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Two three-phase generators supply a three-phase load through separate three-phase lines. The load absorbs 30 kW at 0.8 power factor lagging. The line impedance is
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Chapter 2 Solutions
EBK POWER SYSTEM ANALYSIS AND DESIGN
- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsarrow_forwardTwo SGs are supplying a load by Pwad with 0.9 PF lagging. Gi has a no-load frequency of 54H2, and a slope Spi=1.1MW/Hz. G2 has a no-load frequency of 51HZ, and a slope Spz=1.1MW/Hz. If the system frequency is 50HZ: 1. How much power is supplied by each generator? 2. What is the load power Pload? 3. Draw the house-diagram for this system. 4. Find the system frequency, if the governor set points on G1 are decreased by 1Hz.arrow_forward9. Based on figure shown below, determine a) Phase voltage and currents in load 1 and 2 b) The real, reactive and complex power supplied by the generator when switch S, is open c) The real, reactive and complex power supplied by the generator when switch S, is closed I 100 kVA (Y-connected) Load 1 ) 0.9 PF lag Load 2) 80 kw (delta-connected) 0.85 PF lag G 415 V Load 3 60 kVA (deta-connected) 0.85 PF lead A-connected [a) 239.6 V, 139.122-25.84° A, 415 V, 75.62-31.79° A] [b) 193.86/28.72" kVA, 170kW, 93.17 kvar] [c) 60Z-31.79° kVA, 221 kW, 615.6 kvar]arrow_forward
- 2. For the following system shown in the figure, calculate: a. The current through each phase of the load. b. The total real and reactive power of the three-phase load. c. The power factor at the load side. A 220 V 20° 220VL-120° U8 vol 152 I 220 VI20° 9. M.arrow_forwardVRY = 220 cis 0°, VYB = 220 cis -120° and VBR = 220 cis -240°. IR = 10 cis 0°. The load isbalanced and delta connected. Determine the: (a) Impedance per phase (b) Current perphase (c) Line currents.arrow_forwardDraw a 3-phase wye-connected generator with transmission lines connected to a 3-phase delta-connected load. Assume the lines connecting them have an inductance of j5 per phase. The generated voltages are 120 Vrms with phase 'a' having a phase angle of 0°. The loads are 10 Ohm resistors per phase. When drawing, make sure to label all 3 phases with voltage phasors, line inductances, and load resistances.arrow_forward
- PLEASE SHOW ALL THE STEPS AND THE WAY OF THE SOLUTION , BECAUSE I WANT TO LEARN HOW TO SOLVE, THANK YOU FOR YOUR UNDERSTANDINGarrow_forwardSolve 9arrow_forwardThere is an installation with two identical three-phase motors, 50 HP each and a power factor of 0.9 behind. When connecting a pure reactive element in parallel, the reactive power at the installation input is 50 kVARS, with a lagging power factor. We can say that: a) A capacitor bank was connected and the pf improved. b) A bank of inductors was connected and the pf improved. c) A capacitor bank was connected and the pf deteriorated. d) A bank of inductors was connected and the pf deteriorated. e) None of the above.arrow_forward
- The terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 1515 A, leading, with a phase angle of 30o. The total real power, drawn by the load would be:arrow_forwardSolve the question from point 4 to point 11arrow_forward2. A voltage applied to a load is V=208420°V and current through load is I=10 &-10° A. Find the following [SO 1] o complex power consumed by load • Is the load inductive or capacitive? o the power factor of the load o the reactive power consumed or generated by the load. o Does the load consume or supply reactive power? 3. A single phase motor draws 20 kVA at 0.70 lagging power factor from a 120 V source. The PUD desires to improve the power factor to 0.9 lagging by connecting a shunt capacitor bank across the terminals of the motor. Determine the size of the capacitor bank in VARS. Calculate the following: [SO 1] a) What are the initial load current, real and reactive powers of the load? b) What are the real and reactive power after adding the capacitor bank? c) What is the kVAr rating of the capacitor bank? (3) d) What is the load current? di) How is the load current affected by the load reactive power?arrow_forward
- Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning