Title :
Influence of impurities and additives on negative streamers in paraffinic model oil
Author :
Dung, N.V. ; Hoidalen, H.K. ; Linhjell, D. ; Lundgaard, L.E. ; Unge, M.
Author_Institution :
Dept. of Electr. Power Eng., Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Abstract :
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.
Keywords :
additives; discharges (electric); impurities; ionisation; oils; breakdown streamer; carbon particle; dissolved gas; distance 8 cm; electron scavenging additive; impurity influence; ionization potential additive; light emission pulse; negative step voltage; negative streamer; nonbreakdown streamer; paraffinic model oil; point-plane gap; voltages breakdown; Additives; Breakdown voltage; Carbon; Electric breakdown; Gases; Shape; Streaming media; Streamers; initiation; propagation; stopping length; velocity;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2013.6518957
