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Disc insulator leakage current

Disc insulator of electric power transmission line.

Problem Type:
Axisymmetric multiphysics problem of AC Conduction coupled to Heat transfer.

Geometry:
Disc insulator leakage current Calculate the thermal effect of the leakage currents in the insulator. Cement Porcelain Metal cap Dirt layer Clamp

Given:
Relative permittivity of porcelain ε = 6,
Relative permittivity of cement ε = 2.
Dirt layer thickness 1 mm.
Dirt layer conductivity 30 uS/cm.
Porcelain thermal conductivity 1.4 W/K-m.
Air temperature +20°C, convection coefficient α = 10 W/K-m2.

Task:
Calculate the thermal effect of the leakage currents in the insulator.

Results:
Leakage current density distribution in the insulator (on the left), insulator temperature profile (on the right).

Disc insulator leakage current

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