Answer / aariz ali

1)impedence relay is used for transmission lines protrction and diffrential relay is used for alternator protection.
also you can give their operational dirrerence.
2)ans: transformers, circuit breakers, isolators , realys etc ETC....
3)ans: the main difference is of the arc quenching medium which is only used in circuit breakers but not in isolator.
4) ans: air blast, vaccum, sf6, oil circuit breakers.
5)ans: SF6 medium is most commonly used because:
-sf6 gas is non inflammable so there is no any risk of fire in these ckt breakers.
-sf6 has high dielectric strenght so these breakers have short arcing time
- due to enclosed circuit these breakers have no moisture problem.
-small noise
etc etc.

We have studied about many techniques for finding the stability of system, ROOT LOCUS, ROUTH, BODE PLOT, POLER PLOT etc. In these which is used where. what are the difference among them... PLZ tell me.......

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