Subsection 4.3.3 Wye Circuit
In a wye or star configuration, three components are connected at a common point, forming a Y shaped pattern. The common point is designated \(N\) for neutral, and the three power lines, designated \(A\text{,}\) \(B\text{,}\) and \(C\text{,}\) are connected to the free ends of the three components.
In three phase circuits, the voltage measured from line to line is called the line voltage, \(V_L\text{,}\) and the voltage measured across a component is called the phase voltage ,\(V_\phi\text{.}\)The line current, \(I_L\) ,is the current flowing in a power line, while the phase current, \(I_\phi\text{,}\) is the current flowing through a component. In a balanced system, all three line voltage are the same, as are all three line currents.
In a three-phase wye circuit,
\begin{align}
V_L \amp= \sqrt{3} V_\phi.\tag{4.3.2}\\
I_L \amp = I_\phi\tag{4.3.3}
\end{align}
