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Influence of the Number of Nodes in the Winding’s Equivalent Circuit on the Surge Voltages in Transformers

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In this paper, the influence of the number of nodes in the winding equivalent circuit on the surge voltages in transformers is investigated. By comparing the voltages at all the points obtained by dividing the winding into several number of elements, it is shown that the minimum number of elements required must be at least 8 elements when the winding’s neutral is connected to earth and 14 elements when the winding’s neutral is insulated from earth to keep the computational error less than 1%.
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Transformer; Surge Voltage; Equivalent Circuit

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