Title :
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
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;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549281
