Cable Laminate Water Barrier for Charge Conduction and Sealing
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Solution Overview
Problem
Current water barriers for high-voltage power cables are heavy due to lead usage, have low fatigue resistance, and pose environmental concerns, while also failing to effectively conduct capacitive charges, leading to potential electrical breakdown.
Innovation Solution
A lightweight, fatigue-resistant water barrier is created by wrapping a laminate structure comprising a metal foil and thermoplastic polymer around the cable core, with strategically uncovered areas allowing the metal foil to act as an electrically conductive bridge, and thermally joining the layers to enhance sealing and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead is used as water barrier material, then reliable water protection is achieved, but weight increases significantly
Solution Approach 1:
The patent uses a composite laminate structure consisting of multiple layers including polymer layers (such as polyethylene or polypropylene) combined with metal foil layers (such as aluminum or steel). This composite approach provides effective water barrier protection while significantly reducing weight compared to solid lead construction.
Solution Approach 2:
The patent employs thin film metal layers integrated into a flexible laminate structure, replacing traditional thick lead sheathing. The thin film provides adequate water protection when combined with polymer layers, achieving weight reduction while maintaining barrier functionality.
2Reliability
If lead is used as water barrier material, then water protection is achieved, but fatigue resistance decreases
Solution Approach 1:
The laminate structure combines polymer layers with metal foil layers, where the polymer provides flexibility and fatigue resistance while the metal foil provides water barrier properties. This composite approach overcomes the low fatigue resistance of solid lead.
Solution Approach 2:
The patent changes the material parameters by using thin metal foil layers (reducing thickness from traditional lead) combined with polymer matrices, fundamentally altering the mechanical properties to achieve both water protection and improved fatigue resistance.
3Object-generated harmful factors
If lead is replaced with environmentally friendly materials, then environmental impact is reduced, but electrical conductivity for capacitive charges may be compromised
Solution Approach 1:
The laminate structure combines electrically conductive metal foil layers (such as aluminum or steel) with non-conductive polymer layers. The metal foil layers provide the necessary electrical conductivity for capacitive charge conduction, while the polymer layers provide environmental friendliness and water barrier properties.
Solution Approach 2:
The patent applies local quality by having conductive metal foil layers positioned at specific locations within the laminate structure where electrical conductivity is needed, while other layers use non-conductive environmentally friendly polymers. This localized approach ensures capacitive charge conduction capability while maintaining overall environmental friendliness.
4Weight of moving object
If lightweight materials are used instead of lead, then weight is reduced, but water barrier reliability may decrease
Solution Approach 1:
The patent uses composite laminate structures where multiple polymer layers and metal foil layers work together to provide water barrier effectiveness equivalent to or exceeding traditional lead, while achieving significant weight reduction.
Solution Approach 2:
The patent merges the water barrier functions of multiple materials (polymers and metal foils) into a single laminate structure, where each layer contributes to the overall water protection, achieving reliability comparable to solid lead but with reduced weight.
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
The solution effectively conducts capacitive charges and provides a durable, lightweight water barrier that prevents electrical breakdown, reducing weight and environmental impact while maintaining excellent water insulation.
Implementation Method 1
the laminate structure is thermally joined by a heat treatment
Implementation Method 2
the metal foil is able to function as an electrically conducive bridge carrying capacitive charges across the water barrier
Data Source
AI summary
A laminate structure having a metal foil having a lower and an upper surface area, a first layer of a thermoplastic polymer laid onto and covering the lower surface of the layer of metal foil except for a longitudinal uncovered surface area of the layer of metal foil, and a second layer of thermoplastic polymer laid onto and covering the upper surface of the layer of metal foil except for a longitudinal uncovered surface area of the layer of metal foil, and wherein the laminate structure is wrapped around the cable core such that the first uncovered surface area of the metal foil faces the cable core and the second uncovered surface area of the metal foil faces away from the laminate structure, and the laminate structure is thermally joined by a heat treatment.