2002 Summer Meeting Awards

This letter describes a new approach for power transformer modeling that uses state variables in time domain. The modelled transformer has two windings. In this simulation, leakage inductors and magnetizing inductor are analyzed and assumed as state variables. As an example study, magnetizing inrush condition is analyzed and monitored in a laboratory environment. It is clear that the whole system is controllable and observable during magnetizing inrush. If these conditions change, there is an internal fault during energizing.     

2002 Summer Meeting Preview

Some simplification to Sunde's procedure, shown in IEEE Standard 80-2000 13.4.2.2, two-layer soil model by graphical method is proposed, with the introduction of a modified Sunde's curve. Comments on Appendix B of IEEE Standard 81-1983 are offered to correct some formula and improve concepts.