Feasibility of Using Trifluoromethyl Iodide as a Replacement for SF6 in High Voltage Switchgear
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Gas Transmission Networks
The high global warming potential of SF6 gas has encouraged research for
alternative gases and mixtures in order to address the environmental issues.
In recent years, several mixtures of SF6 gas have been the subject of
investigations by academics and manufacturers, including a large European
project. However, these have led to a mere small incremental progress, and
therefore, it is desirable to find an alternative gas to SF6 and remove it
completely from future electrical power applications.
Research work initiated at Tokyo University in Japan has investigated the
electrical insulation characteristics of CF3I gas, a gas which is widely used
for fire extinguishing applications. It possesses the important physical and
chemical properties of SF6, but has a much lower global warming potential.
The project aims to establish the feasibility of using CF3I in high voltage
switchgear applications and identify those areas which would require further
work in order to achieve application.
The project will establish the feasibility of trifluoromethyl iodide (CF3I) as an
environmentally compatible alternative to sulphur hexafluoride (SF6) in high
voltage switchgear applications and identify those areas which would require
further work in order to achieve application.