Page 434 - Basic Electrical Engineering

Figure 4.7 Delta connection of three-phase windings: (a) three-phase three-wire delta connection; (b)
connection scheme of windings forming a delta

4.5.3 Relationship of Line and Phase Voltages, and Currents in a Star-

connected System

Consider the balanced star-connected system as shown in Fig. 4.8

Suppose load is inductive and, therefore, current will lag the applied
voltage by angle ϕ. Consider a balanced system so that the magnitude of

current and voltage of each phase will be the same.

i.e., Phase voltages, V = V = V = V Ph
B
Y
R
Line current, I = I = I = I L
Y
R
B
Line voltage, V = V RY = V YB = V BR
L

Phase current, I = I = I = I B
R
Y
Ph
I = I for star connection as the same phase current passes through the lines
L
PH
to the load.