High Voltage Circuit Breakers

  • 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
  • CBs with separate operating mechanism box for each pole are also in use.High Voltage Circuit Breakers
SF6 High Voltage Circuit Breakers


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