20th September 2018


Why sf6 gas is used in circuit breaker?

SF6 gas is electronegative and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a high-pressure flow of sulphur hexafluoride gas, and an arc is struck between them. Sulfur hexafluoride is generally used in present high-voltage circuit breakers at rated voltage higher than 52 kV.

Keeping this in view, is sf6 is toxic?

Therefore, this limit does not mean that higher SF6 concentrations pose any toxic hazard. According to Clause 7.1 of IEC 60480: “In principle, a mixture of 20% of oxygen and 80% SF6 can be inhaled without adverse effect. Concentrations above 20% would cause suffocation due to lack of oxygen.

What is sf6 gas used for?

Sulfur hexafluoride. An inert gas used mainly as a test gas in respiratory physiology. Other uses include its injection in vitreoretinal surgery to restore the vitreous chamber and as a tracer in monitoring the dispersion and deposition of air pollutants. Sulfur hexafluoride is a Contrast Agent for Ultrasound Imaging.

Is sf6 symmetrical?

It shares a similarity with the shape of SF6 in that both these shapes have an atoms in an axial plane. The difference with SF6 is this adopts an octahedral shape, with four fluoride atoms at equatorial positions , making a square and thus, symmetrical with right angles between each.
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