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Slot insulation electric stress

This is an example of the slot insulation simulation, performed with QuickField software.

Problem Type:
Plane problem of AC conduction.


Slot conductor insulation model

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 Uf = 15000 V;
Breakdown voltage E = 25 kV/mm.

In the overvoltage test the voltage U = 2Uf + 5 kV is applied. The field intensity along the surface of insulation should be less than ES < 0.5 kV/mm. To reduce ES value the special semi-conducting SiC lacquer is applied. Determine the distribution of the field intensity along the surface of isolation.

Electric field intensity plot in slot insulation
Electric field intensity plot in slot insulation

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