9.11 Simplified Transformer Equivalent Circuit

In analyzing networks containing ideal transformers, it is very convenient to replace the transformer by an equivalent circuit before the analysis. Consider the transformer circuit of Figure 9.32.

Figure 9.32: Circuit to be simplified

From (9.97)

The input impedance seen by the voltage source V _S in the circuit of Figure 9.32 is

and thus the circuit of Figure 9.32 can be replaced with the simplified circuit shown in Figure 9.33.

Figure 9.33: Simplified circuit for the transformer of Figure 9.32

The voltages and currents can now be found from the simple series circuit of Figure 9.33.