In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?
Correct answer: A. supplied with unbalanced voltage
- A. supplied with unbalanced voltage
- B. under-loaded
- C. over-loaded
- D. none of the above
Explanation
Negative phase-sequence currents arise from unbalanced three-phase voltages or currents and produce a reverse-rotating field. Under-loading or over-loading alone does not define phase sequence.
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