2.7. Two impedances, Z1 = 0.8+ j5.6 N and Z2 = 8-j16 N, and a single-phase motor are connected in parallel across a 200-V rms, 60-Hz supply as shown in Figure 2.23. The motor draws 5 kVA at 0.8 power factor lagging. %3D I I3 0.8 S3 = 5 kVA at 0.8 PF lag 20020° V M j5.6 -j16 (a) Find the complex powers S1, S2 for the two impedances, and S3 for the motor. (b) Determine the total power taken from the supply, the supply current, and the overall power factor. (c) A capacitor is connected in parallel with the loads. Find the kvar and the capacitance in µF to improve the overall power factor to unity. What is the new line current?

2.7. Two impedances, Z1 = 0.8+ j5.6 N and Z2 = 8-j16 N, and a single-phase motor are connected in parallel across a 200-V rms, 60-Hz supply as shown in Figure 2.23. The motor draws 5 kVA at 0.8 power factor lagging. %3D I I3 0.8 S3 = 5 kVA at 0.8 PF lag 20020° V M j5.6 -j16 (a) Find the complex powers S1, S2 for the two impedances, and S3 for the motor. (b) Determine the total power taken from the supply, the supply current, and the overall power factor. (c) A capacitor is connected in parallel with the loads. Find the kvar and the capacitance in µF to improve the overall power factor to unity. What is the new line current?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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