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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，法國(guó)耐克森集團(tuán)成功90千米420千伏交聯(lián)聚乙烯絕緣海底電纜系統(tǒng)敷設(shè)，這是目前世界上敷設(shè)的最長(zhǎng)、最深的海底交流電纜系統(tǒng)，這也意味著耐克森在這兩方面創(chuàng)下了新的紀(jì)錄。

據(jù)介紹，這條交聯(lián)聚乙烯海底電纜連接挪威蒙斯塔德（Mongstad）和科斯奈斯（Kollsnes），電壓等級(jí)420千伏，全長(zhǎng)90千米，采用平行的三根單相電纜進(jìn)行敷設(shè)，深度最高達(dá)到390米，這一深度敷設(shè)電纜長(zhǎng)度達(dá)到22千米。

耐克森挪威公司項(xiàng)目經(jīng)理Tom Skattum介紹說(shuō)，此次電纜敷設(shè)采用的是耐克森最新升級(jí)的C/S Nexans Skagerrak海纜船，且在近海區(qū)域，所有海底電纜都采用HDPE管或其他方式進(jìn)行保護(hù)。

據(jù)悉，此次所需海底電纜由耐克森位于挪威Halden生產(chǎn)廠負(fù)責(zé)生產(chǎn)，海纜敷設(shè)于上月底完成，接下來(lái)將進(jìn)行登陸站終端設(shè)施建設(shè)，預(yù)計(jì)于今年秋季交付測(cè)試。

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［rsj0315 在 2016-6-7 16:22:20 編輯過(guò)］