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SF6

Sulfur hexafluoride (SF6) is a colorless, odorless, non-toxic gas with excellent electrical insulation properties, so it is widely used in power systems. Electrical insulation properties of sulfur hexafluoride (SF6) ...

Release time：2025-04-26

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Sulfur hexafluoride (SF6) is a colorless, odorless, non-toxic gas with excellent electrical insulation properties, so it is widely used in power systems.

Electrical insulation properties of sulfur hexafluoride (SF6)

One of the main advantages of sulfur hexafluoride is its excellent electrical insulation properties. It has a high breakdown electric field strength, which can reach more than 3MV/cm at room temperature. This means that under the same voltage conditions, the electrical insulation capacity of sulfur hexafluoride is stronger than that of traditional air or solid insulation materials. At the same time, the dielectric constant of sulfur hexafluoride is small, about 1.002-1.008, which is also conducive to reducing the concentration of the electric field and reducing the space occupied by the dielectric.

Application scenarios of sulfur hexafluoride (SF6) in electrical insulation

1. High-voltage substation:

Sulfur hexafluoride (SF6) is widely used in switchgear in high-voltage substations, such as circuit breakers, disconnectors and combined electrical appliances. Due to the high insulation capacity and chemical stability of sulfur hexafluoride, it can effectively prevent the breakdown and discharge of switchgear under high-voltage electric fields.

2. High-voltage transmission lines

Sulfur hexafluoride (SF6) is also commonly used in the insulation equipment of high-voltage transmission lines. During the power transmission process, due to the existence of potential difference, the line insulation equipment needs to have good insulation performance to prevent leakage and discharge between lines. The superior electrical insulation performance and high chemical stability of sulfur hexafluoride make it an ideal insulation material for high-voltage transmission lines.

3. Power capacitors

Sulfur hexafluoride (SF6) can also be used as the insulating medium of power capacitors. Power capacitors are widely used in reactive power compensation, power filtering and other aspects in power systems. As the insulating medium of capacitors, sulfur hexafluoride can provide stable insulation performance and ensure the efficient and stable operation of capacitors.

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