Traveling-wave based fault location with high grounding resistance for HVDC transmission lines

The fault resistance of HVDC transmission lines is one of the sensitive and significant factors to affect the parameters of travelling wave and the performance of fault location. Therefore explicit fault location of high grounding resistance is proposed lines in this paper. S transform is applied to analyze travelling wave to demonstrate the characteristic and variation in time-frequency domain. The principle of type A and type D for fault location are applied into proposed algorithm by magnitude integral in frequency domain. The position of wave front in travelling wave can be identified accurately and as a consequence of it the time of which first arrived is affirmed to measure the distance of fault. In the end of paper a simulation provide the validation about accuracy and feasibility of this algorithm.