High voltage circuit breakers known as 400 kV SF6 circuit breakers employ the gas sulphur hexafluoride (SF6) as the interrupting medium. To prevent electrical equipment from being harmed by short circuits, overloads, or other electrical problems, these circuit breakers are generally employed in extra high voltage (EHV) power transmission networks.
Because SF6 gas is an excellent insulator, circuit breakers can operate at high voltages without arcing. The circuit breaker stops the current when a fault develops by putting out the arc that forms between the contacts. Due to its high dielectric strength and chemical stability, which prevents it from reacting with other materials, SF6 gas is used to put out the arc.
There are three primary components that make up 400 kV SF6 circuit breakers: the interrupter unit, the operational mechanism, and the control system. Contacts and SF6 gas, which is used to put out the arc, are both inside the interrupter unit. While the control system monitors and regulates the operation of the circuit breaker, the operating mechanism is used to open and close the contacts.
For EHV electrical protection, 400 kV SF6 circuit breakers are a dependable and effective option. To maintain optimal operation and avoid breakdowns, they do need routine maintenance and testing. It is significant to remember that SF6 gas is a greenhouse gas, and many nations control its usage to lessen its influence on the environment. As a result, if feasible, alternatives should be investigated and SF6 gas usage should be kept to a minimum.
