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The insulation resistance of motor shall be measured between ____________ by using megger.
  • a)
    Winding to rotor
  • b)
    Winding of machine and its frame
  • c)
    Between two windings
  • d)
    Winding and direct earth
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The insulation resistance of motor shall be measured between _________...
The insulation resistance of motor shall be measured between Winding of machine and its frame by using megger.
Measurement of Winding insulation resistance:
  • The measurement of insulation resistance is carried out by means Megger (500V or 1000V) normally at 160RPM.
  • The insulation resistance of each phase winding against the frame and between the winding shall be measured.
  • The minimum acceptable value of the insulation resistance varies with the rated power and rated voltage of the motor.
The following equation is used while measuring the insulation resistance.

IR is the insulation resistance in MΩ at 25°C
E is rated phase voltage and P is rated power in KW.
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The insulation resistance of motor shall be measured between ____________ by using megger.a)Winding to rotorb)Winding of machine and its framec)Between two windingsd)Winding and direct earthCorrect answer is option 'B'. Can you explain this answer?
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