Improving The Insulation In Arc Medium By Trifluroiodomethane (Cf3i) In Circuit Breaker
In power distribution system, sulfur hexafluoride (SF6) is used as Arc Extinguish in the high voltage circuit
breaker. Even though the SF6 gas has high dielectric strength, it affects the greenhouse if released in the atmosphere. The
major disadvantage of SF6 is leakage by unavoidable circumstance, which needs continuous monitoring. Arced SF6 gas is
poisonous and not should be inhaled. The internal parts need thorough cleaning periodically. Maintenance and transportation
of this gas also difficult. In this paper usage of mixture of trifluroiodomethane (CF3I) with CO as the potential alternative to
SF6 gas and its insulation properties are examined. The pure CF3I is impossible to use due to its high boiling point. SF6 and
CF3I have a number of similar properties: both gases are colorless, odorless and non-flammable. The weak chemical bond CI
in CF3I means that’s it can be decomposed quickly in the atmosphere.CF3I is considered to be an environmentally friendly.
CF3I provides dielectric strength which is higher than SF6 with less greenhouse potential. Analysis has been done in Finite
Element Method tool for different case of dielectric strength by considering ratio of SF6 and CF3I.
Keywords - Circuit breaker, insulation property, SF6-sulphur hexafluoride, CF3I -Trifluoroiodomethane, Finite element
tools, dielectric constant.