TransPowr® AAC/TW Bare Overhead Conductor (US)

TransPowr® AAC/TW is a trapezoidal 1350 H19 aluminum (AAC) conductor that features concentric-lay stranded construction. The aluminum strands used in this conductor are trapezoidal in shape. This wedge-shaped design allows for a more compact arrangement of the aluminum wires. 

When comparing with conventional round conductors, designs that maintain the same circular mil cross-sectional area of aluminum result in a TW conductor that is 10 to 15 percent smaller in overall diameter. Conversely, designs that keep the same overall diameter as a conventional round conductor allow for a TW conductor that contains 20 to 25 percent more aluminum cross-sectional area. 

The AAC/TW conductors are manufactured in accordance with the latest ASTM B778 standards. Depending on the configuration, the conductor can consist of two, three, four, or five layers of 1350-H19 aluminum wires. The sizes and constructions listed on this and the following pages are examples of those used in overhead lines.

Features and Benefits

The TransPowr AAC/TW conductor has a continuous operating temperature rating of 75°C. Operating the conductor at elevated temperatures may increase sag and reduce its rated tensile strength. 

AAC/TW conductors, which are designed to have an equivalent aluminum circular-mil cross-sectional area, are smaller in overall diameter compared to conventional round-wire AAC conductors. This reduced diameter minimizes the impact of ice and wind loading on the conductor. 

Additionally, AAC/TW conductors that are constructed to have an equivalent overall diameter allow for a greater circular mil cross-sectional area of aluminum within the conductor. This design not only reduces power loss during day-to-day operations but also significantly increases the conductor's current-carrying capacity.

Applications

Trapezoidal 1350 H19 aluminum conductors (AAC/TW) are utilized for overhead transmission lines where the design specifications do not necessitate the higher strength or temperature ratings offered by ACSR, ACSS, or other types of conductors.

Electrical Parameters

The electrical parameters for the trapezoidal AAC, including the equivalent circular mil area and equivalent overall diameter of the conductors, can be found in the last table of the datasheet.

Options

• E3X® surface coating (/E3X)
• High-conductivity aluminum (/HC) (62.2% IACS)
• Non-specular surface finish (/NS)