06-05-2013, 04:20 PM
Seminar on circuit breakr
circuit breakr.ppt (Size: 359 KB / Downloads: 44)
An electrical power system is very complex.
For the safety of low voltage distribution ckt a fuse may be used but for heavier electrical equipments and majority of distribution and transmission network ,circuit breaker is used for the protection against the fault.
Minimum oil ckt breaker
Only small percentage of oil is used.
Constructin
1.Supporting chamber
2.circuit breaking chamber
3.top chamber
#Advantages:-
1.Smaller space
2.Reduce risk of fire
3.Maintanance problems
are reduce
OPERATING PRINCIPAL:-
# A circuit breaker essentially consist of fixed and moving contacts
# When fault occurs on any part of the system, the contacts of ckt breaker are separated ,the arc is struck between them.
# Production of arc not only delay the current interruption but also generates heat which may cause damage to the system or ckt breaker itself.
# The main problem in the circuit breaker is extinguish the arc within the shortest possible time so the heat generate by it may not reach a dangerous value.