Title :
Influence of water content on breakdown behavior of transformer oil
Author :
Julliard, Y. ; Badent, R. ; Schwab, A.J.
Author_Institution :
Inst. of Electr. Energy Syst. & High-Voltage Technol., Karlsruhe Univ., Germany
Abstract :
This paper deals with investigations on the influence of solved water on the breakdown behavior of transformer oils. Experiments were carried out using weakly inhomogeneous fields in a rod-plane geometry with gap distance 60 mm and lightning impulse voltage. Both optical and statistical investigation were made in order to shed light on the effect. Water content varied from 10 to 85 ppm respectively. Unlike expected from measurements with AC-voltage, results showed that the impulse withstand voltages decreases first and reincreases with increasing water content. The effect of water on streamer shape and propagation velocity will be discussed in detail
Keywords :
discharges (electric); power transformer insulation; solvation; transformer oil; breakdown behavior; high-speed shadowgraph photography; lightning impulse voltage; rod-plane geometry; solved water influence; statistical investigations; streamer propagation velocity; streamer shape; transformer oils; voltage-rise method; water content; weakly inhomogeneous fields; Breakdown voltage; Cleaning; Electric breakdown; Lightning; Oil insulation; Optical propagation; Petroleum; Power transformer insulation; Power transformers; Testing;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2001 Annual Report. Conference on
Conference_Location :
Kitchener, Ont.
Print_ISBN :
0-7803-7053-8
DOI :
10.1109/CEIDP.2001.963601
