Before going further the meaning of “HiPot test” needs to be discussed. The phrase
“HiPot test” is used to describe the general idea of high voltage testing as well as to
describe a specific type of high voltage insulation stress test. One must differentiate
between the concept HiPot testing and the specific HiPot test based on the context of the
discussion.
To perform any of the High Voltage DC Tests, the motor’s windings are isolated from
ground, the red test leads from the Baker Tester are connected to the motor’s three phase
coils and the black test lead is connected to the motor’s steel core/frame. The output
voltage on the red test leads is raised to a predetermined test voltage and the leakage
current flowing from the motor’s coils, through the ground wall insulation, to the motor
frame is measured. The Digital Tester then calculates the resulting insulation resistance
(IR) using Ohm’s law.