Flashover Voltage at the Interface between Two Dielectric Media
One often fails to achieve high electric strengths of vacuum, compressed gases and gas mixtures, and dielectric liquids to manufacture compact insulation equipment, because the electric strengths of insulation gaps considerably decrease when solid insulation is inserted into them. When solid dielectrics are used as barriers or parts of multilayer insulation systems, their surfaces are perpendicular to the electric field lines and hence the breakdown voltage increases. However, in spacers and base and through insulators, the dielectric surface is often parallel to the electric field vector, and the electric strength of a composite dielectric is much lower than that of individual dielectrics.
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