DEPARTMENT
OF ELECTRICAL AND ELECTRONICS ENGINEERING
6TH SEMESTER - EE 1352 - POWER
SYSTEM ANALYSIS
QUESTION
BANK
UNIT
– 01
2 Marks
01. What is one line
diagram? How the power system components are represented?
02. What are the
components of power system?
03. What is tap
changing transformer? State its types.
04. What is
Off-nominal transformation ratio?
05. Define Per unit value.
06. What is the need
for base values?
07. State the
Advantages of per unit computations.
08. The base kV and
base MVA of a three phase transmission line 33 kV and 10 MVA respectively.
Calculate the
base current and base impedance.
09. State the any
two demerits of per unit computations.
10. What is impedance
and reactance diagram?
11. What are the
approximations made in the reactance diagram?
12. Give the
equations for transforming base kV on LV
side to HV side of transformer and vice-versa.
13. Write the
equation for converting the p.u. impedance expressed in one base to another.
14. A generator rated
at 30 MVA, 11 kV has a reactance of 20%. Calculate its p.u. reactance for a
base
of 50 MVA and
10 kV.
15. What are the step
by step procedure to be followed to find the per unit impedance diagram?
16. What is the need
for system analysis in planning and operation of power systems?
17. How the generator
transient analysis is represented?
18. What is the
purpose of providing third winding (tertiary) in a Transformer?
Note : Apart from the above theory questions small types of
Problems may be asked (if necessary).
(i) Existing p.u. will be given and you are asked
to find out the new p.u.
(ii) Values in ohm will be given you are asked to
find out new values in p.u
Long Answered
Questions 16 Marks.
1.(i) Derive the
equations to find out the Π equivalent circuit transformer with off nominal tap
ratio. (8)
(ii) Discuss about the per phase analysis of
symmetrical three phase system. (8)
2. Explain the
Modern Power system in detail.
(16)
3. Explain the
per phase analysis of Equivalent network of Uniform long lines ( T model ) (16)
Note : Apart from the above theory questions Full Problems
will be asked (compulsorily).
(i) One sample power system network with values
in either ohm (or) in p.u. will be given and you
are
asked to draw the reactance diagram also you have to mark the new values which
has to be
find
out using simple formulas.
UNIT
– 02
2 Marks
01. What is Load
flow study?
02. What is the need
for load flow study?
03. Why power flow
analysis is made?
04. What are the
informations that are obtained from a load flow study?
05. How a load flow
study is performed?
06. What are the
different types of buses in a power system?
07. What is swing
bus?
08. Define Voltage
controlled bus.
09. What is Load
bus?
10. List the quantities specified and quantities
to be determined from the load flow study for the various
types of
buses.
11. What is the need
for slack bus?
12. Write the load
flow equations for Gauss-Seidel and Newton-Raphson method.
13. Discuss the effect of acceleration factor in
the load flow solution algorithm and how will you account
for voltage
controlled bus in the algorithm.
14. When the
Generator bus is treated as load bus? What will be the reactive power and bus
voltage?
15. What are the advantages
of Gauss-Seidel method?
16. What are the
disadvantages of Gauss-Seidel method?
17. What is Jacobian
matrix? How the elements of Jacobian matrix
are computed?
18. What are the
advantages of Newton-Raphson method?
19. What are the
disadvantages of Newton-Raphson method?
20. Compare G-S
method and N-R method of power flow solutions.
21. How the
disadvantages of N-R method are overcome?
22. How the
convergence of N-R method is speedup?
23. What is an
acceleration factor?
24. What are the
advantages and disadvantages of FDPF over N-R method?
25. How the reactive
power of a Generator is controlled?
Long
Answered Questions 16 Marks.
1. With the help of
the neat flow chart, explain the (a)
or (b) or (c) of
load flow solution when the
system contains
voltage controlled buses in addition to the swing bus and load bus. Each
(a) Newton – Raphson method (b)
Gauss – Seidel method (c) Fast decoupled power flow (16)
2.(i) Derive the
static load flow equations of n bus
systems.
(11)
(ii) Explain the p-v adjustment in N-R
method.
(5)
3.(i) Explain why
power flow studies are essential and
vital parts of power system studies (6)
(ii) Discuss about
the fast decoupled power flow method. (10)
Note : Apart from the above theory questions Full Problems
will be asked (compulsorily).
Problem may be asked in the above mentioned
three types of load flow solution technique.
(i) Gauss – Seidel method -
Max. four bus problem shall be asked
(ii) Newton
– Raphson method - Max. three bus bus problem shall be asked.
(iii) Fast decoupled power flow - Max.
four bus problem shall be asked.
UNIT
– 03 2 Marks
01. What is meant by
a fault in power system?
02. How faults are
classified? List the various types of shunt and series faults.
03. What is
symmetrical and unsymmetrical faults.
04. For a fault at a
given location, rank the various faults in the order of severity.
05. Write the
relative frequency of occurrence of various types of fault.
06. How symmetrical
and unsymmetrical faults are analysed?
07. What is the need
for short circuit study (or) fault analysis?
08. What is meant by
doubling effect?
09. What is
synchronous reactance?
10. Define sub
transient reactance?
11. Define transient
reactance?
12. What is bus
admittance matrix? Write its equation.
13. What are the
advantages of bus admittance matrix?
14. What is bus
impedance matrix?
15. What are the
methods available for forming bus impedance matrix?
16. Write the four
ways of adding impedance to an existing system so as to modify bus impedance
matrix.
17. What are the
methods used for reducing short circuit current.
18. What are the
assumptions made in short circuit studies of large power system network.
19. Define short
circuit interrupting MVA of a circuit breaker.
20. How circuit
breakers can be selected?
21. Define infinite
bus in a power system.
22. A three phase 20
MVA, 11 kV generator has 5% sub-transient reactance . A three phase short
circuit
occurs at its
terminals find fault current in MVA.
Long
Answered Questions 16 Marks.
1. Explain the
procedure for making short circuit studies of a large power system networks
using digital
computers.
(16)
2. Explain the step
by step procedure for Z bus building algorithm and explain its different types
in detail
Note : Apart from the above theory questions Full Problems
will be asked (compulsorily).
Problem may
be asked in the following method.
(i) Sample power system will be given with fault
in the network. Students are required to solve the
problem using (i) Kirchoff’s law
(ii) Thevenin’s method.
(ii) Using sample network form the matrix ( Z bus building algorithm
)
UNIT
– 04
2 Marks
1. Define negative
sequence impedance.
2. Define Positive
sequence impedance.
3. What are
symmetrical components? Write the symmetrical components.
4. What are positive
sequence components?
5. What are negative
sequence components?
6. What are zero
sequence components?
7. Prove that 1+a+a
square = 0
UNIT
– 05 2 Marks
1. Define Stability. What is stability study?
2. Define steady state stability.
3. Define dynamic stability. State its purpose.
3. Define transient stability.
4. What is transient stability limit?
5. What is transient instability?
6. When the transient stability studies are
conducted and what is the need of transient stability study?
7. Define Power angle.
8. What is swing equation.
9. What are the assumptions made by solving swing
equation?
10. Define swing
curve. What is the use of swing curve?
11. What is first
swing and multi swing?
12. What is damper
winding?
13. Define : Critical clearing angle and time.
14. Give the
expression for critical clearing angle and time.
15. List the methods
of improving the transient stability
limit of a power system.
16. State Equal area
Criterion.
17. State the
application of Equal area criterion.
18. What is voltage
Instability?
19. What is meant by
Infinite bus?
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