Title :
A survey of aging characteristics of cellulose insulation in natural ester and mineral oil
Author :
Frimpong, G.K. ; Oommen, T.V. ; Asano, Roberto
Author_Institution :
ABB Inc., Raleigh, NC, USA
Abstract :
The article makes a case for allowing higher temperatures in transformers filled with natural ester fluids. This article will first provide a review of data from aging studies performed on cellulose (both Kraft paper and pressboard) impregnated separately in mineral oil and BIOTEMP (ABB, USA), a high oleic sunflower based fluid. Next, possible mechanisms that explain the differences in aging behavior will be discussed. The article concludes with recommendations for new temperature limits for BIOTEMP-impregnated transformers in comparison with mineral-oil-impregnated transformers.
Keywords :
ageing; power transformer insulation; transformer oil; BIOTEMP high oleic sunflower based fluid; BIOTEMP-impregnated transformers; aging characteristics; cellulose insulation; mineral-oil-impregnated transformers; natural ester fluids; Aging; Minerals; Oil insulation; Polymers; Power transformer insulation; Temperature measurement; Transformers; Vacuum systems; BIOTEMP; aging; degree ofpolymerization; ester-filled transformer; mineral-oil-filled transformer;
Journal_Title :
Electrical Insulation Magazine, IEEE
DOI :
10.1109/MEI.2011.6025367
