Welded Aluminum Conductor Joints for Low-Resistance Cable Accessories
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Solution Overview
Problem
High power cables experience overheating due to poor contact resistance, especially in prefabricated cable joints and terminations, leading to breakdowns and financial damage, which is exacerbated by the intrinsic properties of aluminum conductors and inadequate manufacturing techniques.
Innovation Solution
A method involving the electrical welding of conductors followed by the placement of a metal sleeve between the welded conductor and the cable insulation to minimize air traps and enhance contact, reducing the risk of overheating by creating an ideal contact point with improved oxidation and mechanical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional connection methods (e.g., ferrule connectors) are used for aluminum conductors, then the assembly is easier to manufacture, but contact resistance increases leading to overheating
Solution Approach 1:
The patent replaces mechanical connection systems (ferrule connectors, compression joints) with welding technology to join aluminum conductors. This substitution eliminates the mechanical contact interface that causes high contact resistance and overheating, creating a metallurgical bond with superior electrical and thermal conductivity while maintaining ease of manufacture through automated welding processes.
Solution Approach 2:
The patent changes the fundamental connection parameter from mechanical contact to metallurgical fusion through welding. This parameter change transforms the contact resistance from high (mechanical) to low (metallurgical), eliminating overheating issues while preserving manufacturing efficiency through standardized welding procedures for aluminum conductors.
2Weight of moving object
If aluminum conductors are used in high power cables, then weight and cost are reduced, but contact resistance increases causing overheating
Solution Approach 1:
The patent applies welding technology specifically to aluminum conductors to replace mechanical connection systems. This resolves the inherent problem of aluminum's oxide layer and softness that cause poor mechanical contacts, while preserving aluminum's advantages of low weight and cost-effectiveness for high power cable applications.
3Ease of operation
If mechanical connectors are used for conductor connections, then installation is simpler, but oxidation and poor electrical contact occur
Solution Approach 1:
The patent replaces mechanical connectors with welding to eliminate oxidation-related contact resistance problems. The welded joint creates a continuous metallurgical bond that is immune to oxidation, providing superior electrical contact while maintaining operational simplicity through standardized welding procedures.
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 method effectively reduces or eliminates overheating in high voltage cable accessories by improving contact resistance and mechanical stability, ensuring reliable operation and preventing financial losses associated with cable failures.
Implementation Method 1
electrically connecting the first and second conductors by welding them together
Data Source
Figure 1a~2
Figure 3a~4
Figure 5
AI summary
A method is disclosed for connecting a first and a second conductor for use in a prefabricated cable accessory. The method comprises electrically connecting the first and second conductors by welding them together and filling a space between an outer surface of the welded conductor and an outer surface of a cable insulation of the first and second conductors by arranging a metal sleeve therebetween.