Title :
Creepage discharge characteristics over solid-liquid interfaces with grounded side electrode
Author :
Hanaoka, R. ; Kohrin, T. ; Miyagawa, T. ; Nishi, T.
Author_Institution :
Dept. of Electr. Eng., Kanazawa Inst. of Technol., Ishikawa, Japan
fDate :
4/1/2002 12:00:00 AM
Abstract :
The properties of streamers traveling over the surface of oil-immersed solid dielectrics were experimentally studied under lightning impulse conditions. Streamer polarity and the position of a grounded side electrode significantly affected the relationship between the streamer extension length and the applied voltage. Solid surface charging also had a large effect on the streamer propagation. However, the streamer propagation properties showed a consistent dependence on the potential at the solid-liquid interfaces. In addition, the potential drop inside the streamer channel was measured as a function of normalized streamer length. The curve revealed that the potential drop increased drastically within the region of ~20% from the streamer tip. The streamer appeared to progress with a constant mean velocity
Keywords :
composite insulating materials; discharges (electric); impulse testing; overvoltage; surface charging; surface potential; transformer oil; commercial transformer oil; constant mean velocity streamer; creepage discharge characteristics; grounded side electrode; lightning impulse conditions; normalized streamer length; oil-immersed solid dielectrics; overvoltage condition; potential drop; solid dielectric boards; solid surface charging; solid-liquid interfaces; streamer channel; streamer extension length; streamer polarity; streamers; surface potential distributions; Circuits; Copper; Electrodes; Needles; Oil insulation; Optical propagation; Solids; Surface charging; Surface discharges; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
