is correct and has very good location accuracy.And inthe case of large environment random disturbance,this method canrealize the fault line selection and fault location for Teed circuits.更多还原