Thermal Aging Characteristics of Natural Ester Impregnated Kraft Paper and Thermally Upgraded Paper Insulation

Author

Liang, Shuaiwei ; Liao, Ruijin ; Yang, Lijun ; Li, Jian ; Sun, Caixin ; Sun, Huigang

Author_Institution

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

fYear

2008

fDate

9-12 Nov. 2008

Firstpage

426

Lastpage

429

Abstract

In order to compare the characteristics of natural ester impregnated Kraft paper and thermally upgraded paper, sealed aging vessels containing copper, insulation paper (Kraft paper and thermally upgraded paper), and natural ester were aged at 90, 110, and 130degC about 400 days. The results show that both degree of polymerization (DP) and leveling-off degree of polymerization (LODP) for thermally upgraded paper were higher than the ones of Kraft paper at the same aging condition. Furfural can be absorbed by thermally upgraded paper and can be used to monitor the aging condition of a certain natural ester impregnated paper insulation. However, furfural can not be used to compare the aging condition of different types of paper immersed in natural ester. The different disciplinarians of the water content in natural ester were analyzed and the suggestion is given that the thermally upgraded paper are more suitable for natural ester impregnated paper insulation. The infrared spectrum evidence was given that there was dicyandiamide in thermally upgraded paper, and the aging resistance mechanisms of thermally upgraded paper were analyzed.

Keywords

ageing; condition monitoring; impregnated insulation; infrared spectra; insulation testing; materials testing; paper; polymerisation; aging resistance mechanisms; condition monitoring; copper; dicyandiamide; infrared spectrum; leveling-off degree-of-polymerization; materials testing; natural ester impregnated Kraft paper; sealed aging vessels; temperature 110 C; temperature 130 C; temperature 90 C; thermal aging characteristics; thermally upgraded paper insulation; time 400 day; Aging; Dielectric liquids; Dielectrics and electrical insulation; Minerals; Oil insulation; Petroleum; Polymers; Power transformer insulation; Thermal engineering; Thermal resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

High Voltage Engineering and Application, 2008. ICHVE 2008. International Conference on

Conference_Location

Chongqing

Print_ISBN

978-1-4244-3823-5

Electronic_ISBN

978-1-4244-2810-6

Type

conf

DOI

10.1109/ICHVE.2008.4773964

Filename

4773964