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Power System Analysis 6th AM11 EE2351

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B.E. / B.Tech. Degree Examination, April / May 2011
Sixth Semester
Electrical and Electronics Engineering
EE 2351 – Power System Analysis
(Regulation 2008)

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Part A – (10 × 2 = 20 marks)

1. Draw a simple per-phase model for a cylindrical rotor synchronous machine?
2. What are the advantages of per unit system?
3. What is Jacobian matrix?
4. What is a slack bus?
5. Mention the objectives of short circuit analysis.
6. Write down the balanced and unbalanced faults occurring in a power system.
7. What is sequence network?
8. Write the symmetrical components of a three phase system?
9. Define critical clearing angle.
10. Write swing equation.

Part B – (5 × 16 = 80 marks)

11. (a) (i) With the help of single line diagram, explain the basic components of a power system. (8)
(ii) Write detailed notes about the per-phase model of a three phase transformer. (8)
(b) Draw the impedance diagram for the electric power system shown in given figure showing all impedance in per unit on a 100 MVA base.
Choose 20 KV as the voltage base for generator. The tree-phase power and line-lie ratings are given below. (16)
Generator G1: 90 MVA 20 KV X = 9 %
Transformer T1: 80 MVA 20 / 200 KV X = 16 %
Transformer T2: 80 MVA 200 / 20 KV X = 20 %
Generator G2: 90 MVA 18 KV X = 9 %
Line: 200 KV X = 120
Load: 200 KV, S = 48 MW + j64 MVAr

12 (a) With neat flow chart explain the computational procedure for load flow solution using fast decoupled method when the system contains all types of buses.
(b) Explain the step by step computational procedure for Gauss-Seidel method of load flow studies.

13 (a) Explain symmetrical fault analysis using Zbus matrix with eat flow chart.
(b) A 11 KV, 100 MVA alternator having a sub-transient reactance of 0.25 p.u is supplying a 50 MVA motor having a sub-transient reactance of 0.2 p.u through a transmission line. The line reactance is 0.05 p.u on a base of 100 MVA. The motor is drawing 40 MW at 0.8 p.f leading with a terminal voltage of 10.95 KV when a 3-phase fault occurs at the generator terminals. Calculate the total current in generator and motor under fault condition.

14. (a) What are the assumptions to be made in short circuit studies? Deduces and thaw the sequence network for a line fault at the terminal of an unloaded generator.
(b) Two 11 KV, 20 MVA, three phase, star connected generator operate in parallel as shown in given figure the positive, negative and zero sequence reactances of each being, respectively, j0.18, j0.15, j0.10 p.u. The star point of one of the generators is isolated and that of the other is earthed through a 2.0 O resistor. A single line to ground fault occurs at the terminals of one of the generators.
Estimate (i) The fault current
(ii) Current in grounding resistor, and
(iii) The voltage across grounding resistor.

15. (a) Describe the Runge-Kutta method of solution of swing equation for multi-machine systems.
(b) Derive an expression for the critical clearing angle and clearing time.

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