Sensitive low field Kerr electro-optic measurements in transformer oil

Author

Sheen, D. ; Fujiwara, T. ; Zahn, M.

Author_Institution

Dept. of Electr. Eng. & Comput. Eng., MIT, Cambridge, MA, USA

fYear

1988

fDate

16-20 Oct 1988

Firstpage

334

Lastpage

339

Abstract

A frequency-selective amplifier was used to make sensitive Kerr electro-optic field mapping measurements with a small signal AC voltage superimposed on a DC level. With several different electrode materials, including brass, stainless steel, and aluminium, the authors have observed very significant levels of field distortion due to positive space charge on the order of 400 μC/m³. It was possible to measure field strengths as low as 100 V/cm with typical average field strengths tested over the range of 500 V/cm to 29 kV/cm. The transient evolution of these fields was also measured, showing the transition from a uniform to a highly nonuniform field on a time scale on the order of 60 s

Keywords

Kerr electro-optical effect; field plotting; insulating oils; space charge; transformer insulation; Kerr electro-optic field mapping; brass; electrode materials; field distortion; field strengths; positive space charge; small signal; stainless steel; transformer oil; Aluminum; Building materials; Distortion measurement; Electrodes; Frequency measurement; Signal mapping; Space charge; Steel; Testing; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1988. Annual Report., Conference on

Conference_Location

Ottawa, Ont.

Type

conf

DOI

10.1109/CEIDP.1988.26354

Filename

26354