Insulating Composition with Hollow Sphere Fillers
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Solution Overview
Problem
Conventional insulation in high voltage devices is complex, with varying electrical, thermal, and mechanical properties, making it difficult to predict performance and prone to partial discharges due to structural defects, which can lead to catastrophic failure.
Innovation Solution
A method involving a dielectric resin mixed with filler particles, such as hollow spheres and varistor materials, is used to create a uniform void array within the insulation layer, enhancing resistance to partial discharges by orienting close-packed directions obliquely relative to the electric field and incorporating varistor particles to manage charge accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation components (enamel, tapes, resin) are used, then insulation is provided, but the system becomes complicated and performance becomes difficult to predict
Solution Approach 1:
The patent combines multiple insulation functions into a single composite material by incorporating filler particles (such as hollow spheres and varistor materials) within a resin matrix. This merging of components eliminates the need for separate enamel, tapes, and resin layers, simplifying the insulation system while maintaining predictable performance through controlled material composition.
Solution Approach 2:
The invention creates a composite insulation material consisting of a resin base material combined with specifically designed filler particles. The composite structure allows for tailored electrical, thermal, and mechanical properties, making performance predictable while reducing system complexity compared to conventional multi-component insulation systems.
2Reliability
If traditional insulation materials are used, then insulation is provided, but partial discharges occur at structural defects leading to catastrophic failure
Solution Approach 1:
The patent incorporates varistor particles among the filler materials to convert the harmful effect of electrical stress into a beneficial protective mechanism. The varistor particles suppress partial discharges by providing non-linear electrical characteristics that limit voltage breakdown, thereby converting potential failure points into protective elements that enhance insulation reliability.
Solution Approach 2:
The invention utilizes hollow sphere filler particles to create a controlled porous structure within the insulation material. This porous configuration reduces the dielectric constant difference between defects and surrounding material, minimizing impedance variations and suppressing partial discharge initiation at structural defects.
3Manufacturing precision
If filler particles are mixed with liquid resin, then uniform void array is formed, but mixing uniformity is difficult to achieve
Solution Approach 1:
The patent controls the mixing process by adjusting parameters such as resin viscosity, filler particle size distribution, and mixing speed to achieve uniform dispersion. By optimizing these parameters, the invention enables consistent void array formation without requiring excessively complex mixing equipment or procedures.
Solution Approach 2:
The invention employs extended mixing time and multiple mixing stages to ensure complete and uniform distribution of filler particles within the resin. This partial or excessive action approach guarantees mixing uniformity, achieving the required void array consistency while maintaining practical manufacturability.
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 significantly increases the voltage drop required to initiate partial discharges by more than 50% and enhances the overall resistance to electrical breakdown, improving the reliability and longevity of high voltage insulation.
Implementation Method 1
The resin can be partially cured, say, through the application of thermal energy, for example, so as to form a semisolid
Implementation Method 2
the resin can be fully cured by exposing the resin to a fourth temperature less than the second temperature
Data Source
AI summary
A method is provided that includes providing a resin in liquid form. The resin can be partially cured, and subsequent to partially curing the resin, the resin can be mixed with filler particles. The resin and filler particles can be mixed, say, in a planetary mixer, and can be exposed to an ambient pressure less than atmospheric pressure during mixing. Subsequent to mixing the resin and filler particles, the resin can be fully cured. The fully-cured resin can be disposed between first and second conductive components configured to be maintained at different potentials, such as between a phase conductor and a ground conductor.