부산대학교 도서관

A three-phase, two-winding transformer's model is presented in the paper. The triplex core configuration is assumed in the transformer's model. Nonlinear magnetizing curves are piecewise linearized. Input winding capacitances can be lumped to the transformer's terminals. A stiff differential system in state space, describing transformer's transient behavior, is solved by the L-stable backward differentiation formulas numerical rule. BDF compared to trapezoidal rule shows better stability properties. A computer program is developed for generation of variable state waveforms. The developed program is suitable for simulations of low-frequency three-phase transformer transients such as inrush currents and ferroresonance. Results of the developed program are compared to MATLAB/power system blockset results.