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Composite Technology Corporation (CTC) has received an order from PacifiCorp, one of the largest utilities in the Western U.S., for 22 linear-miles of high-capacity Composite transmission cable.
The purchase order for the cable, called TransPowr ACCC/TW (Aluminum Conductor Composite Core), which utilizes CTC’s proprietary cable technology, was the result of a joint sales effort by General Cable and CTC pursuant to agreements between them and represents a sale of approximately $800,000. Installation of the project will begin September 1 and will be operational by December 1, 2005.
CTC’s core technology for developing high- performance composite-core cables enables the conductor to carry up to twice the power of traditional aluminium cables. The ACCC composite core is stronger and significantly lighter than its steel core counterpart in traditional conductors. This allows 28 percent more conductive aluminium in the same diameter cable with the same overall weight as a conventional steel core conductor, enabling ACCC cable to carry more electricity more efficiently.
Portions of PacifiCorp’s existing 138 kV system, in the Salt Lake City metro area, will be reconductored to increase existing line capacity without rebuilding or reinforcing existing support structures.
Franco Albi, Consulting Engineer for PacifiCorp said, “”Our decision to reconductor this segment of 138 kV line with ACCC was guided by its superior low sag characteristics and ability to increase delivery capacity during peak periods. By using the TransPowr ACCC/TW conductor, we eliminated the need to replace or reinforce approximately 29 support structures, which would have been required had we used conventional transmission conductors.
PacifiCorp’s ability to reconductor the existing line will also allow the necessary upgrade without delays or lengthy commercial disruption for additional tower support construction.”” “”The reconductor strategy with ACCC also proved to be an economical option over other prospective considerations,”” Albi added.
The ACCC cable core is made using high-strength fibres and polymer resins that are wrapped with aluminium wires. The company state that the composite core material expands very little when heated, only about a tenth as much as conventional steel core, resulting in a reduction in line sag problems. The replacement line of high-capacity ACCC cable is expected to support the delivery of electricity during peak periods by increasing the capacity of this transmission segment.
“”PacifiCorp is typical of the nation’s utilities with lines that need additional capacity,”” said CTC’s CEO, Benton Wilcoxon. “”In the past, these lines had to be viewed as complete structure and cable replacement. With the ACCC cable, utilities can reduce costs significantly by increasing the capacity without replacing the structures and still obtaining a significant increase in load capability. The resulting reduction in capital cost is a significant cost savings to their ratepayers while increasing load capacity.””
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