Timely location and treatment of faults encountered by transmission lines are of great significance to reduce eco-nomic losses and ensure stability of transmission system.The uncertainty of propagate velocity of traveling wave in trans-mission lines often leads to significant errors in fault location when using traveling wave method.In order to improve ran-ging accuracy,this paper proposed a traveling wave fault location method independent of wave speed.First high-frequency signal of the fault voltage traveling wave is obtained by extracting line mode component of the initial voltage traveling wave using wavelet transform.Then the wavelet modulus maximum method is used to denoise high-frequency signals.Finally polarity of the modulus maximum is used to determine time consumption of fault voltage traveling wave for reaching the measurement end and calculate the fault distance.MATLAB/Simulink simulations show that the proposed ranging method is independent of wave speed and accurate.
traveling wave methodwave velocityfault typefault locationmodulus maximum
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