Insulation Resistance Test Primer

In a perfect world, electrical insulation would allow no current to flow through it. Unfortunately, a number of factors can over time result in the deterioration and ultimate failure of electrical insulation. In this Application Note, we introduce three commonly used methods for testing insulation resistance: the Spot Reading test, the Time Resistance test, and the Step Voltage test. These three tests are used primarily to test motor, generator, cable, and transformer insulation.

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