Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2014-2015 Power System Analysis Question Paper
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(Following Paper ID and Roll No. to be ?lled in your Answer Book)
PAPER ID : 121602 ,
Roll No.
B. Tech.
(SEM. VI) THEORY EXAMINATION, 2014-15
POWER SYSTEM ANALYSIS
Tune : 3 Hours] [Total Marks : 100'
All Questions are Compulsory
1 Attempt any four parts of the following: (4XS=20)
(A) What do you understand by Single line diagram and
reactance diagram of a power system? Explain per unit
system and its advantage.
(B) A 500 MVA, 20 kV, 3 (1) generator has sub transient
reactance of 10%. The generator supplies 2 synchronous
motors through a transmission line having transfonners
at both ends as shown in ?g. In this, T1 is a 3(1)
transformer 250 MVA, 20/230 kV, 15% reactance &
T2 is made of 3 single phase transformer of rating 500
'MVA, 13.2/ 127 kV, 20% reactance. Series reactance
of the transmission line is 10052. The ratings of 2
motors are: M1=150 MVA, 13.2 kV, 15% & M2=200
MVA, 13.2 kV, 20%. Draw the reactance diagram with
all the reactance's marked in p.u. Select the generator
rating as base values (?g. on next page.)
121602] 1 [ Contd...
(C)
(D)
(F)
(A)
121602]
Attempt any two parts of the following:
' n:na- - -:??O
A Y A "'
Whatarecmentlimitingreaetom?Diswsstheirlocatimal
aspects and advantages. *
The line to ground voltage on the high voltage side of
a transformer are Va 100kv, Vb = 30 kv and Vc =
38kv on phase a,b,c .voltage of phase a leads phase
b by 100? anti lags that of phase c by 176.5? ,determine
the symmetn'eal components of Va
A single phase load of 100 KVA connected across line
b-c of three phase 3. 3 kv .Determine the symmetn'cal
component of current.
b
c -?1::1?J
Explain the symmetrical component and why it is used
in power system.
10X2=20
Show that zero sequence impedance of a generator with
neutral grounded a impedance Zn is (Zs + 3Zn) , where
Z3 is the impedance of synchronous generator. An 11
kv, 25 MVA generator have positive ,nega?ve and zero
sequence impedance of 0.12, 0 l2 and 0.08 per unit
resp. The generator is grounded through a impedance
f 0 03 per unit. Determine the fault current of a single
line to ground fault occurs at generator terminal. Also
calculate line to line fault voltage. Assume generator was
unloaded before fault.
2 [ Contd...
(B)
(C)
3
(A)
(B)
(C)
121602]
Attempt any two parts of the following:
Derive and explain the algorithm of Zbus formation by
singular transform method .
Detaminethe?mlt mentincaseoflrermiltwhen
fault occurs at point shown in ?gure. Both the generator
are generating power at 1.0 p.u. voltage. rcactance on
same base are given in the table.
Lint
7; 7'?
63*? 45?69
)1 X/n ' L_?li?lm ___,.4 Km
3?0 x1 x2
G1 0.05 0.30 0.26?
02 0.03 0.25 0.15
Linel 0.70 0.30 0.30
Linez 0.70 0.30 0.30
T1 0.12 0.12 0.12
T, 0.10 0.10 0.10
(10*2=20)
Explain the computational procedure for load ?ow
solution using Newton Raphson iterative method when
the system contains all types of buses.
Discuss the load ?ow equations and also formulate the
equations using Gauss seidal method.
What is the pwpose of Load ?ow study? Also classify
the buses for the same and compare the different load
?ow techniques.
3 [ Contd...
4 Attempt any two parts of the following: 10X2=20
(A)
(B)
(C)
Discuss point by point method for solving swing
equation for transient stability analysis of power system.
Also explain the method of improving transient stability.
A 150 MVA generator ?transformer unit having an
overall reactance of 0.3 p.u. is delivering 150 MW to
in?nite bus bar over a double circuit 220 kV line having
reactance per phase per circuit of 100 ohms. A 3 phase
fault occurs midway along one of the transmission lines.
Calculate the maximum angle of swing that the generator
may achieve the fault is cleared without loss of stability.
For the system shown in ?gure the mnnen'cal values of
different components are X'd= 0.2 p..u and X1=X2=
0:4 p.u. Initially the generator was delivering the power
of 1.5 p.u. If one of the double circuit lines is tripped
o??, detennine whether the system will remain stable or
not. If stability is maintained, determine the maximum
angle of swing attained by generator.
5 Attempt any two parts of the following: 10X2=20
(A) Starting from the ?rst principles show that the surge
, behaves es travelling wave.
(B) Discuss the behaviour of travelling waves when it
reaches (i) Open circuited (ii) Short circuited transmission
line and (iii) when line is terminating with a impedance
equal to surge impedance (20).
(C) Discuss the re?ection and re?ection of travelling wave
drawing the Bewely's lattice diagram. Take a suitable
example of explanation.
121602] 4 [ 8900 ]
This post was last modified on 29 January 2020