Research on Fault Location for Single-core Power Cable of Auxiliary Power Supply System of EMU Based on Adaptive Threshold Segmentation
Accurate positioning in the case of failure of single core power cables,as one of the channels for energy trans-mission in the auxiliary power supply system of electric multiple units(EMU),is of paramount importance in mainte-nance procedures.Currently,the widely adopted method for cable fault location is the time-frequency domain reflectome-try.However,the cross terms generated by time-frequency analysis limit the accuracy of fault location.Thus,Wigner-Ville distribution based on adaptive threshold segmentation was proposed in this paper.To begin,four types of fault sam-ples,namely low resistance,high resistance,open circuit and short circuit,were embedded into a 70-meter cable sam-ple.Subsequently,Wigner-Ville distribution transformation was used to process these detected signals to explain the rea-son for the cross terms generated,leading to the proposal of the Wigner-Ville distribution based on adaptive threshold segmentation to mitigate cross-term.Finally,a comparative evaluation was performed between the new method and exist-ing cross-term suppression methods.The results show that the proposed method that effectively eliminates cross-terms is applicable to both single-fault and multi-fault cable.The positioning error for single-fault location is below 0.80％and that for dual-fault is less than 0.40％,validating the effectiveness of the method presented.
cable insulationdefect and fault locationtime-frequency reflectometrycross term elimination
万方数据
维普
