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1 Worldwide experience selected projects
3 Planned projects and conceptual solutions
2 Special requirements for underground S/S
4 Discussion
Presentation Roadmap
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1 Worldwide Experience Selected Projects
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Difficult locations for substations and transformers
S/S in French submarines Metro stationsHydropower stations Offshore wind parks
Sophisticated Projects
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Country: SwitzerlandClient: Stadtwerke St. GallenScope: 5 bays 110 kV GIS type 8DN9
15 bays MV, 24 kV NX Plus
2 x 25 MVA transformers
The substation is located in a stadium.It was a big challenge to coordinate theimplementation of the substation with theongoing work on site.Transformer openings are closed withprefabricated concrete slab, which can beremoved with reasonable effort.
St. Gallen Breitfeld
Switzerland, St. Gallen - Breitfeld
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Country: SwitzerlandClient: Stadtwerke St. GallenScope: 6 bays 110 kV GIS type 8DN9
2 x 40 MVA power transformers
110/10 kV each17 bays MV, 10 kV GIS
The Substation is integrated in a buildingcomplex and installed underground inlevel-3 and level-4. More than 250 t ofmaterials and equipment had to be cranedin to a point 15 m below ground level.In the building above is accommodated abank and the Switzerland institution for
material testing
St. Gallen Schochengasse
Switzerland, St. Gallen - Schochengasse
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Preparations for
offloading a 40 MVA
transformer
Transformer is lifted into
the foreseen opening
Transformer placed on
the rails and ready to be
pulled to final position
Schochengasse 110/10 kV SubstationProject Execution - Heavy Equipment Installation
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PavingPaving
Schochengasse 110/10 kV SubstationClosing Transformer Opening Outside
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ceiling
Removable slabRemovable slab
Schochengasse 110/10 kV SubstationClosing Transformer Opening Inside
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Data protection
Faraday Cage
People protection
Schochengasse 110/10 kV Substation EMIProtection
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Solutions Water CO2 Halon
Nitrogen Inergen
Schochengasse 110/10 kV SubstationTransformer - Fire Extinguishing System
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Fire Safe
Schochengasse 110/10 kV SubstationTransformer Separated
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Activation controlfrom the entrancefour floors higher
Activation controlfrom the entrancefour floors higher
Schochengasse 110/10 kV SubstationSmoke Extraction System
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Exhaust airExhaust air
EmergencyexitEmergencyexit
LadderLadder
Schochengasse 110/10 kV SubstationUtility Shafts and Emergency Exit
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Drainage systemin cable basement
Schochengasse 110/10 kV SubstationSprinkler System in Cable Basement
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Fresh air below transformer Fresh air under the ceiling
Schochengasse 110/10 kV SubstationHVAC Dust Protection
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Increased safetyIncreased safety
Schochengasse 110/10 kV SubstationTransformer - Encapsulated Termination
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Country: SwitzerlandClient: Stadtwerke Winterthur
The location is between school playground
and a motorway about 4m above. Thesubstation is used to equalize the heightdifference and to detain the noise from thecars.
The 2 storey building with cable basementhas an even access for transformers. Theother side is covered by the rising plot.
110/20 kV Substation -Wlflingen
Switzerland, Winterthur - Wlfingen
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WlfingenGround Plan
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Sound absorber
WlfingenNoise Limits Outside
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WlfingenPlayground Outside the Substation
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Side effect:heating systemcools transformer
WlfingenTransformer Cooling Devices
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WlfingenControl Room Special Design
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WlfingenIntuitive Guiding
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Country: AustraliaClient: TransGridScope: 25 x bays GIS type 8DN8/145 kV
4 x bays GIS type 8DQ1/362 kV330/132 kV transformer
The substation is integrated in a buildingcomplex in Sydney and is installed across2 above ground and 3 basement floorlevels
110/330 kV Substation -Haymarket
Australia, Sydney - Haymarket
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Haymarket 110/330 kV SubstationProject Execution - Deep Excavation
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app. 10 m,2 storey design
above ground
app. 22 m3 storey designbelow ground
foot print app. 30x60 m
Haymarket 110/330 kV Substation
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Haymarket 110/330 kV SubstationMain Equipment @ Basement 2
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Haymarket 110/330 kV SubstationSubstation Model
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Substation control & metering room
cable and auxiliary supply basementwith SF6 collection plenum
110 kV GIS 8DN8:25 bays (15 cable feeders),double bus bar
330 kV GIS totransformerconnection:GIB, 100% SF6 gas
Gas insulated transformer:330 kV 400 MVA SF6 single phasetransformers, no. 3 transformers intotal
330 kV GIS 8DQ1:4 bays, ring bus bar
Haymarket 110/330 kV SubstationArrangement of Equipment
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Floor Plan Basement 2 (Equipment Floor)
Haymarket 110/330 kV SubstationSF6 Gas Management
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Secondary SF6 plenum
Floor Plan Basement 3 (Cable Basement and SF6 Plenum)
Primary SF6 plenum
Haymarket 110/330 kV SubstationSF6 Gas Management
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Mainly under grounded substation in an urban environment
Main electrical equipment with gaseous insulation, thusavoiding fire hazards
Compactness due to latest GIS technology
Sophisticated SF6 gas monitoring with slow and fast gas leakdetection
Integrated control system enabling unmanned substationoperation
Haymarket 110/330 kV SubstationKey Features
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Country: MexicoClient: CFEScope: 6 x bays GIS type 8DN9
2 x power transformer 100 MVA
Substation in a park in the middle ofcommercial district.
Access ramp, AC openings and stairs arehidden behind landscaping.
132 kV SubstationFaro - Monterrey
Mexico, Monterrey - Faro
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Country: USAClient: City of Anaheim CAScope: 8 x bays GIS Type 8DN9 / 69 kV
2 x 69/12 kV 50 MVA
transformers20 x 12 kV panels
69/12 kV Park SubstationCity of Anaheim
United States, City of Anaheim Park Substation
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Park SubstationCovered by the Roosevelt Park
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Park SubstationS/S Entrance Design
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Park SubstationS/S Emergency Exit
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Country: SpainClient: CFEScope: 245KV, GIS 12 bays 8DN9
One of three Siemens undergroundsubstations in multistory buildings inMadrid.
Access via crane and open able duct
245 kV SubstationManuel Becerra
Spain, Madrid Manuela Becerra
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Country: SwitzerlandClient: Stadtwerke Winterthur
Underground substation under a
schoolyard in Winterthur.
Started May 2008
110/10 kV SubstationToessfeld
Switzerland, Winterthur - Toessfeld
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ToessfeldSection View of the Fully Undergrounded Substation
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ToessfeldSection View
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Less effort withsingle storeyundergroundbuildings.
Ongoing project inSwitzerland:Monitored withWebcam
ShoringShoring
SlopeSlope
ToessfeldSite Mobilization and Supervision
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2 Special requirements for underground S/S
1. Soil + Ground Water
2. Fire Fighting
3. HVAC
4. Emissions
5. Access
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Ground water tableSoil pressure
Crucial for design andcost
Soil and Ground Water
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/$
Ground WaterCost Impact
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Passive Fire Fighting
No flammable material.
2 separated ventilationsystems for transformersand building
Active Fire Fighting
Fire extinguish system
HSE Regulations
Emergency exit
No toxic materials (PVC)
Fire Protection ConceptFire Fighting
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Ventilation
Transformer separated fromother devices.
More space needed.
Humidity Avoid humidity by minimizing
air exchange
HVAC
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Noise
Inconvenient sound of HVAC-units and transformers
Electromagnetic
Too small vertical clearance topublic places or EDP
Emmissions
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Heavy Equipment
If possible transformers onground floor
Aesthetic
Architectural design ofvisible parts
Access
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3 Planned Projects and Conceptual Solutions
Planned Projects and Conceptual Solutions
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Section 1
Conceptual Solution Semi Underground
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Section 2
Conceptual Solution Semi Underground
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If the space between ground surface and water table is limited, the cable basement can be avoided.
Sample: U/G S/S Round House West Area P1,Toronto Hydro/Canada
Cable Basement & Cable Entry
Sample: Chorzow S/S, Poland
HV cables in horizontal position terminated
LV cables in cable tray above LCC cubicels
LV cable entry to LCC cubicles from the top
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In construction and technical design
8DN8-72.5 kV corresponds to switchgear
8DN8-145 kV, but is smaller
Bay Width: 800 mm
Conventional air-isolated type
How to cope with the problem of limited space?
Nx+C (11 kV GIS)
Use equipment with reduced space requirements
8DN8-72.5 (66 kV GIS)
Bay Width: 640 mm
Conceptual Solutions 66/11 kV GIS
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3 Possible Layouts
Underground S/S
Semi underground S/S
On top building
Hide as much as possible
2 levelsDesign necessary
Design Concept
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Possible Urban Situation
Substation surrounded by buildings
Park area, trees, plants, green
City square, plaza or parking area
Urban Situation Architectural Concept
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Design Solution on Top of Public Squares
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Waterfall Entrance
In park design water isan essential element.
HVAC - Acoustic Solutions for Parks and Sqares
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Cost impact (underground S/S in relation to conventional S/S)
Conventional S/S Underground S/S
12%100%Total costs
010lot1Services (design, installation and testing)
3407lot1Mechanical, electrical, plumbing (MEP) works
22lot1Landscaping
42517lot1Civil & structural works
33lot1Excavation
02lot1Earthing and lightning protection
08lot1LV cables and cable routing
016lot1SCS & CRP
06lot1LV service equipment
02lot1HV cables 66 & 11 kV c/w acc.
015Nos3Transformer 40 MVA and NER
04bays2811 kV switchgear
014bays1366 kV DBB GIS
TotalCosts of new items
in %Additionalcosts in %
%
Commercial Aspects (Preliminary Approach)
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Estimated execution time: 20 months per substation (subject to transformer delivery)
Project Execution Schedule
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Thank you foryour attention !