IEEEewh.ieee.org/conf/tdc/C_08TD0790-GIL-Basiscs-2008-04-15...2008/04/15 · IEEE/PES Substation Committee - GIS Subcommittee T&D Chicago GIL Introduction to GIL Cumulated Length

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IEEE/PES Substation Committee - GIS Subcommittee

T&D Chicago GIL


Substations CommitteeSubcommittee K0Working Group K2

ModuleGas Insulated Transmission Line (GIL)

Basics

IEEE

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T&D Chicago GIL


A Introduction to GILB Design Features of GILC Development and ManufacturingD Typical GIL LayoutE TestingF Installation

ContentsGIL Basics

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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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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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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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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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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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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



No external impact due to internal failure

Design Features of GILExample Two

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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




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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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Design Features of GILExample Four

Low transmission losses combined with low electro-magnetic fields




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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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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.

Documents

IEEEewh.ieee.org/conf/tdc/C_08TD0790-GIL-Basiscs-2008-04-15...2008/04/15 · IEEE/PES Substation Committee - GIS Subcommittee T&D Chicago GIL Introduction to GIL Cumulated Length