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The Balanced ThreePhase WyeConnected LoadAuthor: E.E. Kimberly If three identical resistances R_{1} R_{2}, and R_{3} or three identical impedances Z_{1}, Z_{2}, and Z_{3} are connected in wye, as in Fig. 92 (a) or 92 (b), and are then connected to a source of threephase voltages, three equal currents will flow in the branches of the load circuit thus constructed. Voltage drops V_{01} = I_{1}Z_{1}, V_{02} = I_{2}Z_{2}, and V_{03} = I_{3}Z_{3} will appear across the impedances. If the impedances are purely resistive, as in (a), the currents will be in phase with the voltage drops across the respective impedances, as in (c). If the impedances contain both resistances and inductances, as in (b), the currents will lag the respective voltage drops by the angle θ, as in (d), where θ is the characteristic impedance angle as has previously been explained for the usual singlephase circuit. The phase currents in the impedances are, of course, the line currents I_{1}, I_{2}, and I_{3}.


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