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Bushing insulator

# Bushing insulator

3-phase 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).

**Results:**

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

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