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Tether clamp transitions (dependent on the level of motion at the tether clamp location) (Fig.5)Ĭable bend protection analysis and designĪ cable’s bend protection requirements can be unique to each application.Topside floating foundation connection (Fig.5).Monopile with scour pit: inside and outside monopile (Fig.2).Monopile with scour protection: inside and outside monopile (Fig.1).Cable bend protection, key applicationsįigures 1 – 5 illustrate the critical locations where dynamic bend protection should be applied to power cables. To mitigate this, bend protection is needed. As the cables have relatively low stiffness, they are highly susceptible to both over-bending and fatigue damage at this point. These motions and loads concentrate toward the rigid connection point where the cable experiences a sharp transition in stiffness.
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In the exposed areas described, the dynamic forces on the cable produces cyclical motions relative to the foundation. With floating wind platforms, the cable is exposed over longer lengths in the water column between the seabed and the floating foundation of the turbine and will potentially experience even greater levels of dynamic load and motion. In this exposed area, the cable becomes subject to loads and motion from the surrounding sea conditions. In some cases, the burial point can typically be as far as 30 m from its connection point and can be even longer if there has been significant seabed scour around the foundation of the structure. With fixed wind turbine structures, the cable is typically protected through trenching and burial for the majority of its length.
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While numerous kilometers of power cables are installed on every windfarm, they are vulnerable to damage at a number of critical locations. Careful consideration is essential in order to maintain the integrity of the power cables for the life of the field.
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ORCAFLEX COST INSTALL
High-voltage power cables are both expensive to install and replace, with replacement costs in the region of millions of dollars, even before factoring in wind turbine down-time and the huge loss of revenue from reduced output.Įxperience gathered from fixed wind technologies, along with the drive of floating wind into increasingly dynamic environments, has increased focus and highlighted the importance of cable protection. Protecting these critical power cables from excessive movement or bending is of utmost importance. Even with the development of larger turbines, these quantities are expected to increase by a factor of three by 2050.Ĭritical to their successful operation are the subsea power cables that have the essential function of transmitting generated power from the turbines to the substations and then onward to shore. Floating wind turbine with Trelleborg’s Njord BS (Bend Stiffeners) and Trelleborg’s Njord DBM (Distributed Buoyancy Modules)īy 2025, it is anticipated that close to 20,000 turbines with 250+ offshore substations will have been installed offshore.