Existing schemes' characteristics to measure capacitive current are analyzed in order to measure capacitive current of distribution network,and then to adjust arc-suppression coil for extingushing electric arc of single phase to earth.The new exact predication scheme of capacitive current is put forward,which is based on a resistance added single-phase line.Using this new method,single-phase ground fault capacitive current is predicted through examining zero sequence voltage and voltage of grounding resista...