Insulator out ofglass, orceramics IS
Insulation
Aging
Priming
– Partial or complete discharge of the arc in its volume.
– Overvoltage (lightning) streamer surface by an electric arc.
– Air pollution (depositing a layer of pollution on the surface of the
insulator, progressive wetting layer of pollution, development of
dry lands and appearance of partial arcs.
– Extension of partial arcs if conditions are favorable to the insulator
boot) (dusty environments near-desert or salted ones)