3. Refer to the three-phase Y-connected ac circuit shown in Figure 3 with the parameters Vpcc = 480 V (line-to-line, rms

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3 Refer To The Three Phase Y Connected Ac Circuit Shown In Figure 3 With The Parameters Vpcc 480 V Line To Line Rms 1 (102.23 KiB) Viewed 44 times

3. Refer to the three-phase Y-connected ac circuit shown in Figure 3 with the parameters Vpcc = 480 V (line-to-line, rms value), f = 50 Hz, Zç = (1 + j2) (per phase). The impedance Z, includes the Thevenin equivalent impedance and the line impedance. The loads' parameters are: - Load 1: Y-connected and balanced, the per-phase impedance is Z₁,Y (100+ j20) n. Load 2: A-connected and balanced, the delta per-phase impedance is Z2A = (180 + j120) n. Load 3: S3 = 9 KVA, the power factor is 0.6 (lagging). Vpcc #Load 1 V₂ Zs Is IL1 #Load 2 IL₂ #Load 3 IL3 Figure 3 (a) Calculate the currents IL₁,L2,L3 and Is (Y-currents). [8 marks] (b) Calculate active and reactive power absorbed by Load 1 and Load 2 (the sum of the three phases). [6 marks] (c) Calculate the voltage source Vs. [3 marks] (d) Calculate the active and reactive powers provided by the source (the sum of the three phases). [4 marks] (e) Calculate the total impedance seen by the source. [4 marks]