Gas Insulated Substation Presentation

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IEEE/PES Substation Committee - GIS Subcommittee

T&D Chicago GIS


Substations CommitteeGIS Subcommittee K2

ModuleGas Insulated Substation (GIS)

Basics

IEEE

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T&D Chicago GIS


ContentsGIS Basics

A Introduction to GISC Design Features of GIS

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T&D Chicago GIS


ContentsGIS Basics

A Introduction to GIS

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Introduction to GISTypical Air Insulated Substation 345/230/115kV

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Introduction to GISTypical Gas Insulated Substation 345/115kV

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Introduction to GISCable Feeder Unit

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Introduction to GISDimension ComparisonGIS Technology

SF6 used as the insulating media

Reduced clearances- 345 kV AIS 4.6 m (15 feet)- 345 kV GIS 380 mm (15 inches)

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Introduction to GISView into Bus Bar: Conductor/Enclosure Dimension

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Busbar DisconnectorCurrent TransformerCircuit Breaker

CableConnection

DisconnectorCurrent TransformerCircuit Breaker

Introduction to GISClassic Single Phase Enclosure of GIS

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Introduction to GISMidway Sunset Sunoco Cogen 242 kV GIS

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242 kV

2000 A

40 kA

No. of breakers

Rated voltage

Rated current

Rated short-circuit current

1988Supply year

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T&D Chicago GIS


Introduction to GISClassic Three Phase Enclosure of 72.5 to 170 kV GIS

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Introduction to GISAdvanced Three Phase GIS 72.5 to 145 kV

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Introduction to GISAdvanced Three Phase GIS 72.5 to 145 kV

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ContentsGIS Basics

B Design Features of GIS

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Design Features

GIS technology: compact, low-life cycle cost andmodular for indoor and outdoor applications

Modular design, factory pre-assembled and tested units

Space requirement less than 20 % of comparable AIS

Safety (enclosed energized components)

Continous monitoring of SF6 densitity

Sealed for operating life > 50 years

Major inspection: not before 25 years 1)

1) Is influenced by the operation duties

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Design Features

GIS technology: compact, low-life cycle cost andmodular for indoor and outdoor applications

Corrosion-resistant

Low fault-probability/high availability

Protected against aggressive environmental conditions

Seismic resistant

Low EMF and susceptibility to EMC

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Design FeaturesSpace Savings

Space Reductionappr. 70 %

Previous

Afterwards

Retrofit of an existing AIS Substation byCompact Substation

145 kV/31,5 kA 4000 A

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Design FeaturesModular Structure (schematic)

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Design FeaturesModular Structure (devices)

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Design FeaturesGIS Pressure Systems

Closed pressure systems:

The closed pressure system uses isolated apparatus compartments with o-ring sealed bolted flanges.

The tightness characteristic of a closed pressure system stated by the manufacturer shall be consistent with a minimum maintenance and inspection philosophy.

The leakage rate from any single compartment of GIS to atmosphere and between compartments shall not exceed 0.5 % per year for the service life of the equipment.*

Practical experiences to the today’s design of GIS show as low as 0.2 % per year.

* IEC 62271-203 Gas Insulated Switchgear for voltages above 52 kV

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Sealant

O-Ring

Insulating Spacer

Air Side

SF6 Gas Side

Flange

■ O-RING

■ LIQUID SILICONE SEALANT

GAS SEALING

PROTECTION AGAINSTGISEnclosure

� WATER INGRESS FROM AIR SIDE

� RUST OF FLANGE

Design FeaturesExample for Static Double Sealing System

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Design FeaturesExample for Corrosion Protection

– – – Tectyl 506 coating for external area A- - - - Trost Multifunction Oil coating for inner area B

Grease bolts with “Molykote Longterm 2”before inserting

gap protection by seal coating

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Design FeaturesExample for Dynamic Sealing System

Coupling of operating rodSF6 gas compartmentSF6 gas compartment

Coupling of operating rod

Shaft SF6 seal Operating lever

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Design FeaturesTypical Grounding / Earthing Arrangement of GIS

Earthing of the buildingConnection to GIS bayOutside the buildingEarthing in the floor/ceilingConnection earthing of floor/ceiling to building

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Thank you for your attention.

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Gas Insulated Substation Presentation

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