Calculation of Maximum Short Circuit Electromagnetic Forces in the IPB Using Time Stepping Finite Element Method

Calculation of maximum short circuit electromagnetic forces is one of the most important factors in the mechanical design and optimization of isolated phase buses which is required by the manufacturing companies. In this paper, these forces as well as associated eddy currents and magnetic fields are calculated using finite element method. A software program is developed to find the worst conditions at which a maximum short circuit electromagnetic force occurs. It is shown that the maximum force strongly depends on the initial phase current angle at the instance the short circuit occurs. Two common enclosure material i.e. aluminum and steel are also compared regarding short circuit forces. Streszczenie..Maksymalne sily elektromagnetyczne zwarciowe to jeden z najwazniejszych parametrow mechanicznych przy projektowaniu i optymalizacji izolowanych szyn fazowych. W artykule obliczono te sily metodą elementu skonczonego przy uwzglednieniu prądow wirowych i i pola magnetycznego. Oprogramowanie obliczeniowe udoskonalono aby mozna bylo znaleźc krytyczne warunki wystepujące w stanach zwarcia. Wykazano ze maksymalna sila zalezy od początkowej fazy prądu w momencie zwarcia. Dwa typowe materialy obudowy - aluminium i stal zostaly porownane. (Obliczenia maksymalnej elektromagnetycznej sily zwarciowej w izolowanej szynie przy wykorzystaniu metody elementow skonczonych)

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