Transmission Conductors for Overhead Power Lines

All-aluminum 1350 conductors (AAC) are used in overhead line installations where design parameters do not require the higher strength or temperature ratings provided by ACSR, ACSS, or other conductors. They provide optimum economy since the lighter weight means lower unit length costs, easier handling in installation and less-complex fittings. All-aluminum conductors have an inherent high-corrosion resistance due to their homogeneous construction

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AAAC aluminum alloy conductors are extensively used for overhead distribution and transmission lines adjacent to ocean coastlines where there can be a problem of corrosion in the steel of an ACSR construction. The aluminum alloy conductors are used in place of single-layer ACSR conductors (i.e., #6 to #4/0 AWG) to reduce power losses in overhead distribution and transmission lines. In addition, the inductive effect of the ACSR's steel core is eliminated, increasing the line's operating efficiency.

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Aluminum conductors, steel-reinforced (ACSR) are extensively used for overhead distribution and transmission lines. ACSR conductors are recognized for their record of economy, dependability and favorable strength/weight ratio. ACSR conductors combine aluminum's light weight and good conductivity 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.

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Aluminum conductor steel-supported (ACSS) is used for overhead transmission lines. It is especially useful in reconductoring applications requiring increased current with existing tensions and clearances; new line applications where structures can be economized due to reduced sag; new line applications requiring high emergency loadings; and lines where aeolian vibration is a problem.

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T-2® twisted pair conductors are used for overhead distribution and transmission lines, which are subject to wind-induced motion damage. Available in all-aluminum (AAC/T-2) and aluminum conductor steel-reinforced (ACSR/T-2), these designs eliminate galloping, reduce aeolian vibration and control sub conductor oscillation.

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TW conductors utilize aluminum strands that are trapezoidal shaped to provide a smooth outer surface and a more compact alignment. They allow the build of a conductor that either has the same a) cross-sectional area of aluminum and a reduced overall conductor diameter or b) overall conductor diameter as before but now squeezes in more aluminum cross-sectional area. Reducing the overall diameter of the conductor provides the advantage of lowering the resultant ice and wind loading on the conductor. Maintaining the same diameter by increasing the aluminum metal content means lower power loss in the conductor for day-to-day operations and a higher overall conductor ampacity rating.

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ACCC^®/TW conductors have been designed explicitly for overhead power distribution and transmission lines and are especially useful in reconductoring applications requiring minimal thermal sag without structural modifications.

ACCC^® Conductor is an internationally patented and trademark-registered product of CTC Global Corporation. Prysmian Group is a qualified and licensed CTC Global manufacturer of ACCC^® conductors.

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ACSR/SD conductors are used for overhead transmission lines to control Aeolian vibration. The steel core and the two layers of trapezoidal-shaped aluminum wires in ACSR/SD are separated by a gap designed to provide self-damping characteristics to control Aeolian vibration—eliminating the need for vibration dampers.

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AWAC conductors are used as guy wires, shield wires, static wires, overhead ground wires, messengers, span wires, etc. Aluminum-clad steel wires offer increased corrosion resistance and higher conductivity versus standard galvanized steel wires.

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ACAR conductors are used for overhead distribution and transmission lines requiring all aluminum conductors but requiring higher strength and longer spans than what is capable with AAC conductors. Aluminum conductor alloy-reinforced (ACAR) cable delivers high current-carrying capacity and strength combined with lower conductor weight.

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