Observation of Partial Discharges During Breakdown Voltage Testing
Detect partial discharges by observing current and voltage waveforms during breakdown voltage testing.
By checking for partial discharges, which can lead to insulation breakdown, you can ascertain whether a coil contains any latent defects.
Observation of partial discharges while using a hipot tester as a voltage source
Apply a high voltage after connecting the tester's positive terminal to a stator's U-phase and its negative terminal to the stator's V-phase while the stator's neutral point remains unconnected. Then compare variations in the voltage at which partial discharges begin in a stators with good insulation and in a stator whose U- and V-phase coils are in contact.
AUTOMATIC INSULATION/ ITHSTANDING HiTESTER3153
・Test voltage: 60Hz AC
Increasing from 1000V in 100V increments