Custom SF6 Circuit breaker Supplier, Exporter

1 / 5

Custom SF6 Circuit breaker Supplier, Exporter

SF6 circuit breakers are switchgear that utilizes SF6 gas as both insulation and arc-extinguishing medium. They offer advantages such as strong arc-extinguishing capability, excellent insulation performance, large breaking capacity, and no reignition. Their working principle is as follows: when the contacts open, an electric arc is generated. The SF6 gas is ionized under the high temperature of the arc, and then the gas flow generated by the piston extinguishes the arc. Simultaneously, its excellent dielectric strength and thermal conductivity also provide insulation and heat dissipation. This type of circuit breaker is suitable for high-voltage power systems and is commonly used at voltage levels of 110kV and above.

Send Inquiry

Product Description

Operating Principle

During closing: The operating mechanism moves the moving contact to the left, ensuring good contact with the stationary contact, completing the closing operation.

During opening:

Arc discontinuation: Contact separation generates an arc.

Airflow generation: The moving contact moves the piston, compressing the SF6 gas in the arc-extinguishing chamber, forming a high-speed airflow.

Arc extinguishing: The airflow is blown longitudinally through a nozzle, quickly extinguishing the arc.

Insulation and heat dissipation: The high insulation strength and good thermal conductivity of SF6 gas ensure that breakdown does not occur during or after arc extinguishing, while effectively absorbing and dissipating heat.

Gas circulation: After the arc is extinguished, a portion of the SF6 gas is discharged through the inner hole of the stationary contact and transported to the high-voltage chamber by a gas pump, completing gas circulation and reuse.

Key Advantages

Excellent Arc Extinguishing Performance: Effectively extinguishes electric arcs, has a large breaking capacity, and is less prone to reignition when breaking capacitive or inductive currents.

High Insulation Level: The dielectric strength of SF6 gas is 2-3 times that of air, and under certain pressures, it can reach or even exceed the level of insulating oil.

Compact Structure: The high insulation level allows for a reduction in the number of circuit breaker contacts, thus reducing equipment size.

Reliable Operation: Long electrical life, long maintenance cycles, and no fire hazard, suitable for frequent operation.

Application Scenarios

Primarily used in 110kV and above high-voltage power transmission and transformation systems, such as for the control and protection of transmission lines. It can also be used as a tie-type circuit breaker.

It can also be used in medium-voltage applications, such as for capacitive and inductive loads like capacitor banks, compensating reactors, and motors.

Product Display

Frequently Asked Questions

What is the primary function of an SF6 circuit breaker?

The primary function is to control and protect high-voltage electrical power systems by switching circuits on and off and extinguishing electric arcs safely.

Why is SF6 gas used as an extinguishing medium?

SF6 (Sulfur Hexafluoride) has excellent electronegativity and thermal conductivity, which allows it to absorb electrons and dissipate heat much faster than air, making it superior for quenching arcs.

Does the SF6 circuit breaker require frequent maintenance?

No, due to the stable chemical properties of SF6 gas and the sealed design of the arc chamber, these circuit breakers offer long electrical lives and very long maintenance cycles.

Are SF6 circuit breakers suitable for outdoor installation?

Yes, most high-voltage SF6 circuit breakers are designed for outdoor transmission and transformation systems, though indoor medium-voltage versions also exist.

Can SF6 gas be reused?

Yes, our systems are designed with gas circulation mechanisms. After arc extinguishing, the gas can be filtered, cooled, and transported back for reuse, ensuring efficient operation.

What is the dielectric strength of SF6 compared to air?

Under the same pressure, the dielectric strength of SF6 gas is approximately 2 to 3 times that of air, which helps in significantly reducing the size of the equipment.