Voltage dependence of prebreakdown phenomena in insulating oil

Abstract

Prebreakdown phenomena in insulating oil were optically recorded in strongly non-uniform fields. The observed structural variations and different velocities demand a distinction in positive and negative predischarges. The positive predischarge appears in three consecutive stages: primary, secondary and tertiary streamer, each mode having its characteristic pattern and propagation velocity. The negative predischarge possesses only one propagation stage.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>