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.
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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

Equipment Used

AUTOMATIC INSULATION/ ITHSTANDING HiTESTER 3153

AUTOMATIC INSULATION/ ITHSTANDING HiTESTER3153

・Test voltage: 60Hz AC
Increasing from 1000V in 100V increments

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MEMORY HiCORDER MR6000

MEMORY HiCORDERMR6000

・Sampling speed: 200MS/s

・Storage time: 2.5s

・Coupling method: AC coupling

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AUTOMATIC INSULATION/ WITHSTANDING HiTESTER CT6711

CURRENT PROBECT6711

・Range: 0.5A

・Output rage: 10V/A

・Frequency band: DC to 120MHz

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