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…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The first question has been solved. Qii?
A 4-bus three-phase power system consists of the following equipment: • Generator 1 connected to bus 1 with a rated power of 20MVA, rated voltage of 20 kV, and a series reactance of 0.4 p.u. • Generator 2 connected to bus 5, with a rated power of 12MVA, rated voltage of 10 kV, and a series reactance of 0.3 p.u. Transformer 1 connected between buses 1 and 2, is wye-wye connected with a rated power of 20 MVA, rated voltages 20/100 kV, and a series reactance of 0.1 p.u. • Transformer 2 connected between buses 4 and 5, is wye-wye connected with a rated power of 12 MVA, rated voltages 12/110 kV, and a series reactance of 0.15 p.u. • Transmission Line 2-3 connects buses 2 and 3 and had a series impedance of 50 + j75 ohms. • Transmission Line 3-4 connects buses 3 and 4 and had a series impedance of 40 + j80 ohms. • Load A connected to bus 3 and abosorbes20 MW and 10 MVAR. The voltage at bus 3 is 105 kV. 1) Draw the one-line diagram for the system. 2) Draw the per-unit, per phase…
A hydro powered 50 MVA generator, with a synchronous reactance 0.33 p.u., delivers 40 MW over a transmission line of 0.15 p.u. reactance to an infinite system. A 3-phase short circuit transient fault occurs on the busbar between the generator and transmission line. Given that the generator emf is 1.4 p.u. prior to and during the fault and all reactances are to a 50 MVA base: Sketch the single line schematic diagram of the system. Determine the maximum load angle the generator can swing to without losing stability. i) ii) iii) iv) Sketch the corresponding power-angle curve for the system showing the accelerating and decelerating areas. Calculate the critical clearing angle of the system to keep its stability.
Q2\ The one-line diagram of a simple power system is shown in figure below. All impedances are expressed in per unit (pu) on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage. A three-phase fault occurs at bus 1 through a fault impedance of Zf = j0.08 per unit. Using Thevenin's theorem obtain the impedance to the point of fault and the fault current in per unit. Determine the bus voltages and line currents of generators during fault. X₁ = = 0.1 XT-0.1 3 1 to ojo XL=0.2 2 040 X₁ = 0.1
A 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and 0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The transmission line is connected to another Wye-Delta transformer and then to a three-phase load with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0. A single line-to-line fault occurs at the end of the transmission line on phases B and C. a. Draw the sequence networks b. Compute the Sequence currents c. Compute the faulted phase currents

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