The harmfulness of six sulfur fluoride gas exceeding standard
The use of six sulfur fluoride gas is known to have two properties. One is the physical nature. Pure SF6 gas is colorless, tasteless, nontoxic and non burning, which is an inert gas. Under the pressure of 0.098MPa, the proportion of the air to the air is 5.19 (6.9/1.29), and the liquefaction temperature is -62 C. And the other is chemical. SF6 gas is insoluble in water and transformer oil. It is still inert gas when it is below 800 C, and it does not burn. It does not interact with hydrogen, oxygen, aluminum, copper and many other substances under hot temperature. Water, acid and alkali will not decompose it.
Under normal conditions, six sulfur hexafluoride gas is colorless and tasteless, and has good insulation and arc extinguishing performance. Once the moisture in the atmosphere is immersed or the surface of the solid is wetted, the electrical strength will decrease significantly. The circuit breaker is outdoor equipment. When the temperature drops suddenly, the excessive water of SF6 gas may coagulate on the surface of solid medium and cause flashover. Pure SF6 gas will decompose into fluorocarbon, sulfur and fluorine sulfur compounds after being discharged by arc or high temperature in operation, and the stable SF6 gas will be synthesized after the arc disappears.
When the water containing six sulfur hexafluoride gas, the fluorine sulfur compounds react with water to form a strong corrosive hydrofluoric acid, sulfuric acid and other toxic chemical substances, endangering the maintenance personnel life safety, causing corrosion of circuit breaker insulation material or metal material, the insulation deterioration, and even explosive equipment.
So you want to completely remove SF6 high purity gas six sulfur hexafluoride circuit breaker in the water is not possible, but the master SF6 gas water exceed the standard reasons, to take corresponding prevention and control measures, reduce the SF6 gas in the water, to ensure and improve the safety and reliability of circuit breaker.
The article is derived from six sulfur fluoride gas: www.feiliergas.com/