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ACElec3: Slot Insulation

End part of the rotor winding of the turbine generator

Problem Type:
A plane-parallel problem of AC conduction.

Geometry:

Given:
Relative permittivity of coating ε = 4.
Relative permittivity of insulation ε = 3.
Relative permittivity of SiC lacquer ε = 4.
Conductivity of coating g = 10^-4 S/m;
Conductivity of insulation g = 10^-10 S/m;
Conductivity of SiC lacquer g = 10^-8... 10^-5 S/m;
Frequency f = 50 Hz;
Voltage U_f = 15000 V;
Breakdown voltage E = 25 kV/mm.

Problem:
In the overvoltage test the voltage U = 2U_f + 5 kV is applied. The field intensity along the surface of insulation should be less then E_S < 0.5 kV/mm. To reduce E_S value the special semi-conducting SiC lacquer is applied. We shold determine the distribution of the field intensity along the surface of isolation.

Results:

See the ACElec3.pbm problem in the Examples folder.