Sf6 circuit breaker energy storage rotation direction

How does a SF6 breaker work?

When the breaker operates, the moving contact is pulled apart, and an arc is struck between the contacts. Movement of the moving contact is synchronized with the opening of a valve which permits SF6 gas at 14 kg/cm2 pressure from the reservoir to the arc interruption chamber.

What are the advantages of SF6 circuit breakers?

Due to the superior arc quenching properties of the SF6 gas, the SF6 circuit breakers have many advantages over oil or air circuit breakers. Due to the superior arc quenching property of SF6, such circuit breakers have very short arcing time.

How does SF6 arc work?

Contacts are opened in high pressure flow of SF6 gas and an arc is struck between them. Conducting free electrons in the arc are rapidly captured by the gas to form immobile negative ions. This loss of conducting electrons in the arc quickly builds up enough insulation strength to extinguish the arc.

Can SF6 circuit breaker be stored outdoors?

The breakers if stored outdoors, should be well covered with tarpaulin. The tarpaulin should not be placed directly on breaker. An air gap should be left to prevent condensation. The minimum allowed ambient temperature for the Outdoor SF6 Circuit Breaker is (-)25°/ (-)40°C(optional). Structures may be stored outdoors.

Do SF6 breaker units need to be reconditioned?

Since SF6 gas has to be reconditioned after every operation of the breaker, additional equipment is required for this purpose. A typical SF6 circuit breaker consists of interrupter units each capable of dealing with currents up to 60 kA and voltages in the range of 50—80 kV. A number of units are connected in series according to the system voltage.

What is the minimum ambient temperature for the outdoor SF6 circuit breaker?

The minimum allowed ambient temperature for the Outdoor SF6 Circuit Breaker is (-)25°/ (-)40°C(optional). Structures may be stored outdoors. Spare parts should be stored indoors in a recommended storage area in their original packing. The entire assembly instruction should be read carefully before starting the assembly work.