Resistivity of pressboard immersed in mineral insulation oil

Author

Huaqiang, Li ; Xuhai, Zhan ; Lisheng, Zhong ; Qinxue, Yu ; Yaning, Zhao ; Guangqi, Liu ; Mori, Shigekazu ; Yamada, Shin

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an, China

fYear

2012

fDate

24-28 July 2012

Firstpage

1

Lastpage

4

Abstract

The pressboard is an important solid insulation dielectric in AC-DC converter transformers. Thus, it is very significant to understand the dielectric properties of the oil-impregnated pressboard. In this paper, the volume resistivities of oil-impregnated pressboard under different conditions have been systematically investigated. The pressboard was immersed in two kinds of mineral insulation oil, respectively. The measuring device of resistivity was full of oil and isolated from outside. All samples were measured at temperature range of 25-80°C under the field strength range of 1-30kV/mm. The influences of the temperature and the field strength on the resistivity of oil-impregnated pressboard have been investigated. The results of the volume resistivity of oil-impregnated pressboard showed that the resistivity of oil-impregnated pressboard decreased with the increase of temperature, and the activation eneregy increased with the increase of field strength. Meanwhile, with the increase of field strength, the resistivity changed slightly at first and then decreased significantly.

Keywords

AC-DC power convertors; electric strength; minerals; power transformer insulation; transformer oil; AC-DC converter transformers; activation energy; dielectric properties; field strength; mineral insulation oil; oil-impregnated pressboard resistivity; solid insulation dielectric; temperature 25 degC to 80 degC; volume resistivity; AC-DC power converters; Electrodes; Energy measurement; Magnetic field measurement; Thickness measurement; Vacuum systems; Volume measurement; Mineral insulation oil; Oil-impregnated pressboard; Resistivity; Transformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials (ICPADM), 2012 IEEE 10th International Conference on the

Conference_Location

Bangalore

ISSN

2160-9225

Print_ISBN

978-1-4673-2852-4

Type

conf

DOI

10.1109/ICPADM.2012.6318934

Filename

6318934