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Why VLF Hipot Uses Less Power Than AC Hipot in Testing

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Hipot testing is a radical way to detect failures in cables, motors and other electrical equipment. It tests a component by applying a test voltage above its rating and letting it stand for a few minutes and destroys defective components. The rationale behind this test is if it can’t withstand overloaded conditions, then it is not worthy using it.

The common test conducted for insulation testing is an AC hipot test. This test uses a test voltage with a standard frequency of 50 or 60 Hertz. Most components, especially long cable installations have high capacitance. More power is needed to overcome the reactance of the component to the test voltage. This increased test voltage makes this test prone to corona discharges or flash overs. This can be dangerous for the equipment operator. If you want a safer test, consider VLF hipot testing. This test is almost the same with AC high potential test but it uses a lower frequency of 0.1 Hertz. The reactance of electrical components to this test frequency is low, hence you can use lesser power to achieve the same results.

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