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Article | REF: D2450 V1

Pre-coating and breakdown of dielectric liquids

Author: Robert TOBAZÉON

Publication date: November 10, 1997

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1. General

1.1 Common features of material breakdown

Several features of breakdown are common to all dielectric materials:

  • the breakdown is localized: it affects only a tiny area of the medium, with the healthy part often retaining its original properties (even after a long period under tension);

  • electronic processes are always involved in the initial phase; breakdown can result from the cooperative effect of a very wide variety of phenomena (thermal, mechanical, electrohydrodynamic, chemical, etc.) that are more or less inter-correlated, giving rise to a streamer , a more or less luminous, branched and conductive tree that precedes the arc ;

  • the effects of scale are considerable:...

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