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INTER-ARRAY CABLES


FEATURE SPONSOR


PIONEERS IN THE DEVELOPMENT OF INTER-ARRAY CABLES FOR OFFSHORE WIND


We introduce JDR Cables as sponsors of our Inter-Array Cables feature.


As Editor I had the pleasure of interviewing three of their technical team…


• Peter Worrall - Technical Services Director • Stephen Ingham - Lead Analysis Team Leader • Caroline Lourie - Senior Analysis Engineer


KNOWLEDGE AND COMMITMENT


The first thing that strikes you is the level of knowledge and commitment – we do come across this many times in engineering generally but in this case it was palpable.


This introduction to the company and what it stands for will be relatively brief from myself preferring to concentrate on the work


they do – you will therefore find a ‘storyboard’ on the subject area of ‘The importance of technical cable analysis’ following this introduction.


FOLLOW-UP ARTICLES


This is not the end of the story however as we will be drilling down more deeply in follow-up editions regarding all of the important work JDR Cables carries out in the wind energy industry including…


• The concept of minimising risk prior to a project commencing • Experience in the Oil & Gas industry and lessons learned • The company’s strong technical function and consideration given to developing a separate department


• Bringing in projects on time and on budget • Relevant extracts from the technical information received


The importance of technical cable analysis WHY PERFORM ANALYSIS?


Analysis performed at the FEED stage can allow cable product design optimisation, considering: • Installation loading and requirements for bend stiffeners and restrictors to protect the cable;


• Project specific factors such as total product length and weight for optimal storage and transportation;


• Requirements for stability on the seabed and the most cost effective means of achieving this;


GLOBAL FEA – SYSTEM LEVEL ANALYSIS OF CABLE / UMBILICALS FOR: • System design configuration optimisation, considering buoyancy and tethering


• Extreme event analysis to ensure product will not be mechanically compromised


• Fatigue analysis to ensure product will last intended lifetime


• Clashing / interference analysis to assess potential impact of other lines / structures in proximity.


• Fatigue lifetime endurance and resilience to operational lifetime extreme storm conditions.


• Optimising power core size wrt CAPEX material costs vs OPEX cable heating losses


• Any issues identified at FEED stage can be accommodated at detailed design stage in a much more timely and cost effective way than can be done at the project execution stage.


Installation pull in analysis


LOCAL FEA – COMPONENT LEVEL ANALYSIS OF CABLE / UMBILICAL CROSS SECTION: • Thermal analysis for heat losses produced by power cores, for cable rating limitations


• Electromagnetic analysis for environmental impact, identifying levels for detection of buried cables and electrical interference / cross talk between cables in close proximity


• Component level stress analysis to determine


Floating wind turbine


Monopile cable entry


Thermal analysis of multiple cables


60 www.windenergynetwork.co.uk


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