Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2180903 Power System Planning And Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180903 Date: 27/11/2019
Subject Name: Power System Planning and Design
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 the factors to be considered in the selection of a voltage suitable for
transmitting a certain amount of power over a given distance.
03
(b) What is the effect of stranded conductors and bundled conductors on
corona?
04
(c) Write all steps required to design a transmission line. 07
Q.2 (a) What are the factors which affects the type of distribution system chosen
under different conditions in the area?
03
(b) A three-phase four wire 400/230 V distribution system is loaded as below.
a) A 3-phase induction motor load of 250 kW at 0.8 power factor lagging
b) Single-phase resistance load of 200 kW between R and N
c) Single-phase resistance load of 150 kW between Y and N
d) Lightning load of 150 kW between B and N.
Find (1) line currents, (2) power factor of the distribution system loads and
(3) current in the neutral. Represent the result with help of phasor diagram.
04
(c) Discuss the steps for planning and designing of electrical distribution
schemes.
07
OR
(c) Explain the methods of designing primary-distribution system with
reference to
(a) choice of voltage
(b) conductor size
(c) type of distribution and
(d) Voltage drops.
07
Q.3 (a) Explain briefly the main consideration in planning and designing
generating stations in power systems with reference to choice of generator
unit constants.
03
(b) Briefly explain considerations in the location of substations. 04
(c) What are the causes of high losses and poor voltage regulation in a power
system? What are the points to be considered in system improvement to
bring it to normal operation with voltage regulation within limits and better
efficiency?
07
OR
Q.3 (a) State the advantages of interconnecting large power systems and use of
interconnections in the system.
03
(b) What are the points to be considered in system improvement to bring high
losses and poor voltage regulation to its normal values?
04
(c) What are the financial considerations to make the system improvement
scheme viable? Explain with an illustration.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180903 Date: 27/11/2019
Subject Name: Power System Planning and Design
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 the factors to be considered in the selection of a voltage suitable for
transmitting a certain amount of power over a given distance.
03
(b) What is the effect of stranded conductors and bundled conductors on
corona?
04
(c) Write all steps required to design a transmission line. 07
Q.2 (a) What are the factors which affects the type of distribution system chosen
under different conditions in the area?
03
(b) A three-phase four wire 400/230 V distribution system is loaded as below.
a) A 3-phase induction motor load of 250 kW at 0.8 power factor lagging
b) Single-phase resistance load of 200 kW between R and N
c) Single-phase resistance load of 150 kW between Y and N
d) Lightning load of 150 kW between B and N.
Find (1) line currents, (2) power factor of the distribution system loads and
(3) current in the neutral. Represent the result with help of phasor diagram.
04
(c) Discuss the steps for planning and designing of electrical distribution
schemes.
07
OR
(c) Explain the methods of designing primary-distribution system with
reference to
(a) choice of voltage
(b) conductor size
(c) type of distribution and
(d) Voltage drops.
07
Q.3 (a) Explain briefly the main consideration in planning and designing
generating stations in power systems with reference to choice of generator
unit constants.
03
(b) Briefly explain considerations in the location of substations. 04
(c) What are the causes of high losses and poor voltage regulation in a power
system? What are the points to be considered in system improvement to
bring it to normal operation with voltage regulation within limits and better
efficiency?
07
OR
Q.3 (a) State the advantages of interconnecting large power systems and use of
interconnections in the system.
03
(b) What are the points to be considered in system improvement to bring high
losses and poor voltage regulation to its normal values?
04
(c) What are the financial considerations to make the system improvement
scheme viable? Explain with an illustration.
07
2
Q.4 (a) Give objective and definitions of power system earthing. 03
(b) What is B.I.L.? How lightning arrestor selection is done with proper
insulation coordination?
04
(c) Explain station earthing system with earthing grid. 07
OR
Q.4 (a) What is insulation coordination? 03
(b) Explain briefly step potential and touch potential? 04
(c) Write short note on Power system over voltages. 07
Q.5 (a) List out methods used for power system improvement. 03
(b) Explain briefly why load and energy forecasting is necessary in power
system planning?
04
(c) Explain how voltage regulation and losses in a power system is
determined?
07
OR
Q.5 (a) Which methods are adopted for power system planning? 03
(b) Write short note: Shifting of distribution transformer center. 04
(c) Explain any one method used for measurement of power system reliability. 07
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This post was last modified on 20 February 2020