Materials

Parameter and application

Relative permittivity

Conductivity (S/m)

Application

Copper

1

$\text{5}\text{.8}\times {\text{10}}^{\text{8}}$

Cable conductor

XLPE

2.3

$\text{1}\times {\text{10}}^{-15}$

Main insulation

Silicone Rubber

4.3

$\text{2}\text{.727}\times {\text{10}}^{-12}\times {\text{e}}^{9.796\times {10}^{-6}\times \mathrm{E}}$

Joint insulation

Semi-conducting material

20

10

Conductive layers and stress cone

Insulation glue

3.5

$1\times {\text{10}}^{-12}$

Insulation gap