Metal-Dielectric Earthing Switch Flange for Outdoor Durability
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Solution Overview
Problem
Existing insulated earthing switches in gas insulated switchgear assemblies have limited resilience and environmental durability, particularly in outdoor applications, due to mechanical resistance issues with plastic insulators.
Innovation Solution
The earthing switch incorporates a metallic insulator flange with a dielectric insulating layer, mechanically connected to the switchgear housing, enhancing mechanical resistance and durability through anodic oxidation of the metallic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic material insulator is used for the earthing switch, then electrical insulation is achieved, but mechanical resistance and environmental durability are limited
Solution Approach 1:
The insulator flange is constructed as a composite structure combining a metallic body (aluminum or aluminum alloy) with a dielectric insulating layer (anodization layer or ceramic coating). This composite material provides both the mechanical strength of metal and the electrical insulation properties of dielectric materials, resolving the contradiction between mechanical resistance and electrical insulation.
2Reliability
If a plastic material insulator is used, then electrical insulation is provided, but the insulator may break and has limited resilience to outdoor applications
Solution Approach 1:
The metallic body undergoes surface treatment through anodization or ceramic coating, fundamentally changing the surface parameters to create a dielectric insulating layer. This parameter change transforms the metallic surface into an electrically insulating surface while preserving the underlying mechanical strength of the metal, enabling resilience to outdoor applications.
3Reliability
If a plastic material insulator is used, then the earthing switch can be manufactured, but it has limited environmental durability and recycling difficulty
Solution Approach 1:
The metallic insulator flange can be easily removed from the earthing switch assembly and recycled through standard metal recycling processes. The metallic material (aluminum or aluminum alloy) maintains its recyclability while the dielectric layer can be stripped or left on the surface, significantly improving environmental durability and ease of recycling compared to plastic materials.
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 higher resilience and environmental durability, preventing breakage and enabling easy recycling, while maintaining electrical insulation.
Implementation Method 1
an insulator flange (16) comprising a metallic body (30) and a dielectric insulating layer (31) on the metallic body (30)
Implementation Method 2
enhancing mechanical resistance and durability through anodic oxidation of the metallic body
Data Source
AI summary
The application concerns an air insulated or mixed air and gas insulated switchgear assembly including a switchgear and an earthing switch. The switchgear includes a switchgear housing. The earthing switch includes a switch housing. The earthing switch includes an insulator flange including a metallic body and a dielectric insulating layer on the metallic body. The switch housing is mechanically connected to the switchgear housing through the insulator flange.