Stranded Composite Tensile Member for Flexible Overhead Cables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional overhead transmission cables with carbon fiber-reinforced composite central tensile members suffer from insufficient flexibility, reduced tensile strength due to heat degradation, and increased manufacturing costs, leading to sagging issues and reduced transmission capacity.
Innovation Solution
A central tensile member with a stranded wire layer made of carbon fiber-reinforced plastic and a binding layer of heat-resistant tape, designed to maintain tensile strength and flexibility, featuring a specific pitch and fill factor to prevent sagging and corrosion, while minimizing weight and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a carbon fiber-reinforced composite is used in the central tensile member to reduce sag and increase transmission capacity, then the tensile strength is improved, but the flexibility is insufficient reducing wiring workability
Solution Approach 1:
The central tensile member is divided into multiple wire strands (7 strands of 7 wires each) arranged in a hierarchical structure. This segmentation allows the rigid carbon fiber-reinforced composite to be divided into flexible segments that can bend and conform during installation, improving wiring workability while maintaining overall tensile strength through the composite material properties.
2Power
If the number of conductor wires is increased to increase transmission capacity, then the transmission capacity is improved, but the manufacturing cost increases
Solution Approach 1:
The patent uses a composite central tensile member combining carbon fiber reinforcement with a thermosetting resin matrix having high heat resistance. This allows the cable to maintain structural integrity at elevated temperatures, enabling higher transmission capacities without increasing the number of conductor wires, thereby reducing manufacturing costs associated with additional conductors.
3Temperature
If the glass transition temperature of the resin matrix is increased to improve heat resistance, then the tensile strength is maintained under heat stress, but the flexibility is reduced
Solution Approach 1:
The patent selects a thermosetting resin matrix with a glass transition temperature of 140°C or higher, which provides sufficient heat resistance to maintain tensile strength at operating temperatures. The resin is applied in a controlled manner to ensure proper curing and maintain the flexibility of the wire layer while achieving the required thermal performance.
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 provides excellent sag properties, improved wiring workability, and reduced weight and manufacturing costs by maintaining tensile strength and flexibility, even under heat stress, thus enhancing the transmission capacity and reliability of overhead transmission cables.
Implementation Method 1
a wire layer in which a plurality of wires including a carbon fiber-reinforced plastic that includes a carbon fiber in a thermosetting resin matrix is stranded
Implementation Method 2
a binding layer surrounding the wire layer, wherein the plurality of wires forming the wire layer are stranded in a predetermined direction, and wherein a pitch of the stranded wires is 100 to 500 times an outer diameter of the wire layer
Data Source
AI summary
The present disclosure relates to a flexibility-improved central tensile member for an overhead transmission cable, and an overhead transmission cable including the same. In particular, the present disclosure relates to a flexibility-improved central tensile member for an overhead transmission cable, and an overhead transmission cable including the same, wherein the central tensile member has excellent tensile strength and thus has excellent sag properties preventing the wired overhead transmission cable from sagging, and has sufficient flexibility and thus improves wiring workability. Moreover, the central tensile member can suppress corrosion and damage to a conductor wire arranged around the central tensile member and thus can eliminate or minimize an increase in resistance of the overhead transmission cable, as well as a resultant reduction in transmission capacity, and makes it possible to reduce weight and manufacturing costs of the overhead transmission cable.