### POWER SYSTEMS TRANSIENTS- 8th semester nov/dec 2009 question paper (common to eee dpt, BE(part time )7th semester)

BE.DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Eighth Semester

Electrical and Electronics Engineering
EE1003 - POWER SYSTEMS TRANSIENTS
(Common to BE. (Part-Time)
Time.: Three hours Maximum: 100 marks.

PART A- (10X2=20 marks)

1.What are the causes of transients?
2.Name the different types of transients.
3.Define Restriking Voltage.
4.What is meant by current chopping?
5.What are the protective devices used to protect power system equipments against
lightning?
6. What are the properties of a good transmission line?
7. What is the importance of Bewley's Lattice Diagram?
8. Draw the equivalent circuit for an infinitesimal element of a line.
9. Mention any four causes of switching surge.
10. State the applications of EMTP.

PARTB-(5 x 16= 80 marks)

11.(a)(i)Write a short note on voltage surge.(8)
(ii)Give a brief note about the importance of transient study in planning.(8)

or
(b)(i)What are the various types of transients?(8)
(ii)Discuss about the effects of transients on power systems.(8)

12.(a)Derive an expression for the transient currents.in a RLC circuit when:
(i)R=0(8)
(ii)R2/4V=1ILC(8)

Or

(b) Write short notes on :
(i) Current chopping(8)
(ii)Resistance Switching(8)

13.(a) i)Write short notes on cloud formation.(8)
ii)Explain about grounding a line structure.(8)

Or

(b)(i) Explain the mechanism of Lightning discharge.(8)
(ii) List some characteristics of Lightning strokes.(8)

14. (a)Explain the steps involved in Bewley's Lattice diagram construction with
an example. (16)

Or

(b)Obtain the value of current in a transmission line considering its series
and shunt lumped parameters.(16)

15. (a) Explain in detail abOut the switching surges in a power system.(16)
Or
(b)Explain in detail how EMTP is used for the computation of Transients in power system(16).

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