Dielectric composition, electrical device, supply method, and use of dielectric composition

Abstract

Provided is a dielectric composition containing carbon dioxide and a halogenated olefin having 2 carbon atoms, the carbon dioxide content with respect to the total amount of the halogenated olefin having 2 carbon atoms and the carbon dioxide being 76.4 mass% or more, or a dielectric composition containing nitrogen and the halogenated olefin having 2 carbon atoms, the nitrogen content with respect to the total amount of the halogenated olefin having 2 carbon atoms and the nitrogen being 77.6 mass% or more, wherein the amount of oxygen with respect to the total amount of the dielectric composition is less than 1.0 vol%. Also provided are an electrical device and a supply method in which the dielectric composition is used, and a use of the dielectric composition.

Description

Dielectric compositions, electrical devices, methods of providing, and uses of dielectric compositions

[0001] The present disclosure relates to dielectric compositions, electrical devices, methods of providing, and uses of the dielectric compositions.

[0002] In medium or high voltage electrical equipment, electrical insulation and, if necessary, electrical arc quenching are usually achieved by gases enclosed within the electrical equipment enclosure. The gas most frequently used today is sulfur hexafluoride (SF ６ ) . Sulfur hexafluoride has a relatively high dielectric strength, good thermal conductivity, and low dielectric loss. It is chemically inert, non-toxic to humans and animals, and recombines almost completely immediately after being separated by an electric arc. Furthermore, sulfur hexafluoride is non-flammable and inexpensive. However, sulfur hexafluoride has a global warming potential (GWP) of 100 times lower than CO ２ It has a carbon monoxide content of about 23,500 and remains in the atmosphere for about 3,200 years, making it known as one of the gases with a high greenhouse effect.

[0003] As an alternative to sulfur hexafluoride, it is known to use naturally occurring gases such as air and nitrogen, which have a lower environmental impact than sulfur hexafluoride. However, because the dielectric strength of naturally occurring gases is lower than that of sulfur hexafluoride, using naturally occurring gases for electrical insulation or arc quenching in medium or high voltage electrical equipment requires a significant increase in the volume of the electrical equipment or the gas filling pressure. Therefore, the use of naturally occurring gases as an alternative to sulfur hexafluoride contradicts the efforts made over the past several decades to develop miniaturized electrical equipment with increasingly smaller external dimensions.

[0004] As another example of a substitute for sulfur hexafluoride, fluorinated olefins are known (see, for example, Patent Document 1). Fluorinated olefins have a low GWP and low toxicity to humans and animals, and are therefore considered to be one of the promising compounds as a substitute for sulfur hexafluoride.

[0005] International Publication No. 2021 / 206174

[0006] However, among fluorinated olefins, (E)-1,3,3,3-tetrafluoropropene and the like have a relatively high boiling point and tend to liquefy in low ambient air environments, making them difficult to handle. Furthermore, some fluorinated olefins are highly flammable. When highly flammable gases are used, fire extinguishing equipment, fire walls, and other disaster prevention facilities are required as a countermeasure against fires in the event of equipment accidents. Therefore, it is desirable for dielectric compositions to be non-flammable. However, until now, there has been no knowledge regarding the suppression of flammability in dielectric compositions containing fluorinated olefins.

[0007] In view of the above circumstances, the present disclosure provides a dielectric composition that has a low GWP and a low boiling point, making it easy to handle and suppressing flammability, an electrical device using the same, a supply method, and uses of the dielectric composition.

[0008] Means for solving the above problems include the following aspects. <1> A dielectric composition comprising a halogenated olefin having two carbon atoms and carbon dioxide, wherein the content of the carbon dioxide relative to the total amount of the halogenated olefin having two carbon atoms and the carbon dioxide is 76.4% by mass or more, or a halogenated olefin having two carbon atoms and nitrogen, wherein the content of the nitrogen relative to the total amount of the halogenated olefin having two carbon atoms and the nitrogen is 77.6% by mass or more, and wherein the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0% by volume. <2> A dielectric composition according to <1>, comprising a halogenated olefin having two carbon atoms and carbon dioxide, wherein the content of the carbon dioxide relative to the total amount of the halogenated olefin having two carbon atoms and the carbon dioxide is 79.5% by mass or more, or a halogenated olefin having two carbon atoms and nitrogen, wherein the content of the nitrogen relative to the total amount of the halogenated olefin having two carbon atoms and the nitrogen is 81.5% by mass or more, and wherein the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0% by volume. <3> The dielectric composition according to <1> or <2>, wherein the halogenated olefin having two carbon atoms comprises at least one selected from the group consisting of 1,1-difluoroethylene, (E)-1,2-difluoroethylene, (Z)-1,2-difluoroethylene, and trifluoroethylene. <4> The dielectric composition according to any one of <1> to <3>, wherein the halogenated olefin having two carbon atoms is 1,1-difluoroethylene. <5> The dielectric composition according to any one of <1> to <4>, wherein the total content of the halogenated olefin having two carbon atoms and carbon dioxide relative to the total amount of the dielectric composition is 99.0 vol% or more, or the total content of the halogenated olefin having two carbon atoms and nitrogen relative to the total amount of the dielectric composition is 99.0 vol% or more. <6> The dielectric composition according to any one of <1> to <5>, wherein the dielectric composition is in a single phase. <7> The dielectric composition according to any one of <1> to <6>, wherein the dielectric composition is used as at least one selected from the group consisting of an electrical insulating medium and an electric arc extinguishing medium. <8> An electric device comprising: an electric component; the dielectric composition according to any one of <1> to <7>; and a sealed container containing the dielectric composition.<9> The electric device according to <8>, which is a gas-insulated circuit breaker, current interruption equipment, gas-insulated power line, gas-insulated transformer, gas-insulated substation, gas-insulated switchgear, gas-insulated disconnector, gas-insulated load breaker, or particle accelerator. <10> A method for supplying the dielectric composition according to any one of <1> to <7> to an electric device. <11> Use of the dielectric composition according to any one of <1> to <7>, which is used at a temperature of -75°C to 60°C. <12> Use of the dielectric composition according to any one of <1> to <7> as an electrical insulating medium or an electric arc extinguishing medium.

[0009] According to the present disclosure, there are provided dielectric compositions having a low GWP and a low boiling point, which make them easy to handle and reduce flammability, electrical devices and supply methods using the same, and uses of the dielectric compositions.

[0010] 1 is a cross-sectional view showing an example of the configuration of an electric device according to one embodiment. ２ CO relative to the total amount ２ The horizontal axis represents the content of HFO-1132a and CO ２ , and HFO-1132a and CO relative to the total amount of air ２ In the examples, the total content of HFO-1132a and CO was plotted on the vertical axis. ２ CO relative to the total amount ２ The horizontal axis represents the content of HFO-1132a and CO ２ , and HFO-1132a and CO relative to the total amount of air ２ In the examples, the total content of HFO-1132a and N was plotted on the vertical axis. ２ N relative to the total amount of ２ The horizontal axis represents the content of HFO-1132a, N ２ , and HFO-1132a and N relative to the total amount of air ２ In the examples, the total content of HFO-1132a and N was plotted on the vertical axis. ２ N relative to the total amount of２ The horizontal axis represents the content of HFO-1132a, N ２ , and HFO-1132a and N relative to the total amount of air ２ 1 is a graph plotting the total content of

[0011] Hereinafter, modes for carrying out embodiments of the present disclosure will be described in detail. However, the embodiments of the present disclosure are not limited to the following embodiments. In the following embodiments, components (including element steps, etc.) are not essential unless otherwise specified. The same applies to numerical values ​​and their ranges, and they do not limit the embodiments of the present disclosure.

[0012] In the present disclosure, the term "process" includes not only processes that are independent of other processes, but also processes that cannot be clearly distinguished from other processes as long as the purpose of the process is achieved. In the present disclosure, numerical ranges indicated using "to" include the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In numerical ranges described in stages in the present disclosure, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another staged numerical range. Furthermore, in numerical ranges described in the present disclosure, the upper or lower limit value of that numerical range may be replaced with a value shown in the examples. In the present disclosure, each component may contain multiple corresponding substances. When multiple substances corresponding to each component are present in a composition, the content or amount of each component means the total content or amount of the multiple substances present in the composition, unless otherwise specified. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, even when an element is described in the singular, this does not exclude the presence of multiple substances unless technical contradiction arises, unless otherwise specified. In this disclosure, "medium voltage" means a voltage that is 1000 volts or more for AC and 1500 volts or more for DC, but less than 52,000 volts for AC and less than 75,000 volts for DC. In this disclosure, "high voltage" means a voltage that is 52,000 volts or more for AC and 75,000 volts or more for DC. In this disclosure, the proportion of each component in the dielectric composition represents the proportion of each component when the dielectric composition is in a gaseous state. When embodiments are described in this disclosure with reference to drawings, the configuration of the embodiment is not limited to the configuration shown in the drawings. Furthermore, the sizes of components in each drawing are conceptual, and the relative size relationships between components are not limited thereto.

[0013] <Dielectric Composition> The dielectric composition of the present disclosure includes a halogenated olefin having two carbon atoms and carbon dioxide, wherein the carbon dioxide content relative to the total amount of the halogenated olefin having two carbon atoms and the carbon dioxide is 76.4% by mass or more, or a halogenated olefin having two carbon atoms and nitrogen, wherein the nitrogen content relative to the total amount of the halogenated olefin having two carbon atoms and the nitrogen is 77.6% by mass or more, and the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0% by volume. Hereinafter, the halogenated olefin having two carbon atoms is also referred to as a "specific olefin." The dielectric composition of the present disclosure has a low GWP and a low boiling point, making it easy to handle and suppressing flammability. For example, the dielectric composition of the present disclosure is resistant to combustion at 20°C even when leaked into air, regardless of the amount of air.

[0014] In one embodiment, the dielectric composition comprises a specific olefin and carbon dioxide, and the content of the carbon dioxide relative to the total amount of the specific olefin and the carbon dioxide is 79.5% by mass or more, or a specific olefin and nitrogen, and the content of the nitrogen relative to the total amount of the specific olefin and the nitrogen is 81.5% by mass or more, and the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0% by volume. The dielectric composition of this embodiment is unlikely to burn even when leaked into air at a higher temperature environment, for example at 60°C, regardless of the amount of air.

[0015] Patent Document 1 specifically describes dielectrics containing halogenated propenes such as 1-chloro-2,3,3,3-tetrafluoropropene, 2,3,3,3-tetrafluoro-1-propene, and (E)-1,3,3,3-tetrafluoropropene. For example, (E)-1,3,3,3-tetrafluoropropene has a relatively high boiling point of approximately -19°C. Therefore, there are issues with its handling, such as its tendency to liquefy at low operating temperatures. On the other hand, specific olefins have a relatively low boiling point, which offers the advantage of ease of handling in low ambient air environments. Meanwhile, while some specific olefins are flammable, the dielectric composition of the present disclosure can suppress flammability by using carbon dioxide or nitrogen in combination.

[0016] In addition, since carbon dioxide and nitrogen have boiling points equal to or lower than those of the specific olefin, they are less likely to liquefy even at low temperatures. Therefore, when the dielectric composition of the present disclosure is supplied to an electrical device and operated at a predetermined temperature, the pressure inside the device tends to be easily maintained.

[0017] Hereinafter, an embodiment of a dielectric composition containing a specific olefin and carbon dioxide, in which the carbon dioxide content relative to the total amount of the specific olefin and carbon dioxide is 76.4 mass% or more, and the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0 volume% will be referred to as the "first embodiment." Also, an embodiment of a dielectric composition containing a specific olefin and nitrogen, in which the nitrogen content relative to the total amount of the specific olefin and nitrogen is 77.6 mass% or more, and the amount of oxygen relative to the total amount of the dielectric composition is less than 1.0 volume% will be referred to as the "second embodiment." The dielectric compositions of the first and second embodiments are collectively referred to as the "dielectric composition of the present disclosure" or simply as the "dielectric composition." Below, each component contained in the dielectric composition of the present disclosure will be described in detail.

[0018] (Specific olefin) The specific olefin is not particularly limited as long as it is an olefin having two carbon atoms and containing at least one halogen atom. From the viewpoint of low environmental load and excellent insulating properties and arc-extinguishing properties, the specific olefin preferably contains a fluorine atom and / or a chlorine atom, and more preferably contains a fluorine atom. The number of halogen atoms in the specific olefin is preferably 2 to 4, more preferably 2 or 3. In addition, generally, the fewer the number of hydrogen atoms in the olefin, the lower the flammability tends to be. From this viewpoint, the number of hydrogen atoms in the specific olefin is preferably 2 or less, and may be 1 or less. One specific olefin may be used alone, or two or more specific olefins may be used in combination.

[0019] The GWP of the specific olefin is preferably 500 or less, more preferably 200 or less, even more preferably 150 or less, particularly preferably 100 or less, even more preferably 50 or less, even more preferably 20 or less, even more preferably 15 or less, even more preferably 10 or less, even more preferably 7 or less, even more preferably 5 or less, even more preferably 4 or less, and even more preferably 3 or less. Unless otherwise specified, the GWP is the 100-year value from the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

[0020] From the viewpoint of ease of handling in a low ambient temperature environment, the boiling point of the specific olefin is preferably −20° C. or lower, more preferably −40° C. or lower, even more preferably −60° C. or lower, and particularly preferably −80° C. or lower. The boiling point of the specific olefin may be −100° C. or higher. From this viewpoint, the boiling point of the specific olefin is preferably −100 to −20° C., more preferably −100 to −40° C., even more preferably −100 to −60° C., and particularly preferably −100 to −80° C.

[0021] Examples of the specific olefin include 1,1-difluoroethylene, (E)-1,2-difluoroethylene, (Z)-1,2-difluoroethylene, vinyl fluoride, tetrafluoroethylene, trifluoroethylene, etc. Among these, 1,1-difluoroethylene, (E)-1,2-difluoroethylene, (Z)-1,2-difluoroethylene, and trifluoroethylene are preferred, and from the viewpoint of ease of handling due to their low boiling points, 1,1-difluoroethylene, (E)-1,2-difluoroethylene, and trifluoroethylene are more preferred, and 1,1-difluoroethylene is even more preferred.

[0022] The boiling points and GWPs of specific olefins used in the dielectric compositions of the present disclosure, as well as other compounds used as dielectrics, are listed in the table below. In the table, "N.D." indicates that the boiling point is not listed in the IPCC Sixth Assessment Report (AR6), and is presumed to be 10 or less due to the structure of the compound.

[0023]

[0024] In the first embodiment, the content of the specific olefin relative to the total amount of the dielectric composition is preferably 15.05% by volume or less, more preferably 14.5% by volume or less, and even more preferably 14.0% by volume or less, from the viewpoint of suppressing flammability. From the viewpoints of insulating performance and arc-extinguishing performance, the content is preferably 3.0% by volume or more, more preferably 4.0% by volume or more, and even more preferably 5.0% by volume or more. From these viewpoints, the content is preferably 3.0 to 15.05% by volume, more preferably 4.0 to 14.5% by volume, and even more preferably 5.0 to 14.0% by volume. Of these, it is preferable that the specific olefin is 1,1-difluoroethylene, and the content of 1,1-difluoroethylene is in the above-mentioned range.

[0025] In the second embodiment, the content of the specific olefin relative to the total amount of the dielectric composition is preferably 9.0% by volume or less, more preferably 8.5% by volume or less, and even more preferably 8.0% by volume or less, from the viewpoint of suppressing flammability. From the viewpoints of insulating performance and arc-extinguishing performance, the content is preferably 3.0% by volume or more, more preferably 3.5% by volume or more, and even more preferably 4.0% by volume or more. From these viewpoints, the content is preferably 3.0 to 9.0% by volume, more preferably 3.5 to 8.5% by volume, and even more preferably 4.0 to 8.0% by volume. Among these, it is preferable that the specific olefin is 1,1-difluoroethylene, and the content of 1,1-difluoroethylene is in the above range.

[0026] (Carbon dioxide) In the first embodiment, the dielectric composition contains carbon dioxide. The carbon dioxide content relative to the total amount of the specific olefin and carbon dioxide is 76.4% by mass or more. From the viewpoint of reducing flammability, it is preferably 79.5% by mass or more, more preferably 80.0% by mass or more, and even more preferably 80.5% by mass or more. From the viewpoint of better exhibiting the function of the specific olefin, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From such viewpoints, the content is preferably 76.4 to 97.0% by mass, more preferably 79.5 to 97.0% by mass, even more preferably 80.0 to 96.0% by mass, and particularly preferably 80.5 to 95.0% by mass.

[0027] In the first embodiment, when the specific olefin is 1,1-difluoroethylene, the content of carbon dioxide relative to the total amount of 1,1-difluoroethylene and carbon dioxide is 76.4% by mass or more. From the viewpoint of reducing flammability, it is preferably 79.5% by mass or more, more preferably 80.0% by mass or more, and even more preferably 80.5% by mass or more. From the viewpoint of better exhibiting the functions of 1,1-difluoroethylene, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From such viewpoints, the content is preferably 76.4 to 97.0% by mass, more preferably 79.5 to 97.0% by mass, even more preferably 80.0 to 96.0% by mass, and particularly preferably 80.5 to 95.0% by mass.

[0028] In the first embodiment, the carbon dioxide content of the entire dielectric composition is preferably 76.4% by mass or more, more preferably 79.5% by mass or more, even more preferably 80.0% by mass or more, and particularly preferably 80.5% by mass or more, from the viewpoint of reducing flammability. From the viewpoint of better exhibiting the function of the specific olefin, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From this viewpoint, the content is preferably 76.4 to 97.0% by mass, more preferably 79.5 to 97.0% by mass, even more preferably 80.0 to 96.0% by mass, and even more preferably 80.5 to 95.0% by mass.

[0029] (Nitrogen) In a second embodiment, the dielectric composition contains nitrogen. The nitrogen content relative to the total amount of the specific olefin and nitrogen is 77.6% by mass or more. From the viewpoint of further reducing flammability, it is preferably 81.5% by mass or more, more preferably 82.0% by mass or more, and even more preferably 82.5% by mass or more. From the viewpoint of better exhibiting the function of the specific olefin, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From such a viewpoint, the content is preferably 77.6 to 97.0% by mass, more preferably 81.5 to 97.0% by mass, even more preferably 82.0 to 96.0% by mass, and particularly preferably 82.5 to 95.0% by mass.

[0030] In the second embodiment, when the specific olefin is 1,1-difluoroethylene, the nitrogen content relative to the total amount of 1,1-difluoroethylene and nitrogen is 77.6% by mass or more. From the viewpoint of further reducing flammability, it is preferably 81.5% by mass or more, more preferably 82.0% by mass or more, and even more preferably 82.5% by mass or more. From the viewpoint of better exhibiting the functions of 1,1-difluoroethylene, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From such viewpoints, the content is preferably 77.6 to 97.0% by mass, more preferably 81.5 to 97.0% by mass, even more preferably 82.0 to 96.0% by mass, and particularly preferably 82.5 to 95.0% by mass.

[0031] In the second embodiment, the nitrogen content of the entire dielectric composition is preferably 77.6% by mass or more, more preferably 81.5% by mass or more, even more preferably 82.0% by mass or more, and particularly preferably 82.5% by mass or more, from the viewpoint of reducing flammability. From the viewpoint of better exhibiting the function of the specific olefin, the content is preferably 97.0% by mass or less, more preferably 96.0% by mass or less, and even more preferably 95.0% by mass or less. From this viewpoint, the content is preferably 77.6 to 97.0% by mass, more preferably 81.5 to 97.0% by mass, even more preferably 82.0 to 96.0% by mass, and particularly preferably 82.5 to 95.0% by mass.

[0032] (Oxygen) The amount of oxygen in the dielectric composition is less than 1.0 vol%. In other words, the dielectric composition does not contain oxygen or contains oxygen in an amount greater than 0 vol% and less than 1.0 vol%. The amount of oxygen in the dielectric composition is preferably 0.5 vol% or less, more preferably 0.1 vol% or less, and even more preferably 0.06 vol% or less.

[0033] (Other Components) In the first embodiment, the dielectric composition may or may not contain components other than the specific olefin and carbon dioxide. In the second embodiment, the dielectric composition may or may not contain components other than the specific olefin and nitrogen.

[0034] In the first embodiment, the dielectric composition may or may not further contain nitrogen. When the dielectric composition in the first embodiment further contains nitrogen, the nitrogen content relative to the total amount of the dielectric composition is preferably 2.0 vol% or less, more preferably 1.0 vol% or less, and even more preferably 0.5 vol% or less. In the second embodiment, the dielectric composition may or may not further contain carbon dioxide. When the dielectric composition in the second embodiment further contains carbon dioxide, the carbon dioxide content relative to the total amount of the dielectric composition is preferably 2.0 vol% or less, more preferably 1.0 vol% or less, and even more preferably 0.5 vol% or less.

[0035] The dielectric composition may or may not contain components other than the specific olefin, carbon dioxide, and nitrogen. Examples of components other than the specific olefin, carbon dioxide, and nitrogen include at least one component selected from the group consisting of halogenated olefins other than the specific olefin (e.g., fluoroolefins other than the specific olefin, chloroolefins other than the specific olefin, chlorofluoroolefins other than the specific olefin), fluorocarbons, chlorofluorocarbons, chlorofluoroalkynes, methanol, ethanol, acetone, hexane, ethylene, methane, chloromethane, dichloroethane, acetylene, 2-methyl-2-propanol, β-pinene, pentafluoroiodoethane, and carbon monoxide (hereinafter also referred to as the "first specific trace component"). These components are thought to have the function of suppressing and stabilizing the decomposition of the specific olefin, although the reason for this is unclear. The first specific trace component is preferably non-flammable. Specifically, the first specific trace component is preferably Class 1 according to ASHRAE Standard 34 Refrigerant Safety Classification.

[0036] In this disclosure, fluoroolefin refers to an unsaturated hydrocarbon compound having a carbon-carbon double bond that contains fluorine atoms as halogen atoms but no chlorine atoms in the molecule. Fluoroolefins may or may not contain hydrogen atoms in the molecule. In this disclosure, chloroolefins refer to unsaturated hydrocarbon compounds having a carbon-carbon double bond that contains chlorine atoms as halogen atoms but no fluorine atoms in the molecule. Chloroolefins may or may not contain hydrogen atoms in the molecule. In this disclosure, chlorofluoroolefins refer to unsaturated hydrocarbon compounds having a carbon-carbon double bond that contain fluorine atoms and chlorine atoms as halogen atoms in the molecule. Chlorofluoroolefins may or may not contain hydrogen atoms in the molecule. In this disclosure, fluorocarbons refer to saturated hydrocarbon compounds that contain fluorine atoms as halogen atoms but no chlorine atoms in the molecule. Fluorocarbons may or may not contain hydrogen atoms in the molecule. In this disclosure, chlorofluorocarbons refer to saturated hydrocarbon compounds that contain fluorine atoms and chlorine atoms as halogen atoms in the molecule. Chlorofluorocarbons may or may not contain hydrogen atoms in the molecule. In the present disclosure, a chlorofluoroalkyne refers to an acetylene-based hydrocarbon compound containing fluorine and chlorine atoms as halogen atoms in the molecule. The chlorofluoroalkyne may or may not contain a hydrogen atom in the molecule.

[0037] The first specific trace component may contain a fluoroolefin other than the specific olefin. Examples of the fluoroolefin other than the specific olefin include (E)-1,1,1,4,4,4-hexafluorobut-2-ene, (Z)-1,1,1,4,4,4-hexafluorobut-2-ene, 2,3,3,3-tetrafluoro-1-propene, (E)-1,3,3,3-tetrafluoropropene, (Z)-1,3,3,3-tetrafluoropropene, hexafluoropropene, and C ４ H ４ F ４ Examples of fluorinated hydrocarbons include those represented by the following formula: ４ H ４ F ４Examples of the fluorohydrocarbon represented by the formula (I) include 1,3,4,4-tetrafluoro-1-butene, 3,4,4,4-tetrafluoro-1-butene, 1,1,2,3-tetrafluoro-1-butene, and 2,4,4,4-tetrafluoro-1-butene.

[0038] The first specific trace component may contain a chloroolefin other than the specific olefin. Examples of the chloroolefin other than the specific olefin include chloroethylene, 1,1-dichloroethylene, 1,2-dichloroethylene, 1,1,2-trichloroethylene, and 1,1,2,2-tetrachloroethylene.

[0039] The first specific minor component may contain a chlorofluoroolefin other than the specific olefin. Examples of the chlorofluoroolefin other than the specific olefin include (E)-1-chloro-2,3,3,3-tetrafluoropropene, (Z)-1-chloro-2,3,3,3-tetrafluoropropene, (E)-1-chloro-3,3,3-trifluoropropene, (Z)-1-chloro-3,3,3-trifluoropropene, 1,1-dichloro-2,3,3,3-tetrafluoropropene, (Z)-2-chloro-1,3,3,3-tetrafluoropropene, (E)-2-chloro-1,3,3,3-tetrafluoropropene, 2-chloro-1,1,3,3,3-pentafluoro-1-propene, 2-chloro-3,3,3-trifluoropropene, 1,2-dichloro-1-fluoroethene, and 1,1,2-trichloro-2-fluoroethene.

[0040] The first specific trace component may contain a fluorocarbon. Examples of the fluorocarbon include monofluoromethane, difluoromethane, trifluoromethane, tetrafluoromethane, fluoroethane, 1,1-difluoroethane, 1,2-difluoroethane, 1,1,1-trifluoroethane, 1,1,2-trifluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, 1,1,1,2,2-pentafluoroethane, 1,1,1,2-tetrafluoropropane, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, C ４ H６ F ４ and octafluorocyclobutane. ４ H ６ F ４ Examples of the fluorohydrocarbon represented by the formula include 1,1,2,3-tetrafluorobutane.

[0041] The first specific trace component may include a chlorofluorocarbon, such as chlorodifluoromethane, chlorotrifluoromethane, 1-chloro-1,1-difluoroethane, 1-chloro-1,2-difluoroethane, 1-chloro-2,2-difluoroethane, 1,1-dichloro-1-fluoroethane, 1,1-dichloro-2-fluoroethane, 1,2-dichloro-2-fluoroethane, 2-chloro-1,1,1,2-tetrafluoropropane, 1,3-dichloro-1,1,2,2,3-pentafluoropropane, and 3,3-dichloro-1,1,1,2,2-pentafluoropropane.

[0042] The first specific trace component may include a chlorofluoroalkyne, such as 1-chloro-3,3,3-trifluoro-1-propyne.

[0043] When the dielectric composition contains a first specific trace component, the content of the first specific trace component relative to the total amount of the dielectric composition (when two or more types of first specific trace components are contained, the total content) is preferably 15,000 ppm by mass or less, and more preferably 10,000 ppm by mass or less, from the viewpoint of ensuring stability. The content may be 0 ppm by mass or more, 4 ppm by mass or more, 50 ppm by mass or more, or 100 ppm by mass or more. From this viewpoint, the content is preferably 0 to 15,000 ppm by mass, may be 50 to 10,000 ppm by mass, or may be 100 to 10,000 ppm by mass.

[0044] The dielectric composition may contain, but preferably does not contain, at least one trace component (hereinafter also referred to as "second specific trace component") selected from the group consisting of chlorine, hydrogen fluoride, hydrogen chloride, acetic acid, carbonyl fluoride, phosgene, trifluoroacetic acid fluoride, acetyl chloride, carbon monoxide, formyl chloride, and chloroform. From the viewpoint of reducing the possibility that the second specific trace component may react with the metal material or dissolve in water and come into contact with the metal material, thereby causing deterioration or embrittlement of the metal material, the content of the second specific trace component relative to the total amount of the dielectric composition (when two or more types of second specific trace components are included, the total content) is preferably 5000 mass ppm or less, more preferably 3000 mass ppm or less, even more preferably 1000 mass ppm or less, particularly preferably 500 mass ppm or less, extremely preferably 250 mass ppm or less, even more preferably 100 mass ppm or less, even more preferably 50 mass ppm or less, even more preferably 20 mass ppm or less, and even more preferably 0 mass ppm. The content may be 5 mass ppm or more, or may be 10 mass ppm or more. From this viewpoint, the content is preferably 0 to 5000 mass ppm, and may be 5 to 3000 mass ppm.

[0045] The dielectric composition may contain a first specific trace component and a second specific trace component. When the dielectric composition contains the first specific trace component and the second specific trace component, the preferred ranges of their contents are as described above.

[0046] In the first embodiment, the total content of the specific olefin and carbon dioxide relative to the total amount of the dielectric composition is preferably 99.0% by volume or more, more preferably 99.5% by volume or more, and may be 100% by volume. In the second embodiment, the total content of the specific olefin and nitrogen relative to the total amount of the dielectric composition is preferably 99.0% by volume or more, more preferably 99.5% by volume or more, and may be 100% by volume.

[0047] In the first embodiment, when the specific olefin is 1,1-difluoroethylene, the total content of 1,1-difluoroethylene and carbon dioxide relative to the total amount of the dielectric composition is preferably 99.0% by volume or more, more preferably 99.5% by volume or more, and may be 100% by volume. In the second embodiment, when the specific olefin is 1,1-difluoroethylene, the total content of 1,1-difluoroethylene and nitrogen relative to the total amount of the dielectric composition is preferably 99.0% by volume or more, more preferably 99.5% by volume or more, and may be 100% by volume.

[0048] Of the dielectric compositions according to the first and second embodiments, the dielectric composition according to the first embodiment is particularly preferred. In particular, when the specific olefin is 1,1-difluoroethylene, 1,1-difluoroethylene and carbon dioxide have similar boiling points, so that the composition undergoes little change in composition due to temperature changes and is easy to handle.

[0049] (Characteristics and Usage of Dielectric Composition) The dielectric composition of the present disclosure may be in a gaseous state at 25° C., or may be in a state in which gas and liquid coexist. It is desirable that the dielectric composition be in a gaseous state before being supplied to an electrical device and inside the electrical device.

[0050] In one embodiment, the dielectric composition is preferably in a single phase. The dielectric composition is preferably used in a single gaseous state. A single gaseous state means that the entire amount of the dielectric composition is in a gaseous state in a sealed container containing the dielectric composition. Furthermore, "used" here means that the dielectric composition is used for a desired purpose, such as an electrical insulating medium or an electric arc extinguishing medium, in a sealed container. By using the dielectric composition in a single gaseous state, changes in the volume ratio of each compound constituting the dielectric composition in the container can be suppressed. Furthermore, by using the dielectric composition in a single gaseous state, pressure changes due to temperature changes can be reduced.

[0051] It is preferable that the dielectric composition does not condense over the entire temperature range in which it is intended to be used. By using a specific olefin, the dielectric composition of the present disclosure can suppress condensation even when the temperature in use is relatively low.

[0052] From the viewpoint of having the dielectric composition exist only in a gas phase state, the condensation temperature of the dielectric composition is preferably 0°C or lower, more preferably -10°C or lower, even more preferably -20°C or lower, and particularly preferably -30°C or lower. From the viewpoint of economy, the condensation temperature of the dielectric composition may be -75°C or higher, or may be -70°C or higher. From such a viewpoint, the condensation temperature of the dielectric composition is preferably -75 to 0°C, more preferably -70 to -10°C, even more preferably -70 to -20°C, and particularly preferably -70 to -30°C.

[0053] From the viewpoint of stability, the moisture content of the dielectric composition is preferably 6000 ppm by mass or less, 5000 ppm by mass or less, 4000 ppm by mass or less, 3000 ppm by mass or less, 2500 ppm by mass or less, 1000 ppm by mass or less, 800 ppm by mass or less, 500 ppm by mass or less, 420 ppm by mass or less, 370 ppm by mass or less, 300 ppm by mass or less, 150 ppm by mass or less, 120 ppm by mass or less, 100 ppm by mass or less, 50 ppm by mass or less, 25 ppm by mass or less, or 20 ppm by mass or less. From the viewpoint of economy, the moisture content of the dielectric composition is preferably 3 ppm by mass or more, 5 ppm by mass or more, 7 ppm by mass or more, 10 ppm by mass or more, or 15 ppm by mass or more. From such viewpoints, the moisture content of the dielectric composition is preferably 3 to 6000 ppm by mass. The moisture content of the dielectric composition refers to a value measured by a dew point method. For example, the moisture content of the dielectric composition is measured by the method described in International Electrotechnical Commission (IEC) 60376:2005.

[0054] The use temperature of the dielectric composition is preferably higher than the condensation temperature of the dielectric composition in order to prevent condensation of the dielectric composition in a gaseous state. From the viewpoint of climate and use environment, the use temperature of the dielectric composition is preferably −75°C or higher, −70°C or higher, −60°C or higher, −50°C or higher, −40°C or higher, or −30°C or higher. When the temperature is −75°C or higher, liquefaction of specific olefins can be suitably suppressed. Furthermore, from the viewpoint of the design pressure of the equipment, the temperature is preferably 60°C or lower, 50°C or lower, 40°C or lower, 30°C or lower, 25°C or lower, or 20°C or lower. Here, the “use temperature” refers to the temperature of the gas in a sealed container containing the dielectric composition, and this temperature may vary over time depending, particularly, on climate or environmental conditions. In particular, the dielectric composition is preferably used at a temperature of −75°C to 60°C, more preferably −70 to 50°C, and even more preferably −60 to 40°C.

[0055] From the viewpoint of suppressing condensation, the working pressure of the dielectric composition is preferably a positive pressure at the ambient temperature. From this viewpoint, the working pressure of the dielectric composition is preferably 0.01 MPa or more, more preferably 0.02 MPa or more, and even more preferably 0.03 MPa or more, in terms of gauge pressure at −75° C. From the viewpoint of insulation properties, the dielectric composition is preferably filled at a higher pressure than sulfur hexafluoride. From this viewpoint, the working pressure of the dielectric composition is preferably 0.3 MPa or more, more preferably 0.4 MPa or more, and even more preferably 0.5 MPa or more, in terms of gauge pressure at 25° C.

[0056] The use of the dielectric composition is not particularly limited, and it is preferably used as an electrical insulating medium, an electric arc extinguishing medium, or the like. In one embodiment, the dielectric composition is used as an electrical insulating medium or an electric arc extinguishing medium contained in a sealed container in an electric device. The dielectric composition is particularly suitable as an electrical insulating medium and an electric arc extinguishing medium for medium-voltage or high-voltage electric devices. Details of the electric device are as described below.

[0057] In one embodiment, the electrical device of the present disclosure includes an electrical component, the dielectric composition of the present disclosure, and a sealed container containing the dielectric composition. Because the electrical device of the present disclosure uses the dielectric composition of the present disclosure, it has a low environmental impact, is easy to handle, and is highly safe.

[0058] The electrical equipment includes gas-insulated circuit breakers, current interruption equipment, gas-insulated transmission lines, gas-insulated transformers, gas-insulated substations, gas-insulated switchgears, gas-insulated disconnectors, gas-insulated load breakers, and particle accelerators.

[0059] It is advantageous to use a heating device in combination with an electrical device to ensure that the dielectric, thermal, and insulating properties of the dielectric composition are sufficient within the specified or desired temperature range. The heating device used depends on the temperature, pressure, or density of the dielectric composition. For example, a heating resistor ideally placed at the lowest point of the electrical device, where condensed liquid converges to various components inside the device due to gravity, can be used as the heating device. In this way, a gas pressure greater than the test pressure, which is the gas pressure inside the electrical device during the evaluation test specified by the standard, can be guaranteed. For the same reason, it is advantageous to insulate the walls of the electrical device, and, if necessary, to insulate the electrical device or the building housing the electrical device, and even to heat the electrical device or the building if necessary.

[0060] In order to maintain the purity of the dielectric and the performance of the device, an adsorbent, a desiccant, an acid scavenger, etc. may be enclosed in the sealed container. The adsorbent is preferably one that adsorbs organic substances in the dielectric and decomposition products of the dielectric that are generated during use. Examples of adsorbents include activated carbon, activated alumina, silica gel, zeolite, and metal oxides with adsorption function (CuO, Co ３ O ４ , MnO ２Examples of suitable desiccants include calcium carbonate, calcium sulfate (particularly drierite), calcium carbonate, calcium hydride, calcium chloride, potassium carbonate, potassium hydroxide, copper (II) sulfate, calcium oxide, magnesium, magnesium oxide, magnesium sulfate, magnesium perchlorate, sodium, sodium sulfate, aluminum, lithium aluminum hydride, aluminum oxide, activated alumina, montmorillonite, phosphorus pentoxide, silica gel, and cellulose filters. ... chloride, potassium carbonate, potassium hydroxide, copper (II) sulfate, calcium oxide, magnesium, magnesium oxide, magnesium sulfate, magnesium perchlorate, sodium, sodium sulfate, aluminum, lithium aluminum hydride, aluminum oxide, activated alumina, montmorillonite, phosphorus pentoxide, silica gel, and cellulose filters. Examples of suitable desiccants include calcium carbonate, calcium sulfate (particularly drierite), calcium hydride, calcium chloride, potassium chloride, potassium carbonate, potassium hydroxide, copper (II) sulfate, calcium oxide, magnesium, magnesium oxide, magnesium sulfate, magnesium perchlorate, sodium, sodium sulfate, aluminum, lithium aluminum hydride, aluminum oxide, activated alumina, montmorillonite, phosphorus pentoxide, silica

[0061] FIG. 1 shows an example of the configuration of an electric device according to one embodiment. A gas-insulated switchgear is shown as an example in FIG. 1 . The electric device 10 shown in FIG. 1 includes a metal tank (sealed container) 11 having a conductor member (electrical component) 12 disposed therein. The conductor member 12 is supported by a support member 13 in a state insulated from the metal tank 11. The metal tank 11 is an airtight container and contains a dielectric composition (not shown) therein. A high voltage is applied to the conductor member 12.

[0062] The surface of the conductor member 12 typically includes at least one selected from the group consisting of metals and metal oxides. The metal is preferably at least one selected from the group consisting of aluminum, copper, silver, tin, zinc, iron, and chromium, or an alloy including at least one selected from the group consisting of aluminum, copper, silver, tin, zinc, iron, and chromium. The metal oxide may be an oxide of the aforementioned metal or an oxide of another metal. The metal oxide is preferably at least one selected from the group consisting of zinc oxide, iron oxide, and aluminum oxide. The conductor member 12 may be made of multiple materials. For example, the core portion (i.e., the interior of the conductor member) may be made of a material other than metals and metal oxides. If the core portion of the conductor member is made of another material, at least a portion of the surface of the conductor member is coated with at least one selected from the group consisting of metals and metal oxides. It is preferred that at least a portion of the surface of the conductor member that comes into contact with the dielectric composition filled inside the metal tank 11 is made of at least one selected from the group consisting of metals and metal oxides.

[0063] The electrical equipment 10 may include various types of equipment electrically connected in series or parallel along an electrical circuit including the conductor member 12. Examples of such equipment include switches, circuit breakers, disconnectors, etc. for disconnecting electrical circuits; transformers, resistors, reactors, capacitors, etc. for changing the voltage of an electrical circuit; and insulated cables. A dielectric composition filled inside the metal tank 11 may be used to insulate the interior or exterior of such equipment, such as switches, circuit breakers, disconnectors, transformers, resistors, reactors, and capacitors. Furthermore, solid insulators, insulating oils, gel-like insulators, etc. may be used to insulate the interior or exterior of the equipment. The interior or exterior of the equipment may be insulated by a vacuum. Examples of solid insulators include insulating resin materials. Examples of insulating resin materials include thermoplastic resins and thermosetting resins. Examples of thermoplastic resins include vinyl chloride-based, polyester-based, and nylon-based resins. Examples of thermosetting resins include epoxy-based and urethane-based resins. Examples of insulating oils include mineral oils, vegetable oils, animal oils, and fluorinated oils. It should be noted that the electrical device of the present disclosure is not limited to the embodiment shown in FIG.

[0064] <Supply Method> In one embodiment, the supply method of the present disclosure includes supplying the dielectric composition of the present disclosure to an electric device. In the supply method of the present disclosure, the dielectric composition may be supplied into a sealed container provided in the electric device. When the dielectric composition is supplied, the dielectric composition may be in a liquid state, a gas state, or both, or may be in a critical state. When the dielectric composition is supplied into the sealed container, it may be filled as the dielectric composition, or the specific olefin and carbon dioxide or nitrogen may be filled separately.

[0065] Next, embodiments of the present disclosure will be described in detail using examples, but the embodiments of the present disclosure are not limited to these examples.

[0066] <Combustion Test> In the following examples, the flammability of the dielectric composition was evaluated by a combustion test. The combustion test was carried out by measuring the temperature rise inside the test container before and after ignition using a measuring device based on Explosion Limit Measurement Method A in Article 2, Paragraph 1, A and B of the General High Pressure Gas Safety Regulations. Ignition was carried out by discharge from an electrode placed in the center of the container. The discharge was carried out under ignition conditions of 16 kV, 50 mA, and 0.23 seconds. Details of the test conditions and evaluation criteria are as follows:

[0067] (Test conditions) Test vessel: 2 L capacity spherical stainless steel vessel Test gas: dielectric composition, dry air, and moisture Test temperature: 20°C ± 5°C or 60°C ± 5°C Test pressure: 101.3 kPa ± 0.7 kPa (absolute pressure) Moisture: 0.0088 g ± 0.0005 g per 1 g of dry air (amount of moisture at 50% relative humidity at 23°C) Ignition method: AC discharge, voltage 16 kV, current 50 mA, 0.23 seconds Electrode position: center of vessel, electrode spacing 4.0 mm Stirring conditions: 300 rpm, 10 minutes

[0068] (Evaluation criteria) - If the temperature rise in the test container before and after ignition is 50°C or more: Flame spread (flammable: A) - If the temperature rise in the test container before and after ignition is less than 50°C: Flame does not spread (non-flammable: B)

[0069] 1. CO to HFO-1132a ２ and N ２ Additive effect: Adds non-flammable CO to flammable HFO-1132a. ２ or N ２ After preparing the dielectric composition by adding HFO-1132a, water and dry air were further mixed to obtain air with a relative humidity of 50% at 23°C, and the temperature rise inside the test vessel before and after discharge ignition under the above test conditions (test temperature: 60°C ± 5°C) was observed. Note that in this test, only HFO-1132a (Nos. 1 to 3), HFO-1132a and CO ２ (No. 4 to 6), or HFO-1132a and N ２ The mixtures (Nos. 7 to 9) were regarded as dielectric compositions, and in order to confirm that the flammability of each dielectric composition is suppressed when it leaks into the air, dry air and air prepared with water were mixed and evaluated.

[0070] The mass ratio, volume ratio, and test results of each component are shown in the table below. In the table below, "mass ratio / dielectric composition" refers to the total amount of the dielectric composition (i.e., HFO-1132a, CO ２ , and N ２ The "volume ratio / (dielectric composition + air)" represents the mass ratio of each component when the total amount of the dielectric composition and air is taken as 100% by volume. From Nos. 4 to 9, the dielectric composition contains CO ２ or N ２ It was confirmed that the temperature rise inside the test vessel can be suppressed by adding

[0071]

[0072] 2. CO of HFO-1132a ２ Non-flammable by mixing HFO-1132a with CO ２ After preparing the dielectric composition by adding HFO-1132a and CO, water and dry air were further mixed to obtain air with a relative humidity of 50% at 23°C, and the temperature rise inside the test vessel before and after discharge ignition under the above test conditions was observed. ２ The mixture was regarded as a dielectric composition, and in order to confirm that non-flammability could be guaranteed even if each dielectric composition leaked into the air, air was mixed in a specified ratio and an evaluation was carried out.

[0073] The mass ratio, molar ratio, and volume ratio of each component, as well as the test results, are shown in Table 3 (test temperature: 20°C ± 5°C) and Table 4 (test temperature: 60°C ± 5°C). In the tables below, "mass ratio / dielectric composition" refers to the total amount of the dielectric composition (i.e., HFO-1132a and CO ２ The "molar ratio / dielectric composition" represents the mass ratio of each component when the total amount of the dielectric composition (i.e., the total amount of HFO-1132a and CO ２ The "volume ratio / (dielectric composition + air)" represents the volume ratio of each component when the total amount of the dielectric composition and air is taken as 100% by volume.

[0074]

[0075] Based on the results in Table 3, HFO-1132a and CO ２ CO relative to the total amount ２ The horizontal axis represents the content (mass%) of HFO-1132a and CO ２ , and HFO-1132a and CO relative to the total amount of air ２ The total content (volume %) of HFO-1132a and CO is plotted on the vertical axis in a graph shown in Figure 2. ２ It was confirmed that the flammable range was suppressed by adding HFO-1132a and CO. ２ CO ２ By making the amount of HFO-1132a and CO ２ It was found that a dielectric composition containing HFO-1132a and CO is non-flammable regardless of the ratio of HFO-1132a and CO ２ Contains HFO-1132a and CO ２ CO relative to the total amount ２ This shows that a dielectric composition having a content of 76.4 mass % or more can ensure non-flammability even when leaked into the air. ２ CO relative to the total amount ２ The right side of the dashed line (indicated as "non-combustible"; including 76.4% by mass) represents the range of the Examples, and the left side of the dashed line (indicated as "combustible"; not including 76.4% by mass) represents the range of the Comparative Examples.

[0076]

[0077] Based on the results in Table 4, HFO-1132a and CO ２ CO relative to the total amount ２ The horizontal axis represents the content (mass%) of HFO-1132a and CO ２ , and HFO-1132a and CO relative to the total amount of air ２ The total content (volume %) of HFO-1132a and CO is plotted on the vertical axis in a graph shown in Figure 3. ２ It was confirmed that the flammable range was suppressed by adding HFO-1132a and CO. ２CO ２ By making the amount of HFO-1132a and CO 79.5 mass % or more, ２ It was found that a dielectric composition containing HFO-1132a and CO is non-flammable regardless of the ratio of HFO-1132a and CO ２ Contains HFO-1132a and CO ２ CO relative to the total amount ２ This shows that a dielectric composition having a content of 79.5 mass % or more can ensure non-flammability even when leaked into the air. ２ CO relative to the total amount ２ This indicates that the content of

[0078] 3. N in HFO-1132a ２ Non-flammable by mixing HFO-1132a with N ２ After preparing the dielectric composition by adding HFO-1132a and N, water and dry air were further mixed to obtain air with a relative humidity of 50% at 23°C, and the temperature rise in the test vessel before and after discharge ignition under the above test conditions was observed. ２ The mixture was regarded as a dielectric composition, and in order to confirm that non-flammability could be guaranteed even if each dielectric composition leaked into the air, air was mixed in a specified ratio and an evaluation was carried out.

[0079] The mass ratio, molar ratio, and volume ratio of each component, as well as the test results, are shown in Table 5 (test temperature: 20°C ± 5°C) and Table 6 (test temperature: 60°C ± 5°C). In the tables below, "mass ratio / dielectric composition" refers to the total amount of the dielectric composition (i.e., HFO-1132a and N ２ The "molar ratio / dielectric composition" represents the mass ratio of each component when the total amount of the dielectric composition (i.e., the total amount of HFO-1132a and N ２ The "volume ratio / (dielectric composition + air)" represents the volume ratio of each component when the total amount of the dielectric composition and air is taken as 100% by volume.

[0080]

[0081] Based on the results in Table 5, HFO-1132a and N ２ N relative to the total amount of ２ The horizontal axis represents the content (mass%) of HFO-1132a, N ２ , and HFO-1132a and N relative to the total amount of air ２ The total content (volume %) of HFO-1132a is plotted on the vertical axis in Figure 4. ２ It was confirmed that the flammable range was suppressed by adding HFO-1132a and N. ２ For the total amount of ２ By making the amount of HFO-1132a and N ２ It has been found that a dielectric composition containing HFO-1132a and N is non-flammable regardless of the ratio of HFO-1132a and N ２ Contains HFO-1132a and N ２ N for the total amount of ２ 4 indicates that a dielectric composition having a content of 77.6 mass % or more can ensure non-flammability even when leaked into the air. ２ N relative to the total amount of ２ The right side of the dashed line (indicated as "non-combustible"; including 77.6% by mass) represents the range of the Examples, and the left side of the dashed line (indicated as "combustible"; not including 77.6% by mass) represents the range of the Comparative Examples.

[0082]

[0083] Based on the results in Table 6, HFO-1132a and N ２ N relative to the total amount of ２ The horizontal axis represents the content (mass%) of HFO-1132a, N ２ , and HFO-1132a and N relative to the total amount of air ２ The total content (volume %) of HFO-1132a is plotted on the vertical axis in Figure 5. ２ It was confirmed that the flammable range was suppressed by adding HFO-1132a and N ２ For the total amount of２ By making the amount of HFO-1132a and N ２ It has been found that a dielectric composition containing HFO-1132a and N is non-flammable regardless of the ratio of HFO-1132a and N ２ Contains HFO-1132a and N ２ N for the total amount of ２ 5 indicates that a dielectric composition having a content of 81.5 mass % or more can ensure non-flammability even when leaked into the air. ２ N relative to the total amount of ２ This indicates that the content of

[0084] Furthermore, when a similar test was carried out using HFO-1123 instead of HFO-1132a, the boundary value of the carbon dioxide or nitrogen content at which the dielectric composition became non-flammable was lowered.

[0085] As shown above, a dielectric composition with low flammability was obtained using HFO-1132a, which has a low GWP and a low boiling point.

[0086] The disclosure of Japanese Patent Application No. 2024-129226, filed on August 5, 2024, is incorporated herein by reference in its entirety. All documents, patent applications, and technical standards mentioned herein are incorporated herein by reference to the same extent as if each individual document, patent application, and technical standard was specifically and individually indicated to be incorporated by reference.

[0087] 10 Electrical device 11 Metal tank 12 Conductor member 13 Support member

Claims

1. A dielectric composition comprising a halogenated olefin having two carbon atoms and carbon dioxide, wherein the content of said carbon dioxide relative to the total amount of said halogenated olefin having two carbon atoms and said carbon dioxide is 76.4 mass% or more, or a halogenated olefin having two carbon atoms and nitrogen, wherein the content of said nitrogen relative to the total amount of said halogenated olefin having two carbon atoms and said nitrogen is 77.6 mass% or more, and the amount of oxygen relative to the total amount of said dielectric composition is less than 1.0 volume%.

2. A dielectric composition according to claim 1, comprising a halogenated olefin having two carbon atoms and carbon dioxide, wherein the content of said carbon dioxide relative to the total amount of said halogenated olefin having two carbon atoms and said carbon dioxide is 79.5 mass% or more, or a halogenated olefin having two carbon atoms and nitrogen, wherein the content of said nitrogen relative to the total amount of said halogenated olefin having two carbon atoms and said nitrogen is 81.5 mass% or more, wherein the amount of oxygen relative to the total amount of said dielectric composition is less than 1.0 volume%.

3. The dielectric composition of claim 1, wherein the halogenated olefin having two carbon atoms comprises at least one selected from the group consisting of 1,1-difluoroethylene, (E)-1,2-difluoroethylene, (Z)-1,2-difluoroethylene, and trifluoroethylene.

4. The dielectric composition according to claim 1, wherein said halogenated olefin having two carbon atoms is 1,1-difluoroethylene.

5. The dielectric composition according to claim 1, wherein the total content of the halogenated olefin having two carbon atoms and carbon dioxide relative to the total amount of the dielectric composition is 99.0% by volume or more, or the total content of the halogenated olefin having two carbon atoms and nitrogen relative to the total amount of the dielectric composition is 99.0% by volume or more.

6. The dielectric composition of claim 1, which is in a one-phase state.

7. The dielectric composition according to claim 1, which is used as at least one selected from the group consisting of an electrical insulating medium and an electrical arc extinguishing medium.

8. An electric device comprising an electric component, the dielectric composition according to any one of claims 1 to 7, and a sealed container containing the dielectric composition.

9. The electric device according to claim 8, which is a gas-insulated circuit breaker, current interrupting equipment, gas-insulated transmission line, gas-insulated transformer, gas-insulated substation, gas-insulated switchgear, gas-insulated disconnector, gas-insulated load breaker, or particle accelerator.

10. A method for supplying the dielectric composition according to any one of claims 1 to 7 to an electrical device.

11. Use of the dielectric composition according to any one of claims 1 to 7, wherein the dielectric composition is used at a temperature of -75°C to 60°C.

12. Use of the dielectric composition according to any one of claims 1 to 7 as an electrical insulating medium or an electrical arc extinguishing medium.

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