Sealing Tape for Oil-Impregnated Cable Joints
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Solution Overview
Problem
Existing sealing technologies for cable joints with paper-insulated lead cables face issues such as oil migration, leakage due to pressure changes, and complexity in assembly, especially in field conditions, where the need for heat sources poses safety risks and complicates the process.
Innovation Solution
A sealing tape with an inner deformable oil barrier layer resistant to chemical attack and oil migration, combined with an outer rigid tape that forms a protective sleeve, allowing for a single-step application without heat, ensuring a secure and flexible seal against mechanical stress and oil expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid casing with multiple seals is used to prevent oil migration, then oil leakage prevention is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The sealing function is divided into two distinct layers: an inner deformable layer providing the oil barrier, and an outer rigid layer providing structural protection. This segmentation allows each layer to specialize in its function without requiring a complex multi-component seal system.
Solution Approach 2:
The sealing tape combines a deformable oil-resistant material (inner layer) with a rigid protective material (outer layer) into a single composite structure. This composite design integrates both sealing and structural functions in one component, eliminating the need for multiple separate seals and casing elements.
2Reliability
If a heat-recoverable sleeve is used to prevent oil migration, then oil leakage prevention is improved, but the need for heat sources increases safety risks and complicates field assembly
Solution Approach 1:
The deformable inner layer automatically conforms to the cable joint geometry and provides sealing without requiring external heat activation or specialized installation equipment. The material self-adjusts to provide the seal, eliminating the need for heat sources and complex assembly procedures.
Solution Approach 2:
The sealing mechanism relies on the deformable material's ability to change its physical parameters (shape, density) through simple mechanical compression during wrapping, rather than requiring thermal parameter changes. This allows activation at ambient temperatures without heat sources.
3Adaptability or versatility
If a deformable oil barrier is used to allow flexibility, then adaptability to cable movement is improved, but resistance to oil chemical attack and migration may worsen
Solution Approach 1:
The deformable inner layer is specifically formulated with oil-resistant polymers that maintain both flexibility and chemical resistance. The composite structure combines the flexibility needed for cable movement with the chemical stability required to resist oil attack, achieving both properties simultaneously in one material system.
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 provides a quick, simple, and reliable method for sealing cable joints, preventing oil leakage and deformation under pressure, while eliminating the need for additional components or heat sources, thus enhancing safety and reducing assembly time.
Implementation Method 1
a sealing mastic that is resistant to chemical attack from the oil and resistant to migration of the oil there through
Implementation Method 2
The outer layer is provided with a substantially rigid tape that is resistant to deformation and expansion of the inner layer
Data Source
AI summary
A cable joint includes at least two cables each having inner conducting elements. At least one of the cables has a layer of paper insulation impregnated with an oil. The inner conducting elements of the cables are secured to each other at a junction. A sealing tape has an inner layer and an outer layer. The sealing tape is wrapped about the junction such that the inner layer is in contact with the cables. The inner layer is provided with a deformable oil barrier including a sealing mastic that is resistant to chemical attack from the oil and resistant to migration of the oil there through. The outer layer carries the inner layer. The outer layer is provided with a substantially rigid tape that is resistant to deformation and expansion of the inner layer that forms a protective sleeve about the inner layer.