Pump control responsive to voltage-current phase angle
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United States of America Patent
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-
Nov 8, 1994
Grant Date -
N/A
app pub date -
Jul 21, 1993
filing date -
Jul 21, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pump-off controller checks for pump-off by examining the relative phase relationship between AC voltage and AC current supplied to an inductive, alternating current, electric motor driving a cyclically operated mechanical system having a walking beam for raising and lowering a subsurface pump by means of a string of sucker rods. When the phase angle between AC voltage supplied to the motor and AC current drawn by the motor exceeds a predetermined value at selected points or regions of the pumping stroke, the pumping system is shut down for a predetermined time.
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