A Novel Method to Improve the Fault Location Accuracy in Transmission Line Based on Data Fusion Technology

Fast and accurate fault location in transmission lines is important for the security of power system. Nowadays, different fault location algorithms are widely used in substations of power system. As fault location results of these algorithms are inconsistent, operators cannot analyze the conflicting results quickly and precisely, which influences fast restoration of fault. In this paper, based on multi-sources data fusion technology, a novel method to improve the fault location accuracy was proposed by using the fault location results from distance relays installed in two ends of transmission line. The method derived the fault location results and electrical signals from distance relays and fault recorders. Data fusion of weighting coefficient was used to fuse the two fault location results via analytical derivation in order to get a higher accuracy result. The proposed method was verified through EMTDC simulation and field data. The results show that the method can improve the fault location accuracy based on available information in substations. The method does not require extra equipment investment and is not affected by data asynchronization, fault resistance, load current and fault inception angle. It is proved to be economical and practical.