It is a condition for sulfur hexafluoride to produce toxic substances that water is strictly prohibited from entering the work production.If sulfur hexafluoride gas contains more than the specified moisture,when its humidity changes,it may condense on the solid insulating surface and make the surface moist.In this case,the discharge voltage along the surface of the equipment will drop significantly.

　　Sulfur hexafluoride gas decomposition under the action of arc and corona generated low fluorine compound gas,if there is no water molecules this external conditions will not generate SO2,HF and other harmful substances,so as to avoid equipment corrosion produced by them.Therefore,equipment filled with sulfur hexafluoride must be tightly controlled to prevent moisture entry.

　　Before the work begins,the relative humidity of the ambient air around the site should first be measured≤80%(that is,the percentage of the density of water vapor in the air and the ratio of saturated water vapor at the same temperature),which is the specific indication of the water content of***sulfur hexafluoride gas.If the determination is not qualified,measures should be taken or re-selected dry and sunny weather for filling.

　　In order to make the leakage of SF6 gas timely replacement,the main tip in the charging at the same time open the fan,carefully comply with the air SF6 content shall not exceed 1000ppm.Within a certain time after the start of the work should be tested,and specific conditions in the middle of the test side.When sulfur hexafluoride gas levels increase or exceed the standard,the components shall be immediately inspected in detail to find the cause and eliminate it.

　　The above is the Luoyang sulfur hexafluoride factory Phillier special gas factory for you to analyze why sulfur hexafluoride gas is strictly prohibited to have water reasons.