CN109300575A - The mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type - Google Patents
The mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type Download PDFInfo
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- CN109300575A CN109300575A CN201811114695.0A CN201811114695A CN109300575A CN 109300575 A CN109300575 A CN 109300575A CN 201811114695 A CN201811114695 A CN 201811114695A CN 109300575 A CN109300575 A CN 109300575A
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- gas
- trifluoroiodomethane
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- insulating medium
- friendly type
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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
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
Abstract
A kind of mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type, mixed gas insulating medium formula includes trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas, and preparation method includes vacuum step, mixing step.The beneficial effect is that: it can be good at the requirement for meeting the high-tension electricities equipment such as current gas-insulated transformer, gas insulated combined electrical equipment, gas-insulated power transfer conduit, there is the characteristics of excellent insulation performance, good environmental protection.
Description
Technical field
The present invention relates to a kind of dielectrics, more particularly, to a kind of mixed gas of trifluoroiodomethane of gas containing environment-friendly type
Dielectric and preparation method thereof.
Background technique
Using gas isolated mesolow electrical equipment, usually all using SF6 as dielectric.But SF6 be it is a kind of very
Strong greenhouse gases, global warming potential (global warming potential, GWP) is CO223900 times, and
Due to SF6Chemical property it is extremely stable, in an atmosphere be 3200 there are the time as long as, once leak into atmosphere
Substantially will not natural decomposition, therefore the influence to global warming have cumulative effect.In the Kyoto Protocol of signature in 1997
In, specify CO2, CH4, N2O, PFC, HFC and SF6Etc. the range for belonging to greenhouse gases, and require developed country first by greenhouse
The discharge amount of gas is frozen in the level of the 1990s, limits the use of or disable substantially SF to the year two thousand twenty6Gas.
Therefore suitable environment-friendly type insulated medium need be searched out to substitute SF6, both guaranteed and SF6With similar insulation
Performance, and meet the industrial applications requirement such as nonhazardous, nonflammable, while will not have a negative impact to environment.
In consideration of it, there is scholar to be proposed with SF6The method that mixes with buffer gas alleviates SF6Gas is to the unfavorable of environment
It influences.But due to gas-insulated ability reduction after mixing, need to increase pressure instead to guarantee insulation effect, this undoubtedly will
Increase manufacturing process difficulty and cost, horizontal to the anti-leak of equipment in safety indexes propose harsher requirement.It solves
Certainly SF6Gas greenhouse effects are serious, to the disagreeableness problem of environment, search out suitable SF6Substitution insulating gas is the most thoroughly
With effective solution method.
Summary of the invention
The purpose of the present invention is to solve the above problems, devise a kind of mixing of trifluoroiodomethane of gas containing environment-friendly type
Gas-insulated medium and preparation method thereof.Specific design scheme are as follows:
A kind of mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type, mixed gas insulating medium
Formula include trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas, preparation method include vacuum step,
Mixing step,
In the vacuum step, closed container is taken, one high vacuum valve and bottom inflatable valve are installed in its bottom,
Top is equipped with top inflatable valve, is vacuumized by high vacuum valve goalkeeper's closed container,
In the mixing step, trifluoroiodomethane gas, octafluorocyclobutane gas are filled with from top inflatable valve, carbon dioxide
Gas is filled with from bottom inflatable valve, and each gas component is uniformly mixed after being filled with by setting content.
Volume percent content in the mixed gas insulating medium formula between each ingredient is trifluoro iodine first
Alkane gas 20-25%, octafluorocyclobutane gas 5-10%, trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas are whole
The percent by volume of body is 100%.
The purity of the trifluoroiodomethane gas is greater than 99.99%, CF3I is also excellent in terms of electric property, identical
Under air pressure, dielectric strength can reach 1.2 times of sulfur hexafluoride or more, and insulating capacity is slightly different according to the size of drop-out current,
Component gas CF3Decomposition product of the I when electric current is cut-off mainly has iodine, C2F6,C2F4,C2F5I, C3F8, CHF3,
C3F6, CH3I belongs to low toxicity or innocuous substance；
The purity of the octafluorocyclobutane gas is greater than 99.99%, and octafluorocyclobutane is a kind of colourless, tasteless, non-flammable gas
Body；GWP value is approximately SF637%, be 8900.With SF6It is smaller compared to the influence to environment.The gas totally nontoxic, ozone free shadow
It rings, pure c-C4F8Dielectric strength of the gas under uniform electric field is about SF61.3 times of gas；
It is buffer gas that the purity of the carbon dioxide gas, which is greater than 99.99%, CO2, is mainly used for reducing the liquefaction of mixed gas
Temperature simultaneously enhances whole insulation performance.The condensing temperature for the mixed gas that the present invention eventually forms can be reduced to -40 DEG C of left sides
The right side can satisfy the requirement in the most areas in China.
In the vacuum step, the vacuum degree in closed container meets air pressure inside less than 10Pa.
In aeration step, trifluoroiodomethane gas, octafluorocyclobutane gas first are filled with from top inflatable valve, then from bottom
Charging valve is filled with carbon dioxide gas.
The Mixed gas insulation for the trifluoroiodomethane of gas containing environment-friendly type that above-mentioned technical proposal through the invention obtains is situated between
Matter and preparation method thereof, the beneficial effect is that:
It can be good at meeting the high pressures such as current gas-insulated transformer, gas insulated combined electrical equipment, gas-insulated power transfer conduit
The requirement of power equipment has the characteristics of excellent insulation performance, good environmental protection.
Detailed description of the invention
Fig. 1 is the insulation performance figure of trifluoroiodomethane gas of the present invention, ball plate electrode, pole span 20mm；
Fig. 2 be in CF3I/70%CO2 gas of the present invention be added octafluorocyclobutane gas insulation performance figure, ball plate electrode,
Pole span 20mm.
Specific embodiment
The present invention is specifically described with reference to the accompanying drawing.
A kind of mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type, Mixed gas insulation
Medium formula includes trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas, and preparation method includes vacuumizing step
Suddenly, mixing step,
In the vacuum step, closed container is taken, one high vacuum valve and bottom inflatable valve are installed in its bottom,
Top is equipped with top inflatable valve, is vacuumized by high vacuum valve goalkeeper's closed container,
In the mixing step, trifluoroiodomethane gas, octafluorocyclobutane gas are filled with from top inflatable valve, carbon dioxide
Gas is filled with from bottom inflatable valve, and each gas component is uniformly mixed after being filled with by setting content.
Volume percent content in the mixed gas insulating medium formula between each ingredient is trifluoro iodine first
Alkane gas 20-25%, octafluorocyclobutane gas 5-10%, trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas are whole
The percent by volume of body is 100%.
The purity of the trifluoroiodomethane gas is greater than 99.99%, CF3I is also excellent in terms of electric property, identical
Under air pressure, dielectric strength can reach 1.2 times of sulfur hexafluoride or more, and insulating capacity is slightly different according to the size of drop-out current,
Component gas CF3Decomposition product of the I when electric current is cut-off mainly has iodine, C2F6,C2F4,C2F5I, C3F8, CHF3,
C3F6, CH3I belongs to low toxicity or innocuous substance；
The purity of the octafluorocyclobutane gas is greater than 99.99%, and octafluorocyclobutane is a kind of colourless, tasteless, non-flammable gas
Body；GWP value is approximately SF637%, be 8900.With SF6It is smaller compared to the influence to environment.The gas totally nontoxic, ozone free shadow
It rings, pure c-C4F8Dielectric strength of the gas under uniform electric field is about SF61.3 times of gas；
It is buffer gas that the purity of the carbon dioxide gas, which is greater than 99.99%, CO2, is mainly used for reducing the liquefaction of mixed gas
Temperature simultaneously enhances whole insulation performance.The condensing temperature for the mixed gas that the present invention eventually forms can be reduced to -40 DEG C of left sides
The right side can satisfy the requirement in the most areas in China.
In the vacuum step, the vacuum degree in closed container meets air pressure inside less than 10Pa.
In aeration step, trifluoroiodomethane gas, octafluorocyclobutane gas first are filled with from top inflatable valve, then from bottom
Charging valve is filled with carbon dioxide gas.
CF3The greenhouse effects index of I is only CO25 times and SF623900 compare, almost can be ignored, and c-
The GWP of C4F8 is SF637%, 5% ~ 10% is only accounted in this component, environmental-protecting performance is excellent.
CF3I, c-C4F8, CO2Potential (ODP 0) all is destroyed without greenhouse, ozone layer will not be damaged.
In specified content range, CF3I/c-C4F8/CO2The insulating capacity of mixed gas is with CF3The increasing of I gas ratio
Add and is exponentially increased.
The main decomposition of environment-friendly type mixed gas insulating medium proposed by the invention under power equipment operating status produces
Object is non-toxic or low-toxic property substance, and the main decomposition products under arcing also belong to non-toxic or low-toxic substance, will not
Serious harm is caused to human body.
Preparation method proposed by the invention emphasizes sequencing and the position of inflation, the i.e. big CF of density3I、c-C4F8Gas
Body is first filled with closed container, the small CO of density from top2It is filled with from bottom, can be reduced mixing time of repose in this way and keeps gas mixed
It closes more uniform.
The frequency breakdown voltage of CF3I/CO2 mixed gas is after CF3I content is more than 20%, then continues to increase CF3I gas
Insulation performance variation is smaller.After fixed co2 gas is 70% in CF3I/CO2 mixed gas, CF3I gas content is reduced, is added
The insulating capacity of mixed gas is improved after c-C4F8, the insulation of mixed gas when c-C4F8 mixed gas reaches 10%
Performance is substantially saturated, thus c-C4F8 content be higher than 10% after to improve Mixed gas insulation performance integrally promoted it is smaller, due to
The GWP of c-C4F8 gas is 8900, and mixed gas environmental-protecting performance can also be reduced by excessively increasing the gas content.
The present invention is described in detail combined with specific embodiments below.
Embodiment 1
It takes CF3I, c-C4F8 and CO2 to carry out physical mixed at normal temperature, obtains a kind of mixed gas insulating medium of environmental protection,
In the dielectric, the volume fraction that the volume fraction that the volume fraction of CF3I is 20%, c-C4F8 is 10%, CO2 is 70%.It obtains
The method for obtaining the environment-friendly type insulated medium is in metal containment unit of the arbitrary height less than 30m, to be first evacuated to closed container
Then 10Pa or less vacuum state successively pours c-C4F8, CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 2
It takes CF3I, c-C4F8 and CO2 to carry out physical mixed at normal temperature, obtains a kind of mixed gas insulating medium of environmental protection,
In the dielectric, the volume fraction that the volume fraction that the volume fraction of CF3I is 21%, c-C4F8 is 9%, CO2 is 70%.It obtains
The method of the environment-friendly type insulated medium is in metal containment unit of the arbitrary height less than 30m, to be first evacuated to closed container
Then 10Pa or less vacuum state successively pours c-C4F8, CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 3
It takes CF3I, c-C4F8 and CO2 to carry out physical mixed at normal temperature, obtains a kind of mixed gas insulating medium of environmental protection,
In the dielectric, the volume fraction that the volume fraction that the volume fraction of CF3I is 22%, c-C4F8 is 8%, CO2 is 70%.It obtains
The method of the environment-friendly type insulated medium is in metal containment unit of the arbitrary height less than 30m, to be first evacuated to closed container
Then 10Pa or less vacuum state successively pours c-C4F8, CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 4
It takes CF3I, c-C4F8 and CO2 to carry out physical mixed at normal temperature, obtains a kind of mixed gas insulating medium of environmental protection,
In the dielectric, the volume fraction that the volume fraction that the volume fraction of CF3I is 23%, c-C4F8 is 7%, CO2 is 70%.It obtains
The method of the environment-friendly type insulated medium is in metal containment unit of the arbitrary height less than 30m, to be first evacuated to closed container
Then 10Pa or less vacuum state successively pours c-C4F8, CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 5
It takes CF3I, c-C4F8 and CO2 to carry out physical mixed at normal temperature, obtains a kind of mixed gas insulating medium of environmental protection,
In the dielectric, the volume fraction that the volume fraction that the volume fraction of CF3I is 24%, c-C4F8 is 6%, CO2 is 70%.It obtains
The method of the environment-friendly type insulated medium is in metal containment unit of the arbitrary height less than 30m, to be first evacuated to closed container
Then 10Pa or less vacuum state successively pours c-C4F8, CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 6
Take CF3I、c-C4F8Physical mixed is carried out at normal temperature with CO2, a kind of mixed gas insulating medium of environmental protection is obtained, at this
In dielectric, CF3The volume fraction of I is 25%, c-C4F8Volume fraction be 5%, CO2 volume fraction be 70%.It is somebody's turn to do
The method of environment-friendly type insulated medium is that in metal containment unit of the arbitrary height less than 30m, closed container is first evacuated to 10Pa
Following vacuum state, then successively pours c-C4F8、CF3I, CO2 gas.Mixed gas stands 48 hours and is uniformly mixed.
Embodiment 7
The relevant nature comparative analysis of mixed gas insulating medium and conventional SF6 prepared by above-described embodiment 1-6 (calculates
GWP value, it is known that the GWP that the GWP that the GWP of CF3I is 5, CO2 is 1, c-C4F8 is 8900, calculates temperature effect by volume fraction and refers to
Number,
Such as: embodiment 1:0.2*5+0.1*8900+0.7*1=891.7),
Its result is as shown in the table:
It can thus be seen that environment-friendly type mix insulation gas provided by the present invention, can not only reach and insulating properties similar in SF6
Can, and environment is influenced to significantly reduce and even is eliminated, while condensing temperature also can satisfy the requirement of current engineer application.
Embodiment 8
Comparative example 1: on the basis of embodiment 1, the volumn concentration of each component gas is changed in dielectric: CF3I volume
Score is 10%, c-C4F8Volume fraction be 20%, CO2It is 70%.
Comparative example 2: on the basis of embodiment 1, the volumn concentration of each component gas is changed in dielectric: CF3I
Volume fraction is 29%, c-C4F8Volume fraction be 1%, CO2It is 70%.
Comparative example 3: on the basis of embodiment 1, the volumn concentration of each component gas is changed in dielectric: CF3I
Volume fraction is 30%, CO2It is 70%.
Comparative example 4: on the basis of embodiment 1, the volumn concentration of each component gas is changed in dielectric: c-
C4F8Volume fraction be 30%, CO2It is 70%.
By the mixed gas insulating medium and conventional SF of above-mentioned comparative example 1-4 preparation6Relevant nature comparative analysis,
As a result as shown in the table:
As can be known from the above table, work as c-C4F8It is opposite with SF under equal conditions when ratio is lower (comparative example 2 and comparative example 3)6Insulation
Ability is lower, and only 0.8 or so, work as c-C4F8Content is higher and CF3When I gas ratio is lower (comparative example 1 and comparative example 4), mix
It is higher to close gas GWP value, has greater environmental impacts, environmental-protecting performance reduces and its insulating capacity is substantially saturated and does not mention significantly
It rises.
Above-mentioned technical proposal only embodies the optimal technical scheme of technical solution of the present invention, those skilled in the art
The principle of the present invention is embodied to some variations that some of them part may be made, belongs to the scope of protection of the present invention it
It is interior.
Claims (5)
1. a kind of mixed gas insulating medium and preparation method thereof of the trifluoroiodomethane of gas containing environment-friendly type, which is characterized in that mixed
Closing gas-insulated medium formula includes trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide gas, preparation method packet
Vacuum step, mixing step are included,
In the vacuum step, closed container is taken, one high vacuum valve and bottom inflatable valve are installed in its bottom,
Top is equipped with top inflatable valve, is vacuumized by high vacuum valve goalkeeper's closed container,
In the mixing step, trifluoroiodomethane gas, octafluorocyclobutane gas are filled with from top inflatable valve, carbon dioxide
Gas is filled with from bottom inflatable valve, and each gas component is uniformly mixed after being filled with by setting content.
2. mixed gas insulating medium and its preparation side of the trifluoroiodomethane of gas containing environment-friendly type according to claim 1
Method, which is characterized in that the volume percent content in the mixed gas insulating medium formula between each ingredient is three
Fluorine iodomethane gas 20-25%, octafluorocyclobutane gas 5-10%, trifluoroiodomethane gas, octafluorocyclobutane gas, carbon dioxide
The percent by volume of gas entirety is 100%.
3. mixed gas insulating medium and its preparation side of the trifluoroiodomethane of gas containing environment-friendly type according to claim 1
Method, which is characterized in that
The purity of the trifluoroiodomethane gas is greater than 99.99%；
The purity of the octafluorocyclobutane gas is greater than 99.99%；
The purity of the carbon dioxide gas is greater than 99.99%.
4. mixed gas insulating medium and its preparation side of the trifluoroiodomethane of gas containing environment-friendly type according to claim 1
Method, which is characterized in that in the vacuum step, the vacuum degree in closed container meets air pressure inside less than 10Pa.
5. mixed gas insulating medium and its preparation side of the trifluoroiodomethane of gas containing environment-friendly type according to claim 1
Method, which is characterized in that in aeration step, it first is filled with trifluoroiodomethane gas, octafluorocyclobutane gas from top inflatable valve, then
Carbon dioxide gas is filled with from bottom inflatable valve.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109830912A (en) * | 2019-03-29 | 2019-05-31 | 武汉大学 | A kind of modified formula of environmental-protective gas-insulating medium |
| CN112489852A (en) * | 2020-12-10 | 2021-03-12 | 云南电网有限责任公司保山供电局 | Mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof |
| 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 |
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| CN107947009A (en) * | 2017-11-09 | 2018-04-20 | 苏州正罡互感器有限公司 | A kind of fluorinated mix insulation gas and its application |
| CN107968350A (en) * | 2017-10-24 | 2018-04-27 | 上海交通大学 | A kind of mixed gas arc-extinguishing medium of the trifluoroiodomethane of gas containing environment-friendly type and preparation method thereof |
| CN108514846A (en) * | 2018-06-05 | 2018-09-11 | 深圳供电局有限公司 | A kind of mix insulation gas-dynamic air distributing device |
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| CN106602454A (en) * | 2016-12-15 | 2017-04-26 | 国家电网公司 | Medium-voltage switchgear by employing trifluoroiodomethane and mixture thereof as insulating medium |
| CN107968350A (en) * | 2017-10-24 | 2018-04-27 | 上海交通大学 | A kind of mixed gas arc-extinguishing medium of the trifluoroiodomethane of gas containing environment-friendly type and preparation method thereof |
| CN107947009A (en) * | 2017-11-09 | 2018-04-20 | 苏州正罡互感器有限公司 | A kind of fluorinated mix insulation gas and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109830912A (en) * | 2019-03-29 | 2019-05-31 | 武汉大学 | A kind of modified formula of environmental-protective gas-insulating medium |
| CN112489852A (en) * | 2020-12-10 | 2021-03-12 | 云南电网有限责任公司保山供电局 | Mixed gas arc-extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method thereof |
| 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 |
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Application publication date: 20190201 |