What is the principle of SF6 gas decomposition and ionization under high temperature arc?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What is the principle of SF6 gas decomposition and ionization under high temperature arc?

发布时间：2016-01-01 来源：ydlcb 浏览次数：170次

SF6 gas is a molecular gas with many atoms. The decomposition and ionization of SF6 gas at high arc temperature is very complicated. The arc center part of SF6 gas has low thermal conductivity, high temperature and high conductivity. 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. As a result, a very thin, bright arc can be seen in SF6 gas, and the external flame site is almost invisible. 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.