Power Cable Tape Coating for Insulation Shrink Back
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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 the 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 arranged around the conductor without friction enhancing material, then the structure is simple, but the shrink back of the insulation system occurs due to insufficient friction
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 tape-conductor interface to increase grip and reduce axial movement of the insulation system, directly addressing the shrink back problem without fundamentally altering the overall cable structure.
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 composite structure allows the tape arrangement to maintain its structural function while adding the friction enhancement property, achieving both simplicity and effectiveness in preventing shrink back.
2Reliability
If the friction enhancing material is coated on the whole inner facing surface, then the grip on the conductor is maximized, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by selectively coating only the inner facing surface of the tape arrangement with friction enhancing material, rather than the entire tape structure. This localized application maximizes the friction enhancement where it is most needed (at the conductor interface) while minimizing the complexity and cost of the coating process.
3Stability of the object's composition
If the tape arrangement uses multiple layers, then the axial stability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the tape arrangement into multiple layers, with the first layer having the friction enhancing material coating on its inner facing surface. This layered structure allows each layer to perform specific functions, with the first layer providing friction enhancement and subsequent layers providing structural support, thereby improving axial stability through a systematic division of functions.
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
AI summary
A power cable including: a conductor, an insulation system arranged around the conductor, a tape arrangement forming an interface between the conductor and the insulation system, the tape arrangement having one or several layers of which a first layer has an inner facing surface arranged to face the conductor, wherein the inner facing surface of the first layer of the tape arrangement is coated with friction enhancing material.