Surge Phenomena in Transformers
For designing the insulation system of a transformer for withstanding overvoltage tests, voltage stresses within its windings need to be determined. For this purpose, voltage distributions within the transformer windings for the specific test voltages are calculated. For AC test voltages at power frequency, the voltage distribution is linear with respect to the number of turns and can be calculated exactly. For the calculation of the impulse voltage distribution in the windings, they are required to be simulated in terms of an equivalent circuit consisting of lumped R, L and C elements. A number of accurate methods are reported in the literature for the computation of the response of the windings to voltages, ...
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