90 km XLPE cable system has just been installed to reinforce the grid in western Norway to meet growing demand for electricity

Paris, June 6, 2016 – BKK Nett AS, the Norwegian power company based in Bergen, will soon be the operator of a recording breaking subsea power link as Nexans just completed a project to install the world’s longest and deepest 420 kV XLPE (cross-linked polyethylene) insulated submarine cable system. In a turnkey project worth around 75 million euros to reinforce the grid in western Norway, Nexans has delivered 90 km of 420 kV AC XLPE cable. This contract fulfils Nexans’ vision of helping to meet the growing global demand for electricity.

The new power link, comprising three single core cables in parallel, runs between Mongstad and Kollsnes, crossing two fjords: Hjeltefjorden and Lurefjorden. At its deepest point, the cables were installed at 390 m, making this both the world’s deepest 420 kV XLPE system, and longest at this depth, with a length of 22 km.

The cable system for the two fjords are manufactured, delivered and installed by Nexans. The cables were laid by Nexans’ cable laying vessel, C/S Nexans Skagerrak. In the near-shore areas, the cables were mainly protected with HDPE pipes, outer shells or trenched by water jetting.

Tom Skattum, Project Manager at Nexans Norway, said, “Achieving these new world records was a great challenge for Nexans and this contract for BKK represents the height of Nexans’ expertise in submarine power cables.”

The submarine cables have been manufactured at Nexans’ facility in Halden, Norway, and laying was completed in May 2016. This will be followed by termination work on shore, ready for the handover testing in autumn 2016.

Grid reinforcement project

BKK, one of Norway’s largest utility companies, is building the new connection to reinforce the power grid in the west of the country. The new power line is essential to ensure security of supply for the forecast growth in consumption by residents, businesses and industrial consumers in the Bergen region, which is an important growth area. It will also provide additional capacity for the grid connection of new generation resources.

The total length of the new 420 kV Mongstad to Kollsnes connection will be around 30 km. On land, overhead lines will carry the power. However, the majority of the route crosses two fjords, requiring the installation of the submarine cables.

日前，法国耐克森集团成功90千米420千伏交联聚乙烯绝缘海底电缆系统敷设，这是目前世界上敷设的最长、最深的海底交流电缆系统，这也意味着耐克森在这两方面创下了新的纪录。

据介绍，这条交联聚乙烯海底电缆连接挪威蒙斯塔德（Mongstad）和科斯奈斯（Kollsnes），电压等级420千伏，全长90千米，采用平行的三根单相电缆进行敷设，深度最高达到390米，这一深度敷设电缆长度达到22千米。

耐克森挪威公司项目经理Tom Skattum介绍说，此次电缆敷设采用的是耐克森最新升级的C/S Nexans Skagerrak海缆船，且在近海区域，所有海底电缆都采用HDPE管或其他方式进行保护。

据悉，此次所需海底电缆由耐克森位于挪威Halden生产厂负责生产，海缆敷设于上月底完成，接下来将进行登陆站终端设施建设，预计于今年秋季交付测试。

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［rsj0315 在 2016-6-7 16:22:20 编辑过］