Title :
Aramid papers with improved dimensional stability
Author_Institution :
DuPont Adv. Fibers Syst., Wilmington, DE, USA
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;
Conference_Titel :
Electrical Electronics Insulation Conference, 1995, and Electrical Manufacturing & Coil Winding Conference. Proceedings
Conference_Location :
Rosemont, IL
Print_ISBN :
0-941783-15-4
DOI :
10.1109/EEIC.1995.482396
