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For designing the high voltage insulation system for power transformers, the voltage stresses arising in a transformer must be precisely known. The different type of voltage stress can be determined from the voltages appearing at the terminals and the knowledge of the geometry of the windings. The distribution of the powerfrequency overvoltages does not differ very much from the system frequency. It is proportional to the number of the turns of the windings, and it is uniform within each individual winding. The distribution of the transient overvoltages depends on the capacitances and inductances of the windings. In this paper we present an accurate, 2D finite element method based capacitance calculation routine, which is compared with the classical analytical calculation [1].

Transzformátor tekercselések helyettesítő kapacitásainak meghatározása koncentrált paraméterű modell számára analitikus és végeselem módszerrel