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    • 10. 发明专利
    • ARC DETECTION BREAKER
    • JPH04306522A
    • 1992-10-29
    • JP27261291
    • 1991-10-21
    • ALSTHOM GEC
    • BAN DOAN FUANJIYOZEFU MARUTANJIYANNPIEERU DEPURA
    • G01R31/08G01R31/327H01H33/26
    • PURPOSE: To make high-sensitivity measurement by penetrating a bottom section with the strands of a fluorescent optical fiber in a base to form a symmetrical loop. CONSTITUTION: When a circuit breaker is opened by the drive of a drive rod 16, a moving arc contact piece 7 is kept in no contact with a fixed arc contact piece 5, and an arc is generated. The light wave is transmitted via a tubular member 14, and most of high-temperature gas is released through openings 13, 15. The light passes through the small-diameter hole 35 of a plate 3, and the high-temperature gas cannot enter a support columnar body 17 due to the small diameter. The side face of an optical fiber 25 absorbs the light, the light is absorbed over the whole length of tens of cm of the optical fiber 25, and high-sensitivity measurement can be made. Since the optical fiber 25 is symmetric, individual strands can receive the same quantity of light, the same amplifiers 32, 33 are used to calibrate a device, and the device can be accurately positioned. Amplifiers different in sensitivity are selected to classify the arc into two intensity ranges after the device is once adjusted.