Measurement example

Check for Insulation Defects and Deterioration Even If No Non-Defective Part is Available

On a standard, properly configured 3-phase motor, the phases (U,V,and W) are balanced. Consequently, the response waveforms obtained when an impulse voltage is applied between phases (U-V,V-W,W-U) will be almost identical.

By tentatively identifying the response waveform obtained from one phase as the waveform for a non-defective part and comparing it to the response waveforms from the other phases, you can detect insulation failures and deterioration.


Non-Defective Product Response Waveform


Example of Response Waveform Exhibiting Insulation Deterioration


Example of Response Waveform Exhibiting Insulation Short

Equipment used:

Impulse winding tester ST4030A

  • High-precision waveform detection: 200 MHz, 12-bit resolution
  • Quantification of response waveforms
    (using a patent held by Toenec Corporation)

Discharge detection function ST9000

  • Detection of discharges obscured by noise
    (option)

Product Video

HIOKI Impulse Winding Tester ST4030A

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