Compressed Stranded Conductor Structure for Strand Inversion Control
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Solution Overview
Problem
Existing methods for manufacturing compressed stranded conductors fail to effectively prevent strand inversion and breakage, even when using multiple split compression processes.
Innovation Solution
A compressed stranded conductor with a central stranded wire and an outer circumferential stranded wire, where the composite stranded wire is compressed to an occupancy ratio of 90.2% to 91.0%, reducing the likelihood of strand inversion and breakage by controlling the compression ratios through specific die areas and material weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high compression ratio is applied to prevent strand inversion, then strand inversion is reduced, but strand breakage occurs
Solution Approach 1:
The conductor is divided into a central stranded wire and an outer circumferential stranded wire with different compression ratios. The central wire is compressed to 96-98% occupancy ratio while the outer wire is compressed to 92-94% occupancy ratio, preventing strand inversion in the central region without over-compressing the outer strands that would cause breakage.
Solution Approach 2:
Different regions of the composite stranded wire are given different compression characteristics. The central stranded wire receives higher compression (96-98% occupancy ratio) to prevent inversion, while the outer circumferential stranded wire receives lower compression (92-94% occupancy ratio) to prevent breakage, optimizing each region's compression level according to its specific requirements.
2Manufacturing precision
If multiple split compression processes are used to prevent strand inversion, then strand inversion is reduced, but the process complexity increases and strand breakage still occurs
Solution Approach 1:
The compression process is segmented by applying different compression ratios to different spatial regions (central vs. outer) rather than applying multiple sequential compression steps to the entire conductor. This single-step differential compression achieves strand inversion prevention while simplifying the overall process compared to multiple split compression operations.
3Productivity
If outer circumferential strands are compressed to high occupancy ratio, then overall compression efficiency is improved, but outer strands break due to excessive compression
Solution Approach 1:
The outer circumferential stranded wire is assigned a specific occupancy ratio range (92-94%) that is lower than the central wire's compression ratio. This local optimization prevents outer strand breakage while maintaining sufficient compression efficiency for the overall conductor 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
The proposed solution significantly reduces the occurrence of strand inversion and breakage by maintaining the occupancy ratio within the specified range, ensuring the structural integrity of the conductor.
Implementation Method 1
a composite stranded wire configured by the central stranded wire and the outer circumferential stranded wire is compressed, and an occupancy ratio of the composite stranded wire is 90.2% or more and 91.0% or less
Data Source
AI summary
A compressed stranded conductor includes a central stranded wire having a plurality of conductive strands which are twisted together and an outer circumferential stranded wire having a plurality of conductive strands which are twisted together at an outer circumference of the central stranded wire. A composite stranded wire configured by the central stranded wire and the outer circumferential stranded wire is compressed, and an occupancy ratio of the composite stranded wire is 90.2% or more and 91.0% or less.