52132-mt----electrical Distribution Systems

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Code No: 52132/MT M.Tech. – I Semester Supplementary Examinations, September, 2008 ELECTRICAL DISTRIBUTION SYSTEMS (Power Systems (High Voltage) ) Time: 3hours

Max. Marks:60 Answer any FIVE questions All questions carry equal marks ---

1.

Explain the presort trend for distribution system planning in detail.

2.a)

Discuss how the load growth in distribution system can be obtained. A distribution substation has an arrival peak load of 3500 kw. The total arrival energy supplied to the primary feeder circuits is 106 kwh. Find i) Arrival average power ii) arrival load factor

b)

3.

Give a detailed analysis of square shaped and hexagonal shaped distribution substation areas.

4.

Derive `K’ constant from fundamentals for voltage drop calculation.

5.

Consider the three phase three wire 240V secondary system shown in figure.

Contd….2.,

Code No: 52132/MT

::2::

a) Calculate the total voltage drop b) Calculate the real power per phase for each load c) Calculate the reactive power per phase for each load. 6.

Discuss the different over current protective devices applied to distribution system.

7.

Derive an equation for optimum location of a capacitor bank.

8.

Explain the following for voltage control i) Series capacitors ii) Automatic voltage regulator.

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