CN112489852A - Mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof - Google Patents
Mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof Download PDFInfo
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- CN112489852A CN112489852A CN202011439724.8A CN202011439724A CN112489852A CN 112489852 A CN112489852 A CN 112489852A CN 202011439724 A CN202011439724 A CN 202011439724A CN 112489852 A CN112489852 A CN 112489852A
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- heptafluoroisobutyronitrile
- arc
- extinguishing medium
- mixed gas
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- AASDJASZOZGYMM-UHFFFAOYSA-N 2,3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile Chemical compound FC(F)(F)C(F)(C#N)C(F)(F)F AASDJASZOZGYMM-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 8
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004341 Octafluorocyclobutane Substances 0.000 claims abstract description 15
- 235000019407 octafluorocyclobutane Nutrition 0.000 claims abstract description 15
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 238000011049 filling Methods 0.000 claims description 9
- 229910018503 SF6 Inorganic materials 0.000 abstract description 21
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 abstract description 5
- 229960000909 sulfur hexafluoride Drugs 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 112
- 230000000052 comparative effect Effects 0.000 description 8
- 238000011010 flushing procedure Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 231100000053 low toxicity Toxicity 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QYSGYZVSCZSLHT-UHFFFAOYSA-N octafluoropropane Chemical compound FC(F)(F)C(F)(F)C(F)(F)F QYSGYZVSCZSLHT-UHFFFAOYSA-N 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- UXPOJVLZTPGWFX-UHFFFAOYSA-N pentafluoroethyl iodide Chemical compound FC(F)(F)C(F)(F)I UXPOJVLZTPGWFX-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/16—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
Abstract
The invention relates to a mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and a preparation method thereof, wherein the mixed gas arc-extinguishing medium mainly comprises heptafluoroisobutyronitrile and octafluorocyclobutane (C-C)4F8) And carbon tetrafluoride (CF)4) The composition comprises the following components in percentage by volume: 20 to 25 percent of C4F7N, 5% -10% of C-C4F870% CF4. The mixed gas arc-extinguishing medium can be used for replacing sulfur hexafluoride (SF)6) The novel environment-friendly arc extinguishing medium is applied to medium and low voltage armored metal-enclosed switchgear.
Description
Technical Field
The invention relates to an arc extinguishing medium, in particular to a mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and a preparation method thereof.
Background
The gas-insulated medium-low voltage electrical equipment usually adopts SF6As an arc-extinguishing medium. But SF6Is a strong greenhouse gas, and the Global Warming Potential (GWP) of the gas is CO223900 times of and due to SF6Has extremely stable chemical properties, can exist in the atmosphere for as long as 3200 years, basically does not naturally decompose once leaked into the atmosphere, and therefore has cumulative effect on the influence of global warming. In the Kyoto protocol, signed in 1997, CO was well-defined2，CH4，N2O, PFC, HFC and SF6The method belongs to the range of greenhouse gases, and requires developed countries to freeze the discharge of greenhouse gases at the level of 90 s in the 20 th century first, and to use or forbid SF according to the standard limit of 20206A gas.
Therefore, it is highly desirable to find a suitable environment-friendly arc-extinguishing medium to replace SF6Not only ensure with SF6Has similar arc extinguishing performance, meets the industrial use requirements of no toxicity, no flammability and the like, and does not have negative influence on the environment.
In view of this, the researchers suggested using SF6Mixing with buffer gas to relieve SF6The adverse effect of the gas on the environment. However, since the arc extinguishing capability of the mixed gas is reduced, the pressure is required to be increased to ensure the arc extinguishing effect, which will undoubtedly increase the difficulty and cost of the manufacturing process, and put forward more strict requirements on the leakage prevention level and safety index of the equipment. To solve the problem of SF6Gas (es)The problems of serious greenhouse effect and unfriendliness to the environment are solved, and the suitable SF is found6Replacement of the insulating gas is the most thorough and effective solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mixed gas arc-extinguishing medium containing an environment-friendly gas of heptafluoroisobutyronitrile and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a mixed gas arc-extinguishing medium containing an environment-friendly gas of heptafluoroisobutyronitrile comprises the following components in percentage by volume: heptafluoroisobutyronitrile gas (C)4F7N) 20-25%, octafluorocyclobutane gas (C-C)4F8) 5-10% of carbon tetrafluoride gas (CF) in balance4)。
Preferably, the purity of the heptafluoroisobutyronitrile gas is greater than or equal to 99%.
Preferably, the purity of the octafluorocyclobutane gas is greater than or equal to 99.99%.
Preferably, the purity of the carbon tetrafluoride gas is greater than or equal to 99.99%.
The preparation method of the mixed gas arc-extinguishing medium containing the environment-friendly gas of heptafluoroisobutyronitrile preferably comprises the following steps of:
(1) taking a closed container, wherein the bottom of the closed container is provided with a high vacuum valve and a bottom inflation valve, and the top of the closed container is provided with a top inflation valve;
(2) vacuumizing a closed container through a high vacuum valve, filling heptafluoroisobutyronitrile gas and octafluorocyclobutane gas from a top inflation valve, filling carbon tetrafluoride gas from a bottom inflation valve, filling the gas components according to the set content, and mixing uniformly to obtain the target product.
Preferably, in the step (2), the vacuum degree in the closed container is such that the vacuum state is reduced to 10Pa or less.
Preferably, in the step (2), in the inflation process, heptafluoroisobutyronitrile gas and octafluorocyclobutane gas are inflated from the top inflation valve, and then carbon tetrafluoride gas is inflated from the bottom inflation valve.
In the invention, C is used4F7N, octafluorocyclobutane and CF4A mixed gas of composition wherein C4F7N is also excellent in electrical properties. Under the same air pressure, the insulation strength can reach more than 2 times of sulfur hexafluoride, and the arc extinguishing capability is slightly different according to the magnitude of the on-off current. The component gas C4F7The decomposition products of N in the case of current interruption are mainly C2F6,，C2F4,，C2F5I，C3F8,CHF3，C3F6All belong to low-toxicity or non-toxicity substances. Octafluorocyclobutane, a colorless, odorless, non-flammable gas; GWP value is SF61/3 of (1) and 8700. And SF6Compared with less influence on the environment. The gas is completely nontoxic, has no ozone influence, and is pure C-C4F8The dielectric strength of a gas under a uniform electric field is about SF61.3 times of gas. Component CF4The buffer gas is mainly used for reducing the liquefaction temperature of the mixed gas and enhancing the overall arc extinguishing performance. The liquefaction temperature of the mixed gas finally formed by the invention can be reduced to about minus 40 ℃, and the use requirements of most areas in China can be met.
The environment-friendly mixed gas arc-extinguishing medium provided by the invention can well meet the use requirements of the existing medium-voltage armored metal-enclosed switchgear and has the characteristics of excellent arc-extinguishing performance and good environment-friendly performance.
Compared with the prior art, the invention has the following advantages:
(1) the environmental protection performance is excellent. C4F7N has a greenhouse effect index of CO22100 times of, and SF6Compared with 23900, it is almost negligible. At the same time, C4F7N and CF4Has no greenhouse damage potential and can not cause any damage to the ozone layer.
(2) The arc extinguishing capability is excellent. At short-circuit fault current in near zone with cut-off peak value of 1kA, C4F7N-c-C4F8-CF4Mixed gas extinguishingArc capability with C4F7The increase in the proportion of N gas increases exponentially.
(3) Has little harm to human body. The decomposition products of the environment-friendly mixed gas arc-extinguishing medium provided by the invention are all nontoxic or low-toxicity substances when the current is switched on and off, and can not cause serious harm to human bodies.
The preparation method provided by the invention emphasizes the sequence and the position of inflation, namely C with high density4F7N、 c-C4F8The gas is filled into the closed container from the top, the density of the CF is small4The gas is filled from the bottom, so that the mixing and standing time can be reduced, and the gas can be mixed more uniformly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is C4F7N/CF4The current breaking capability of the mixed gas is compared with the circuit breaking capability of the SF6 gas.
FIG. 2 is C4F7N/c-C4F8/CF4The current breaking capability of the mixed gas is compared with the circuit breaking capability of the SF6 gas.
Detailed Description
A mixed gas arc-extinguishing medium containing an environment-friendly gas of heptafluoroisobutyronitrile comprises the following components in percentage by volume: heptafluoroisobutyronitrile gas (C)4F7N) 20-25%, octafluorocyclobutane gas (C-C)4F8) 5-10% of carbon tetrafluoride gas (CF) in balance4)。
In a preferred embodiment of the present invention, the purity of the heptafluoroisobutyronitrile gas is 99% or more.
In a preferred embodiment of the present invention, the purity of the octafluorocyclobutane gas is 99.99% or higher.
In a preferred embodiment of the present invention, the carbon tetrafluoride gas has a purity of 99.99% or higher.
The preparation method of the mixed gas arc-extinguishing medium containing the environment-friendly gas of heptafluoroisobutyronitrile preferably comprises the following steps of:
(1) taking a closed container, wherein the bottom of the closed container is provided with a high vacuum valve and a bottom inflation valve, and the top of the closed container is provided with a top inflation valve;
(2) vacuumizing a closed container through a high vacuum valve, filling heptafluoroisobutyronitrile gas and octafluorocyclobutane gas from a top inflation valve, filling carbon tetrafluoride gas from a bottom inflation valve, filling the gas components according to the set content, and mixing uniformly to obtain the target product.
In a preferred embodiment of the present invention, in the step (2), the degree of vacuum in the closed vessel is such that a vacuum state of 10Pa or less is obtained.
In a preferred embodiment of the present invention, in the step (2), during the inflation process, heptafluoroisobutyronitrile gas and octafluorocyclobutane gas are charged from the top inflation valve, and then carbon tetrafluoride gas is charged from the bottom inflation valve.
The selection of the type and amount of each gas in the present invention is for the following reasons: c4F7N/CF4Mixed gas, C4F7N/c-C4F8/CF4Current breaking capacity of mixed gas and SF6The gas current breaking capability is shown in fig. 1 and 2, and C is shown in the figure4F7N/CF4Current breaking capacity of the mixed gas is C4F7At an N content of 20% substantially saturated with C4F7After the N content exceeds 20 percent, the C content is continuously increased4F7The N gas content current breaking capability remains substantially unchanged. At C4F7N/CF4Fixation of CF in mixed gas4After the gas content is 70%, C is reduced4F7N gas content, C-C addition4F8The current breaking capability of the post-mixed gas is shown in FIG. 2, from which it can be seen that C-C is added4F8The current breaking capacity of the gas post-mixed gas is improved at C-C4F8The current breaking capacity of the mixed gas is substantially saturated when the mixed gas reaches 10%, so that C-C4F8The whole improvement on the current breaking capacity of the mixed gas is small after the content is higher than 10 percent, because of the C-C4F8The GWP of the gas is 8700, and the environment-friendly performance of the mixed gas is reduced by increasing the content of the gas too much.
The present invention will be described in detail with reference to specific examples.
Example 1
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7The volume fraction of N is 20%, C-C4F8Is 10% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hours and uniformly mixing.
Example 2
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7The volume fraction of N is 21%, C-C4F8Is 9% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hours and uniformly mixing.
Example 3
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7The volume fraction of N is 22%, C-C4F8Is 8% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hours and uniformly mixing.
Example 4
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7The volume fraction of N is 23%, C-C4F8Is 7% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hours and uniformly mixing.
Example 5
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7The volume fraction of N is 24%, C-C4F8Is 6% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hoursAnd (4) uniformly mixing.
Example 6
Get C4F7N、c-C4F8And CF4Physical mixing is carried out at normal temperature to obtain an environment-friendly mixed gas arc extinguishing medium, and C is contained in the arc extinguishing medium4F7A volume fraction of N of 25%, C-C4F8Is 5% by volume, CF4Is 70% by volume. The method for obtaining the environment-friendly arc-extinguishing medium comprises the steps of pumping the closed container to a vacuum state below 10Pa in a metal sealed container with any height less than 30m, and then sequentially flushing C-C4F8、 C4F7N、CF4A gas. Standing the mixed gas for 48 hours and uniformly mixing.
The mixed gas arc extinguishing media prepared in examples 1-6 above were mixed with conventional SF6The results of the comparative analysis of the relevant properties are shown in the following table:
therefore, the environment-friendly mixed insulating gas provided by the invention can reach SF6The arc extinguishing performance is equivalent, the environmental influence is obviously reduced or even eliminated, and meanwhile, the liquefaction temperature can meet the requirements of the current engineering application.
Comparative example 1
Compared with the embodiment 1, except that the volume percentage of each component gas in the arc-extinguishing medium is as follows: c4F7N volume fraction of 10%, C-C4F8Is 20% by volume, CF4The same applies to the rest, except for 70%.
Comparative example 2
Compared with the embodiment 1, except that the volume percentage of each component gas in the arc-extinguishing medium is as follows: c4F729% by volume of N, C-C4F8Is 1% by volume, CF4The same applies to the rest, except for 70%.
Comparative example 3
Compared with the embodiment 1, except that the volume percentage of each component gas in the arc-extinguishing medium is as follows: c4F7N volume fraction of 30%, CF4The same applies to the rest, except for 70%.
Comparative example 4
Compared with the embodiment 1, except that the volume percentage of each component gas in the arc-extinguishing medium is as follows: C-C4F830% by volume of (C), CF4The same applies to the rest, except for 70%.
The mixed gas arc-extinguishing media prepared in comparative examples 1 to 4 were mixed with conventional SF6The results of the comparative analysis of the relevant properties are shown in the following table:
as can be seen from the above table, when C-C4F8At lower ratios (comparative examples 2 and 3), SF is comparable to the same conditions6The arc extinguishing capability of the arc extinguishing chamber is lower, only about 0.86, when the arc extinguishing chamber is C-C4F8Higher content of C4F7When the proportion of the N gas is low (comparative example 1 and comparative example 4), the GWP value of the mixed gas is high, the environment is greatly influenced, the environmental protection performance is reduced, and the arc extinguishing capability is basically saturated and is not obviously improved.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. The mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile is characterized by comprising the following components in percentage by volume: 20-25% of heptafluoroisobutyronitrile gas, 5-10% of octafluorocyclobutane gas and the balance of carbon tetrafluoride gas.
2. The mixed gas arc-extinguishing medium containing heptafluoroisobutyronitrile as an environmentally friendly gas according to claim 1, wherein the purity of the heptafluoroisobutyronitrile gas is greater than or equal to 99%.
3. The mixed gas arc-extinguishing medium containing heptafluoroisobutyronitrile as an environmentally friendly gas of claim 1, wherein the purity of octafluorocyclobutane gas is greater than or equal to 99.99%.
4. The mixed gas arc-extinguishing medium containing the environment-friendly gas heptafluoroisobutyronitrile according to claim 1, wherein the purity of the carbon tetrafluoride gas is greater than or equal to 99.99%.
5. The method for preparing the mixed gas arc-extinguishing medium containing the environment-friendly gas heptafluoroisobutyronitrile according to any one of claims 1 to 4, comprising the following steps:
(1) taking a closed container, wherein the bottom of the closed container is provided with a high vacuum valve and a bottom inflation valve, and the top of the closed container is provided with a top inflation valve;
(2) vacuumizing a closed container through a high vacuum valve, filling heptafluoroisobutyronitrile gas and octafluorocyclobutane gas from a top inflation valve, filling carbon tetrafluoride gas from a bottom inflation valve, filling the gas components according to the set content, and mixing uniformly to obtain the target product.
6. The method according to claim 5, wherein in step (2), the degree of vacuum in the closed vessel is such that the vacuum is below 10 Pa.
7. The method according to claim 5, wherein in the step (2), during the charging process, the heptafluoroisobutyronitrile gas and the octafluorocyclobutane gas are charged from a top charging valve, and then the carbon tetrafluoride gas is charged from a bottom charging valve.
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| CN102136311A (en) * | 2010-11-10 | 2011-07-27 | 中国科学院电工研究所 | Mixed gas insulating medium |
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| US20160241004A1 (en) * | 2013-09-20 | 2016-08-18 | Alstom Technology Ltd | Gas-insulated medium or high-voltage electrical apparatus including carbon dioxide, oxygen, and heptafluoro-isobutyronitrile |
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| CN107968350A (en) * | 2017-10-24 | 2018-04-27 | 上海交通大学 | A kind of mixed gas arc-extinguishing medium of the trifluoroiodomethane of gas containing environment-friendly type and preparation method thereof |
| CN109300575A (en) * | 2018-09-25 | 2019-02-01 | 上海交通大学 | The mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type |
-
2020
- 2020-12-10 CN CN202011439724.8A patent/CN112489852A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136311A (en) * | 2010-11-10 | 2011-07-27 | 中国科学院电工研究所 | Mixed gas insulating medium |
| CN104798274A (en) * | 2012-09-10 | 2015-07-22 | 阿尔斯通技术有限公司 | Medium- or high-voltage electrical appliance having a low environmental impact and hybrid insulation |
| US20160241004A1 (en) * | 2013-09-20 | 2016-08-18 | Alstom Technology Ltd | Gas-insulated medium or high-voltage electrical apparatus including carbon dioxide, oxygen, and heptafluoro-isobutyronitrile |
| CN107430901A (en) * | 2015-02-13 | 2017-12-01 | 通用电气技术股份有限公司 | Gas-insulated medium-pressure or high pressure electrical equipment comprising seven fluorine isobutyronitriles and tetrafluoromethane |
| CN107968350A (en) * | 2017-10-24 | 2018-04-27 | 上海交通大学 | A kind of mixed gas arc-extinguishing medium of the trifluoroiodomethane of gas containing environment-friendly type and preparation method thereof |
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