Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem Old 150902 Power System Analysis And Simulation Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) State and advantages of per unit system. 07
(b) Derive the ABCD constants for nominal ?? representation of medium length
transmission line.
07
Q.2 (a) Explain Sub-Transient, Transient and Steady State reactance of synchronous
machine.
07
(b) Write a brief note on selection of circuit breaker. 07
OR
(b) 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
-3
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
Q.3 (a) Derive the relationship between symmetrical components of line and delta
currents.
07
(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
Q.3 (a) Derive the equation of the capacitance of a three phase line with equilateral
spacing.
07
(b) Explain ?type 2 modification? of Zbus building algorithm. 07
Q.4 (a) Derive an expression for the fault current for a double-line fault as an unloaded
generator.
07
(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 (i) LG fault (ii) LL fault (iii) LLG
fault (iv) LLL fault
07
OR
Q.4 (a) Explain the need of neutral grounding of system. Describe any one method of
neutral grounding.
07
(b) Discuss corona formation phenomenon. 07
Q.5 (a) Derive the equation for attenuation of a travelling wave. 07
(b) A 500 kV, 2?S, 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 400?.
07
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) State and advantages of per unit system. 07
(b) Derive the ABCD constants for nominal ?? representation of medium length
transmission line.
07
Q.2 (a) Explain Sub-Transient, Transient and Steady State reactance of synchronous
machine.
07
(b) Write a brief note on selection of circuit breaker. 07
OR
(b) 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
-3
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
Q.3 (a) Derive the relationship between symmetrical components of line and delta
currents.
07
(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
Q.3 (a) Derive the equation of the capacitance of a three phase line with equilateral
spacing.
07
(b) Explain ?type 2 modification? of Zbus building algorithm. 07
Q.4 (a) Derive an expression for the fault current for a double-line fault as an unloaded
generator.
07
(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 (i) LG fault (ii) LL fault (iii) LLG
fault (iv) LLL fault
07
OR
Q.4 (a) Explain the need of neutral grounding of system. Describe any one method of
neutral grounding.
07
(b) Discuss corona formation phenomenon. 07
Q.5 (a) Derive the equation for attenuation of a travelling wave. 07
(b) A 500 kV, 2?S, 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 400?.
07
2
OR
Q.5 (a) What is bus impedance matrix? How it is useful in symmetrical fault analysis? 07
(b) Briefly explain the importance of power circle diagrams. Draw and explain the
receiving end circle diagram for a transmission line.
07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020