Pollution and rain flashovers on HVDC wall bushings

Abstract

Measurements carried out on a large wall bushing are described. They show that uneven rain distribution can cause flashovers even at very low pollution levels. A possible mechanism for these rain flashovers is proposed. It is reported that water-repellent surfaces provide an efficient remedy for this type of flashover.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>