Therefore, the current of interest is the current that is the result of a partial discharge or breakdown, rather than the current due to capacitive coupling.The test duration must be in accordance with the safety standard being used.When using a dc hipot tester, the capacitors in the circuit could be highly charged and, therefore, a safe-discharge device or setup is needed.However, it is a good practice to always ensure that a product is discharged, regardless of the test voltage or its nature, before it is handled. By monitoring the current flow as voltages increase, an operator can detect a potential insulation breakdown before it occurs.
The production-line hipot test, however, is a test of the manufacturing process to determine whether the construction of a production unit is about the same as the construction of the unit that was subjected to type testing.This is a high-voltage test that is applied to all devices for a specific time in order to ensure that the insulation is not marginal.Hipot tests are helpful in finding nicked or crushed insulation, stray wire strands or braided shielding, conductive or corrosive contaminants around the conductors, terminal spacing problems, and tolerance errors in cables.ABB offers a comprehensive range of reliable and high efficiency motors and generators for all applications.
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If the insulation between the two is adequate, then the application of a large voltage difference between the two conductors separated by the insulator would result in the flow of a very small current.