Hydrofluoroolefin Gas Mixture for Medium-Voltage Arc Extinguishing
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Solution Overview
Problem
Current medium and high voltage electrical devices rely on sulfur hexafluoride (SF6) for insulation and arc extinguishing, which has a high global warming potential and long atmospheric residence time, prompting the need for alternatives that maintain dielectric strength while reducing environmental impact.
Innovation Solution
A mixture comprising hydrofluoroolefins, such as C3H2F4, with a global warming potential less than 20, used as a gaseous medium for electrical insulation and arc extinguishing in medium voltage devices, often combined with dilution gases like nitrogen or air to maintain dielectric properties similar to SF6.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfur hexafluoride (SF6) is used for electrical insulation and arc extinguishing, then dielectric strength and thermal conductivity are improved, but global warming potential increases significantly
Solution Approach 1:
The invention changes the chemical composition parameters by replacing SF6 with hydrofluoroolefin-based mixtures having different molecular structures and lower GWP values, while adjusting mixture ratios to achieve comparable dielectric strength
Solution Approach 2:
The invention uses composite gas mixtures combining hydrofluoroolefins with other gases (such as nitrogen, carbon dioxide, or fluorinated compounds) to achieve a balance between dielectric performance and environmental compatibility, where the composite mixture provides both required electrical insulation and reduced global warming potential
2Object-affected harmful factors
If simple gases such as air or nitrogen are used for insulation, then global warming potential is reduced, but dielectric strength decreases significantly
Solution Approach 1:
The invention creates composite gas mixtures that combine simple low-GWP gases (air, nitrogen) with hydrofluoroolefins or other fluorinated compounds to achieve enhanced dielectric strength while maintaining low global warming potential, effectively merging the advantages of both simple and fluorinated gases
3Strength
If perfluorocarbons are used for insulation, then dielectric strength is improved, but global warming potential remains high (5000-10000)
Solution Approach 1:
The invention changes the chemical parameters by replacing perfluorocarbons with hydrofluoroolefins that have lower GWP values, while adjusting the molecular structure and mixture composition to maintain or improve dielectric strength performance
4Object-affected harmful factors
If mixtures of SF6 and nitrogen are used, then global warming potential is reduced, but dielectric strength decreases to 59% of SF6
Solution Approach 1:
The invention changes the mixture composition parameters by replacing SF6 with hydrofluoroolefins in the mixture, thereby reducing GWP while maintaining or improving dielectric strength compared to SF6-nitrogen mixtures
Solution Approach 2:
The invention uses optimized composite mixtures of hydrofluoroolefins with nitrogen or other gases, where the specific composition ratios are tuned to achieve both low global warming potential and high dielectric strength, outperforming conventional SF6-nitrogen mixtures
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 hydrofluoroolefin mixture provides effective electrical insulation and arc extinguishing with a significantly reduced environmental impact, meeting or exceeding the dielectric strength of SF6 while minimizing global warming potential, allowing for compact device designs that comply with environmental regulations.
Implementation Method 1
electrical insulation and, where appropriate, extinguishing of electric arcs are typically provided by a gas which is confined within an enclosure of these devices
Implementation Method 2
this gas has relatively high dielectric strength, good thermal conductivity and low dielectric losses
Implementation Method 3
extinguishing of electric arcs are typically provided by a gas which is confined within an enclosure of these devices
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to the use of a mixture comprising a hydrofluoroolefin, optionally associated with a dilution gas, as an electric-arc-extinguishing and/or electric insulating gaseous medium in a medium-voltage electrical device. The invention also relates to a medium-voltage electrical device in which electric-arc extinguishing and/or electric insulation is/are provided by a gaseous medium comprising a hydrofluoroolefin, optionally associated with a dilution gas.