Skip to main content

CIRCUIT BREAKER

Circuit breaker

Circuit breakers are mechanical devices designed to close or open contact ends,thus closing or opening an electrical circuit under normal or abnormal conditions.
Circuit breaker consists of fixed and moving contacts which are touching each other under normal conditions and whenever a fault occurs,the trip coil gets energised,the moving contacts are pulled by some mechanism and so the circuit breaker is opened and the circuit is broken and when ever this interruption occurs an arc is inevitably formed between the contacts which prolongs the current interruption process for a duration ranging from 10 to 100 or more ms.
The fluids used in the circuit breaker should posses the properties of
1.High dielectric strength
2.Non inflammability
3.High thermal stability
4.Chemical stability
5. Arc extinguishing ability
6.Commercial availability at moderate cost.
Automatic circuit breakers are usually employed for the protection of electric circuits,are equipped with a trip coil connected to a relay or other means,designed to open the breaker automatically under abnormal conditions.
Types of Circuit Breakers
1.Oil Circuit breaker
2.Low voltage air Circuit breaker
3.Air blast Circuit breaker
4.Vacuum Circuit breaker
5.Sulphur Hexafluoride Circuit breaker

Comments

Popular posts from this blog

GENERATOR

GENERATOR: A Generator is a machine which converts Mechanical energy into Electrical energy.These are widely used inside the Power plants for the generation of Power. Generator In general the Generator we see in a Thermal power plant gains its mechanical energy from the Turbine connected to it and this mechanical energy is thus converted into the required Electrical energy by the Generator.I myself  experienced a 15 days of internship in a Thermal power plant and the Generator was about the size of a lager hall both in its length and breadth and the output Electrical energy is thus achieved by the use of a Generator.

SWITCHING TRANSIENTS IN TRANSFORMER

Switching Transients: The word Transients is always very Scary for me but not any more hahaaa...........what about you???? Well coming to the point...why do these Switching Transients occur in a Transformer. When the switch is closed when the voltage is maximum...then the flux required by the core is zero and the available flux in the core is also zero and hence NORMAL OPERATION is sufficient When the switch is closed when the voltage is crossing zero...then the flux required by the core is maximum but here the avaliable flux in the core is zero and hence TRANSIENT OPERATION is required Here when the Transient operation takes place then the flux doubles gradually and this is known as Doubling Effect of Transformer.This Doubling Effect causes magnetic in rush current and Damage in the insulation. Using Secondary Harmonic Restraining Coil can reduce all these Drawbacks.

Application of Artificial Neural Network in Power electronics