MM0704, Lesson 4
Figure 4-6. Transformer Ratio.
One of the uses of a transformer is getting a phase shift between circuits. You can use vectors to show how this is
The first consideration is that of a transformer with an open secondary (no load). Disregarding any resistance of the
winding, the primary circuit contains only inductance. In figure 4-7A, using Ep as the base vector, Ip can be plotted
lagging the applied voltage by 90 since the primary circuit is inductive.