Streamer and Breakdown Characteristics of Dielectric Liquids Under Impulse Waveforms With Different Tail-Times

Impulse waveforms have been widely used in the studies of streamer and breakdown phenomena dielectric liquids. In this article, both experiments analyses were carried out to investigate effects impulse tail-time on characteristics a mineral oil synthetic ester liquid. A range positive with same front-time $0.8~ \boldsymbol {\mu } \textrm {s}$ but different tail-times from 8 notation="LaTeX">$3200~ considered. Needle-plane electrodes needle tip radius 10 notation="LaTeX">$\boldsymbol {m} $ gap mm used. It was found that reduction leads an increase 50% voltage, while instant voltage time-to-breakdown remain constant. On basis, analytical method is developed estimate under various tail-times. The valid when streamers second mode divergent fields. also observed some “self-regulation” by branching explains constancy propagation velocity applied increased.