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Anomalous dielectric response of very small quantities of virgin, aged and failed silicone oil.

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journal contribution
posted on 15.09.2008, 15:45 by A. Haidar, John C. Fothergill, Len A. Dissado, P. Hopewell
A technique is described for making dielectric spectroscopy measurements of very small quantities (<1μl) of oil. The technique utilises surface tension to hold the oil between the plates of a capacitor, the inter-electrode distance being controlled by a micrometer. Breakdown strength can also be estimated using this technique. Three samples of silicone oil, used in cable sealing ends, were tested: virgin, used and failed. A major component in the frequency dependent impedance had the form Z(ω)=B(1-b)(iω)/sup.1-p/). This component was interpreted in terms of a fractal percolation model, and the anomalous thickness dependence predicted by the model verified by varying the inter-electrode distance. The difference observed for the three different samples indicate that conducting contaminants are responsible for the percolation system.

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Citation

IEEE Transactions on Dielectrics and Electrical Insulation, 2003, 10 (2), pp. 336-342.

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IEEE Transactions on Dielectrics and Electrical Insulation

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

issn

1070-9878

Copyright date

2003

Available date

15/09/2008

Publisher version

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1194120

Language

en

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