Influence of water content on the aging performance of natural ester-paper insulation

Author

Junru Xiang ; Jian Li ; Zhaotao Zhang

Author_Institution

State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China

fYear

2012

fDate

17-20 Sept. 2012

Firstpage

663

Lastpage

666

Abstract

Natural ester dielectric fluid is now available as substitute for conventional mineral oil and has already been widely used in distribution transformers. The influence of water content on the aging performance of natural ester-paper insulation is compared with that of mineral oil-paper insulation. Sealed stainless vessels containing copper, insulating paper with different initial water content and dielectric fluid (camellia oil based natural ester and mineral oil) were aged at 130 °C for 80 days. The degree of polymerization (DP) of paper, furfural concentration in oil and acid number in oil were measured during the aging. The results show that the water could accelerate the aging of insulating paper in both natural ester and mineral oil, while the degradation rate of insulating paper in natural ester is much lower than that in mineral oil. The mechanism of the slower degradation rate in natural ester is discussed.

Keywords

ageing; copper; paper; polymerisation; transformer oil; acid number; aging performance; camellia oil; distribution transformers; mineral oil; natural ester dielectric fluid; natural ester-paper insulation; polymerization; temperature 130 degC; time 80 day; water content; Aging; Degradation; Fluids; Insulation; Minerals; Power transformer insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

High Voltage Engineering and Application (ICHVE), 2012 International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4673-4747-1

Type

conf

DOI

10.1109/ICHVE.2012.6357106

Filename

6357106