There are in principle two different types of extruded XLPE cables. The main difference between these two is the type of insulation material which is used for manufacturing the cable:
- High Voltage Direct Current (HVDC) cables
- High Voltage Alternating Current (HVAC) cables
HVDC extruded XLPE cables are used for 320 kV voltages, and is a more novel technology than the extruded HVAC cables are. Nexans has qualified 320 kV submarine HVDC extruded cable system during 2016 and the technology is growing fast on the market these days.
The extruded insulation system for HVAC cables has been in use for submarine cables manufactured by Nexans Norway AS for more than 30 years with excellent service experience.
For both types of cables the insulation system is made of cross-linked polyethylene (XLPE), a material with very good mechanical, thermal and electrical properties for its purpose.
The extrusion process is of great importance to the insulation system and Nexans has been using a triple extrusion process for almost 40 years. Since then, Nexans has improved the production process and been through material developments.
Today, the extrusion of all three layers is carried out in a single triple/quadruple extrusion head, thus minimising the risk of contaminants in the interfaces.
Choose the tab "docs and info" / "relevant informasjon" for a general description of the XLPE cables constituents.