Circuit Breaker
A circuit breaker is a switching device that interrupts the abnormal or fault current. It is a mechanical device that disturbs the flow of high magnitude (fault) current and in additions performs the function of a switch. The circuit breaker is mainly designed for closing or opening of an electrical circuit, thus protects the electrical system from damage.
A circuit breaker consists of fixed and moving contacts which touch each other and carry the current when the circuit breaker is closed. It can be opened and closed manually for the purpose of switching and maintenance.
But whenever a fault occurs on any part of the power system, the trip coil of the circuit breaker get energized and moving contacts are separated by some mechanism.
The separation of current carrying contacts strikes an arc between them. Once an arc is formed between contacts, the molecules of the medium surrounded by arc become extremely hot and get ionized i.e. insulating property of it is destroyed and it becomes conductor of electricity.
Therefore, the arc is maintained even if the contacts are further drawn. This arc not only delays the current interruption process but it also produces heat in a very large quantity which may cause damage to the system or to the circuit breaker itself.
Therefore, the main issue in a circuit breaker is to extinguish the arc in shortest possible time so that heat generated by it may not reach to a hazardous value.
The basic construction of circuit breaker requires the separation of contacts in an insulating medium.
This insulating medium extinguishes the arc between the contacts when circuit breaker opens. It also provides insulation between contacts and from each contact to earth.
2. Minimum Circuit Breaker
3. Sulphur Hexafluoride Circuit Breaker
4. Vacuum Circuit Breaker
5. Air Blast Circuit Breaker
6. Air Break Circuit Breaker
#technology
#unnoticed
#naveen
#hdiw
Circuit Breaker Operating Principle:
A circuit breaker consists of fixed and moving contacts which touch each other and carry the current when the circuit breaker is closed. It can be opened and closed manually for the purpose of switching and maintenance.
But whenever a fault occurs on any part of the power system, the trip coil of the circuit breaker get energized and moving contacts are separated by some mechanism.
The separation of current carrying contacts strikes an arc between them. Once an arc is formed between contacts, the molecules of the medium surrounded by arc become extremely hot and get ionized i.e. insulating property of it is destroyed and it becomes conductor of electricity.
Therefore, the arc is maintained even if the contacts are further drawn. This arc not only delays the current interruption process but it also produces heat in a very large quantity which may cause damage to the system or to the circuit breaker itself.
Therefore, the main issue in a circuit breaker is to extinguish the arc in shortest possible time so that heat generated by it may not reach to a hazardous value.
The basic construction of circuit breaker requires the separation of contacts in an insulating medium.
This insulating medium extinguishes the arc between the contacts when circuit breaker opens. It also provides insulation between contacts and from each contact to earth.
Types of Circuit Breaker:
1. Oil Circuit Breaker2. Minimum Circuit Breaker
3. Sulphur Hexafluoride Circuit Breaker
4. Vacuum Circuit Breaker
5. Air Blast Circuit Breaker
6. Air Break Circuit Breaker
#technology
#unnoticed
#naveen
#hdiw
Comments
Post a Comment
Feel free to write anything!!!