Dielectric behavior of insulating liquids at very low frequency

Dielectric spectroscopy in the wide frequency range of 1 mHz to 1 kHz has been used to study the polarization and conduction phenomena in insulating liquids. The dielectric spectroscopy of mineral oil and ester oil at different conditions, i.e. temperatures and electric fields, has been measured. It...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2006-06, Vol.13 (3), p.532-538
Main Authors: Shayegani Akmal, A.A., Borsi, H., Gockenbach, E., Wasserberg, V., Mohseni, H.
Format: Article
Language:English
Subjects:
Dielectric liquids
Dielectric losses
Dielectrics
Dielectrics and electrical insulation
Electrochemical impedance spectroscopy
Frequency
Frequency ranges
Liquids
Mathematical models
Minerals
Optical polarization
Permittivity
Petroleum
Polarization
Spectroscopy
Temperature
Very low frequencies
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Summary:Dielectric spectroscopy in the wide frequency range of 1 mHz to 1 kHz has been used to study the polarization and conduction phenomena in insulating liquids. The dielectric spectroscopy of mineral oil and ester oil at different conditions, i.e. temperatures and electric fields, has been measured. It came out that at low frequencies, space charge polarization changes the permittivity of insulating liquid and at very low frequencies, the consideration of a RC parallel model for the dielectric behavior of insulating liquids is not adequate. The results indicate that the permittivity of insulating liquid increases with aging duration and therefore it can be used as a diagnosis parameter for insulating liquids. The calculation of the activation energy of the conduction process shows that consideration of single activation energy for compensation of temperature effect on dielectric loss for dielectric spectroscopy in the wide frequency range is not perfect
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2006.1657965