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An algorithm for calculations of low frequency transformer transients [Elektronski vir]
Tokić, Amir ; Uglešić, Ivo ; Jakl, Franc
An algorithm for the calculations of low frequency transformer transients such as inrush current and ferroresonance is developed in this paper. The transformer nonlinearity is represented by ...nonlinear magnetizing inductance in parallel with nonlinear core loss resistance. Nonlinear curves: magnetizing current - flux linkage and core loss current - supply voltage are piecewise linearized. The stiff differential equation system, which describes transientsof electrical circuit, is solved by the A and L-stable backward differentiation formulas numerical method. It is shown that the BDF method completely eliminates numerical oscillation events. Simulation results of the developed algorithm are compared with the results obtained by Matlab/Power System Blockset and also with field measurements during a transformer energization. The proposed algorithm could be successfully applied on numerical calculations of transients with some other nonlinear elements ausch as surge arresters, power electronic elements, etc.
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