Graphene Oxide Polymer Field Grading Material for Cable Joints
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Solution Overview
Problem
Existing field grading materials for electrical cables suffer from poor mechanical properties, high weight, and a tendency to overheat due to the high loading of semiconducting particles required for non-linear conductivity, which compromises their performance in distributing electrical potential uniformly.
Innovation Solution
A composite material comprising reduced graphene oxide distributed within a polymer material, which is thermally reduced and mixed with a resin, providing non-linear resistivity and improved mechanical properties, reducing electric field stress at cable joints and terminations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high loading of semiconducting particles (30-40% by volume) is used to achieve non-linear conductivity, then non-linear conductivity is improved, but mechanical properties deteriorate (brittleness)
Solution Approach 1:
The patent changes the particle loading parameter from traditional 30-40% to a lower range (5-20%), and simultaneously changes the particle type from semiconducting ceramics to graphene-based materials, achieving non-linear conductivity at lower concentrations while maintaining mechanical integrity
Solution Approach 2:
The patent uses composite materials comprising graphene oxide, reduced graphene oxide, or graphene nanoparticles dispersed in a polymer matrix, combining the electrical properties of graphene with the mechanical properties of the polymer to achieve both non-linear conductivity and good mechanical properties
2Reliability
If high loading of semiconducting particles (30-40% by volume) is used to achieve non-linear conductivity, then non-linear conductivity is improved, but weight increases
Solution Approach 1:
The patent changes the particle loading parameter from 30-40% to 5-20%, significantly reducing the amount of filler material required to achieve the desired electrical properties, thereby reducing the overall weight of the field grading material
Solution Approach 2:
The patent employs graphene-based materials which provide superior electrical properties at lower loadings compared to traditional semiconducting ceramics, effectively replacing heavier materials with lighter, more efficient alternatives
3Reliability
If high loading of semiconducting particles (30-40% by volume) is used to achieve non-linear conductivity, then non-linear conductivity is improved, but temperature control deteriorates (tendency to overheat)
Solution Approach 1:
The patent changes the particle loading to an optimized range (5-20%) and uses graphene-based materials with superior thermal conductivity, enabling efficient heat dissipation while maintaining non-linear conductivity, thus preventing overheating
Solution Approach 2:
The patent replaces semiconducting ceramic particles with graphene-based materials, utilizing graphene's exceptional thermal conductivity properties to substitute the thermal management function, thereby preventing heat accumulation and overheating
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 composite material effectively reduces electric field stress, prevents heat generation, and enhances mechanical properties, allowing for better distribution of electrical potential while maintaining high conductivity and dielectric constants, thus addressing the limitations of traditional field grading materials.
Implementation Method 1
thermally reducing a quantity of graphene oxide by increasing an ambient temperature of an atmosphere containing the quantity of graphene oxide to between about 70° C. and about 160° C.
Implementation Method 2
a field grading material comprising reduced graphene oxide distributed within a polymer material... a positive voltage applied to the cable induces a resistive voltage drop in the field grading material, which distributes the potential more uniformly
Data Source
AI summary
The invention relates generally to field grading materials and, more particularly, to field grading materials including graphene oxide, reduced graphene oxide, or both, exhibiting non-linear resistivity. In one embodiment, the invention provides a composite material comprising: a polymer material; and reduced graphene oxide distributed within the polymer material.