oFFshore Wind Farms - Cowi

cable engineeringand routingInter Connection Cable DesignCOWI designs medium voltage cables, and 36 kV arraycabling and provides related electrical design - conceptualas well as detailed.Export cable engineeringCOWI prepares detailed designs of export cable solutionsup to 400 kV. We also carry out conceptual designstarting from the choice between offshore substation andhigh-voltage cable and the alternative onshore substationplus one or several 33-66 kV cables from wind turbinesto shore. Trenching and cable burial is a core element inour assistance and experience.Horizontal directional drilling (HDD)Often, cables cannot be laid in open trenches in someareas (i.e. legal or environmental restrictions), or it is notthe best solution (i.e. soil formations, high water level,etc). In these cases directional horizontal drilling can bethe solution to, for example, establish casings used topull in the cables.Our services include:››In the planning phase - finding the optimal trace andtaking authorities, soil conditions etc. into consideration››Preparation of tender documents››Interface review››Contracting work››Review of the contractors’ design documents››Supervision under the construction phase››Trenching and cable burial.In relation to offshore cables and pipes, COWI presentsrelevant geological and geophysical data as 2D profilesfor assessment of burial and protection options. At thelandfall locations COWI uses the 2D geological profilesto evaluate feasibility of horizontal directional drillings andinvestigation of suitable installation depths.