Trend of Qm Percentile Rankings 1997-2021 – Presentation

Published Jul 11th, 2022 IRMC 2022 - Vicki Warren

What Are Partial Discharges?

  • Small electrical sparks in air filled cavities in or adjacent to HV electrical insulation
  • Occur because breakdown strength of – air (3 kV/mm) < solid insulation (~300 kV/mm)
  • PD creates small voltage pulses – PD monitoring measures these small pulses

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