Power cable engineering expertice
In-house experience with the whole lifecycle of submarine and land power cables. 

Experience from a large portfolio of power cables, this gives a good insight into the variety of challenges owners and operators might have. The best international standards from the leading associations like IEC and Cigré are used:

  • IEC 60038:2002 IEC standard voltages

  • IEC 60840:2011 Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) – Test methods and requirements

  • IEC 62067:2011 Power cables with extruded insulation and their accessories for rated voltages above 150 kV (Um = 170 kV) up to 500 kV (Um = 500 kV) – Test methods and requirements

  • IEC 63026:2019 - Submarine power cables with extruded insulation and their accessories for rated voltages from 6 kV (Um = 7,2 kV) up to 60 kV (Um = 72,5 kV) – Test methods and requirements
  • IEC 62271 – 209 Cable connections for gas-insulated metal-enclosed switchgear for rated voltages above 52 kV – Fluid-filled and extruded insulation cables – Fluid-filled and dry-type cable-terminations
  • CIGRE Technical Brochure 490 Recommendations for Testing of Long AC Submarine Cables with Extruded Insulation for System Voltage above 30 (36) to 500 (550) kV

  • ELECTRA 189 Recommendations for testing of long AC submarine cables with extruded insulation for system voltage above 30 (36) to 150 (170) kV

  • and more ..

Examples of service

  • Cable packet management - you need someone to buy the cables and see them installed. 

  • Technical advisor for clients on power cables and accessories.

  • Field report - documentation of integrity in a part of or the entire 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 - we can look at what you have and what you should have. 

  • Monitoring strategy - world class monitoring on land or at sea.

  • Fault finding and fault location - where is it, and how should you handle it?

  • Root cause failure analysis - a cable or accessory has failed and you would like to know why. 

More information about power 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. 

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.

A power cable 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.