DC Cable Insulation Nanofiller Light Transmittance
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Solution Overview
Problem
The inspection of foreign materials in the insulation layer of direct-current power cables is challenging due to light scattering by crystallized base resin and inorganic fillers, which reduces visible light transmittance and hinders effective inspection.
Innovation Solution
A resin composition for the insulation layer comprising a cross-linked polyethylene base resin and inorganic fillers with a mean volume diameter of 80 nm or less, where the filler's surface includes aminosilyl groups or hydrophobic silyl groups, improving light transmittance and insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic filler is added to the resin composition to suppress leakage current, then electrical insulation performance is improved, but light transmittance decreases making foreign material inspection difficult
Solution Approach 1:
The patent changes the particle size parameter of the inorganic filler to 80 nm or less (nanoscale), which fundamentally alters the light interaction mechanism. At this scale, the fillers no longer scatter visible light significantly, maintaining high light transmittance (70% or more) while preserving the electrical insulation benefits of inorganic filler addition.
Solution Approach 2:
The patent creates a composite resin composition combining cross-linked polyethylene base resin with surface-modified nanoscale inorganic fillers. The surface modification with aminosilyl or hydrophobic silyl groups enhances the composite's electrical properties and dispersion, achieving both improved insulation performance and maintained optical transparency for inspection purposes.
2Stability of the object's composition
If inorganic filler is added to suppress space charge accumulation, then insulation stability is improved, but light scattering increases reducing visibility for inspection
Solution Approach 1:
The patent applies parameter change by reducing inorganic filler particle size to the nanoscale (80 nm or less), which shifts the scattering regime from Mie scattering (for larger particles) to Rayleigh scattering (for nanoparticles). This results in dramatically reduced light scattering and high light transmittance (70% or more) while maintaining the space charge suppression capability essential for insulation stability.
3Reliability
If conventional inorganic filler is used, then leakage current suppression is achieved, but foreign material detection becomes difficult due to reduced light transmittance
Solution Approach 1:
The patent changes the critical parameter of inorganic filler particle size to 80 nm or less, transforming the material's optical properties. This nanoscale reduction enables the filler to suppress leakage current through electrical field modification while remaining optically transparent to visible light, allowing foreign material inspection with light transmittance of 70% or more.
Solution Approach 2:
The patent introduces surface-modified nanoscale inorganic fillers as an intermediary substance that mediates between the conflicting requirements of electrical performance and optical transparency. These modified fillers interact with the resin matrix and electrical fields to provide insulation benefits while their nanoscale size and surface modification ensure minimal light scattering, enabling optical inspection.
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 enhances visible light transmittance to 70% or more, facilitating easier inspection of foreign materials and improving the insulation layer's electrical properties by suppressing light scattering and space charge accumulation.
Implementation Method 1
at least a part of a surface of the inorganic filler includes an aminosilyl group having an amino group
Implementation Method 2
a cross-linked base resin containing polyethylene
Data Source
AI summary
A resin composition molded article forming an insulation layer of a direct-current power cable, including: a cross-linked base resin containing polyethylene, and an inorganic filler having a mean volume diameter of 80 nm or less, wherein at least a part of a surface of the inorganic filler includes an aminosilyl group having an amino group, and a light transmittance at a wavelength of 500 nm of a sheet is 70% or more, as measured under an atmosphere at 90 , when the sheet is fabricated by cutting the resin composition molded article into 0.5 mm thickness.