Distribution characteristics of acid and influence of acid on thermal aging of oil-paper insulation

Author

Chen Ling ; Liu Rui ; Cao Jun ; Wang Xiao-jian

Author_Institution

Sch. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China

fYear

2013

fDate

20-23 Oct. 2013

Firstpage

164

Lastpage

167

Abstract

To investigate the influence of acid on thermal aging of oil-paper insulation, formic acid and stearic acid are added in the oil to achieve 0.3mgKOH/g. The time taken by the acid to reach balance in the oil-paper insulation is measured, under different temperature of 20°C, 70°C and 100°C, as well as different initial moisture contents of 0.2% and 3.0%. After the distribution of acid in paper reaches to equilibration, the degree of polymerization (DP) of the paper at different aging stages are compared and analyzed. Experimental results show that formic acid is easy to dissolve in paper, while stearic acid is easy to dissolve in oil. Temperature and moisture content influence slightly on the distribution of the acid in oil-paper insulation. Formic acid influences significantly on the aging of paper, while stearic acid almost does not influence on the aging of paper.

Keywords

ageing; paper; polymerisation; power transformer insulation; transformer oil; aging stages; distribution characteristics; formic acid; moisture contents; oil-paper insulation; polymerization degree; stearic acid; temperature 100 C; temperature 20 C; temperature 70 C; thermal aging; Aging; Moisture; Oil insulation; Power transformer insulation; Temperature; Temperature measurement; formic acid; moisture; oil-paper insulation; stearic acid; thermal aging;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena (CEIDP), 2013 IEEE Conference on

Conference_Location

Shenzhen

Type

conf

DOI

10.1109/CEIDP.2013.6748232

Filename

6748232