Abstract:
High voltage direct current (HVDC) cables widely
use low density polyethylene (LDPE) as main insulation because
of its associated advantages. Though, it has been underlined that,
it displays non-linear conduction current (charge transport in
dielectric) when used under high electric field. Different charge
transport models have been proposed for understanding the
conduction current in LDPE, such as Pool-Frenkel, Hopping
model, Schottky model etc. These models explain the process of
charge transfer through the material; using different kinds of
traps present [1-4]. In this paper comparative study has been
done for famous charge transport models with experimentally
obtained conductivity for a wide range of electric field (20
kV/mm to 200 kV/mm) and at different temperatures (30˚ C, 50˚
C).
