GTU Electrical and Electronic Engineering (Semester 7)
Switch Gear & Protection
June 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Derive the necessary formula of Rate of Rise of Restriking Voltage [RRRV].
7 M
1 (b) Explain Construction, Working Principle and characteristics of HRC Fuse.
7 M

2 (a) Explain Construction, Working Principle of Vacuum circuit Breaker.
7 M
Answer any two question from Q2 (b) or Q2 (c)
2 (b) Explain Construction, Working with Advantages of Air Blast Circuit Breaker.
7 M
2 (c) Write a short note on Instrument Transformers.
7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)
3 (a) Explain working principle of current transformer and potential transformer.
7 M
3 (b) Explain the ratio error and phase angle error of current transformer.
7 M
3 (c) Explain Balanced Beam type relay.
7 M
3 (d) Explain Different Characteristic of distance relay.
7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)
4 (a) Difference between Static and Conventional [Electromagnetic] relay.
7 M
4 (b) Explain the faults and abnormalities of Generator. Explain Restricted Earth Fault Protection of Generator.
7 M
4 (c) Explain Buchholtz Relay protection.
7 M
4 (d) Explain Differential Protection and Biased differential Protection.
7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)
5 (a) Explain Translay relay with necessary diagram.
7 M
5 (b) Explain method of Neutral Grounding Explain any two with Advantages.
7 M
5 (c) Explain function of Lightning Arrester. Explain Different types of Lightning Arrester.
7 M
5 (d) Explain Bus-bar Protection in Detail.
7 M



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