Abstract:
Space charge always assumes critical importance
when it pertains electro-thermal problem of a dielectric
subjected to dc stresses for dc cable insulation in particular.
The significance of space charge only increases when
multilayer dielectrics, cable joints in particular, are concerned.
Interfacial polarization, complex electric field distribution and
dynamic boundary temperatures greatly increase the
probability of breakdown of a multilayer dielectric. Hence as
an extension to the authors’ previous works this paper focuses
on computation of space charge and its effects related to
electric field and temperature profiles of a multilayer
dielectric. Poisson’s equation along with Maxwell-Wagner
interfacial polarization equation were used to obtain space
charge distribution at different boundary temperatures and
fields. Net charge accumulation in individual layers at different
boundary temperatures and fields were determined.
