Title :
Thermostimulated depolarization (TSD) currents of silicone rubber housings and coatings
Author :
Gubanski, Stanislaw Michal
Author_Institution :
Dept. of Electr. Plant Eng., R. Inst. of Technol., Stockholm, Sweden
Abstract :
The TSD fractional polarization current technique was applied to characterize changes in silicone rubber based materials that were exposed to an aging process in natural service conditions as HV outdoor composite insulation housings and coatings. An elevated temperature polarization process, which is characteristic for silicone rubbers, was analyzed and the distribution of thermokinetic parameters of its relaxation time τ, such as preexponential factor τoa and activation enthalpy ΔH, was found. The natural aging process leads to a drastic decrease of the τoa values, while the ΔH values increase slightly
Keywords :
ageing; composite insulating materials; insulating coatings; insulation testing; rubber; silicones; thermally stimulated currents; HV outdoor composite insulation housings; TSD fractional polarization current technique; activation enthalpy; aging process; coatings; elevated temperature polarization process; natural service conditions; preexponential factor; relaxation time; silicone rubber; thermokinetic parameters; thermostimulated depolarization currents; Aging; Coatings; Conducting materials; Insulation; Polarization; Pollution measurement; Porcelain; Rubber; Strontium; Temperature;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172131
