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Here's an abstract that might be of interest.
IEEE Transactions on Dielectrics and Electrical Insulation Vol. 6 No.
3, June 1999
An Overview of Electrical Properties for Stress Grading Optimization
Jean P. Rivenc and Thierry Lebey
Laboratoire de Genie Electrique, Toulouse, Cedex France
ABSTRACT
The scope of the following paper is to present, both from a theoretical and
a practical point of view, some aspects involved in stress grading in the
general configuration where insulated HV conductors pass through a grounded
screen. The difference between capacitive and resistive materials is
discussed; particular attention is devoted to the rules governing the
potential and the field distribution in both cases. The case of a
capacitive varnish with nonlinear permittivity is discussed and a
comparison with materials of constant permittivity is made. The
experimen-tal behavior of nonlinear semiconducting materials used in
practice is examined and a dis-cussion is given about the possible use of
resistive materials of constant conductivity. Finally practical
considerations are listed as basic rules for optimizing the grading effect.
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