ELEMENTS OF POWER SYSTEM
SEM-IV, 2013
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)
Time: 3 hours
Total Marks: 100
Attempt any four:
5*4=20
- What do you understand by single line diagram of a
power system?
- Explain circuit breaker and isolator.
- Define terms- Skin effect, Kelvin's law, Proximity
effect.
- Write the configurations of transmission line.
- Briefly describe the power system elements.
- Explain the different kinds of supply system.
Attempt any four:
5*4=20
- Explain the Ferranti effect.
- Discuss performance of short transmission line.
- Discuss performance of long transmission line.
- Explain the single circuit transmission line.
- What do you mean by Surge impedance loading.
- How inductance is calculated of single phase
transmission line.
Attempt any two:
10*2=20
- A three equilateral transmission line has a total
corona loss of 55 KW at 110 KV and 100 KW at 114 KV. What is the descriptive
critical voltage between lines? What is the corona loss at 120 KV.
- Discuss the type of insulators and their applications.
- Explain the methods of reducing corona and
interference.
Attempt any two:
10*2=20
- A transmission line conductor has been suspended freely
from two towers and has been taken the form of a category that has
c=487.68 m. the span between the two towers is 152 m, and the weight of
the conductor is 1160 kg/km. Calculated the following:
(i) Length of the
conductor
(i) Sag
(ii) Maximum and minimum value of conductor tension using catanory method. - Write short note on sag template and vibration dampers.
- Discuss the effects of wind and ice loading on
transmission line.
Attempt any two:
10*2=20
- Discuss types of cables and their applications.
- Explain the Dielectric stress and grading of cables.
- Write short note on:
(i)Dielectric loss
(ii)Heating of cables.
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