ABSTRACT
This chapter deals with modeling aspects of transformers for various steady-state and transient studies involving connected power systems. Transformers are important constituents of any power system network. The modeling of a three-phase transformer is an important task while doing the power flow analysis of a distribution system. For a given transformer with its vector group, all branch voltages are expressed in terms of branch currents and self/mutual impedances using Kirchoff’s Voltage Law. A deeper understanding and modeling of nonlinear magnetic circuit behavior is essential while analyzing ferroresonance phenomena. An important function of a transformer is to regulate the voltage at the point of its connection to the power system network. Tap changers can be used to control the flow of reactive and active powers as well through magnitude-regulating and phase-shifting transformers, respectively. The possible influence of the cable length and the type of breaker design should be investigated at the design stage through user-manufacturer interactions.
