Composite papers with enhanced electrical strength

A theoretical analysis of the possibility of increasing the electrical strength, E s, of solid dielectrics has been carried out. It is shown that the local electric field intensity in regions of defect (pores) aggregation can be about 5 times larger than the average field applied to the paper dielec...

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Bibliographic Details
Published in:Composites science and technology 1994, Vol.51 (3), p.325-329
Main Authors: Kaplan, A.M., Chekunaev, N.I., Bezhikina, L.V., Nikolskii, V.G.
Format: Article
Language:English
Subjects:
composite papers
electrical strength
porous dielectric
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Summary:A theoretical analysis of the possibility of increasing the electrical strength, E s, of solid dielectrics has been carried out. It is shown that the local electric field intensity in regions of defect (pores) aggregation can be about 5 times larger than the average field applied to the paper dielectric. This is one reason for the fact that the electrical strength of ‘large-porous’ electrical capacitor papers (CPs) are only a fifth to a third of those of ‘fine-porous’ dielectrics such as hydrated cellulose films. To enhance the value of E s of CPs noticeably it is necessary either to prevent the pores exceeding some critical size or to provide a sufficiently small dispersion of the pore sizes. Simple fabrication methods of dielectric composite papers with CPs as a main component—referred to as composite papers—give materials with values of E s exceeding 110 kV/mm, which is higher than the values reached previously.
ISSN:0266-3538
1879-1050
DOI:10.1016/0266-3538(94)90102-3