Thermochromic Crosslinked Polymer Cable Insulation
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Solution Overview
Problem
Existing temperature detection systems in electrical cables are not optimized, often deteriorating the mechanical and electrical properties of cables and can melt at high temperatures, making them ineffective for detecting abnormal heat rises.
Innovation Solution
An energy and telecommunications cable with a crosslinked polymer layer containing a thermochromic agent that irreversibly changes color at a temperature higher than the crosslinking temperature, allowing for visual detection of malfunctions without damaging the cable's mechanical or electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermochromic element is used to detect temperature rise, then temperature detection capability is improved, but the element melts at high temperatures making it unusable
Solution Approach 1:
The patent changes the chemical structure of the polymer from linear to crosslinked, which fundamentally alters the thermal properties of the material. The crosslinked structure prevents the polymer chains from moving freely and melting, allowing the thermochromic element to maintain its shape and functionality at temperatures above its normal melting point while still undergoing color change at the designated detection temperature.
Solution Approach 2:
The patent creates a composite material by combining a thermochromic agent with a crosslinked polymer matrix. The thermochromic agent provides temperature detection capability through color change, while the crosslinked polymer provides structural integrity and heat resistance. This composite structure allows the element to withstand high temperatures without melting while maintaining its thermochromic detection function.
2Measurement precision
If a thermochromic device is added to detect malfunctions, then detection capability is improved, but the device complexity and size are not optimized
Solution Approach 1:
The patent merges the thermochromic detection function with the cable insulation layer itself. Instead of adding a separate, independent thermochromic device, the thermochromic agent is incorporated directly into the polymer matrix that forms the cable insulation. This integration eliminates the need for separate detection components, optimizing the device structure and reducing overall complexity while maintaining effective malfunction detection capability.
Solution Approach 2:
The patent makes the polymer layer serve multiple functions: it provides electrical insulation, mechanical protection, and temperature detection capability. By incorporating the thermochromic agent into the insulation layer, the same material structure performs both protective and diagnostic functions, eliminating the need for separate dedicated detection devices and optimizing overall device complexity.
3Reliability
If the thermochromic reaction temperature is set high for safety, then cable property preservation is improved, but the response time to detect abnormalities is delayed
Solution Approach 1:
The patent carefully selects and adjusts the thermochromic reaction temperature parameter to be higher than the normal operating temperature but lower than the temperature at which cable damage occurs. This optimized temperature parameter allows the system to maintain cable properties during normal operation while providing timely detection of abnormal temperature rises before they cause damage, achieving both reliability and timely response.
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 enables the preservation of cable properties during temperature rises, allowing for visual identification of abnormalities through color change without causing electrical losses or mechanical damage, with the thermochromic agent changing color at a temperature significantly higher than the cable's operating temperature.
Implementation Method 1
a thermochromic agent capable of irreversibly changing color at a reaction temperature Tat under the action of a temperature increase
Implementation Method 2
at least one crosslinked polymer layer obtained from a crosslinkable polymer composition comprising a polymer and a thermochromic agent
Data Source
AI summary
The present invention relates to a power and/or telecommunication cable comprising an elongated conductive element, characterized in that the elongated conductive element is surrounded by at least one crosslinked polymer layer obtained from a crosslinkable polymer composition comprising a polymer and a thermochromic agent capable of irreversibly changing color at a reaction temperature Tat under the action of a temperature rise.