1. A three-phase four wire 440 V, 50 Hz system supplies to a star-connected load with Z = 10 20°, Z=15230°, and Z = 102-30°. Find the line currents, the neutral current, and the total power. 18 Chapter 1 Introduction to High-Voltage Engineering 2. Calculate the ideal power transfer capability in MW of an ac 1200 kV, 900 km line to be commissioned from Guwahati to Patna having per-phase line inductance of 1.2 mH/km and capacitance of 15.7 nF/km. 3. In Problem 2, if the surge impedance of the existing 400 kV lines in this area is 250 2, how many three-phase circuits of these lines can be replaced by a single three-phase circuit of 1200 kV line? 4. A single-phase ac voltage of 230 V is applied to a series circuit whose impedance is 10 260°. Find active and reactive power of the circuit. What will be power factor of circuit? 5. Repeat Problem 4 with ac voltage of 120 V. Compare results. 1. 25.420°, 16.94 z −150°, 25.4 2150°, 12.44 2159.42° A 15.76 kW and 1.074 kVAr 2. 5208.52 MW 3. 8 circuits 4. 10.58 kW, 6.1 kVAr, 0.5 5. 2.88 kW, 1.66 kVAr, 0.5

1. A three-phase four wire 440 V, 50 Hz system supplies to a star-connected load with Z = 10 20°, Z=15230°, and Z = 102-30°. Find the line currents, the neutral current, and the total power. 18 Chapter 1 Introduction to High-Voltage Engineering 2. Calculate the ideal power transfer capability in MW of an ac 1200 kV, 900 km line to be commissioned from Guwahati to Patna having per-phase line inductance of 1.2 mH/km and capacitance of 15.7 nF/km. 3. In Problem 2, if the surge impedance of the existing 400 kV lines in this area is 250 2, how many three-phase circuits of these lines can be replaced by a single three-phase circuit of 1200 kV line? 4. A single-phase ac voltage of 230 V is applied to a series circuit whose impedance is 10 260°. Find active and reactive power of the circuit. What will be power factor of circuit? 5. Repeat Problem 4 with ac voltage of 120 V. Compare results. 1. 25.420°, 16.94 z −150°, 25.4 2150°, 12.44 2159.42° A 15.76 kW and 1.074 kVAr 2. 5208.52 MW 3. 8 circuits 4. 10.58 kW, 6.1 kVAr, 0.5 5. 2.88 kW, 1.66 kVAr, 0.5

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.48P: With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a...

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