Dielectrometry measurements of spatial moisture profiles in oil-impregnated pressboard

Author

Sheiretov, Y. ; Zahn, M.

Author_Institution

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

Volume

2

fYear

1994

fDate

3-8 Jul 1994

Firstpage

701

Abstract

The dielectric spectrum of pressboard, (i.e. its complex permittivity as a function of frequency), is related to its moisture content and to its temperature. Consequently, it is possible to use dielectrometry measurements to measure a pressboard sample´s moisture content. A method of calculating the complex permittivity of pressboard involves interdigitated electrodes, applied only to one surface of the sample. Since the electric field´s depth of penetration is dependent on the spatial wavelength of the electrodes, different sensors yield information from different depths in the material, making it possible to measure spatial distributions of the dielectric properties. This can allow the study of the diffusion of water in pressboard

Keywords

composite insulating materials; diffusion; insulation testing; interdigital transducers; moisture measurement; permittivity measurement; power transformer insulation; power transformer testing; transformer oil; complex permittivity; dielectric spectrum; dielectrometry measurements; electric field penetration depth; electrode spatial wavelength; flexible sensors; interdigitated electrodes; oil-impregnated pressboard; spatial distributions; spatial moisture profiles; water diffusion; Dielectric materials; Dielectric measurements; Electrodes; Electromagnetic measurements; Frequency; Moisture measurement; Permittivity measurement; Petroleum; Temperature; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on

Conference_Location

Brisbane, Qld.

Print_ISBN

0-7803-1307-0

Type

conf

DOI

10.1109/ICPADM.1994.414107

Filename

414107