A E192011 Pages:3

Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

Course Code: EE301
Course Name: POWER GENERATION, TRANSMISSION AND PROTECTION

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries5 marks. Marks
1 What is Load curve. Explain the significance of Load curve. (5)
2 Derive an expression for the capacitance of a single phase transmission line. (5)
3 Each line of a 3-phase system is suspended by a string of three similar (5)

insulators. If the voltage across the line unit is 17.5kV. Calculate the line to
neutral voltage. Assume that the shunt capacitance between each insulator and
earth is 1/8" of the capacitance of the insulator itself. Also calculate the string
efficiency.

4 Explain TCR configuration (5)
A circuit breaker interrupts the magnetising current of LOOMVA transformer at (5)
220kV.The magnetising current of the transformer is 5% of the full load current.
Determine the maximum voltage which may appear across the gap of the breaker
when the magnetising current is interrupted at 53% of its peak value. The stray
capacitance is 2500uF.The inductance is 30H.

6 With the help of a block diagram explain the working of a microprocessor based (5)
over current relay.

7 With help of a neat diagram explain the working of a Buchholz relay. (5)

8 Distinguish between radial and ring main distribution systems. Enlist their (5)
advantages and disadvantages.

PART 13
Answer any twofull questions, each carries 10 marks.
9 a) Witha neat figure explain the working of Hydro electric power plant. (6 )
b) A power station has a maximum demand of 15000kW.The annual load factor is (4)

50% and capacity factor is 40%. Determine the reserve capacity of the plant.

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