Ground leakage detection apparatus for ungrounded systems including toroidal core detector means
First Claim
2. A GROUND-FAULT DETECTOR, COMPRISING MEANS FOR MONITORING GROUND-FAULT CURRENT INCLUDING A TRANSFORMER HAVING A SECONDARY WINDING, FAULT-RESPONSIVE MEANS CONNECTED TO SAID SECONDARY WINDING AND INCLUDING SWITCHING MEANS RESPONSIVE TO A PREDETERMINED LEVEL OF CURRENT IN SAID SECONDARY WINDING, A RELAY CONNECTED TO SAID SWITCHING MEANS, FAULT-SIGNALLING MEANS CONTROLLED BY SAID RELAY, AND AN ENERGIZING SOURCE OF CURRENT CONNECTED TO SAID RELAY AND SAID SWITCHING MEANS, SAID ENERGIZING SOURCE INCLUDING MEANS PROVIDING A HOLD-IN LEVEL OF VOLTAGE FOR SAID RELAY UNDER STEADY-STATE CONDITIONS AND PULLIN VOLTAGE INDER NO-LOAD CONDITIONS, AND A STORAGE CAPACITOR ACROSS SAID SUPPLY PROPORTIONED TO PROVIDE A PULL-IN CURRENT PULSE FOR SAID RELAY UPON OPERATION OF SAID SWITCHING MEANS.
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2 Claims
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2. A GROUND-FAULT DETECTOR, COMPRISING MEANS FOR MONITORING GROUND-FAULT CURRENT INCLUDING A TRANSFORMER HAVING A SECONDARY WINDING, FAULT-RESPONSIVE MEANS CONNECTED TO SAID SECONDARY WINDING AND INCLUDING SWITCHING MEANS RESPONSIVE TO A PREDETERMINED LEVEL OF CURRENT IN SAID SECONDARY WINDING, A RELAY CONNECTED TO SAID SWITCHING MEANS, FAULT-SIGNALLING MEANS CONTROLLED BY SAID RELAY, AND AN ENERGIZING SOURCE OF CURRENT CONNECTED TO SAID RELAY AND SAID SWITCHING MEANS, SAID ENERGIZING SOURCE INCLUDING MEANS PROVIDING A HOLD-IN LEVEL OF VOLTAGE FOR SAID RELAY UNDER STEADY-STATE CONDITIONS AND PULLIN VOLTAGE INDER NO-LOAD CONDITIONS, AND A STORAGE CAPACITOR ACROSS SAID SUPPLY PROPORTIONED TO PROVIDE A PULL-IN CURRENT PULSE FOR SAID RELAY UPON OPERATION OF SAID SWITCHING MEANS.
Specification
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Current AssigneeRobert A. Stevenson
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Original AssigneeRobert A. Stevenson
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InventorsStevenson, Robert A.
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Application NumberUS04/354,730Time in Patent Office1,350 DaysField of SearchUS Class Current340/651CPC Class CodesH02H 3/347 using summation current tra...
