Energizing circuit for providing low voltage starting for submer

Details Energizing circuit for providing low voltage starting for submer Energizing circuit for providing low voltage starting for submer

1979-09-28

1982-05-18

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318512, H02P 126

Patent

active

043307400

ABSTRACT:
Low voltage starting of a three-phase submersible pump motor in a shallow well is achieved by employing a high-impedance transformer for supplying the three-phase power to the motor. Upon starting, the normally heavy current drawn by the motor results in a voltage drop through the high-impedance transformer sufficient to substantially lower the voltage across the motor and hence the starting current. In the absence of limiting the starting current, abnormally high starting torques will be produced on the motor shaft resulting in mechanical fatigue and eventually shaft breakage.

REFERENCES:
patent: 1935429 (1933-11-01), Barton
patent: 2542296 (1951-02-01), Storsand
patent: 2629076 (1953-02-01), Lloyd et al.
patent: 2648808 (1953-08-01), Tiede
patent: 3675057 (1972-07-01), Pleuger
patent: 3885175 (1975-05-01), Palloch

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