Title :
Accelerated weatherability of shed materials for composite insulators
Author :
Hirano, Yoshikuni ; Inohara, T. ; Toyoda, M. ; Murase, H. ; Kosakada, M.
Author_Institution :
Toshiba Corp., Kawasaki, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
Shed materials for hollow composite insulators (low temperature vulcanized silicone rubber, high temperature vulcanized silicone rubber, ethylene vinyl acetate and ethylene propylene diene monomer) were examined through accelerated weathering tests and their weathering resistances were evaluated from changes of surface and bulk properties. For silicone rubber, changes in the content of low molecular weight silicone (silicone oil) related to maintaining water repellency were investigated. The results showed that silicone rubbers had excellent weathering resistance and kept high water repellency during long term weathering tests. Using an equivalent model, an investigation was also carried out on how non-soluble contaminations deposited on the surfaces of sheds in outdoor service could cut off UV rays
Keywords :
ageing; composite insulators; environmental degradation; environmental testing; ethylene-propylene rubber; insulator contamination; life testing; silicone rubber insulators; ultraviolet radiation effects; UV irradiation; accelerated weatherability; bulk property changes; equivalent model; ethylene propylene diene monomer; ethylene vinyl acetate; high temperature vulcanized silicone rubber; hollow composite insulators; long term weathering tests; low molecular weight silicone; low temperature vulcanized silicone rubber; nonsoluble contaminations; shed materials; silicone oil; surface property changes; tracking resistance; water repellency; weathering resistance; Acceleration; Composite materials; Insulation; Insulator testing; Life estimation; Materials testing; Rubber; Surface resistance; Temperature; Water pollution;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
