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New High-Voltage Cables Facilitate Higher Current Transmission
04/01/2011 - ThyssenKrupp VDM (Werdohl) has introduced a new material designed to resist high-voltage cable’s natural tendency to heat up and sag when transporting higher currents.
ThyssenKrupp VDM (Werdohl) has introduced a new material designed to resist high-voltage cable’s natural tendency to heat up and sag when transporting higher currents.
The new material has the potential to increase the efficiency of power lines and so boost the capacity of existing grids, which in many industrial regions are already operating at their load limit. This could reduce the need to build new power lines and the associated large transmission towers.
In addition to the cost saving for energy utilities, ThyssenKrupp VDM’s new material — Pernifer 36 MoW — also offers benefits for the environment and the landscape.
“This high-performance material opens up new possibilities for utilities in the construction of power grids, and also has positive effects for the environment,” explained Dr. Jutta Klöwer, Head of Research and Development at ThyssenKrupp VDM. “That’s why we believe there will be a high demand for our product.”
With conventional overland power lines, current transmission is limited because when high currents are transmitted the cables undergo excessive thermal expansion and sag too much. The new high-performance material Pernifer 36 MoW has a factor of 4 lower thermal expansion and high mechanical strength, allowing higher current-carrying capacity. Despite the increased heating due to the higher load, the power lines do not sag in critical areas as would be the case with conventional cables.
ThyssenKrupp VDM achieves these properties in the iron-nickel alloy among other things through the addition of carbon, molybdenum and tungsten to form molybdenum-tungsten carbides. Cold drawing adds a further increase in strength. Subsequent coating of the wire with aluminum is carried out by the customer.
ThyssenKrupp VDM (Werdohl) is one of the world’s leading manufacturers of high-performance materials, including nickel alloys, special stainless steels as well as zirconium and titanium mill products. The company has been supplying sheet, plate, rod, ingots, strip and wire for more than 80 years. ThyssenKrupp VDM employs approximately 1800 employees at its German production sites in Werdohl, Altena, Unna, Siegen and Essen.
