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    • 5. 发明专利
    • FAULT SECTION DECIDING METHOD FOR POWER CABLE
    • JPH07280871A
    • 1995-10-27
    • JP9821194
    • 1994-04-11
    • SUMITOMO ELECTRIC INDUSTRIES
    • MATSUMURA TORUABE NORIO
    • G01R31/08H01B7/32H01B9/00
    • PURPOSE:To decide a faulty section by detecting a fault current of a power cable through a CT, driving a solenoid with the output therefrom to bend an optical fiber, and then detecting the optical loss thud produced through an OTDR at the end of the optical fiber. CONSTITUTION:When a CT3 disposed at a joint of a power cable A detects a fault current of the power cable A, a solenoid 5 is operated with the output therefrom. Consequently, a stopper 6 is removed from a lower member 4b which is urged upward by means of a spring 7 and engages with an upper member 4a thus bending an optical fiber 1. Consequently, optical loss is generated in the fiber 1 and the generating position is detected at the fiber end 1 by means of an OTDR 2. Such detection mechanism is installed at each joint and the length of the optical fiber up to the installing position is previously measured. The joint of the cable, through which the fault current passed, is then determined with reference to the loss generating point. The fault point is located by tracking the fault current passing points.