Low-Moisture Halogenated Olefin Dielectric for Arc Extinction
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Solution Overview
Problem
Existing dielectric gases for medium-voltage and high-voltage electric devices, such as sulfur hexafluoride, have high global warming potential and environmental impact, while alternatives like halogenated olefins are prone to water-induced decomposition and corrosion, affecting insulation and arc extinguishing performance.
Innovation Solution
A dielectric composition comprising halogenated olefins with 2 to 4 carbon atoms and controlled water content, along with specific minor components, is used to enhance stability and reduce decomposition, ensuring effective insulation and arc extinguishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfur hexafluoride is used as dielectric gas, then dielectric strength and electrical insulation performance are improved, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using halogenated olefins (specifically fluorinated and chlorinated olefins with 2-4 carbon atoms) instead of sulfur hexafluoride. These alternative gases have significantly lower GWP values while maintaining comparable dielectric strength, thus resolving the contradiction between electrical performance and environmental impact.
Solution Approach 2:
The patent employs composite gas mixtures containing halogenated olefins combined with other gases (such as nitrogen, carbon dioxide, or fluorinated hydrocarbons) in specific ratios. This composite approach allows optimization of both dielectric strength and environmental characteristics, achieving a balance between electrical insulation performance and reduced global warming potential.
2Object-generated harmful factors
If halogenated olefins are used as alternative dielectric gas, then global warming potential is reduced, but water-induced decomposition and corrosion increase
Solution Approach 1:
The patent optimizes the water content parameter in the dielectric gas to extremely low levels (50 ppm or less, preferably 10 ppm or less). This parameter control prevents water-induced decomposition of halogenated olefins and subsequent corrosion of electrical components, thereby maintaining reliability while using environmentally friendly alternative gases.
Solution Approach 2:
The patent introduces drying agents or water scavenging materials as intermediaries within the electrical equipment to actively remove trace water from the dielectric gas environment. This intermediary mechanism protects the halogenated olefins from water-induced decomposition and prevents corrosion, enhancing system reliability.
3Object-generated harmful factors
If naturally occurring gases like air or nitrogen are used as alternatives, then environmental impact is reduced, but dielectric strength decreases significantly
Solution Approach 1:
The patent creates composite dielectric gas mixtures that combine halogenated olefins with naturally occurring gases like nitrogen or carbon dioxide. These composite mixtures maintain lower environmental impact compared to pure SF6 while achieving sufficient dielectric strength through the synergistic effect of the components, thus resolving the contradiction between environmental friendliness and electrical performance.
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 dielectric composition maintains high stability, reduces water-induced decomposition, and provides efficient insulation and arc extinguishing performance, suitable for medium-voltage and high-voltage electric devices.
Implementation Method 1
a gas filled in a closed vessel of any of these electric devices usually serves to provide electrical insulation
Implementation Method 2
achieve electric arc extinction, if necessary
Data Source
AI summary
A dielectric, including a halogenated olefin having from 2 to 4 carbon atoms, and having a water content of 6000 ppm or less in terms of mass.