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HV Subsea Cable Repair Joint

For the offshore repair of high voltage subsea cables damaged during installation or in operation Power CSL offers its innovative repair joint.

The joint which is designed for repair of subsea cables up to a voltage level of 170kV utilises cold-shrink technology from 3M as the electrical insulation component ( The design has been subject to extensive electrical, mechanical and thermal analysis and has been tested to CIGRE 490, 171 and 623 regime (mechanical / electrical / hyperbaric) .

The design is modular in nature allowing jointing of different cable designs and sizes. The product can be configured to include optical fibre and low voltage control jointing components. The product is rapid to install with assembly time in the order of 48-60 hours thereby reducing weather window waiting period and repair vessel time on station.

The joint utilises high tensile strength compression conductor connections. The insulation reinstatement system is a one piece cold shrink moulding incorporating stress control components. All mouldings are electrically tested (HV and PD) post manufacture. The single piece construction and shrink down technique remove the potential for assembly problems during installation (that may otherwise arise with some multi component insulation moulding systems).

The applications for Power CSL’s HV repair joint include :

  • Repair of offshore windfarm high voltage array cables (66kV)
  • Repair of offshore windfarm high voltage (AC) export cables (to 170kV)
  • Repair of high voltage island link cables

Power CSL offers trained offshore certified technicians for installation of the joint, or alternatively a training service for Client’s technicians.

Key features of the Power CSL high voltage subsea cable joint :

  • Fully tested to CIGRE recommendations 490 and 623
  • Test programme witnessed by DNV GL
  • Can be configured to joint subsea cables of different designs and conductor sizes
  • High tensile strength conductor jointing
  • Proven one piece cold-shrink moulding insulation reinstatement
  • Incorporates optical fibre splice enclosure
  • Joint casing incorporates cathodic protection
  • Rapid installation
  • No special tools required
  • Minimum design life 25 years
Download high voltage repair joint datasheet

Products & Services

Power CSL provides a complete range of subsea cable and umbilical products and services – from factory jointing (splicing) of medium and high voltage power cores to thoroughly engineered and tested cable accessories including offshore repair joints.


Power CSL’s facilities at its headquarters in Kent, UK, includes impressively equipped cable jointing workshops, a dedicated high voltage laboratory and a wide range of analytical, mechanical, and hyperbaric test capabilities.