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.

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
Chapter6: Power Flows
Section: Chapter Questions
Problem 6.61P
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A small part of a power systems is shown in the single-line diagram in Figure 1.
Grid
Transformer 1
Overhead
Transformer 2
Load
tot
transmission line
100 km long
x = 0.05 0/km
150 MVA
(112+j84) MVA
180 MVA
132/11 kV
X = 5 %
330 kV
330/132 KV
X = 10 a
X = 8 %
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) Calculate all the impedances in the power system in per-unit using a common base power of 200 MVA.
(d) Sketch an impedance diagram of the power system and calculate the totalimpedance between the source
and the load in per-unit.
Transcribed Image Text:A small part of a power systems is shown in the single-line diagram in Figure 1. Grid Transformer 1 Overhead Transformer 2 Load tot transmission line 100 km long x = 0.05 0/km 150 MVA (112+j84) MVA 180 MVA 132/11 kV X = 5 % 330 kV 330/132 KV X = 10 a X = 8 % 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) Calculate all the impedances in the power system in per-unit using a common base power of 200 MVA. (d) Sketch an impedance diagram of the power system and calculate the totalimpedance between the source and the load in per-unit.
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