Title :
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
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 σ90°C/σ20°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;
Conference_Titel :
Conduction and Breakdown in Dielectric Liquids, 1996, ICDL '96., 12th International Conference on
Conference_Location :
Roma
Print_ISBN :
0-7803-3560-0
DOI :
10.1109/ICDL.1996.565513
