elstree to st john’s wood 400 kv cable tunnel - t3-02 - … · 400 kv cable tunnel professor...
TRANSCRIPT
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University ofSouthampton
Elstree to St John’s Wood 400 kV Cable Tunnel
Professor Steve Swingler
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System Overlay Philosophy
275 kV system is over 40 years oldNew build to be at 400 kVMinimise public impactMinimise disruption to existing system during construction
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St John’s Wood: Aerial Shot
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Construction Issues: Substations
SpaceSite accessTraffic managementSite clearanceConstruction worksImpact on local communityArchitecture
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Why Dig a Tunnel?
Reduced public disruption during constructionReduced programme risk Secure environment for cableFuture provision for second circuit
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The Tunnel Route
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Technical Details
400kV XLPE cable circuit2500 mm2 Copper conductorForced air coolingDTS monitoring and controlPD Couplers installed in accessoriesSingle circuit
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The Tunnel
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Construction Issues: Tunnel Shaft Sites
Site availabilitySite accessTraffic managementSpoil removalImpact on local communityHeadworks
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Kilburn Grange Park:Aerial Shot
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Kilburn Grange Park:Headhouse and New Entrance
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Tunnel Layout
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Consultations and Communications Strategy
Introductory open meetingsOngoing discussion forumsFreephone serviceProgramme updatesAdvertsLocal community support
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Project Identity
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London Infrastructure Project: Summary
System installed and operatingCommissioning test from ElstreePD measurements during testMajor consultation exercise