Case Studies
Compact Transmission Solutions for Grid Expansion and Uprating
Project Description
Multiple wind deflection have occurred since commissioning in 2000.Even through various anti-wind deflection methods, the wind deflections have not been completely reduced.
Design Condition
Pollution level : class e
Wind speed: V=31 m/s
Ice cover : C=5 mm
Benefits
After applying the composite cross-arm retrofit solution in 2016, all 59 towers completely solved the risk of wind-flashover.
Engineering Application
Commissioning Place & Date: 2016
Number of CICA Towers: 59 (30 km)
Project Description
The project area is characterized by dense vegetation and a large bird population, presenting issues such as insufficient ground clearance for the conductors, risks of bird feces flashover, and a constrained width of the line corridor.
Design Condition
Altitude: 2400 m (110kV) 2480 m (220kV);
Pollution level : class c
Wind speed: V=25 m/s (110kV) V=30 m/s (220kV)；
Ice cover : C=5 mm(110kV) C=10 mm (220kV)；
Benefits
Corridor width reduced :1.2 m for 110kV project
Corridor width reduced :1.6 m for 220kV project
Engineering Application
Commissioning Date : 2018
Number of CICA Towers: 5+2
Project Description
In this transmission line, due to the presence of certain buildings and trees, some towers face issues with insufficient clearance between the conductors and the ground.
Design Condition
Pollution level : class e
Wind speed: V=44 m/s
Benefits
Corridor width reduced : 4.1 m (13%)
Increase the ground clearance:2 m
increase sag point to ground distance : 2.6 m (37%)
Engineering Application
Commissioning Place & Date: India, 2019
Number of CICA Towers: 2
Project Description
The existing 132kV S/C Panchram - Srikona transmission line crosses the Barak River, which has a flow width of approximately 300 meters and is also known as a "navigable river." According to information from AEGCL authorities, Tower No. 11 of this line collapsed during severe flooding in 2018, after which the line ceased operation.
Design Condition
Pollution level : class e
Wind speed: V=55 m/s
Benefits
Reducing line modification costs
Enhancing operational stability of the line
Improving clearance
Engineering Application
Commissioning Place & Date: India, 2021
Number of CICA Towers: 2
Project Description
The Canadian company Altalink needed to increase the ground clearance of its 240kV double-circuit lattice tower to resolve land occupation issues. EMAGE replaced the traditional angle steel crossarm with a CICA structure, thereby addressing the insufficient conductor height above ground.
Design Condition
Wind speed: V=40 m/s
Ice cover : C=10 mm
Benefits
Increase the ground clearance : 2.2 m
The retrofitted CICA connects to the original tower at the exact same positions as the original steel crossarm, largely preserving the existing structural load-bearing mechanism and minimizing modifications to the current structure.
Engineering Application
Commissioning Place & Date: Canada , 2021
Number of CICA Towers: 1
Project Description
300MW Solar PV Plant 220kV Grid Connection Project (from AEPL Solar Plant to PGCIL Substation), with key client requirements including enhancing the stability of the transmission line, reducing the overall BOQ and initial capital cost, and achieving lower lifecycle costs.
EMAGE ultimately defeated five other EPC competitors with a bid of approximately 17.8 million and secured its first EPC project in India.
Design Condition
Altitude: ＜ 500 m
Pollution level : class d
Wind speed: V=47 m/s
Benefits
Increase the ground clearance : 2 m
ROW land reduction
Crop compensation reduction
Reduction in overall project cost
Engineering Application
Commissioning Place & Date: India (Avaada), 2021
Number of CICA Towers: 35
Project Description
The new 220/400kV multi-circuit transmission line runs parallel to an existing 220kV double-circuit line, resulting in a constrained corridor width for the new 220/400kV M/C line.
Design Condition
Pollution level : class e
Wind speed: V=44 m/s
Benefits
Increase the ground clearance : 2 m
Reduced ROW requirement : 3 m (by installing CICA on one side only)
Reduced BOQ and ROW costs for the new line.
Effectively increased power transmission capacity.
Engineering Application
Commissioning Place & Date: India (Adani), 2022
Number of CICA Towers: 3
Project Description
Transelec, Chile's largest grid company, encountered insufficient ground clearance of the conductor on the lowest crossarm during the construction of a 500kV transmission line.Additionally, since this line serves as a critical transmission line for the region, the retrofit work had to be carried out while the line remained energized, posing significant challenges to the project.
Benefits
Increase the ground clearance : 2 m
Effectively resolved the issue of insufficient ground clearance
Successfully completed live retrofit
Engineering Application
Commissioning Place & Date: Chile (Transelec), 2022
Number of CICA Towers: 2+4
Project Description
Spain's first implementation of CICA towers in a 220kV transmission line, located within an island.
Design Condition
Pollution level : class E
Wind speed: V=31m/s
Ice cover : C=0mm
Benefits
Increase the ground clearance : 3m
Effectively resolved the issue of insufficient ground clearance
Improve pollution resistance level and Successfully completed retrofit
Engineering Application
Commissioning Place & Date: Spanish (Canary), 2023
Number of CICA Towers: 1