CN114121343B - Binary mixed gas insulating medium, application thereof and electric power equipment containing gas insulating medium - Google Patents
Binary mixed gas insulating medium, application thereof and electric power equipment containing gas insulating medium Download PDFInfo
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- CN114121343B CN114121343B CN202111243224.1A CN202111243224A CN114121343B CN 114121343 B CN114121343 B CN 114121343B CN 202111243224 A CN202111243224 A CN 202111243224A CN 114121343 B CN114121343 B CN 114121343B
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
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Abstract
The invention discloses a binary mixed gas insulating medium, application thereof and electric power equipment containing the gas insulating medium, and relates to the field of electric power. The gas insulation medium comprises fluorine-containing olefin gas and saturated fluorine-containing alkane gas, wherein the fluorine-containing olefin gas is HFO-1336mzz (E), the saturated fluorine-containing alkane gas is R-134, and the gas insulation medium is applied to the field of power equipment. According to the application, a certain amount of saturated fluorine-containing alkane gas is added, so that the gas phase partial pressure of a main insulating medium HFO-1336mzz (E) can be remarkably improved, meanwhile, due to the synergistic effect of the two, the insulating strength of the binary mixed medium is remarkably improved, and the binary mixed medium has a low GWP value and is good in environmental protection effect.
Description
Technical Field
The invention relates to the field of electric power, in particular to a binary mixed gas insulating medium, application thereof and electric power equipment containing the gas insulating medium.
Background
The medium used for insulating, extinguishing arc or isolating transmission conductor and cavity shell in gas-insulated power equipment is sulfur hexafluoride (SF) 6 ) The excellent arc extinguishing and insulating properties of the dielectric material make the dielectric material become the most widely applied gas dielectric in compressed gas type electric equipment such as insulated closed type combined switches, gas insulated circuit breakers, gas insulated power transmission pipelines and the like at present. However, the main disadvantage is the greater environmental hazard, embodied in thatGlobal Warming Potential (GWP) of CO 2 23900 times (on a 100 year time scale) and a longer residence time in the atmosphere of 3200 years. Therefore, SF is sought 6 The dielectric medium can be used as a common appeal for power equipment manufacturers and scientific researchers in the power field at home and abroad.
The first generation of substitute gases selected to fill equipment with nitrogen, compressed air or carbon dioxide at a higher pressure, but these gases often had lower insulating properties than SF 6 . Therefore, in practical applications, the gas is often filled with a high pressure gas, so that the requirement of the strength of the equipment shell under the high pressure has to be met by increasing the volume of the equipment. This also increases the cost of the apparatus, and is not in accordance with the recent requirements for miniaturization, small size, economy, and the like, and therefore is not recommended.
Such as CF has emerged in recent years 3 I、C 3 F 7 CN、C 2 F 5 CN、CF 3 CN、C 4 F 7 N, HFO-1234ze (E), HFO-1234yf and other novel potential substitute gases. CF was found in subsequent studies 3 I often precipitates iodine simple substance under the defects of discharge, breakdown and the like to seriously affect the insulating property, and is classified as a third type of toxic substance and cannot be used in the power industry. C 3 F 7 CN、C 2 F 5 CN、CF 3 The perfluoronitrile gas such as CN has excellent insulating property, and partial discharge or thermal decomposition products thereof have high toxicity, so that the perfluoronitrile gas is used with caution. In addition, the GWP of such gases tends to be higher. With C 4 F 7 For example, the GWP of N is about 2100, and the environmental protection benefit still needs to be improved. HFO-1234ze (E), HFO-1234yf and other novel refrigerants have excellent environmental characteristics, often have low GWP values, but have high liquefaction temperature and insulating property and SF 6 Equal to or lower than SF 6 Therefore, the application range is limited. The development of a gas insulation medium which is environment-friendly, non-toxic and excellent in insulation performance is urgently needed.
Disclosure of Invention
The invention provides a binary mixed gas insulating medium, application thereof and electric equipment containing the gas insulating medium, so as to improve the insulating property and the environmental protection property of the gas insulating medium.
In order to solve the above technical problems, one of the objects of the present invention is to provide a binary mixed gas insulation medium comprising a fluorine-containing olefin gas and a saturated fluorine-containing alkane gas, wherein the fluorine-containing olefin gas is HFO-1336mzz (e).
HFO-1336mzz (E) is used as an insulating medium, which has the advantages of non-toxicity and non-flammability. However, since pure HFO-1336mzz (e) is filled in power equipment in cooperation with a background gas, the filling amount is limited under a specific operating temperature limit, resulting in poor insulation performance. The application has the advantage that the synergistic effect of the binary mixed medium greatly improves the insulation strength by adding a certain amount of saturated fluorine-containing hydrocarbon gas into HFO-1336mzz (E) in an auxiliary way. The binary mixed medium has low GWP value, good environmental protection effect, low price of saturated fluorine-containing alkane gas, economic cost saving and application range expansion.
Preferably, the saturated fluorine-containing alkane gas is one of R-134, R-134a, R-125a and HFC-32.
Preferably, the saturated fluorine-containing alkane gas is R-134.
Preferably, the molar fraction of the saturated fluorine-containing alkane gas is 20% to 50%.
By adopting the scheme, the addition amount of the saturated fluorine-containing alkane gas is controlled within the range, so that the insulation strength of the gas insulation medium reaches a better level, and meanwhile, the gas insulation medium has a lower GWP value and extremely low toxicity, meets the green environmental protection concept, and improves the comprehensive performance of the gas insulation medium.
Preferably, the molar fraction of the saturated fluorine-containing alkane gas in the gas insulation medium is 20% to 40%.
By adopting the scheme, when pure HFO-1336mzz (E) is matched with background gas and filled into electric power equipment, the filling amount is limited under the limit of specific operation temperature, the addition amount of saturated fluorine-containing alkane gas is controlled within the range, the allowable filling amount of the HFO-1336mzz (E) is increased, and the steam partial pressure of the HFO-1336mzz (E) in the gas insulation medium can be improved, so that the liquefaction temperature is reduced, the comprehensive performance of the gas insulation medium is further improved, and the application range is expanded.
Preferably, the molar fraction of the saturated fluorine-containing alkane gas in the gas insulation medium is 30%.
In order to solve the above technical problem, a second object of the present invention is to provide an application of a binary mixed gas insulating medium, which is applied to the field of power equipment.
In order to solve the above technical problem, it is a third object of the present invention to provide an electric power device including a gas insulating medium, wherein the gas insulating medium is a binary mixed gas insulating medium.
Preferably, the gas insulation medium is mixed with background gas and then added into the power equipment, and the background gas comprises CO 2 、N 2 And Air.
Preferably, when the operating environment temperature of the power equipment is-25-40 ℃, the mole fraction of the saturated fluorine-containing alkane gas is 20-50%.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
1. HFO-1336mzz (E) is used as an insulating medium, and has the advantages of excellent insulating property, no toxicity, no flammability, low GWP and the like. The liquefaction temperature of the main insulating gas HFO-1336mzz (e) is reduced by adding an amount of saturated fluorine-containing alkane gas, thereby increasing the allowable loading of HFO-1336mzz (e) at a specific operating temperature. And the synergistic effect of the two greatly improves the insulation strength of the binary mixed medium.
2. When the mole fraction of the added saturated fluorine-containing alkane gas is in the range of 20-50%, the highest insulation strength of the gas insulation medium can be more than 1.3 times of HFO-1336mzz (E), which is higher than SF 6 2 times of the total weight of the composition. The binary mixed gas has good environmental protection effect and low price. The binary mixed gas insulating medium and the background gasWhen the composite insulation material is matched with and filled into power equipment, the economic cost is saved, and the composite insulation material has good environmental protection benefit and insulation performance, so that the overall performance is integrally and effectively improved.
Drawings
FIG. 1 is a schematic molecular structure diagram of HFO-1336mzz (E) as a binary mixed gas insulation medium in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view showing the molecular structure of R-134 of a binary mixed gas insulating medium according to an embodiment of the present invention;
FIG. 3-results of measurements of saturated vapor pressures of the gas insulating mediums at-5 deg.C, -15 deg.C and-25 deg.C in inventive preparations 1-8 and comparative preparations 1-2;
FIG. 4-results of partial pressure measurements of steam at-5 ℃ ambient temperature for different gases in inventive preparations 1-8 and comparative preparations 1-2;
FIG. 5-results of measuring partial pressures of steam at an ambient temperature of-15 ℃ for different gases in inventive preparations 1 to 8 and comparative preparations 1 to 2;
FIG. 6-results of measuring partial pressures of steam at an ambient temperature of-25 ℃ for different gases in inventive preparations 1 to 8 and comparative preparations 1 to 2;
FIG. 7-Critical breakdown field strengths of gas insulation media in inventive examples 1-8 and comparative preparation examples 1-2;
figure 8-results of GWP value measurement of gas insulation media in examples 1 to 8 of the present invention and comparative preparation examples 1 to 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
HFO-1336mzz (E) has received attention from the power field as a novel gas-insulated dielectric having an insulating property of not less than SF 6 1.5 times of gas, has GWP of 18, and has non-toxic and non-flammable propertiesODP of 0, etc., with conventional background gases such as dry Air (Air), nitrogen (N) 2 ) Carbon dioxide (CO) 2 ) And the like can be applied to the power equipment after mixing. But because of its higher boiling point (about 7.5 c), the saturated vapor pressure at low temperatures is lower, limiting its range of applicability.
The binary mixed gas insulating medium is prepared by mixing HFO-1336mzz (E) serving as a main insulating medium and R-134 (tetrafluoroethane) serving as a buffer medium. The liquefaction temperature of HFO-1336mzz (E) can be reduced, thereby increasing the steam partial pressure of HFO-1336mzz (E) when the gas insulation medium is at different environmental temperatures, and simultaneously, the synergistic effect of the two greatly improves the insulation strength of the gas insulation medium. The mixed gas insulating medium is mixed with a background gas such as dry Air (Air) or nitrogen (N) 2 ) Carbon dioxide (CO) 2 ) The gas insulation medium can be applied to power equipment after being mixed, can be applied under the condition that the conventional operation temperature of the power equipment is-25-40 ℃, and has wide application range.
Preparation example 1
A binary mixed gas insulation medium comprises 10% of HFO-1336mzz (E) and 90% of R-134, wherein the molecular structure of HFO-1336mzz (E) is shown in figure 1, and the molecular structure of R-134 is shown in figure 2.
Preparation example 2
A binary mixed gas insulating medium comprises 20 mole percent of HFO-1336mzz (E) and 80 mole percent of R-134, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1, and the molecular structure of the R-134 is shown in figure 2.
Preparation example 3
A binary mixed gas insulating medium comprises 30 mole percent of HFO-1336mzz (E) and 70 mole percent of R-134, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1, and the molecular structure of the R-134 is shown in figure 2.
Preparation example 4
A binary mixed gas insulation medium comprises 40% of HFO-1336mzz (E) and 60% of R-134, wherein the molecular structure of HFO-1336mzz (E) is shown in figure 1, and the molecular structure of R-134 is shown in figure 2.
Preparation example 5
A binary mixed gas insulation medium comprises 50% of HFO-1336mzz (E) and 50% of R-134 by mole fraction, wherein the molecular structure of HFO-1336mzz (E) is shown in figure 1, and the molecular structure of R-134 is shown in figure 2.
Preparation example 6
A binary mixed gas insulating medium comprises 60% of HFO-1336mzz (E) and 40% of R-134, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1, and the molecular structure of the R-134 is shown in figure 2.
Preparation example 7
A binary mixed gas insulation medium comprises 70% of HFO-1336mzz (E) and 30% of R-134 by mole fraction, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1, and the molecular structure of the R-134 is shown in figure 2.
Preparation example 8
A binary mixed gas insulating medium comprises 80% of HFO-1336mzz (E) and 20% of R-134, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1, and the molecular structure of the R-134 is shown in figure 2.
Preparation example 9
A binary mixed gas insulation medium comprises 80% of HFO-1336mzz (E) and 20% of R-134a (tetrafluoroethane) in mole fraction, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1.
Preparation example 10
A binary mixed gas insulating medium comprises 70% of HFO-1336mzz (E) and 30% of R-125a (pentafluoroethane) in a molar fraction, wherein the molecular structure of the HFO-1336mzz (E) is shown in figure 1.
Preparation example 11
A binary mixed gas insulation medium comprises 60% of HFO-1336mzz (E) and 40% of HFC-32 (difluoromethane) in mole fraction, and the molecular structure of the HFO-1336mzz (E) is shown in figure 1.
Example 1
Electric power equipment containing binary mixed gas insulating medium, gas insulating medium prepared in preparation example 1 in electric power equipment, and operating environment of electric power equipmentThe temperature is-5 ℃ to 40 ℃, and the gas insulation medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, when the saturated vapor pressure of the gas insulating medium was 1.712bar, N was 2 Has a vapor pressure of 2.288bar, N 2 The molar fraction added was 57.2%.
Example 2
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 1, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 1.131bar, and CO is added 2 Has a vapor pressure of 5.869bar, CO 2 The molar fraction of addition of (b) was 83.8%.
Example 3
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 2, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium is 1.571bar, and N is 2 Has a vapor pressure of 2.429bar, N 2 Is 60.7% by mole.
Example 4
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 2, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 1.032bar, and CO is 2 Has a vapor pressure of 5.968bar, CO 2 The mole fraction added was 85.3%.
Example 5
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 2, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Are mixed so as to beThe air pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium is 0.652bar, and N is 2 Has a vapor pressure of 6.348bar, N 2 The mole fraction added was 90.7%.
Example 6
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 3, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium is 1.424bar, and N is 2 Has a vapor pressure of 2.576bar, N 2 The mole fraction added was 64.4%.
Example 7
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 3, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium was 0.929bar, and CO 2 Has a vapor pressure of 6.071bar, CO 2 The mole fraction added was 86.7%.
Example 8
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 3, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium was 0.582bar, and N was 2 Has a vapor pressure of 6.418bar, N 2 The mole fraction added was 91.7%.
Example 9
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 4, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. The saturated vapor pressure of the gas-insulating medium at this time was 1.276barThen N is 2 Has a vapor pressure of 2.724bar, N 2 The molar fraction added was 68.1%.
Example 10
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 4, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 0.826bar, and CO is 2 Has a vapor pressure of 6.174bar, CO 2 The mole fraction added was 88.2%.
Example 11
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 4, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium was 0.513bar, and N was calculated 2 Has a vapor pressure of 6.487bar, N 2 The mole fraction added was 92.7%.
Example 12
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 5, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium is 1.133bar, and N is 2 Has a vapor pressure of 2.867bar, N 2 The mole fraction added was 71.7%.
Example 13
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 5, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 0.728bar, and CO is 2 Has a vapor pressure of 6.272bar, CO 2 The mole fraction of the additive is 89.6％。
Example 14
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 5, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium is 0.448bar, and N is 2 Has a vapor pressure of 6.552bar, N 2 The mole fraction added was 93.6%.
Example 15
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 6, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium is 1.001bar, and N is 2 Has a vapor pressure of 2.999bar, N 2 The mole fraction added was 75.0%.
Example 16
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 6, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium was 0.639bar, and CO was added 2 Has a vapor pressure of 6.361bar, CO 2 The molar fraction added was 90.1%.
Example 17
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 6, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium is 0.391bar, N 2 Has a vapor pressure of 6.609bar, N 2 The mole fraction added was 94.4%.
Example 18
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 7, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium was 0.819bar, and N was calculated 2 Has a vapor pressure of 3.109bar, N 2 The molar fraction added was 77.7%.
Example 19
An electric power equipment containing binary mixed gas insulating medium, wherein the electric power equipment contains the gas insulating medium prepared in preparation example 7, the operating environment temperature of the electric power equipment is-15-40 ℃, and the gas insulating medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 0.560bar, and CO is added 2 Has a vapor pressure of 6.440bar, CO 2 The mole fraction added was 92.0%.
Example 20
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 7, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium is 0.354bar, and N is 2 Has a vapor pressure of 6.646bar, N 2 The mole fraction added was 94.9%.
Example 21
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 8, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium was 0.775bar, N 2 Has a vapor pressure of 3.225bar, N 2 The mole fraction added was 80.5%.
Example 22
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment containsPreparation of the gas insulating Medium of example 8, operating Environment temperature of electric Power Equipment was-15 ℃ to 40 ℃, and the gas insulating Medium was mixed with CO 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium was 0.490bar, and CO was added 2 Has a vapor pressure of 6.510bar, CO 2 The molar fraction added was 93.0%.
Example 23
An electric power equipment containing binary mixed gas insulating medium, the electric power equipment contains the gas insulating medium of preparation example 8, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulating medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium is 0.299bar, and N is 2 Has a vapor pressure of 6.701bar, N 2 The mole fraction added was 95.7%.
Comparative preparation example 1
A gas insulation medium comprises saturated fluorine-containing olefin gas, wherein the fluorine-containing olefin gas is HFO-1336mzz (E), and the molecular structure of the HFO-1336mzz (E) is shown in figure 1.
Comparative preparation example 2
A gas insulation medium comprises saturated fluorine-containing alkane gas, wherein the saturated fluorine-containing alkane gas is R-134, and the molecular structure of the R-134 is shown in figure 2.
Comparative example 1
An electric power equipment containing gas insulation medium, the electric power equipment contains the gas insulation medium of comparative preparation example 1, the operating environment temperature of the electric power equipment is-5 ℃ to 40 ℃, and the gas insulation medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.4MPa, as shown in FIG. 4. At this time, the saturated vapor pressure of the gas insulating medium is 0.599bar, and N is 2 Has a vapor pressure of 3.401bar, N 2 The mole fraction added was 85.0%.
Comparative example 2
An electric power equipment containing gas insulation medium, the electric power equipment contains the gas insulation medium of comparative preparation example 1, the operating environment temperature of the electric power equipment is-15 ℃ to 40 ℃, and the gas insulation medium and CO are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 5. At this time, the saturated vapor pressure of the gas insulating medium is 0.376bar, and CO is present 2 Has a vapor pressure of 6.624bar, CO 2 The mole fraction added was 94.6%.
Comparative example 3
An electric power equipment containing gas insulation medium, the electric power equipment contains the gas insulation medium of comparative preparation example 1, the operating environment temperature of the electric power equipment is-25 ℃ to 40 ℃, and the gas insulation medium and N are mixed 2 Mixing was carried out so that the total gas pressure reached 0.7MPa, as shown in FIG. 6. At this time, the saturated vapor pressure of the gas insulating medium was 0.226bar, and N was 2 Has a vapor pressure of 6.774bar, N 2 The molar fraction added was 96.8%.
Performance test
1. The total saturated vapor pressure, the partial pressure of HFO-1336mzz (E) and the partial pressure of R-134 of the gas insulation media of production examples 1-8 and comparative production examples 1-2 were measured at ambient temperatures of-5 deg.C, -15 deg.C and-25 deg.C, respectively, and the results of the measurements are shown in FIGS. 3-6;
2. the insulation strengths of the gas insulation mediums of preparation examples 1-11 and comparative preparation examples 1-2 at ambient temperatures of-5 deg.C, -15 deg.C and-25 deg.C were measured, respectively, and the statistics and calculation were made for each preparation example or comparative preparation example with respect to SF 6 The times of the insulation strength of each preparation example or comparative preparation example relative to the pure HFO-1336mzz (E) are counted and calculated at the same time, and the detection results are shown in the following tables 1-3;
3. the critical breakdown electric field strengths of the gas insulating mediums of production examples 1 to 8 and comparative production examples 1 to 2 were measured, and the results of the measurements are shown in FIG. 7;
4. the GWP values of the gas insulating media of preparation examples 1 to 8 and comparative preparation examples 1 to 2 were measured, and the results are shown in FIG. 8.
TABLE 1 insulation Strength at-5 ℃ in comparative examples 1 to 11 and comparative preparation examples 1 to 2
TABLE 2 insulation Strength at-15 ℃ in comparative examples 1 to 11 and comparative preparation examples 1 to 2
TABLE 3 insulation Strength at-25 ℃ in comparative examples 1 to 11 and comparative preparation examples 1 to 2
As can be seen from the results of the tests of examples 1 to 8 and comparative preparation examples 1 to 2 in tables 1 to 3 and FIG. 8, HFO-1336mzz (E) was used as the main insulating medium, while mixing R-134 was used as the buffer medium. The synergistic effect of the mixed gas enables the insulation strength to be obviously enhanced, and the mixed gas can be used for replacing SF 6 The GWP value of the mixed gas insulating medium is maintained below 1100, and the mixed gas insulating medium is non-toxic and non-combustible, meets the requirement of environmental protection, and has excellent comprehensive performance.
Controlling the mole fraction of HFO-1336mzz (E) added to be in the range of 20% to 50% when the gas insulation medium having a temperature exceeding SF is under the temperature condition of-25 ℃ to 40 ℃ in ambient temperature 6 Dielectric Strength Performance and lower GWP values, the highest dielectric strength achieved at 30% addition level of HFO-1336mzz (E), about SF 6 The insulating strength is 2 times that of the insulating material, the insulating requirement of power equipment can be met, and the GWP value is low and can meet the environmental protection requirement.
In combination with the schemes of comparative example 1 and examples 3, 6, 9, 12, 15, 18 and 21, comparison was made under the temperature condition that the operating ambient temperature was-5 deg.CCompared with pure HFO-1336mzz (E), the gas insulating medium with the added R-134 with the mole fraction of 20-80 percent uses less N 2 The background gas filling amount was larger, and the results of the measurements in table 1 revealed that the insulation performance of examples 3, 6, 9, 12, 15, 18 and 21 was better as a whole.
Compared with the schemes of comparative example 2 and examples 7, 10, 13, 16, 19 and 22, under the temperature condition that the temperature of the operating environment is-15 ℃, the gas insulation medium with the addition of the molar fraction of 20-70% of R-134 has less dosage and CO compared with pure HFO-1336mzz (E) 2 The results of the measurements in Table 2 show that examples 7, 10, 13, 16, 19 and 22 have excellent insulation performance as a whole, while the amount of the filled background gas is large.
Compared with the schemes of comparative example 3 and examples 8, 11, 14, 17, 20 and 23, under the temperature condition of-25 ℃ of the operating environment temperature, the gas insulation medium with the addition of the molar fraction of 20-70% of R-134 is less than the dosage of pure HFO-1336mzz (E), and N is less 2 The results of the measurements in Table 3 show that examples 8, 11, 14, 17, 20 and 23 have better insulation performance as a whole, while the amount of the filled background gas is larger.
Since the liquefaction temperature of pure HFO-1336mzz (e) is high, the filling amount at a fixed operation temperature is limited, and it is difficult to improve the insulation performance. The filling amount of the HFO1336mzz (E) at the limit temperature is improved after the HFO-1336mzz (E) and the R-134 are mixed into a gas insulating medium and mixed with background gas to be filled into power equipment. Meanwhile, the insulation strength can be obviously improved on the premise of lower filling amount, the using amount of a gas insulation medium is reduced, the insulation performance is improved, and the method is economical and economical.
As can be seen from the results of examination of examples 1 to 8, comparative preparation examples 1 to 2 and FIGS. 3 to 6 in tables 1 to 3, when the gas-insulated medium is at ambient temperatures of-5 deg.C, -15 deg.C and-25 deg.C, respectively, the saturated vapor pressure of the gas-insulated medium tends to increase as the amount of R-134 added increases, but the vapor partial pressure of HFO-1336mzz (E) tends to increase first and then decrease as the amount of R-134 increases. Specifically, the partial pressure of HFO-1336mzz (E) steam is increased in the range of 20-40% of the amount of R-134 added, and the maximum is reached when the mole fraction of the amount of R-134 added is 30%, and the partial pressure of HFO-1336mzz (E) steam is increased by about 11-14%; because the application is limited by the high boiling point of HFO-1336mzz (E), the saturated partial pressure of HFO-1336mzz (E) in the gas insulation medium can be effectively improved and the boiling point can be reduced by controlling the addition amount mole fraction of R-134 to be 20-40%, and meanwhile, the mixed medium has excellent insulation strength and extremely low GWP value due to synergistic effect, so that the comprehensive performance of the gas insulation medium is improved and the application field is expanded.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (9)
1. A binary mixed gas insulation medium is characterized by comprising fluorine-containing olefin gas and saturated fluorine-containing alkane gas, wherein the fluorine-containing olefin gas is HFO-1336mzz (E), the mole fraction of the saturated fluorine-containing alkane gas is 20-70%, and the saturated fluorine-containing alkane gas is one of R-134, R-134a, R-125a and HFC-32.
2. The binary mixed gas insulating medium according to claim 1, wherein said saturated fluorine-containing alkane gas is R-134.
3. The binary mixed gas insulation medium according to any one of claims 1-2, wherein the molar fraction of the saturated fluorine-containing alkane gas is 20% to 50%.
4. The binary mixed gas insulation medium of claim 3, wherein the molar fraction of saturated fluorine-containing alkane gas in the gas insulation medium is 20% to 40%.
5. The binary mixed gas insulation medium of claim 3, wherein the molar fraction of saturated fluorine-containing alkane gas in said gas insulation medium is 30%.
6. Use of a binary mixed gas insulating medium according to any one of claims 1 to 5 in the field of electrical equipment.
7. An electric power equipment comprising a binary mixed gas insulating medium, characterized in that the gas insulating medium is a binary mixed gas insulating medium according to any one of claims 1 to 5.
8. An electrical apparatus comprising a binary mixed gas insulating medium according to claim 7, wherein said gas insulating medium is mixed with a background gas and added to the electrical apparatus, said background gas comprising CO 2 、N 2 And drying the air.
9. An electric power apparatus comprising a binary mixed gas insulating medium according to claim 7, characterized in that: the operating temperature of the power equipment is-25 ℃ to 40 ℃.
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