Elastomer Field Grading Electrode for Switchgear
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Solution Overview
Problem
Existing field grading electrodes in low, medium, and high voltage switchgears, typically made of metallic materials, are not optimal for situations requiring flexibility and resilience, especially when used on moving conductor parts, as they lack the necessary springing functionality and require complex joining mechanisms.
Innovation Solution
A conductive or semiconductive field grading electrode made of elastomer or thermoplastic materials, such as silicone or EPDM, which can be flexible, resilient, and assembled directly onto conductors without additional joining mechanisms, providing both field grading and springing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metallic field grading electrodes are used, then field grading function is achieved, but flexibility and resilience are lost
Solution Approach 1:
The patent changes the material parameter from metallic to elastomeric/thermoplastic, which fundamentally alters the mechanical properties to include flexibility and resilience while maintaining electrical conductivity through conductive fillers or structures within the polymer matrix
Solution Approach 2:
The field grading electrode is constructed as a composite material combining elastomeric or thermoplastic base material with conductive components (such as carbon black, metal particles, or conductive polymers), achieving both mechanical flexibility and electrical conductivity in a single integrated structure
2Ease of manufacture
If metallic field grading electrodes are used, then field grading function is achieved, but assembly complexity increases
Solution Approach 1:
The patent merges the field grading function with the structural support function into a single component. The elastomeric field grading electrode simultaneously provides electrical field homogenization, mechanical flexibility, and direct mounting capability, eliminating the need for separate joining mechanisms
Solution Approach 2:
The elastomeric material inherently provides both the field grading function and the mechanical attachment function through its elasticity and resilience, allowing it to self-adjust and self-mount onto conductors without requiring additional fastening components or complex assembly procedures
3Manufacturing precision
If field grading electrode is made rigid, then field strength control is improved, but adaptability to moving parts is reduced
Solution Approach 1:
The patent transitions from a static rigid structure to a dynamic elastomeric structure that can deform and adapt its shape while maintaining its field grading function. The material's elastic properties allow it to accommodate movement and deformation of conductors while continuously providing field homogenization
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 elastomer or thermoplastic field grading electrodes offer a compact, easy-to-assemble solution that reduces the need for additional parts and assembly time, while providing effective field homogenization and withstanding switching operations, including piercing and sparking.
Implementation Method 1
Field grading electrodes are used to homogenize the electrical field within the switchgear, such as across insulating gas distances. The field grading electrodes reduce the maximum field strength in areas of sharp edges or tips
Implementation Method 2
at least one portion of the elastomer or thermoplastic is flexible. at least one portion of the elastomer or thermoplastic is resilient. at least a part of the field grading electrode is configured to deform elastically during switching operation
Data Source
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AI summary
The invention relates to a field grading electrode for a low, medium or high voltage switchgear. The field grading electrode is configured to be assembled to a conductor of a low, medium or high voltage switchgear. The field grading electrode comprises an elastomer or thermoplastic. The field grading electrode is conductive or semiconductive.