Title :
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
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;
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
DOI :
10.1109/ICPADM.1994.414107
