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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: EE301
Course Name: POWER GENERATION, TRANSMISSION AND PROTECTION(EE)

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries5 marks.
1 Write using figures and equations how the power factor is improved using (5)

capacitors in power system.

2 2) A 3 phase 80km long Transmission line has its conductors of lcm diameter (3)
spaced at the corners of the equilateral triangle of 100cm side. Find the
inductance per phase of the system.

b) Define Ferranti effect. (2)

3 Derive the equation for Sag in transmission lines, when the support is at equal (5)
and unequal heights.

4 Explain different types of DC links. (5)

5 Define the terms Restriking voltage, Recovery voltage, Zones of protection, (5)
properties of SF gas

6 Draw the block diagram of microprocessor based over current relay. (5)

7 Explain Insulation Coordination. (5)

8 Explain Buchholz Relay and write its importance in Transformer protection. (5)

PART B
Answer any twofull questions, each carries10 marks.
9 a) Explain Hydro Electric power plants using a neat sketch. (6)
b) Explain the term Load factor, Load curve and write its features. (4)

10 a) What do you mean by Voltage Regulation and Efficiency of power transmission. (3)
b) Derive the ABCD Constants for medium length lines using nominal 7 method (7)
draw its phasor diagram.
11 a) Derive the L-L Capacitance of a two wire line. (4)
b) A 3phase, 50 Hz, 132 kV OH Line has conductors placed in a horizontal plane (6)
4m apart. Conductor diameter is 2 cm. If the line length is 100km calculate the
charging currents per phase assuming complete transposition.
PART C
Answer any twofull questions, each carries10 marks.
12 a) Find the optimum transmission voltage in power system for transmission and (4)
write its empirical formulae.
b) Explain corona and derive the equation for disruptive critical voltage and visual (6)
critical voltage.

13 a) Explain with figures the configuration of TCSC. (4)
b) Explain Intersheath grading of cables using figures. (6)
14 a) Explain different types of insulators used for transmission and distribution. (3)
b) State the methods of improving string efficiency. (3)

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