As we have considered that the system is perfectly balanced, the magnitude of current and voltage of each phase is the same. ... In the balanced star system, magnitude of phase voltage in each phase is V_ph. ∴ V_R = V_Y = V_B = V_ph. We know in the star connection, line current is same as phase current.

What is star connection?

: a method of connecting polyphrase circuits in which one end of each phase line is connected to a common neutral point that may be connected to the earth as protection against lightning or to a wire to which all the other neutral points of the system are connected — compare delta connection.

How much voltage is used in star connection?

In star connection, each winding receives 230 volts and in delta connection, each winding receives 415 volts.