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Slot insulation electric stress

electric machine insulation, electric field in the insulation, slot of electric machine

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

Problem Type:
Plane-parallel problem of AC conduction.

Geometry:
Slot insulation electric stress To reduce the field intensity along the surface of insulation the semi-conducting SiC lacquer is applied. Insulation Conductor Rotor (grounded) Coating SiC lacquer

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

Task:
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.

Results:
Electric field intensity plot in slot insulation


Electric field intensity plot in slot insulation

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