Fault identification method based on current fault limiter resonant voltage difference signal

Abstract

Series resonant fault current limiter(SRFCL) is practical limiter of EHV. SRFCL control strategy requires resonant capacitor quickly bypassed after fault occurs. Shortcircuit fault rapid identification is the key to fast trigger strategy. The paper introduces resonant voltage difference method based on limiter body signal. Simulation model is built to analysis time characteristics from the closing angles and fault distance. Logic protection criterion is designed. A small physical model is built to verify the resonant voltage difference method. Simulation results show that the resonant voltage difference method is not affected by fault parameters, experiments show that it can supply failure criterion signal within 1 ms.