Download PTU M.Tech. EE 1st Semester 75731 POWER SYSTEM ANALYSIS Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 1st Semester 75731 POWER SYSTEM ANALYSIS Question Paper.

1 | M-75731 (S35)-585

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (Electrical Power System) (2018 Batch) (Sem.?1)
POWER SYSTEM ANALYSIS
Subject Code : EEPS-101-18
M.Code : 75731
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1 Explain the computational procedure for load-flow solution using Newton-Raphson
method when all types of buses are available in the system.
2. The resistive network shown in the figure is supplying a load 0.5 pu over a line with
resistance of 0.4 pu. Bus 1 is assumed to be slack bus, having a voltage of 1.0 pu.

FIG.1
Using the Newton-Raphson method, calculate: (minimum 2 iterations)
a) Voltage at load bus 2
b) Current in line 1-2
c) The slack bus power
d) Power loss in the line
3. a) Discuss the mechanism of voltage collapse in a power transmission system.
b) A 50 Hz turbo-generator is rated 500 MVA, 22kV. It is Y-connected, solidly
grounded and is operating at rated voltage at no load. It is disconnected from the rest
of the system. Its reactances are, X
d
"
= X
1
= X
2
= X
0
= 0.05pu.
Find the ratio of the subtransient line current for a L-L fault to the subtransient
current for a symmetrical three phase fault on the generator.
1
2
R = 0.4 pu
V = 1.0 pu
1
P = 0.5 pu
2
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1 | M-75731 (S35)-585

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (Electrical Power System) (2018 Batch) (Sem.?1)
POWER SYSTEM ANALYSIS
Subject Code : EEPS-101-18
M.Code : 75731
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1 Explain the computational procedure for load-flow solution using Newton-Raphson
method when all types of buses are available in the system.
2. The resistive network shown in the figure is supplying a load 0.5 pu over a line with
resistance of 0.4 pu. Bus 1 is assumed to be slack bus, having a voltage of 1.0 pu.

FIG.1
Using the Newton-Raphson method, calculate: (minimum 2 iterations)
a) Voltage at load bus 2
b) Current in line 1-2
c) The slack bus power
d) Power loss in the line
3. a) Discuss the mechanism of voltage collapse in a power transmission system.
b) A 50 Hz turbo-generator is rated 500 MVA, 22kV. It is Y-connected, solidly
grounded and is operating at rated voltage at no load. It is disconnected from the rest
of the system. Its reactances are, X
d
"
= X
1
= X
2
= X
0
= 0.05pu.
Find the ratio of the subtransient line current for a L-L fault to the subtransient
current for a symmetrical three phase fault on the generator.
1
2
R = 0.4 pu
V = 1.0 pu
1
P = 0.5 pu
2
2 | M-75731 (S35)-585

4. What are the power modelling techniques followed for the Contingency Analysis and
which power system model is preferred the most and why?
5. What is the significance of the network sensitivity factors for determining and for quick
calculation of possible overloads in a power network? Briefly explain the above using the
Generation shift factors and Line outage Distribution factors. No derivations are required.
6. a) What are effective counter measures undertaken to prevent or contain Voltage
instability?
b) What effective methods are employed for improving the voltage stability?
7. How the PV characteristics with constant load power factor affect the voltage that
follows the stability of the power system? Explain in detail using PV curves for various
power factors.
8. ?The ability to detect and identify bad measurements is significantly important to a load
dispatch centre?. How is the ?Bad Data? Identified so that it could be removed from the
vector of measurements before it is processed for a better and reliable State Estimation?










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