Abstract
In this paper a methodology for reducing the edge steepness of electromagnetic surges in gas-insulated substations is presented. The damping of the waves results from the utilization of the skin effect by means of a semiconducting coating of the substation's inner conductor. An analytical calculation of the attenuation factor shows the behaviour of a surge's different frequency portions. FDTD-simulations confirm the flattening of the wave fronts by the damping layer. Finally, a comparison with an uncoated structure shows the advantages of the coating.
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