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Partial Discharge Causes

causes of pdcauses of pd
Causes of Partial Discharge can include gas bubbles in liquid and corona in gases

Partial Discharge causes include:

  • Voids within solid insulation
  • Contamination by particles on the surface of insulating material
  • Irregularities (e.g. sharp points) on the surface of insulating material
  • Gas bubbles in liquid insulation
  • Floating particles in gas insulation
  • Discharges around an electrode in gas (corona activity)
  • Mechanical failure or damage to insulation materials
Partial Discharge activity is also affected by environmental factors, including temperature and humidity.