Patent ID: 8477465

Claim:
An electric leakage detection method in a power supply system including: an electrical circuit; an opening and closing means switching conduction (opening)/non-conduction (closing) of said electrical circuit; an electric power load connected to said electrical circuit through said opening and closing means; an operation abnormality detecting means detecting operation abnormality of said electric power load; an abnormal current detecting means detecting abnormal current; and a controlling means controlling said opening and closing means, the electric leakage detection method comprising the steps of: (a) judging whether the abnormal current is detected or not in said electrical circuit; (b) judging whether said electric power load is operation abnormality or not when the judgment in said step (a) is positive; (c) judging that the electric leakage is generated in said electrical circuit when the judgment in said step (b) is negative; and (d) judging that the electric leakage is not generated in said electrical circuit when the judgment in said step (b) is positive.