So i'm doing a matlab simulation of delta wye transformer and would need to show the phase shift between voltages. Here is a picture of input voltages so how would I show on this graph mathematically or graphically that these voltages are 120 degrees apart?
A slightly off-beat approach:
Figure 1. Intersection of the curves.
Because they're sinewaves we can use some trig functions.
- At (1) the blue phase is at 0. Let's call this 0°.
- At (2) the blue phase is at 2400. That will be 90°.
- At (3) and (4), the intersection point with the other phases, the voltage is 1200 which is half the peak. We know that \$ sin\ a = 0.5 \$ has two solutions: 30° and 150° and that these are 120° apart.