Q. For insulation resistance testing the most suitable electrical supply is
Solution:
- Direct current is the most suitable for insulation resistance measurement.
- When DC is employed the value obtained is resistance since the capacitive and inductive effects of the DC current are nil.
- When AC is employed the value obtained will be impedance of the system.
- The resistance actually shows the healthiness of the insulator, not the impedance. So DC is most suitable.
- The diagram below shows the arrangement for insulation testing.
<img src=’https://cloudfront.entri.app/media/inline_images/2019/10/05/10-30-08/insulation_resistance.jpg’ style=’max-width: 100%;’ />
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