HV/MV Equipment - Gas-Insulated Lines : GE Grid Solutions


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	SF₆ Alternative - g³

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Gas-Insulated Lines

SF₆-free g³ Gas-Insulated Lines
For electrical networks up to 420 kV

Better for the grid, better for the planet

SF₆-free with g³, GE's game changing alternative to SF₆ as insulating medium enables a reduction of 99% of global warming potential
First-in-class gas sealing system
g³-420 kV GIL is a dual gas busbar system also compatible with SF₆. It allows TSO to still use SF₆ while being ready for up-coming regulations.
Improved tightness thanks to sealing length divided by 2 compared to previous version

Field-proven experience

Design grounded with 50 years of experience acquired with SF₆ gas insulated lines
g³ gas–insulated lines were the World first 420 kV SF₆-free GIL on the market (2015) and the first g³ product available on the market
Since then, some 10 sites – 5000+ meters

Smart grid features

Gas Masses Comparison

Specifications

Applications

Calculate the CO₂e reduction of my project with GE's g3 CO₂ equivalent calculator

RATINGS
Voltage	kV	362	420
Standards		IEC/IEEE	IEC/IEEE
Frequency	Hz	50/60	50/60
Withstand voltages, to earth - Short-duration power-frequency - Switching impulse - Lightning impulse	kV kV (peak) kV (peak)	650 1050 1425	650 1050 1425
Continuous current	A	4,000/5,000	4,000/5,000
Short-time withstand current	kA	63	63
Peak withstand current	kAp	170	170
Temperature	°C	-30	-25/-30

NATIONAL GRID, UK - Sellindge Substation
230 m of 420 kV GIL, 63 kA, 4000 A
The world first SF₆-free g³ GIL

SSEN TRANSMISSION, UK - New Deer Substation
1020 m of 420 kV GIL, 40 kA, 4000 A
The longest SF₆-free g³ GIL in operation

SP ENERGY NETWORKS, UK - Kilmarnock Substation
177 m of 420 kV SF₆-free g³ GIL, 63 kA, 4000 A