Gas-Insulated Switchgear Dielectric Composition Against HFO Isomerization
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Solution Overview
Problem
The isomerization of hydrofluoroolefins (HFO) and hydrochlorofluoroolefins (HCFO) used as dielectrics in electric facilities leads to changes in boiling points, affecting insulation performance and safety due to potential liquefaction or pressure increases.
Innovation Solution
Using a dielectric mixture of 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) and 1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz) with specific isomer ratios and conductor surfaces made of metals or metal oxides to suppress isomerization, along with adsorbents and desiccants to maintain dielectric purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO or HCFO is used as a dielectric to substitute for SF6, then the environmental load is reduced, but the dielectric may undergo isomerization reaction leading to changes in boiling point and deterioration of insulation performance
Solution Approach 1:
The patent changes the chemical composition parameters by using specific HFO/HCFO isomers (1-chloro-2,3,3,3-tetrafluoropropene and 1,1,1,4,4,4-hexafluoro-2-butene) with controlled Z/E isomer ratios, thereby achieving lower reactivity and suppressed isomerization while maintaining environmental benefits
Solution Approach 2:
The patent introduces metal or metal oxide coatings on conductor surfaces as intermediaries that suppress the isomerization reaction of the dielectric, preventing direct contact between the reactive dielectric and the conductor surface that would catalyze isomerization
2Stability of the object's composition
If the dielectric undergoes isomerization, then the boiling point changes, but this leads to liquefaction or pressure increase affecting safety and insulation performance
Solution Approach 1:
The patent selects specific HFO/HCFO isomers with stable boiling points (HCFO-1224yd: 15°C, HFO-1336mzz: 33°C) and controls their isomer ratios to minimize boiling point variations during operation, preventing liquefaction and pressure issues
Solution Approach 2:
Metal or metal oxide coatings on conductor surfaces act as intermediaries that suppress isomerization reactions, thereby stabilizing the dielectric composition and boiling point over time
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 effectively suppresses isomerization, maintaining insulation performance and safety by minimizing changes in dielectric boiling points and pressure, ensuring stable operation of electric facilities.
Implementation Method 1
a metal tank in which a conductor member is disposed, the metal tank being filled with a dielectric
Implementation Method 2
a surface of the conductor member includes one or more selected from the group consisting of a metal and a metal oxide
Data Source
AI summary
An electric facility includes: a metal tank in which a conductor member is disposed, the metal tank being filled with a dielectric, in which the dielectric contains at least one selected from the group consisting of 1-chloro-2,3,3,3-tetrafluoropropene and 1,1,1,4,4,4-hexafluoro-2-butene; and a surface of the conductor member includes one or more selected from the group consisting of a metal and a metal oxide.