Sulphur hexafluoride possesses very good insulating and arc quenching properties. Which is using as breaker.
These properties are
1. It is colourless, odourless, non-toxic, and non-inflammable gas.
2. SF6 gas is extremely stable and inert, and its density is five times that of air.
3. It has high thermal conductivity better than that of air and assists in better cooling current carrying parts.
4. SF6 gas is strongly electronegative, which means the free electrons are easily removed from discharge by the formation of negative ions.
5. It has a unique property of fast recombination after the source energising spark is removed. It is 100 times more effective as compared to arc quenching medium.
6. Its dielectric strength is 2.5 times than that of air and 30% less than that of the dielectric oil. At high pressure the dielectric strength of the gas increases.
7. Moisture is very harmful to SF6 circuit breaker. Due to a combination of humidity and SF6 gas, hydrogen fluoride is formed (when the arc is interrupted) which can attack the parts of the circuit breakers.
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