DEVELOPMENT OF LOW-PERMITTIVITY PRESSBOARD AND ITS EVALUATION FOR INSULATION OF OIL-IMMERSED EHV POWER TRANSFORMERS

被引：30

作者：

KAMATA, Y

OHE, E

ENDOH, K

FURUKAWA, S

TSUKIOKA, H

MAEJIMA, M

FUJITA, H

NOZAKI, M

ISHIZUKA, F

HYOHDOH, K

机构：

[1] YUKA IND CO,TOKYO,JAPAN

[2] MITSUBISHI PAPER MILLS CO LTD,TOKYO,JAPAN

来源：

IEEE TRANSACTIONS ON ELECTRICAL INSULATION | 1991年 / 26卷 / 04期

关键词：

D O I：

10.1109/14.83708

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

If the permittivity of pressboards being made of cellulose material could be decreased to that of insulating oil, the strength of the electric field in oil gaps for oil-paper-pressboard composite insulation systems would be reduced and thus, high breakdown strengths of oil-paper-pressboard composite insulation system would be expected. Consequently, the insulating design is improved for large power transformers. This paper describes the development of a low permittivity pressboard obtained by blending polymethylpentene fiber with cellulose fiber. The permittivity is 3.5, which is lower than 4.7 for the conventional pressboard. With the new pressboard, insulating characteristics of intercoil models are investigated under lightning impulse and ac voltage conditions. It is demonstrated that a spacer fabricated from the new pressboard material increases the partial discharge inception and breakdown voltages up to 30% compared with the conventional pressboard spacers.

引用

页码：819 / 825

页数：7