Sf6 Outdoor Circuit Breakers

DAYA Sf6 Outdoor Circuit Breakers  Details

SF6 CBs are used in substations for all voltages ranging from 144 to 765 kV or even above. Continuous currents up to 8000 A, and symmetrical interrupting ratings up to 63 kA at 765 kV and 80 kA at 230 kV. The interrupter unit of sulphur hexafluoride (SF6) circuit breaker consists of fixed and moving contacts enclosed in a chamber.

In the case of high voltage circuit breakers quick arc extinction properties are used which require less time for quick recovery, voltage builds up. SF 6 circuit breakers have good properties in this regards compared to oil or air circuit breakers. So in high voltage up to 760 kV, SF 6 circuit breakers is used.

DAYA GCK Low Voltage Sf6 Outdoor Circuit Breakers Working conditions

In an SF6 Circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium.

The sulphur hexafluoride gas (SF6) is an electronegative gas and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a high-pressure flow sulphur hexafluoride (SF6) gas and an arc is struck between them. 

The gas captures the conducting free electrons in the arc to form relatively immobile negative ions. This loss of conducting electrons in the arc quickly builds up enough insulation strength to extinguish the arc.

Comparing to other circuit breaker types, the SF6 circuit breakers have been found to be very effective for high power and high voltage service.

SF6 CBs are used in substations for all voltages ranging from 144 to 765 kV or even above. Continuous currents up to 8000 A, and symmetrical interrupting ratings up to 63 kA at 765 kV and 80 kA at 230 kV.

DAYA Sf6 Outdoor Circuit Breakers Parameter (Specification)

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DAYA Sf6 Outdoor Circuit Breakers Processing characteristics

• Simplicity of the interrupting chamber which does not need an auxiliary breaking chamber;
• Autonomy provided by the puffer technique
• The possibility to obtain the highest performance, up to 63 kA, with a reduced number of interrupting chambers
• Short break time of 2 to 2.5 cycles
• High electrical endurance, allowing at least 25 years of operation without reconditioning;
• Possible compact solutions when used for gas insulated switchgear or hybrid switchgear
• Integrated closing resistors or synchronized operations to reduce switching over-voltages
• Reliability and availability
• Low noise levels