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Posted Date: 04 May 2009 Posted By: ravikanth Member Level: Diamond
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2007 Jawaharlal Nehru Technological University Electrical and Electronics Engineering IV B.Tech.(I-Semester) Examinations ELECTRICAL DISTRIBUTION SYSTEMS Question paper
Code No.OR847593
IV B.Tech.(I-Semester) Examinations August 2007
ELECTRICAL DISTRIBUTION SYSTEMS(Electrical and Electronics Engineering)
Time: 3 hours Max.Marks:80
Answer any FIVE questions
All questions carry equal Marks
1.a) Define the following terms and explain them with examples. (i) Demand factor (ii) Plant factor (iii) Coincidence factor.
b) The generating station supplies the following loads: 15 MW, 12 MW, 8.5 MW, 6 MW and 0.45 MW. The station has a maximum demand of 22 MW. The annual load factor of the station is 48%. Calculate (i) the number of units supplied annually. (ii) the diversity factor (iii) the demand factor.
2. Explain the voltage levels and feeder loading of primary feeders.
3. Explain the manual methods of solution for radial networks.
4. What do you mean by coordination of protective devices and write the general procedure to achieve coordination of protective devices in the distribution systems.
5.a) Explain briefly the different methods for power factor control in the distribution systems.
b) A single phase 400V, 50 Hzs motor takes a supply current of 50A at a power factor of 0.6 lagging. The motor power factor has been improved to 0.9 lagging by connecting a condenser in parallel. Calculate the capacity of the condenser required.
6.a) How do you compensate line drop in the distribution system? Explain with neat diagrams.
b) Describe the effect of AVE in controlling the voltage in distribution system.
7.a) How do you select the best location for the substation? Explain.
b) For purpose of planning electrification of certain area, it can be assumed that the area can be divided into four zones A, B, C and D which are approximately located at the four corners of a rectangle having 15 Km long and 6.5 Km wide. The total loads for these zones are as follows: A-8.1 MW B-18.2 MW; C-7.8 MW and D-1.4 MW. It is proposed to locate a high voltage sub-station operating at 132 KV. Determine a suitable location for this sub-station.
8. Write short notes on any two of the following: a) primary and secondary distribution systems. b) power loss calculations in distribution systems. c) Coordination of protective devices.
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