Impulse Voltage Test of Isolators
Impulse Voltage Withstand Test
- The test procedure is similar to that explain for insulators.
- The impulse generator is adjusted to produce a standard 1.2/50 impulse wave of peak value equal to the specified value of the impulse withstand voltage corrected for atmosphere conditions in accordance with I.S. Five impulse voltage waves are applied to the insulator.
- If there is no flashover or puncture, the insulator is considered to have passed the test.
- If during the application of these five waves puncture occurs or if there is more than one flashover, the insulator is considered to have failed to comply with the standard. If flashover of only one insulator occurs, a new series of ten impulse waves are applied.
- The insulator is considered to have passed the test if during new series of tests there is no flashover or puncture.