DocumentCode :
1481684
Title :
Electrical characteristics of natural and synthetic insulating fluids
Author :
Arazoe, Satoshi ; Saruhashi, Daisuke ; Sato, Yuki ; Yanabu, Satoru ; Ueta, Genyo ; Okabe, Shigemitsu
Author_Institution :
Dept. of Electr. Eng., Tokyo Denki Univ., Tokyo, Japan
Volume :
18
Issue :
2
fYear :
2011
fDate :
4/1/2011 12:00:00 AM
Firstpage :
506
Lastpage :
512
Abstract :
Mineral oil with high insulation performance and cooling capability is currently used for oil-immersed transformers. However, mineral oil is derived from petroleum and thus is a limited resource. In a search for mineral oil substitutes, we investigated the characteristics of silicone and ester oils. The electrical performance was assessed in terms of the breakdown and streaming electrification characteristics and the volume resistivity. The burning characteristics of each oil type were also investigated. The temperature dependence of the breakdown voltage in an oil unit and the surface breakdown characteristics in a composite insulating system comprising an insulating oil and an oil-immersed insulator were determined. We also investigated the temperature dependence of the charge density in oil. The charge density in silicone and mineral oils increased with temperature, with maximum values at ~ 100°C and ~ 60°C, respectively. By contrast, the charge density in ester oil decreased with increasing temperature and was maximum at ≤30°C.
Keywords :
insulating materials; power transformer insulation; transformer oil; breakdown voltage; composite insulating system; cooling capability; electrical characteristics; high insulation performance; insulating fluids; insulating oil; mineral oil; oil-immersed insulator; oil-immersed transformers; surface breakdown characteristics; Electrodes; Insulators; Minerals; Oils; Power transformers; Temperature; Temperature dependence; Breakdown characteristics; Ester oil; Oil-immersed transformer; Silicone oil; Streaming electrification characteristics;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2011.5739456
Filename :
5739456
Link To Document :
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