Power Cable Interface Tape Coating for Shrink-Back Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power cables experience shrink back due to axial movement of the insulation system relative to the conductor, leading to exposure of the conductor and potential failures.
Innovation Solution
A power cable design featuring a tape arrangement with a friction enhancing material coating on the inner facing surface of the conductor, increasing friction between the conductor and the tape arrangement to mitigate axial shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation system is provided without friction enhancing material, then the manufacturing is simpler and cost is lower, but the shrink back is greater and reliability is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the friction coefficient parameter of the tape arrangement through coating the inner facing surface with friction enhancing material. This changes the physical property of the interface between the insulation system and conductor, increasing friction to counteract thermal shrinkage forces and reduce shrink back, thereby improving reliability without major structural changes.
Solution Approach 2:
The patent uses composite materials by combining the base tape material with friction enhancing material coating on the inner facing surface. This creates a composite structure where the coating layer provides enhanced friction properties while the base tape maintains its structural function, effectively reducing shrink back through material composition enhancement.
2Force
If friction enhancing material coating is applied to the inner facing surface, then the grip on conductor is improved and shrink back is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the friction force parameter by applying friction enhancing material coating to the inner facing surface of the tape arrangement. This modifies the physical property of the contact surface, increasing the friction force between the insulation system and conductor to counteract thermal shrinkage and improve grip on the conductor.
Solution Approach 2:
The patent applies local quality by coating only the inner facing surface of the tape arrangement with friction enhancing material, rather than treating the entire tape structure. This localized application focuses the friction enhancement where it is most needed - at the conductor interface - while minimizing additional manufacturing complexity and material costs.
3Stability of the object's composition
If the friction enhancing material is coated on the whole inner facing surface, then the axial stability is maximized, but the material consumption and cost increase
Solution Approach 1:
The patent applies local quality by selectively coating the inner facing surface of the tape arrangement with friction enhancing material. This localized approach concentrates the friction enhancement at the critical conductor interface where axial stability is most needed, rather than uniformly coating the entire tape structure, thereby optimizing axial stability while minimizing material consumption and cost.
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 friction enhancing material reduces shrink back of the insulation system, enhancing grip and reducing the risk of failures by improving the axial stability of the conductor-insulation interface.
Implementation Method 1
the friction between the conductor, such as an outer facing surface of the conductor, and the tape arrangement can be adapted, and increased compared to having a tape arrangement without such friction enhancing material coating
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A power cable (1) comprising: a conductor (2, 201), an insulation system (5) arranged around the conductor (2, 201), a tape arrangement (30, 130) forming an interface between the conductor (2, 201) and the insulation system (5), the tape arrangement (30, 130) having one or several layers (32, 34, 132) of which a first layer (32, 132) has an inner facing surface (32a, 132a) arranged to face the conductor (2, 201), wherein the inner facing surface (32a, 132a) of the first layer (32, 132) of the tape arrangement (30, 130) is coated with friction enhancing material (33, 133).