HV underground and submarine cables


  • XLPE cables are rapidly replacing fluid filled cables

For the Ormen Lange (“Long Serpent”) field, Nexans is delivering the world’s first 420 kV XLPE submarine cable to replace fluid–filled cables.

Related products and solutions

MV underground power cables
Outdoor Energy cables

Our two leading types of medium-voltage cable are XLPE (cross-linked polyethylene) and EPR (Ethylene Propylene Rubber). The former is used worldwide, while the latter is mainly for selected markets.

From a design point of view, medium-voltage cables are of three types:

  • single-core cable,
  • three single-core cables laid-up,
  • three-core cable.

Nexans cables are custom designed to meet your high performance standards.

Outdoor Energy cables/Land High Voltage cables

A proven performer since the late 1930s, paper-insulated, fluid-filled  cable has been constantly refined to deliver high voltages in a host of environments, including underground, tunnels, shafts, and deep  ocean depths. A tube-like stranded copper or aluminum conductor carries fluid under pressure which permeates the surrounding paper  layers to ensure uniform conductivity. Various metal sheaths prevent water penetration, with a polyethylene jacket for outer protection in underground applications. Their proven characteristics:  

  • Excellent electrical qualities
  • Proven reliability at very high voltages
  • A homogeneous insulation system ensured by fluid-impregnated paper
  • Custom-designed for tough environments   
XLPE insulated
Outdoor Energy cables/Land High Voltage cables

Since the late 1960s we have been developing an entire range of XLPE (cross-linked polyethylene) insulated cables for high voltage-transmission.

This kind of cable consists of a stranded copper or aluminum conductor with an extruded insulation system which is further protected by a metallic shield and an outer sheath. In submarine applications, the cable is normally designed with a lead sheath and outer steel-wire armor

XLPE cables are predominantly used in underground networks, but  are gradually replacing traditional paper-insulated, fluid-impregnated cables undersea, as well.

They have several distinct advantages:


  • Flexibility, lightness and strength
  • No need for an auxiliary fluid-pressure system
  • Low maintenance compared to fluid-impregnated cables
  • Simpler accessories

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