Composite Hanger Wire for Railway Overhead Lines
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Solution Overview
Problem
Current drop wires for high-speed railway lines face challenges in achieving a balance between high mechanical strength, fatigue resistance, and electrical conductivity without increasing weight, which is crucial for maintaining constant contact with the overhead contact wire and preventing power interruptions.
Innovation Solution
A hanger wire design combining copper or copper alloys with a steel core, where the steel core is coupled with a copper or alloy layer through high-pressure and high-temperature solid-state bonding, creating a metallurgical bond that enhances mechanical strength and fatigue resistance while maintaining high electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper or copper alloys are used for hanger wires, then electrical conductivity is improved, but mechanical strength and fatigue resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining copper wires (providing electrical conductivity) with steel core wires (providing mechanical strength and fatigue resistance). The hanger wire consists of multiple strands, each comprising a copper wire and a steel core wire, creating a composite structure that simultaneously achieves high electrical conductivity and mechanical strength.
2Strength
If steel is used for hanger wires, then mechanical strength is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent uses composite materials where steel core wires provide the necessary mechanical strength and fatigue resistance, while copper wires wrapped around or combined with the steel cores provide the required electrical conductivity. This composite approach allows the hanger wire to simultaneously achieve both mechanical strength and electrical conductivity.
3Strength
If wire diameter is increased to improve mechanical strength, then strength is improved, but weight increases
Solution Approach 1:
The patent employs composite materials where the steel core provides high strength-to-weight ratio, allowing the hanger wire to achieve the required mechanical strength with a smaller overall diameter compared to using copper alone. This reduces the weight while maintaining or improving mechanical strength.
4Strength
If copper/magnesium alloy is used, then fatigue strength is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent applies composite materials where the steel core wire provides the required fatigue strength, while the copper wire provides high electrical conductivity. This combination allows the hanger wire to simultaneously achieve both fatigue strength and electrical conductivity, overcoming the limitations of copper/magnesium alloys.
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 hanger wires with improved mechanical and fatigue strength, flexibility, and electrical conductivity, reducing the risk of power interruptions and maintaining efficient energy transmission without increasing the overall weight of the overhead line.
Implementation Method 1
the steel core is coupled with a copper or alloy layer through high-pressure and high-temperature solid-state bonding, creating a metallurgical bond
Implementation Method 2
first wires made from copper or an alloy thereof combined with second wires consisting of a steel core coupled with a layer made from copper or an alloy thereof
Data Source
AI summary
A hanger wire for contact wires of railway electrical lines may include: first wires including copper or a first alloy of copper; and second wires including a steel core coupled with a layer of copper or a second alloy of copper. An overhead contact line suitable to transmit electric power to a locomotive may include: at least one conductor element connected to a high voltage electric energy distribution network; at least one suspension wire fastened to a series of supporting poles arranged along the overhead contact line; and a plurality of hanger wires connecting the at least one conductor element to the at least one suspension wire. The hanger wires may include: first wires including copper or a first alloy of copper; and second wires including a steel core coupled with a layer of copper or a second alloy of copper.