Title :
Distribution of Relaxation Times in an Insulating Oil
Author :
Hakim, Raymond M.
Author_Institution :
Materials Science Division, Institute of Research, Hydro-Quebec, Varennes P. Q., Canada
Abstract :
The dielectric constant and loss of a cable insulating oil has been measured as a function of frequency and temperature. The distribution of relaxation times derived from the data is close to a log-normal (Gaussian in log ¿) distribution and is found to be dependent on temperature. The activation energy for dielectric relaxation is non-Arrhenius, similar to the activation energy for viscosity. However, the temperature dependence of both activation energies is found to be significantly different.
Keywords :
Cable insulation; Dielectric constant; Dielectric loss measurement; Dielectrics and electrical insulation; Oil filled cables; Oil insulation; Petroleum; Power cable insulation; Power cables; Temperature dependence;
Journal_Title :
Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TEI.1971.299171
