Single Pressure SF6 Circuit Breaker
In the SF6 circuit breaker the SF6 gas is stored at a high pressure around 20 BA in a pressure vessel. The contacts are opened and closed by the movement of the operating rod.
Construction of single pressure SF6 Circuit Breaker
- The single pressure type SF6 circuit breaker has more complex construction compared to non puffer
- It consists of high pressure SF6 reservoir, puffer chamber, and an arc-quenching nozzle.
- fixed and moving contacts are placed inside the puffer chamber.
- An operating mechanism is used to open and close the contacts.
- The high pressure SF6 gas is stored in reservoir and released into puffer chamber when needed.
Working of single pressure SF6 Circuit Breaker
- During normal condition the high pressure SF6 gas is contained in the reservoir and the contacts are closed.
- When any fault occurs the operating mechanism opens the contacts and at same time a valve releases a controlled amount of SF6 gas from the reservoir into the puffer chamber.
- Rapid release of SF6 gas generates high-pressure flow creates blast effect, cooling and quenching the arc.
- Arc is extinguished, and the contacts are fully opened.
Single pressure SF6 circuit breaker contact are closed
Single pressure SF6 circuit breaker contact are open
SF6 Circuit Breaker – Types, Construction, Working and Applications
Sf6 circuit breakers are used for their high interrupt capacity, compact design, and reliable performance these are important factors for modern electrical power systems especially in high voltage applications also SF6 gas is a potent greenhouse gas and is being made to reduce its usage and improve its environmental impact. In this article, we will study about SF6 Circuit Breaker and its functioning in detail.