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SF6安全保障专家
专注于SF6气体检测的专业化
What is the formation principle of SF6 gas arc extinguishing ability?
发布时间：2016-07-12
来源：ydlcb 浏览次数：80次
SF6 molecule has strong electronegativity, which makes SF6 have strong arc extinguishing ability. Because SF6 molecules become negative ions after adsorption of free electrons, negative ions are easy to combine with positive ions to form neutral molecules, so that the electrical conductivity of the arc space quickly disappears. Especially when the arc current is close to zero, this effect is more significant. If SF6 gas is used to blow the arc, a large number of fresh SF6 molecules are constantly in contact with the arc, and the arc is extinguished more rapidly.
Due to the strong arc extinguishing ability of SF6 gas, the change rate from conductive arc to insulator is particularly fast, so the breaking current of SF6 circuit breaker is large, and the breaking time is short. Under the same voltage level, the same breaking current and other conditions are the same, SF6 circuit breakers have fewer series breaks.
SF6 gas is a molecular gas with many atoms. The decomposition and ionization of SF6 gas under high arc temperature is very complicated. The arc center part of SF6 gas has low thermal conductivity, high temperature and large conductivity, and the outer flame part has high thermal conductivity, low temperature and small conductivity, so the arc current is almost concentrated in the arc center part. Therefore, in SF6 gas, you can see a very thin, very bright arc, and you can hardly see the external flame site. This is also one of the reasons for the short arc extinguishing time of SF6 gas.
When the arc current is reduced to zero, SF6 molecules are significantly electronegative at this time, so that the current is continuous, and the small arc center can exist to a very small current range. This feature of SF6 arc makes the circuit breaker break a small current, and will not produce an operating overvoltage due to the intercepting effect.
SF6 gas is a molecular gas with many atoms. The decomposition and ionization of SF6 gas under high arc temperature is very complicated. The arc center part of SF6 gas has low thermal conductivity, high temperature and large conductivity, and the outer flame part has high thermal conductivity, low temperature and small conductivity, so the arc current is almost concentrated in the arc center part. Therefore, in S
In the F6 gas, you can see a very thin, very bright arc, and you can hardly see the external flame site. This is also one of the reasons for the short arc extinguishing time of SF6 gas. When the arc current is reduced to zero, SF6 molecules are significantly electronegative at this time, so that the current is continuous, and the small arc center can exist to a very small current range. This feature of SF6 arc makes the circuit breaker break a small current, and will not produce an operating overvoltage due to the intercepting effect.