- Urgent Please 1 (89.66 KiB) Viewed 25 times
URGENT PLEASE!
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answerhappygod
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URGENT PLEASE!
URGENT PLEASE!
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, Z₁ = (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 Z₁y = (100+ j20) n. Load 2: A-connected and balanced, the delta per-phase impedance is ZZA = (180 + j120) n. Load 3: S3 = 9 KVA, the power factor is 0.6 (lagging). V pcc #Load 1 Vs Zs 522 IL1 Load 2 Load 3 IL3 Figure 3 (a) Calculate the currents L₁,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]
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, Z₁ = (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 Z₁y = (100+ j20) n. Load 2: A-connected and balanced, the delta per-phase impedance is ZZA = (180 + j120) n. Load 3: S3 = 9 KVA, the power factor is 0.6 (lagging). V pcc #Load 1 Vs Zs 522 IL1 Load 2 Load 3 IL3 Figure 3 (a) Calculate the currents L₁,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]