Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1975-06-04
1977-05-03
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
318447, 361 24, 361 31, H02H 709
Patent
active
040217000
ABSTRACT:
Complete 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 either an underload or overload condition. Time delays are introduced before shutdown to avoid undesired nuisance shutdowns otherwise caused by transient or momentary conditions. When the pump motor is de-energized in response to an underload condition, it is automatically restarted after a predetermined time delay. All of the delay functions are precisely determined by division of the power line frequency. Downhole pressure and temperature are also sensed and if they become excessive the motor is automatically de-energized to prevent overheating. The presence of an auxiliary physical condition, such as filling up a retaining tank, also causes the pump motor to be turned off.
REFERENCES:
patent: R26483 (1968-11-01), Legg
patent: 3417290 (1968-12-01), Craddock
patent: 3509824 (1970-05-01), Schmidly
patent: 3581179 (1971-05-01), Jones
patent: 3641546 (1972-02-01), Blackburn
patent: 3688157 (1972-08-01), Spears
patent: 3742303 (1973-06-01), Dageford
patent: 3786501 (1974-01-01), Marnerakis
patent: 3826955 (1974-07-01), Fest
patent: 3932789 (1976-01-01), Sons et al.
Borg-Warner Corporation
Miller J D
Salce Patrick R.
Tracy James E.
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