What is the meaning of export cables?

Connecting a project site to shore generally involves an export cable from a substation. For long distances, export cables have less transmission loss if they are DC (HVDC High Voltage Direct Current). For small to medium distances, AC (HVAC High Voltage Alternating Current) is a more efficient choice. If the substation is a bottom-fixed structure, export cables can be static cables. For floating substations, export cables need to be dynamic. High power dynamic export cables currently do not exist and are the one remaining missing piece of the FOWT
cable industry to develop and qualify. Currently, the industry is closer to qualifying high-voltage AC cables than DC.

Existing floating wind projects are small enough in power and relatively near shore to not require a wildly different-sized export cable to inter-array cable. To satisfy future project requirements, manufacturers are working to qualify dynamic export cables of up to 220 kV. As a point of comparison, current HVAC static export cables are typically rated at 220 kV and HVDC static export cables used for larger and more distant offshore wind projects are rated at 320 kV.











source : You are not allowed to view links. Register or Login