H.V. Testing (High Voltage Testing)

High voltage tests are carried on different machines to check the under high voltage for a shorter time to check the quality of healthiness insulation resistance.

In this test specified voltages is applied between various windings and earth. This test should be carried out together with the insulation resistance test at manufacturer's works. Generally high voltage test is applied only if insulation resistance is less than the specified limit.

Method of testing:

The test shall be made with alternating voltage of any convenient frequency between 40 Hz to 60 Hz. The test voltage should be of sine waveform (approximately).

Duration:

 The test is started by applying 1/3rd of the test voltage and then voltage is increased to full-test voltage in accordance with the Table

This test checks the weakness of insulation, damaged insulation etc.