What Should Be Noted When Filling Sulfur Hexafluoride (SF6) Gas?

What should be noted when filling sulfur hexafluoride (SF6) gas?

Moisture is a condition for SF6 gas to produce toxic substances. If SF6 gas contains more than the specified amount of moisture, when its humidity changes, it may condense on the surface of the solid insulation, causing the surface to become damp. At this time, the discharge voltage along the surface of the equipment will significantly decrease. The SF6 gas decomposed into low fluorinated compound gas under the action of arc and welding. If there were no water molecules as an external condition, SO2, HF and other harmful substances would not be generated, thus avoiding equipment corrosion caused by them. Therefore, when filling SF6 equipment with gas, strict measures must be taken to prevent moisture from entering. (1) Before starting work, the relative humidity of the surrounding air on site should be measured to be ≤ 80% (i.e. the percentage ratio of water vapor density in the air to saturated water vapor density at the same temperature). This is the specific indication that limits the water content in the air. If the test is not qualified, measures should be taken or dry and sunny weather should be selected for filling. (2) In order to promptly replace the leaked gas of sulfur hexafluoride (SF6), the ventilation fan should be turned on while filling, and the regulation that the SF6 content in the air should not exceed 1000ppm should be strictly followed. Testing should be conducted within a certain period of time after the start of work, and the specific situation should be checked midway. When the SF6 gas content increases or exceeds the standard, a detailed inspection of the components should be carried out immediately to identify the cause and eliminate it.

The use of oil-free sulfur hexafluoride compressors is extremely important. The oil-free compressor adopts an oil-free structure design, which is more conducive to gas recovery, compression, and storage due to its zero gas pollution, light weight, and small size. The leak free design fully meets the strict requirements of greenhouse gas emissions. The main engine of the SF6 compressor for sulfur hexafluoride is an oil-free gas booster, which converts the rotational motion of the crankshaft into the reciprocating linear motion of the piston through a crankshaft, piston, and connecting rod mechanism. The volume composed of a cylinder and a piston undergoes periodic changes under the action of the piston, allowing the gas inside the cylinder to continuously complete the processes of intake, compression, exhaust, and expansion. After two-stage compression, the gas at a specific pressure is transformed into a compressed gas with a specified pressure.