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.
By checking for partial discharges, which can lead to insulation breakdown, you can ascertain whether a coil contains any latent defects.
Measurement Example
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.
Current and voltage waveforms when 1.0 kV
AC is applied to a non-defective stator
Current and voltage waveforms when 1.5 kV
AC is applied to a non-defective stator
Current and voltage waveforms when 1.0 kV
AC is applied to a stator with a pseudo-defect
Instruments Used
AUTOMATIC INSULATION/WITHSTANDING HiTESTER3153
MEMORY HiCORDERMR6000
・Sampling speed: 200 MS/s
・Storage time: 2.5 s
・Coupling method: AC coupling
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