INNOVATIVE SOLUTIONS FOR OVERHEAD LINE SUPPORTS OHL TOWERS INTO ARTWORKS

Transcription

1 INNOVATIVE SOLUTIONS FOR OVERHEAD LINE SUPPORTS OHL TOWERS INTO ARTWORKS 01 of 27

2 1 - INTRODUCTION Some time ago - Towers were not pretty nor ugly - Just essential Big changes mainly after 60 s: - Thousands of OHL kms constructed - Electricity: from a privilege to a social acquired right, an obligation of the governments. - Presence of OH Lines in urban/rural areas. - Difficulty in obtaining new corridors - Growth in environmental conscience. 02 of 27

3 2 - EVOLUTIONS ON THE SOLUTIONS 2.1 First Aesthetic Studies H. Dreyfuss & Associates, of 27

4 H.Dreyfuss Pictorial Index 04 of 27

5 H.Dreyfuss Proposal 1 H.Dreyfuss Proposal 2 05 of 27

6 2.2 Cigré Studies Congreso Bienal Internacional CIGRE Technical Brochure SC22 WG02: The Environmental Impacts of High-Voltage Overhead Transmission Lines Da Silva s Research in Architecture School. Da Silva s Survey 1999 SC22 WG14 Technical Brochure: High Voltage Overhead Lines Environmental Concerns, Procedures, Impacts and Mitigations. 06 of 27

7 2.3 First Initiatives Congreso Bienal Internacional CIGRE 2009 Compact as much as possible Reduced number of elements Transparent, invisible or camouflaged Monopole Support Brazil Portal Guyed Sweden Invisible Cross rope Argentina 07 of 27

8 3 THE MONOPOLE SUPPORT The most used aesthetic solution Why? Simplicity, elegance, beauty, slenderness, low visual impact, reduced area for settlement. Pole Characteristics/Details SQUARE HEXAGONAL OCTAGONAL DODECAGONAL CIRCULAR Pole Cross-Sections & Joints Overlapping Flanged 08 of 27

9 Pole Characteristics/Details Nuts for adjusting Anchor bolt templates DIRECTLY EMBEDMENT WITH DENSED SAND BOX FLANGED BASE PLATE Typical Pole Foundation Type Details 09 of 27

10 Structural Characteristics - Very flexible structures - Non linear structural analyses - Poles top deformations: At EDS: 1.5 to 2% height (H) Ultimate stage: 4 to 5% H Pole deflections during Tests 10 of 27

11 4 THE NEW CIGRE STUDIES New Study Committee B2: Overhead Lines Working Group WG08: Transmission Line Structures Task Force: TF3.1 Innovative Solution for Overhead Line Supports Period: Congreso Bienal Internacional CIGRE 2009 Convenor: João BGF Silva BR Secretary: David Hughes/UK; F.Legeron Canadá Questionnaire: Aesthetic solutions around the world. 11 of 27

12 4 THE NEW CIGRE STUDIES Australia Brazil Canada Denmark Finland France Iceland Italy Japan Norway Romania South Africa Spain Sweden Switzerland United Kingdom United States 17 Countries CIGRÉ WGB2.08 TF3.1 Data Bank Electra Journal Report = delivered for publication: 2010 Cigré Technical Brochure 12 of 27

13 5 ADVANCED AESTHETIC SOLUTIONS Unique solutions / For specific places Solutions for a line / or segment Standard aesthetic solutions 5.1 Solutions for Single Places: The Finnish Experience Fingrid first landscape towers: early 90 s Finnish Solutions 13 of 27

14 5.2 Solutions for Lines / Segment of Lines 400kV OHL Aarhus / Aalborg-Denmark Eltra competition: 48 proposals Danish Aesthetic Line The Wining entry Erik Bystrup 14 of 27

15 5.2 Solutions for Lines / Segment of Lines The 110kV Salmisaari-Meilahti TL, Helsinki, Finland Designed by Prof. Antti Nurmesniemi The Salmisaari Meilahti OHL First pencil drawings 15 of 27

16 5.3 Standard Aesthetic Solutions: The French Experience EDF / RTE Competitions - The 1994 Architects/Designers competition - The 2004/2005 Manufacturers competition The 1994 Architects/Designers competition: proposals for 400kV OHL supports - As much freedom as possible to the creativity - Electrical clearances, phase arrangements 16 of 27

17 The ROSEAU Tower The winners The FOUGERE Tower Marc MIMRAM I. Ritchie, K. Gustafson The French Experience 17 of 27

18 The 2004/2005 Manufacturers competition: - Functional specifications defining: Position of phases Number of circuits Silhouette suggestion Materials to be used To have technical solutions The winner: The ARVERNE Tower Transel, Linuhonnun 18 of 28

19 6 OH LINE TOWERS INTO ARTWORKS Aesthetic towers very successful in terms of public acceptance. Towers evolving from OHL Supports to urban electrical sculptures. Finnish Sculptures Fingrid landscape towers Finnish Sculptures 19 of 27

20 Icelandic Studies 2008 landscape competition (98 proposals). Icelandic Studies 20 of 27

21 New RTE Technique for Improving OHL Appearance - Art Installations over existing OH Lines. - Power Networks into Artworks by Elena Paroucheva Networks into Artworks 21 of 27

22 7 - ANALYSIS OF THE SOLUTIONS Increasing environmental concern in all new OHL projects: - Short lines, long lines - Urban, rural landscapes For long / rural lines, cost is an absolutely relevant issue: - Invisibility - Transparence - Slenderness - Compaction - Camouflaged structures 22 of 27

23 All together driven by cost! Solutions for long OHL Towers 23 of 27

24 For short / urban lines, aesthetic towers more and more used as attractive solutions: Vaasa, Palosaari. Jorma Valkama 1992 Seville Expo Tower - Spain 24 of 27

25 Symbolic links with icones of the societies: - Architeture - History - Culture - Traditional symbols - Folklore - habits Symbolism on Aesthetic Towers 25 of 27

26 8 CONCLUSIONS - Great growth on electricity demand will continue in the near future. - Different challenges for utilities in different regions of the world to supply more power. - Long, very long lines (up to 2500km) under construction in the world Aesthetic solutions driven by cost. 26 of 27

27 - Other regions of the world, environmental is the real issue. Alternative solutions, visually attractive landscape towers. Camouflaged lines, underground cables, or lines with more aesthetic, more beautiful towers! 27 of 27