Observation of cathode streamer initiation in dielectric liquids under high magnification

Author

Yamazawa, K. ; Okumura, M. ; Uemura, M. ; Yamashita, H. ; Forster, E.O.

Author_Institution

Keio Univ., Yokohama, Japan

fYear

1993

fDate

17-20 Oct 1993

Firstpage

324

Lastpage

329

Abstract

The cathode-streamer initiation process in cyclohexane under nonuniform field was observed. An impulse voltage was applied to a tungsten needle of 0.5 μm radius. The streamer growth was photographed using a high-magnification, high-speed shadowgraph system. The streamer initiation voltage was determined to be -5.18 kV. The initial streamer structure was filamentary. Within 100 ns of inception it changed to a bushlike structure which increased with increasing voltage until a secondary stem appeared and the process appeared to repeat itself. After their expansion process stopped they were noted to break into small bubbles. Partial discharges (PDs) were measured using an LED (light-emitting diode) current measurement system. The relation between PD and streamer growth is discussed

Keywords

dielectric liquids; discharges (electric); organic compounds; organic insulating materials; -5.18 kV; LED current measurement system; W needle; bushlike structure; cathode streamer initiation; cyclohexane; dielectric liquids; high magnification; high-speed shadowgraph system; impulse voltage; nonuniform field; partial discharges; streamer growth; Cathodes; Current measurement; Dielectric liquids; Dielectric measurements; High speed optical techniques; Needles; Optical sensors; Partial discharges; Pulse measurements; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1993. Annual Report., Conference on

Conference_Location

Pocono Manor, PA

Print_ISBN

0-7803-0966-9

Type

conf

DOI

10.1109/CEIDP.1993.378952

Filename

378952