Moisture dynamic measurements of transformer board using a three-wavelength dielectrometry sensor

Author

Du, Y. ; Zahn, M. ; Mamishev, A.V. ; Schlicker, AndD E.

Author_Institution

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

Volume

1

fYear

1996

fDate

16-19 Jun 1996

Firstpage

53

Abstract

The spatial distribution of dielectric permittivity and conductivity of an insulating medium affects the quasistatic distribution of the electric field. Multiple wavelength interdigital sensors using the imposed frequency-wavenumber (ω-k) dielectrometry technique can measure complex permittivity distributions in dielectrics. Measurements of oil-free and oil-impregnated pressboard transformer insulation using a three-wavelength sensor with changes in ambient moisture concentration are presented. With a calibrated mapping relating conductivity and permittivity to moisture concentration in oil-impregnated pressboard, the spatial distribution of moisture can be measured

Keywords

insulation testing; ambient moisture concentration; calibrated mapping; dielectric conductivity; dielectric permittivity; insulating medium; insulation breakdown tests; moisture dynamic measurements; pressboard transformer insulation; quasistatic electric field distribution; spatial distribution; three-wavelength dielectrometry sensor; Conductivity; Dielectrics; Electrodes; Frequency; Humidity; Moisture measurement; Temperature sensors; Testing; Voltage; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on

Conference_Location

Montreal, Que.

ISSN

1089-084X

Print_ISBN

0-7803-3531-7

Type

conf

DOI

10.1109/ELINSL.1996.549281

Filename

549281