Electrifying and switching on control method used for creepage protector

摘要: This invention relates to a switching-on control method for the earth leakage protective device (ELPD). When power supply interruption caused by electric network being out of order, man operation is needed again. steps are: output sustained high level from production rise-edge signal after re-supply power, obtained on/off position ELPD controlled with. If there within 20mS signal, changed into low output; if not, keeping output. 20mS, off-position switch determined, and then transmitted on-switching obtaining repeatedly, kept. automatic switching control.