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Disc insulator leakage current

QuickField simulation example

Disc insulator of electric power transmission line.

Engineering question
How to find thermal effects of leakage currents in disc insulators

Engineering answer
Set up an axisymmetric QuickField DC Conduction problem for a disc insulator and evaluate thermal effects of leakage current from computed field results.

Typical applications
disc transmission line insulators, porcelain disc insulators, suspension insulators

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