The influence of polarity on DC-induced streamers in n-hexane

Initiation and propagation thresholds of positive prebreakdown phenomena in hydrocarbon liquids

“…, I or dc voltage [4], two types of positive streamers are observed: a. slow ?ibush-like' one and a rapid filamentary one. Both are characterized by the typical transient currents recorded during the propagation: a series of fast impulses for slow streamers, and a continuous component for filamenta.ry ones [2-41.…”

Fast propagation of an underwater secondary streamer by the appearance of a continuous component in the discharge current

“…Streamers in dielectric liquids such as transformer oil [5,6], normal hexane [7], cyclohexane [8,9], ester [10], and liquid nitrogen [11] have long been investigated to advance our understanding of breakdown phenomena [12,13]. In positive polarity, streamer propagations in these dielectric liquids have been classified into two types, namely, slow streamers and fast streamers, based on their structures and propagation velocities.…”

“…A fast streamer is characterized by a supersonic propagation velocity of around 2 km/s and a filamentary structure. Single-shot images of both types of streamers are related to the measured discharge currents: a continuous component and fast impulses for slow streamers and a continuous component for fast streamers [5,[7][8][9]. In liquid nitrogen, it is suggested that the propagation velocity of the filamentary streamer at positive polarity decreases after a short rapid development [11].…”