基于光纤时间同步的双端行波故障测距方法

针对传统双端行波测距技术中线路双端时钟需精确对时的问题,将双端行波测距方法与光纤通信技术相结合,提出了一种基于光纤时间同步的双端行波故障测距新方法。该方法首先利用小波模极大值理论检测故障初始行波到达线路两端的时刻和极性,并根据极性判断故障线路;然后,在故障初始行波到达线路两端后,经光纤通道分别向对端发射脉冲信号,利用相关算法自动检测脉冲信号到达对端的时刻,并根据光纤通道传输时延确定故障初始行波到达线路两端的绝对时刻;最后根据双端测距方法确定故障距离。仿真结果验证了该方法的可行性。研究成果具有较高的工程应用价值。

Double Terminal Traveling Wave Fault Location Method Based on Time Synchronization of Optical Fiber

For the traditional double ended traveling wave ranging technology, the two terminal clock of the line needs precise timing. A new double-ended traveling wave fault location method based optical fiber time synchronization was proposed by combining the double-ended traveling wave ranging measurement with the optical fiber communication technology. First, the wavelet modulus maxima theory was used to detect the time of reaching the two ends of the line and polarity of the initial traveling wave, and the fault line was judged according to the polarity. Then, after the initial traveling wave of the fault arrives at both ends of the line, the pulse signal was transmitted to the opposite end by the optical fiber channel, and the correlation algorithm was used to automatically detect the time when the pulse signal reaches the opposite end. According to the transmission delay of the optical fiber channel, the absolute time of the initial traveling wave to reach the ends of the line was determined. Finally, the fault distance was determined by the dual end range method. The simulation results verify the feasibility of the method. The research results have high engineering application value.