Electric heating – Heating devices – With current connection and/or disconnection means
Patent
1981-01-26
1983-03-08
Paschall, M. H.
Electric heating
Heating devices
With current connection and/or disconnection means
219519, 219507, 219492, 361 93, 361235, 340650, 373102, H05B 102
Patent
active
043762433
ABSTRACT:
A current shunt in the power supply to an electric furnace generates a signal voltage proportional to furnace current. A voltage rate comparator senses a high change rate of signal level corresponding to arcs occurring in the furnace and the comparator output pulse is fed to a preset counter. The counter is reset periodically. If a predetermined number of pulses are registered by the counter within a preset time interval, the counter output will de-energize an output relay which turns the power supply off and energizes a warning signal.
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Koeller William J.
Renn Charles F.
General Motors Corporation
Hill Warren D.
Paschall M. H.
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