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News

XLPE insulation for DC-application, a new and revolutionary application

Borealis A/S : 21 June, 2000  (New Product)
Polymeric cables have to a great extent replaced fluid-filled cables in AC distribution and partly in AC transmission systems. The situation is, however, different for high voltage DC-systems as the build-up of space charges has been seen as a limiting factor. With the introduction of new solid state AC/DC and DC/AC converters the need for suitable DC-insulation has increased and Borealis has, together with ABB, after several years of co-operation designed a suitable polymeric insulation system.
Polymeric cables have to a great extent replaced fluid-filled cables in AC distribution and partly in AC transmission systems. The situation is, however, different for high voltage DC-systems as the build-up of space charges has been seen as a limiting factor.

With the introduction of new solid state AC/DC and DC/AC converters the need for suitable DC-insulation has increased and Borealis has, together with ABB, after several years of co-operation designed a suitable polymeric insulation system.

Materials that can be extruded using conventional XLPE lines have been produced for a project to connect a Windmill generator of 50 MW 80kV DC located on the southern tip of the isle of Gotland (Gotland is also known for the world's first commercial HVDC-transmission in 1954) with the present AC-systems come 70 km away. The 'HVDC Light' -cable, as it is known, will be installed and taken into service during the summer of 1999, but several other projects in different parts of the world are already on the drawing board.
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