Mold-Free Cable Junction Assembly Using Expandable Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electric power cable joints, particularly those at medium and high voltage, are inflexible and prone to cracks or tears due to their one-piece nature, requiring multiple manufacturing for different applications and needing pre-greasing of cables, limiting adaptability and durability.
Innovation Solution
A method involving assembly steps without molding, using expandable electrodes on removable support tubes, applying electrical fluid substances, and a retractable sleeve to create a versatile joint that can adapt to various cable constraints and voltages, avoiding cracks and eliminating pre-greasing needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If molding is used to manufacture cable junctions, then the junction structure is fixed and obtained as a one-piece unit, but this causes cracks or tears between layers and reduces adaptability to different cable sections and voltages
Solution Approach 1:
The junction is divided into separate components (electrode, fluid substance layers, shrink sleeve) that can be manufactured independently and assembled together, replacing the traditional one-piece molded structure. This segmentation allows each component to be optimized for its specific function while enabling adaptability to different cable configurations.
Solution Approach 2:
The assembled junction structure can be adapted to different cable sections and voltage levels by adjusting the dimensions and properties of individual components, particularly the shrink sleeve and fluid substance layers, making a single design suitable for multiple applications rather than requiring separate molded junctions for each scenario.
2Ease of manufacture
If molding is used to manufacture cable junctions, then the junction is obtained as a one-piece unit, but this increases the risk of cracks or tears between layers during installation and handling
Solution Approach 1:
By dividing the junction into separate components that are assembled rather than molded as one piece, the structure eliminates weak points where cracks would form between layers. Each component maintains its structural integrity independently, and the assembly process creates strong interfaces between components.
Solution Approach 2:
The use of cold-shrinkable materials that undergo controlled dimensional changes during assembly, rather than being forced into a molded shape, reduces mechanical stress and prevents cracking. The materials are applied in a relaxed state and then contract to their final dimensions, avoiding the high stresses of injection molding.
3Adaptability or versatility
If traditional molded junctions are used, then multiple junction types must be manufactured for different applications, but this increases manufacturing complexity and inventory requirements
Solution Approach 1:
A single set of component types (electrode, fluid substance, shrink sleeve) can be configured for different applications by varying dimensions, material properties, and assembly parameters, eliminating the need to manufacture and store multiple specialized junction designs for different cable sections and voltages.
Solution Approach 2:
The junction components, particularly the shrink sleeve, possess dynamic properties that allow them to adapt to different cable sizes and configurations through controlled shrinking, replacing the need for static, application-specific molded junctions with a single dynamic design that can be adjusted as needed.
4Ease of operation
If molded junctions are used, then pre-greasing of cables is required before installation, but this adds installation steps and potential points of failure
Solution Approach 1:
The fluid substance with electrical properties is pre-applied to the electrode during manufacturing, creating a self-contained assembly that eliminates the need for separate pre-greasing steps during installation. The electrode arrives at the installation site already prepared with its lubricating and electrical interface layer.
Solution Approach 2:
The functions of the electrode and the lubricating/electrical interface layer are merged into a single integrated component assembly, where the fluid substance is permanently applied to the electrode during manufacturing. This combination eliminates the need for separate installation steps for applying grease and installing the electrode.
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 allows for adaptable, durable electric power cable joints that can handle different voltage ranges and cable sections without cracking, enhancing mechanical stability and reducing manufacturing complexity while eliminating the need for pre-greasing.
Implementation Method 1
the electrode is cold shrinkable
Implementation Method 2
This material is advantageous because it offers the shrink sleeve elongation properties as well as the ability to resume its initial shape after removal of the removable support tubes
Data Source
Figure 1~2
AI summary
This method of manufacturing a junction between two power electrical cables includes mold-free assembly steps consisting of: expanding (10) an electrode over two removable support tubes; applying (12) to the electrode at least one layer of fluid substance having electrical properties; disposing (14) of a shrink sleeve around the electrode and at least one layer of fluid substance.