POWER SYSTEM TRANSIENTS -8th semester APRIL/MAY 2010 question paper (common to eee dpt, B.E. part-time seventh semester)

B.E./B.Tech.DEGREE EXAMINATION,APRIL/MAY 2010.
Eight Semester
Electrical and Electronics Engineering
EE1003-POWER SYSTEM TRANSIENTS
(Common to B.E. part-Time Seventh Semester)

Time:Three Hours Maximum:100 marks

PART A-(10*2=20 MARKS)

1. What is called Transient in a power system?
2. Why is transient essential in planning?
3. What is meant by resistance switching?
4. Define ferro-resonance.
5. What are the causes for over voltage?
6. What is called tower footing resistance?
7. Define lumped parameters.
8. Define standing waves.
9. Distinguish between line dropping and load rejection.
10. What are called switching surges?

PART B-(5*16=80 MARKS)

11.(a) With neat diagrams,describe any two types of power system transients in detail.(16)
or
(b) What are the source of transients?Also explain how transients affect the power systems.(16)

12.(a)(i) What is meant by circuit closing transients?(6)
(ii)Describe about double frequeny transients and basic transform of the RLC circuit.(10)

(b)(i)Distinguish between normal and abnormal switching transients in load switching.(8)

(ii)What is called current supression?Explain it.(8)

13.(a)(i)With a neat sketch,explain the characteristics of lightning strokes.(8)

(ii)What are the factors that contribute to good line design?(8)

or
(b)(i)Describe the interaction between lightning and power system.(8)
(ii)Derive the mathematical model for lightning.(8)

14.(a)Draw the step response of a travelling wave.Explain it by using Bewelly's lattice diagram.(16)
or
(b)Write elaborately on reflection and refraction of traveling waves.(16)

15.(a)Describe how the voltage is distributed in a power syatem.Derive the voltage transients on closing lines.(8+8)

or
(b)Write in detail about EMTP for transient computation(16)

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