According to a study by the Metatech Corporation, commissioned under Executive Order 13407 for assessment of vulnerability to geomagnetic storms, manufacturers presently have a backlog of nearly three years for all extra highvoltage transformers (230 kilovolts and above). Only one plant exists in the U.S.A. capable of manufacturing a transformer up to 345 kV. There is no manufacturing capability in the U.S.A. for 500 kV and 765 kV transformers, which represent the largest group of at-risk transformers in the U.S. power grid. The 500 and 765 kV transformers are the backbone of the grid that extends into regions that contain nearly 80 percent of the U.S. population, according to John Kappenman of Storm Analysis Consultants and Metatech Corp.
James Wright on 10 Nov 11Nexans, a leading global cablemaking company, has been awarded a contract to design, manufacture and supply Chevron U.S.A with 42km of power umbilicals and terminations for the Jack and St. Malo oil fields in the Deepwater Gulf of Mexico. In addition to the conductor which delivers a high voltage power supply, the power umbilical, which was pioneered by Nexans, includes a number of steel tubes, fibre optic elements and signal cables for control and monitoring purposes. By eliminating the need to transport and install separate power and control lines, the power umbilical significantly reduces transportation and installation costs.
