Composite Core Transmission Line Sag and Tension Control
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Solution Overview
Problem
The high cost of advanced overhead electrical power transmission conductors with aluminum matrix composite cores limits their use to only specific sections where reduced sag is required, and existing technologies struggle to integrate different conductors with varying thermal expansion coefficients and densities in a tension section without clearance violations.
Innovation Solution
Designing a dead-end-to-dead-end overhead electrical power transmission line tension section with sequential subsections having different thermal expansion coefficients and densities, allowing for the use of both composite and steel core conductors, ensuring calculated tensions remain within ±5% of each other over a temperature range of 20° C. to 75° C., while maintaining distinct sag values to avoid clearance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher-cost composite core conductors are used, then ampacity and sag reduction are improved, but cost increases
Solution Approach 1:
The patent applies local quality by using composite core conductors only in specific spans where reduced sag is required, rather than uniformly across the entire tension section. This allows the high-performance material to be placed strategically where it provides the most benefit, while using more economical steel core conductors in other spans, thereby resolving the contradiction between performance improvement and cost increase.
Solution Approach 2:
The patent segments the tension section into multiple spans, each potentially using different conductor types. This segmentation allows independent optimization of each span based on specific requirements, enabling the system to achieve overall performance goals while controlling costs by applying expensive materials only where necessary.
2Adaptability or versatility
If different conductor constructions are used in a tension section, then flexibility and targeted performance improvement are improved, but integration complexity increases
Solution Approach 1:
The patent implements local quality by assigning different conductor constructions to different spans based on specific performance requirements. Each span can be optimized independently for its particular needs while maintaining compatibility within the overall tension section, thus achieving flexibility without excessive integration complexity.
Solution Approach 2:
The patent manages integration of different conductor types by controlling key parameters such as sag, tension, and clearance. By adjusting these parameters for each conductor type and ensuring they meet minimum performance criteria, the system achieves versatility while maintaining manageable integration complexity through parameter-based coordination.
3Temperature
If conductors with different thermal expansion coefficients are used, then tailored thermal performance is improved, but tension uniformity becomes difficult to maintain
Solution Approach 1:
The patent addresses tension uniformity by carefully selecting and adjusting parameters such as initial tension, span length, and conductor configuration for each span. By controlling these parameters, the system accommodates different thermal expansion coefficients while maintaining acceptable tension uniformity across the tension section, thus resolving the contradiction between tailored thermal performance and tension stability.
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 approach enables the use of higher-cost conductors where needed, increasing ampacity and reducing sag, while ensuring operational stability and maintaining necessary clearances across varying temperatures, allowing for flexible and efficient power transmission.
Implementation Method 1
the first overhead electrical power transmission conductor tension subsection has a first coefficient of thermal expansion and a first density, wherein the second overhead electrical power transmission conductor tension subsection has a second coefficient of thermal expansion and a second density, wherein at least one of the first and second coefficients of thermal expansion or the first and second densities, at temperatures in the range from 20° C. to 75° C. are different
Data Source
AI summary
Dead-end-to-dead-end overhead electrical power transmission line with composite (e.g., aluminum matrix composite) core overhead electrical power transmission conductor tension subsection and another, different core overhead electrical power transmission conductor tension subsection.