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Feb 2016

This document is an examination paper for T.E. (Electrical) students on the topic of Power System - II, consisting of six questions with options to choose between pairs. The questions cover various aspects of transmission lines, including ABCD parameters, complex power, HVDC systems, and corona phenomena. Candidates are instructed to draw neat diagrams and use calculators, with a total of 30 marks available for the exam.

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10 views2 pages

Feb 2016

This document is an examination paper for T.E. (Electrical) students on the topic of Power System - II, consisting of six questions with options to choose between pairs. The questions cover various aspects of transmission lines, including ABCD parameters, complex power, HVDC systems, and corona phenomena. Candidates are instructed to draw neat diagrams and use calculators, with a total of 30 marks available for the exam.

Uploaded by

ssupugade07
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Total No. of Questions :6] SEAT No.

:
P82 APR. -16/TE/Insem. - 14
[Total No. of Pages :2

T.E.(Electrical)
POWER SYSTEM -II
(2012 Course) (Semester - II)
Time : 1Hour] [Max. Marks :30
Instructions to the candidates:
1) Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q6.
2) Neat diagrams must be drawn wherever necessary.
3) Figures to the right side indicate full marks.
4) Use of calculator is allowed.
5) Assume suitable data if necessary.

Q1) a) Determine ABCD parameters of a long transmission line with 160km


length having r = 0.1157 Ω /km,L = 0.00127 H/km and C=0.00875 μ F/
Km.Assume frequency is 50Hz. [6]
b) Explain surge impedance & surge impedance Loading. [4]

OR
Q2) a) Determine sending end complex power, of a transmission line delivering
50MVA at 132kV, 50Hz and 0.8 power factor lagging. The ABCD
constants of transmission lines are A = D = 0.9855 ∠ 0.32°,
B= 67.3 ∠ 68.69° Ω , [6]
b) Write a short note on Complex power. [4]
Q3) a) Compare EHV transmission with HVDC transmission. [5]

b) Give the classification of HVDC transmission system in detail. [5]

OR

Q4) a) Draw single line diagram of HVDC transmission system and explain the
components used (any four). [6]

b) Explain constant current control characteristic of HVDC transmission


system. [4]

P.T.O.
Q5) a) In three phase overhead line the conductors have each diameter of 30mm
and are arranged in the form of an equilateral triangle.Assuming fair
weather conditions air density factor is 0.95 and irregularity factor 0.95.
Find the minimum spacing between the conductors if the disruptive critical
voltage is not to exceed 230kV between lines. Breakdown strength of air
may be assumed to be 30kV Per cm (peak). [6]

b) Explain phenomena of corona in EHV transmission lines. [4]

OR

Q6) a) Estimate the corona loss per phase per km by using Peek’s formula for
three phase 110kV, 50Hz, 150km long transmission line consisting of
three conductors each of 10mm diameter and spaced 2.5m apart in an
equilateral triangle formation. The temperature of air is 30°C and the
atmospheric pressure of 75mm of Hg.Take the irregularity factor as 0.85.
Ionization of air may be assumed to take place at a maximum voltage
gradient of 30 kV. [6]

b) What are factors and conditions affecting corona? Explain in detail. [4]

tu tu tu

TE/Insem.-14 2

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