26-03-2012, 03:46 PM
REFORMATION IN CIRCUIT BREAKER’S
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I N T R O D U C T I O N :
Faults Are Unavoidable
Protection Of Electrical Installation
Use Of Circuit Breaker(C.B.)
Substantial Progress In C.B.
Comparison Between Different Types Of C.B.
Most Reliable And Efficient C.B.
Mostly Used SF6 C.B.
New Upcoming Developed C.B.
WHY CIRCUIT BREAKER IS USED :
Mainly Performs Two Function
1. Switching Of Lines During
Normal Operation
2. Disconnection Of The Power
Supply In Case Of Overload
Or Short-Circuit
Cost Of Circuit Breaker Is Much
Less Than Electrical Appliances
Used In Power System
Auto Reclosure In Case Of
Transient Faults
AIR CIRCUIT BREAKER (ACB) :
Arc Extinguished By Arc Contacts
And Arcing Horns
Operates In Air
Arc Is Quenched By Lengthening It,
This Is Accomplished By Pushing
Arc Into Arc Chutes
OIL CIRCUIT BREAKER (OCB) :
Arc Extinguished By Oil
Arc Quenching Medium by Oil
Contacts Are Emerged In Large Tank Filled With A Medium(Oil)
Arc Formation Led To The Ionization Of The Medium And Formation Of Hydrogen Gas
Oil Is An Insulator
Used in 115KV, 230 KV
Interruption Capacity Can Be Increased Up to 26,000 MVA
There Are Two Type Of OCB:
>Bulk Oil Circuit Breaker(BOCB)
>Minimum Oil Circuit Breaker(MOCB)
Low Voltage Application
Breaking Capacity Up To 100KVA
General And Protection Of Electrical
Machines