A small part of a power systems is shown in the single-line dlag-am in Figure 1. Grid Transformer 1 Overhead Transformer 2 Load transmission line 180 MVA 100 km long 150 MVA (112+j84) MVA x = 0.05 0/km 330/132 kV X = 8 % 132/11 kV X= 5 % 330 kV X = 10 0 Figure 1 Part of a power system (a) Briefly explain why over-head transmission lines are used for long distance transmission of electricity instead of underground cables. (b) What type of support would you recommend for the overhead transmission line in Figure 17 Briedy describe this type of support, clearly stating why you think it is the most suitable support for the overhead line in Figure 1. (c) Caleulate all the impedances in the power system in per-unit using a common base power of 200 MVA.

A small part of a power systems is shown in the single-line dlag-am in Figure 1. Grid Transformer 1 Overhead Transformer 2 Load transmission line 180 MVA 100 km long 150 MVA (112+j84) MVA x = 0.05 0/km 330/132 kV X = 8 % 132/11 kV X= 5 % 330 kV X = 10 0 Figure 1 Part of a power system (a) Briefly explain why over-head transmission lines are used for long distance transmission of electricity instead of underground cables. (b) What type of support would you recommend for the overhead transmission line in Figure 17 Briedy describe this type of support, clearly stating why you think it is the most suitable support for the overhead line in Figure 1. (c) Caleulate all the impedances in the power system in per-unit using a common base power of 200 MVA.

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 four-bus power system in Figure 2 has following equipment parameters: G1: 500 MVA 13.8 KV, xd"=x1=x2=0.20, x0=0.10pu G2: 750 MVA, 18 kv, xd"=x1=x2=0.18, x0=0.09pu G3: 1000 MVA, 20 kv, xd"=x1=0.17, x2=0.20, x0=0.09pu T1: 500 MVA, 13.8/500 kv, delta-wye, x=0.12pu T2: 750 MVA, 18/500 kv, delta-wye, x=0.10pu T3: 1000 MVA, 20/500 kv, delta-wye, x=0.10pu Each Line: X1 = 50 Ω; X0 = 150 Ω All per-unit reactance values are given on the respective equipment rating (voltage and power) as the base. The inductor connected to generator G3 neutral has a reactance of 0.028 Ω. (c) Determine the subtransient fault current in per-unit and in kA during a bolted three-phase fault at bus 1 in part b.
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