Creeping discharge performance of oil-paper insulation with streaming electrification

Author

Jia-xiang, Yang ; Xiao-Chun, Chi ; Li-Jian, Ding ; Ji, Liu

Author_Institution

Dept. of Electr. Mater., Harbin Univ. of Sci. & Technol., China

Volume

4

Issue

6

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

780

Lastpage

784

Abstract

In this paper, the influence of streaming electrification on the creeping discharge of an oil-paper insulation system has been investigated, using experimental models. Experimental results indicate that the initial creeping discharge voltage of the oil-paper insulation system decreases with oil flow rate. The creeping discharge path develops toward the oil entrance, and there are polarity and position effects on the creeping discharge under oil flowing conditions. Reasons for failure due to dendritic discharge on the surface of barrier boards in power transformers have been revealed in these experiments

Keywords

composite insulating materials; electrohydrodynamics; failure analysis; insulation testing; leakage currents; paper; power transformer insulation; power transformer testing; power transformers; static electrification; surface discharges; surface potential; transformer oil; UHV power transformers; barrier board surface; creeping discharge; dendritic discharge; experimental models; failure; initial creeping discharge voltage; oil flow rate; oil-paper insulation; polarity effects; position effects; streaming electrification; Circuits; Electrodes; Needles; Oil insulation; Petroleum; Power system modeling; Power transformer insulation; Testing; Valves; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.654705

Filename

654705