5.14 5.15 A 500-km, 500-kV, 60-Hz, uncompensated three-phase line has a positive- sequence series impedance z = 0.03 +0.35 2/km and a positive- sequence shunt admittance y = j4.4 × 106 S/km. Calculate: (a) Z (b) (yl), and (c) the exact ABCD parameters for this line. At full load, the line in Problem 5.14 delivers 900 MW at unity power factor and at 475 kV. Calculate: (a) the sending-end voltage, (b) the sending-end current, (c) the sending-end power factor, (d) the full-load line losses, and (e) the percent voltage regulation.

5.14 5.15 A 500-km, 500-kV, 60-Hz, uncompensated three-phase line has a positive- sequence series impedance z = 0.03 +0.35 2/km and a positive- sequence shunt admittance y = j4.4 × 106 S/km. Calculate: (a) Z (b) (yl), and (c) the exact ABCD parameters for this line. At full load, the line in Problem 5.14 delivers 900 MW at unity power factor and at 475 kV. Calculate: (a) the sending-end voltage, (b) the sending-end current, (c) the sending-end power factor, (d) the full-load line losses, and (e) the percent voltage regulation.

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

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.33MCQ

See similar textbooks

Similar questions

Transmission line conductance is usually neglected in power system studies. True False
Considering two parallel three-phase circuits that are close together, when calculating the equivalent series-impedance and shunt-admittance matrices, mutual inductive and capacitive couplings between the two circuits can be neglected. True False
Figure 4.34 shows double-circuit conductors' relative positions in segment I of transposition of a completely transposed three-phase overhead transmission line. The inductance is given by L=2107lnGMDGMRH/m/phase Where GMD=(DABeqDBCeqDACeq)1/3 With mean distances defined by equivalent spacings DABeq=(D12D12D12D12)1/4DBCeq=(D23D23D23D13)1/4DACeq=(D13D13D13)1/4 And GMR=[ (GMR)A(GMR)B(GMR)C ]1/3 with phase GMRs defined by (GMR)A=[ rD11 ]1/2;(GMR)B=[ rD22 ]1/2;(GMR)C=[ rD33 ]1/2 and r is the GMR of phase conductors. Now consider a 345-kV, three-phase, double-circuit line with phase-conductors GMR of 0.0588 ft and the horizontal conductor configuration shown in Figure 4.35. Determine the inductance per meter per phase in Henries (H). Calculate the inductance of just one circuit and then divide by 2 to obtain the inductance of the double circuit.
For a single-phase two-conductor line with composite conductors x and y, express the inductance of conductor x in terms of GMD and its GMR.
The following parameters are based on a preliminary line design: per unitVS=1.0, VR=0.9 per unit, =5000km,Zc=320,=36.8. A three-phase power of 700 MW is to be transmitted to a substation located 315 km from the source of power. (a) Determine a nominal voltage level for the three-phase transmission line, based on the practical line-loadability equation. (b) For the voltage level obtained in part (a), determine the theoretical maximum power that can be transferred by the line.
Answer all sub parts of question...
Question 3
A 60-Hz, 230-mile, three-phase overhead transmission line has a series impedance z = 0.8431279.04° 0/mi and a shunt admittance y = 5.105 x 10-6290° S/mi. The load at the receiving end is 174 MW at unity power factor and at 215 kV. Using per-unit calculations, determine the sending-end line-to-line voltage (in kV) and line current (in A). (Enter the magnitudes. Use a base of 174 MVA and 215 kV.) voltage 154.2 current x kv A
Please help
The equivalent circuit of a single phase short transmission line is shown in Figure Q4 (b). Here, the total line resistance and inductance are shown as lumped instead of being distributed. i) Sketch the phasor diagram and assess with by labeling the details for the A.C. series circuit shown in Figure Q4 (b) for the lagging power factor at load point (Vn). ii) Summarize, the impact of voltage regulation and efficiency, if the line resistance and line increases are doubled Figure Q4(b). R XL Vs Vn Figure Q4(b) Load
The parameters of transposed overhead transmission line are given as: self reactance Xs=0.4 ohm/km and mutual reactance Xm=0.1 ohm/km. The positive sequence reactance X1 and zero sequence reactance X0, respectively, in ohm/km are (A) 0.3, 0.2 (B) 0.5, 0.2 (C) 0.5, 0.6 (D) 0.3, 0.6
Q4(b) The equivalent circuit of a single phase short transmission line is shown in Figure Q4(b). Here, the total line resistance and inductance are shown as lumped instead of being distributed. i) Sketch the phasor diagram and assess with by labeling the details for the A.C. series circuit shown in Figure Q4(b) for the lagging power factor at load point (Vn). ii) Summarize, what if the load change from low value to high value shown in Figure Q4(b). R XL el Vs Vn Figure Q4(b) Load