The insulation resistance meter test method for determining the condition of electrical insulation has been widely used for many years as a general nondestructive test method.
A serious limitation of this test is that its operating voltage of 500 to 1,000 volts will not always detect insulation punctures, whereas the higher voltages used by the high-voltage, DC testers will detect these punctures.
The insulation resistance meter test will show following parameters:
(a) Relative amount of moisture in the insulation,
(b) Leakage current over dirty or moist surfaces of the insulation, and
(c) Winding deterioration or faults by means of insulation resistance versus time curves.
(b) Leakage current over dirty or moist surfaces of the insulation, and
(c) Winding deterioration or faults by means of insulation resistance versus time curves.
