Cable Sheath Damage Detection via Oxygen-Reactive Indicator
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Solution Overview
Problem
Existing cables are difficult to inspect for damage, particularly to the sheath, which can lead to safety issues and potential fires, as damage to the sheath may not be easily detectable, especially in bent or clamped areas.
Innovation Solution
A cable with an integrated indication material that reacts with oxygen upon damage, either by swelling or releasing a visible or odorant signal, allowing for easy detection of sheath damage, with the material arranged either outside or inside the sheath and potentially mixed with the sheath itself, and protected by a neutral outer layer to prevent premature exposure to air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable is covered by a sheath to protect inside conductors, then the cable's protection and reliability are improved, but the detectability of damage to the sheath deteriorates
Solution Approach 1:
The patent applies color changes by incorporating indication material with a color contrasting to the sheath. When the sheath is damaged, the indication material becomes visible through the sheath or escapes from the cable, providing a visual signal of damage. This resolves the contradiction by maintaining the protective sheath while enabling easy damage detection through color contrast.
Solution Approach 2:
The indication material acts as an intermediary between the sheath and the observer. It is positioned within the cable structure such that its presence or escape indicates sheath integrity. This mediator enables damage detection without compromising the sheath's protective function, as the indication material can be detected through the intact sheath or upon its failure.
2Device complexity
If indication material is arranged inside the sheath, then the cable structure is simplified, but the indication material may prematurely contact air and false alarms may occur
Solution Approach 1:
The patent applies nesting by placing the indication material inside the sheath, with the sheath acting as a protective container. This nested structure ensures the indication material remains isolated from air until the sheath is actually damaged, preventing false alarms while maintaining structural simplicity. The sheath serves as both protection and containment.
Solution Approach 2:
The indication material is pre-positioned within the cable structure in a controlled environment. By arranging it inside the sheath during manufacturing, the system ensures the material only contacts air when the sheath is compromised, eliminating the need for additional protective barriers and maintaining structural simplicity while ensuring indication accuracy.
3Difficulty of detecting and measuring
If indication material is arranged outside the sheath, then damage detection is enhanced, but the cable structure becomes more complex and the indication material may be exposed to environmental factors
Solution Approach 1:
The patent applies merging by integrating the indication material with the sheath structure, either embedded within or closely associated with it. This combination enhances damage detectability as the indication material moves with the sheath and is clearly visible upon damage, while avoiding the complexity of separate protective systems. The indication material becomes part of the sheath's functional structure.
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
Enhances workplace safety by facilitating easy detection of cable damage, potentially extending inspection intervals and reducing costs by ensuring early identification of issues before they lead to safety hazards.
Implementation Method 1
the indication material may be formed so that it escapes from the cable, if it gets into contact with the ambient air and reacts with the oxygen contained therein. For example in the case of contact with oxygen, the indication material can swell and, thus, escape from the cable
Data Source
AI summary
The invention relates to a cable with a sheath and an indication material that in case of damaging of the sheath at least partially escapes from the cable.