Dielectrometry measurements of effects of moisture and anti-static additive on transformer board

Author

Du, Y. ; Zahn, M. ; Lesieutre, B.C.

Author_Institution

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

Volume

1

fYear

1997

fDate

19-22, Oct 1997

Firstpage

226

Abstract

Moisture in solid insulation has detrimental effects on transformer life. When the system is not in equilibrium laboratory measurements with multiple wavelength interdigital sensors using the imposed frequency-wavenumber (ω-k) dielectrometry technique have proved to be an effective way to measure complex permittivity distribution in solid insulation which is directly related to the moisture distribution. Measurements of oil-free and oil-impregnated pressboard using interdigital sensors with changes in ambient moisture concentration are presented. A comparison between existing moisture equilibrium curves for the oil-paper system and experimental results is given. Measurements are also performed for anti-static additive in oil and the dielectrometry effects are discussed

Keywords

composite insulating materials; electrometers; insulation testing; interdigital transducers; life testing; moisture measurement; permittivity measurement; power transformer insulation; power transformer testing; anti-static additive; complex permittivity distribution; dielectrometry measurements; imposed frequency-wavenumber technique; moisture effects; multiple wavelength interdigital sensors; oil-impregnated pressboard; solid insulation; transformer board; transformer life; Frequency measurement; Laboratories; Moisture measurement; Oil insulation; Performance evaluation; Permittivity measurement; Power transformer insulation; Sensor systems; Solids; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on

Conference_Location

Minneapolis, MN

Print_ISBN

0-7803-3851-0

Type

conf

DOI

10.1109/CEIDP.1997.634600

Filename

634600