Title :
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
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;
Conference_Titel :
Electrical Electronics Insulation Conference, 1995, and Electrical Manufacturing & Coil Winding Conference. Proceedings
Conference_Location :
Rosemont, IL
Print_ISBN :
0-941783-15-4
DOI :
10.1109/EEIC.1995.482352
