Tin-Alloy Cable Joint Barrier for Lead-Free Moisture Sealing
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Solution Overview
Problem
Conventional power cables use lead as a radial water barrier, which is toxic and environmentally harmful, necessitating the development of alternative materials for cable joints that maintain mechanical and electrical properties while avoiding increased outer diameters and environmental issues.
Innovation Solution
The use of tin or tin alloys as the water barrier material in cable joints, which can be in the form of welded, extruded, or laminate structures, and are joined to existing water barriers using welding, soldering, or adhesives, with reinforcement layers for added stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead is used as water barrier material, then effective moisture protection is achieved, but toxicity and environmental harm occur
Solution Approach 1:
The patent changes the material parameter from lead to tin or tin alloys, maintaining the protective function while eliminating toxicity. Tin provides similar malleability and water barrier properties without the environmental harm of lead.
Solution Approach 2:
The patent uses tin alloys (such as Sn-Cu, Sn-Sb, or Sn-Bi) instead of pure tin or lead, combining multiple metals to achieve optimal balance of malleability, strength, and environmental compatibility for water barrier applications.
2Object-generated harmful factors
If alternative materials replace lead, then environmental issues are resolved, but mechanical and electrical properties may deteriorate
Solution Approach 1:
The patent carefully selects tin alloy compositions and processing parameters to match the mechanical properties of lead, ensuring equivalent reliability in cable joint applications while maintaining environmental compatibility.
Solution Approach 2:
The patent ensures homogeneous material properties throughout the water barrier layer by controlling alloy composition and processing, maintaining consistent mechanical and electrical performance across the cable assembly.
3Adaptability or versatility
If cable sections are joined by means of a joint, then cable assembly is enabled, but the joint may become a weak link with different mechanical and electrical properties
Solution Approach 1:
The patent uses the same tin or tin alloy material for both the water barrier layers of cable sections and the joint water barrier, ensuring homogeneous properties throughout the entire assembly and eliminating the joint as a weak link with different characteristics.
Solution Approach 2:
The patent integrates the joint water barrier seamlessly with the cable section water barriers using welding, soldering, or adhesive bonding, creating a continuous protective barrier that maintains uniform mechanical and electrical properties across the entire cable assembly.
4Ease of manufacture
If joint water barrier uses different material than cable sections, then manufacturing flexibility is improved, but material compatibility and bonding reliability may worsen
Solution Approach 1:
The patent recommends using the same material for joint and cable section water barriers to ensure compatibility and reliable bonding, while still allowing manufacturing flexibility through the choice of joining methods (welding, soldering, or adhesive).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a non-toxic, environmentally friendly water barrier that maintains the mechanical and electrical integrity of power cables, ensuring effective moisture protection without increasing the joint's outer diameter, suitable for both land and submarine applications.
Implementation Method 1
the joint water barrier is joined to the first water barrier and to the second water barrier by welding, soldering or by an adhesive
Implementation Method 2
the joint water barrier is joined to the first water barrier and to the second water barrier by welding, soldering or by an adhesive
Data Source
Figure 1~2
Figure 3~4b
Figure 4c~4d
AI summary
The present invention relates to power cables comprising a joint with a metallic water barrier and in particular, metallic water barrier materials for cable joints for use in high voltage cables for both land and submarine applications.