Question

Sketch the equivalent balanced three phase circuit that represents Figure 1 and Figure 2. The source load configuration are as given by Table 1 below. You DON'T have to calculate the per unit value of each component. Please label the sources and impedances accordingly. SOURCE Star Star LOAD Star Delta

Answer 1

Sd: Star Source - Star load configuration!- Aon) I, 1 I! : Vis Vip Iz =(R+jx) N. Vo: Yes Vap Vap (c(or)3 BOYD2 2 Tetix) 2-[+j) Is Is Is Vas 12 Here, figure l') Vj = V8 = Vc = 38 AC aupply = Source voltages (phose changes) Vio=V20 = Vas i Vip = Vip = Vip = phase voltages(Phase angle changes) Viz, Y23, V3, = line voltages I,, IL, Iz are line currents and phase currents, because in stay connection, line and phase currents are same. 7 - load impedance is equal in all three phases as the Connection ~ balanced.

Stor Source - Delta load configuration - IL 112 Z IVA= Vis V31 I31 N Vsi 123 QV = V20 근 Vafort V=V38 I3L Yes I2L Figure (2) Here, Vis, Ne, V30 are phase voltages V23, V31,Viz are line. voltages Ill, Tzu, IaL are line currents 112, 123, I3) are phase currents Z - load impedance In delta connection, the phase and line voltages are equal.