Cables require several different products at the floating substructure and offshore substation interfaces.

What it costs

About £4 million for a 450 MW floating offshore wind farm.

Who supplies them

Balmoral, MacArtney, Oceaneering, Subsea Energy Solutions, Tekmar and WT Henley.

From left to right: Cable hang-off clamp, and Cable pull-in head.
From left to right: Cable hang-off clamp, and Cable pull-in head. Image courtesy of Tekmar and Oceaneering. All rights reserved.

Key facts

Hang-off clamps are installed where the cable connects to the floating substructure (dynamic hang-offs) and the offshore substation (static hang-offs). Hang-off clamps ensure the cable is mechanically secured after installation, to make certain that the mechanical stresses are safely borne by the cable armouring and not by the core.

Pull-in heads enable the safe installation of the cable to a floating or fixed foundation (see I.2.5 for further information). They typically connect directly to the cable armouring to ensure that all mechanical forces associated with pulling the cable are borne by the armour rather than the core. They are usually made from machined steel and are hot dipped galvanised and zinc plated.

Terminations connect the cable conductors to the electrical switchgear above the hang-off assemblies. Terminations connect to inline or T-connectors at the switchgear.

Cable tubes (J-tubes or I-tubes) route the cables from the outside to the inside of floating substructures and substation foundations and protect the cables from wave action.

What’s in it

Guide to a Floating Offshore Wind Farm