Preprocessor tutorial — High-voltage bushing

In this tutorial, the aim is to set up the model and settings file in order to generate the input for POLARIS. The model analyzed here is discussed in High-voltage bushing.

Import and view

Open the preprocessor and import the file bushing.mesh from share/examples/bushing to obtain the following view.

View of the model

Domains

The model consists of 2 electrodes (the cable surface and an embedded sheet is ground), 2 dielectric materials (air and the insulating material) and 4 embedded conducting sheets. These have to be defined in the Domains tab of the UI as in the following image.

Electric domains of the bushing

Surfaces

Next, one has to define the in- and out-side domains of each surface and the surface condition. The cable electrode consists of 3 surface regions. Here, one assumes that the cable is infinitely long and filled with a conductor. To this end, all these surface shall have Void at their outside (the side to which the normal vectors point).

Cable surfaces

The insulator is surrounded by the outer surface which forms an interface to the air.

Outer surface of insulator

The four conducting sheets are fully embedded and thus have the filling material on both sides. They are assigned to the four floating potentials defined among the domains.

Embedded conducting sheets

Finally, one has to define the outermost embedded sheet. Again, it is completely surrounded by the insulating material. It is assigned to the ground electrode.

Ground electrode

Solver

The solver settings are the same as in Sphere and Bicone.