How to model a transformer?
In Microtran a transformer is usually modelled with the aid of mtdata, which takes the nameplate and test sheet data of a transformer and converts it into a coupled inductance matrix that correctly reproduces open and short circuit tests at power frequency, for three phase units as well as single-phase banks. This basic type of modelling produces reasonable answers from dc to 5 kHz or so. The asymptotic behaviour of the transformer at higher frequencies can be modelled by placing capacitances at the terminals and between windings. To model saturation and hysteresis, nonlinear branches are added externally to the basic power frequency model. Any number of windings can be modelled, and phase shift is automatically taken into account through proper winding connection. An ideal transformer model does exist, but it is used primarily to provide galvanic isolation (e.g., voltage sources not connected to ground). Plot a variable against another Using mtPlot, go to “curve math” and select “curv
