CN109493995A - Mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas - Google Patents
Mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas Download PDFInfo
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- CN109493995A CN109493995A CN201811115409.2A CN201811115409A CN109493995A CN 109493995 A CN109493995 A CN 109493995A CN 201811115409 A CN201811115409 A CN 201811115409A CN 109493995 A CN109493995 A CN 109493995A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/055—Features relating to the gas
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- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Organic Insulating Materials (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
A kind of mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas, including shell, mixed gas, electric component are filled in the shell, the outer side covering of the shell has solid dielectric layer, the mixed gas includes seven fluorine isobutyronitriles, difluoromethane, rare gas, and the rare gas is carbon dioxide, nitrogen, oxygen, air and its mixture.The beneficial effect is that: insulating capacity is suitable with SF6 equipment, and will not significantly increase equipment size and pressure requirement；Provision for sealing is to environment and human body nonhazardous.
Description
Technical field
The present invention relates to medium-pressure or high pressure apparatus fields, especially a kind of to mix filled with seven fluorine isobutyronitriles and difluoromethane
The mesohigh device housings of gas.
Background technique
In electric insulation apparatus field, gas-insulated, which has had, to be more and more widely used, including gas-insulated envelope
Combined electrical apparatus (GIS), gas insulation switch cabinet (c-GIS) are closed, and gas insulation electric power line (GIL) more popular in recent years
Deng all playing an important role in respective field.This is because gas-insulated has only relative to other insulation technologies
Special advantage.Firstly, air insulating device is light-weight, and it is small in size, more transport installation and space cost can be saved；Its
It is secondary, influenced by the characteristic of gas medium itself, air insulating device in normal conditions of use, hardly aged deterioration, and
With self- recoverage characteristic, therefore maintenance period and the service life of equipment can be greatly prolonged.In addition, gas insulation technology also has
Have that technical maturity is simple, use condition by the external world is influenced the high advantage of small, non-ignitable not quick-fried safety coefficient, this is all doomed gas-insulated
Equipment has very wide application range, and particularly suitable for urban core dense population areas, power plant, electrified iron
Curb line, industrial and mineral metallurgy operation area and other places to space, safety and maintenance requirement harshness.
Sulfur hexafluoride (SF6) is generally used as gas-insulated medium in air insulating device.SF6 has fabulous electricity
Gas insulation performance can satisfy the insulating requirements in equipment.SF6 is nontoxic, incombustible, ensure that the safety of air insulating device
Property, while SF6 chemical property is stablized, can be mutually compatible with most of materials, in equipment running process it is less occur decomposing or
It is rotten, it ensure that the stability of equipment operation.SF6 has become a kind of important industrial gasses at present, and domestic SF6 annual output is already
More than 5000 tons, global annual output is wherein applied to electrical equipment also at 20000 tons or more more than 80%.With
The continuous growth of Electricity Demand, the expansion of power industry scale, for insulating gas demand also by sustainable growth.
Although the characteristic of SF6 can satisfy the needs of electric insulation equipment, its influence for environment and harm also exist
It is gradually concerned by people in recent years.SF6 is a kind of gas with stronger greenhouse effects, can be caused to amblent air temperature seriously
Harm, the latent value (Global Warming Potential, GWP) of greenhouse effects be about 23900 times of CO2, which means that
Under the conditions of being calculating cycle with 100 years, the SF6 of per unit discharge amount to influence caused by environment will considerably beyond CO2,
And as nowadays for the limitation of carbon emission amount being increasingly stringenter, the discharge amount of SF6 also will be accordingly with high weight quilt
It calculates wherein.More seriously, it since SF6 has highly stable chemical property, is difficult to after diffusing in external environment
It is degraded, there are the times to be 3200, and thus generated environment influence also will constantly be accumulated with greenhouse effects.
The influence of climate variation had carried out more and more cooperations in recent years in the world, to reduce greenhouse effect gas
The discharge of body maintains the sustainable development of environment and resource to inhibit Global climate change.It is signed in kyoto, Japan in 1997
" the United Nations Framework Convention on Climate Change Kyoto Protocol " in, SF6 has clearly been defined in 6 class greenhouse gases and has worked as
In, and require developed country to freeze and reduce greenhouse gas emission total amount.With the signature of " Paris agreement ", China was in recent years
It goes into overdrive to carry out the work for reducing carbon emission amount, it means that SF6, will be by increasing in the use of industrial circle
Limitation and pressure.For this purpose, the gas-insulated scheme that research is new, substitutes SF6, just becomes an extremely urgent job.
Since the 1980s, scholars just have begun working on the substitution gas of SF6, it is intended to which it is suitable to find
The usage amount of SF6 is reduced or avoided in solution, the greenhouse effects problem caused by reducing because of insulating gas.And new gas
Insulation Scheme, needs to meet that dielectric strength is higher, physicochemical properties are stable, has good material compatibility, nontoxic or micro-
Poison, condensing temperature be low and the conditions such as environmentally friendly, to realize the substitution for SF6.Current research direction substantially may be used
It is divided into 3 classifications, including SF6 mixed gas, high-pressure buffer gas and novel environment-friendly gas.
First kind scheme is to replace pure SF6 using SF6 mixed gas.This kind of scheme is by buffer gas, such as air, nitrogen
(N2), carbon dioxide (CO2) etc., and a certain proportion of SF6 gas mixing, using mixed gas as exhausted in air insulating device
Edge medium, to reduce the dosage of SF6 gas.And Mixed gas insulation intensity then contains the ratio of SF6 with mixed gas, delays
It is related to rush gaseous species, many scholars have also carried out more detailed research to this kind of scheme in recent years.According to existing research
The mixed gas of achievement, SF6 and N2, SF6 and air under equal conditions shows higher dielectric strength, when the mixing of SF6
When ratio is 50%, the dielectric strength under uniform electric field of mixed gas can achieve the 85% of pure SF6, and the two embodies very
Good positive coopertive effect, while cost is relatively low, has application feasibility.The some electrical equipment manufacturing enterprises in Europe, which have begun, tastes
Examination uses SF6 mixed gas as gas-insulated medium, using in switching equipment.This kind of scheme is that one kind can be reduced directly
On the one hand the scheme of SF6 dosage reduces the synthesis GWP of mixed gas；On the other hand, since SF6 gas usage is reduced, mixing
Cost, the condensing temperature of gas can also reduce, so that mixed gas can be with the gas under further satisfaction hyperbar or low temperature environment
Body insulation application demand.But at the same time, this kind of scheme not can avoid in long period still using SF6 as primary insulation medium
Using and relying on for SF6 can only slow down influence of the SF6 for Environment-Greenhouse effect, simultaneously because Mixed gas insulation is strong
Degree reduces, and needs to improve the blowing pressure of equipment, or be designed improvement to equipment, can also cause additional in terms of industrial production
Cost, therefore it is as long-term solution, does not obtain significantly approving and promoting.
Second class scheme is using hyperbar buffer gas, if compressed air, compression N2 or compression CO2 are as environment-friendly type
Gas-insulated medium, by the dielectric strength for the mode lift gas for improving gas pressure.Such gas is hardly to environment
Any negative effect is caused, only CO2 has extremely low GWP value, and gas is mostly inartificial gas, and cost is very low.But it is limited to
The attribute of gas itself, their dielectric strength only has 30% or so of SF6 gas under equal conditions, and arc extinguishing ability is weaker.
To be applied in air insulating device, need high the blowing pressure can proximity device insulating requirements, this will
Greatly test is generated to the strength of materials, the manufacturing process of equipment, it is necessary to greatly improve device structure intensity and air-tightness, and right
Existing high voltage installation internal electrode makes a change, such scheme comes extra band using problem and cost problem.On the other hand,
Buffer gas dielectric strength is improved with the increase of air pressure, but when air pressure increase to a certain extent after, the dielectric strength of gas will
It can tend to be saturated, will not continue to improve.Therefore, only part medium/low-voltage equipment is exhausted using air insulation or N2 both at home and abroad at present
Edge, such solution are dfficult to apply to high voltage installation.
Third class is to find new environment-friendly type insulated gas, has similar insulation characterisitic and other physicochemical properties with SF6,
To realize the substitution for SF6.SF6 belongs to inorganic fluoriding gas, and molecular structure is positive octahedral structure, peripheral 6 fluorine
Atom (F) surrounds the sulphur atom (S) at center.Since fluorine element belongs to halogen, atom peripheral electron layer is accounted for by 7 electronics
According to lacking 1 and electronically form rock-steady structure, therefore there is extremely strong absorptions electronics to be inclined to.And in the molecule of SF6, F atom
With S atom by way of shared electron, relatively stable covalent chemical bond is formd, but F atom still has certain absorption electricity
The tendency of son, and entire molecule is shown as the tendency of electron adsorption, therefore there is preferable insulation characterisitic.And it is this by gas
Body Macro-Elements constitute and the gas distinguishing that embodies, although the dielectric strength of gas can not be indicated accurately, or even exist anti-
Example, but be also studied personnel and paid attention to, the research emphasis for substituting gas is concentrated on halogenation gas.1997 in state, the U.S.
A variety of potential substitution gas are described in the insulation and arc quenching characteristic research report about SF6 substitution gas that the Bureau of Standards, family writes
Body, and part fluoro organic gas has been classified as to the research object of emphasis, each gas is under direct current uniform electric field compared with SF6
Relative breakdown voltage as shown in table 1-1.Report the result shows that, most of fluorinated gas has preferable suction to free electron really
Attached effect, there are relationships for this addition with fluorine element, but and not all fluoro organic gas all there is insulation performance well,
Only judge that gas-insulated characteristic is not comprehensive and accurate with the element for constituting gas, it is also necessary to carry out for the characteristic of gas with various
Concrete analysis.Since wherein c-C4F8 gas various aspects physicochemical property is closer to SF6, and cost is relatively low, GWP value also below
SF6, therefore report that c-C4F8 also especially set out and its mixed gas can be listed in long-term research object, the gas is in recent years
Also extensive concern and the research of researcher are received.
Other than c-C4F8 is by more concern, contain the organic gas of halogenation of fluorine element (F) and iodine (I) in recent years
Body CF3I, also because of extremely low GWP value, and preferable attention of the insulation characterisitic by researcher.At the same time, A Ersi
What logical company and Minnesota Mining and Manufacturing Company put out jointly, with C4F7N, i.e. the fluoro nitrile gas of trade name Novec 4710 be mainly at
What the g3 electric insulation mixed gas divided and ABB AB released, be with fluoro ketone compound, such as C5F10O and C6F12O
The electric insulation mixed gas mainly become all has reapective features.
Relative breakdown voltage of the part the table 1-1 fluoro organic gas under direct current uniform electric field
Table.1-1 Relative DC breakdown voltages of some fluorination gases
French Alstom (ALSTOM) company and Minnesota Mining and Manufacturing Company also once develop jointly the substitution gas for being directed to SF6,
It has selected to be also used as refrigerant replacement material, the gas of trade name Novec 4710 in numerous organic fluorinated gas
Body contains 4 C atoms, the organic compound of 7 F atoms, chemical formula C4F7N, the gas is in fluorinated hydrocarbon organic gas
On the basis of, a fluorine atom is replaced with cyano group (- C ≡ N), becomes fluoro nitrile gas, this contains carbon nitrogen
The cyano group of three keys has unique chemical bonding structure, so that C4F7N gas has good insulation performance, can achieve
2 times or so gas chemistries of SF6 be similar to fluoro organic gas, chemical characteristic is relatively stable, can and electrical equipment
In other materials realize good compatibility.C4F7N gas relative molecular mass is 195.0, equally has very high liquefaction
Temperature, condensing temperature are -4.7 DEG C, and SF6 can not be substituted in the form of pure gas, is needed lower with other condensing temperatures
Gas and buffer gas composition mixed gas use.
Summary of the invention
The purpose of the present invention is to solve the above problems, devise a kind of mixed filled with seven fluorine isobutyronitriles and difluoromethane
Close the mesohigh device housings of gas.Specific design scheme are as follows:
A kind of mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas, including shell, it is described
Mixed gas, electric component are filled in shell, the outer side covering of the shell has solid dielectric layer, and the mixed gas includes
Seven fluorine isobutyronitriles, difluoromethane, rare gas, the rare gas are carbon dioxide, nitrogen, oxygen, air and its mixture.
The seven fluorine isobutyronitrile selects seven fluorine different in the minimum saturated vapor pressure presented at use temperature of the equipment
Partial pressure in the apparatus is presented in butyronitrile, and under the filling temp of the equipment, seven fluorine isobutyronitriles are presented in the apparatus
Partial pressure in seven fluorine isobutyronitriles the minimum saturated vapor pressure presented at use temperature of the equipment 95% to 100% it
Between, the minimum temperature is -50 DEG C -0 DEG C.
The seven fluorine isobutyronitrile, difluoromethane, rare gas molar percentage be respectively seven fluorine isobutyronitrile 1mol% extremely
20mol%, difluoromethane 1mol% to 40mol%, rare gas 40mol% to 98mol%.
The thickness of the solid dielectric layer is the function of electric field utilization rate factor n, and the electric field utilization rate factor n is defined as
Average field intensity (U/d) is divided by maximum field intensity Emax(n)=U/ (Emax* d) resulting ratio,
When utilization rate factor is between 0.2 to 0.4, the solid dielectric layer is that thickness is greater than 1mm and is less than 10mm
Thick-layer,
When utilization rate factor is greater than 0.5, when especially greater than 0.6, the solid dielectric layer is that thickness is less than 1mm, needle
The relative dielectric constant for preparing the selected material of the thick solid dielectric layer is between 2-6.
The electric component includes gas insulation metal seal combined electrical apparatus (GIS), gas insulation switch cabinet (c-GIS),
Gas-insulated transmission line (GIL), gas-insulated transformer (GIT).Gas-insulated is by including seven fluorine isobutyronitriles and difluoromethane
Admixture of gas realize.
Medium pressure refer to greater than 1000 volts and the alternating current voltage no more than 52000 volts or be greater than 1500 volts without
DC voltage more than 75000 volts, the high pressure refer to alternating current voltage strictly larger than 52000 volts and strictly larger than
75000 volts of DC voltage.
The chemical formula of seven fluorine isobutyronitriles is that this compound of C3F7CN shows following characteristic: at 101,300 pas (hPa)
Boiling point is -4.7 DEG C, and (boiling point is according to ASTM D1120-94 " engine coolant boiling point standard method of test；Molal weight is
195g.mol-1；GWP is 2210；Ozone depletion potential is 0.
(the opposite gas SF6 to be substituted does normalized to the opposite dielectric strength values of seven fluorine isobutyronitriles, while also providing
As a comparison, two diameters of the dielectric strength under atmospheric pressure and DC voltage are 25mm and are spaced 1mm's the value of N2
It is measured between steel electrode.
| SF6 | N2 | C3F7CN |
| 1.0 | 0.35-0.4 | 2.6 |
Chemical formula is CH2F2The characteristic that difluoromethane is presented are as follows:
Boiling point is -51.7 DEG C under 101,300 pas；
Molal weight is 52g.mol-1；
GWP is 550；
(iv) ozone depletion potential is 0.
Chemical formula is CH2F2Difluoromethane opposite dielectric strength values, ibid, are as follows:
| SF6 | CH2F2 |
| 1.0 | 0.3-0.4 |
Therefore, the GWP that above-mentioned gas shows is much smaller than the GWP of SF6, has electrical insulation capability and arc suppression, can
It is mixed with diluent gas, is suitable for replacing SF6 to press as in and/or the electrical isolation in high-tension apparatus and/or arc suppression gas.
Also (GWP is relative to SF for very little for gaseous state insulation effect on environment provided by the invention6For it is lower), and with equipment
Minimum compatible using temperature, owned dielectric, extinguishing arc and heat dissipation characteristics are all more slow than such as carbon dioxide, air or nitrogen
Qi of chong channel ascending adversely body is good.
The buffer gas meets the gas of following four standard:
Low boiling point, normal atmosphere pressure are lower than -40 DEG C；Dielectric strength is greater than or equal to CO under identical measuring condition2To people
Body and environment influence smaller, low toxicity or nonhazardous；GWP, ODP of the GWP lower than seven fluorine isobutyronitriles and the mixture of difluoromethane
It is 0；The electric component includes gas insulation metal seal combined electrical apparatus (GIS), gas insulation switch cabinet (c-GIS), gas
Insulated power route (GIL), gas-insulated transformer (GIT).
What what above-mentioned technical proposal through the invention obtained constituted with seven fluorine isobutyronitriles and difluoromethane and buffer gas
The equipment of mixed gas, the beneficial effect is that:
Insulating capacity is suitable with SF6 equipment, and will not significantly increase equipment size and pressure requirement；
Provision for sealing is to environment and human body nonhazardous.
Specific embodiment
The present invention is based on a kind of specific admixture of gas is used, the admixture of gas includes that seven fluorine as defined above is different
Butyronitrile and difluoromethane are mixed with dispensable buffer gas, with low environmental impact and improved breakdown characteristics.
The equipment it is entire using temperature in the range of, seven fluorine isobutyronitriles and difluoromethane in a device all completely or
Almost it is rendered as gaseous state.The problem of for condensing temperature, according to the Dalton's law (of partial pressures) under ideal gas behavior, mixing
Total gas pressure is equal to the sum of the independent pressure of every kind of gas component.A kind of specific gas partial pressure shared in mixed gas
Ratio is equal under the conditions of same temperature, and the pressure of gas when it is individually full of same volume container is represented by following formula:
P=∑ Pi (1-2)
P represents the total gas pressure of mixed gas, P in formulaiRepresent the partial pressure of each gas component.Due in perfect gas, equality of temperature
Under degree and air pressure conditions, the gas of the amount of same substance all has identical volume, such as the standard molar volume of gas, any
For one mole of (mol) gas under 0 DEG C and a standard atmosphere condition, volume is 22.4L, under same pressure and temperature, gas
Body total volume is volume the sum of of each gas under the conditions of same, is not mixed and is changed by multiple gases, therefore, it is considered that mixing
The pressure that every kind of gas is born in gas can be equivalent to mixed gas gross pressure and be divided by the mixed proportion of every kind of gas
Match.If withBe denoted as every kind of gas shared the mass ratio of the material example in mixed gas, i.e., the content of the gas in mixed gas, then
Gas total gas pressure P can also be usedIt indicates are as follows:
The partial pressure Pi of similar each gas may also indicate that are as follows:
The saturated vapor pressure of gas can change with temperature and the difference of air pressure, for specific gas in different air pressures and
Saturated vapor pressure under the conditions of temperature can pass through gaseous state parameter and van der Waals equation (Van Der Waals
Equation it) determines [89], state equation such as formula 1-5:
Wherein P is air pressure, and n is the amount of gaseous matter, and V is volume, and R is universal gas constant, and T is temperature, and a and b are
Van der Waals constant related with gas critical air pressure and critical-temperature.When gas is for liquefied critical state, gas
The relationship of pressure P and temperature T still meets this equation, it can be seen that for specific gas, when air pressure is lower, and liquefaction
Temperature also can be lower, it means that for mixed gas, when the mixed proportion of a certain gas component reduces, and air pressure Pi
Also can with the variation of its ratio linear change, and its condensing temperature is also by according to the relevant parameter of the equation of gas state, therewith
It reduces.
It for mixed gas, its advantage lies in being able to arrange in pairs or groups by reasonable component ratio, by reducing gas point
The condensing temperature for pressing and reducing gas reduces the cost of mixed gas by reducing gas usage, evades SI semi-insulation gas
The shortcomings that.But meanwhile mixed gas also has a disadvantage of oneself in practical applications, the mixed proportion of insulating gas reduces, absolutely
Edge intensity will decrease, and reduced amplitude is not linear with the variation of gas content, but with gaseous species,
The factors such as gas content proportionate relationship, gas atmosphere, current field condition are related.
The dielectric strength of mixed gas is not only influenced by each component itself insulation characterisitic, mutual also between each component
Act on related, therefore its characteristic shows different variation tendency.And variation tendency among these can be divided into three classes, one
It is that the variation of dielectric strength and the mixed proportion of insulating gas change linearly relationship substantially, in gas breakdown voltage because gas is mixed
Its curve levels off to straight line in the image of composition and division in a proportion example variation, this indicates the insulating gas in mixed gas and for by it
The influence of his gas component, the dielectric strength of mixed gas can according to the dielectric strength of each clean gas and its in gaseous mixture
Proportion in body and be calculated.This is theoretical state, and after most of gas component mixing, dielectric strength is not in
Existing linear change.Second of variation tendency is the mixed proportion reduction of positive coopertive effect and insulating gas principal component, insulating gas
The reduction amplitude of dielectric strength is less than the reduction amplitude of gas content, that is, reduces the content of gas, but dielectric strength does not drop
It is low too many, it means that positive coopertive effect to be shown between the component of mixed gas, in gas breakdown voltage because of gas mixing ratio
The arch that Open Side Down is often shown as in the image of variation.This gas component there are positive coopertive effect is to be most suitable for being applied to
Condensing temperature, the gas cost of insulating gas can be significantly reduced in the mixed component of electric insulation equipment, while will not be to gas
The insulation performance of body causes extremely significantly to decline.The third variation tendency is negative coopertive effect, in the mixed gas of part
Referred to as Penning effect, this effect refers to two or more gas is mixed after, breakdown voltage be lower than respective gas
The breakdown voltage of body, so that gas is easier breakdown formation electric discharge, in gas breakdown voltage because gas mixing ratio changes
Image in curve be an opening upwards arch.The origin of Penning effect, and most prominent example are mercury vapour (Hg)
With the application of the mixed gas of argon gas (Ar) in neon light tube.Since argon gas is excited during discharge, can transit to
Metastable state, and the metastable state excitation energy of argon gas is slightly above the ionization energy of mercury vapour, therefore argon gas is equivalent to the catalysis of mercury vapour
Agent, when being collided by the metastable state argon gas and mercury vapor molecules excited, the metastable state excitation of argon gas can be transferred to mercury vapour
In molecule, thus by using accumulation energy induce mercury vapour ionize so that mixed gas be integrally provided be easier to it is breakdown
With the characteristic of ionization, macro manifestations are it with lower breakdown voltage.This effect can be in plasma correlation technology
Using, it is capable of the breakdown of easier realization plasma, and form stable discharge process, it is proper with gas isolated demand
Well on the contrary, therefore the breakdown characteristics variation tendency of this kind of mixed gas is not appropriate for applying in air insulating device field.Penning
Effect has very strict limitation for the type of gas, the mixed proportion of gas, it needs the microscopic characteristics of two kinds of gas
And between different conditions energy variation have extremely accurate relationship, the component of one of mixed gas excitation energy with higher,
Higher than the ionization energy of other components, and the excitation state odds is larger, and resonant intensity is sufficiently high, can be with other gas
The molecule of body has enough action time.Since in terms of microcosmic angle, Penning effect is multiple gases interaction of molecules
As a result, therefore mix insulation gas carry out component selection when, the analysis based on the microcosmic energy of each component gas molecule and into
The reasonable collocation of row and combination, the generation for avoiding excitation from promoting ionization process just seem particularly significant.
Following table two give seven fluorine isobutyronitriles 0 DEG C to -40 DEG C at a temperature of saturated vapor pressure and corresponding to rising to 20
DEG C these saturated vapor pressures pressure
| Temperature | PVSi-C3F7CN(hPa) | Pi-C3F7CN(hPa) |
| 0℃ | 1177 | 1264 |
| -5℃ | 968 | 1058 |
| -10℃ | 788 | 877 |
| -15℃ | 634 | 720 |
| -20℃ | 504 | 583 |
| -25℃ | 395 | 466 |
| -30℃ | 305 | 368 |
| -35℃ | 232 | 286 |
| -40℃ | 173 | 218 |
Boiling point be -51.6 DEG C or so of difluoromethane usually under the maximum pressure of mesohigh equipment and minimum temperature always
In gaseous state.Therefore, the saturated vapor pressure of difluoromethane does not provide herein, because it is not up to.
For ternary gas mixture of the invention first specific embodiment -30 DEG C at a temperature of composition are as follows:
The CO2 of the CH2F2 and 76mol% of C3F7CN, 20mol% of 4%mol%.
Such admixture of gas can reduce about 90% carbon equivalent of pure SF6
For ternary gas mixture of the invention second specific embodiment 25 DEG C at a temperature of composition are as follows:
The C02 of the CH2F2 and 74mol% of C3F7CN, 20mol% of 6.3mol%.
Such admixture of gas can reduce 89.2% carbon equivalent of pure SF6.
This programme preferably can effectively substitute the sulfur hexafluoride nowadays used in a device, and can be used identical
Production line production, it is only necessary to which the component for changing insulating gas preferably reduces cost, reduces the influence to environment and human body.
Claims (5)
1. a kind of mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas, including shell, the shell
It is filled with mixed gas, electric component in vivo, the outer side covering of the shell has solid dielectric layer, which is characterized in that described mixed
Closing gas includes seven fluorine isobutyronitriles, difluoromethane, buffer gas, and the buffer gas is carbon dioxide, nitrogen, oxygen, air
And its mixture.
2. outside the mesohigh equipment according to claim 1 for being filled with seven fluorine isobutyronitriles and difluoromethane mixed gas
Shell, which is characterized in that the mixed gas can play its insulating capacity completely, therefore corresponding device it is minimum at use temperature
The saturated vapor pressure of presentation selects the seven fluorine isobutyronitriles partial pressure in the apparatus is presented, in the filling temp of the equipment
Under, seven fluorine isobutyronitriles, which are presented partial pressure in the apparatus and are in seven fluorine isobutyronitriles, to be presented at use temperature the equipment is minimum
Saturated vapor pressure 95% to 100% between, the minimum temperature be -50 DEG C -0 DEG C.
3. outside the mesohigh equipment according to claim 1 for being filled with seven fluorine isobutyronitriles and difluoromethane mixed gas
Shell, which is characterized in that the seven fluorine isobutyronitrile, difluoromethane, rare gas molar percentage be respectively seven fluorine isobutyronitriles
1mol% to 20mol%, difluoromethane 1mol% to 40mol%, rare gas 40mol% to 98mol%.
4. outside the mesohigh equipment according to claim 1 for being filled with seven fluorine isobutyronitriles and difluoromethane mixed gas
Shell, which is characterized in that the thickness of the solid dielectric layer is the function of electric field utilization rate factor n, the electric field utilization rate factor n
Average field intensity (U/d) is defined as divided by maximum field intensity Emax(n)=U/ (Emax* d) resulting ratio,
When utilization rate factor is between 0.2 to 0.4, the solid dielectric layer is that thickness is greater than 1mm and is less than the thickness of 10mm
Layer,
When utilization rate factor is greater than 0.5, when especially greater than 0.6, the solid dielectric layer is that thickness is less than 1mm,
It is between 2-6 for the relative dielectric constant for preparing the selected material of the thick solid dielectric layer.
5. outside the mesohigh equipment according to claim 1 for being filled with seven fluorine isobutyronitriles and difluoromethane mixed gas
Shell, which is characterized in that the electric component includes gas insulation metal seal combined electrical apparatus (GIS), gas insulation switch cabinet (c-
GIS), gas-insulated transmission line (GIL), gas-insulated transformer (GIT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115409.2A CN109493995A (en) | 2018-09-25 | 2018-09-25 | Mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115409.2A CN109493995A (en) | 2018-09-25 | 2018-09-25 | Mesohigh device housings filled with seven fluorine isobutyronitriles and difluoromethane mixed gas |
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| Publication Number | Publication Date |
|---|---|
| CN109493995A true CN109493995A (en) | 2019-03-19 |
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Cited By (4)
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| CN110794269A (en) * | 2019-11-07 | 2020-02-14 | 云南电网有限责任公司电力科学研究院 | Green insulating gas insulating strength calculation method |
| CN112467599A (en) * | 2020-12-10 | 2021-03-09 | 云南电网有限责任公司保山供电局 | Medium-high pressure equipment shell filled with mixed gas of heptafluoroisobutyronitrile and difluoromethane |
| CN112510565A (en) * | 2020-12-10 | 2021-03-16 | 云南电网有限责任公司保山供电局 | Mixed gas insulating medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof |
| CN113433428A (en) * | 2021-05-10 | 2021-09-24 | 广西电网有限责任公司玉林供电局 | Synergistic effect analysis method of multi-component mixed insulating gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110794269A (en) * | 2019-11-07 | 2020-02-14 | 云南电网有限责任公司电力科学研究院 | Green insulating gas insulating strength calculation method |
| CN110794269B (en) * | 2019-11-07 | 2021-09-07 | 云南电网有限责任公司电力科学研究院 | Green insulating gas insulating strength calculation method |
| CN112467599A (en) * | 2020-12-10 | 2021-03-09 | 云南电网有限责任公司保山供电局 | Medium-high pressure equipment shell filled with mixed gas of heptafluoroisobutyronitrile and difluoromethane |
| CN112510565A (en) * | 2020-12-10 | 2021-03-16 | 云南电网有限责任公司保山供电局 | Mixed gas insulating medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof |
| CN113433428A (en) * | 2021-05-10 | 2021-09-24 | 广西电网有限责任公司玉林供电局 | Synergistic effect analysis method of multi-component mixed insulating gas |
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