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Electric field stress in the transformer oil

The transformer is submerged in the oil. The windings are insulated by the oil-impregnated paper. We need to locate the places with high electric stress (in addition to the well-known areas between windings and between windings and core).

Problem Type: electrostatics.

Geometry: 3D extrusion.

three phase transformer 3D model for electrostatic simulation

three phase transformer connection scheme Y-Y

Given:
Relative permittivity of oil εr = 2.2,
High voltage (phase) V = 6 kV (RMS).
Low voltage (phase) V = 0.4 kV (RMS).
Tank, core are grounded (zero electric potential).

Task:
Calculate the electric field stress distribution in the oil.

Solution:
We simulate the static problem (fixed moment of time), when phase A has maximum electric potential V*cos(0°), potentials of the phases B and C: V*cos(120°) and V*cos(240°) respectively. Electric potential is distributed linearly along the coil (maximum value is at the top, zero value is at the bottom of the winding).

Results:

Electric potential distribution along the windings:

three phase transformer: electric potential distribution along the windings

Electric field stress in the oil (coils, core are hidden):

three phase transformer: electric field stress in the oil

Download Download simulation files (files may be viewed using any QuickField Edition).

There are no restrictions applied to the QuickField Student Edition postprocessors.
You can view field maps, make plots, calculate integrals and print pictures in the same way that the Professional Edition users do.