Aramid papers with improved dimensional stability

Author

Bhatia, A.

Author_Institution

DuPont Adv. Fibers Syst., Wilmington, DE, USA

fYear

1995

fDate

18-21 Sep 1995

Firstpage

409

Lastpage

410

Abstract

Meta-aramid (Nomex Type 410) papers are used as insulation in a wide variety of applications in motors, generators and transformers. These papers are prone to moisture absorption under high humidity conditions, which causes these papers to expand by about 1.0% (from bone dry to 90% RH; 23C) in the machine direction. This expansion can pose issues with their use in large generators despite their acknowledged toughness in the application. A new version of aramid papers, based on para-aramid fibers has been developed that has less than 1/7th the change in length of meta-aramid papers. The properties of this new product are discussed and compared with those of meta-aramid papers

Keywords

humidity; machine insulation; mechanical stability; moisture; paper; power transformer insulation; HV apparatus insulation; aramid paper insulation; dimensional stability; expansion; generators; humidity; length change; machine direction; moisture absorption; motors; para-aramid fibers; transformers; Bones; Dielectric breakdown; Dielectrics and electrical insulation; Humidity; Mechanical factors; Moisture; Polymers; Power transformer insulation; Stability; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Electronics Insulation Conference, 1995, and Electrical Manufacturing & Coil Winding Conference. Proceedings

Conference_Location

Rosemont, IL

Print_ISBN

0-941783-15-4

Type

conf

DOI

10.1109/EEIC.1995.482396

Filename

482396