Traction motor

A high potential (hipot) test verifies that the insulation of an energized product or component is sufficient to protect the operator, system or connected components from electrical shock.

A typical electric wire has one or two components: a wire conductor along which the current flows, and insulation (aka dielectric) that shields the conductor from direct contact with other wires. Some wires also contain a third component, metallic shielding, between the conductor and the insulation. The question is: will the insulation do the job it was designed to do? If not, its failure could cause injury, loss of life, and damage to expensive equipment along with costly downtime.

A hipot test applies high voltage between a product's current-carrying conductors and its metallic shielding. The hipot tester measures current that flows through the insulation, known as dielectric leakage current. Hence, when a deliberate over-application of test voltage doesn't cause the insulation to break down (in other words if the insulation sufficiently withstands the voltage under normal operating conditions without allowing it to “leak out”), the product is considered safe under normal operating conditions.
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