Example Problems with Transformers

Problems 1-3

Kevin Starkey, Nick Christman, Aric Vyhmeister

Problem 1. An ideal step down transformer has a winding of $N_1=10\text{ turns and }{N}_2=2$ turns. If the input voltage is 1200V, what is the resulting output voltage?

Solution

By modifying equation 5-39 (Mohan 5-22) we can obtain an equation for the output voltage. That is,

$e_2=\frac{N_2}{N_1}{e}_1$.

With the information above we can now determine the output voltage:

$e_2=\frac{2}{10}1200=240V$

Error creating thumbnail: File missing Figure 1: Model for an ideal transformer.

Error creating thumbnail: File missing Figure 2: Magnetic circuit of an ideal transformer.