Title :
Reliability of resin molded transformers
Author :
Takeuchi, Ryozo ; Fukushi, Keiji ; Kubo, Hirofumi
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
Two kinds of resin molded transformers have been developed, and their electrical and mechanical characteristics have been evaluated at various temperatures. The two transformers are molded with class F resin and class H resin. Both resins have good electric and mechanical characteristics below the glass transition temperature, and their resin molded coils have good electrical and mechanical reliabilities. Over 12 years, 20000 resin molded transformers have been produced and operated without any trouble
Keywords :
coils; organic insulating materials; polymers; power transformers; reliability; transformer insulation; class F resin; class H resin; electrical characteristics; electrical reliability; glass transition temperature; mechanical characteristics; mechanical reliabilities; resin molded coils; resin molded transformers; Coils; Dielectric losses; Electric breakdown; Glass; Insulation testing; Oil insulation; Power transformer insulation; Resins; Stress; Temperature;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109788
