Characteristics of surface charge on oil impregnated pressboard under non-uniform DC stress

Author

Chen Yi-long ; Qi Bo ; Li Cheng-rong ; Xi Chao-chao ; Liao Yi-fan

Author_Institution

Beijing Key Lab. of High Voltage & EMC, North China Electr. Power Univ., Beijing, China

fYear

2013

fDate

20-23 Oct. 2013

Firstpage

303

Lastpage

306

Abstract

It is very important of the surface charge distributions on the oil impregnated pressboard under nonuniform DC electric field, for the design and application issue of a converter transformer, which is not reported in the literature. In order to have a better understanding of the characteristics of the surface charges on oil impregnated pressboard produced by the non-uniform DC electric field, we studied surface charge distribution on oil impregnated pressboard produced by the needle plate electrode based on an electrostatic capacitive probe measuring system. It is found that under the highly non-uniform electric field, the surface charge polarity on oil impregnated pressboard mainly depend on the polarity of applied voltage and the accumulation and dissipation characteristics of the surface charges under the positive stress are different from that under the negative stress.

Keywords

electrodes; power transformer insulation; stress analysis; surface charging; transformer oil; applied voltage polarity; converter transformer; electrostatic capacitive probe measuring system; needle plate electrode; negative stress; nonuniform DC electric field; nonuniform DC stress; oil impregnated pressboard; positive stress; surface charge dissipation characteristics; surface charge distribution characteristics; surface charge polarity; Charge measurement; Electric fields; Electrodes; Oil insulation; Probes; Voltage measurement;

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.2013.6748334

Filename

6748334