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Power System Engineering - High Voltage
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GAS INSULATED TRANSMISSION LINE(GIL)
WHAT IS GIL
• Gas Insulated Transmission Lines (GIL) are a means for bulk
power transmission at extra high voltage (EHV).
• the first installation of GIL in 1975, second generation
GIL has been developed
• GIL is installed in combination with Gas Insulated
Switchgear (GIS), compact solutions can be delivered in
order to supply large amounts of electric power
DATA OF GIL
Rated voltage: 230 kV – 550 kV
Rated current: 2500 A – 4000 A
Transmission capacity: 1000 MVA – 3800 MVA
Rated short-time current: 63 kA/3s
Rated Frequency: 50/60Hz
Capacitance: 55pF/m
Inductance: 220nH/m
Resistance: 10mW/km (typical)
Insulation gas: N2-SF6 mixture
Pipe materials: Aluminium alloys
LAYING METHODS OF GIL
• ABOVEGROUND INSTALLATION:
GIL installation aboveground is a trouble-free option, even for
extreme environmental conditions.
high transmission power can be achieved with above ground
installation.
LAYING METHODS OF GIL
• VERTICAL INSTALLATION:
Gas-insulated tubular conductors can be installed without a problem at
any gradient, even vertically.
They can be installed in a tunnel or shaft.
LAYING METHODS OF GIL
• TUNNEL INSTALLATION:
they can be installed in a tunnel or shaft.
The system stays accessible for easy inspection and high transmission
capacity is ensured.
LAYING METHODS OF GIL
• DIRECT BURIAL:
These systems are coated with a continuous polyethylene layer.
the land can be returned to agricultural use with very minor restrictions once
the system is completed.
ADVANTAGE
• GIL in tunnels has a very low environmental impact
compared to other transmission methods.
• GIL is highly efficient.
• GIL is extremely reliable.
• GIL is affordable.
• GIL emits little heat or electromagnetic radiation.
ADVANTAGE
• High transmission capacity.
• Low transmission losses.
• Low capacitance.
• High operational safety (no fire risk, no external impact in
case of internal failure).
• No practical ageing of components (long
lifetime).
FUTURE APPLICATION
• Long Distance AC-GIL.
• TransEuropean Networks.
• Offshore Windfarms.
• Improved Reliability of Electric Power.
Supply of Cities.
CONCLUSION