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

Volume

2

fYear

1994

fDate

3-8 Jul 1994

Firstpage

752

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICPADM.1994.414120

Filename

414120