Nonlinear Resistance Layer on Insulating Spacer Creepage Surface
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Solution Overview
Problem
Existing gas insulation shutoff apparatuses face reduced dielectric strength due to metal foreign substance adhesion on insulating spacers, requiring increased size or complex shapes to maintain insulation, which hinders compactification and cost reduction.
Innovation Solution
Incorporating a nonlinear resistance layer on the creepage surface of the insulating spacer in high-field areas to prevent dielectric breakdown, without increasing the spacer's size or complexity, by using a material with increased conductivity above a threshold electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating spacer is increased in size or made more complex in shape to extend the creeping distance, then the insulating performance against metal foreign substance adhesion is improved, but the device size and structural complexity increase, hindering compactification and cost reduction
Solution Approach 1:
The invention changes the electrical parameter of the creepage surface by applying a nonlinear resistance layer. This layer has low resistance under normal electric fields but exhibits high resistance when the electric field exceeds a threshold value, thereby preventing metal foreign substance adhesion without requiring increased spacer size or complex shapes.
Solution Approach 2:
The invention uses a composite structure combining the insulating spacer material with a nonlinear resistance layer coating. This composite approach provides both the mechanical insulation function and the electrical field-dependent resistance function, solving the adhesion problem without increasing overall device complexity.
2Reliability
If the insulating spacer is increased in size to reduce the creeping electric field, then the dielectric strength against metal foreign substance adhesion is improved, but the device compactification is hindered
Solution Approach 1:
The nonlinear resistance layer changes the electrical resistance parameter dynamically based on the electric field strength. When the electric field exceeds the threshold value (e.g., 70% of breakdown field), the layer's resistance increases significantly, preventing further field concentration and metal foreign substance adhesion, thereby maintaining dielectric strength without increasing apparatus volume.
3Reliability
If a barrier structure section is formed integrally with the insulating spacer to surround the high-voltage conductor, then metal foreign substance adhesion is suppressed, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the protective function from a separate barrier structure and integrates it into a thin nonlinear resistance layer coating on the insulating spacer surface. This layer provides the same protection against metal foreign substance adhesion without requiring a bulky integral barrier structure, thereby reducing device complexity.
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 nonlinear resistance layer enhances dielectric strength against metal foreign substance adhesion, maintaining insulation performance while allowing for compact and cost-effective designs of gas insulation shutoff apparatuses.
Implementation Method 1
a nonlinear resistance layer provided on a creepage surface of the insulating structure. The nonlinear resistance layer is provided in a portion to be a high-field portion of the creepage surface of the insulating structure
Implementation Method 2
the metal foreign substance is charged by an electric field generated during operation and receives electrostatic force in a frying direction from the bottom surface of the grounded container, and moves within the container
Data Source
AI summary
An insulating spacer and a gas insulation shutoff apparatus each having a high dielectric strength against adhesion of a metal foreign substance are provided without increasing size or complicating a shape of the insulating spacer. In an insulating spacer of a gas insulation shutoff apparatus including a grounded tank filled with an insulating gas, a high-voltage conductor provided within the grounded tank, and the insulating spacer supporting and fixing the high-voltage conductor within the grounded tank, the insulating spacer includes a conductor to be connected to the high-voltage conductor, an insulating structure supporting and fixing the conductor within the grounded tank, and a nonlinear resistance layer provided on a creepage surface of the insulating structure, and the nonlinear resistance layer is provided in a portion to be a high-field portion of the creepage surface of the insulating structure.