Title :
Recovery of hydrophobicity on RTV coatings in vacuum
Author :
Gubanski, S.M. ; Mbwana, M.A.
Author_Institution :
Dept. of Electr. Power Eng., R. Inst. of Technol., Stockholm, Sweden
Abstract :
The effects of hydrophobicity loss by water immersion and hydrophobicity recovery in vacuum at elevated temperature were evaluated on two types of RTV insulator coatings by receding angle and DC leakage current measurements. The loss and recovery treatments were repeated five times until signs of material deterioration appeared. An increase of the leakage current was noticed as a result of the deterioration despite the fact that the hydrophobicity recovered well. A possible application of water immersion and vacuum resting is foreseen in the testing of composite and silicone rubber coated insulators
Keywords :
composite insulating materials; composite insulators; dielectric losses; electric breakdown; electric current measurement; insulator testing; leakage currents; silicone rubber; silicone rubber insulators; DC leakage current; RTV insulator coatings; composite coated insulators; hydrophobicity loss; hydrophobicity recovery; leakage current; material deterioration; measurements; receding angle; silicone rubber coated insulators; vacuum resting; water immersion; Coatings; Current measurement; Goniometers; Insulation; Leakage current; Rubber; Surface contamination; Surface treatment; Temperature; Water pollution;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-1307-0
DOI :
10.1109/ICPADM.1994.414056
