Title :
The effect of the tip curvature on the prebreakdown current pulse relating to the negative streamer inception
Author :
Nakayashiki, T. ; Watanabe, Y. ; Yamashita, H.
Author_Institution :
Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan
Abstract :
In this paper, the relation between the prebreakdown current pulses associated with the negative streamer inception and the tip curvature was investigated in cyclohexane. The ultra wide bandwidth method was used to measure the prebreakdown current pulse under impulse voltage (1.5/540 μs) condition, and a high-speed high magnification shadowgraph system was used to observe the streamers. At a tip curvature of 0.5 μm, the charge amount of the first current pulse was 0.12-0.45 pC. On the other hand, at a tip curvature of 1.0 μm, the range was 0.39-0.92 pC. When the streamer shape was the same at each tip curvature, the range of minimum injected charge amount to form the streamer was similar
Keywords :
dielectric liquids; discharges (electric); electric breakdown; impulse testing; organic insulating materials; 0.5 to 15 mum; cyclohexane; high-speed high magnification shadowgraph system; impulse voltage; minimum injected charge; negative streamer inception; prebreakdown current pulses; tip curvature; ultra wide bandwidth method; Bandwidth; Current measurement; Dielectric measurements; Electrodes; Performance evaluation; Pulse measurements; Pulse transformers; Shape measurement; Testing; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-6413-9
DOI :
10.1109/CEIDP.2000.885282
