Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 1st Semester 70725 POWER SYSTEM ANALYSIS AND DESIGN Question Paper.

Roll No. Total No. of Pages : 02

Total No. of Questions : 08

M.Tech.(EE) (2013 Onwards)/(Power System) (2013 & Onwards)

(Sem.?1)

POWER SYSTEM ANALYSIS AND DESIGN

Subject Code : MTEE/MTPS-101

M.Code : 70725

Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.

2. Each question carry TWENTY marks.

Q1. a) What is an Optimal Power Flow problem? Discuss its problem formulation. State the

application of gradient method to obtain OPF solution. (10)

b) Compare the various methods to obtain load flow solution. (10)

Q2. Explain with a five bus system, the Z-bus building algorithm to construct the Z- bus of the

assumed power system network with atleast one pair of mutually coupled lines. (20)

Q3. a) Discuss the application of Thevenin's theorem to solve the network exposed to three

phase symmetrical fault. (10)

b) What are the various buses that exist in a power system network? Discuss the role of

each bus. How is voltage controlled bus different from a PV bus? (10)

Q4. a) A 6.6kV, 10MVA, 3-phase turbo-generator has the following data :

Sub-transient reactance = 0.13pu, transient reactance = 0.25pu, synchronous reactance

= 1. 5pu. A dead short circuit fault involving all the tree phases of the generator occurs

at its terminals. Calculate

(i) the initial symmetrical (rms) short circuit current

(ii) the initial asymmetrical (peak) short circuit current

(iii) the maximum possible dc component of the short circuit current. (5)

b) Three non-reactive resistors 15, 25 and 30 Ohms are connected in star to the terminals

a, b and c of a 440V, 3-phase, 3-wire supply. Find (i) all the line currents (ii) the

voltage between star point and neutral, (iii) Two 1-phase wattmeters with current coils

in lines a and c are connected to measure total power. Calculate the readings of these

wattmeters. Phase sequence is abc. (5)

c) Discuss the modelling of tap-changing transformer and alternator. (10)

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1 | M-70725 (S9)-1461

Roll No. Total No. of Pages : 02

Total No. of Questions : 08

M.Tech.(EE) (2013 Onwards)/(Power System) (2013 & Onwards)

(Sem.?1)

POWER SYSTEM ANALYSIS AND DESIGN

Subject Code : MTEE/MTPS-101

M.Code : 70725

Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.

2. Each question carry TWENTY marks.

Q1. a) What is an Optimal Power Flow problem? Discuss its problem formulation. State the

application of gradient method to obtain OPF solution. (10)

b) Compare the various methods to obtain load flow solution. (10)

Q2. Explain with a five bus system, the Z-bus building algorithm to construct the Z- bus of the

assumed power system network with atleast one pair of mutually coupled lines. (20)

Q3. a) Discuss the application of Thevenin's theorem to solve the network exposed to three

phase symmetrical fault. (10)

b) What are the various buses that exist in a power system network? Discuss the role of

each bus. How is voltage controlled bus different from a PV bus? (10)

Q4. a) A 6.6kV, 10MVA, 3-phase turbo-generator has the following data :

Sub-transient reactance = 0.13pu, transient reactance = 0.25pu, synchronous reactance

= 1. 5pu. A dead short circuit fault involving all the tree phases of the generator occurs

at its terminals. Calculate

(i) the initial symmetrical (rms) short circuit current

(ii) the initial asymmetrical (peak) short circuit current

(iii) the maximum possible dc component of the short circuit current. (5)

b) Three non-reactive resistors 15, 25 and 30 Ohms are connected in star to the terminals

a, b and c of a 440V, 3-phase, 3-wire supply. Find (i) all the line currents (ii) the

voltage between star point and neutral, (iii) Two 1-phase wattmeters with current coils

in lines a and c are connected to measure total power. Calculate the readings of these

wattmeters. Phase sequence is abc. (5)

c) Discuss the modelling of tap-changing transformer and alternator. (10)

2 | M-70725 (S9)-1461

Q5. a) Show the interconnection of sequence networks for a L-L-G fault occurring in a power

system network. Derive the relevant results. (10)

b) A 10MVA, 7kV star connected generator has positive, negative and zero sequence

reactances of 28, 22 and 8% respectively. An inductive reactor with 7% reactance based

on the rating of the generator is placed in the line from neutral to ground. For a L-L

fault at the generator terminals when it is operating at rated voltage and is disconnected

from the system determine, (a) initial symmetrical r.m.s. line and neutral currents and

(b) line to line and line to neutral voltages. (10)

Q6. a) What are symmetrical components? Prove that symmetrical component transformation

is power invariant. (10)

b) Discuss the contingency analysis for power systems using Brown's method. (10)

Q7. What do you understand by state estimation? In what application areas state estimation

concepts are beneficial? How can the bad measurements be measured and identified? Write

the weighted least squares method used for state estimation. (20)

Q8. Write short notes on the following :

a) Modeling of phase-shifting transformer (5)

b) Causes and remedies of bad estimation (5)

c) Fast Decoupled Load flow method (5)

d) Formation of network matrices using singular transformation (5)

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 13 December 2019