Introduction to Insulation Resistance Test
Along with a bar copper wire, short all the commutator segments, as displayed in the below diagram.
Check the insulation resistance among the body and the commutator or segments through a 500V Megger, for armatures rated up to 250 volts.
Thus the IR measured shall be greater than 1 mega-ohm. If the value is less than 1 mega- ohm, in the winding or a weak insulation, the moisture is to be supposed. This test is occasionally conducted through a series test lam and is termed the ground test. It will just point out if any coil is grounded, and not the insulation resistance.
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