Shivaji University 2009-5th Sem B.E T.E(Electrical)- , Power System Analysis - Question Paper
This is fifth semester ques. paper of 'Power system analysis' for the 3rd year electrical engineering students.
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Seat
No.
1\E. {Eieclrical) (Semester - V) (New) E.xaimatsanT 21)09 POWER SYSTEM ANALYSIS
Day ami Dale ; Thursday, 26-11-2009 Total Marks: I GO
Time: 10.30 a.m, to 130 p.m.
Instructions: /; Anempt any three qttestions from each Section.
2} Figures io the right indicate full marks.
3) Make .yidiahle amttnpuons whenever necessary.
SECTION!
}. A) Derive an expression for flux linkage due to single carreru carrying
conductors. 8
B) GUcii'l ate me capaciranee of a .1 (X) km long 30, 50 Hz overhead iransrnissiori line consisting of 3 conductors* each of diameter 2cm and spaced 2.5 in at the corners of an equi!;uera1 iri#ngie. . 8
2. A) Explain the following terms with reference to corona. 8
i) Critical disrupt* ve voltage 11) Visual erkieal voltage iii) Power loss clue to corona.
B) Exp!ain var ious me dfods of h npro ving scr.in.g dli.ciency, '8
3. A) 132 kv transmission Line has following data span length 260m, weight of
conductor 680 kgrrrr ukiroaie stress 3.100 kg. Is dor of safety 5 calculate the sag. 8
.B) Explain various methods improving string efficiency. 8
'i. Write a short notes (any three): 18
a) Ring main dislnbiMiou system
h) Pi n type i n sul ato rs
c) S kin and proximity dreci
d) Various rype of line supports.
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5. A) .Deri ve an ex p ressiott for send ip, g er.d vo! ta ge arvd c (.urcnt for long ir&nsm i;s s i on
line. 8
.8} Estimate fhe distLLrice over which a ;oac of 15 MW as: a. p.f 0.8 lagging can be delivered by a 3"ph&se tnLmission kn.e having conductors each of resistance ] ii per kiktfucter. The voltage al the recem;ig end is to be 132 kv and the looses in she transmission is ro be 5%. 8
6. A) Draw a r>eai sketch of the cross-section and explain 3-core belted cable. 8 B) Exp iain intershe atb gr r ding .method of cable g rad ins. 8
?. A; Derive the equation for losd ilow using Gauss-Seklal method. 8
B) A single phase motor eoiiiiecced to 400 V, 50Hz. supply kikes 3U A iu a power factor of 0.7 lagging. Calculate the capacitance required m parallel with the motor to raise she power factor to 0.9 lagging. 8
8. A) Derive the expression of conu/le?; power How diroiigb. a transmission line. 6 B) Discuss any one method of voltage control 6
C} Discuss any one method for power factor improvemehe. 6
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| Earning: Approval pending. |
