Transformer bushing electric stress - QuickField simulation example
A solid-type oil-impregnated paper bushing is used to lead a 36 kV conductor inside a transformer tank.
How to find electric stress distribution in transformer bushing?
Answer Typical applications Geometry
Given
Task
Solution
Results
Reference
Engineering question
Set up an axisymmetric QuickField Electrostatics problem for a transformer bushing and evaluate electric stress distribution from computed field results.
high-voltage transformer bushings, oil-paper bushings, graded insulation bushings
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Simulation problem
Problem Type
Axisymmetric problem of electrostatics.
Relative permittivity of media: air 1, transformer oil 2.1, porcelain 5, paper 3.
Conductor potential 36 kV (r.m.s)
Calculate the electric field stress distribution in the cross-section shown by the dashed line.
Problem features a rotational symmetry so it could be simulated as 2D Axisymmetric.
To calculate the peak value of electric potential we should multiply the root mean square value by the square root of two.
Electric field strength distribution is presented in the picture below. Electric field stress at the oil-paper interface is 15.2 kV/cm.
The idea of this example, media physical properties and insulator dimensions were taken from the book by Sivaji Chakravorti Electric Field Analysis, Problem 7.2.
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