GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
--- Content provided by FirstRanker.com ---
Subject Code: 2180903 Date: 27/11/2019Subject Name: Power System Planning and Design
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
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
--- Content provided by FirstRanker.com ---
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. 04
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
--- Content provided by FirstRanker.com ---
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.
(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 07
--- Content provided by FirstRanker.com ---
(a) choice of voltage(b) conductor size
(c) type of distribution and
(d) Voltage drops.
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
--- Content provided by FirstRanker.com ---
(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
--- Content provided by FirstRanker.com ---
(c) What are the financial considerations to make the system improvement scheme viable? Explain with an illustration. 07 Q.4 (a) What is B.ILL.? How lightning arrestor selection is done with proper insulation coordination? 04
(c) Explain station earthing system with earthing grid. 07
OR
--- Content provided by FirstRanker.com ---
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
--- Content provided by FirstRanker.com ---
(c) Explain how voltage regulation and losses in a power system is determined? 07OR
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
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---