Title :
Electrical endurance studies on wire varnish systems and epoxy resin formulations
Author :
Ratra, M.C. ; Moorching, S.N. ; Reddy, P.V. ; Nagamani, H.N. ; Sumangala, M.G. ; Hemalatha, B. ; Poovamma, P.K.
Author_Institution :
Central Power Res. Inst., Bangalore, India
Abstract :
The results of electrical endurance studies on two distinct insulation systems are presented. The voltage endurance characteristics of polyester and polyesterimide wire varnish systems under AC and DC voltages are examined. The long-term electrical aging effect on the electrical properties of epoxy resin samples with metal chelates is considered. For the wire varnish systems, aging under DC voltage is much slower than that for AC. The long-term electrical aging of epoxy resin formulations with metal chelates has resulted in optimization of the percentage of cobalt acetyl acetonate to be added to the anhydrous epoxy resin for ensuring reliable performance
Keywords :
ageing; insulated wires; insulation testing; organic insulating materials; polymers; varnish; AC voltages; DC voltages; anhydrous epoxy resin; cobalt acetyl acetonate; electrical endurance studies; epoxy resin formulations; insulation systems; long-term electrical aging effect; metal chelates; polyester; polyesterimide; voltage endurance; wire varnish systems; Aging; Cable insulation; Dielectrics and electrical insulation; Epoxy resins; Power transformer insulation; Stress; Surges; Testing; Voltage; Wire;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109789
