A Method for Judging the Arc-Extinction Time of Resonant Grounding System Based on Frequence Difference

Abstract In the resonant grounding system, accurate judgment of arc-extinction time has guiding significance for line selection fault, evaluation arc suppression effect, and extraction utilization transient information after extinction. Aiming at single-phase fault this paper analyzes frequence change characteristics before It is found that zero-sequence electrical quantity extinction power frequence, it changes used to construct single-frequence methods dual-frequence judging time. As a tool dynamic measurement, SOGI-FLL utilized realize engineering application method The method’s accuracy proved by Matlab/Simulink simulation field test.