2.5. Simulation of Power Transformers

Project with Siemens Energy:

Three phase transformer

• prescribed current sources in coils

• main flux through layered core (homogenization)

• flux penetrating casing causes eddy currents

• thin shields collecting stray fluxes

Model:

• Time harmonic, low frequency

• Nonlinear terms due to saturation in casing

Magnetic flux density:

Anisotropic elements for thin shields:

• Total object size: 6m, Thickness of shields: 2cm

• Prism elements in and behind shields, pyramid transition elements

Loss density in pressing plates:

Eddy current density:

Simulations are run on a daily basis within Siemens, on strong desktop PCs, within 20 to 120 minutes.