Onset voltage of negative corona on dielectric-coated electrodes in air

摘要: This paper describes theoretical and experimental investigations of the effect an electrode coating on onset voltage a corona negatively stressed electrodes. Dielectric-coated hemispherically-capped rod-to-plane gaps positioned in air are investigated. The is calculated based self-recurring single electron avalanche developed investigated gap. Accurate calculation electric field vicinity coated rod its correlation to values near bare same radius obtained using charge simulation method. utilized evaluating corona. Also, laboratory measurements electrodes carried out. effects varying nonuniformity, thickness permittivity results show that with dielectric material effective increasing surface. for agree satisfactorily those measured experimentally.