XLPE Cable Degassing Evaluation Using Laser Scattering
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Solution Overview
Problem
Existing methods for evaluating the degassing effect of cross-linked polyethylene cables suffer from low accuracy due to sensitivity limitations and variability in test conditions, which can compromise the reliability and efficiency of the production process.
Innovation Solution
A method involving a hollow cross-linked polyethylene cable sample with an insulating layer, heated to transparency, irradiated with a monochromatic laser under controlled conditions to capture light spot images, with data normalization and calculation of a degassing uniformity coefficient to assess degassing effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If partial discharge detection is used to evaluate degassing effect, then the evaluation can be performed, but the sensitivity is limited and accuracy is reduced
Solution Approach 1:
The patent replaces the electrical measurement method (partial discharge detection) with an optical measurement method (laser scattering detection). By using laser light scattering to detect micropore physical defects directly, the system achieves higher measurement precision and sensitivity without being affected by test condition variations that limit electrical detection methods.
2Reliability
If longer degassing time is used, then cross-linking by-products are discharged more completely, but production efficiency is reduced and delivery cycle is extended
Solution Approach 1:
The patent performs preliminary evaluation of degassing effect using the laser scattering method during or immediately after the degassing process. By detecting micropore defects in real-time or near-real-time, the system determines whether degassing is sufficient without requiring extended waiting periods, thus maintaining reliability while improving production efficiency and delivery cycle.
3Reliability
If higher degassing temperature is used, then degassing effect is improved, but the cable may become soft and extruded
Solution Approach 1:
The patent implements a feedback mechanism where the laser scattering method continuously monitors the degassing effect by detecting micropore defects. Based on this feedback information, the degassing temperature and time can be dynamically adjusted to achieve sufficient degassing while preventing excessive temperature that would cause cable softening and extrusion, thus maintaining both degassing effect and structural integrity.
4Productivity
If shorter degassing time or lower temperature is used, then production efficiency is improved, but degassing effect is insufficient and insulation performance is unqualified
Solution Approach 1:
The patent replaces traditional electrical testing methods with optical laser scattering detection that can quickly and accurately assess degassing effectiveness by detecting micropore defects. This substitution enables rapid evaluation that confirms sufficient degassing with shorter times and lower temperatures, thereby improving production efficiency while ensuring insulation performance quality.
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
This method efficiently and accurately evaluates the degassing effect by quantifying physical defects, enhancing production reliability and efficiency by providing a higher accuracy assessment of the degassing process.
Implementation Method 1
acquiring at least one light spot image of the transparent to-be-tested cable sample formed by irradiation under a monochromatic laser light source
Data Source
AI summary
A method for evaluating a degassing effect of a cross-linked polyethylene cable, includes: acquiring a cable sample to be detected; heating the cable sample to be detected; under a darkroom condition, acquiring at least one light spot image of said transparent cable sample under irradiation of a monochromatic laser light source; extracting light intensity data of the at least one light spot image in a preset light spot image range; normalizing the light intensity data, and obtaining the maximum value and an average value of normalized light intensity coefficients of said transparent cable sample in a preset thickness range of the insulating layer; calculating a degassing uniformity coefficient according to the maximum value and the average value; and obtaining an evaluation result of the degassing effect of the cross-linked polyethylene cable according to the maximum value, the average value, and the degassing uniformity coefficient.