High voltage cables expert

- experience with all aspects of cables from O&M, FEED-studies, design to installation, repairs, spare-parts, offshore surveying, on-line monitoring, testing, fault finding and contingency management. 

Examples of service could be: 

  • Technical advisor for clients on cable systems.

  • Field report - documentation of the cable integrity all the way from factory, transportation over installation, testing and finally energization. 

  • Contingency management - we can develop your contingency plan to deal with cable faults. 

  • Spare parts - review of operational portfolio or project to assess the need for spare-parts. 

  • A monitoring strategy - world class monitoring applied to be simple and highly effective. On land it could be scheduled route survey and cable awareness in the area with relevant stakeholders. In the offshore section it could involve online monitoring like distributed temperature sensing (DTS), distributed acoustic sensing (DAS), partial discharge (PD) also scheduled surveys of the seabed, multibeam/bathymetry, sidescan, depth-of-burial. Preventive action through raising cable awareness with authorities, vessel traffic, fishery and local community. 

  • Fault finding and fault location - we can help with expert knowledge. 

  • Root cause failure analysis - post mortem analysis of failed cable. 

High voltage cables 

Submarine cables are used to interconnect an offshore wind farm.
  • The cable system connecting the wind turbines with the offshore substation is often called the inter-array system
  • The cable system used to connect the offshore wind farm with land is often called the export cable system, or collector cable. 
Land cables are used like overhead lines to connect customers with the power grid.
  • Land cable in an offshore wind farm context are installed from the beach landing point, spliced with the submarine type, and connected to the onshore substation. 

Want to know more?
Array cables are typically compacted cupper or aluminium cores, in close three foil formation power cores, operated at 33kV moving to 66kV also one or more optical fibre tubes with up to 96 single mode fibers. On the outside the cables are protected by armour wires and a serving which could be polypropylene wires. Holding the power cores and optical fibre tubes in place, on the inside of the armour wires could be polypropylene wires or a template.

Cable protection system (CPS) can be used in a number of applications most often in the area of transition from seabed to monopile/jacket structure but also with submarine cable crossings. Installing CPS needs to be limited to "need to have" situations because it is adding complexity to the offshore cable installation and in addition it can quickly become the thermal bottleneck if the thermal considerations from the desktop study does not meet the reality of the marine environment.