AC Pulse Dielectric Barrier Corona Discharge Over Oil Surfaces: Effect of Oil Temperature

The oil temperature effect on the interaction between plasma caused by high ac pulse barrier corona discharge and dielectric oil film is investigated. The results showed that funnels due to the impact of electric wind or the shock wave generated by streamer discharge occurred more easily under asymmetric negative ac pulse voltages at low oil temperatures but more difficult at high oil temperatures compared with those under asymmetric positive ac pulse voltages. The variation of the funnel diameter with voltage was more obvious under asymmetric positive ac pulse voltages. Oil boiling appeared in the funnel induced by discharge under asymmetric negative ac pulse voltages with high temperatures; thermal flow manifested by localized material transfer existed, and finally, a viscous layer formed in the funnel for oils with elevated temperatures under asymmetric positive ac pulse voltages.