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    • 5. 发明专利
    • BUS SWITCHGEAR
    • JPH0284005A
    • 1990-03-26
    • JP23604988
    • 1988-09-20
    • MITSUBISHI ELECTRIC CORP
    • SHIOMI MINORUNAKAHARA KOJISASAMORI KENJI
    • H02B13/02
    • PURPOSE:To prevent simultaneous disconnection of two buses by providing two bus-tie circuit breakers and interruting fault current through one circuit breaker upon occurrence of trouble in the other circuit breaker. CONSTITUTION:A bus-tie circuit breaker 9 comprises two circuit breakers 91, 92 and when a trouble occurs in the circuit breaker 91 which is in the operating range of a bus B protective relay, interruption commands are fed to a feeder circuit breaker 4 connected with the bus B and the bus-tie circuit breaker 9 so that only the bus B is disconnected from the system by means of the feeder circuit breaker 4 and the other circuit breaker 92 thus preventing simultaneous disconnection of both buses A, B. Upon occurrence of fault in the way of transformers 5 for two bus-tie circuit breakers 5, the fault point appears to be within the protective ranges 7, 8 of the buses A, B but the fault current is bypassed and simultaneous disconnection of the buses A, B is prevented. Consequently, any one of the buses A, B is connected continuously even when fault occurs at the bus-tie section thus enabling continuous operation of the bus.