What is the difference between conductor AAAC and ACSR for OHTL?

AAAC (All Aluminum Alloy Conductors)

• AAAC are made out of high strength Aluminum-Magnesium-Silicon alloy.
• AAAC with different variants of electrical grade Alloys type 6101 and 6201.
• These conductors are designed to get better strength to weight ratio and offers improved electrical characteristics, excellent sag-tension characteristics and superior corrosion resistance when compared with ACSR.
• Equivalent aluminum alloy conductors have approximately the same ampacity and strength as their ACSR counterparts with a much improved strength-to-weight ratio, and also exhibit substantially better electrical loss characteristics than their equivalent single layer ACSR constructions. The thermal coefficient of expansion is greater than that of ACSR.
• As compared to conventional ACSR, lighter weight, comparable strength & current carrying capacity, lower electrical losses and superior corrosion resistance have given AAAC a wide acceptance in the distribution and transmission lines.

Features

• High strength to weight ratio
• Better sag characteristics
• Improved electrical properties
• Excellent resistance to corrosion
• Specifications
  • Higher Tensile Strength
  • Excellent Corrosion Resistance
  • Good Strength to Weight Ratio
  • Lower Electrical Losses
  • Moderate Conductivity –52.5% IACS

Typical Application

• Transmission and Distribution applications in corrosive environments, ACSR replacement.

 ACSR (Aluminum Conductor Steel Reinforced)

• Aluminum Conductor Steel Reinforced (ACSR) is concentrically stranded conductor with one or more layers of hard drawn 1350-H19 aluminum wire on galvanized steel wire core.
• The core can be single wire or stranded depending on the size.
• Steel wire core is available in Class A ,B or Class C galvanization for corrosion protection.
• Additional corrosion protection is available through the application of grease to the core or infusion of the complete cable with grease.
• The proportion of steel and aluminum in an ACSR conductor can be selected based on the mechanical strength and current carrying capacity demanded by each application.
• ACSR conductors are recognized for their record of economy, dependability and favorable strength / weight ratio. ACSR conductors combine the light weight and good conductivity of aluminum with the high tensile strength and ruggedness of steel.
• In line design, this can provide higher tensions, less sag, and longer span lengths than obtainable with most other types of overhead conductors.
• The steel strands are added as mechanical reinforcements.
• ACSR conductors are recognized for their record of economy, dependability and favorable strength / weight ratio.
• ACSR conductors combine the light weight and good conductivity of aluminum with the high tensile strength and ruggedness of steel.
• In line design, this can provide higher tensions, less sag, and longer span lengths than obtainable with most other types of overhead conductors.
• The steel strands are added as mechanical reinforcements.
• The cross sections above illustrate some common stranding.
• The steel core wires are protected from corrosion by galvanizing.
• The standard Class A zinc coating is usually adequate for ordinary environments.
• For greater protection, Class B and C galvanized coatings may be specified.
• The product is available with conductor corrosion resistant inhibitor treatment applied to the central steel component.

Features

• High Tensile strength
• Better sag properties
• Economic design
  • Suitable for remote applications involving long spans
  • Good Ampacity
  • Good Thermal Characteristics
  • High Strength to Weight Ratio
  • Low sag
  • High Tensile Strength

Typical Application

• Commonly used for both transmission and distribution circuits.
• Compact Aluminum Conductors, Steel Reinforced (ACSR) are used for overhead distribution and transmission lines.