HV Cable Insulation Surface Profilometry for Reliable Jointing
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Solution Overview
Problem
Current methods for inspecting the surface quality of high voltage cable insulation layers are user-dependent and non-standardized, often requiring destructive sampling and failing to accurately represent the total insulation surface area, leading to potential performance issues in cable joints and terminations.
Innovation Solution
Utilizing portable optical profilometry to measure the surface roughness of cable insulation layers on-site, comparing the measured values to preselected reference values, and preparing the surface as needed to ensure acceptable quality before jointing or termination, using methods like peeling and stripping tools to expose the insulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection with human eye is used, then ease of operation is improved, but measurement precision and reliability deteriorate
Solution Approach 1:
The patent replaces the mechanical/visual inspection system with an optical measurement system. A portable optical profilometer uses optical principles (light reflection and interference) to automatically measure surface roughness parameters (Ra, Rz values), eliminating subjective human visual assessment and providing standardized, precise, and objective measurements of cable insulation surface quality.
2Measurement precision
If sampling method is used, then measurement precision is improved, but reliability deteriorates due to destructive sampling and limited representation
Solution Approach 1:
The patent extracts only the necessary measurement information (surface roughness parameters) from the cable insulation surface using optical profilometry, without removing or damaging any material. This non-destructive approach allows repeated measurements at multiple locations, providing comprehensive representation of the entire insulation surface quality while maintaining cable integrity and joint reliability.
3Measurement precision
If portable optical profilometry is used, then measurement precision and reliability are improved, but device complexity increases
Solution Approach 1:
The patent employs a portable optical profilometer that integrates multiple functions into a single device: surface roughness measurement, automatic data processing, and on-site inspection capabilities. This multi-functional instrument combines optical measurement components, digital processing, and user interface elements, enabling comprehensive surface quality assessment without requiring multiple separate tools or complex measurement procedures.
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
Ensures reliable, standardized, and non-destructive inspection of cable insulation surfaces, preventing poor performance by ensuring smooth transitions and maintaining the integrity of the insulation system, with full traceability and improved longevity of cable accessories.
Implementation Method 1
measuring the surface roughness of the obtained uncovered insulation layer surface by optical profilometry
Data Source
AI summary
A method is provided for preparing an uncovered insulation layer surface of an end section of a cable using optical profilometry, the uncovered insulation layer surface having an advantageous low roughness, a method for jointing two cables. A method is also provided for preparing a termination assembly on a cable, a cable end, a joint and a termination assembly.