Hybrid Electric Cable Mechanical and EMI Shielding
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Solution Overview
Problem
Existing hybrid electric cables for land transport, particularly for railway network switches, lack effective protection against mechanical damage and electromagnetic interference, and do not efficiently simplify the equipping process or reduce costs.
Innovation Solution
A hybrid electric cable design featuring a common outer sheath with multiple power and data transmission cables, a steel mechanical protection screen of specific thickness, an insulating material layer, a laminated aluminum layer for electromagnetic shielding, and a plastic retaining sheet, which provides protection against shocks and rodent damage while ensuring efficient data transmission and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common outer sheath with multiple power and data cables is used, then the equipping of multiple switches is simplified and costs are reduced, but the cable lacks effective protection against mechanical damage and electromagnetic interference
Solution Approach 1:
The cable employs a composite protective structure consisting of multiple layers: an outer sheath, a steel wire mesh screen for mechanical protection, and an aluminum foil layer for electromagnetic shielding. This multi-material composite approach simultaneously provides robust mechanical strength and effective electromagnetic interference protection while maintaining the integrated cable design that simplifies installation.
Solution Approach 2:
The protective elements are nested within the cable structure: the steel wire mesh screen is positioned inside the outer sheath, and the aluminum foil layer is nested within the steel screen. This nested arrangement allows multiple protective functions to be integrated within a compact structure, providing both mechanical and electromagnetic protection without significantly increasing the cable's external dimensions.
2Strength
If a steel mechanical protection screen is added, then protection against shocks and rodent damage is improved, but the cable structure becomes more complex
Solution Approach 1:
The steel wire mesh screen is constructed as a flexible protective layer that can be integrated into the cable structure without requiring rigid enclosures. The mesh format provides mechanical strength and rodent protection while maintaining flexibility for cable bending and installation, thereby reducing structural complexity compared to rigid protective housings.
Solution Approach 2:
The combination of steel wire mesh for mechanical protection and aluminum foil for electromagnetic shielding creates a composite protective system where each layer performs its specific function. This division of protective functions into specialized layers simplifies the design of each individual component while providing comprehensive protection overall.
3Object-affected harmful factors
If an aluminum layer for electromagnetic protection is added, then electromagnetic interference protection is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The aluminum foil layer is applied as a thin flexible film within the cable structure, which can be integrated during the cable extrusion or assembly process. This thin-film approach provides effective electromagnetic shielding without requiring thick metal layers or complex assembly steps, thereby minimizing impact on manufacturing simplicity.
Solution Approach 2:
The aluminum foil layer is nested within the steel wire mesh screen, allowing both protective layers to be integrated in a single cable manufacturing process. The nested structure enables sequential application of protective layers during production, streamlining the manufacturing process rather than requiring separate assembly operations.
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 cable effectively protects against mechanical and electromagnetic interference, simplifies the equipping of multiple switches with a single cable, reducing installation costs and enhancing reliability by providing redundant data transmission and power supply capabilities.
Implementation Method 1
a layer of common conductive material for electromagnetic protection... Preferably, said layer of common electromagnetic shielding conductive material is made of aluminum
Implementation Method 2
at least one common screen of steel for mechanical protection... This common screen has the function of protecting the cables from damage that may be caused by shocks or attacks by rodent animals
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a hybrid electrical system comprising, within a common outer sheath (1), at least two power cables (2, 3) and at least two data transmission cables (4, 5), having a common layer of conductive material for electromagnetic shielding. According to the invention, at least one common mechanical shielding screen (7) is further disposed beneath said outer sheath.