Construction of vector diagrams

φn = φN = 0 coincide with the origin. It is convenient to direct the phase voltage vector in the opposite direction to the direction of the voltage.

To find necessary to with the opposite sign add .
Connect A with B, we get a vector etc. for and .
Phase voltage vectors form a star.
Linear stress vectors form an equilateral triangle.

The sum of the line voltages is always 0



The triangle is equilateral, therefore, i.e.