The HVDC circuit breaker is a switching device that interrupts the flow of abnormal direct current in the circuit. When the fault occurs in the system, the mechanical contacts of the circuit breaker are pulled apart and thus their circuit is open. In HVDC circuit breaker, circuit breaking is difficult because the current flow through …
The rating of the circuit breaker is given on the duties that are performed by it. For complete specification standard ratings and various tests of switches and circuit breakers may be consulted. Apart from the normal working of circuit breakers, the circuit breaker is required to perform following three major duties under short circuit conditions. …
A fixed connection of resistance in parallel with the contact space or arc is called the resistance switching. Resistance switching is employed in circuit breakers having a high post zero resistance of contact space. The resistance switching is mainly used for reducing the restriking voltage and the transient voltage surge. Severe voltage occurs in the system …
A breaker which used vacuum as an arc extinction medium is called a vacuum circuit breaker. In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter. The arc is extinct as the contacts are separated in high vacuum. It is mainly used for medium voltage ranging from 11 …
Bulk Oil Circuit Breaker: A breaker which uses a large quantity of oil for arc extinction is called a bulk oil circuit breaker. Such type of circuit breaker is also known as dead tank-type circuit breaker because their tank is held at ground potential. The quantity of oil requires in bulk oil circuit breaker depends …
When the current carrying contacts of the circuit breaker are moved apart, an arc is formed, which insist for a short period after the separation of contacts. This arc is dangerous on account of the energy generated in it in the form of heat which may result in explosive force. The circuit breaker should be …
A circuit breaker in which SF6 under pressure gas is used to extinguish the arc is called SF6 circuit breaker. SF6 (sulphur hexafluoride) gas has excellent dielectric, arc quenching, chemical and other physical properties which have proved its superiority over other arc quenching mediums such as oil or air. The SF6 circuit breaker is mainly …
Oil circuit breaker is such type of circuit breaker which used oil as a dielectric or insulating medium for arc extinction. In oil circuit breaker the contacts of the breaker are made to separate within an insulating oil. When the fault occurs in the system the contacts of the circuit breaker are open under the …
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 …
When a fault occurs, the fault current flow to the ground due to which the potential gradient near the electrical equipment developed. This potential gradient may affect a person in two ways, either by step-to-step contact or by touch contact. Step-Potential – Step potential is the potential difference between the feet of a person standing on …
