A single-phase power system consists of a 480-V 60-Hz generator supplying a load ZLoad = 4 + j3 2 through a transmission line of impedance ZLine = 0.18 + j0.24 2. 1. If the power system is exactly as described above (see Figure a), what will the voltage at the load be? What will the transmission line losses be? 2. Suppose a 1: 10 step-up transformer is placed at the generator end of the transmission line and a 10: 1 step-down transformer is placed at the load end of the line (see Figure b). What will the load voltage be now? What will the transmission line losses be now?

A single-phase power system consists of a 480-V 60-Hz generator supplying a load ZLoad = 4 + j3 2 through a transmission line of impedance ZLine = 0.18 + j0.24 2. 1. If the power system is exactly as described above (see Figure a), what will the voltage at the load be? What will the transmission line losses be? 2. Suppose a 1: 10 step-up transformer is placed at the generator end of the transmission line and a 10: 1 step-down transformer is placed at the load end of the line (see Figure b). What will the load voltage be now? What will the transmission line losses be now?

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 3.9P

See similar textbooks

Similar questions

An ideal transformer has no real or reactive power loss. (a) True (b) False
For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) No
Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.
For an ideal 2-winding transformer, the ampere-turns of the primary winding, N1I1 is equal to the ampere-turns of the secondary winding, N2I2 (a) True (b) False
Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
1-A single-phase power system is shown in Figure below. The power source feeds a 100- kVA 14/2.4-kV transformer through a feeder impedance of 40.0 + j150 &. The transformer's equivalent series impedance referred to its low-voltage side is 0.12 + j0.5 &. The load on the transformer is 90 kW at 0.80 PF lagging and 2300 V. 40n j150n 0.12n j0.5n Load 90 kW 0.85 PF lagging source Source Feeder Transformer Load (transmission line) (a) What is the voltage at the power source of the system? (b) What is the power losses in the feeder?
Two transformersA and B are connected in parallel to a load of (2+j1.5) ohm.Their impedances in Secondary terms ZA = (0.15+j0.8) ohm and Zb = (0.1+j30.6)ohm Their no-load termind voltages are EA=200<0 V and EB=210<0 Volt.Find the power and Power factor of each transformer? %3D %3D
The impedance ZL in the circuit shown in Figure is adjusted for maximumaverage power transfer to itself.(a) What should be the value of ZL?(b) What is the maximum average power delivered to ZL?(c) What percentage of the average power delivered to the linear transformer is delivered to ZL?
What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator
10 A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and the number of turns of the low voltage winding is N2=34. The high voltage winding is energized with V1= 10 kV rms line-to-line and V2= 400 V rms line-to-line has been taken from the low voltage winding. What is the connection of the low voltage winding if the high voltage winding is Y-connected? Εισαγάγετε την απάντησή σας
Q2) For the linear transformer shown in figure below, find: a) Construct a frequency – domain equivalent circuit of the system b) Calculate the self – impedance of the primary circuit. c) Calculate the self – impedance of the secondary circuit. d) Calculate the impedance reflected into the primary winding. e) Calculate the scaling factor of the reflected impedance. 42 -j62 1:2 ww 120/0° V rms 20 N ll
6.5% ans ex A so kvA. 2o00/20 V, So He single-phase transformar has impedance drof of8% and resistance drop of 4%. Caleulate. The Requlation of the Thams former at full- Load o8 P.s Legging. also find The Power factor at which Voltage requlation will Be Zero. Sols 0.5 leading. s alculate The % Noltege Requlation af atransformar in w hich the Percantage resistance drof is 1% and Percentage dre is 6% when The Power fador is 0.8 lagging ) > unity aMS 38 % ans 1 % (シ→ 0.8 leading . amS - 2.2%