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Bushing insulator
3phase bushing insulators 10kV rated are installed on the transformer tank cover.
Problem Type: electrostatics.
Geometry: 3D extrusion.
Given:
Relative permittivity of air ε = 1,
Relative permittivity of oil ε = 2.2,
Relative permittivity of insulator ε = 6,
phase A electric potential U_{A} = 10000·√2/√3 · cos(0) = +8165 V,
phase B electric potential U_{B} = 10000·√2/√3 · cos(120) = 4082 V,
phase C electric potential U_{C} = 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).
Download video.
Results:
Electric field strength distribution at the surfaces of the insulators is presented at the picture below.
Download simulation files bushing_insulator.zip.
Download video (AVI file)  Play in browser (Firefox, Chrome, Opera).
Watch online on YouTube
