Power transmission forms the backbone of modern society. However, with ever-increasing energy demands, traditional transmission lines face challenges of insufficient capacity and excessive energy loss. Is there a technology that can maximize existing line resources while significantly improving transmission efficiency and reducing operational costs? ACCC® (Aluminum Conductor Composite Core) conductor represents an innovative solution that effectively addresses these challenges.

ACCC® conductor is a high-performance overhead conductor featuring a composite core made from a hybrid of carbon and glass fibers. This composite core replaces the traditional steel core in conventional conductors and is surrounded by trapezoidal-shaped annealed aluminum strands. Compared to steel cores, the composite core offers superior strength-to-weight ratio and lower thermal expansion coefficient, endowing ACCC® conductors with exceptional performance.

The core component of ACCC® conductor consists of carbon fibers, glass fibers, and thermosetting resin. Carbon fibers provide high strength and modulus, while glass fibers enhance toughness, with the thermosetting resin binding them together. This composite material offers several advantages:

• High strength-to-weight ratio: Lighter than steel cores yet stronger, allowing conductors to withstand greater mechanical loads.
• Low thermal expansion coefficient: Significantly lower than steel, resulting in reduced sag at high temperatures.
• Corrosion resistance: Immune to rust or corrosion, capable of withstanding harsh environmental conditions.

The conductive portion of ACCC® conductor uses annealed aluminum, known for excellent conductivity and ductility. To maximize aluminum content, trapezoidal-shaped strands are typically used, increasing current-carrying capacity compared to conventional round strands.

While ACCC® conductors function similarly to traditional overhead conductors in transmitting current through aluminum strands, their composite core significantly enhances performance. The core bears mechanical loads while aluminum focuses on current transmission, enabling safe operation under high loads and temperatures.

ACCC® conductors offer multiple benefits over traditional overhead conductors:

• Higher current capacity: Trapezoidal aluminum strands increase aluminum content, potentially doubling capacity compared to same-size ACSR conductors.
• Reduced line losses: Higher capacity allows lower current for equivalent power, cutting losses by 25%-40% or more.
• Reduced sag: Lower thermal expansion minimizes high-temperature sag, enabling more compact line designs.
• Enhanced reliability: Superior corrosion resistance and mechanical strength improve line reliability.
• Extended lifespan: Corrosion-resistant cores reduce maintenance and replacement frequency.

ACCC® conductors serve various transmission applications, including:

• Capacity upgrades: Replacing existing conductors without tower modifications to meet growing demand.
• New high-voltage lines: Improving efficiency and reducing environmental impact.
• Critical crossings: Enhancing safety over rivers, railways, and highways through reduced sag.
• High-demand areas: Meeting local power needs with increased capacity.

While installation methods resemble traditional conductors, ACCC®'s higher strength requires attention to:

• Tension control: Avoiding exceeding core capacity during installation.
• Connector selection: Ensuring compatibility for reliable connections.
• Regular inspections: Monitoring for damage or corrosion.

ACCC® conductor specifications vary by model, covering:

• Diameter (affecting capacity and strength)
• Weight (impacting tower design)
• Tensile strength (mechanical load capacity)
• DC resistance (affecting line losses)
• Current capacity (maximum transmission current)
• Thermal expansion coefficient (sag characteristics)

The ACCC® ULS (Ultra Low Sag) variant features enhanced composite cores with higher strength, lower thermal expansion, and increased modulus, offering:

• Longer spans: Reducing tower requirements and construction costs.
• Minimized sag: Improving safety and reliability.
• Wind/ice resistance: Reduced sway and sag under extreme conditions.

Optional non-reflective matte finishes minimize light pollution in sensitive environments.

ACCC® conductors represent a high-performance overhead solution offering increased capacity, reduced losses, and minimized sag. Their widespread applications in transmission systems demonstrate significant efficiency improvements and cost reductions, positioning them as a crucial technology for future power transmission needs.