Determination of streamer diameter in insulating oil

Author

Badent, R. ; Kist, K. ; Schwab, A.J.

Author_Institution

Inst. of Electr. Energy Syst. & High-Voltage Technol., Karlsruhe Univ., Germany

fYear

1995

fDate

18-21 Sep 1995

Firstpage

129

Lastpage

133

Abstract

Exact modeling of streamer propagation requires precise knowledge of their geometry. Earlier evaluations of shadowgraph photographs revealed diameters as low as approximately 25 μm, an energetic balance yields even lower values. To ascertain the geometric conditions, in a point-plane configuration with an electrode distance of 120 mm, pre-discharge phenomena in transformer oil were investigated up to 200 kV alternating voltage. The evaluation revealed that the streamers have a mean diameter of only approximately 12 μm which is significantly less than the previously estimated values

Keywords

automatic test equipment; automatic testing; electric breakdown; insulation testing; partial discharges; power transformer insulation; power transformer testing; transformer oil; 12 mum; 120 mm; 200 kV; 25 mum; breakdown tests; energetic balance; geometric conditions; insulating oil; point-plane configuration; pre-discharge phenomena; streamer diameter; streamer propagation; transformer oil; Cameras; Electrodes; Oil insulation; Optical recording; Oscilloscopes; Partial discharges; Petroleum; Pollution measurement; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Electronics Insulation Conference, 1995, and Electrical Manufacturing & Coil Winding Conference. Proceedings

Conference_Location

Rosemont, IL

Print_ISBN

0-941783-15-4

Type

conf

DOI

10.1109/EEIC.1995.482352

Filename

482352