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SF6安全保障专家
专注于SF6气体检测的专业化
What should I pay attention to when using SF6 gas?
发布时间：2019-09-22
来源：ydlcb 浏览次数：31次
Contact with SF6 should be carried out in a well-ventilated environment, and the person should stand upwind when handling and using sulfur hexafluoride gas.
1) SF6 gas new gas quality should meet the standard requirements.
2) SF6 gas in high voltage electric due to the role of high temperature arc will decompose and produce some low fluorine compounds, when there is water and oxygen in the equipment will further react, resulting in a variety of derived products. Most of these products have strong toxicity, and will corrode the relevant parts of the equipment, endangering the safety of the person or equipment, so SF6 must be strictly prevented from moisture mixed oxygen.
3) Because the density of SF6 gas is higher than that of air, if there is a leak, it must be deposited in low-lying places, and it has a suffocation effect on people and other animals. Once the leakage should pay attention to personal protection, SF6 gas collection and regeneration treatment.
4) As long as the SF6 gas electrical equipment is stored in the room for work, the personnel should be ventilated for more than 15 minutes before entering.
What are the hazards of mixing water in SF6 gas?
1) Water causes chemical corrosion, dry SF6 gas below 500 ° C, generally will not decompose by itself, and water, more than 200 ° C can produce water decomposition, such as HF, HF has a strong corrosive, in addition, the generated SO2 is also corrosive.
Under the action of electric arc, water and SF6 gas can form SOF2, SO2F4, SOF4, SF4 and HF, which are all toxic gases.
2) Moisture is directly harmful to insulation, usually the mixed water in the gas exists in the form of water vapor, saturated condensation into dew when the temperature is low, causing flashover or partial discharge along the surface.
The source of water in SF6 gas is:
(1) There is water in the new gas.
(2) Residual moisture in equipment components.
(3) Water intrusion during inflation.
(4) The solid parts of the equipment decompose and produce water.
(5) The equipment is poorly sealed and infiltrated with water.
As a widely used insulating medium, SF6 gas also has some problems in its use. SF6, as an insulating medium, is closely related to the humidity of the gas, that is, the moisture content. Under the action of arc corona, SF6 can chemically react with water to produce strong corrosive substances HF and highly toxic fluoride, endangering the safety of equipment and personnel, and may cause explosion accidents in serious cases. When the humidity of SF6 gas in the equipment is too high, and the water exists in liquid on the surface of the insulating parts, the discharge voltage on the surface of the insulating parts will be reduced, and the internal insulation of the equipment will be reduced. The insulation of the equipment in operation is mainly related to humidity, but also related to other parameters such as temperature, pressure and so on. At the same humidity value measured at different pressures, the insulation level of the equipment is also different. Therefore, content detection and moisture control are very important for safe power supply and water supply.
There are two main standards for the moisture test of sulfur hexafluoride gas:
Standard for moisture test of sulfur hexafluoride gas (20℃, 0.1013MPa)
① circuit breaker interrupter chamber gas chamber: not more than 150ppm after newly inflated, not more than 300ppm in operation;
② No arc decomposition gas chamber: no more than 250ppm after newly inflated, no more than 500ppm during operation.
Where does sulfur hexafluoride get most of its water? The main sources of water inside the sulfur hexafluoride equipment are:
① Moisture contained in sulfur hexafluoride new gas;
② Moisture entering the equipment during assembly;
(3) Water released from solid insulating objects;
④ Water infiltrated through the seal during operation;
(5) Water entered during multiple air replenishment and testing during operation;
⑥ air chamber adsorbent failure.