WO2021139070A1

WO2021139070A1 - Arc extinguishing and/or insulated electrical device

Info

Publication number: WO2021139070A1
Application number: PCT/CN2020/092544
Authority: WO
Inventors: 唐念; 李丽; 周永言
Original assignee: 广东电网有限责任公司电力科学研究院
Priority date: 2020-01-10
Filing date: 2020-05-27
Publication date: 2021-07-15
Also published as: CN111211515B; CN111211515A

Abstract

Disclosed is an arc extinguishing and/or insulated electrical device. In the arc extinguishing and/or insulated electrical device, trans-1,1,1,4,4,4-hexafluoro-2-butene or a mixed gas containing trans-1,1,1,4,4,4-hexafluoro-2-butene is used as a medium- and high-voltage arc extinguishing and/or insulating medium, having good electrical insulation and arc extinguishing properties, being able to improve the insulating capability, and replacing SF6 to be filled in an arc extinguishing and/or insulated electrical device, thereby reducing the impact of SF6 emission on the environment, such that the problem of SF6 emission can be solved; moreover, the temperature range for using the arc extinguishing and/or insulated electrical device can be extended.

Description

An arc extinguishing and/or insulated electrical equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on January 10, 2020, the application number is 202010028119.5, and the invention title is "a kind of arc extinguishing and/or insulated electrical equipment", the entire content of which is incorporated by reference In this application.

Technical field

The invention belongs to the technical field of electrical equipment, and in particular relates to an arc extinguishing and/or insulated electrical equipment.

Background technique

Gas insulating medium is widely used in various electrical equipment and is especially used in the insulation of gas insulated switchgear or its conductive parts. Among them, sulfur hexafluoride (SF ₆ ) gas is used as a gas insulating medium to extinguish arcs at medium and high voltages. /Insulated electrical equipment is the most widely used.

Sulfur hexafluoride (SF ₆ ) gas has excellent arc extinguishing performance and relatively high insulation strength. Under standard atmospheric pressure, its breakdown voltage is nearly three times that of air. At the same time, the gas presents properties such as chemical inertness, non-toxic, non-flammable, non-explosive and thermodynamically stable. Based on the above advantages, _{medium-voltage and high-voltage electrical equipment using SF 6} and its mixed gas as insulation and arc extinguishing medium dominate the power grid.

However, SF ₆ is a gas with a serious greenhouse effect. Its Global Warming Potential (GWP) is approximately _{23900 times that of CO 2} and its survival time in the atmosphere is approximately 3200 years. One of the six greenhouse gases whose emissions are restricted, and it is also the gas with the largest GWP among the six gases.

Therefore, finding an environment-friendly SF ₆ substitute gas as an insulating gas medium for use in electrical equipment has become an urgent technical problem to be solved by those skilled in the art.

In the research process of looking for insulating gas medium to replace SF ₆ , it is necessary to focus on the relative electric strength (Er, relative to SF ₆ ), greenhouse effect potential and liquefaction temperature (Tb) of the alternative gas, as well as its ozone depletion potential. Value (ODP), ecotoxicity, stability, thermal conductivity, arc extinguishing performance, properties of discharge decomposition products, etc.

The current research mainly focuses on the following three aspects: On the one hand, it is to replace SF ₆ with conventional gas, such as air, N ₂ and CO ₂ (for example, patent WO 2008/073790). Through research, it is found that although conventional gases have stable properties, low liquefaction temperature, and low greenhouse effect, conventional gases have relatively low electronegativity, their ability to adsorb electrons is much smaller than SF ₆ , and their insulation strength is less than 40% of _{SF 6.} Conventional gas as an insulating medium can replace SF ₆ in some medium and low voltage equipment, but it is generally necessary to increase the gas pressure in the equipment and increase the size of electrical equipment, which will increase the area of electrical equipment to a certain extent, and the economic cost will also be corresponding. Increase, affecting the widespread use of electrical equipment.

SF ₆ followed by adding other gases, and reduce the amount of emissions of the SF ₆ gas insulation performance in ensuring the premise, to reduce the impact on the environment, such as _{_{_{SF 6 / N 2, SF 6}}} / CO 2 and SF ₆ /CF ₄ and other mixed gases (for example, patent WO 2009/049144). However, this method cannot completely eliminate _{the use of SF 6} gas, and cannot fundamentally solve the greenhouse effect problem. After SF ₆ is mixed with other gases, its liquefaction temperature will be lowered, which can realize the application of SF ₆ mixed gas in alpine regions to a certain extent, which has certain significance in engineering. Due to the addition of other gases in SF ₆ , the arc extinguishing and insulation properties of the mixed gas are reduced, which limits its scope of application.

The last aspect is to find an insulating substitute gas or its mixed gas with strong electronegativity to completely replace the application of SF ₆ in gas insulated equipment. At present, these substitute gases mainly include:

1) PFC gases, such as cC ₄ F ₈ , C ₂ F ₆ , C ₃ F _8, etc., but the GWP of these gases is still very high, and at the same time, they are also affected by factors such as temperature and air pressure during use;

2) CF ₃ I gas. The GWP value of _{CF 3} _{I gas is equivalent to that of CO 2} gas, and its life in the atmosphere is only 1 to 2 d, and its insulation strength is better than that of SF ₆ gas, which has superior dielectric strength and GWP value. However, CF ₃ I gas is easy to decompose during the application process, and the decomposition products have an impact on arc extinguishing and insulation properties. At the same time, it is expensive. The average occupational exposure level is 3-4ppm. It is classified as a grade 3 carcinogen, reproductive toxic substance and The use of substances that induce mutations in organisms is prohibited on an industrial scale;

3) g ³ gas (mixed gas of heptafluoroisobutyronitrile gas C ₄ F ₇ N and CO ₂ ) and PFK gas (perfluoroketone gas C ₅ F ₁₀ O). Corresponding medium and high voltage electrical equipment has been developed and carried out In the demonstration application, heptafluoroisobutyronitrile has a certain risk of carcinogenesis and its own greenhouse effect GWP index is still high. The liquefaction temperature of perfluoropentanone is very high, the application environment is limited, and the insulation performance is difficult to meet the needs of high-voltage equipment. .

Summary of the invention

In view of this, the present invention provides an arc extinguishing and/or insulated electrical equipment. The gas medium of the arc extinguishing and/or insulated electrical equipment of the present invention is trans-1,1,1,4,4,4-hexafluoro -2-butene or mixed gas containing trans-1,1,1,4,4,4-hexafluoro-2-butene can replace SF ₆ as medium and high voltage arc extinguishing and/or insulating medium, Has good electrical insulation and arc extinguishing performance, low GWP.

The specific technical scheme of the present invention is as follows:

An arc extinguishing and/or insulated electrical equipment, wherein the arc extinguishing and/or insulated electrical equipment is a medium voltage device or a high voltage device;

The gas medium of the arc extinguishing and/or insulating electrical equipment is trans-1,1,1,4,4,4-hexafluoro-2-butene or containing the trans-1,1,1,4 ,4,4-hexafluoro-2-butene mixed gas;

The mixed gas also includes one or more of dry air, nitrogen, oxygen, carbon dioxide and rare gases;

If the electrical equipment is a medium pressure equipment, the pressure of the gas medium is 1.0 bar to 1.8 bar, and the minimum temperature of the gas medium is -30°C to 0°C;

If the electrical equipment is a high-voltage equipment, the pressure of the gas medium is 4.0 bar to 8.5 bar, and the minimum temperature of the gas medium is -20°C to 0°C.

In the present invention, the trans-1,1,1,4,4,4-hexafluoro-2-butene molecule contains six fluorine atoms, which are located at the two ends of the molecule and exist symmetrically at the same time, making it excellent Arc extinguishing performance and relatively high insulation strength, trans-1,1,1,4,4,4-hexafluoro-2-butene has low toxicity (acute inhalation toxicity LC50 (rat): >25400ppm, no acute Inhalation toxicity), non-explosive, ODP (The Ozone Depletion Potential, atmospheric ozone depletion potential) is 0, GWP is 18, with little or no impact on the environment, its liquefaction temperature is 7.5℃, and the saturated vapor pressure is high. At the same time, it has excellent arc extinguishing performance and relatively high insulation strength. Trans-1,1,1,4,4,4-hexafluoro-2-butene is composed of elements, compound structure and gas physical and chemical properties, etc. In terms of SF ₆ replacement gas, it has obvious advantages, with trans-1,1,1,4,4,4-hexafluoro-2-butene or trans-1,1,1,4,4 , 4-hexafluoro-2-butene mixed gas as medium and high voltage arc extinguishing and/or insulating medium, has good electrical insulation and arc extinguishing performance, can greatly improve the insulation capacity, and replace SF ₆ in the arc extinguishing and/or insulating medium. / Or filling in insulated electrical equipment, reducing the impact of SF ₆ emissions on the environment, can fundamentally solve the problem of SF ₆ emissions, and expand the application temperature range of arc extinguishing and/or insulated electrical equipment.

In the present invention, the GWP value of the mixed gas is lower than the GWP value of trans-1,1,1,4,4,4-hexafluoro-2-butene, and dry air, nitrogen, oxygen, and carbon dioxide are added to the mixed gas And/or rare gas, can make the gas medium can still maintain a gaseous state under the influence of pressure and temperature. In addition, dry air, nitrogen, oxygen, carbon dioxide and rare gases are non-toxic, non-explosive, ODP value is 0, GWP value is low, with little or no impact on the environment, and low liquefaction temperature.

In the present invention, when the electrical equipment is a medium-pressure equipment, the pressure of the gas medium is 1.0bar～1.8bar, and the minimum temperature of the gas medium is -30℃～0℃; the electrical equipment is a high-pressure equipment, and the pressure of the gas medium is 4.0bar～ 8.5bar, the lowest temperature of the gaseous medium is -20℃～0℃, the partial pressure of trans-1,1,1,4,4,4-hexafluoro-2-butene is less than or equal to the saturation at the lowest temperature Vapor pressure enables trans-1,1,1,4,4,4-hexafluoro-2-butene to always exist in electrical equipment in gaseous form regardless of the temperature of electrical equipment.

In the present invention, the direct current in the medium voltage equipment exceeds 1KV but not more than 75KV, the alternating current in the medium voltage equipment exceeds 1KV but not more than 52KV; the direct current in the high voltage equipment exceeds 75KV, and the alternating current in the high voltage equipment strictly exceeds 52KV.

Preferably, the mixed gas is trans-1,1,1,4,4,4-hexafluoro-2-butene and dry air.

Using dry air and trans-1,1,1,4,4,4-hexafluoro-2-butene to form a mixed gas has the following advantages:

1) Dry air and trans-1,1,1,4,4,4-hexafluoro-2-butene have a good synergistic effect and stronger insulation;

2) In unfavorable circumstances such as discharge or overheating, the use of dry air can inhibit the decomposition of trans-1,1,1,4,4,4-hexafluoro-2-butene into carbon powder, thereby ensuring The insulation capacity of the equipment and the safety of use;

3) For medium-pressure equipment, the use of dry air eliminates the need to vacuum the equipment or flush the replacement gas, which is more convenient and friendly to use.

In the present invention, dry air, nitrogen, oxygen, carbon dioxide and/or rare gas are filling gases.

In medium pressure equipment, use trans-1,1,1,4,4,4-hexafluoro-2-butene or trans-1,1,1,4,4,4-hexafluoro-2 -When the pressure of the mixed gas of butene is 1.2bar and the temperature is -30～0℃, the partial pressure of trans-1,1,1,4,4,4-hexafluoro-2-butene in the gaseous state is as follows Table 1 shows.

Table 1 Trans-1,1,1,4,4,4-hexafluoro-2-butene saturated vapor pressure in medium pressure equipment

In high-pressure equipment, use trans-1,1,1,4,4,4-hexafluoro-2-butene or containing trans-1,1,1,4,4,4-hexafluoro-2- When the pressure of the mixed gas of butene is 7.0bar and the temperature is -20～0℃, the partial pressure when trans-1,1,1,4,4,4-hexafluoro-2-butene is gaseous is shown in the table 2 shown.

Table 2 Trans-1,1,1,4,4,4-hexafluoro-2-butene saturated vapor pressure in high pressure equipment

In the present invention, the internal pressure of the gas medium in the arc extinguishing and/or insulating electrical equipment is affected by the electrical equipment, and trans-1,1,1,4,4,4-hexafluoro-2-butene is used in the electrical equipment It is completely or almost completely in the form of gas at the lowest temperature, and the filling gas is added to the electrical equipment to reach a given filling pressure. For example, under the condition of -30℃, the medium pressure equipment must be filled to 1.2bar (that is, 120KPa), then 0.17bar trans-1,1,1,4,4,4-hexafluoro-2- Butene is mixed with 1.03bar filling gas.

Since trans-1,1,1,4,4,4-hexafluoro-2-butene has better arc extinguishing performance and relatively higher insulation strength than filling gas, it can pass trans-1,1,1 ,4,4,4-hexafluoro-2-butene to optimize filling.

Preferably, the arc extinguishing and/or insulated electrical equipment is a medium voltage equipment;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 5%-60%.

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 20%-50%.

The pressure of the gas medium is 1.2 bar to 1.3 bar.

Preferably, the arc extinguishing and/or insulated electrical equipment is a high-voltage equipment;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 4%-18%.

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 6%-12%.

The pressure of the gas medium is 5.0 bar to 7.0 bar.

In the present invention, when the lowest application temperature is -30°C, trans-1,1,1,4,4,4-hexafluoro-2-butene exists in the mixed gas at a partial pressure of 0.17 bar, and does not Liquefaction occurs. When the lowest application temperature is 0°C, trans-1,1,1,4,4,4-hexafluoro-2-butene exists in the mixed gas at a partial pressure of 0.74bar without liquefaction. In medium and high pressure equipment, the partial pressure of trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas ranges from 0.17bar to 0.74bar.

Preferably, the arc extinguishing and/or insulated electrical equipment is a gas insulated transformer, a gas insulated combined electric appliance, a gas insulated circuit, a bus bar group or a power switch.

In the present invention, the gas-insulated transformer can be a measuring transformer or a power transformer; gas-insulated combined electrical appliances, gas-insulated lines, busbar sets or power switches can be used for power distribution or power transmission, and can be circuit breakers, switches, switches and fuses. Sets, earthing switches, separators and contacts.

Preferably, the arc extinguishing and/or insulated electrical equipment includes a bus bar, an instrument room, a cabinet, a gas density sensor, a three-position isolating switch, a three-position isolating switch operating mechanism, a control and protection unit, a circuit breaker, and a circuit breaker operating mechanism. Moving mechanism, voltage transformer, ZnO arrester, current transformer, cable terminal, pressure relief channel, upper gas-filled shell and lower gas-filled shell, the above-mentioned electrical components are connected to each other to form arc extinguishing and/or insulated electrical equipment;

The gas medium is sealed in the upper inflatable shell and the lower inflatable shell.

Preferably, the metal material in the arc extinguishing and/or insulated electrical equipment is selected from iron, silver, copper and/or aluminum;

The insulating material in the arc extinguishing and/or insulating electrical equipment is selected from epoxy resin, fluoroplastic, perfluoroethylene propylene copolymer and/or EPDM rubber;

The sealing material in the arc extinguishing and/or insulated electrical equipment is selected from nitrile rubber, fluorine rubber, EPDM, polyvinyl chloride and/or polyether ether ketone.

In summary, the present invention provides an arc extinguishing and/or insulated electrical device, the arc extinguishing and/or insulated electrical device is a medium voltage device or a high voltage device; the arc extinguishing and/or insulated electrical device is gas The medium is trans-1,1,1,4,4,4-hexafluoro-2-butene or a mixture containing trans-1,1,1,4,4,4-hexafluoro-2-butene Gas; the mixed gas includes one or more of dry air, nitrogen, oxygen, carbon dioxide, and rare gases; if the electrical equipment is a medium pressure equipment, the pressure of the gas medium is 1.0 bar to 1.8 bar, so The minimum temperature of the gaseous medium is -30°C to 0°C; if the electrical equipment is a high-pressure device, the pressure of the gaseous medium is 4.0bar to 8.5bar, and the minimum temperature of the gaseous medium is -20°C to 0°C .

In the arc extinguishing and/or insulated electrical equipment of the present invention, trans-1,1,1,4,4,4-hexafluoro-2-butene or trans-1,1,1,4,4, The mixed gas of 4-hexafluoro-2-butene is used as medium and high voltage arc extinguishing and/or insulating medium. It has good electrical insulation and arc extinguishing performance. It can greatly improve the insulation capacity and replace SF ₆ in arc extinguishing and/or Or filling in insulated electrical equipment, reducing the impact of SF ₆ emissions on the environment, can fundamentally solve the problem of SF ₆ emissions, and expand the temperature range of arc extinguishing and/or insulated electrical equipment. When the electrical equipment is medium-pressure equipment, the pressure of the gas medium is 1.0bar～1.8bar, and the minimum temperature of the gas medium is -30℃～0℃; the electrical equipment is high-pressure equipment, and the pressure of the gas medium is 4.0bar～8.5bar. The minimum temperature of the medium is -20℃～0℃, and the partial pressure of trans-1,1,1,4,4,4-hexafluoro-2-butene is less than or equal to the saturated vapor pressure at its lowest temperature. This makes the electrical equipment no matter what the temperature, trans-1,1,1,4,4,4-hexafluoro-2-butene will always exist in the electrical equipment in gaseous form.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art.

Figure 1 shows the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) in the trans-1 ,1,1,4,4,4-Hexafluoro-2-butene partial pressure is 0.6bar, and the inflation pressure is 7bar, the graph of the change of power frequency breakdown voltage with electrode distance;

Figure 2 shows the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) fixed trans-1 in Example 2 ,1,1,4,4,4-hexafluoro-2-butene partial pressure 0.7bar, power frequency breakdown voltage vs. inflation pressure curve;

Figure 3 shows the process of trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) and SF ₆ in Example 3. Frequency breakdown voltage test result graph;

Fig. 4 is a graph showing the variation of the power frequency breakdown voltage of the mixed gas with the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas in Example 4 of the present invention, Among them, HFO-1336mzz(E)+CO ₂ represents trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas, HFO-1336mzz(E)+Air represents reverse Formula -1,1,1,4,4,4-hexafluoro-2-butene/dry air mixed gas;

Figure 5 shows the power frequency breakdown _{of insulating gases SF 6} , g ³ /CO ₂ , C5-PFK/Air, HFO-1336mzz (E)/CO ₂ and HFO-1336mzz(Z)/CO ₂ in Example 5 of the present invention The graph of the voltage change with the inflation pressure, where SF ₆ stands for pure gas SF ₆ , g ³ /CO ₂ stands for heptafluoroisobutyronitrile C ₄ F ₇ N keeps the partial pressure of saturated vapor pressure at -25 ℃ unchanged, increases CO ₂ , C5-PFK/Air represents the mixed gas of perfluoroketone which keeps the saturated vapor pressure at 0℃ and increases the dry air. HFO-1336mzz(E)/CO ₂ represents trans-1,1, 1,4,4,4-hexafluoro-2-butene keeps the partial pressure of saturated vapor pressure at 0℃ unchanged and increases CO ₂ mixed gas; HFO-1336mzz(Z)/CO ₂ represents cis-1,1, 1,4,4,4-hexafluoro-2-butene keeps the partial pressure of the saturated vapor pressure at 0℃ unchanged and increases the CO ₂ mixed gas.

Detailed ways

The present invention provides an arc extinguishing and/or insulated electrical equipment. The gas medium of the arc extinguishing and/or insulated electrical equipment of the present invention is trans-1,1,1,4,4,4-hexafluoro-2-butane Ene or mixed gas containing trans-1,1,1,4,4,4-hexafluoro-2-butene, which can replace SF ₆ as medium and high voltage arc extinguishing and/or insulating medium, and has good electrical properties Insulation and arc extinguishing performance, low GWP.

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Example 1

This example tested the power frequency insulation characteristics of trans-1,1,1,4,4,4-hexafluoro-2-butene at different electrode distances. Please refer to Figure 1, which shows the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) in Example 1 Formula -1,1,1,4,4,4-hexafluoro-2-butene partial pressure is 0.6bar, and the inflation pressure is 7bar, the graph of the power frequency breakdown voltage with the electrode distance. Figure 1 shows that with the increase of the electrode distance, _{the power frequency breakdown voltage of the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO 2} mixed gas increases approximately linearly, and the electrode distance When it is 1mm, the power frequency breakdown voltage is 51kV, when the electrode distance rises to 5mm, the power frequency breakdown voltage is 140kV, and the rate of rise is 26.25kV/mm. The results show that under a uniform electric field, the _{power frequency insulation strength of the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO 2} mixed gas increases linearly with the increase of the electrode distance , The ascent rate is fast.

Example 2

In this example, the power frequency insulation characteristics of trans-1,1,1,4,4,4-hexafluoro-2-butene under different pressures were tested. Please refer to Figure 2, which shows the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) fixed reaction in Example 2 Formula -1,1,1,4,4,4-hexafluoro-2-butene partial pressure 0.7bar, power frequency breakdown voltage vs. inflation pressure. Figure 2 shows that as the inflation pressure increases, the power frequency breakdown voltage of the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO _{2 mixture increases approximately linearly.} At 3bar, the power frequency breakdown voltage is 92.3kV, when the air pressure rises to 5bar, the power frequency breakdown voltage is 124.5kV, and the rate of rise is 16.1kV/bar. The results show that under a uniform electric field, the _{power frequency insulation strength of the trans-1,1,1,4,4,4-hexafluoro-2-butene/CO 2} mixture gas increases linearly with the increase of the charging pressure , The ascent rate is fast.

Example 3

In this example, a power frequency breakdown voltage test of trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas and SF ₆ was carried out. The results are shown in Figure 3 for implementation The power frequency breakdown voltage of trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas (HFO-1336mzz(E)/CO ₂ ) and SF _{6 in example 3} The test result graph shows that the partial pressure of trans-1,1,1,4,4,4-hexafluoro-2-butene is 0.6bar, and the power frequency breakdown voltage when the inflation pressure is 1.2bar is 52.7kV , _{Which is equivalent to the power frequency breakdown voltage of SF 6} under this inflation pressure, indicating that trans-1,1,1,4,4,4-hexafluoro-2-butene has good insulation properties.

Example 4

In this example, trans-1,1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas and trans-1,1,1,4,4,4-hexafluoro The power frequency insulation characteristics of the -2-butene/dry air mixed gas under the plate electrode, the electrode distance is 5.0mm, and the pressure is 1.2bar. The result is shown in Figure 4, which shows the power frequency breakdown voltage of the mixed gas in Example 4 of the present invention. Trans-1,1,1,4,4,4-hexafluoro-2-butene is a graph showing the change of mole percentage in the mixed gas, where HFO-1336mzz(E)+CO ₂ represents trans-1, 1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas, HFO-1336mzz(E)+Air represents trans-1,1,1,4,4,4-hexafluoro- 2-Butene/dry air mixed gas. The results show that the power frequency breakdown voltage of the mixed gas increases linearly with the increase of the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene. When the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene is trans-1,1,1,4,4,4-hexafluoro-2-butene/ When the CO ₂ mixed gas is 18.89%, the power frequency breakdown voltage is 30.72kV; when the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene is trans-1, When the 1,1,4,4,4-hexafluoro-2-butene/CO ₂ mixed gas is 50%, the power frequency breakdown voltage is 48.5kV; when other conditions remain unchanged, the trans-1,1,1 For every 1% increase in the mole percentage of 4,4,4-hexafluoro-2-butene, the power frequency breakdown voltage increases by 0.57kV. When the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene is trans-1,1,1,4,4,4-hexafluoro-2-butene/ When the dry air mixed gas is 18.89%, the power frequency breakdown voltage is 38.7kV; when the mole percentage of trans-1,1,1,4,4,4-hexafluoro-2-butene is trans-1, When the 1,1,4,4,4-hexafluoro-2-butene/air mixture is 50%, the power frequency breakdown voltage is 59.6kV; when other conditions remain unchanged, the trans-1,1,1, When the mole percentage of 4,4,4-hexafluoro-2-butene increases by 1%, the power frequency breakdown voltage increases by 0.67kV. The results show that the insulation performance of trans-1,1,1,4,4,4-hexafluoro-2-butene/dry air mixed gas is better than trans-1,1,1,4,4,4 -Hexafluoro-2-butene/CO ₂ mixed gas.

Example 5

In this embodiment, the power frequency breakdown of _{the insulating gases SF 6} , g ³ /CO ₂ , C5-PFK/Air, HFO-1336mzz(E)/CO ₂ and HFO-1336mzz(Z)/CO ₂ was detected in the plate electrode. When the voltage changes with the inflation pressure, the electrode distance is 5mm. Please refer to Figure 5 for the results, which are the insulating gases SF ₆ , g ³ /CO ₂ , C5-PFK/Air, HFO-1336mzz(E)/CO ₂ and HFO-1336mzz(Z)/CO ₂ in Example 5 of the present invention The graph of power frequency breakdown voltage versus charging pressure, where SF ₆ represents pure gas SF ₆ , g ³ /CO ₂ represents the partial pressure of heptafluoroisobutyronitrile C ₄ F ₇ N maintained at -25°C saturated vapor pressure The mixed gas without increasing CO ₂ , C5-PFK/Air represents the partial pressure of perfluoroketone maintained at 0℃ saturated vapor pressure, the mixed gas with increasing dry air unchanged, HFO-1336mzz(E)/CO ₂ represents the trans- 1,1,1,4,4,4-hexafluoro-2-butene keeps the partial pressure of saturated vapor pressure at 0℃ unchanged and increases CO ₂ mixed gas; HFO-1336mzz(Z)/CO ₂ represents cis- 1,1,1,4,4,4-hexafluoro-2-butene keeps the partial pressure of the saturated vapor pressure at 0℃ unchanged and increases the CO ₂ mixture. The results show that the power frequency breakdown voltage of HFO-1336mzz(E)/CO ₂ and g ³ /CO ₂ under the same inflation pressure is close, far better than C5-PFK/Air and HFO-1336mzz(Z)/CO ₂ .

The description of the above embodiments is only used to help understand the method and the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

An arc extinguishing and/or insulated electrical device, characterized in that the arc extinguishing and/or insulated electrical device is a medium voltage device or a high voltage device;

The gas medium of the arc extinguishing and/or insulating electrical equipment is trans-1,1,1,4,4,4-hexafluoro-2-butene or containing the trans-1,1,1,4 ,4,4-hexafluoro-2-butene mixed gas;

The mixed gas also includes one or more of dry air, nitrogen, oxygen, carbon dioxide and rare gases;

If the electrical equipment is a medium pressure equipment, the pressure of the gas medium is 1.0 bar to 1.8 bar, and the minimum temperature of the gas medium is -30°C to 0°C;

If the electrical equipment is a high-voltage equipment, the pressure of the gas medium is 4.0 bar to 8.5 bar, and the minimum temperature of the gas medium is -20°C to 0°C.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the mixed gas is trans-1,1,1,4,4,4-hexafluoro-2-butene and dry air .
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment is a medium voltage device;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 5%-60%.
The arc extinguishing and/or insulated electrical equipment according to claim 3, wherein the arc extinguishing and/or insulated electrical equipment is a medium voltage device;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 20%-50%.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment is a medium voltage device;

The pressure of the gas medium is 1.2 bar to 1.3 bar.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment is a high voltage device;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 4%-18%.
The arc extinguishing and/or insulated electrical equipment according to claim 6, wherein the arc extinguishing and/or insulated electrical equipment is a high voltage device;

The mole percentage of the trans-1,1,1,4,4,4-hexafluoro-2-butene in the mixed gas is 6%-12%.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment is a high voltage device;

The pressure of the gas medium is 5.0 bar to 7.0 bar.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment is a gas insulated transformer, a gas insulated combined electrical appliance, a gas insulated circuit, a bus bar group, or a power switch.
The arc extinguishing and/or insulated electrical equipment according to claim 1, wherein the arc extinguishing and/or insulated electrical equipment includes a bus bar, an instrument room, a cabinet, a gas density sensor, a three-position isolating switch, and a three-position Isolating switch operating mechanism, control and protection unit, circuit breaker, circuit breaker operating mechanism, voltage transformer, ZnO arrester, current transformer, cable terminal, pressure relief channel, upper gas-filled shell and lower gas-filled shell;

The gas medium is sealed in the upper inflatable shell and the lower inflatable shell.
The arc extinguishing and/or insulated electrical device according to claim 10, wherein the metal material in the arc extinguishing and/or insulated electrical device is selected from iron, silver, copper and/or aluminum;

The insulating material in the arc extinguishing and/or insulating electrical equipment is selected from epoxy resin, fluoroplastic, perfluoroethylene propylene copolymer and/or EPDM rubber;

The sealing material in the arc extinguishing and/or insulated electrical equipment is selected from nitrile rubber, fluorine rubber, EPDM, polyvinyl chloride and/or polyether ether ketone.