Question

Explain briefly various theories of breakdown in liquid dielectrics

Answer 1

Answer:

In highly purified liquid dielectrics, breakdown is controlled by phenomena similar to those for gasses and the electric strength is high (of the order of 1 MV/cm). ... The gas in the bubble has a lower strength than the liquid, so that more gas is produced and the bubble grows, ultimately causing breakdown.

Formation of bubbles and cavitations:  Temperature and pressure of Liquids  Distance of separation gap between the electrodes  Nature of materials  Surface of electrodes  Viscosity  Various theories has been proposed for the breakdown of liquids 1. Suspended Particle Theory 2. Cavitations and bubble Theory 3.

Answer 2

Answer:

In highly purified liquid dielectrics, breakdown is controlled by phenomena similar to those for gasses and the electric strength is high (of the order of 1 MV/cm). ... The gas in the bubble has a lower strength than the liquid, so that more gas is produced and the bubble grows, ultimately causing breakdown.