Title :
Degradation of epoxy insulation under combined high humidity and elevated temperature
Author :
Li, Y. ; Gao, B. ; Unsworth, J.
Author_Institution :
Univ. of Technol., Sydney, NSW, Australia
Abstract :
Aging under high humidity and elevated temperature was carried out on a bisphenol-A epoxy/silica insulating composite, which has been used as electrical insulation for high voltage switchgear. Dielectric measurements as well as DMTA, DSC, FTIR analysis were carried out on the aged samples. It was found that the mass of aged samples decreased with aging. The DMTA and DSC results showed that the cross-linking density and glass transition temperatures of the aged composite were lowered. While the dielectric properties changed significantly due to aging, FTIR results showed changes in the concentration of different function groups. It is believed that these property and structural changes were caused by uncross-linking due to hydrolysis degradation processes
Keywords :
Fourier transform spectroscopy; ageing; composite insulating materials; dielectric measurement; electric breakdown; epoxy insulation; infrared spectroscopy; insulation testing; switchgear insulation; switchgear testing; thermal analysis; DMTA; DSC; FTIR; ageing degradation; bisphenol-A epoxy/silica insulating composite; cross-linking density; dielectric measurements; dielectric properties; electrical insulation; elevated temperature; epoxy insulation under; glass transition temperatures; high voltage switchgear; humidity; hydrolysis degradation processes; Aging; Degradation; Dielectric measurements; Dielectrics and electrical insulation; Glass; Humidity; Silicon compounds; Switchgear; Temperature; Voltage;
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.1994.414120
