A. Tokic and I. Kapetanovic (Bosnia and Herzegovina), and J.A. Dias Pinto (Portugal)
Stiff differential equations, Stoer rule, inrush current, temporary overvoltages, metal-oxide surge arresters
A non-linear transformer model in transient process is proposed in this paper and can be used successfully in relatively low frequency cases. A non-linear magnetization curve is presented with a finite number of linear regions. “Stiff” differential equations, which described a condition of electrical circuit during the transformer energization, are solved by semi implicit Stoer rule. Sufficient number of regions for an accurate approximation of the magnetization curve in a transient are considered. Also, the most inconvenient transformer switching-in moments are determined. It was shown that temporary overvoltages originated during the transformer energization, may significantly affect metal-oxide surge arresters. Since the electric power system of Bosnia and Herzegovina is really weak, there is a possibility for appearing overvoltages which were mentioned above.
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