Dry-Type Cable Termination Using Composite Insulator
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Solution Overview
Problem
Existing dry-type HV cable terminations face issues with reliability, mechanical resistance, need for auxiliary insulators, and are heavy, making them difficult to install and prone to leakage, moisture absorption, and seismic vulnerabilities.
Innovation Solution
A dry-type power cable termination design featuring a tubular support structure with an insulator made of a non-metallic composite material, an elastomeric stress cone, and a metal electrode, eliminating the need for insulating fluids and allowing for easy on-site assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porcelain or composite insulator filled with fluid insulating material is used, then electrical insulation is improved, but reliability deteriorates due to leakage and moisture absorption risks
Solution Approach 1:
The patent removes the fluid insulating material filling from the insulator, transitioning from a fluid-filled design to a dry-type design. This extraction eliminates the harmful effects of leakage and moisture absorption associated with fluid fillings while maintaining electrical insulation through the solid composite material structure.
2Reliability
If a dry-type termination with silicone premoulded body is used, then reliability is improved by eliminating fluid filling, but device complexity increases due to required support structures
Solution Approach 1:
The patent combines the support function and the insulator body into a single integrated composite structure. The non-metallic composite material simultaneously provides mechanical support and electrical insulation, eliminating the need for separate support structures and reducing mounting complexity.
Solution Approach 2:
The insulator made of non-metallic composite material serves multiple functions: it provides electrical insulation, mechanical support, and structural integrity all in one component. This multi-functionality reduces the number of separate parts and simplifies the overall device complexity.
3Strength
If an epoxy resin insulator is used, then mechanical strength is improved, but weight increases making installation difficult
Solution Approach 1:
The patent employs non-metallic composite materials that provide high mechanical strength-to-weight ratio. These composite materials offer superior strength compared to traditional materials while being significantly lighter, facilitating easier handling and installation during cable termination.
4Strength
If an epoxy resin insulator is used, then mechanical strength is improved, but reliability deteriorates due to fragility and low seismic resistance
Solution Approach 1:
The non-metallic composite materials used in the insulator provide both high mechanical strength and superior flexibility compared to brittle epoxy resins. This combination enables the insulator to withstand seismic forces and impacts while maintaining structural integrity, thereby improving reliability under extreme conditions.
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 design provides enhanced safety in explosive and seismic events, improved mechanical resistance, and easier installation, while being lighter and free from insulating fluids, ensuring reliable operation.
Implementation Method 1
an insulator support made of a non-metallic composite material having a tensile modulus of at least 11 GPa
Implementation Method 2
the insulator support is made of a non-metallic composite material having a tensile modulus of at least 11 GPa
Implementation Method 3
an elastomeric stress cone housed in the frustoconical portion in direct contact thereto
Implementation Method 4
an insulating body at least partially externally covering and directly contacting the support structure
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure relates to a dry-type cable termination (1) comprising: - a tubular support structure (2) comprising: - an insulator support (18) comprising a frustoconical portion (19), wherein the insulator support (18) is made of an electrically insulating non-metallic composite material having a tensile modulus of at least 11 GPa; and - a screen tube (32); - an insulating body (17) at least partially externally covering and directly contacting the support structure (2); - an elastomeric stress cone (23) housed in the frustoconical portion (19) and in direct contact to the frustoconical portion (19); - an electrode (7), housed within the screen tube (32), connected with the stress cone (23) and in electric contact with the screen tube (32).