MM0704, Lesson 4
Figure 4-6. Transformer Ratio.
Phase Relationships
One of the uses of a transformer is getting a phase shift between circuits. You can use vectors to show how this is
done.
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.
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