This specification covers shaped wire compact concentric-lay-stranded aluminum conductors, supported by a polymer matrix composite core (PMCC) for use as overhead electrical conductors. The polymer matrix composite core conductor is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidal shaped wires (TW). The conductors consist of a polymer matrix composite, central core of carbon and glass fibers embedded in a polymer matrix, surrounded by one or more layers of trapezoidal aluminum 1350-0 wires. Different strandings of the same size of conductor are identified by type, which is the approximate ratio of polymer matrix composite core area to aluminum area expressed in percent.
Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors supported by a Polymer Matrix Composite Core have been on the market for about 7 years. These conductors are similar to ACSS conductors, in that they use fully annealed 1350 Al. The trapezoidal strands are wrapped around a polymer matrix composite core, that consist of carbon fibers embedded in a polymer matrix, surround by a shell of insulating material to keep the carbon and aluminum from coming into contact. With nearly 7000 miles of this type of conductor installed all over the world, a standard is now needed.
Overhead conductor; polymer matrix composite core; concentric-lay stranded aluminum conductors
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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