A novel location method for distribution hybrid lines

To solve effects of time synchronization problems in double-ended traveling wave location method and achieve exact identification of reflected wave crests in single-ended traveling wave location method, a novel location method is proposed in this paper. A preliminary fault location and approximate values of fault distance are calculated by double-ended principle firstly. Then fault point reflected waves' arrival time at both sides are calculated via using approximate values. Compared with theoretical time, a time error matrix is built and the value which is closest to zero is identified as the actual arrival time of fault point reflected wave. Finally, accurate location is accomplished based on the single-ended traveling wave principle. EMTP-ATP simulation results show that the proposed fault location method is feasible in hybrid lines and fault location accuracy is improved obviously.