High Voltage OWF Export Cable Repair Joints (to 170kV)
For the offshore repair of high voltage OWF export cables (to 170kV) damaged during installation or operation Power CSL offers its robust and reliable repair joint product.
The joint which has been designed for rapid offshore installation utilises cold-shrink insulation reinstatement technology and has been subject to rigorous testing to IEC 60840 specification, and CIGRE 490 and TB623 recommendations (mechanical / electrical / hyperbaric RWP).
The design is modular in nature allowing jointing of different cable designs and sizes. From an Operations & Maintenance perspective one range taking repair joint can be configured to cover the full range of an OFTO’s or TSO’s export cable assets. This allows a centralised pool of repair joints to be held (rather than multiple bespoke repair joints for each export cable), and when required enables spare export cable from one OWF to be used for repair on another OWF export cable.
PCSL has supplied range taking export cable joints to OFTOs and marine contractors providing cable repair framework services to OFTOs and TSOs. The repair joint has been used successfully on challenging export cable repairs in UK waters.
PCSL offer product familiarisation courses for its HV export cable repair joint to suitably experienced technicians. This approach facilitates a wider pool of available offshore technicians.
The joint utilises high tensile strength compression conductor connections. The insulation system is comprised of a one piece cold-shrink moulding with integrated stress control elements, developed by 3M, and selected and refined by PCSL for subsea applications following close technical collaboration. All joint bodies are electrically tested (HV & PD) as a standard routine QC measure. The combination of 100% electrical test, single piece construction, and cold-shrink application technique removes the potential for installer error that may arise from multi-component insulation reinstatement systems. The joint bodies are housed within individual resin filled metallic canisters which are sealed to the extruded core lead sheath on each side of the phase joint.
The joint includes a stainless steel optical fibre splice enclosure(s) which incorporates highly adaptable bonding/earthing connection arrangements in order to accommodate different OF cable designs such as copper tube, stainless steel tube, Al armoured etc.
All internal components are housed within a free flooding corrosion resistant overall steel casing fitted with anodes. The product utilises high tensile strength armour terminations.
The repair joint can be supplied with bend stiffeners or bend restrictors to suit installation requirements.
Key features of the Power CSL high voltage OWF export cable repair joint design :
Voltage up to 170kV Um
Type tested to IEC 60840 and CIGRE recommendations
300mm2 to 1800mm2 conductor size range in copper or aluminium.
Range taking 300 mm2 to 630mm2 , 630mm2 to 1200mm2, 1000mm2 to 1800mm2 (all subject to cable design review)
Accommodates XLPE or EPR based cable insulation systems