EE2402 Protection & Switchgear important Questions
1. What is neutral grounding? And explain the types of grounding with their phase
diagrams
2. Discuss the basic requirements of protective systems
3. Explain briefly the types of faults in a power system
4. Explain Neutral grounding in detail
5. Discuss the procedure for computation of fault currents in power systems when a
double line to ground fault occurs
6. Explain the operating principle and characteristics of impedance relay
7. Draw and explain the operating principle of non-directional over current relay or earth
leakage (induction type) relay
8. Explain differential relay and its types in detail
9. Describe the operating principle of an attracted armature type relay
10.Explain Merz price voltage balance system and translay scheme for line protection
11.What is biased differential protection? Explain how it can be used to protect an
alternator against stator faults
12.Explain the distance protection of transmission line
13.Explain the pilot wire relaying schemes for protection of transmission lines
14.Define the term restriking voltage. Derive an expression for that and explain the effects
of this on the operation of circuit breaker under fault condition
15.Explain the phenomenon current chopping and capacitive current breaking with
diagrams and waveforms
16.Define resistance switching and derive the expression for it
17.Explain the various tests conducted on circuit breakers
18.Explain the working principle of SF6 circuit breakers with its diagram
19.Explain the construction and working principle of Air blast circuit breakers.
20.Explain with a neat sketch, the construction and working of minimum oil circuit breaker
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