T-Shaped Transmission Line Fault Location Based on Phase-Angle Jump燙hecking

Abstract

In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location, a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in this paper. Firstly, the 3-terminal synchronous fundamental positive sequence voltage and current phasors are extracted and substituted into the fault branch distance function to realize the selection of fault branch when the fault occurs; Secondly, use the condition of the fundamental positive sequence voltage phasor at the fault point is equal to calculate all roots (including real root and virtual roots); Finally, the phase-angle jump check function is used for checking calculation, and then the only real root can be determined as the actual fault distance, thereby achieving the purpose of high-precision fault location. MATLAB simulation results show that the proposed new algorithm is feasible and effective with high fault location accuracy and good versatility. KEYWORDST-shaped transmission line; fault location; real root and virtual roots; phase-angle; jump check function

Multi-Branch Fault Line Location Method Based on Time Difference Matrix Fitting

“…Based on the fault locations and types shown in Fig. 1, we used the method proposed in reference [27] to locate the faults. The fault location results obtained from both reference [27] and our method are displayed in Fig.…”

“…1, we used the method proposed in reference [27] to locate the faults. The fault location results obtained from both reference [27] and our method are displayed in Fig. 9, with the x-axis representing the fault points and the y-axis indicating the corresponding fault location results.…”