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.
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.
Automatic insulation / withstanding HiTester 3153
Memory HiCorder MR6000
Current probe CT6711
Do you have any questions or a specific inquiry? We are ready to find your measurement solution.
Please send us a message to our contact email address or contact a HIOKI partner in your country.
HIOKI contact list
Send your inquiry to: