
3phase bushing insulators 10kV rated are installed on the transformer tank cover.
Problem Type:
3D extrusion electrostatics.
Geometry:
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).
Results:
Electric field strength distribution at the surfaces of the insulators is presented at the picture below.
See the bushing_insulator.pbm problem in the Examples folder.