A three-phase 630 kV, 50 Hz, 400 km completely transposed long transmission line, hasthe following positive sequence impedance and admittance parameters.z = 0.015 + j 0.25 0/kmy = j 4 x 10-6 S/kmIdentical shunt reactors are connected from each phase conductor to neutral at both endsof the line providing 80% compensation during light load conditions. The reactors areremoved during heavy load conditions. Full load is 0.75 kA at 0.95 lagging power factorand at 600 kV. Assuming the sending end voltage remains constant. Determine thefollowing:1. Using the equivalent r circuit find the exact ABCD parameters of the transmissionline.

Answered: A three-phase 630 kV, 50 Hz, 400 km…

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 5.41P

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A 200-km, 230-kV, 60-Hz, three-phase line has a positive-sequence series impedance z=0.08+j0.48/km and a positive-sequence shunt admittance y=j3.33106S/km. At full load, the line delivers 250 MW at 0.99 p.f. lagging and at 220 k V. Using the nominal circuit, calculate: (a) the ABCD parameters, (b) the sending-end voltage and current, and (c) the percent voltage regulation.
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The 500-kV, 60-Hz, three-phase line in Problems 4.20 and 4.41 has a 300-km length. Calculate: (a) Zc, (b) (l), and (c) the exact ABCD parameters for this line. Assume a 50C conductor temperature.
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