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Core-end insulation electric stress

QuickField simulation example

This is an example of the slot insulation simulation, performed with QuickField software. To reduce the field intensity along the surface of the insulation the semi-conducting paint is applied.

Engineering question
How to find electric field control in composite HV insulation

Engineering answer
Set up a plane-parallel QuickField AC Conduction problem for a composite high-voltage insulation system and evaluate electric field control from computed field results.

Typical applications
electric machine slot insulation, stator winding insulation systems, HV insulation structures

Problem Type
Plane-parallel problem of AC conduction.

Geometry
Slot insulation electric stress To reduce the field intensity along the surface of the insulation the semi-conducting paint is applied. Insulation Conductor Core (grounded) Conductive armor tape Stress grading

Given
Relative permittivity of insulation 3.
Relative permittivity of stress grading paint 4,electrical conductivity 2 μS/m.
Rated voltage Uf = 15 kV (r.m.s.), frequency f = 50 Hz.

Task
Calculate the electric field stress distribution.

Solution
Semiconductor is modeled as a media featuring both electric permittivity and conductivity, though small.

Results
Maximal value of electric field stress is 8.3 kV/mm.

Electric field stress distribution in the core-end insulation
Core-end insulation electric stress