Optical and electrical characterization of creeping discharges over solid/liquid interfaces under lightning impulse voltage

摘要: This paper deals with the experimental characterization of discharges propagating over solid insulators immersed in mineral oil, under impulse voltages using a point-plane electrode arrangement. It's shown that nature and thickness insulator significantly influence characteristics creepage discharge especially final length Lf density branches rho. For given thickness, increases quasi-linearly voltage; it decreases when increases. So rho dielectric constant insulator; also is reduced. indicates important role capacitive effect propagation mechanism. The main followed by secondary one opposite sign to