Evaluation of dielectric liquids by measurement of their partial discharge characteristics

Author

Lundgaard, Lars E. ; Kyrkjeeide, Stig L.

Author_Institution

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

fYear

1994

fDate

23-26 Oct 1994

Firstpage

901

Lastpage

909

Abstract

Measurements of discharge signatures under AC differentiate between various liquids. The signatures are heavily influenced by the condition of the liquid (i.e gas and moisture content). The radius of the needle electrode also determines which types of positive discharges develop. Measurement of light emission is a sensitive alternative to conventional quasi integrating electrical measurement. The risk for breakdown is greatest for the positive discharges. The positive discharges occur at low rates, probably depending on field enhancement at the needle electrode due to negative space-charges from numerous sub-pC negative discharges

Keywords

dielectric liquids; dielectric liquids; discharge signatures; field enhancement; light emission; needle electrode radius; negative space-charges; partial discharge characteristics; positive discharges; quasi integrating electrical measurement; sub-pC negative discharges; Dielectric liquids; Dielectric measurements; Electric breakdown; Electric variables measurement; Electrodes; Impulse testing; Optical pulses; Partial discharge measurement; Partial discharges; Petroleum;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1994., IEEE 1994 Annual Report., Conference on

Conference_Location

Arlington, TX

Print_ISBN

0-7803-1950-8

Type

conf

DOI

10.1109/CEIDP.1994.592083

Filename

592083