Nano Composite Insulating Material for Creeping Discharge Prevention
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Solution Overview
Problem
Conventional methods for preventing creeping electrical discharge in high-voltage devices rely on electric field relaxation or increasing the creeping distance, which are not effective without altering the dielectric constant or physical properties of the solid insulating material.
Innovation Solution
Incorporating nanosized inorganic fine particles, such as silica, alumina, or titania, into a resin to form a nano composite insulating material, which disperses these particles within the resin to prevent creeping electrical discharge at the surface of a cured resin product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electric field relaxation methods are used to prevent creeping electrical discharge, then the dielectric constant of the solid insulating material must be decreased, but this alters the physical properties of the material which is not always acceptable
Solution Approach 1:
The invention uses a composite insulating material formed by mixing a thermosetting resin with inorganic fine particles (such as silica, alumina, or titania) having specific surface areas of 50-500 m²/g. This composite structure prevents creeping electrical discharge through the unique properties of the dispersed inorganic particles rather than by altering the overall dielectric constant of the solid material, thus resolving the contradiction between discharge prevention and material property stability
Solution Approach 2:
The invention changes the particle size parameter of the inorganic filler to the nanoscale range (specific surface area 50-500 m²/g), which fundamentally alters the interface properties between the resin and filler particles. This parameter change creates numerous internal interfaces that relax the electric field without requiring changes to the bulk dielectric constant of the solid insulating material
2Reliability
If the creeping distance is increased by providing surface irregularities, then the physical structure of the insulating material must be modified, but this increases device complexity and manufacturing difficulty
Solution Approach 1:
Instead of modifying the surface geometry to increase creeping distance, the invention uses a composite material approach where inorganic fine particles are dispersed throughout the resin matrix. This creates internal electric field relaxation pathways that prevent discharge without requiring complex surface structures or increased creepage distances, thereby avoiding additional device complexity
Solution Approach 2:
The invention replaces the mechanical/geometric approach (surface irregularities to increase path length) with a material science approach (nanoscale composite structure to relax electric field). This substitution eliminates the need for complex surface geometries while achieving the same protective function
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
This approach increases the voltage at which creeping electrical discharge occurs without altering the electric field or physical properties, making it suitable for high-voltage applications like gas insulated switchgear and oil-immersed transformers.
Implementation Method 1
electric field relaxation by means of spatial gradient distribution of dielectric constant
Implementation Method 2
electric field relaxation by means of spatial gradient distribution of dielectric constant
Data Source
AI summary
A method for preventing occurrence of creeping electrical discharge at a resin surface, the method being characterized by including dispersing nanosized inorganic fine particles in a resin, thereby preventing occurrence of creeping electrical discharge at the surface of a cured product of the resin.