Electrical power transmission networks are protected and controlled by high-voltage breakers.
SF6 gas filled and spring mechanism operated CBs are widely used in modern EHT systems
Basic operating principle of these breakers does not vary from any other LV or MV CBs
Sulphur hexafluoride (SF6) gas is a good arc quenching medium due to its low ionization property
SF6 has good insulation properties too
The chambers and the supporting hollow insulators are filled with SF6 gas
In the previous picture, the breaker is operated using a gang operated single mechanism box
SF6 High Voltage Circuit Breakers