The objective of the cables working group is to identify and process improvements to reduce cable failure rates and installation costs. Cable related incidents account for 80% of insurance claims and around 60% relate directly to cable damage during construction. In addition, the cost of cable supply and installation for wind farms typically account for 8-12% of overall CAPEX costs and therefore, improving the cable installation and operation is fundamental driver to cost reduction.
We run collaborative projects engaging with universities, cable manufacturers, installers, insurers and the wider supply chain to address knowledge gaps and suggest innovative solutions to cost reductions through a range of desk based studies, model development and testing and demonstration. We have a number of on-going projects including studies on armoured cable losses, dynamic thermal ratings, an assessment of pre-terminated and pre-stripped cables and on-going support to innovators of condition monitoring systems.
Cable Burial Risk Assessment (CBRA)
There are significant advantages in optimising the Depth of Lowering such as reduction in costs associated with less time and, possibly, alternative vessels and equipment required for conducting burial operations, reduction in cable handling during burial operations thus reduction in potential risk of damage etc. The Cable Burial Risk Assessment (CBRA) method is a repeatable process that defines a target Depth of Lowering which is practically and economically achievable whilst providing adequate protection to the cable.
Cable Condition Monitoring Competition
The first competition of this work stream was launched at the beginning of 2017 to identify and fund the development of innovative solutions to improve the monitoring of subsea cables – particularly during load out and installation. Current available solutions are not able to detect and monitor mechanical cable limits with the required accuracy and therefore by supporting the development of novel monitoring systems there is potential to dramatically improve the reliability of this aspect of offshore wind farm installation.