Device, computer program product and computer-implemented...

F - Mech Eng,Light,Heat,Weapons – 04 – D

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Details

F04D 15/00 (2006.01) E21B 43/12 (2006.01) F04B 47/06 (2006.01) F04B 49/02 (2006.01) F04B 49/10 (2006.01) F04D 13/10 (2006.01)

Patent

CA 2713745

A system for detecting a backspin condition of a motor in an electrical submersible pump is described herein. The system comprises a variable speed drive for powering the motor via a power cable; and a controller, the controller having a memory, a computer processor, and a computer program product stored on the memory and executable by the processor. The computer program product comprises the instructions of: monitoring an input current or impedance on the power cable to determine changes in motor current impedance, comparing changes in the motor current impedance to a historical threshold value for backspin events to determine whether the motor is backspinning; impeding operable power to the motor when it is determined the motor is backspinning; supplying a low AC voltage to the motor after it is determined the motor is backspinning; and determining whether or not the motor has stopped backspinning by monitoring the low AC voltage.

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