H - Electricity – 02 – P
Patent
H - Electricity
02
P
348/20, 342/37,
H02P 3/18 (2006.01) H01H 47/18 (2006.01) H02H 3/093 (2006.01) H02H 7/085 (2006.01)
Patent
CA 1056448
ABSTRACT Overload protection of a three-phase submersible pump motor, such as the type used downhole in an oil well, is obtained with a solid state digital logic control system that monitors each of the three phase currents and shuts the pump motor down if any of those phase currents indicates an overload condition. A time delay is introduced before shutdown to avoid undesired nuisance shutdowns other- wise caused by transient or momentary conditions. The shut- down time delay is variable and is inversely proportional to the amount of overload in order that greater overloads result in faster shutdown.
252209
Ellis-Anwyl David R.
Vandevier Joseph E.
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