Cold Shrinkable Termination With Integrated Stress Control Glue
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Solution Overview
Problem
Existing cold shrinkable termination products for middle and low-voltage electric power cables have high manufacturing costs and complex structures, and some types do not comply with technical regulations in certain countries, limiting their applications.
Innovation Solution
A method involving a cold shrinkable termination assembly with an insulation tube, stress control glue, and a support tube, where the stress control glue is coated on the inner wall of the insulation tube, and the tube is expanded onto the support tube before being fitted over the electric power cable, eliminating the need for a stress control cone and silicone oil, thus simplifying the structure and reducing costs while ensuring compliance with regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double layers of stress control material are used, then local electric field concentration is prevented, but manufacturing cost increases and structure becomes complicated
Solution Approach 1:
The patent combines the stress control function and insulation function into a single integrated stress control insulation tube, eliminating the need for separate stress control glue and stress control tube layers. This merging reduces structural complexity while maintaining the electric field control functionality through the cold shrinkage mechanism of the single tube structure.
Solution Approach 2:
The stress control insulation tube performs multiple functions simultaneously: it provides stress control to prevent electric field concentration, provides insulation, and uses its cold shrinkage capability to create a secure fit. This multi-functionality eliminates the need for multiple separate components, reducing both structure complexity and manufacturing cost.
2Reliability
If stress control cone and silicone oil are used, then stress control is achieved, but manufacturing cost increases and structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates the stress control cone and silicone oil filling agent from the traditional two-component system. Instead, it uses a single stress control insulation tube with cold shrinkage capability that inherently provides both stress control and sealing functions without requiring additional components.
Solution Approach 2:
The stress control insulation tube acts as an intermediary component that replaces both the stress control cone and silicone oil. Its cold shrinkage properties enable it to perform the stress control function traditionally requiring a cone, while its material properties provide the sealing function traditionally requiring silicone oil, thereby simplifying the overall structure.
3Reliability
If traditional cold shrinkable termination is used, then electric field concentration is controlled, but compliance with technical regulations is compromised
Solution Approach 1:
The patent changes the material parameters and structural parameters of the termination component to achieve regulatory compliance. By using a single integrated stress control insulation tube with specific cold shrinkage ratios and material properties, the design meets the technical regulations of various countries while maintaining effective electric field control capabilities.
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 method results in a cost-effective, simplified cold shrinkable termination assembly that prevents local electric field concentration and meets relevant technical regulations, enhancing market applicability and electrical performance.
Implementation Method 1
removing the support tube from the insulation tube such that the insulation tube shrinks on the exposed end of the electric power cable
Data Source
AI summary
A method of manufacturing a cold shrinkable termination for an electric power cable that includes an insulation tube and stress control glue. An electric power cable is provided having an exposed end including: a conductor core having an exposed portion and an unexposed portion; an insulation layer having an exposed portion and an unexposed portion covering the unexposed portion of conductor core; a semi-conductive shield layer having an exposed portion and an unexposed portion covering the unexposed portion of the insulation layer; a metal shield layer having an exposed portion and an unexposed portion covering the unexposed portion of the semi-conductive shield layer; and an outer protection layer covering the unexposed portion of the metal shield layer. A cold shrinkable termination is provided including: an insulation tube; a stress control glue; and, a support tube. The stress control glue is coated along a selected segment of an inner wall of the insulation tube. The insulation tube of the cold shrinkable termination is expanded on the support tube. The exposed end of the electric power cable is inserted into the support tube, and the support tube is removed from the insulation tube such that the insulation tube shrinks on the exposed end of the electric power cable. Thereby, the structure of the cold shrinkable termination is simplified and the cost thereof is reduced.