Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1982-04-05
1983-12-27
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 87, 364483, H02H 308
Patent
active
044234589
ABSTRACT:
An improved system for sensing current flow in a single phase or polyphase circuit to be protected and deriving a single signal representing composite current flow. A ramp-like reference signal is applied to one input of a comparator at sampling intervals, and the outputs of a plurality of current amplifiers coupled to the other comparator input so that the duration of a change in signal output level of the comparator is an inverse function of composite current. An accumulator stage stores portions of incoming current signals less a predetermined fraction of previous accumulator contents. In the event of circuit interruption the accumulator is decremented in a manner which reflects the inferred thermal history of the system.
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Moose Jr. Harry E.
Powers Frederick W.
Siemens-Allis, Inc.
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