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    • 10. 发明专利
    • DETECTION OF FAULT POINT OF POWER CABLE
    • JPS63229380A
    • 1988-09-26
    • JP6357587
    • 1987-03-18
    • MITSUBISHI CABLE IND LTD
    • SHIMOMURA TAMAZOUOWADA SHIGERUHARA HIROSHI
    • G01R31/08
    • PURPOSE:To achieve an accurate detection of a fault point, by receiving an electromagnetic wave due to arc caused by a dielectric breakdown with an antenna approaching a power cable. CONSTITUTION:When arc is caused due to a dielectric breakdown at a certain point of a power cable 1, an electromagnetic wave is radiated and received with an antenna device 31 near a breakdown point to send a power to detectors 30 through a lead 32. In this case, the detector 30 plays a role of optically coupling an outgoing optical fiber 21 and an incoming optical fiber 22. When an electromagnetic wave due to arc is generated, an optical pulse and an identification pulse already inputted into the fiber 21 are transmitted to the fiber 22 and received with a pulse counter 42 and an arithmetic unit 6 to determine the position of the dielectric breakdown between the detectors 30 and 30 from the state such as waveform geometry of the optical pulse and a distance to the detectors from reflection time of the identification pulse. Thus, a correct fault point can be detected.