To find out the singularity of the high coefficients of fault signal, the method of searching modulus maxima is adopted and realized the precise rangefinder fault. Through the simulation platform of MATLAB, the power cable fault system simulation model is established and obtaind the cable faults fluctuations in the end. The relative error of different locations of the different faults simulation data is less than 4% , that shows that this method is feasible and accuracy.. At the same time a kind range finder formula is put forward and developed that doesn' t include wave velocity v. That makes the calculation of the fault distance to dispense the affect from wave velocity theoretically.%采用搜索模极大值的方法,进而实现故障的精确测距.通过MATLAB仿真平台,建立了电力电缆故障系统的仿真模型,得出电缆故障波形图.不同位置的不同故障的仿真数据相对误差均小于4％,验证了该方法的可行性和准确性.同时提出并推导一种不包含波速v的测距公式,使得在计算故障距离从理论上摆脱了波速对测距结果的影响.
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