A new approach to field modelling

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Main > Application > Sample problems

Bushing insulator

3-phase bushing insulators 10kV rated are installed on the transformer tank cover.

Problem Type: electrostatics.

Geometry: 3D extrusion.

pair of coaxial discs

Given:
Relative permittivity of air ε = 1,
Relative permittivity of oil ε = 2.2,
Relative permittivity of insulator ε = 6,
phase A electric potential UA = 10000·√2/√3 · cos(0) = +8165 V,
phase B electric potential UB = 10000·√2/√3 · cos(120) = -4082 V,
phase C electric potential UC = 10000·√2/√3 · cos(240) = -4082 V.

Problem:
Find the maximum field strength at the insulator and the electric field distribution.

Solution:
To find the maximum field strength it is enough to simulate the electrostatic field at the moment of maximum voltage at the specific phase insulator. Phase A insulator maximum field simulation is presented (for phases B and C similar approach should be used).

View movie Download video.

Results:
Electric field strength distribution at the surfaces of the insulators is presented at the picture below.

Download Download simulation files bushing_insulator.zip.

View movie Download video (AVI file) | Play in browser (Firefox, Chrome, Opera).

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