Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
Correct answer: D. All of the above
- A. Phase to phase winding resistance
- B. Stator winding to earthed frame
- C. Rotor winding to earthed shaft
- D. All of the above
Explanation
An insulation-resistance test checks insulation between phases and between windings and grounded metal parts, including the stator frame and rotor shaft. Hence all three listed insulation paths can be tested.
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