Electricity: electrical systems and devices – Safety and protection of systems and devices – Too large fault makes breaker inoperative
Patent
1981-07-13
1983-01-25
Rubinson, G. Z.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Too large fault makes breaker inoperative
361 46, 219452, 337129, H05B 900
Patent
active
043706924
ABSTRACT:
A ground fault interrupter type device for protecting an electrical load device such as a range which has conductors supplied from a power source including overcurrent interruption means for interrupting the power source when a predetermined current threshold is exceeded. The electrical load device is subject to a first class of failure characterized by excessive current flow between at least one of the conductors and a ground reference point, with circuit current remaining at or below the predetermined current threshold; and to a second class of failure characterized by current through at least one of the conductors being above the predetermined current threshold. Failures of the second class include ground fault failures. In order to reduce the current interruption capability requirement for the ground fault interrupter device, there is included a means for preventing conductor interruption thereby in the event a failure of the second class occurs. Accordingly, the current-interrupting capability is at least as high as the predetermined current threshold but less than the maximum current which may flow during a failure of the second class. In the illustrated embodiments, the means for preventing conductor interruption in the event a failure of the second class occurs is a time delay which delays the activation of the ground fault interrupter for an interval sufficient to allow the overcurrent interruption means to interrupt the power source in the event a failure of the second class occurs.
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Hornung Richard E.
Wellman, Jr. Carl E.
General Electric Company
Houser H. Neil
Reams Radford M.
Rubinson G. Z.
Schroeder L. C.
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