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This study addresses the dielectric performance of nonpolar hydrocarbon liquids andmineral oils under negative polarity stress. Stopping length for non-breakdown streamers, breakdown voltages and velocities for various pre-breakdown streamermodes have been studied for a selection ofmodel liquids (cyclohexane andwhite oils), for a gas to liquid oil, and a refined naphthenic transformer oil. Studies of propagationmodeswere done using an 80mmpoint to plane gap and a step voltagewith 0.5μs rise time. Light emission and pre-breakdown currents have been recorded and instantaneous velocities have been derived from images of propagating streamers. Compared to positive polarity, there are less differences in streamer behaviour in the oils examined under negative polarity. Breakdown voltages and acceleration voltages are higher for negative streamers than for positive ones, while their propagation velocities are lower.While propagationmodes for positive voltages are quite distinct, themode changes for negative ones aremore gradual. The behaviour of both positive and negative streamers is in linewith the hypothesis that the propagation is governed by electron avalanches and quantum chemical properties of liquid components.

journal of physics communications

Pre-breakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 2: behaviour under negative polarity and comparison with positive polarity