Cable crossing of North Sea Canal

Visser & Smit Hanab has been commissioned by TenneT to construct a 380 kV cable crossing under the North Sea Canal, including the substations on each bank. To minimise the disruption to shipping along the navigable channel, the decision was made to cross the water underground.

 

 

Facts and figures

Drilling
2x 775 metres HDD, 34 metres deep (based on NAP, the Amsterdam ordnance datum).
Equipment
450-tonne HDD drill rig.
Pipeline
2x 508 mm steel pipe casing, fit for cooling.
Cables
Type: EYLKrvlwd 220/380 kV 1x2500 CuMilox. 2x 6 cables in a bundle, for a total of 12 cables in two separate pipe casings.
Equipment
Cable drums, pull winch and equipment for bundling cables.
Substation
Foundations for steel structures for the cable terminals, voltage transformers, and surge arresters and construction of these components.
Project categories

Drilling

The water crossing will be accomplished with two directionally drilled boreholes, 10 metres apart and each 775 metres long. After the first boring is completed, the project team will insert the pipe casing into the borehole. The casing is made of Ø 508-mm steel pipe joined by our welders and fitters onsite. Once the first pipe casing has been installed, the second borehole will be drilled and its pipe installed.

Cables

Visser & Smit Hanab will be using a technique in which 12 cables are bundled together to pull in the 380 kV cable connection. This allows us to install six high-voltage cables, including fibre-optic lines, in each pipe casing.

 

We will also be constructing substations on each bank. These are the points where the underground lines connect to the electricity pylons.

 

Would you like to read more about this project? Click on this link.

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