Studies of impulse creepage discharge in transformer oil

Author

Nakao, Y. ; Itoh, H. ; Sakai, Y. ; Tagashira, H.

Author_Institution

Dept. of Electr. Eng., Muroran Inst. of Technol., Japan

fYear

1990

fDate

10-14 Sep 1990

Firstpage

436

Lastpage

440

Abstract

The propagation of a creepage discharge on the surface of a solid insulator in transformer oil is investigated in the case when an impulse voltage with various values of duration is applied to a point-to-back electrode. The propagation process was observed in detail by using an ultra-high-speed photographic method combined with a schlieren optical system and a dust figure method. The discharge current and the amount of charge stored on the solid insulator were measured simultaneously. The shape and size of the schlieren figure agree well with those of the dust figure. The propagation of density changes caused by a streamer discharge corresponds to the current and charge waveform

Keywords

electric breakdown of liquids; insulating oils; transformer insulation; charge waveform; current waveform; discharge current; dust figure method; impulse creepage discharge; impulse voltage; point-to-back electrode; propagation process; schlieren optical system; solid insulator surface; streamer discharge; transformer oil; ultra-high-speed photographic method; Charge measurement; Current measurement; Electrodes; Oil insulation; Optical propagation; Optical surface waves; Power transformer insulation; Shape; Solids; Surface discharges;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Dielectric Liquids, 1990. ICDL 1990. Conference Record., 10th International Conference on

Conference_Location

Grenoble

Type

conf

DOI

10.1109/ICDL.1990.202939

Filename

202939