ELECTRICAL BREAKDOWN IN GASES, SOLIDS AND LIQUIDS


  • The simplest and the most commonly found dielectrics are gases.
  • Most of the electrical apparatus use air as the insulating medium
  • Such gases are nitrogen, CO2, CCl2F2, SF6
  • When the applied voltage is low, small currents flow between the electrodes and the insulation retains its electrical properties.
  • When the applied voltage is large, the current flowing through the insulation increases very sharply, and an electrical breakdown occurs
  • The maximum voltage applied to the insulation at the moment of break down is called break down voltage.
  • The break down in a gas, called spark break down is the transition of a non- sustaining discharge to Self-sustaining discharge.


Two Types of Electrical Discharges in Gases


  • Non-sustaining discharges
  • Self-sustaining discharges
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