Review of Kraft paper/natural ester fluid insulation system aging

Author

Rapp, K.J. ; Luksich, J.

Author_Institution

Cooper Power Syst., Waukesha, WI, USA

fYear

2011

fDate

26-30 June 2011

Firstpage

1

Lastpage

4

Abstract

We examine the results of recent Kraft paper/natural ester fluid insulation system sealed tube aging studies. The initial rates of cellulose degradation of Kraft and thermally upgraded Kraft in mineral oil or natural esters are similar. Subsequent degradation in natural ester occurs at a slower rate. This appears to be true for both plain and thermally upgraded Kraft. Based on early sealed tube aging results, the insulation unit life of the natural ester/thermally upgraded Kraft insulation system is estimated to be 130°C. Accelerated aging of single phase distribution transformers filled with natural ester also show a reduction using a thermally upgraded Kraft/natural ester insulation system, meeting criteria for 120°C hottest spot temperature operation.

Keywords

ageing; distribution networks; paper; power transformer insulation; seals (stoppers); transformer oil; Kraft paper-natural ester fluid insulation system aging; accelerated aging; cellulose degradation; mineral oil; sealed tube aging; single phase distribution transformer; thermally upgraded Kraft; Aging; Fluids; Minerals; Oil insulation; Power transformer insulation; accelerated aging; insulation; natural ester; vegetable oil;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids (ICDL), 2011 IEEE International Conference on

Conference_Location

Trondheim

ISSN

2153-3725

Print_ISBN

978-1-4244-7352-6

Electronic_ISBN

2153-3725

Type

conf

DOI

10.1109/ICDL.2011.6015464

Filename

6015464