基于函数幅值和线路等分法的双端故障定位研究

Two-terminal Fault Location Method Based on Amplitude of Function and Line Equal Partition

由于恶劣天气、外力破坏、绝缘老化、鸟害等原因,输电线路发生短路故障的概率很高。为了准确地找到故障位置和加快线路修复,提出了一种采用电压、电流数据的双端故障定位方法。该方法基于线路两侧不同步数据采用均匀传输线方程推导出新的故障定位函数,利用函数的幅值特性和线路等分法得到具体故障点或搜索范围。最后,MATLAB仿真与计算结果表明,提出的故障定位方法简单易行,定位结果(故障点和搜索范围)符合现场实际巡线需求,能克服过渡电阻和线路两侧数据不同步的影响,适用于各种短路故障类型。

The high probability of transmission line short circuit fault is due to bad weather,external damage,insulation agingand bird damage. In order to accurately locate the fault location and speed up line repair,this paper proposed a twoterminalfault location method using voltage and current data. In this method,the uniform transmission line equation was used to derive anew fault location function based on the unsynchronized data on both sides of the line,and the specific fault point or searchingrange was obtained by the amplitude characteristic of the function and line equal partition method. At last,MATLAB simulationand calculation results show that the proposed fault location method is simple and easy by meeting the linesearching needs,thelocated result（fault point or searching range）can overcome transition resistance and the unsynchronized data on both sides ofthe line,and is applicable to all kinds of short circuit fault type.