Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech EEE (Electrical And Electronics Engineering) 2020 March 7th and 8th Sem Computer Aided Power System Analysis Previous Question Paper
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech. (EE/EEE) (Sem.?7,8)
COMPUTER AIDED POWER SYSTEM ANALYSIS
Subject Code : EE-402
M.Code : 57055
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define per unit value of any electrical quantity.
b) What are the different steps to be followed for drawing a impedance diagram from a
given single line diagram of power system?
c) Draw power angle curve of a synchronous generator.
d) What is difference between constant power and constant impedance representation of
loads in power systems?
e) Why PQ bus is also known as load bus in load-flow studies?
f) Why acceleration factor is used in Gauss-Siedel methods of load-flow?
g) Why open conductor faults are known as series faults?
h) Determine the symmetrical components of three voltages V
a
= 200 ?L0?,
V
b
= 200 ? 245?, and V
c
= 200 ? 105?
i) Define steady state operating condition.
j) With reference to power system stability, discuss swing equation.
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1 | M-57055 (S2)-2753
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech. (EE/EEE) (Sem.?7,8)
COMPUTER AIDED POWER SYSTEM ANALYSIS
Subject Code : EE-402
M.Code : 57055
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define per unit value of any electrical quantity.
b) What are the different steps to be followed for drawing a impedance diagram from a
given single line diagram of power system?
c) Draw power angle curve of a synchronous generator.
d) What is difference between constant power and constant impedance representation of
loads in power systems?
e) Why PQ bus is also known as load bus in load-flow studies?
f) Why acceleration factor is used in Gauss-Siedel methods of load-flow?
g) Why open conductor faults are known as series faults?
h) Determine the symmetrical components of three voltages V
a
= 200 ?L0?,
V
b
= 200 ? 245?, and V
c
= 200 ? 105?
i) Define steady state operating condition.
j) With reference to power system stability, discuss swing equation.
2 | M-57055 (S2)-2753
SECTION-B
2. Single line representation of a simple power system is shown in figure 1. Obtain the per
unit impedance diagram of power system shown in Figure 1. Specifications are given in
Table 1. Transmission line is having reactance of 20.5 ?/phase.
FIG.1
Figure 1: Single line representation of power system
Table 1: Specifications of power system given in Figure 1
Generator No. MVA rating Line to line voltage
(kV)
Per phase
reactance in ?
1 30 10.5 1.6
2 15 6.6 1.2
3 25 6.6 0.56
Transformer No. MVA rating Line to line voltage
transformation in kV
Per phase
impedance in ?
1 15 33/11 15.2 (HT side)
2 15 33/6.2 16 (HT side)
Type of LOAD MW Line to line voltage
in kV
Power factor
A 40 11 0.9 lagging
B 40 6.6 0.85 lagging
3. Write a note on system modelling of transformers.
4. Line data of a four bus system is given in Table 2.
Table 2 : Line Data of Four Bus System
Line, bus to bus R in pu X in pu
1-2 0.05 0.15
1-3 0.10 0.30
2-3 0.15 0.45
2-4 0.10 0.30
2-5 0.05 0.15
Y 1
A
2 Y
3 Y
B
Y Y Y ?
T
1
T
2
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1 | M-57055 (S2)-2753
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech. (EE/EEE) (Sem.?7,8)
COMPUTER AIDED POWER SYSTEM ANALYSIS
Subject Code : EE-402
M.Code : 57055
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define per unit value of any electrical quantity.
b) What are the different steps to be followed for drawing a impedance diagram from a
given single line diagram of power system?
c) Draw power angle curve of a synchronous generator.
d) What is difference between constant power and constant impedance representation of
loads in power systems?
e) Why PQ bus is also known as load bus in load-flow studies?
f) Why acceleration factor is used in Gauss-Siedel methods of load-flow?
g) Why open conductor faults are known as series faults?
h) Determine the symmetrical components of three voltages V
a
= 200 ?L0?,
V
b
= 200 ? 245?, and V
c
= 200 ? 105?
i) Define steady state operating condition.
j) With reference to power system stability, discuss swing equation.
2 | M-57055 (S2)-2753
SECTION-B
2. Single line representation of a simple power system is shown in figure 1. Obtain the per
unit impedance diagram of power system shown in Figure 1. Specifications are given in
Table 1. Transmission line is having reactance of 20.5 ?/phase.
FIG.1
Figure 1: Single line representation of power system
Table 1: Specifications of power system given in Figure 1
Generator No. MVA rating Line to line voltage
(kV)
Per phase
reactance in ?
1 30 10.5 1.6
2 15 6.6 1.2
3 25 6.6 0.56
Transformer No. MVA rating Line to line voltage
transformation in kV
Per phase
impedance in ?
1 15 33/11 15.2 (HT side)
2 15 33/6.2 16 (HT side)
Type of LOAD MW Line to line voltage
in kV
Power factor
A 40 11 0.9 lagging
B 40 6.6 0.85 lagging
3. Write a note on system modelling of transformers.
4. Line data of a four bus system is given in Table 2.
Table 2 : Line Data of Four Bus System
Line, bus to bus R in pu X in pu
1-2 0.05 0.15
1-3 0.10 0.30
2-3 0.15 0.45
2-4 0.10 0.30
2-5 0.05 0.15
Y 1
A
2 Y
3 Y
B
Y Y Y ?
T
1
T
2
3 | M-57055 (S2)-2753
Generators are connected at all the buses, while loads are connected at only buses 2 and 3
Assume a flat voltage profile and find the voltages and bus angles at the three buses at the
end of first Gauss-Seidel iteration. Input data is given in Table 3.
Table 3: Input data Of Four Bus System
Bus Active power
(pu)
Reactive power
(pu)
Voltage (pu) Type of bus
1 - - 1.04 ? 0? Slack
2 0.5 -0.2 - PQ
3 -1.0 0.5 - PQ
4 0.3 -0.1 - PQ
5. With the help of mathematical equations, write detailed algorithm to solve load-flow of
power system using Newton-Raphson method.
6. Write a note on the formation of impedance matrices for the power systems.
SECTION-C
7. a) Why there is phase shift in star-delta transformers? Support your answer with phasor
diagrams.
b) Draw equivalent circuit diagram of power system showing line to line fault through
fault impedance. With the help of boundary conditions, derive mathematical
equations using symmetrical components and draw connection of positive, negative
and zero sequence networks.
8. Write a note on :
a) Transients on transmission line
b) Factors affecting transient stability.
9. Write a note on equal area criterion for two machine system.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020