Overhead Conductor Segmentation for Sag Control
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Solution Overview
Problem
Existing methods for installing and repairing overhead high-voltage cables and catenary lines face challenges due to sagging issues caused by temperature increases, leading to reduced clear height or low tension, particularly with gap conductors which complicate installation and repair.
Innovation Solution
A method involving the use of clamping pieces and stoppers spaced along the conductor to immobilize the core and sheath, allowing for easier installation and repair by distributing tension differences over shorter lengths, enabling installation in unlimited lengths and simplifying the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gap conductors are used to prevent cable sagging, then the clear height and tension are maintained, but the installation time is extended and repair becomes complicated
Solution Approach 1:
The conductor is divided into multiple segments with intermediate fixing points along its length. These fixing points create separate tension zones that can be independently managed, allowing the conductor to maintain proper clear height and tension without requiring complex gap conductor structures. The segmentation enables simpler installation and repair procedures.
2Reliability
If gap conductors are used to maintain tension, then the conductor performance is improved, but the repair complexity increases significantly
Solution Approach 1:
By dividing the conductor into segments with intermediate fixing points, the system isolates tension maintenance to specific zones. When repair is needed, only the affected segment between two fixing points requires attention, dramatically reducing repair complexity compared to gap conductors where the entire structure must be considered.
Solution Approach 2:
The fixing points create localized zones where tension is controlled and maintained. Each segment between fixing points has consistent tension characteristics, allowing for standardized repair procedures and simplifying the repair process while maintaining overall conductor performance.
3Length of moving object
If the conductor length is increased to cover longer distances, then the coverage area is expanded, but the cable sagging problem worsens
Solution Approach 1:
The long conductor is divided into multiple shorter effective segments by introducing intermediate fixing points. Each segment maintains proper tension and clear height independently, allowing the overall conductor to span long distances without sacrificing clear height performance. This enables extended coverage while preventing sagging through distributed support points.
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 allows for efficient installation and repair of conductors, reducing installation time, eliminating the complexity associated with gap conductors, and limiting the length of cable replacement, while maintaining tension and height requirements.
Implementation Method 1
the tension difference between the core and the sheath of the conductor is split over shorter lengths of the cable
Data Source
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AI summary
A method for positioning a conductor for an overhead energy transport, the obtaining of a conductor with an elongate core and an elongate sheath situated around the elongate core. The method comprises the step of fixing the elongate sheath to the elongate core at a position which is not at the ends of the conductor, by means of at least one clamping piece.