Case Studies
Compact Transmission Solutions for Grid Expansion and Uprating
Project Description
Project located in the coastal area with serious corrosion, experiencing at least two typhoons every year.
Design Condition
Pollution level : class e
Wind speed: V=30 m/s
Ice cover : C=10 mm
Benefits
Layer spacing compressed from 6.2m to 5.5m
Corridor width reduced by 2 m
Steel consumption of the whole tower reduced by 10%
Engineering Application
Commissioning Date: 2009
Number of CICA Towers: 1
Project Description
The world's first application of CICA towers in 750kV ultra-high voltage line project.
Design conditions
Elevation: 1500m
Pollution Level: class d
Maximum design wind speed: V=31m/s
Ice thickness: C = 5mm
Benefits
Nominal height reduced: 5m
Tower material saved: 10t •Corridor width reduced: 13m
Base concrete saved: 10m³
Engineering application
Commissioning Date: 2013
Number of CICA Towers: 7 (3.15km)
Project Description
The world's first application of CICA towers in ±800 kV UHVDC transmission line project.
Design conditions
Maximum design wind speed: V=27m/s
Ice thickness: C=10mm
Benefit
Tower material saved: 9.5t
Nominal height reduced: 9m
Base concrete saved: 16.7㎡
Engineering application
Commissioning Date: China, 2015
Number of CICA Towers: 2 (1 km)
Project Description
The world's first application of CICA towers in 1000kV UHVAC transmission line project.
Design condition
Elevation: 1500m
Pollution level: class d
Maximum design wind speed: 30m/s
Ice thickness: 10mm
Benefit
Nominal height reduced: 8m (15%)
Tower material saved: 6.8t (12.2%)
Corridor width saved: 22m (35%)
Base concrete saved: 20%
Project Application
Commissioning time: China, 2016
Number of CICA Towers: 2 (1 km)
Description
The first application of CICA towers in the position change towers of UHV transmission lines.
Design conditions
Elevation height: <1500m
Pollution level: class e
Maximum design wind speed: 30m/s
Ice thickness: 5mm
Benefit
Nominal height reduced: 5m
Tower material saved: 10t
Corridor width saved: 13m
Base concrete saved: 10m³
Project Application
Commissioning time: 2018
Number of CICA Towers: 14+3 (8 km)
Project Description
The first 500kV transmission line project using CICA tower in China.
Design Condition
Altitude: 1500 m
Pollution level : class c
Wind speed: V=27 m/s
Ice cover : C=10 mm
Benefits
Tower material saved : 2.08 t
Corridor width reduced : 13.4 m
Foundation concrete saves : 2.43 m³
Engineering Application
Commissioning Date: 2019
Number of CICA Towers: 3 (1.5km)
Project Description
The first 500kV transmission line project using CICA cat-head tower in China.
Design Condition
Altitude: 1000 m
Pollution level : class d
Wind speed: V=29 m/s
Ice cover : C=5 mm
Benefits
Side phase: eliminating the wind tripping;
Middle phase: eliminating wind bias tripping.
Engineering Application
Commissioning Date: 2021
Number of CICA Tower: 1
Project Description
First EPC project, responsible for Engineering & Design, Procurement, Construction & Site Management, and Integrated Project Management.
The total length of the project line is 11.65 km, with a coastal distance of less than 1 km. The line passes through an industrial park, has a contamination level of Class e, and the coastal area experiences typhoons 2-3 times annually. Traditional lines are costly and face reliability challenges.
Design Condition
Pollution level : class e
Ice cover : C=5 mm
Benefits (Total)
RoW corridor reduction of 2m: 16%
Tower steel reduction of 135 tons: 18%
Foundation cement reduction of 28 tons: 5%
Foundation steel rebar reduction of 4.5 tons: 5%
Embodied carbon reduction of 500 ton: 13%
Construction man-power and time reduction: 5%
Engineering Application
Commissioning Place & Date: China, 2021
Number of CICA Towers: 16+2 (11.65 km)
Project Description
The total line length of the project is 1.3 km, consisting of 100 m of cable and 1.2 km of overhead lines. The project includes 12 towers and is designed as a multi-circuit hybrid-voltage transmission line. Given the high land cost in the development zone, every square meter of land saved provides greater flexibility for the park's future development.
Design Condition
Pollution level : class d
Ice cover : C=10 mm
Benefits (Total)
The only solution for integrating 10kV distribution networks with 35kV and 110kV main transmission grids.
Engineering Application
Commissioning Date: 2021
Number of CICA Towers: 12 (1.3 km)
Project Description
The project design has a basic wind speed of up to 32 m/s. Traditional transmission towers pose reliability risks such as wind-induced flashover, and require consideration of minimum corridor width to minimize damage to trees and grasslands.
Design Condition
Altitude: 600-1100 m
Pollution level : class e
Wind speed: V=32 m/s
Ice cover : C=10 mm
Benefits
Tower material saved: 3.5 t
Corridor width reduced : 6 m
Foundation concrete saved: 5 %
Engineering Application
Commissioning Date: 2022
Number of CICA Towers: 29
Project Description
This project is the world's first 110kV transmission line project utilizing CICA for all suspension towers, tension towers, and angle towers, except for cable terminal towers. It also represents the world's first demonstration project employing CICA tension towers.
Design Condition
Altitude: 1000m
Pollution level : D
Wind speed: V=31m/s
Ice cover : C=10mm
Benefits
Tower height reduced: 0.5 m
Corridor width reduced: 2 m
Engineering Application
Commissioning Date: 2022
Number of CICA Towers: 6 (Suspension)+10 (Tension)+1 (Angle) (2.8 km)
Project Description
The world's first 500kV CICA tower with tension and transposition functions.
Design Condition
Altitude: 1000m
Pollution level : class C
Wind speed: V=27m/s
Ice cover : C=10mm
Benefits
The 500kV CICA tower, incorporating both tension-resistant and transposition functions.
Engineering Application
Commissioning Date: 2022
Number of CICA Tower: 1
Project Description
The world's first 750kV CICA tower featuring a lightweight structure.
Design conditions
Elevation height: <1500m
Pollution level: E
Maximum design wind speed: 30m/s
Ice thickness: C=5mm
Benefit
Nominal height reduced: 5m
Tower material saved: 10t
Corridor width saved: 14m
Base concrete saved: 10m³
Project Application
Commissioning time: 2024
Number of CICA Towers: 13 (6 km)
Project Description
400kV diamond-shaped CICA towers, used in the Hinckley nuclear power transmission project in UK(Project involves suspension, tension, and angle towers). Additionally, the project must fulfill aesthetic requirements, including public acceptance and recognition.
Benefits
ROW land reduction
Crop compensation reduction
First design change in UK in 100 years
Radically improved aesthetics
Engineering Application
Commissioning Place & Date: UK, 2021
Number of CICA Towers: 84
Project Description
During the construction of the 220kV MC Trombay to Salsette transmission line by Tata Power in India, the route passes through 10 critical zones within aviation areas where tower heights must be strictly restricted. Additionally, as the line crosses densely populated regions, the project poses significant challenges regarding the height of suspension towers and tension towers, as well as the corridor width of the transmission line.
Design Condition
Altitude: ＜ 1000 m
Pollution level : class e
Wind speed: V=44 m/s
Benefits
The CICA tower resolved the height restriction issue.
ROW land reduction
Crop compensation reduction
Engineering Application
Commissioning Place & Date: India (TATA), 2022
Number of CICA Towers: 6 (tangent)+2 (tension)