High voltage DC testing for HV machines is resorted because

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High voltage DC testing for HV machines is resorted because:

  1. Stresses don’t damage the coil end insulation
  2. Stress distribution is representation of service condition
  3. Certain conclusions regarding the continuous aging of insulation can be drawn
  4. Standardization on magnitude of voltage to be applied is available

Correct answer: 3. Certain conclusions regarding the continuous aging of insulation can be drawn

Also see: High Voltage Engineering MCQs here

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