CN113608079A - Method, device, equipment and storage medium for analyzing insulation performance of insulating gas - Google Patents
Method, device, equipment and storage medium for analyzing insulation performance of insulating gas Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 103
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- 239000007789 gas Substances 0.000 description 274
- 229910018503 SF6 Inorganic materials 0.000 description 65
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 65
- 229960000909 sulfur hexafluoride Drugs 0.000 description 65
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 38
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- 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
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- 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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Abstract
The invention discloses an insulating property analysis method of insulating gas, which comprises the steps of respectively measuring breakdown voltages of the insulating gas to be measured under slightly non-uniform electric fields and extremely non-uniform electric fields to obtain a first breakdown voltage and a second breakdown voltage; calculating the change sensitivity coefficient of the electric field to be detected according to the first breakdown voltage and the second breakdown voltage; and analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient. The invention also discloses an insulating property analysis device, equipment and a storage medium of the insulating gas, which can determine the sensitivity coefficient of the insulating gas to be detected to the electric field change by measuring the breakdown voltage of the insulating gas to be detected under a slightly uneven electric field and an extremely uneven electric field, and further obtain the sensitivity degree of the insulating gas to be detected to the electric field change by combining the pre-obtained sensitivity coefficient of the SF6 gas to the electric field change, so as to analyze the insulating property of the insulating gas to be detected.
Description
Technical Field
The invention relates to the field of electrical technology, in particular to a method, a device, equipment and a storage medium for analyzing the insulation performance of insulating gas.
Background
In the field of power industry, sulfur hexafluoride (SF6) is used as a good gas insulator, and its excellent insulating property and arc extinguishing capability, as well as stable chemical properties, non-toxicity, and non-flammability, etc., so that sulfur hexafluoride is widely used in gas insulation equipment, but sulfur hexafluoride gas molecules have strong greenhouse effect capability and potential harm to greenhouse effect, the influence of one molecule of sulfur hexafluoride gas on greenhouse effect is 20000 over times of that of CO2 molecule, and meanwhile, the retention time of sulfur hexafluoride gas discharged in the atmosphere is as long as 3000 years, in addition, when sulfur hexafluoride is subjected to breakdown discharge, toxic substances are released, and the health of workers is threatened, so that it is urgently needed to find an insulating substitute gas for relieving the greenhouse effect caused by sulfur hexafluoride and ensuring the health of workers.
The current research on the insulation performance of the insulation substitute gas is still in the preliminary stage, the research direction is still deficient, particularly, the research on the sensitivity degree of the gas to the electric field change is not available, and the test method on the sensitivity degree of the gas to the electric field change in the gas insulation equipment is not reported.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device, equipment and a storage medium for analyzing the insulation performance of an insulating gas. The method comprises the steps of measuring breakdown voltages of the insulating gas to be measured in slightly uneven electric fields and extremely uneven electric fields, determining the sensitivity coefficient of the insulating gas to be measured to electric field changes according to each measured breakdown voltage, further obtaining the sensitivity degree of the insulating gas to be measured to the electric field changes according to the sensitivity coefficient of the insulating gas to be measured to the electric field changes and the pre-obtained sensitivity coefficient of sulfur hexafluoride (SF6) to the electric field changes, and analyzing the insulating property of the insulating gas to be measured.
In order to achieve the above object, an embodiment of the present invention provides an insulation performance analysis method for an insulation gas, including:
measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain a first breakdown voltage;
measuring the breakdown voltage of the insulating gas to be detected under the extremely-uneven electric field to obtain a second breakdown voltage;
calculating the change sensitivity coefficient of the electric field to be detected according to the first breakdown voltage and the second breakdown voltage;
and analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient.
As an improvement of the above scheme, the calculating a sensitivity coefficient of change of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage specifically includes:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
As an improvement of the above solution, the reference electric field variation sensitivity coefficient is obtained by:
measuring the breakdown voltage of the SF6 gas under a slightly uneven electric field to obtain a first reference voltage;
measuring the breakdown voltage of the SF6 gas under the extremely-uneven electric field to obtain a second reference voltage;
and subtracting the first reference voltage from the second reference voltage, and dividing by the first reference voltage to obtain a reference electric field change sensitivity coefficient.
As an improvement of the above, the method further comprises:
performing an insulation dielectric breakdown test on the insulating gas to be tested to obtain the relative insulation strength of the insulating gas to be tested relative to the SF6 gas;
calculating the greenhouse effect potential value of the insulating gas to be detected to obtain the greenhouse effect potential value to be detected;
and analyzing the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected, the reference electric field change sensitivity coefficient, the relative insulating strength of the insulating gas to be detected relative to the SF6 gas, the greenhouse effect potential value to be detected and the greenhouse effect potential value of the SF6 gas acquired in advance to obtain the feasibility evaluation result of the insulating gas to be detected replacing the SF6 gas and used as the insulating gas of the gas insulating equipment.
In order to achieve the above object, an embodiment of the present invention further provides an apparatus for analyzing insulation performance of an insulating gas, including:
the first breakdown voltage measuring module is used for measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain first breakdown voltage;
the second breakdown voltage measuring module is used for measuring the breakdown voltage of the insulating gas to be measured under the extremely-uneven electric field to obtain a second breakdown voltage;
the sensitivity coefficient calculation module to be measured is used for calculating the change sensitivity coefficient of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage;
and the insulation performance analysis module is used for analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient.
As an improvement of the above scheme, the sensitivity coefficient calculation module to be measured is specifically configured to:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
As an improvement of the above scheme, the apparatus further includes a reference sensitivity coefficient calculation module, where the reference sensitivity coefficient calculation module specifically includes:
the first reference voltage measuring unit is used for measuring the breakdown voltage of the SF6 gas under a slightly nonuniform electric field to obtain a first reference voltage;
the second reference voltage measuring unit is used for measuring the breakdown voltage of the SF6 gas under the extremely-uneven electric field to obtain a second reference voltage;
and the reference sensitive coefficient calculating unit is used for subtracting the first reference voltage from the second reference voltage and dividing the first reference voltage by the second reference voltage to obtain a reference electric field change sensitive coefficient.
As an improvement of the above, the apparatus further comprises:
the insulation dielectric breakdown test module is used for carrying out an insulation dielectric breakdown test on the insulation gas to be tested to obtain the relative insulation strength of the insulation gas to be tested relative to the SF6 gas;
the greenhouse effect potential value calculation module is used for calculating the greenhouse effect potential value of the insulating gas to be detected to obtain the greenhouse effect potential value to be detected;
and the feasibility evaluation module is used for analyzing the insulating gas to be tested according to the electric field change sensitivity coefficient to be tested, the reference electric field change sensitivity coefficient, the relative insulating strength of the insulating gas to be tested relative to the SF6 gas, the greenhouse effect potential value to be tested and the greenhouse effect potential value of the SF6 gas acquired in advance to obtain a feasibility evaluation result of the insulating gas to be tested replacing the SF6 gas and used as the insulating gas of the gas insulating equipment.
In order to achieve the above object, an embodiment of the present invention further provides an insulation performance analysis apparatus for an insulation gas, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the insulation performance analysis method for an insulation gas according to any one of the above embodiments when executing the computer program.
In order to achieve the above object, an embodiment of the present invention further provides a storage medium, where the storage medium includes a stored computer program, and when the computer program runs, the apparatus on which the storage medium is located is controlled to execute the method for analyzing the insulation performance of the insulating gas according to any one of the above embodiments.
Compared with the prior art, the method, the device, the equipment and the storage medium for analyzing the insulation performance of the insulating gas disclosed by the embodiment of the invention have the advantages that the first breakdown voltage and the second breakdown voltage are obtained by respectively measuring the breakdown voltages of the insulating gas to be measured under slightly non-uniform electric fields and extremely non-uniform electric fields, and the change sensitivity coefficient of the electric field to be measured is calculated according to the first breakdown voltage and the second breakdown voltage; and then, according to the electric field change sensitivity coefficient to be detected and a pre-obtained reference electric field change sensitivity coefficient, carrying out insulation performance analysis on the insulating gas to be detected. According to the embodiment of the invention, the breakdown voltage of the insulating gas to be detected in a slightly non-uniform electric field and an extremely non-uniform electric field is measured, the sensitivity coefficient of the insulating gas to be detected to the electric field change is determined according to each measured breakdown voltage, the sensitivity degree of the insulating gas to be detected to the electric field change is further obtained according to the sensitivity coefficient of the insulating gas to be detected to the electric field change and the pre-obtained sensitivity coefficient of sulfur hexafluoride to the electric field change, and the insulation performance of the insulating gas to be detected is analyzed.
Drawings
Fig. 1 is a flowchart of a method for analyzing an insulation property of an insulation gas according to an embodiment of the present invention;
FIG. 2 is a table showing the sensitivity of the insulating gas to be tested and the SF6 gas to changes in electric field according to one embodiment of the present invention;
FIG. 3 is a line graph illustrating the sensitivity coefficients of the insulating gas to be tested and the SF6 gas to the change of the electric field according to one embodiment of the present invention;
FIG. 4 is a line graph of gas breakdown characteristics for different electric field non-uniformity coefficients provided by an embodiment of the present invention;
FIG. 5 is a table of the electric field distribution and its electric field non-uniformity for different radii of curvature provided by an embodiment of the present invention;
fig. 6 is a block diagram of an apparatus for analyzing insulation performance of an insulating gas according to an embodiment of the present invention;
fig. 7 is a block diagram showing another apparatus for analyzing the insulation performance of an insulating gas according to an embodiment of the present invention;
FIG. 8 is a block diagram of a reference sensitivity coefficient calculation module according to an embodiment of the present invention;
fig. 9 is a block diagram showing another apparatus for analyzing the insulation performance of an insulating gas according to an embodiment of the present invention;
fig. 10 is a block diagram of an apparatus for analyzing insulation performance of an insulating gas according to an embodiment of the present invention.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which is a flowchart of an insulation performance analysis method of an insulation gas according to an embodiment of the present invention, the method includes steps S11 to S14:
s11, measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain a first breakdown voltage;
s12, measuring the breakdown voltage of the insulating gas to be measured under the extremely-uneven electric field to obtain a second breakdown voltage;
s13, calculating a change sensitivity coefficient of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage;
and S14, analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient.
Specifically, the non-uniform electric field may be classified into a slightly non-uniform electric field and a very non-uniform electric field according to the degree of non-uniformity of the electric field. If the non-uniformity of the electric field is not severe, the gas gap is broken down when the interpolar voltage is high enough to cause self-sustaining discharge of the gas medium, and the electric field is called a slightly non-uniform electric field; if the non-uniform degree of the electric field is relatively serious, when the interelectrode voltage reaches a value sufficient to cause the gas medium to generate self-sustaining discharge, the gas gap is not broken down, only the gas at the position with higher electric field intensity generates corona discharge, and the gas gap is broken down after the voltage is further increased, so the electric field is called as the non-uniform electric field.
Illustratively, the number of the insulating gases to be detected is 5, and the insulating gases to be detected are a first insulating gas to be detected (4% C4F7N/CO2), a second insulating gas to be detected (6% C4F7N/CO2), a third insulating gas to be detected (8% C4F7N/CO2), a fourth insulating gas to be detected (10% C4F7N/CO2) and a fifth insulating gas to be detected (12% C4F7N/CO2), wherein the 4% C4F7N/CO2 refers to 4% of C4F7N in the mixed gas, the value of the electric field non-uniformity coefficient of the slightly non-uniform electric field is set to be 1.04, and the value of the electric field non-uniformity coefficient of the extremely non-uniform electric field is 14.22. Under the pressure of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa and 0.6MPa, respectively measuring a corresponding first breakdown voltage of each insulating gas to be tested under an electric field with an electric field nonuniformity coefficient of 1.04, under the same condition, respectively measuring a corresponding second breakdown voltage of each insulating gas to be tested under an electric field with an electric field nonuniformity coefficient of 14.22, respectively calculating an electric field transformation sensitivity coefficient of each insulating gas to be tested under each pressure according to the measured first breakdown voltage and second breakdown voltage, and respectively calculating the calculation results according to a sensitivity coefficient chart of each insulating gas to be tested and SF6 gas to electric field variation shown in figure 2 and a sensitivity coefficient broken line chart of each insulating gas to be tested and SF6 gas to electric field variation shown in figure 3, and analyzing the insulating performance of the insulating gas to be tested according to figures 2 and 3.
It should be noted that the values of the slightly non-uniform coefficient and the extremely non-uniform coefficient are not limited to the specific values, the insulating gas to be measured is not limited to the specific values, and the pressure intensity is not limited to the specific values, and can be set according to actual conditions.
Compared with the prior art, the insulation performance analysis method of the insulating gas disclosed by the embodiment of the invention obtains the first breakdown voltage and the second breakdown voltage by respectively measuring the breakdown voltages of the insulating gas to be detected under slightly non-uniform electric fields and extremely non-uniform electric fields, and calculates the change sensitivity coefficient of the electric field to be detected according to the first breakdown voltage and the second breakdown voltage; the electric field change sensitivity coefficient to be detected represents the sensitivity degree of the insulating gas to be detected to the electric field change; and then, according to the electric field change sensitivity coefficient to be detected and a pre-obtained reference electric field change sensitivity coefficient, carrying out insulation performance analysis on the insulating gas to be detected. According to the embodiment of the invention, the breakdown voltage of the insulating gas to be detected in a slightly non-uniform electric field and an extremely non-uniform electric field is measured, the sensitivity coefficient of the insulating gas to be detected to the electric field change is determined according to each measured breakdown voltage, and the sensitivity degree of the insulating gas to be detected to the electric field change is obtained according to the coefficient degree of the insulating gas to be detected to the electric field change and the pre-obtained sensitivity coefficient of sulfur hexafluoride (SF6) to the electric field change, so that the insulation performance of the insulating gas to be detected is analyzed.
In an embodiment, the calculating the sensitivity coefficient of electric field change to be measured according to the first breakdown voltage and the second breakdown voltage in step S13 specifically includes:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
It should be noted that, as the electric field variation sensitivity coefficient of the insulating gas to be measured is larger, the sensitivity of the insulating gas to be measured to the electric field variation (the electric field non-uniform coefficient is larger) is smaller; the smaller the electric field variation sensitivity coefficient of the insulating gas to be measured is, the larger the sensitivity of the insulating gas to be measured to the electric field variation (the larger the electric field nonuniformity coefficient) is.
In one embodiment, the reference electric field variation sensitivity coefficient in step S14 is obtained by the following steps, including steps S141 to S143:
s141, measuring breakdown voltage of the SF6 gas under the slightly nonuniform electric field to obtain first reference voltage;
s142, measuring the breakdown voltage of the SF6 gas under the extremely-uneven electric field to obtain a second reference voltage;
and S143, subtracting the first reference voltage from the second reference voltage, and dividing the first reference voltage by the second reference voltage to obtain a reference electric field change sensitivity coefficient.
Illustratively, the value of the field nonuniformity coefficient of the slightly nonuniform electric field is set to be 1.04, the value of the field nonuniformity coefficient of the extremely nonuniform electric field is set to be 14.22, a first reference voltage of the SF6 gas under the slightly nonuniform electric field is measured under the pressures of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa and 0.6MPa respectively, a second reference voltage of the SF6 gas under the extremely nonuniform electric field is measured respectively under the same conditions, and the electric field variation sensitivity coefficient of the SF6 gas under each pressure is calculated respectively according to the measured first reference voltage and the measured second reference voltage. As can be seen from FIGS. 2 and 3, the sensitivity coefficient (Es) of the electric field variation of the C4F7N/CO2 mixed gas is smaller than that of SF6 as a whole, which shows that the C4F7N/CO2 mixed gas is more sensitive to the non-uniform coefficient of the electric field. Secondly, as the content of the C4F7N is increased, the Es value is smaller, which shows that the absolute content of the C4F7N has a larger influence on the electric field sensitivity of the mixed gas, and the sensitivity is even stronger than that of the pure SF 6. The influence of the nonuniform coefficient of the electric field on the mixed gas of C4F7N is large, the discharge inhibition effect of C4F7N under the nonuniform electric field is poor, and the higher the content is, the higher the requirement on the roughness of the metal surface in the equipment is.
In one embodiment, the method further includes steps S15-S17:
s15, conducting an insulation dielectric breakdown test on the insulating gas to be tested to obtain the relative insulation strength of the insulating gas to be tested relative to the SF6 gas;
s16, calculating the greenhouse effect potential of the insulating gas to be detected to obtain the greenhouse effect potential to be detected;
s17, analyzing the insulating gas to be tested according to the electric field change sensitivity coefficient to be tested, the reference electric field change sensitivity coefficient, the relative insulating strength of the insulating gas to be tested relative to the SF6 gas, the greenhouse effect potential value to be tested and the greenhouse effect potential value of the SF6 gas acquired in advance to obtain the feasibility assessment result of the insulating gas of the gas insulating equipment, wherein the insulating gas to be tested replaces the SF6 gas.
Specifically, in step S15, an insulation dielectric breakdown test is performed on the insulating gas to be tested under the slightly non-uniform electric field and the extremely non-uniform electric field, and after several tests, corresponding breakdown voltages are obtained, and the breakdown voltages of the SF6 gas under the slightly non-uniform electric field and the extremely non-uniform electric field are obtained in advance, so as to obtain the relative insulation strength of the insulating gas to be tested with respect to the SF6 gas. In the same other cases, when the insulation strength of the insulating gas to be measured is larger than that of SF6 gas, the insulating gas to be measured having a larger insulation strength is generally selected as the insulating gas for the electrical insulation apparatus.
Specifically, in step S16, the greenhouse potential (GWP) is calculated based on an index of radiation characteristics of the well-mixed greenhouse gas, which is used to measure the radiation compelling of a given unit mass of the well-mixed greenhouse gas in the current atmosphere integrated over a selected time period relative to carbon dioxide, taking into account the environmental friendliness of the gas; it will be understood that the higher the GWP value, the greater the ability to act on the greenhouse effect for the same gas content, i.e. an environmentally friendly insulating gas with a low GWP value is generally selected as the insulating gas for the electrical insulation device for otherwise the same gas content.
Specifically, in step S17, SF6 gas is used as a reference gas, and factors such as electric field variation sensitivity coefficient, relative insulation strength, and greenhouse potential are comprehensively considered, so as to evaluate the feasibility of the insulating gas to be tested as a substitute SF6 gas. It is to be noted that the evaluation of the feasibility is not limited to the above specific factors, but may also include self-healing characteristics, inflation pressure limit values, and the like.
In order to further illustrate the breakdown characteristics of the mixed gas under the extremely uneven electric field, the breakdown voltages of the mixed gas under different proportions and pressures are theoretically analyzed from the dielectric strength calculation angle. The theory of the ebb flow indicates that: when the ratio of the electric field intensity E to the gas molecular density N exceeds a certain value, the gap can be punctured, and the puncture criterion of the Pedersen gas is as follows:
in the formula: ecrFor an extremely non-uniform electric field, the critical breakdown field strength generally needs to be corrected to a certain extent on the basis of the electric field change sensitivity coefficient of the gas. Since the laplace field is a linear field, the electric field intensity E is considered to be proportional to the potential difference, which can cause the critical voltage U of gas breakdownbI.e. the medium recovery strength is:
in the formula: omega is the correction coefficient of the uneven electric field and the uniform electric field, and the value is different under different gases and pressures.
The number of particles per unit volume N has the following relationship with the density of the gas medium:
in the formula: m is other relative molecular mass; ρ is the gas density (kg/m)3)；R0＝6.02×023mol-1It is an Avogastron constant.
Combining formula (2) and formula (3) to obtain:
the formula shows that: u shapebThe value is related to rho/E, and if the gas density is low and the field strength is high, U isbThe lower the value of (b), the lower the dielectric strength of the gas in this region, the more likely dielectric breakdown occurs. For critical breakdown electric field E in sphere-sphere modelcrCan be based on the rate of change of breakdown voltage with pressure knIs obtained, wherein knIndicating the rate of change of the average breakdown field strength with pressure. According to the gas state equation, k isnThe pressure intensity and the molecular number density N are transformed to obtain the breakdown criterion (Ecr/N) of the gases with different mixing ratios.
The density for a gas can be obtained from the gas equation of state:
p＝ZρRgT (5)；
in the formula: p is the static pressure per unit mass, Pa; t is temperature, K; rg is R/M, R is 8.314J/(mol K), which is a general gas constant; m is relative molecular mass which can be calculated by a Chung method;
in addition, Z is a compression factor, and the value of Z is related to pressure and temperature and can be calculated by an R-K equation.
Wherein:
p, T, Pc and Tc in the formula are gas pressure (Pa), temperature (K), critical pressure (Pa) and critical temperature (K), respectively.
By adopting a theoretical analysis method of the above-mentioned flow theory, the influence of the nonuniform coefficient of the electric field is analyzed by selecting 12% C4F7N/CO2 gas under the condition of 0.5 MPa. The breakdown characteristics of the mixed gas under different electric field non-uniform coefficients can be obtained according to the breakdown criterion of the gas, see the gas breakdown characteristics of different electric field non-uniform coefficients shown in fig. 4, and the working condition of the electric field voltage-sharing coefficient can be obtained by changing the curvature radius of the needle, see the electric field distribution and the electric field non-uniform coefficients under different curvature radii shown in fig. 5. As can be seen from fig. 4 and 5, as the radius of curvature decreases, the electric field unevenness coefficient (electric field unevenness) of the pin plate electrode pattern increases, which leads to a gradual decrease in the breakdown voltage of the mixed gas, and when the radius of curvature decreases from 0.15mm to 0.05mm, the breakdown voltage decreases by 14.7 kV/mm. Furthermore, in comparison with the case of 0.2mm in radius of curvature, it can be found that when the electric field nonuniformity factor is less than 4, the breakdown voltage increases almost exponentially, indicating that the gas has a strong sensitivity to the change of the electric field, i.e., a high requirement for the surface roughness of the device.
Compared with the prior art, the embodiment of the invention determines the sensitivity coefficient of the insulating gas to be detected to the electric field change according to each measured breakdown voltage by measuring the breakdown voltage of the insulating gas to be detected under a slightly non-uniform electric field and an extremely non-uniform electric field, and further obtains the sensitivity degree of the insulating gas to be detected to the electric field change according to the sensitivity coefficient of the insulating gas to the electric field change and the pre-obtained sensitivity coefficient of sulfur hexafluoride (SF6) to the electric field change, and analyzes the insulation performance of the insulating gas to be detected.
Referring to fig. 6, fig. 6 is a block diagram of an apparatus for analyzing insulation performance of an insulating gas according to an embodiment of the present invention. The insulation performance analysis apparatus 20 for an insulating gas includes:
the first breakdown voltage measuring module 21 is used for measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain a first breakdown voltage;
the second breakdown voltage measuring module 22 is used for measuring the breakdown voltage of the insulating gas to be measured under the extremely-uneven electric field to obtain a second breakdown voltage;
the sensitivity coefficient calculation module 23 to be measured is configured to calculate a change sensitivity coefficient of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage;
and the insulation performance analysis module 24 is configured to perform insulation performance analysis on the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-obtained reference electric field change sensitivity coefficient.
Specifically, the non-uniform electric field may be classified into a slightly non-uniform electric field and a very non-uniform electric field according to the degree of non-uniformity of the electric field. If the non-uniformity of the electric field is not severe, the gas gap is broken down when the interpolar voltage is high enough to cause self-sustaining discharge of the gas medium, and the electric field is called a slightly non-uniform electric field; if the non-uniformity of the electric field is relatively severe, when the interpolar voltage is high enough to cause self-sustaining discharge of the gas medium, the gas gap is not broken down, only the gas at the higher electric field intensity is subjected to corona discharge, and the gas gap is broken down after the voltage is further increased, which is called a very non-uniform electric field.
Illustratively, there are 5 kinds of insulating gases to be measured, namely, a first insulating gas to be measured (4% C4F7N/CO2), a second insulating gas to be measured (6% C4F7N/CO2), a third insulating gas to be measured (8% C4F7N/CO2), a fourth insulating gas to be measured (10% C4F7N/CO2) and a fifth insulating gas to be measured (12% C4F7N/CO2), the value of the electric field nonuniformity coefficient of the slightly nonuniform electric field is set to be 1.04, the value of the electric field nonuniformity coefficient of the extremely nonuniform electric field is set to be 14.22, the corresponding first breakdown voltage of each insulating gas to be measured under the electric field nonuniformity coefficient of 1.04 is measured under the pressure of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa and 0.6MPa, respectively, and under the same conditions, the corresponding second breakdown voltage of each insulating gas to be measured under the electric field nonuniformity coefficient of 14.04, according to the measured first breakdown voltage and second breakdown voltage, the electric field transformation sensitivity coefficient of each insulating gas to be measured under each pressure is respectively calculated, the calculation result can refer to the sensitivity coefficient of each insulating gas to be measured and the SF6 gas to the electric field change shown in fig. 2 and the sensitivity coefficient broken line graph of each insulating gas to be measured and the SF6 gas to the electric field change shown in fig. 3, and the insulating property of the insulating gas to be measured is analyzed according to fig. 2 and fig. 3.
Compared with the prior art, the insulation performance analysis device for the insulating gas disclosed by the embodiment of the invention obtains the first breakdown voltage and the second breakdown voltage by respectively measuring the breakdown voltages of the insulating gas to be detected under slightly non-uniform electric fields and extremely non-uniform electric fields, and calculates the change sensitivity coefficient of the electric field to be detected according to the first breakdown voltage and the second breakdown voltage; the electric field change sensitivity coefficient to be detected represents the sensitivity degree of the insulating gas to be detected to the electric field change; and then, according to the electric field change sensitivity coefficient to be detected and a pre-obtained reference electric field change sensitivity coefficient, carrying out insulation performance analysis on the insulating gas to be detected. According to the embodiment of the invention, the breakdown voltage of the insulating gas to be detected in a slightly non-uniform electric field and an extremely non-uniform electric field is measured, the sensitivity coefficient of the insulating gas to be detected to the electric field change is determined according to each measured breakdown voltage, and the sensitivity degree of the insulating gas to be detected to the electric field change is obtained according to the coefficient degree of the insulating gas to be detected to the electric field change and the pre-obtained sensitivity coefficient of sulfur hexafluoride (SF6) to the electric field change, so that the insulation performance of the insulating gas to be detected is analyzed.
In an embodiment, the sensitivity coefficient to be measured calculating module 23 is specifically configured to:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
It should be noted that, as the electric field variation sensitivity coefficient of the insulating gas to be measured is larger, the sensitivity of the insulating gas to be measured to the electric field variation (the electric field non-uniform coefficient is larger) is smaller; the smaller the electric field variation sensitivity coefficient of the insulating gas to be measured is, the larger the sensitivity of the insulating gas to be measured to the electric field variation (the larger the electric field nonuniformity coefficient) is.
In one embodiment, referring to fig. 7, the apparatus 20 further includes a reference sensitivity coefficient calculating module 25, referring to fig. 8, where the reference sensitivity coefficient calculating module 25 specifically includes:
a first reference voltage measuring unit 251, configured to measure a breakdown voltage of the SF6 gas under a slightly non-uniform electric field, to obtain a first reference voltage;
a second reference voltage measuring unit 252, configured to measure a breakdown voltage of the SF6 gas under the extremely uneven electric field, to obtain a second reference voltage;
and a reference sensitivity coefficient calculating unit 253, configured to subtract the first reference voltage from the second reference voltage, and divide the first reference voltage by the second reference voltage to obtain a reference electric field variation sensitivity coefficient.
Illustratively, the value of the field nonuniformity coefficient of the slightly nonuniform electric field is set to be 1.04, the value of the field nonuniformity coefficient of the extremely nonuniform electric field is set to be 14.22, a first reference voltage of the SF6 gas under the slightly nonuniform electric field is measured under the pressures of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa and 0.6MPa respectively, a second reference voltage of the SF6 gas under the extremely nonuniform electric field is measured respectively under the same conditions, and the electric field variation sensitivity coefficient of the SF6 gas under each pressure is calculated respectively according to the measured first reference voltage and the measured second reference voltage. As can be seen from FIGS. 2 and 3, the sensitivity coefficient (Es) of the electric field variation of the C4F7N/CO2 mixed gas is smaller than that of SF6 as a whole, which shows that the C4F7N/CO2 mixed gas is more sensitive to the non-uniform coefficient of the electric field. Secondly, as the content of the C4F7N is increased, the Es value is smaller, which shows that the absolute content of the C4F7N has a larger influence on the electric field sensitivity of the mixed gas, and the sensitivity is even stronger than that of the pure SF 6. The influence of the nonuniform coefficient of the electric field on the mixed gas of C4F7N is large, the discharge inhibition effect of C4F7N under the nonuniform electric field is poor, and the higher the content is, the higher the requirement on the roughness of the metal surface in the equipment is.
In one embodiment, referring to fig. 9, the apparatus 20 further comprises:
the insulation dielectric breakdown test module 26 is configured to perform an insulation dielectric breakdown test on the insulation gas to be tested to obtain a relative insulation strength of the insulation gas to be tested with respect to the SF6 gas;
a greenhouse effect potential calculation module 27, configured to perform greenhouse effect potential calculation on the insulating gas to be tested to obtain a greenhouse effect potential to be tested;
and the feasibility evaluation module 28 is configured to analyze the insulating gas to be tested according to the electric field change sensitivity coefficient to be tested, the reference electric field change sensitivity coefficient, the relative insulation strength of the insulating gas to be tested with respect to the SF6 gas, the greenhouse effect potential value to be tested, and the greenhouse effect potential value of the SF6 gas, which is obtained in advance, to obtain a feasibility evaluation result of the insulating gas of the gas insulation device, in which the insulating gas to be tested replaces the SF6 gas.
Specifically, an insulation dielectric breakdown test is performed on the insulating gas to be measured under a slightly non-uniform electric field and an extremely non-uniform electric field, corresponding breakdown voltages are obtained through a plurality of tests, and the breakdown voltages of the SF6 gas under the slightly non-uniform electric field and the extremely non-uniform electric field are obtained in advance, so that the relative insulation strength of the insulating gas to be measured relative to the SF6 gas is obtained. In the same other cases, when the insulation strength of the insulating gas to be measured is larger than that of SF6 gas, the insulating gas to be measured having a larger insulation strength is generally selected as the insulating gas for the electrical insulation apparatus.
Specifically, considering the environmental friendliness of the gas, a greenhouse potential (GWP) is measured based on an index of radiation characteristics of the well-mixed greenhouse gas, and is used to measure the radiation compelling per unit mass of a given well-mixed greenhouse gas in the current atmosphere integrated over a selected time relative to carbon dioxide; it will be understood that the higher the GWP value, the greater the ability to act on the greenhouse effect for the same gas content, i.e. an environmentally friendly insulating gas with a low GWP value is generally selected as the insulating gas for the electrical insulation device for otherwise the same gas content.
Specifically, SF6 gas is used as a reference gas, factors such as electric field change sensitivity coefficient, relative insulation strength and greenhouse effect potential are comprehensively considered, and feasibility of the insulating gas to be tested as a substitute SF6 gas is evaluated. It is to be noted that the evaluation of the feasibility is not limited to the above specific factors, but may also include self-healing characteristics, inflation pressure limit values, and the like.
It should be noted that the working principle of the insulating property analyzing apparatus 20 for insulating gas can refer to the insulating property analyzing method for insulating gas described in any of the above embodiments, and is not described herein again.
Referring to fig. 10, an insulation performance analysis apparatus 30 for an insulation gas according to an embodiment of the present invention includes a processor 31, a memory 32, and a computer program stored in the memory 32 and configured to be executed by the processor 32, where the processor 31, when executing the computer program, implements the steps in the above insulation performance analysis method embodiment, such as the steps S11 to S14 shown in fig. 1; alternatively, the processor 31 may implement the functions of the modules in the above device embodiments when executing the computer program, for example, the first breakdown voltage measurement module 21.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 32 and executed by the processor 31 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the insulating property analyzing apparatus 30 for insulating gas. For example, the computer program may be divided into a first breakdown voltage measurement module 21, a second breakdown voltage measurement module 22, a sensitivity coefficient to be measured calculation module 23, and an insulation performance analysis module 24, where the specific functions of each module are as follows:
the first breakdown voltage measuring module 21 is used for measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain a first breakdown voltage;
the second breakdown voltage measuring module 22 is used for measuring the breakdown voltage of the insulating gas to be measured under the extremely-uneven electric field to obtain a second breakdown voltage;
the sensitivity coefficient calculation module 23 to be measured is configured to calculate a change sensitivity coefficient of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage;
and the insulation performance analysis module 24 is configured to perform insulation performance analysis on the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-obtained reference electric field change sensitivity coefficient.
For the specific working process of each module, reference may be made to the working process of the insulating property analysis apparatus 20 for insulating gas described in the above embodiments, and details are not repeated here.
The insulating property analyzing device 30 of the insulating gas may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The insulation property analyzing apparatus 30 of the insulation gas may include, but is not limited to, a processor 31, a memory 32. It will be understood by those skilled in the art that the schematic diagram is merely an example of the insulation performance analysis apparatus of the insulating gas, and does not constitute a limitation to the insulation performance analysis device 30 of the insulating gas, and may include more or less components than those shown, or combine some components, or different components, for example, the insulation performance analysis device 30 of the insulating gas may further include an input-output device, a network access device, a bus, and the like.
The Processor 31 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 31 is a control center of the insulating gas insulating property analyzing apparatus 30, and various interfaces and lines are used to connect various parts of the entire insulating gas insulating property analyzing apparatus 30.
The memory 32 may be used to store the computer programs and/or modules, and the processor 31 may implement various functions of the insulating property analyzing apparatus 30 for the insulating gas by executing or executing the computer programs and/or modules stored in the memory 32 and calling data stored in the memory 32. The memory 32 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 32 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated module of the insulating property analysis apparatus 30 of the insulating gas may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for analyzing an insulation performance of an insulating gas, comprising:
measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain a first breakdown voltage;
measuring the breakdown voltage of the insulating gas to be detected under the extremely-uneven electric field to obtain a second breakdown voltage;
calculating the change sensitivity coefficient of the electric field to be detected according to the first breakdown voltage and the second breakdown voltage;
and analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient.
2. The method for analyzing the insulation performance of the insulating gas according to claim 1, wherein the calculating the sensitivity coefficient of change of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage specifically comprises:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
3. The insulation property analysis method of an insulation gas according to claim 2, wherein the reference electric field variation sensitivity coefficient is obtained by:
measuring the breakdown voltage of the SF6 gas under a slightly uneven electric field to obtain a first reference voltage;
measuring the breakdown voltage of the SF6 gas under the extremely-uneven electric field to obtain a second reference voltage;
and subtracting the first reference voltage from the second reference voltage, and dividing by the first reference voltage to obtain a reference electric field change sensitivity coefficient.
4. The insulation performance analysis method of an insulation gas according to claim 1, further comprising:
performing an insulation dielectric breakdown test on the insulating gas to be tested to obtain the relative insulation strength of the insulating gas to be tested relative to the SF6 gas;
calculating the greenhouse effect potential value of the insulating gas to be detected to obtain the greenhouse effect potential value to be detected;
and analyzing the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected, the reference electric field change sensitivity coefficient, the relative insulating strength of the insulating gas to be detected relative to the SF6 gas, the greenhouse effect potential value to be detected and the greenhouse effect potential value of the SF6 gas acquired in advance to obtain the feasibility evaluation result of the insulating gas to be detected replacing the SF6 gas and used as the insulating gas of the gas insulating equipment.
5. An apparatus for analyzing the insulation performance of an insulating gas, comprising:
the first breakdown voltage measuring module is used for measuring the breakdown voltage of the insulating gas to be measured under the slightly uneven electric field to obtain first breakdown voltage;
the second breakdown voltage measuring module is used for measuring the breakdown voltage of the insulating gas to be measured under the extremely-uneven electric field to obtain a second breakdown voltage;
the sensitivity coefficient calculation module to be measured is used for calculating the change sensitivity coefficient of the electric field to be measured according to the first breakdown voltage and the second breakdown voltage;
and the insulation performance analysis module is used for analyzing the insulation performance of the insulating gas to be detected according to the electric field change sensitivity coefficient to be detected and a pre-acquired reference electric field change sensitivity coefficient.
6. The apparatus for analyzing insulation properties of an insulating gas according to claim 5, wherein the module for calculating the sensitivity coefficient to be measured is specifically configured to:
and subtracting the first breakdown voltage from the second breakdown voltage, and dividing the first breakdown voltage by the second breakdown voltage to obtain the electric field change sensitivity coefficient to be measured.
7. The apparatus for analyzing insulation performance of an insulating gas according to claim 6, further comprising a reference susceptibility coefficient calculation module, wherein the reference susceptibility coefficient calculation module specifically includes:
the first reference voltage measuring unit is used for measuring the breakdown voltage of the SF6 gas under a slightly nonuniform electric field to obtain a first reference voltage;
the second reference voltage measuring unit is used for measuring the breakdown voltage of the SF6 gas under the extremely-uneven electric field to obtain a second reference voltage;
and the reference sensitive coefficient calculating unit is used for subtracting the first reference voltage from the second reference voltage and dividing the first reference voltage by the second reference voltage to obtain a reference electric field change sensitive coefficient.
8. The apparatus for analyzing the insulation property of an insulating gas according to claim 5, further comprising:
the insulation dielectric breakdown test module is used for carrying out an insulation dielectric breakdown test on the insulation gas to be tested to obtain the relative insulation strength of the insulation gas to be tested relative to the SF6 gas;
the greenhouse effect potential value calculation module is used for calculating the greenhouse effect potential value of the insulating gas to be detected to obtain the greenhouse effect potential value to be detected;
and the feasibility evaluation module is used for analyzing the insulating gas to be tested according to the electric field change sensitivity coefficient to be tested, the reference electric field change sensitivity coefficient, the relative insulating strength of the insulating gas to be tested relative to the SF6 gas, the greenhouse effect potential value to be tested and the greenhouse effect potential value of the SF6 gas acquired in advance to obtain a feasibility evaluation result of the insulating gas to be tested replacing the SF6 gas and used as the insulating gas of the gas insulating equipment.
9. An insulation properties analysis apparatus of an insulating gas, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the insulation properties analysis method of an insulating gas according to any one of claims 1 to 4 when executing the computer program.
10. A storage medium, characterized in that the storage medium comprises a stored computer program, wherein the apparatus in which the storage medium is located is controlled to perform the insulation performance analysis method of an insulating gas according to any one of claims 1 to 4 when the computer program is run.
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