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

7

• Jun. 2009
• Mar. 2010
• Dec. 2010

First public hearing Second public hearing Detail design and Negotiation with land

• wners

EIA-permission

• Oct. 2010
• Apr. 2011
• Feb. 2013
• Jun. 2015

Start of construction work Substations Start of Construction work OHL Commissioning Kassø-Revsing

• Nov. 2014
• Dec. 2013

Commissioning Revsing-Askær Commissioning Askær-Tjele Dismantling of existing line Dismantling of existing line Detail design and location of towers

• Jan. 2012

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

12

409 suspensions towers 67 running angle towers 22 tension angle towers

Towers in new design

18 tension towers (dead end)

13

OHL

Insulators

• Composite-insulators

Phase conductors

• AAAC 925 mm2 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 mm2 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