Question: 2. A Y-connected three-phase load, shown in Fig. P2.1, is supplied from a 400-V, 3-wire symmetrical system ABC. The unbalanced load has impedances: ZAN=

2. A Y-connected three-phase load, shown in Fig. P2.1, is supplied from a 400-V, 3-wire symmetrical system ABC. The unbalanced load has impedances: ZAN= 103+j10 2, ZBN = 20 +j203 2, and ZCN 0-j10 S2. (a) Find the line-to-neutral voltages Vab, Vbe, and Ve ca* (b) Find the line-to-neutral voltages Van' Vbn and V cn* (c) Find the line currents IA, IB, and Icc. VAN, VBN' VCN (d) Find the voltages, VA (e) Find the line-to-line voltages VAB, VBC, and VCA (f) (i) Find the total complex power of the load. (ii) Determine the total complex power from source. (g) Draw the total phasor diagram of the line current phasors in part (c). TaA a A V Van cn n bn b ZBN bB B Icc Fig. P2.1 + ZAN N ZCN C

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