Abstract

A practical finite element scheme is presented for the solution of open boundary problems. The region is considered as an open boundary annexed with a small closed boundary. The open boundary is modelled by the ballooning procedure and the results of the open boundary become the boundary conditions of the inner closed region, which is subsequently modelled by the conventional finite element method, thus enabling larger number of elements to be used for the interior. Good accuracy is therefore realised. The scheme has been applied to a high voltage current transformer and the potential diagrams so obtained for a few test configurations are presented.

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