Problem 81-2
Source: Problem elaborated by the author of the site.
Be the voltage VBC = 440 ∠220°. Find the corresponding phase voltage.
Solution of the Problem 81-2
In this case, to find the phase voltage we must divide the line voltage by root of three (eq. 81-02) and the angle should be delayed by 30°. Like this:
VBN = (VBC / √3) ∠(220°-30°)
Note that both VBC and VBN, has as the first index the letter B. Performing the calculation: