ieeeewh.ieee.org/conf/tdc/c_08td0790-gil-basiscs-2008-04-15...2008/04/15 · ieee/pes substation...
TRANSCRIPT
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IEEE/PES Substation Committee - GIS Subcommittee
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IEEE/PES Substation Committee - GIS Subcommittee
Substations CommitteeSubcommittee K0Working Group K2
ModuleGas Insulated Transmission Line (GIL)
Basics
IEEE
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IEEE/PES Substation Committee - GIS Subcommittee
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IEEE/PES Substation Committee - GIS Subcommittee
A Introduction to GILB Design Features of GILC Development and ManufacturingD Typical GIL LayoutE TestingF Installation
ContentsGIL Basics
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IEEE/PES Substation Committee - GIS Subcommittee
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IEEE/PES Substation Committee - GIS Subcommittee
A Introduction to GIL
ContentsGIL Basics
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Introduction to GIL420 kV Above Ground Installation
Cumulated Length 17 km - PP9 Saudi ArabiaLongest 420 kV GIL Installed in the World
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System Length 1 km - Palexpo, SwitzerlandUnderground Part of a GIL/Overhead Line
Introduction to GIL300 kV Tunnel Installation
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Introduction to GILGIL Units
Only 4 GIL units are needed to build a transmission line:
Straight unit
Angle unit
Disconnector unit
Compensator unit
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Introduction to GILStraight Unit
Typical length of 120 m
Bending radius down to 400 m
120 m
5b 5a 3 4 1 2 4 5b
1 enclosure2 inner conductor3 conical insulator4 support insulator5a male sliding contact5b female sliding contact
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IEEE/PES Substation Committee - GIS Subcommittee
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Introduction to GILAngle Unit
For directional changes
Flexible angle from 4° to 90°1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 support insulator
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IEEE/PES Substation Committee - GIS Subcommittee
1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 support insulator
Introduction to GILDisconnector Unit
Separation of gas compartments
Connection point for sectionalcommissioning of the GIL
Location of the decentralized monitoringunits
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IEEE/PES Substation Committee - GIS Subcommittee
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IEEE/PES Substation Committee - GIS Subcommittee
1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 flexible connector6 compensator bellow
3b 3a1 2 456
Introduction to GILCompensation Unit
Compensation for the thermal expansion of the enclosure
Flexible connectors are leading the current
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IEEE/PES Substation Committee - GIS Subcommittee
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IEEE/PES Substation Committee - GIS Subcommittee
Introduction to GILAdvantages
30 years of experience with gas-insulated systems
High reliability and high safety because of the metallicenclosure
Low operating costs: resistive and capacitive
Practically no ageing because of insulating gas
Very low electromagnetic fields
No external influence in the case of an internal failure(low fire risk)
Operates like an overhead line, with autoreclosure
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IEEE/PES Substation Committee - GIS Subcommittee
Introduction to GILCumulated Length of GIL World-wide
198.00073 to 120037.10072/145/17232.900242/30010.10736263.60042052.650550
1200800
4201200
Cumulated lengthm
UrkV
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B Design Features of GIL
ContentsGIL Basics
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Design Features of GILGIS Tri-Post Support Insulator (Particle Trap)
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Low transmission losses and investment costs
Low electromagnetic fields
High quality automated welding
No external impact due to internal failure.
Design Features of GILFour Examples
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AMVA
0
100
200
300
400
500
600
500 1000 1500 2000 2500
OHL4x240/40 Al/St
W/m
180014001000700350
XLPE Cable2XKLDE2Y1x1600
GIL6000
Comparison of GIL, Overhead Line and Cable
Design Features of GILTransmission Losses
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OHL GIL
Transmission power MW 1400 1400
Losses per system meter W/m 580 180
Losses per 32 system kilometer(20 miles) MW 18.56 5.76
Difference between GIL and OHL MW Δ 12.80
Additional Losses of the OHL per year USD 10,908,000.-
(Energy cost: $0.10/kWh x 8,600 h x 12,800 kW)
Design Features of GILTransmission Losses
Comparison of Overhead Line (OHL) with GIL Cost of Losses
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0
0,5
1
1,5
2
0 500 1000 1500 2000 2500
Cable
GIL
Overheadline
Cost Factor
S [MVA]
1 cable system(natural cooling)
1 cable system (forced cooling)
2 cable systems (forced cooling)
Design Features of GILCost Comparison of 420 kV Cable, OHL and GIL
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Low transmission losses
Low electromagnetic fields
High quality automated welding
No external impact due to internal failure
Design Features of GILExample Two
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IEEE/PES Substation Committee - GIS Subcommittee
Design Features of GILLow Electromagnetic Fields
Rated Current: 2500 A Magnetic Flux Density Calculated GIL and Cable
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Design Features of GILExample Three
Low transmission losses combined with low electro-magnetic fields
Low electromagnetic fields
High quality automated welding
No external impact due to internal failure
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Design Features of GILHigh Quality Automated Welding
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Design Features of GILHigh Quality Automated Welding
Microscopic View of the Weld
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IEEE/PES Substation Committee - GIS Subcommittee
Design Features of GILExample Four
Low transmission losses combined with low electro-magnetic fields
Low electromagnetic fields
High quality automated welding
No external impact due to internal failure
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No external impact
Low pressureincrease
Operation similar to over head lines
View inside the GIL. Test Conditions: 63 kA, 500 ms
Enclosure
Conductor
Design Features of GIL No External Impact Due to Internal Failure
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C Development and Manufacturing
ContentsGIL Basics
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Development and ManufacturingSteps of Development
• 2001 : First Gasmixture GIL of 300 kV installed in Geneva, Switzerland
• 1976 : Delivery of first Directly Buried GIL
• 1974 : Delivery of first 420 kV GIL
• 1968 : Delivery of first GIS
• 1960 : Start of fundamental studies in research and development of SF6-technology
• 1985 : Delivery of 550 KV and 8000 A High Power GIL
more than 5700 km-years of operation
more than 190 km in more than 100 projects installed world-wide
More than 40 years of experience in gas insulated technology
• 2007 : Delivery of first 800 kV, 4000 A GIL
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IEEE/PES Substation Committee - GIS Subcommittee
Development and ManufacturingHigh Voltage Test – 420 kV/3150 A GIL
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Development and ManufacturingShort Circuit Current Test – 63 kA
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D Typical GIL Layout
ContentsGIL Basics
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Two Three Phase SystemsUN = 420/550 kVIN = 3150 ATunnel Diameter 3 m
Typical GIL LayoutArrangement in a Tunnel
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Typical GIL LayoutPrinciple Tunnel Laying Process
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Typical LayoutDirectly Buried (3)
Orbital Welding and Backfill in the Trench
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Typical GIL LayoutPrinciple Tunnel Laying Process
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E Testing
ContentsGIL Basics
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TestingHigh Voltage Testing
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F Installation
ContentsGIL Basics
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Installation and CommissioningShipping and Transportation
Delivery Transport Units
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Corrosion protection on enclosure. Note no special protection fromdirt trench or weather conditions during assembly.
Installation and CommissioningSequences of Erection
Contact System Connection
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Installation and CommissioningSequences of Erection
Shaft Welding Tent in the Tunnel
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Installation and CommissioningSequences of ErectionFlange Connection
No special tools required
No extensive protectionfrom weather or dirt required
Assembly is complete inabout 15 minutes
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Installation and CommissioningOn-Site Testing
Designed to test long lengths of GIL and short lengths of conventional cable.
Variable Frequency High Voltage Test Set
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Thank you for your attentionfor
the GIL Basics Module.