Overload protection system for three-phase submersible pump moto

Details Overload protection system for three-phase submersible pump moto Overload protection system for three-phase submersible pump moto

1975-06-04

1976-12-28

Envall, Jr., R. N.

317 38, 317 13R, H01H 4718

Patent

active

040004465

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 otherwise caused by transient or momentary conditions. The shutdown time delay is variable and is inversely proportional to the amount of overload in order that greater overloads result in faster shutdowns.

REFERENCES:
patent: 3633073 (1972-01-01), Day et al.
patent: 3826955 (1974-07-01), Fest
patent: 3831061 (1974-08-01), Boyd

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