In power equipment, SF6 gas has become a key medium for core equipment such as high-voltage switches and GIS (gas insulated metal enclosed switchgear) due to its insulation and arc extinguishing performance. And its precise flow control is the core link to ensure the safe and stable operation of equipment and extend its service life.

Air pressure shield with insulation performance

The insulation strength of SF6 gas is closely related to the gas pressure. Improper flow control leading to pressure fluctuations can directly weaken insulation performance. For example, in GIS equipment, if the flow rate during the inflation phase is too high, it may cause electric field distortion due to local airflow impact, reducing insulation margin; Insufficient flow during operation can lead to a decrease in air pressure, significantly weakening the gas insulation strength and increasing the risk of corona discharge or even breakdown. Accurate flow control ensures that gas molecules fully cover the surface of insulating components by maintaining stable air pressure, forming a uniform "pressure shield" and effectively blocking arc channels.

Time window for arc extinguishing performance

When the circuit breaker breaks the fault current, SF6 gas needs to extinguish the arc in a very short time (milliseconds). Accurate flow control directly affects the gas density and flow rate inside the arc extinguishing chamber: too small a flow rate can cause the arc energy to not dissipate quickly, leading to reignition; Excessive flow may prolong the arc combustion time and accelerate contact erosion due to turbulent airflow. By dynamically adjusting the flow rate, a stable "airflow vortex" can be formed inside the arc extinguishing chamber, evenly dispersing the arc energy and achieving reliable arc extinguishing within the optimal time window.

Long term guarantee of equipment lifespan

Long term flow deviation can lead to accelerated aging of seals and corrosion of metal components. Accurate flow control reduces air pressure fluctuations, lowers internal stress in equipment, and extends the service life of seals; At the same time, a stable operating environment can suppress the generation of SF6 gas decomposition products, reduce chemical erosion of insulation materials, and ensure long-term reliability of equipment from the source.

From insulation to arc extinguishing, from transient response to long-term stability, precise control of SF6 gas flow runs through the entire life cycle of power equipment operation, serving as an "invisible guardian" to ensure grid safety and improve equipment efficiency.