g3-filling: a mastered process
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In 2014 at CIGRE in Paris, Utilities and T&D experts discovered g3 (g cubed), an alternative SF6-free solution to replace SF6 in high voltage equipment. Since then, many grid operators across the world who are concerned about the environmental impact of their grid, have implemented diverse g3 equipment. The filling of g3 into gas-insulated equipment is part of a fully-mastered handling process, like SF6. The g3 offering is delivered as a ready-to-use cylinder together with a dedicated, fully-automated service cart. Overall, a very simple process.
g3 is a gas mixture, so what?
g3 is a mixture compound of three gases, said fluoronitrile ((CF3)2-CF-CN), carbone dioxide (CO2) and oxygen (O2).
Each component has its own purpose.
- The fluoronitrile provides dielectric strength to the gas mixture thanks to the nitrile triple bond combined with fluorine.
- CO2 handles the arc interruption process.
- Oxygen plays a major role in the gas chemical decomposition especially in case of heavy arc interruption.
Though it is a gas mixture, in its gaseous form, it behaves exactly like a single gas, similar to how SF6 behaves.
Picture 1: Fluorinated Nitrile molecule used in the g3-gas mixture