Theory of a field-limiting dielectric

Author

Boggs, S.A.

Author_Institution

Dept. of Electr. Eng., Toronto Univ., Ont., Canada

Volume

9

Issue

3

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1391

Lastpage

1397

Abstract

This paper investigates the power frequency properties of a dielectric for which the conductivity is an exponential function of the electric field. Oil-paper constitutes the best known example of such a system. The properties of such a system are revealed through rigorous solution of Poisson´s equation, which facilitates accurate estimates of current and power densities. The analysis indicates that the expression for limiting field determined from circuit theory is approximately correct and that a dielectric with an appropriate exponential dependance of conductivity on electric field might be defect tolerant, i.e., the resistivity could change with field in a manner which would not allow dangerously high fields

Keywords

composite insulating materials; dielectric properties of solids; electrical conductivity of solids; insulating oils; paper; stochastic processes; Poisson´s equation; circuit theory; conductivity; defect tolerant; electric field; field-limiting dielectric; limiting field; oil-paper; power frequency properties; resistivity; Conductivity; Dielectrics; Frequency; Materials science and technology; Poisson equations; Production; Quality assurance; Solids; Stress; System testing;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.311167

Filename

311167