Q2.In relation to AC transmission system,(a) Assuming a lossless short line has a reactance of X, discuss (using phasordiagrams that show receiving & sending end voltages and voltage dropsacross R &X) the impact of the following actions on the receiving endvoltage and on voltage regulation when:(i) A lagging power factor load at the receiving end is increased.(ii) A unity power factor load at the receiving end is increased.(iii) A leading power factor load at the receiving end is increased.(b) For the system that is shown in Figure Q2, use all relevant data from thediagram to:(i) Discuss the reasons that caused the reactive power to flow backinto the generator and the necessary actions that may be taken toavoid this occurrence.(ii) Discuss the changes that may occur under surge impedance loadingof the system in Figure Q2 and the reasons for these changes. Userelevant equation/s to support your discussion and in so doing youmay assume that the line is lossless.Total system losses47.19 MWOneTwo1039MWO Mvar1086 MW1086.20 MW1039.00 MW-193 Mvar-193.43 Mvar-0.00 MvarAmps0.97 pu-10.66 deg1.00 pu0.00 DegFigure Q2 A two bus power system.

Answered: Image /qna-images/answer/22592851-419f-4bfd-9fa6-98051488ead5.jpg

In relation to AC transmission system, (a) Assuming a lossless short line has a reactance of X, discuss (using phasor diagrams that show receiving & sending end voltages and voltage drops across R &X) the impact of the following actions on the receiving end voltage and on voltage regulation when: (i) A lagging power factor load at the receiving end is increased. (ii) A unity power factor load at the receiving end is increased. (iii) A leading power factor load at the receiving end is increased.

In relation to AC transmission system, (a) Assuming a lossless short line has a reactance of X, discuss (using phasor diagrams that show receiving & sending end voltages and voltage drops across R &X) the impact of the following actions on the receiving end voltage and on voltage regulation when: (i) A lagging power factor load at the receiving end is increased. (ii) A unity power factor load at the receiving end is increased. (iii) A leading power factor load at the receiving end is increased.

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

Chapter5: Transmission Lines: Steady-state Operation

Section: Chapter Questions

Problem 5.64P

See similar textbooks

Similar questions

A 40-km, 220-kV, 60-Hz, three-phase overhead transmission line has a per-phase resistance of 0.15/km, a per-phase inductance of 1.3263 mH/km, and negligible shunt capacitance. Using the short line model, find the sending-end voltage, voltage regulation, sending-end power, and transmission line efficiency when the line is supplying a three-phase load of (a) 381 MVA at 0.8 power factor lagging and at 220 kV and (b) 381 MVA at 0.8 power factor leading and at 220 kV.
If the per-phase line loss in a 70-km-long transmission line is not to exceed 65 kW while it is delivering 100 A per phase, compute the required conductor diameter if the resistivity of the conductor material is 1.72108-m.
A three-phase power of 460 MW is transmitted to a substation located 500 km from the source of power. With VS=1. per unit, VR=0.9 per unit, =5000 km, Zc=500, and =36.87, determine a nominal voltage level for the lossless transmission line based on Eq. (5.4.29) of the text. Using this result, find the theoretical three-phase maximum power that can be transferred by the lossless transmission line.
A 500-kV, 300-km, 6()-Hz, three-phase overhead transmission line, assumed to be lossless, has a series inductance of 0.97 mH/krn per phase and a shunt capacitance of 0.0115F/km. per phase. (a) Determine the phase constant p, the surge impedance Zc, velocity of propagation v, and the wavelength of the line (b) Determine the voltage, current, real and reactive power at the sending end, and the percent voltage regulation of the line if the receiving-end load is 800 MW at 0.8 power factor lagging and at 500 kV.
A single-phase overhead transmission line consists of two solid aluminum conductors having a radius of 3 cm with a spacing 3.5 m between centers. (a) Determine the total line inductance in mH/m. (b) Given the operating frequency to be 60 Hz, find the total inductive reactance of the line in /km and in/mi. (c) If the spacing is doubled to 7 m, how does the reactance change?
The 100-km, 230-kV, 60-Hz, three-phase line in Problems 4.18 and 4.39 delivers 300 M VA at 218 kv to the receiving end at full load. Using the nominal circuit, calculate the ABCD parameters, sending-end voltage, and percent voltage regulation when the receiving-end power factor is (a) 0.9 lagging, (b) unity, and (c) 0.9 leading. Assume a 50C conductor temperature to determine the resistance of this line.
Consider a long radial line terminated in its characteristic impedance Zc. Determine the following: (a) V1/I1, known as the driving point impedance. (b) | V2 |/V1|, known as the voltage gain, in terms of al. (c) | I2 |/| I1 |, known as the current gain, in terms of al. (d) The complex power gain, S21/S12, in terms of al. (e) The real power efficiency, (P21/P12)=, terms of al. Note: 1 refers to sending end and 2 refers to receiving end. (S21) is the complex power received at 2; S12 is sent from 1.
Transmission line conductance is usually neglected in power system studies. True False
The 500-kV, 60-Hz, three-phase line in Problems 4.20 and 4.41 has a 180-km length and delivers 1600 M W at 475 kv and at 0.95 power factor leading to the receiving end at full load. Using the nominal circuit, calculate the (a) ABCD parameters, (b) sending-end voltage and current, (c) sending-end power and power factor, (d) full-load line losses and efficiency, and (e) percent voltage regulation. Assume a 50C. conductor temperature to determine the resistance of this line.
In three-phase short transmission line with end-of-line interphase voltage UR = 31,5kV , from the end of the line active power absorbed PR = 9000 kW, end of line power factor is cosφ = 0,70 (end) and the length of the line is l = 20km, The resistance of the line per km is R'= 0,125 Ohm/km, the reactance per km is X'= 0,375 Ohm/km.With the help of given information; a) Calculate the current drawn from the line (IR) as a phasor. b) Calculate the line-to-line-neutral voltage (VS) as a phasor, determine the effective line-to-line voltage (US) Calculate its value. c) Calculate the line head power factor, active and reactive power drawn from the line head, d) Draw the phasor diagram of the system. ..
Geometric mean radius of a 3-phase transmission line of 422 kV, 220 km length 22 mm dir. The roughness factor of the conductor is 0.82 and the geometric mean length between phases is 11 m. Air pressure along the line is 720 mm Hg and the temperature is 22 ° C. In this transmission line; a) - Calculate the corona voltage and the voltage at which ionization begins with impingement particles. b) - Find the total corona loss in the three phase system for the operating voltage with the Peek formula c) - Find the total corona loss for 1% increase in operating voltage.
A 3 phase, 50 Hz, 150 km line has a resistance, inductive reactance and capacitive shunt admittance of 0.1Ω, 0.5Ω, and 3 x 10-6 S per km per phase. If the line delivers 50 MW at 110 kV and 0.8 pf lagging, Using nominal "T" method, determine: a. Sending end current b. Line value of the sending end voltage c. Transmission efficiency d. Voltage regulation e. Sending end power factor