On the role of temperature and impurities in the low field conduction of insulating liquids

Author

Diabi, R. ; Filippini, J.C. ; Marteau, C. ; Tobazeon, R.

Author_Institution

Lab. d´´Electrostatique et de Mater. Dielectr., CNRS, Grenoble, France

fYear

1996

fDate

15-19 Jul 1996

Firstpage

350

Lastpage

353

Abstract

The conductivity of several different transformer oils-pure or used or containing known concentrations of additives-was measured using the alternate square wave method in the temperature range 20°C-90°C. The conductivity ratio σ_90°C/σ_20°C was found in the range 35-40 for pure oils and in the range 15-25 for pure oils with the addition of an ionic surfactant and for a used transformer oil. A discussion based on the Fuoss model (1958) is given. The results confirm the interest of measurements at room temperature to characterize the conductivity and dissipation factor of new and in service transformer oils

Keywords

impurities; insulation testing; ionic conductivity; power transformer insulation; power transformer testing; transformer oil; 20 to 90 C; Fuoss model; additives; alternate square wave method; conductivity ratio; dissipation factor; impurities; in service transformer oil; insulating liquids; ionic surfactant; low field conduction; room temperature measurement; temperature dependence; transformer oils; used transformer oil; Conductivity measurement; Dielectric liquids; Impurities; Oil insulation; Power transformer insulation; Temperature distribution; Temperature measurement; Temperature sensors; Testing; Thermodynamics;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Dielectric Liquids, 1996, ICDL '96., 12th International Conference on

Conference_Location

Roma

Print_ISBN

0-7803-3560-0

Type

conf

DOI

10.1109/ICDL.1996.565513

Filename

565513