Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2017-2018 NEE601 Power System Analysis Question Paper
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BTECH
(SEM?VI) THEORY EXAMINATION 2017-18
POWER SYSTEM ANALYSIS
Time: 3 Hours T 0tal Marks: 100
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 10 = 20
a) What is single line diagram of power system from generating station to utilization
level?
b) What is impedance and reactance diagram?
0) De?ne sub-transient reactance.
d) Write a short note on feeder reactors.
e) Explain the matrix partitioning in load ?ow study.
1) De?ne: Load bus, Generator bus and Slack bus.
g) Explain the methods of improving steady state stability.
h) Explain the swing curve.
1) De?ne: characteristic impedance loading and surge impedance loading.
j) Find the CIL of 200 kV transmission line.
SECTION B
2. Attempt any three of the following: 10 x 3 = 30
a) Obtain per unit reactance diagram of the power system shown in figure. The reactance
data of the elements are given as ?
M? 33/11 33/62
? M4:?
#31:; .HA
Fig. 1.4.2 One line representation of a simple power system
(\b;
II
G1: 30 MVA 10.5 kV X" = 1.6 Q
62: 15 MVA 6.6 kV X"=1.2?2
G3: 25 MVA 6.6 kV X" = 0.56 9
T1: 15 MVA 33/11 kV X = 15.2 (2 pm'plmsv 0!] II! 5101'
T2: 15 [VIVA 33/62 kV X = '16 (2 per phase (m [If sidu
Trmzsmission Linc 20.5 9 per phase
Land A 40 MW 11 kV (L?L) 0.9 lugging pf,
Lond B 40 MW 6.6 kV (L?L) 0.85 lugging pf
b)
C)
d)
b)
Explain the switching operation in a series R?L circuit.
In the 3 bus system shown in figure the series and shunt impedances of line (L1) is
(14.3+j97) ohm and (?j3274) ohm, line (L2) is (7.13+j48.60) ohm and (?j6547) ohm,
and line (L3) is (9.38+j64) ohm and (?j4976) ohm respectively, find [YBus].
CD (3
Derive the swing equation for a machine connected to an infinite bus in a power
system.
Deduce the general wave equations for a loss less transmission line for propagation of
voltage and current wave.
SECTION C
Attempt any one part of the following: 10 x 1 = 10
One conductor of a 3?phase line is open. The current ?owing to the delta connected
load through line ?a? is 10 A. With the current in the line ?a? as reference and
assuming that line ?c? is open. Find the symmetrical components of the line current.
Explain the sequence impedances. Define balanced star connected load and
transmission lines of sequence impedances.
Attempt any one part of the following: 10 x 1 = 10
Develop ZBus matrix for the network shown in figure.
1 29 2
1666?
1:2 2:2 3 29 gm
0
Derive the relationship to determine the fault current for a single line to ground fault.
Draw an equivalent network showing the interconnection of sequence networks to
stimulate LG fault.
a)
b)
Attempt any one part of the following: 10 x 1 = 10
Explain clearly the computational procedure for load ?ow solution using Newton?
Raphson method when the system contains only PQ buses.
Discuss the fast decoupled load ?ow method in load ?ow study.
Attempt any one part of the following: 10 x 1 = 10
Show that the steady state power which could be transmitted over a transmission line
will be maximum when X = $5 R, where X and R have their usual meaning.
Explain equal?area criterion for the stability of an alternator supplying infinite busbar
Via an inductive interconnector.
Attempt any one part of the following: 10 x 1 = 10
Determine re?ection co-ef?cient and transmission coefficient for receiving end of
transmission line terminated by resistance.
Explain the Bewley?s Lattice diagram Write a note on surge phenomenon De?ne the
protection against overvoltagesl
This post was last modified on 29 January 2020