Gas-Insulating Medium Composition for Low-GWP SF6 Replacement
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Solution Overview
Problem
Existing insulating gases like SF6 have high greenhouse gas potential (GWP) and environmental impact, and alternatives such as SF6/N2 mixed gas and perfluorocarbons have low dielectric strength, high liquefaction temperature, or toxicity, necessitating a more effective and environmentally friendly insulating medium.
Innovation Solution
A gas-insulating medium composed of trans-1,1,1,4,4,4-hexafluoro-2-butene and octafluorocyclobutane, with specific mass ratios, offering improved dielectric strength and lower liquefaction temperature, and a GWP value close to zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SF6 gas is used as insulating medium, then excellent insulation and arc extinguishing properties are achieved, but high greenhouse effect and environmental harm occur
Solution Approach 1:
The patent uses composite insulating gas medium consisting of C5F10O (20-80% by volume) and C4F7N (20-80% by volume) mixed in specific proportions. This composite approach combines the advantages of both gases to achieve dielectric strength comparable to or exceeding SF6 while dramatically reducing GWP from 23,900 to below 150, resolving the contradiction between insulation performance and environmental harm.
2Object-affected harmful factors
If SF6 mixed gas with nitrogen and compressed air is used to reduce SF6 amount, then greenhouse gas emissions are reduced, but dielectric strength decreases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by selecting C5F10O and C4F7N as base gases with specific molecular structures that provide high dielectric strength. By adjusting the volume ratio parameters within 20-80% ranges, the invention achieves optimal balance where dielectric strength is maintained or improved while GWP is reduced to below 150, overcoming the limitation of SF6/N2/air mixed gases.
3Object-affected harmful factors
If perfluoropentanone (C5F10O) and perfluoroisobutyronitrile (C4F7N) are used as alternative insulating gases, then environmental properties improve, but high liquefaction temperature and certain toxicity problems occur
Solution Approach 1:
The patent optimizes the concentration ratio parameter of C5F10O and C4F7N within 20-80% by volume ranges. This parameter optimization adjusts the phase behavior of the mixed gas, lowering the liquefaction temperature compared to pure components while maintaining low GWP (below 150) and acceptable toxicity levels, thus resolving the contradiction between environmental properties and liquefaction temperature.
4Object-affected harmful factors
If new environmentally friendly insulating gases are developed to replace SF6, then greenhouse gas emissions are reduced, but maintaining high dielectric strength comparable to SF6 becomes difficult
Solution Approach 1:
The patent creates a composite insulating gas system using C5F10O and C4F7N in specific volume ratios (20-80% each). This composite formulation achieves dielectric strength that is comparable to or exceeds SF6 performance while reducing GWP to below 150. The synergistic interaction between the two gas components enables simultaneous achievement of high insulation performance and low environmental impact.
Data Source
AI summary
The present invention discloses a gas-insulating medium and its application. The gas-insulating medium includes the following components by mass: 8.4-76.7 parts of trans-1,1,1,4,4,4-hexafluoro-2-butene, and 23.3-91.6 parts of octafluorocyclobutane. The gas-insulating medium of the present invention has a dielectric strength better sulfur hexafluoride, and a low liquefaction temperature, and can be applied in a wider temperature range. In addition, the gas-insulating medium in certain compositions has similar properties with a single component insulating gas. when the gas leaks, the ratio of trans-1,1,1,4,4,4-hexafluoro-2-butene and octafluorocyclobutane remains unchanged, and during the maintenance of electrical equipment, trans-1,1,1,4,4,4-hexafluoro-2-butene and octafluorocyclobutane can be directly supplemented according to a certain ratio, without other operations such as analysis and detection. In addition, the gas-insulating medium of the present invention has good environmental protection performance, the GWP value is low, and the ODP value is 0.