Subsea Power Cable Buffer Layer for Lead-Free Water Barriers
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Solution Overview
Problem
Current subsea power cables rely on lead for water barriers, which are heavy, costly, and environmentally hazardous, and alternatives like high-resistance metallic screens fail in high-voltage testing and short-circuit scenarios.
Innovation Solution
A method involving a subsea power cable structure with a buffer layer made of polymer-based liquid material with a viscosity of at least 1000 mPa·s, supporting a lead-free water barrier layer, which is less prone to deformation and fatigue, and can be hardened for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead is used as water barrier material, then reliability of water protection is improved, but weight increases significantly and environmental harm worsens
Solution Approach 1:
The patent changes the material parameters by transitioning from lead to lead-free alternatives (such as aluminum or copper alloys), thereby reducing density and weight while maintaining the water barrier function through equivalent or improved protective properties
Solution Approach 2:
The patent employs composite structures combining multiple materials (lead-free metal layers, polymer coatings, corrosion-resistant alloys) to achieve both light weight and reliable water protection, where each material contributes specific properties that compensate for the absence of lead
2Reliability
If lead is used as water barrier material, then water protection is improved, but environmental harm increases
Solution Approach 1:
The patent extracts and removes the harmful lead component from the water barrier system, eliminating the source of environmental pollution while retaining the essential water protection function through alternative materials
Solution Approach 2:
The patent changes the material composition parameters by substituting toxic lead with environmentally benign materials, thereby eliminating harmful factors while maintaining protective reliability
3Strength
If lead is used as water barrier material, then structural strength is improved, but fatigue resistance worsens
Solution Approach 1:
The patent uses composite material systems combining lead-free metals with polymer layers and corrosion-resistant coatings, where the composite structure provides both structural strength and improved fatigue resistance through the synergistic properties of different materials
Solution Approach 2:
The patent applies different material properties to different parts of the water barrier system, with lead-free metals providing structural strength and polymer or coating layers providing fatigue resistance and corrosion protection
4Weight of moving object
If high-resistance metallic screen is used as alternative to lead, then weight is reduced, but reliability in high-voltage testing deteriorates
Solution Approach 1:
The patent combines lightweight metallic screens with additional protective layers (polymers, corrosion-resistant coatings, or alternative metal alloys) to compensate for the reduced high-voltage performance of the metallic screen alone, achieving both weight reduction and reliable electrical performance
Data Source
AI summary
A method of manufacture for a subsea power cable (100), includes the step of providing at least one cable core (125) having an electrical conductor (110) and an electrically insulating system (120) arranged radially outside of the electrical conductor (110). The method includes adding a liquid material having a polymer, on top of the at least one cable core (125), forming a buffer layer (130); and applying a water barrier (140) radially outside of the buffer layer (130).