Successful Development & Implementation of the 400kV Eagle - PowerPoint PPT Presentation

Successful Development & Implementation of the 400kV Eagle Transmission Line Pylon SEBASTIAN DOLLERUP

Successful development and implementation of the Eagle transmission line pylon 400kV OHL Kassø-Tjele Sebastian Dollerup – Head of Transmissions Lines, Energinet.dk 1

Agenda Why this project • Facts about the project • Approach and design • Towers in new design • Substation in new design • Sub contractors • Economy • Experiences • 2

Why To incorporate renewable • Energy To ensure a well functioning • electricity market To ensure the foundation to • underground all OHL below 400kV 3

The project 166 km 400 kilovolt overhead line from • Kassø to Tjele Towers ”in new design” • Along existing line • Existing line will be removed • New substation at Vejen (indoor GIS) • Expansion of substations Kassø, Askær and • Tjele Three cable sections (2.5, 4.5 og 1.6 km) • Six cable transition stations • 4

Overall approach Political support to the project • Permission from the authorities • Permission in relation to ”Law about Energinet.dk” (the Minister) • Permission in relation to ”The Planning Act” (Danish Nature Agency ) • Purchase of components (towers, conductors, insulators, cables, reactors, • GIS, circuit breakers etc.) Contracts with contractors (installation of towers, conductors, cables, high • voltage equipment, buildings etc.) Negotiations with land owners (compensations, purchase and sale of homes) • Dispensations from local authorities (as special areas of nature ) • Construction work • Commissioning • 5

Design process Involve the public and the authorities • Avoid that the new HVAC line is close to buildings • Reduce noise • Visual impact • Towers in new design Dismantling existing line Restructuring 60kV lines along route Think out of the box • 6

Time line Jun. 2009 Mar. 2010 Oct. 2010 Dec. 2010 First Second public Detail design EIA-permission public hearing hearing and location of Detail design and towers Negotiation with land owners Apr. 2011 Jan. 2012 Feb. 2013 Dec. 2013 Nov. 2014 Jun. 2015 Start of Start of Commissioning Commissioning Commissioning construction Construction work Kassø-Revsing Revsing-Askær Askær-Tjele work Substations OHL Dismantling of Dismantling of existing line existing line 7

Towers in new design Bystrup Architects and Designers • Not lattice towers • Reduce visual impact in landscape • Accepted by land owners and neighbours • Robust and durable • Not too expensive • Different types but same family • 8

Towers in new design 9

Towers in new design 10

Towers in new design 11

Towers in new design 22 tension angle towers 67 running angle towers 409 suspensions towers 12

Towers in new design 18 tension towers (dead end) 13

OHL Insulators Composite-insulators • Phase conductors AAAC 925 mm 2 Al • Earth conductors Dorking • OPGW • Triple (three conductors in each phase) 14

Substation in new design New 400 kV substation Revsing • Indoor • GIS Extra bay in substation Kassø and Tjele Reactor in Kassø, Tjele, Askær and Revsing 6 cable to overhead line transition stations • Compact • Optic current transformers 15

Cable sections 2x2x3 – 2000 mm 2 Al cables • 2.5 – 4.5 – 1.6 km • 2x2 subsystems • 4 cable trenches • Directional drillings under roads and streams • Crossing Bølling Sø (lake) • 16

Division into sub Contractors Towers Design • Detail design • Production • Agreements with land owners and compensation for damage to crops Geotechnical studies Initial and preliminary work (ground levelling, groundwater lowering etc.) Steel plates Concrete foundations Monopile, production Monopile, driving 17

Division into sub Contractors Installation of towers Conductors, insulators, fittings etc. Delivery of phase- and earth-conductors • Delivery of OPGW • Delivery of insulators, clamps • Delivery of dampers, spacers • Installation of insulators, conductors, fittings etc. • Supervisors and workers from more companies • Training of new staff • Frame agreement about work on overhead lines • Preparedness • Dismantling of old foundations 18

Economy Final Budget • Planning 3,7 mill. EUR 2,3 mill. EUR • Compensation 54,8 mill. EUR 56,5 mill. EUR • Design of new tower 1,5 mill. EUR 1,5 mill. EUR • Main project (restructuring) 25,5 mill. EUR 26,9 mill. EUR • Substations 43,7 mill. EUR 37,5 mill. EUR • Overhead line 165,2 mill. EUR 184 mill. EUR • Underground cables 30,1 mill. EUR 38,4 mill. EUR • Risks and uncertainty 0 mill. EUR 18 mill. EUR • Interest (incl. interest correction) 8,9 mill. EUR 28,7 mill. EUR • Dismantling 5,5 mill. EUR • Total 339 mill. EUR 394 mill. EUR 19

Experiences The new line is well accepted by most neighbors, experts, • contractors and by the owner Important to be open and in dialog with the public and authorities • and listening to comments and input The new design tower has shown that it is possible to re-think the • design and the general approach to overhead lines - and to receive positive feedback The costs of the new towers are higher than the costs of lattice • towers. The benefit is a better-looking line with reduced visual impact of the environment 20