Download GTU BE/B.Tech 2019 Summer 5th Sem Old 150902 Power System Analysis And Simulation Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

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Subject Code:150902 Date:17/06/2019
Subject Name:Power System Analysis And Simulation
Time:02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) State and advantages of per unit system. [07]
2. (b) Derive the ABCD constants for nominal —x representation of medium length transmission line. [07]

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1. (a) Explain Sub-Transient, Transient and Steady State reactance of synchronous machine. [07]
2. (b) Write a brief note on selection of circuit breaker. [07]

   OR

   A 50 Hz transmission line 300 km long has a total series impedance of (40 + j 125) ohms and a total shunt admittance of 10^-6 mho. The receiving end load is 50 MW at 220 kV with 0.8 lagging power factor. Find the sending end voltage and current using exact method. [07]

1. (a) Derive the relationship between symmetrical components of line and delta currents. [07]
2. (b) A generator is rated 1000 MVA, 11 KV. Its star connected winding has reactance of 0.9 PU Find (1) Ohmic value of reactance (2) If the generator is working in a circuit for which the base values are specified as 250 MVA, 22 KV, find out its PU reactance on the specified base. [07]

   OR

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1. (a) Derive the equation of the capacitance of a three phase line with equilateral spacing. [07]
2. (b) Explain ‘type 2 modification’ of Zbus building algorithm. [07]

1. (a) Derive an expression for the fault current for a double-line fault as an unloaded generator. [07]
2. (b) A synchronous generator is rated 25 MVA, 11 kV. It is star connected with neutral point solidly grounded. The generator is operating on no-load at rated voltage. Its reactances are X" = X2 = j0.20 pu and X0 = j0.08 pu. Calculate the symmetrical sub transient line current for (1) LG fault (i1) LL fault (ii1)) LLG fault (iv) LLL fault [07]

   OR

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1. (a) Explain the need of neutral grounding of system. Describe any one method of neutral grounding. [07]
2. (b) Discuss corona formation phenomenon. [07]

1. (a) Derive the equation for attenuation of a travelling wave. [07]
2. (b) A 500 kV, 2uS, rectangular surge travels along the line which is terminated by a capacitance of 2500 pF. Determine the voltage across the capacitance and the reflected voltage wave if the surge impedance is 400O. [07]

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1. (a) What is bus impedance matrix? How it is useful in symmetrical fault analysis? [07]
2. (b) Briefly explain the importance of power circle diagrams. Draw and explain the receiving end circle diagram for a transmission line. [07]

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