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Protection And Switchgear EE2402 7th Semester Question Paper - May / June 2014

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B.E./ B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014
Seventh Semester
Electrical and Electronics Engineering
EE 2402/ EE72/10133 EE702 – PROTECTION AND SWITCHGEAR
(Regulation 2008 / 2010)
(Common to PTEE2402-Protection and Switchgear for B.E. (Part – Time) Sixth semester Electrical and Electronics Engineering- Regulation 2009)


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PART A — (10 × 2 = 20 marks)

1. What are the difference types of faults occurring in the power system?
2. Write the importance of ground wire.
3. List out the different types of distance relay.
4. Write the merits of static relay.
5. Enumerate the concept of ring feeder.
6. List out the applications of current transformer.
7. How do you quench an arc in a circuit breaker?
8. What are the demerits of resistance switching?
9. Write the difference between the fuse and circuit breaker.
10. Define the operating time of circuit breaker.



PART B — (5 × 16 = 80 marks)

11. a) (i) Explain the importance of protective schemes employed in power system.
(ii) Write the essential qualities of protection.
(Or)
b) (i) Explain the protective schemes employed to protect formulating and switching effects.
(ii) Enumerate the basic concepts of insulation coordination.

12. a) Explain the construction and operating principle of over current relay with directional
Scheme.
(Or)
b) Describe the principles of
(i) Negative sequence relay.
(ii) Under frequency relay.

13. a) With a neat schematic diagram, explain the protection of transformer with differential
Protection scheme.
(Or)
b) Write brief notes on
(i) Generator protection.
(ii) Bus bar protection.

14. a) (i) Explain the physics of arc phenomena and interruption.
(ii) Describe the operating principle of DC circuit breaker.
(Or)
b) Write short notes on:
(i) Current chopping.
(ii) Interruption of capacitive current.

15. a) With a help of neat block diagram, explain the construction, operating principle and
advantages of SF6 circuit breaker.
(Or)
b) Briefly describe the different types of testing schemes of circuit breakers.

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