Code No. 410253 IV/IV B.Tech. I-Semester Examination November, 2002. POWER SYSTEMS-III (Electrical and Electronics Engineering) - OR Time: 3 hours Max. Marks: 70
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Answer any FIVE questions All questions carry equal marks --Explain with an example of an open ended transmission line the concepts of reflections and refractions of travelling wave. A surge of 10 KV magnitude is travelling along a cable towards its junction with an overhead line. The inductance and capacitance of the cable and overhead line are respectively 0.1875 mH, 0.25 F and 0.9375 mH, 0.0075 F per Km. Find the voltage rise of the junction due to the surge. Describe and compare the following methods of neutral grounding: (i) Solid grounding (ii) Resistance grounding (iii) Reactance grounding and (iv) Transformer grounding. How is a Bewley Lattice diagram useful in determining the voltage at a point on a transmission line? Explain. Draw the expulsion type lightning arrester and explain its operation. To what voltage loads can this be used on power system. What are horn gaps? How are they useful in protecting equipment on a power system against over voltages?
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Explain the process of current chopping in SF6 breakers. A 3-phase oil circuit breaker is rated at 1000 A, 1500 MVA, 33 KV, 4S. Find the rated normal current, symmetrical breaking current, making current and short time current rating.
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Explain the characteristics of an HRC fuse and discuss how they are useful in circuit breaking. With a neat circuit schematic, explain the working of a static over-current relay with inverse time characteristic.
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What are the different types of distance relays? Compare their merits and demerits and give their field of applications. Explain the principle of operation of differential protection. What are its limitations? What modifications are required to make it free from mal operation?
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Code No. 410253
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Draw and explain the connecting diagram of a star/delta power transformer using percentage differential relays. What is Tran slay protection? Give such a scheme of protection for 3-phase transmission line. Write short notes on the following: a) Prime mover failure protection scheme of generators. b) Induction disc relay. c) Surge absorber.
Code No. 410253 IV/IV B.Tech. I-Semester Examination November ...
grounding (ii) Resistance grounding (iii) Reactance grounding and (iv) · Transformer grounding. b) · How is a Bewley Lattice diagram useful in determining the ...
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