Abstract:
When operating under alternating current
fields, the capacitive effect of cable insulation takes
precedence over the resistive effect and its permittivity
assumes a higher importance compared to electrical
conductivity towards the distribution of electric field.
Research in the past has shown that relative permittivity of a
dielectric has a dependence on operating temperature, electric
field and frequency. In this paper, the authors present a study
on the effect of temperature and field dependent, non-linear
permittivity on the resultant radial electric field distribution
in case of a multi-dielectric insulation system in a twodimensional cylindrical geometry. The effects of permittivity
coefficients, conductor boundary temperature and applied
average electric field on the distribution and peak of resultant
field have been investigated. The authors believe that these
results will prove to be useful in selection of additional layers
of insulation in multi-dielectric power cables and cable joints.
