CN114910757A - Rapid testing device and method for synergistic effect coefficient of insulating mixed gas - Google Patents
Rapid testing device and method for synergistic effect coefficient of insulating mixed gas Download PDFInfo
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- CN114910757A CN114910757A CN202210511864.4A CN202210511864A CN114910757A CN 114910757 A CN114910757 A CN 114910757A CN 202210511864 A CN202210511864 A CN 202210511864A CN 114910757 A CN114910757 A CN 114910757A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a device and a method for quickly testing the synergistic effect coefficient of an insulating mixed gas, and the device comprises a test cavity, wherein the test cavity comprises a seal cavity and a high-voltage sleeve communicated with the seal cavity, the high-voltage sleeve is fixedly connected with the seal cavity, one side of the seal cavity is provided with an air inlet mechanism and an air outlet mechanism, a test electrode mechanism is arranged in the test cavity, the test electrode mechanism comprises a conducting rod arranged in the test cavity, a flat electrode is arranged on the conducting rod, and the conducting rod is electrically connected with a transformer.
Description
Technical Field
The invention relates to the field of electric appliance tests, in particular to a device and a method for quickly testing a synergistic effect coefficient of an insulating mixed gas.
Background
SF 6 The gas has the characteristics of high insulating property and strong arc extinguishing capability, and is widely used in high-voltage equipment. But SF 6 Is a strong greenhouse gas with Global Warming Potential (GWP) as high as CO 2 23500 times of gas. SF 6 The gas is classified as greenhouse gas with limited use by international convention such as Paris convention, and SF is studied 6 Replacement gas is becoming a significant need in the power industry. Several novel environment-friendly insulating gases (hereinafter referred to as novel insulating gases) such as heptafluoroisobutyronitrile (C) are currently available 4 F 7 N), perfluoropentanone (C) 5 F 10 O), although excellent in insulating property, has a liquefaction temperature too high to be directly applied to electric equipment, and is currently only capable of passing buffer gas (e.g., N) 2 、CO 2 ) The mixing method solves the problem of high liquefaction temperature.
The insulating property of the mixed gas is not equal to the linear addition of the insulating properties of the two gases in a mixing ratio, but is greater (i.e., synergistic) or less (i.e., negative synergistic) than this value, which is called the synergistic effect of the mixed gas. The synergistic effect is crucial for the optimization of the dielectric strength of the gas mixture, the stronger the synergistic effect, the lower the mixing ratio required to achieve the same dielectric strength and the lower the liquefaction temperature. At present, the synergistic effect strength is mainly evaluated through a synergistic effect coefficient C, since the mechanism influencing the synergistic effect strength is very complex, theoretical calculation is very difficult, the synergistic effect coefficients under different proportions are mainly obtained through experimental measurement of breakdown voltage, and the calculation formula of the synergistic effect coefficients is as follows:
where k is the mixing ratio, i.e., the molar ratio of the novel insulating gas, Umax is the breakdown voltage when the novel insulating gas accounts for 100% (i.e., pure gas), Umin is the breakdown voltage when the novel insulating gas accounts for 0 (i.e., pure buffer gas), and Uk is the breakdown voltage when corresponding to the intermediate mixing ratio k. The smaller the value of C, the higher the intensity of the synergistic effect at this mixing ratio.
In order to obtain the synergistic effect coefficients under the same air pressure in different proportions, a large number of breakdown tests need to be carried out on mixed gases in different proportions. The existing breakdown test is carried out in a sealed cavity, and when the mixing proportion is regulated, the air pressure is required to be kept unchanged, so that the air is required to be vacuumized and then inflated again, the price of novel environment-friendly insulating gas is high, and the test cost is increased. Meanwhile, the test efficiency is low.
Disclosure of Invention
The invention aims to provide a device and a method for quickly testing the synergistic effect coefficient of an insulating mixed gas, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a rapid testing device for an insulation mixed gas synergistic effect coefficient, which comprises a test cavity, wherein the test cavity comprises a seal cavity and a high-voltage sleeve communicated with the seal cavity, the high-voltage sleeve is fixedly connected with the seal cavity, one side of the seal cavity is provided with an air inlet mechanism and an air outlet mechanism, a test electrode mechanism is arranged in the test cavity, the test electrode mechanism comprises a conductive rod arranged in the test cavity, a flat electrode is arranged on the conductive rod, and the conductive rod is electrically connected with a transformer.
Preferably, the conducting rod is including wearing to establish first conducting rod in the high-voltage bushing, the bottom of first conducting rod is passed seal chamber and stretch into in the seal chamber, first conducting rod stretches into one end in the seal chamber is installed dull and stereotyped electrode, the conducting rod is still including wearing to establish the second conducting rod of seal chamber bottom, the second conducting rod is close to the one end of first conducting rod is installed dull and stereotyped electrode, the second conducting rod stretches out seal chamber's one end is equipped with roll adjustment portion, the second conducting rod stretches out seal chamber's one end and ground contact.
Preferably, the distance adjusting part comprises a sealing nut installed on the outer side of the second conducting rod, and the outer wall of the second conducting rod is provided with scale marks.
Preferably, the two flat electrodes are parallel to each other and have a gap.
Preferably, the air inlet mechanism comprises two inflation pipelines communicated with the sealed cavity, the inflation pipelines are fixedly connected with the sealed cavity, a first air valve is arranged in the inflation pipelines, and the inflation pipelines are communicated with the air storage bottle.
Preferably, the air outlet mechanism comprises an air outlet pipeline communicated with the sealed cavity, the air outlet pipeline is fixedly connected with the sealed cavity, a second air valve is arranged in the air outlet pipeline, and the air outlet pipeline is communicated with the vacuum pump.
Preferably, one side of the sealed cavity body, which is far away from the gas discharge pipeline, is provided with an observation window.
Preferably, the high-voltage bushing is an epoxy resin insulating bushing, and the high-voltage bushing is fixedly connected with the sealed cavity through a flange.
Preferably, the top of the sealed cavity is provided with a barometer.
Preferably, the method for rapidly testing the synergistic effect coefficient of the insulating mixed gas comprises the following steps:
a. electrifying, namely installing two flat electrodes on the two conducting rods and electrifying;
b. air is pumped, and the air in the sealed cavity is exhausted through an air pumping mechanism;
c. inflating, namely inflating the sealed cavity by an air inlet mechanism according to a required proportion;
d. testing, adjusting the proportion of the mixed gas and recording experimental data;
e. and (4) calculating, namely calculating the synergistic effect coefficients under different mixing proportions according to test data.
The invention discloses the following technical effects: can need not the evacuation when adjusting the mixture ratio and aerify again, only need aerify once to novel insulating gas, carry out the power frequency breakdown test from high to low according to the mixture ratio, obtain the breakdown voltage of novel environment-friendly insulating mixed gas under the different mixture ratios for calculate its synergistic effect coefficient. The invention can continuously test the gas synergistic effect coefficient, does not need to repeatedly vacuumize and recharge gas during each proportion adjustment, reduces the waste of insulating gas, greatly improves the efficiency of the gas synergistic effect coefficient test, and greatly reduces the test cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a test chamber in the rapid testing device for synergistic effect coefficient of insulating mixed gas according to the present invention;
FIG. 2 is a schematic view showing the connection of the apparatus during the test;
FIG. 3 is a flow chart of the experimental procedure;
wherein: 1. an air bleed line; 2. an inflation pipeline; 31. a first air valve; 32. a second air valve; 4. a flange; 5. a high voltage bushing; 61. a first conductive rod; 62. a second conductive rod; 7. a barometer; 8. a plate electrode; 9. an observation window; 10. sealing the cavity; 11. a seal nut; 13. a vacuum pump; 14. a gas cylinder; 15. a transformer; 16. scale lines are marked.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-3, the invention provides a rapid testing device for a synergistic effect coefficient of an insulating mixed gas, which comprises a test cavity, wherein the test cavity comprises a seal cavity 10 and a high-voltage bushing 5 communicated with the seal cavity 10, the high-voltage bushing 5 is fixedly connected with the seal cavity 10, one side of the seal cavity 10 is provided with an air inlet mechanism and an air outlet mechanism, a test electrode mechanism is arranged in the test cavity and comprises a conductive rod arranged in the test cavity, a flat electrode 8 is arranged on the conductive rod, and the conductive rod is electrically connected with a transformer 15.
The conducting rod in the high-voltage bushing 5 is used for conducting voltage, the sealed cavity is used for mixing and storing mixed gas, the gas inlet mechanism and the gas outlet mechanism are used for controlling the gas charging and discharging speed and the gas charging and discharging amount, and the voltage level of the high-voltage bushing 5 is higher than the highest test voltage; the sealed cavity 10, the air inlet mechanism and the air outlet mechanism can bear the air pressure which is larger than the test air pressure, and the air is ensured not to leak. The rapid testing device for the synergistic effect coefficient of the insulating mixed gas can continuously test the synergistic effect coefficient of the gas, does not need to repeatedly vacuumize and recharge gas during proportion adjustment every time, reduces the waste of the insulating gas, greatly improves the efficiency of a test of the synergistic effect coefficient of the gas, and greatly reduces the test cost.
Further optimize the scheme, the conducting rod is including wearing to establish first conducting rod 61 in the high-voltage bushing 5, the bottom of first conducting rod 61 is passed seal chamber 10 and stretch into in the seal chamber 10, first conducting rod 61 stretches into one end in the seal chamber 10 is installed dull and stereotyped electrode 8, the conducting rod is still including wearing to establish the second conducting rod 62 of seal chamber 10 bottom, second conducting rod 62 is close to the one end of first conducting rod 61 is installed dull and stereotyped electrode 8, second conducting rod 62 stretches out seal chamber 10's one end is equipped with roll adjustment portion, second conducting rod 62 stretches out seal chamber 10's one end and ground contact.
The first conducting rod 61 penetrates through the high-voltage bushing 5 and extends into the sealed cavity 10, the second conducting rod 62 penetrates through the bottom of the sealed cavity 10, the flat plate electrode 8 is made of tungsten copper metal, threads of the flat plate electrode 8 are thin enough, the two flat plate electrodes 8 are parallel to each other, an air gap is provided for a breakdown test, the surface change of the tungsten copper material is not large after a large number of tests, and the stability of test results is guaranteed.
In a further optimized scheme, the distance adjusting part comprises a sealing nut 11 installed on the outer side of the second conducting rod 62, and the outer wall of the second conducting rod 62 is provided with scale marks 16 for adjusting and fixing the flat electrode 8 on the second conducting rod 62, so that the distance between the two electrodes can be measured and fixed.
In a further optimized scheme, the two flat electrodes 8 are parallel to each other and have a gap.
According to a further optimized scheme, the air inlet mechanism comprises two air charging pipelines 2 communicated with the sealed cavity 10, the air charging pipelines 2 are fixedly connected with the sealed cavity 10, a first air valve 31 is arranged in each air charging pipeline 2, and each air charging pipeline 2 is communicated with the air storage bottle 14 and used for charging air into the sealed cavity 10.
According to a further optimized scheme, the air outlet mechanism comprises an air outlet pipeline 1 communicated with the sealed cavity 10, the air outlet pipeline 1 is fixedly connected with the sealed cavity 10, a second air valve 32 is arranged in the air outlet pipeline 1, and the air outlet pipeline 1 is communicated with a vacuum pump 13 and used for discharging air in the sealed cavity 10.
The first air valve 31 and the second air valve 32 are used for controlling the inflation and deflation speed and the inflation and deflation amount.
In a further optimized scheme, an observation window 9 is arranged on one side of the sealed cavity 10 far away from the gas discharge pipeline 1 and is used for observing and serving as an operation opening for disassembling the flat plate electrode 8.
According to the further optimized scheme, the high-voltage bushing 5 is an epoxy resin insulating bushing, the high-voltage bushing 5 is fixedly connected with the sealed cavity 10 through a flange 4, the flange 4 is a metal flange, and the high-voltage bushing 5 is tightly connected with the sealed cavity 10 through the metal flange and is sealed.
In a further optimized scheme, the sealed cavity 10 is a metal cavity, and the top of the sealed cavity 10 is provided with a barometer 7 for measuring the air pressure in the sealed cavity 10.
A method for rapidly testing the synergistic effect coefficient of insulating mixed gas comprises the following steps:
a. electrifying, respectively installing two flat electrodes 8 on a first conducting rod 61 and a second conducting rod 62, keeping the second conducting rod 62 reliably grounded, and connecting the whole test device according to the graph 2;
b. air is extracted, the air in the sealed cavity 10 is exhausted through an air extraction mechanism, the sealed cavity 10 is vacuumized through the air exhaust pipeline 1 by using a vacuum pump 13, the air is washed for four to five times by using buffer gas through one of the air charging pipelines 2, and then the air is extracted to be vacuum, so that the influence caused by air impurities is avoided;
c. inflation according to the test pressure p (absolute pressure, the same applies hereinafter) and the highest test mixture ratio k max The pure gas for mixing is charged to the pressure p (1-k) through the charging line 2 max ) Recharging the novel insulating gas to a test pressure p;
d. testing, obtaining the breakdown voltage U under the mixing proportion kmax through a power frequency breakdown test max Adjusting the mixing ratio to k 1 When in use, the air is firstly exhausted to the air pressure through the air exhaust pipeline 1
Then, the buffer gas is charged to the gas pressure p, and the mixing ratio (k) is adjusted from high to low in the same manner 2 ，k 3 ……k n ，k min ) And performing power frequency breakdown test to obtain the breakdown voltage (U) of the mixed gas at different mixing ratios 2 ，U 3 ……U n ，U min )；
e. And calculating, namely calculating the synergistic effect coefficients under different mixing proportions according to the breakdown voltages of the mixed gases with different mixing proportions.
The invention adopts a new mixing ratio adjusting method, avoids the flow that the mixing ratio is adjusted and vacuumized again for refilling, greatly reduces the consumption of novel insulating gas and reduces the test cost; the air charging and discharging pipeline of the test cavity is improved, the repeated disassembly process during the adjustment of the mixing proportion is avoided, and the test efficiency is greatly accelerated.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides a quick testing arrangement of insulating gas mixture synergistic effect coefficient which characterized in that: including experimental cavity, experimental cavity include seal chamber (10) and with high-pressure bushing (5) of seal chamber (10) intercommunication, high-pressure bushing (5) with seal chamber (10) rigid coupling, one side of seal chamber (10) is equipped with air inlet mechanism and air outlet mechanism, be equipped with experimental electrode mechanism in the experimental cavity, experimental electrode mechanism is including setting up conducting rod in the experimental cavity, install dull and stereotyped electrode (8) on the conducting rod, conducting rod and transformer (15) electric connection.
2. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 1, wherein: the conducting rod is including wearing to establish first conducting rod (61) in high-voltage bushing (5), the bottom of first conducting rod (61) is passed seal chamber (10) and is stretched into in seal chamber (10), first conducting rod (61) stretches into one end in seal chamber (10) is installed dull and stereotyped electrode (8), the conducting rod is still including wearing to establish second conducting rod (62) of seal chamber (10) bottom, second conducting rod (62) are close to the one end of first conducting rod (61) is installed dull and stereotyped electrode (8), second conducting rod (62) stretch out the one end of seal chamber (10) is equipped with roll adjustment portion, second conducting rod (62) stretch out the one end and the ground contact of seal chamber (10).
3. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 2, wherein: the distance adjusting part comprises a sealing nut (11) installed on the outer side of the second conducting rod (62), and scale marks (16) are arranged on the outer wall of the second conducting rod (62).
4. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 3, wherein: the two flat electrodes (8) are parallel to each other and have a gap.
5. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 1, wherein: the air inlet mechanism comprises two air inflation pipelines (2) communicated with the seal cavity (10), the air inflation pipelines (2) are fixedly connected with the seal cavity (10), a first air valve (31) is arranged in each air inflation pipeline (2), and the air inflation pipelines (2) are communicated with the air storage bottle (14).
6. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 1, wherein: the air outlet mechanism comprises an air outlet pipeline (1) communicated with the sealed cavity (10), the air outlet pipeline (1) is fixedly connected with the sealed cavity (10), a second air valve (32) is arranged in the air outlet pipeline (1), and the air outlet pipeline (1) is communicated with a vacuum pump (13).
7. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 6, wherein: and an observation window (9) is arranged on one side of the sealed cavity (10) far away from the gas discharge pipeline (1).
8. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as recited in claim 1, wherein: the high-voltage bushing (5) is an epoxy resin insulating bushing, and the high-voltage bushing (5) is fixedly connected with the sealed cavity (10) through a flange (4).
9. The device for rapidly testing the synergistic effect coefficient of the insulating mixed gas as claimed in claim 1, wherein: and a barometer (7) is arranged at the top of the sealed cavity (10).
10. A quick test method for synergistic effect coefficients of insulating mixed gas is based on the quick test device for synergistic effect coefficients of insulating mixed gas in any one of claims 1 to 9, and comprises the following steps:
a. electrifying, namely installing two flat electrodes (8) on the two conducting rods and electrifying;
b. air is pumped, and the air in the sealed cavity (10) is exhausted through an air pumping mechanism;
c. inflating, namely inflating the sealed cavity (10) in a required proportion through an air inlet mechanism;
d. testing, adjusting the proportion of the mixed gas and recording experimental data;
e. and (4) calculating, namely calculating the synergistic effect coefficients under different mixing proportions according to test data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210511864.4A CN114910757A (en) | 2022-05-11 | 2022-05-11 | Rapid testing device and method for synergistic effect coefficient of insulating mixed gas |
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| CN202210511864.4A CN114910757A (en) | 2022-05-11 | 2022-05-11 | Rapid testing device and method for synergistic effect coefficient of insulating mixed gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310401A (en) * | 2023-09-08 | 2023-12-29 | 钧罡(宁波)金属精密部件有限公司 | Electrical component detection device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310401A (en) * | 2023-09-08 | 2023-12-29 | 钧罡(宁波)金属精密部件有限公司 | Electrical component detection device and method |
| CN117310401B (en) * | 2023-09-08 | 2024-05-03 | 钧罡(宁波)金属精密部件有限公司 | Electrical component detection device and method |
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