| 摘要 |
PCT No. PCT/JP96/01787 Sec. 371 Date Mar. 18, 1997 Sec. 102(e) Date Mar. 18, 1997 PCT Filed Jun. 27, 1996 PCT Pub. No. WO97/04323 PCT Pub. Date Feb. 6, 1997A leakage and earthing wire disconnection detection apparatus monitors for earthing wire disconnection and leakage of an electrical or electronic device during operation of the device. Two earthing wires are independently provided for the electrical or electronic device. The ends of the earthing wires on the electrical or electronic device side are electrically connected together, while earth-side ends are connected independently to earth. A single closed loop is made up of the two earthing wires, the electrical or electronic device, and earth. A detection circuit determines that the earthing wires are normal when the closed loop is closed, and abnormal when the closed loop is open. In addition, the apparatus performs leakage detection of a motor, or the like, based on a current level flowing in the earthing wires.
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