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University, Chennai Nov/Dec 2012 Examinations
Transmission and Distribution
To V Sem EEE
and explain the structure of Electrical Power Systems
in detail the various equipment’s used in HVDC converter station
are the various types of HVDC links?
overhead line has a span of 336m. The line is supported at water crossing from
two towers whose heights are 33.6m and 29m above water level. The weight of
conductor is 8.33N/m and tension in is not to exceed 3.34 × 10-4.
Find i) Clearance between the lowest point on the conductor and water ii)
horizontal distance of this point from the lower support
5.Explain why EHV transmission is
preferred? What are the problems involved in EHV AC transmission?
6.Explain the various factors affecting
the corona loss
7.A single phase transmission line has
two parallel conductors 3m apart, the radius of each conductor being 1cm.
Calculate the loop inductance per km length of the line if the material of the
conductor is i) copper and 2) Steel with relative permeability of 100
expression for inductance of a three phase line with unsymmetrical Spacing
9.Explain (i) Skin and Proximity effect
(ii)GMR and GMD
10.A three phase 5 km long transmission
line, having resistance of 0.5 Ω / km and
inductance of 1.76mH/km is delivering
power at 0.8 pf lagging. The receiving end voltage is 32kV. If the supply end
voltage is 33 kV, 50 Hz, find line current, regulation and efficiency of the
short notes on Shunt compensation
is a nominal π circuit? Find the ABCD constants for nominal π
13.Discuss briefly about (i) Pin type
insulator (ii) Suspension type insulator
14.Describe with the neat sketch, the
construction of a 3 core belted type cable.
15.What are different methods to improve
string efficiency of an insulator?
16.A single core cable of conductor
diameter 2cm and lead sheath of diameter 5.3 cm is to be used on a 66kv, 3
phase system. Two layer sheath of diameter 3.1cm and 4.2 cm are introduced
between the core and lead sheath. If the maximum stress in the layer is same,
find the voltages in the inter sheath
17.Explain the various types of grounding
the need for power system earthing
any two substation bus schemes in detail
briefly about the various types of bus bar arrangements in a substation.
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