A large centrifugal pump is driven by a 200 horsepower AC induction motor.
The motor breaker control circuit contains the following protection devices: instantaneous overcurrent relay, motor thermal overload relay, control power fuses, and an anti-pumping device.
The pump had been manually started and stopped several times during a 5 minute period when the motor breaker tripped.
Which one of the following is the most likely cause of the breaker trip?
A. Motor thermal overload.
B. Instantaneous overcurrent.
C. Blown control power fuse.
D. Anti-pumping device actuation.
Show Answer
Answer: A
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