Portable Polymer Indentation Testing for In-Situ Cable Aging
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Solution Overview
Problem
Existing polymer cable monitoring technologies are inadequate for non-destructive, in-situ assessment of aging due to limitations in portability, flexibility of parameter control, and inability to accurately measure visco-elastic properties, particularly for materials like irradiated PVC and thermally aged XLPE.
Innovation Solution
A portable polymer tester (PPT) that measures visco-elastic properties through indentation, including specific compressive stiffness and deformation recovery time, with programmable parameters and a controllable indenter probe, capable of operating on live electrical equipment and in various orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional polymer cable aging monitoring methods are used, then measurement capability is provided, but the methods are destructive and require large sample sizes
Solution Approach 1:
The patent replaces traditional destructive mechanical testing methods with a portable indentation testing system that uses controlled mechanical compression to assess polymer aging. The system measures stiffness and recovery time through non-destructive indentation, eliminating the need for large sample sizes and destructive sampling while providing accurate aging indicators.
Solution Approach 2:
The patent changes the measurement parameters from traditional destructive tests to indentation-based stiffness and recovery time measurements. By using these specific parameters, the system can assess polymer aging without destroying the sample, allowing for non-destructive monitoring that requires minimal sample material.
2Ease of operation
If portable testing equipment is developed, then on-site monitoring capability is achieved, but device complexity increases
Solution Approach 1:
The patent divides the testing system into modular components including a portable indentation device, separate control electronics, and interchangeable probe assemblies. This segmentation allows the system to be compact and portable while maintaining functional complexity, enabling on-site monitoring without requiring a bulky integrated system.
Solution Approach 2:
The patent designs the portable tester with interchangeable probes and adjustable parameters that can accommodate different polymer types and testing requirements. This multi-functionality reduces the need for multiple specialized devices, thereby managing complexity while providing versatile on-site monitoring capability.
3Object-affected harmful factors
If non-destructive testing methods are used, then sample integrity is preserved, but measurement precision may be reduced
Solution Approach 1:
The patent incorporates feedback mechanisms where the indentation system measures stiffness and recovery time, then uses this data to calculate aging indicators. The system provides real-time feedback on polymer condition, allowing for precise non-destructive assessment by continuously monitoring and analyzing the mechanical response of the polymer material.
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
Provides accurate, non-destructive, and portable monitoring of polymer cable aging, enabling effective prediction of remaining life and optimizing maintenance schedules.
Implementation Method 1
a drive system for advancing the probe to contact and deform the polymer jacket of the cable, said drive system comprising a motor and a linear slide; and a force/displacement measurement system including a mechanism for measuring force at the tip of said probe during contact with said polymer jacket
Implementation Method 2
The visco-elastic properties are used as an indicator of polymer age and degradation. The method and device of the present disclosure measures stiffness (measurement of force and displacement) of polymeric material, as well as the time taken by the polymeric material to recover a set portion of the initial deformation.
Implementation Method 3
indenting polymer material, such as cable insulation or cable jacket material, to generate indentation and post-indentation parameters that characterize the visco-elastic properties of the polymer material tested
Implementation Method 4
the testing device may comprise a heater configured to heat a test location of the polymeric or elastomeric material to a set temperature
Data Source
AI summary
A portable testing device and method for measuring physical characteristics of a polymeric or elastomeric material is provided. The testing device includes an indenter probe; a drive system for controlling movement of said probe, said drive system comprising a motorized linear slide operatively associated with the probe to advance said probe from a first position to a second position to deform said polymeric or elastomeric material and to facilitate instant or fast retraction of said probe to a predetermined intermediate position between said first and second positions; and a force/displacement measurement system including a first sensor for measuring force at the tip of said probe during contact with said polymeric or elastomeric material and a second sensor for measuring displacement of the probe; and a controller configured to provide control to the force/displacement measurement system and the drive system.