Aluminum Conductor Composite Core (ACCC) is a next-generation high-temperature low-sag (HTLS) overhead transmission conductor. It features a high-strength carbon fiber composite core protected by a fiberglass sheath and helically wrapped with high-purity trapezoidal or round aluminum strands. This innovative design delivers significantly higher ampacity, lower sag, reduced line losses, and superior corrosion resistance compared to traditional ACSR or AAC conductors, making it the preferred solution for capacity upgrades and new high-voltage transmission projects.
Key Advantages of ACCC Conductors
- Exceptional Ampacity: Operates safely at temperatures up to 180°C–200°C, providing up to twice the current-carrying capacity of conventional conductors at the same sag level.
- Ultra-Low Sag Performance: Extremely low coefficient of thermal expansion above the knee-point temperature allows longer spans and reduced tower heights or reinforcements.
- Lightweight & High Strength: The carbon fiber composite core offers an outstanding strength-to-weight ratio, enabling more aluminum for better conductivity without increasing overall weight.
- Reduced Electrical Losses: Higher aluminum content and optimized stranding result in lower DC resistance and up to 25–40% reduction in line losses.
- Superior Corrosion Resistance: Ideal for coastal, mining, industrial, and heavily polluted environments where steel-core conductors suffer from accelerated corrosion.
- Excellent Thermal Stability & Low Creep: Minimal relaxation and long-term mechanical reliability under high operating temperatures and dynamic loads.
Main Applications
ACCC conductors are widely adopted in:
- Capacity upgrades of existing transmission lines without tower modifications
- New long-span high-voltage overhead lines
- Coastal and high-corrosion regions
- Heavy ice/wind load areas and river crossings
- Smart grid and renewable energy integration projects
Technical Specifications (Representative International Sizes)
| Conductor Name |
Size (kcmil) |
Area (mm²) |
Conductor Dia. (mm) |
Core Dia. (mm) |
Weight (kg/km) |
Rated Strength (kN) |
DC Resistance (Ω/km) |
Ampacity 180°C |
Ampacity 200°C |
| Copenhagen |
434 |
219.9 |
18.29 |
5.97 |
661 |
60.4 |
0.2094 |
1,017 |
1,070 |
| Lisbon |
623 |
315.5 |
21.79 |
7.11 |
948 |
85.7 |
0.1460 |
1,284 |
1,353 |
| Brussels |
832 |
421.4 |
25.15 |
8.13 |
1,265 |
112.0 |
0.1097 |
1,549 |
1,632 |
| Hamburg |
1,078 |
546.4 |
28.63 |
8.76 |
1,627 |
130.2 |
0.0846 |
1,834 |
1,935 |
| Athens |
2,782 |
1,409.6 |
44.75 |
10.54 |
4,066 |
188.3 |
0.0328 |
3,335 |
3,538 |
(Ampacity values based on standard conditions: 50 Hz, 25°C ambient, 0.5 solar absorptivity/emissivity, 0.61 m/s wind, etc. Custom sizes available upon request.)
Product Types
RLB offers a full range of ACCC variants to meet diverse project requirements:
- Formed Annealed Aluminum Conductors Composite Core Supported
- Thermal-resistant Aluminum-alloy Conductors Composite Core Reinforced
- Formed Intermediate Aluminum Conductors Composite Core Supported
- High-elongation Hard Aluminum Conductors Composite Core Reinforced
- High-conductivity (62.5% IACS) Aluminum Conductors Composite Core Reinforced
Manufacturing Standards
Produced in accordance with:
- GB/T 32502—2016
- Q/320282 DFP08—2017
- Q/320282 DFP05—2017
Packaging
Supplied on high-strength Wooden Steel Wood Drums أو Steel Drums for safe transportation, storage, and on-site handling.
Aluminum Conductor Composite Core (ACCC) represents the future of overhead transmission technology — delivering higher capacity, lower losses, longer spans, and extended service life while reducing total cost of ownership for modern power grids.
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