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Influence of impurities and additives on negative streamers in paraffinic model oil

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5 Author(s)
Dung, N.V. ; Dept. of Electr. Power Eng., Norwegian Univ. of Sci. & Technol., Trondheim, Norway ; Hoidalen, H.K. ; Linhjell, D. ; Lundgaard, L.E.
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The non-breakdown and breakdown streamers in paraffinic model oil were investigated under negative "step" voltages. Experiments were performed with the point-plane gap of 8 cm and voltage up to 540 kV. Streamer behaviors were observed with shape, stopping length, velocity, current and light emission pulses. Carbon particles markedly reduce inception and breakdown voltages of streamers, while dissolved gases have a little effect on these voltages. Both low ionization potential and electron scavenging additives accelerate the streamers. However, the electron scavenger shows a much stronger influence on streamers than the low ionization potential additive.

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:20 ,  Issue: 3 )