- 3 Refer To The Three Phase Y Connected Ac Circuit Shown In Figure 3 With The Parameters 50 Hz Z 1 12 2 Per Phas 1 (44.2 KiB) Viewed 36 times
3. Refer to the three-phase Y-connected ac circuit shown in Figure 3 with the parameters 50 Hz, Z,= (1 + 12) 2 (per phase). Vpce =480 V (line-to-line, rms value), f = 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 Z₁yY= (100+120) Load 2: A-connected and balanced, the delta per-phase impedance is . Z₂A = (180 + j120) n. Load 3: S₁ = 9 KVA, the power factor is 0.6 (lagging). Vpr Load 1 V₁ Z₁ Iu Load 2 To Load 3 ILS Figure 3 (a) Calculate the currents 112 113 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 voltaç source VST [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]