Anna University Chennai 2010-7th Sem B.E Electrical and Electronics Engineering /B.Tech emr/emr , ester, , EE1402-HIGH VOLTAGE ENGINEERING - Question Paper

B.E/B.Tech Degree exam November/December 2010,
Seventh Semester,
Electrical and Electronics Engineering,
EE1402-HIGH VOLTAGE ENGINEERING
ans all the ques..

Part-A
(10*2=20)
1. What are the causes of over voltage in a power system in few words?
2. Differentiate switching surge from lightning impulse.
3. What is ionization by collision?
4. Define Gas legal regulations.
5. Draw the simple voltage doubler circuit.
6. What is Deltatron circuit?
7. What are the advantages of CVT?
8. What are the merits of series resistance micro ammeter method?
9. Define 50% flash over voltage.
10. What are the tests conducted on power transformers?

Part-B
(5*16=80)
11.(a)(i) elaborate the causes for switching and power frequency over voltage? How they are controlled in power system? (12)
(ii) discuss lightning phenomena. (4)
Or
11.(b) elaborate the various methods employed for lightning protection of over head lines? explain in detail. (16)

12.(a) discuss the primary and secondary breakdown mechanism of gaseous dielectrics. (16)
Or
12.(b)Explain the different breakdown theories involved in commercial liquid dielectrics. (16)

13.(a) Draw and discuss the circuits for producing impulse waves. (16)
Or
13.(b)Explain any 1 method of generating HV AC at power frequency and explain its limitation/feature. (16)

14.(a) explain the different techniques for the measurement of impulse voltage. (16)
Or
14.(b)With a neat sketch discuss the sphere gap measurements for peak voltage measurement. (16)

15.(a) explain the different tests carried out in a circuit breaker at HV labs. (16)
Or
15. (b) What is the significance of impulse tests? Briefly discuss the impulse testing of insulators. (16)

Earning:   Approval pending.