Resin-Filled Cable Joint With Thermal Expansion Decoupling
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Solution Overview
Problem
Existing cable joints used in high-voltage power applications face issues with thermal expansion, leading to damage of the resin and shell due to high temperatures, which can result in catastrophic failures and power outages.
Innovation Solution
Incorporating a motion promotor, such as compressible foam elements or gas bubbles, within the curable resin or as a separate component in the shell, to allow for expansion and contraction of cable ends, thereby decoupling them from the shell and reducing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cable ends are rigidly fixed in the shell, then mechanical strength and structural stability are improved, but thermal expansion damage occurs at high temperatures
Solution Approach 1:
The patent introduces a motion promotor that enables dynamic adjustment of the cable end position within the shell. This allows the cable ends to expand and contract thermally while maintaining secure mechanical connection, resolving the contradiction between rigid fixation and thermal expansion accommodation.
Solution Approach 2:
The motion promotor changes the mechanical parameter of cable end position from fixed to variable, allowing positional adjustment in response to temperature changes. This parameter change enables the system to adapt to thermal expansion while maintaining structural integrity.
2Reliability
If cable ends are allowed to move freely, then thermal expansion is accommodated, but mechanical connection strength deteriorates
Solution Approach 1:
The motion promotor provides controlled movement capability rather than free movement. It allows thermal expansion while maintaining sufficient mechanical connection through the anchoring mechanism, thus preserving both thermal accommodation and connection strength.
Solution Approach 2:
The motion promotor acts as an intermediary element between the cable ends and the shell, mediating the interaction between thermal expansion forces and mechanical connection requirements. It transfers and distributes forces to maintain connection strength while accommodating movement.
3Object-affected harmful factors
If resin is used to fill and protect the cable connection, then protection against external influences is improved, but thermal expansion causes resin damage
Solution Approach 1:
The motion promotor enables dynamic positioning of cable ends within the resin-filled shell, allowing thermal expansion to occur without creating excessive stress on the resin. This maintains resin integrity while preserving protective enclosure.
Solution Approach 2:
The motion promotor provides beforehand cushioning by allowing controlled movement space for thermal expansion before resin damage can occur. This preventive mechanism protects the resin from thermal stress damage.
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 motion promotor effectively absorbs thermal expansion, reducing the likelihood of damage to the resin and shell, maintaining the integrity of the cable joint and preventing failures.
Implementation Method 1
cable ends become so hot that the associated thermal expansion of the cable ends and/or the connection between them damages the resin and shell
Implementation Method 2
The motion promotor may comprise at least one compressible medium, to provide the expansion space by compressibility of said at least one compressible medium
Data Source
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AI summary
The invention relates to a cable joint for mutually connecting a first cable end and a second cable end, the cable joint comprising a shell defining a hollow interior space, into which the first cable end and the second cable end can extend in order to be mutually connected within the hollow interior space. The hollow interior space is fillable with a curable resin. According to the invention, the cable joint further comprises at least one motion promotor, for allowing the first and/or second cable end to expand and/or contract with respect to the shell after curing of said resin. The invention also relates to a resin for use in such a cable joint, which comprises at least one motion promotor.