Discharges in AC-stressed oil gaps

Author

Lundgaard, Lars E.

Author_Institution

Norwegian Electr. Power Res. Inst., Trondheim, Norway

fYear

1993

fDate

19-23 Jul 1993

Firstpage

337

Lastpage

341

Abstract

Rates and phase distribution of discharges in transformer oil in an AC-stressed point-plane gap have been measured using a phase-synchronized multichannel analyzer. Three types of discharges were observed: negative discharges, which occurred at a high rate, and small and large positive discharges, which occurred at lower rates. The large positive discharges resulted in breakdown of the oil gaps. The discharge rates increased with reduced tip curvature and increasing voltage. The discharge activity was found to vary stochastically with time, and the total occurrence rate varied from 0.007 to 25 Hz. The discharges appeared over a wide phase window around the peak voltage

Keywords

transformer oil; 0.007 to 25 Hz; AC-stressed oil gaps; AC-stressed point-plane gap; breakdown; discharge activity; discharge rates; discharges; negative discharges; peak voltage; phase distribution; phase-synchronized multichannel analyzer; positive discharges; tip curvature; transformer oil; Detectors; Dielectric liquids; Electric breakdown; Electrodes; Oil insulation; Petroleum; Power transformer insulation; Pulse circuits; Stress; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Dielectric Liquids,1993., ICDL '93., IEEE 11th International Conference on

Conference_Location

Baden-Dattwil

Print_ISBN

0-7803-0791-7

Type

conf

DOI

10.1109/ICDL.1993.593963

Filename

593963