SWITCH DEVICE WITH GROUND DEVICE

PROBLEM TO BE SOLVED: To enable a switching operation of a switch device to be carried out only when no electrical conductive state is present in a switch device with a ground device which is installed in a line branched from a main line of an electric line of DC system to a sub-line in an electric...

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Bibliographische Detailangaben
Hauptverfasser: TAMURA HIDEHIKO, SUNAGA TAKATSUGU, SATO HIROYASU, SAITO YOSHIHIRO, AZUMA HIDEO, MASUO YUJI, SAKURABA TAKESHI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To enable a switching operation of a switch device to be carried out only when no electrical conductive state is present in a switch device with a ground device which is installed in a line branched from a main line of an electric line of DC system to a sub-line in an electric car shed or the like. SOLUTION: This switch device 4 having a ground device is comprised of a current sensor 5 for sensing a current flowing in a line 2a, and a lock device 6 for normally keeping a switching operation in locked state and releasing the locked state of switching operation with an operation handle 7 when a switching operation locked state releasing signal is received. The current sensor 5 detects a current flowing in the line 2a and outputs a switching operation locked state releasing signal when it is judged that the line 2a is in non- conductive state, the current sensor 5 outputs the switching operation locked state releasing signal. A locking device 6 performs a switching locked state releasing operation with the switching operation locked state releasing signal so as to enable the switching operation of the switching device 4 having the ground device to be carried out with the operation handle 7.