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Unformatted text preview: outdoor)
(iv) Bus-bars operate at ........... voltage.
(v) Isolator is an ........... switch. ANSWERS TO SELF-TEST
1. (i) protective (ii) circuit interrupting (iii) no load (iv) arc (v ) closed (vi) relay (vii) shut down
(viii) lower (ix) duplicate (x ) 66
2. (i) both detection and interruption (ii) circuit interruption (iii) outdoor (iv) constant (v ) air CHAPTER REVIEW TOPICS
1. What do you understand by switchgear ?
2. Discuss the various types of switches.
3. What is the difference between
(i) a switch and circuit breaker
(ii) a fuse and circuit breaker ?
4. Discuss the different types of bus-bar arrangements.
5. Explain the various methods of accommodating high-voltage switchgear. DISCUSSION QUESTIONS
7. What are the limitations of a fuse ?
Why do we use C.T. in the relay circuit ?
What is the necessity of bus-bar ?
Why do we use isolators on both sides of the circuit breaker ?
Why are isolators not opened on load ?
Which faults ___ symmetrical or unsymmetrical ___ are more frequent in power system and why ?
Suddenly a circuit carries a current 20 times the normal current. Is there possibility of short-circuit or
overload ? GO To FIRST...
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This note was uploaded on 11/12/2012 for the course MBA 101 taught by Professor Muhannad during the Spring '12 term at Bradford School of Business.
- Spring '12