Ternary mixed insulating gas optimal configuration method and device, electronic equipment and medium

Abstract

The invention discloses an optimal configuration method and device for ternary mixed insulating gas, electronic equipment and a medium, which are used for solving the problems that the current research on the ternary mixed insulating gas is still in a starting stage, and a gas mixing method is not systematic and reasonable enough. The method comprises the following steps: acquiring a plurality of environment-friendly insulating gases, and preliminarily selecting a first insulating gas and a second insulating gas which meet a preset gas screening condition from the environment-friendly insulating gases; based on the first insulating gas and the second insulating gas, a preset buffer gas is mixed at the same time to form an initial ternary mixed insulating gas; and performing parameter comparison according to the initial ternary mixed insulating gas and SF6 gas, and performing mixing ratio optimization on the initial ternary mixed insulating gas according to a parameter comparison result to obtain a target ternary mixed insulating gas. Therefore, on the basis of parameter comparison and mixing proportion optimization of the mixed insulating gas, the ternary mixed insulating gas with parameters equivalent to those of SF6 gas under the optimal configuration condition can be finally obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a method, device, electronic equipment and medium for optimizing the configuration of a ternary mixed insulating gas. Background Art

[0002] SF6 (sulfur hexafluoride) is a colorless, odorless, non-toxic gas with very stable chemical properties. SF6 is widely used as an insulating medium and arc extinguishing medium in power systems, especially in high-voltage switchgear. Due to its excellent insulation properties and arc extinguishing ability, SF6 gas has become one of the indispensable materials in power systems.

[0003] With the rapid development of the power industry, the consumption of SF6 gas in high-voltage power equipment is still growing rapidly without a feasible alternative technical solution. The SF6 gas content in the atmosphere is also increasing year by year. SF6 gas has a strong greenhouse effect, so it is urgent to find an environmentally friendly insulating gas that can replace SF6. Researching environmentally friendly insulating SF6 alternative gases has become a difficult problem faced by scientific researchers in the power industry.

[0004] The environmentally friendly insulating gases that are currently being studied include C4F7N (perfluoroisobutyronitrile), C5F 10 O (perfluoro-n-propyl vinyl ether), HFO-1336mzz (E) (trans-1,1,1,4,4,4-hexafluoro-2-butene), CF3I (trifluoroiodomethane), C6F 12 O (perfluorohexanone), HFO-1234ze (E) (CF3CH=CHF, trans-1,3,3,3-tetrafluoropropylene, industrial trans-1,3,3,3-tetrafluoropropylene), c-C4F8 (octafluorocyclobutane), CF3SO2F (trifluoromethylsulfonyl fluoride), etc.

[0005] At present, the research on ternary mixed insulating gas at home and abroad is still in its infancy, and no systematic and reasonable configuration plan for ternary mixed insulating gas has been formed. Summary of the invention

[0006] The present invention provides a method, device, electronic equipment and medium for optimizing the configuration of a ternary mixed insulating gas, which are used to solve or partially solve the technical problem that the current research on ternary mixed insulating gas is still in its infancy and the gas mixing method is not systematic and reasonable enough.

[0007] The present invention provides a method for optimizing the configuration of a ternary mixed insulating gas, the method comprising:

[0008] Obtain a variety of environmentally friendly insulating gases;

[0009] Preliminarily selecting two first insulating gases and a second insulating gas that meet preset gas screening conditions from the multiple environmentally friendly insulating gases;

[0010] Based on the first insulating gas and the second insulating gas, a preset buffer gas is mixed to form an initial ternary mixed insulating gas;

[0011] A parameter comparison is performed between the initial ternary mixed insulating gas and SF6 gas, and based on the parameter comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized to obtain a target ternary mixed insulating gas.

[0012] Optionally, performing parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas includes:

[0013] According to the liquefaction temperature requirement of the ternary mixed insulating gas, respectively calculating the critical gas ratios of the first insulating gas and the second insulating gas in the initial ternary mixed insulating gas;

[0014] Respectively obtaining effective ionization coefficient curves of the first insulating gas, the second insulating gas, and the preset buffer gas, and calculating a mixed effective ionization coefficient curve of the initial ternary mixed insulating gas according to each of the effective ionization coefficient curves;

[0015] Calculating the initial critical reduced field strength of the initial ternary mixed insulating gas under the critical gas ratio condition according to the mixed effective ionization coefficient curve;

[0016] The initial critical reduced field strength is compared with the reference critical reduced field strength of SF6 gas, and according to the field strength comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized based on gas replacement and / or gas ratio adjustment to obtain the target ternary mixed insulating gas.

[0017] Optionally, the optimizing the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment according to the field strength comparison result to obtain the target ternary mixed insulating gas includes:

[0018] If the initial critical reduced field strength is less than the reference critical reduced field strength of SF6 gas, the first insulating gas and / or the second insulating gas is replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a first optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the first optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas;

[0019] If the initial critical reduced field strength is greater than the reference critical reduced field strength of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with priority to obtain a second optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the second optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas;

[0020] When the error between the critical reduced field strength recalculated after the mixing ratio optimization and the reference critical reduced field strength of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0021] Optionally, performing parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas includes:

[0022] Performing a power frequency breakdown test on the initial ternary mixed insulating gas to obtain an initial power frequency breakdown voltage under isobaric conditions with SF6 gas;

[0023] The initial power frequency breakdown voltage is compared with a reference power frequency breakdown voltage of SF6 gas, and according to the voltage comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized based on gas replacement and / or gas ratio adjustment to obtain a target ternary mixed insulating gas.

[0024] Optionally, the step of optimizing the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment according to the voltage comparison result to obtain the target ternary mixed insulating gas includes:

[0025] If the initial power frequency breakdown voltage is less than the reference power frequency breakdown voltage of SF6 gas, the first insulating gas and / or the second insulating gas are replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a third optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the third optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas;

[0026] If the initial power frequency breakdown voltage is greater than the reference power frequency breakdown voltage of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with the priority to obtain a fourth optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the fourth optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas;

[0027] When the error between the power frequency breakdown voltage recalculated after the mixing ratio optimization and the reference power frequency breakdown voltage of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0028] Optionally, the calculating a mixed GWP value of the initial ternary mixed insulating gas, and reducing the gas proportions of the first insulating gas and the second insulating gas in combination with priority based on the mixed GWP value, includes:

[0029] Respectively obtaining the relative molecular mass, single gas ratio and single gas GWP value of the first insulating gas, the second insulating gas and the preset buffer gas;

[0030] Calculating the mixed GWP value of the initial ternary mixed insulating gas according to each of the relative molecular masses, each of the single gas ratios and each of the single gas GWP values;

[0031] Based on the mixed GWP value, respectively calculating partial derivatives of the single gas ratios of the first insulating gas and the second insulating gas to obtain a first partial derivative value of the ratio corresponding to the first insulating gas and a second partial derivative value of the ratio corresponding to the second insulating gas;

[0032] If the first partial derivative of the ratio is smaller than the second partial derivative of the ratio, while reducing the gas ratios of the first insulating gas and the second insulating gas, the gas ratio of the second insulating gas is preferentially reduced;

[0033] If the first partial derivative of the ratio is greater than the second partial derivative of the ratio, the gas ratio of the first insulating gas is preferentially reduced while reducing the gas ratios of the first insulating gas and the second insulating gas.

[0034] Optionally, each of the environmentally friendly insulating gases has its own corresponding liquefaction temperature and insulation strength, and the preset gas screening condition indicates that the liquefaction temperature of the environmentally friendly insulating gas is within a preset temperature range, and the insulation strength is within a preset insulation strength range; the preset buffer gas is CO2 gas, or N2 gas.

[0035] The present invention also provides a ternary mixed insulating gas optimization configuration device, comprising:

[0036] Insulating gas acquisition module, used to obtain a variety of environmentally friendly insulating gases;

[0037] An insulating gas selection module, used for preliminarily selecting two first insulating gases and a second insulating gas that meet preset gas screening conditions from the multiple environmentally friendly insulating gases;

[0038] An insulating gas mixing module, configured to mix the first insulating gas and the second insulating gas with a preset buffer gas to form an initial ternary mixed insulating gas;

[0039] The mixing ratio optimization module is used to perform parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimize the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas.

[0040] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0041] The memory is used to store program code and transmit the program code to the processor;

[0042] The processor is used to execute the ternary mixed insulating gas optimization configuration method as described in any one of the above items according to the instructions in the program code.

[0043] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the ternary mixed insulating gas optimization configuration method as described in any one of the above items.

[0044] It can be seen from the above technical solutions that the present invention has the following advantages:

[0045] A method for optimizing the configuration of a ternary mixed insulating gas is provided. First, a plurality of environmentally friendly insulating gases are obtained, and two first insulating gases and second insulating gases that meet preset gas screening conditions are preliminarily selected; then, based on the first insulating gas and the second insulating gas, a preset buffer gas is mixed at the same time to form an initial ternary mixed insulating gas; finally, a parameter comparison is performed between the initial ternary mixed insulating gas and SF6 gas, and based on the parameter comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized to obtain a target ternary mixed insulating gas. Thus, based on the parameter comparison and the optimization of the mixing ratio of the mixed insulating gas, a ternary mixed insulating gas with parameters equivalent to those of SF6 gas under optimal configuration conditions can be finally obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A flow chart of the steps of a method for optimizing configuration of a ternary mixed insulating gas;

[0048] Figure 2 It is a schematic diagram of the overall process of a ternary mixed insulating gas optimization configuration method;

[0049] Figure 3 The calculation result diagram between the liquefaction temperature constraint of the ternary mixed insulating gas and the critical ratio of each insulating gas in the given example is shown;

[0050] Figure 4 This is a data comparison chart of the power frequency breakdown voltage of the ternary mixed insulating gas in the given example and the SF6 gas under the same conditions;

[0051] Figure 5 The present invention is a structural block diagram of a ternary mixed insulating gas optimization configuration device. DETAILED DESCRIPTION

[0052] The embodiments of the present invention provide a method, device, electronic device and medium for optimizing the configuration of a ternary mixed insulating gas, which are used to solve or partially solve the technical problem that the current research on ternary mixed insulating gas is still in its infancy and the gas mixing method is not systematic and reasonable enough.

[0053] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] As an example, with the rapid development of the power industry, the use of SF6 gas in high-voltage power equipment is still growing rapidly without a feasible alternative technical solution. The SF6 gas content in the atmosphere is also increasing year by year. SF6 gas has a strong greenhouse effect, so it is urgent to find an environmentally friendly insulating gas that can replace SF6. Researching environmentally friendly insulating SF6 alternative gases has become a difficult problem faced by scientific researchers in the power industry.

[0055] The present invention comprehensively analyzes factors such as liquefaction temperature, insulation strength, and GWP (Global Warming Potential) and believes that the most studied ones, such as C4F7N (perfluoroisobutyronitrile), C5F 10 Single environmentally friendly insulating gases such as 1,4-difluoro-2-propyl vinyl ether (1,4-difluoro-2-propyl vinyl ether) and CF3I (1,4-difluoro-2-methyl iodide) cannot directly replace SF6 as environmentally friendly insulating gases. Moreover, under the constraint of the minimum operating temperature of -25°C, their binary mixed insulating gases still cannot replace SF6 gas at the same gas pressure.

[0056] At present, the research on ternary mixed insulating gas at home and abroad is still in its infancy, and no systematic and reasonable configuration plan for ternary mixed insulating gas has been formed.

[0057] Therefore, one of the core invention points of the embodiment of the present invention is: in view of the deficiencies in the prior art, taking into account factors such as insulation strength, liquefaction temperature and GWP value, a reasonable and complete method for optimizing the configuration of ternary mixed insulating gas is provided. By calculating based on parameters such as the liquefaction temperature, GWP value and effective ionization coefficient curve of each gas component, the critical ratio and critical reduced field strength under specific liquefaction temperature requirements are obtained, and the parameters are compared with SF6, or the power frequency breakdown voltage of the ternary mixed insulating gas is obtained in combination with the power frequency breakdown test, and compared with the data of SF6 under the same conditions, and at the same time, combined with the influence of each gas on the GWP value of the ternary mixed insulating gas, the ratio of the ternary mixed insulating gas or the composition is optimized and adjusted, and finally a ternary mixed insulating gas can be obtained whose liquefaction temperature meets the minimum use temperature or other specified liquefaction temperature conditions, whose insulation strength meets the insulation strength equivalent to that of isobaric SF6, and whose GWP value is as low as possible. The method provided by the present invention not only takes into account factors such as the insulation strength, GWP value, and liquefaction temperature of the ternary mixed insulating gas, but also takes into account the composition of the ternary mixed insulating gas, and provides a basis for selecting the composition of the ternary mixed insulating gas and adjustment rules, thereby providing a perfect and complete ternary mixed insulating gas configuration method, and providing a theoretical basis for subsequent research and configuration of the configuration scheme of the ternary mixed insulating gas.

[0058] Reference Figure 1 , shows a flow chart of the steps of a method for optimizing the configuration of a ternary mixed insulating gas provided by an embodiment of the present invention, which may specifically include the following steps:

[0059] Step 101, obtaining a plurality of environmentally friendly insulating gases;

[0060] In the specific implementation, it is necessary to first determine a variety of environmentally friendly insulating gases that can be used for mixing. Environmentally friendly insulating gas refers to a gas with a low GWP value and good insulation performance. It is used to replace the traditional SF6 gas in power equipment. Among them, the environmentally friendly insulating gas involved in the mixing can refer to the selection introduced in the previous background technology, or other available environmentally friendly insulating gases can be used.

[0061] Each environmentally friendly insulating gas has its own corresponding liquefaction temperature and insulation strength. The liquefaction temperature and insulation strength of various environmentally friendly insulating gases can be obtained by looking up relevant literature or manufacturer's factory information.

[0062] Step 102, preliminarily selecting two first insulating gases and second insulating gases that meet preset gas screening conditions from the multiple environmentally friendly insulating gases;

[0063] According to the liquefaction temperature and insulation strength of each environmentally friendly insulating gas, two insulating gases that meet the preset gas screening conditions are preliminarily selected and recorded as gas A (the first insulating gas) and gas B (the second insulating gas).

[0064] The preset gas screening condition referred to in the embodiment of the present invention means that the liquefaction temperature of the environmentally friendly insulating gas is within the preset temperature range (the liquefaction temperature is relatively low), and the insulation strength is within the preset insulation strength range (the insulation strength is relatively strong). It is understandable that the specific temperature range and insulation strength range can be set according to actual conditions, and the present invention does not limit this.

[0065] Step 103, based on the first insulating gas and the second insulating gas, a preset buffer gas is mixed to form an initial ternary mixed insulating gas;

[0066] Based on the selected A gas and B gas, and then mixing a buffer gas (CO2 gas, or N2 gas), an initial ternary mixed insulating gas can be obtained.

[0067] Step 104, performing parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain a target ternary mixed insulating gas.

[0068] Specifically, in the first optional solution, the process of performing parameter comparison between the initial ternary mixed insulating gas and the SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas can be achieved by executing the following sub-steps S01 to S04:

[0069] Step S01: according to the liquefaction temperature requirement of the ternary mixed insulating gas, respectively calculating the critical gas ratios of the first insulating gas and the second insulating gas in the initial ternary mixed insulating gas;

[0070] First, according to the liquefaction temperature requirements of the ternary mixed insulating gas ( It can also be understood as the minimum operating temperature, the unit is K (Kelvin), which is determined according to the specific operating environment conditions). The critical gas ratio of gas A and gas B in the ternary mixed insulating gas is calculated and recorded as and .

[0071] Among them, combining the Clausius-Clapeyron equation and the Troubleton rule, and assuming that the mixed insulating gas obeys the ideal gas law, the critical gas ratio of gas A and gas B in the ternary mixed insulating gas can be obtained: and The calculation formula is as follows:

[0072]

[0073]

[0074] In the formula, and They represent the liquefaction temperatures of gas A and gas B at atmospheric pressure, in K; represents the ideal gas constant, which is ; represents the Trouton constant, which is ; Indicates the gas vapor pressure, according to the ideal gas law and the gas pressure at the time of the set gas configuration and temperature conditions It is calculated and the unit is MPa (megapascal). The calculation formula is as follows:

[0075]

[0076] Step S02: respectively obtaining effective ionization coefficient curves of the first insulating gas, the second insulating gas, and the preset buffer gas, and calculating a mixed effective ionization coefficient curve of the initial ternary mixed insulating gas according to each effective ionization coefficient curve;

[0077] Among them, the effective ionization coefficient curves of each gas component in the ternary mixed insulating gas can be obtained through the Steady-State Townsend Test (SST). Taking N2 as the buffer gas as an example, assuming that the effective ionization coefficient curve functions of A gas, B gas and N2 can be obtained from the SST test respectively , , The effective ionization coefficient curve function of the ternary mixed insulating gas is It can be calculated by the following formula:

[0078]

[0079] In the formula, , and They respectively represent the gas ratios of gas A, gas B and N2 in the ternary mixed insulating gas.

[0080] Step S03: Calculate the initial critical reduced field strength of the initial ternary mixed insulating gas under the critical gas ratio condition according to the mixed effective ionization coefficient curve;

[0081] According to the effective ionization coefficient curve function of the ternary mixed insulating gas , the critical gas ratio can be calculated and Critical Reduced Field Strength of Ternary Mixed Insulating Gas under Conditions Among them, when When That is .

[0082] Step S04: Compare the initial critical reduced field strength with the reference critical reduced field strength of SF6 gas, and according to the field strength comparison result, optimize the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment to obtain the target ternary mixed insulating gas.

[0083] The critical reduced field strength of the ternary mixed insulating gas Critical reduced field strength of SF6 gas Make a comparison.

[0084] If the critical reduced field strength of the ternary mixed insulating gas Less than the critical reduced field strength of SF6 gas , then replace gas A and / or gas B with insulating gas that meets the preset replacement conditions.

[0085] Among them, the preset replacement condition can be specifically expressed as a lower liquefaction temperature and equivalent insulation strength, or, equivalent liquefaction temperature and stronger insulation strength, or, a lower liquefaction temperature and stronger insulation strength. Among them, technical personnel in this field can select the gas replacement condition according to actual conditions. Environmentally friendly insulating gases with lower liquefaction temperatures and stronger insulation strength can be given priority. When replacing gases, you can choose to replace only one of the environmentally friendly insulating gases, such as only replacing gas A or only replacing gas B, or you can choose to replace both gas A and gas B at the same time.

[0086] In a specific implementation, if the initial critical reduced field strength is less than the reference critical reduced field strength of SF6 gas, the first insulating gas and / or the second insulating gas is replaced with an environmentally friendly insulating gas that meets preset replacement conditions to obtain a first optimized mixed insulating gas, and then the critical reduced field strength is recalculated based on the first optimized mixed insulating gas and re-compared with the reference critical reduced field strength of SF6 gas.

[0087] If the critical reduced field strength of the ternary mixed insulating gas Greater than the critical reduced field strength of SF6 gas , by deriving the GWP value calculation formula of the ternary mixed insulating gas, the gas proportion of the insulating gas (gas A or gas B) that has a better effect on reducing the GWP value of the mixed gas can be appropriately reduced.

[0088] In a specific implementation, if the initial critical reduced field strength is greater than the reference critical reduced field strength of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in priority to obtain a second optimized mixed insulating gas. Then, the critical reduced field strength is recalculated based on the second optimized mixed insulating gas and re-compared with the reference critical reduced field strength of SF6 gas.

[0089] More specifically, the process of calculating the mixed GWP value of the initial ternary mixed insulating gas and reducing the gas proportions of the first insulating gas and the second insulating gas in combination with priority based on the mixed GWP value may mainly include the following sub-steps S21 to S23:

[0090] Step S21: respectively obtaining the relative molecular mass, single gas ratio and single gas GWP value of the first insulating gas, the second insulating gas and the preset buffer gas;

[0091] Step S22: Calculate the mixed GWP value of the initial ternary mixed insulating gas according to the relative molecular mass, the single gas ratio and the single gas GWP value;

[0092] The mixed GWP value of the ternary mixed insulating gas is calculated by the GWP value and ratio of each gas component. The calculation formula is as follows:

[0093]

[0094] In the formula, Indicates the mixed GWP value of the ternary mixed insulating gas; , and They represent the mass fractions of gas A, gas B and N2 in the ternary mixed insulating gas respectively; , and They respectively represent the GWP values ​​of gas A, gas B and N2 in the ternary mixed insulating gas.

[0095] Among them, the mass fraction of each gas component is calculated by the relative molecular mass of each gas molecule and the gas ratio. Therefore, the mixed GWP value of the ternary mixed insulating gas can be calculated by the following formula:

[0096]

[0097] In the formula, , and They represent the relative molecular masses of gas A, gas B and N2 in the ternary mixed insulating gas respectively; , and They respectively represent the gas ratios (volume fractions) of gas A, gas B and N2 in the ternary mixed insulating gas.

[0098] Step S23: based on the mixed GWP value, respectively calculating partial derivatives of the single gas ratios of the first insulating gas and the second insulating gas to obtain a first partial derivative value of the ratio corresponding to the first insulating gas and a second partial derivative value of the ratio corresponding to the second insulating gas;

[0099] The effect on the mixed GWP value is better. The mixed GWP value calculation formula of the ternary mixed insulating gas is used to calculate the partial derivative of the proportion of each gas component, and then the size of the partial derivative is compared.

[0100] This process mainly compares the effects of gas A and gas B. The calculation formula is as follows:

[0101]

[0102]

[0103] If the first partial derivative Less than the second partial derivative , when the percentage reduction is the same, the reduction in the percentage of gas B has a greater impact on the mixed GWP value of the ternary mixed insulating gas, and the mixed GWP value decreases more. When reducing the gas percentages of gas A and gas B, the gas percentage of gas B should be appropriately reduced. Or, based on the priority, the gas ratio can be adjusted by keeping the gas percentage of gas A unchanged and only appropriately reducing the gas percentage of gas B.

[0104] Similarly, if the first partial derivative Greater than the second partial derivative , when the percentage reduction is the same, the reduction in the percentage of gas A has a greater impact on the mixed GWP value of the ternary mixed insulating gas, and the mixed GWP value decreases more. When reducing the gas percentages of gas A and gas B, the gas percentage of gas A should be appropriately reduced. Or, based on the priority, the gas ratio can be adjusted by keeping the gas percentage of gas B unchanged and only appropriately reducing the gas percentage of gas A.

[0105] Repeat the previous related calculation and parameter comparison steps until the insulation strength of the optimized ternary mixed insulating gas is equivalent to that of SF6 gas (that is, the critical reduced field strength of the ternary mixed insulating gas is obtained after the last optimization). Equal to or slightly greater than the critical reduced field strength of SF6 gas ). The ternary mixed insulating gas obtained at this time is the liquefaction temperature requirement Under the conditions of , the optimal configuration scheme of ternary mixed insulating gas with insulation strength equivalent to SF6 gas and relatively lowest GWP value is proposed.

[0106] In a specific implementation, when the error between the critical reduced field strength recalculated after the mixing ratio optimization and the reference critical reduced field strength of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0107] In the second optional scheme, the process of performing parameter comparison between the initial ternary mixed insulating gas and the SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas can be achieved by executing the following sub-steps S11 to S12:

[0108] Step S11: performing a power frequency breakdown test on the initial ternary mixed insulating gas to obtain an initial power frequency breakdown voltage under isobaric conditions with SF6 gas;

[0109] Through the power frequency breakdown test of the ternary mixed insulating gas, the power frequency breakdown voltage of SF6 gas under isobaric conditions can be obtained. .

[0110] Step S12: compare the initial power frequency breakdown voltage with the reference power frequency breakdown voltage of SF6 gas, and optimize the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment according to the voltage comparison result to obtain the target ternary mixed insulating gas.

[0111] The power frequency breakdown voltage of the ternary mixed insulating gas Reference power frequency breakdown voltage of SF6 gas Make a comparison.

[0112] If the power frequency breakdown voltage of the ternary mixed insulating gas Less than the reference power frequency breakdown voltage , then replace gas A and / or gas B with insulating gas that meets the preset replacement conditions.

[0113] Among them, the preset replacement condition can be specifically expressed as a lower liquefaction temperature and equivalent insulation strength, or, equivalent liquefaction temperature and stronger insulation strength, or, a lower liquefaction temperature and stronger insulation strength. Among them, technical personnel in this field can select the gas replacement condition according to actual conditions. Environmentally friendly insulating gases with lower liquefaction temperatures and stronger insulation strength can be given priority. When replacing gases, you can choose to replace only one of the environmentally friendly insulating gases, such as only replacing gas A or only replacing gas B, or you can choose to replace both gas A and gas B at the same time.

[0114] In a specific implementation, if the initial power frequency breakdown voltage is less than the reference power frequency breakdown voltage of SF6 gas, the first insulating gas and / or the second insulating gas is replaced with an environmentally friendly insulating gas that meets preset replacement conditions to obtain a third optimized mixed insulating gas. Then, the power frequency breakdown voltage is recalculated based on the third optimized mixed insulating gas and re-compared with the reference power frequency breakdown voltage of SF6 gas.

[0115] If the power frequency breakdown voltage of the ternary mixed insulating gas Less than the reference power frequency breakdown voltage , by deriving the GWP value calculation formula of the ternary mixed insulating gas, the gas proportion of the insulating gas (gas A or gas B) that has a better effect on reducing the GWP value of the mixed gas can be appropriately reduced.

[0116] In a specific implementation, if the initial power frequency breakdown voltage is greater than the reference power frequency breakdown voltage of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with the priority to obtain a fourth optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the fourth optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas. Among them, the process of calculating the mixed GWP value of the initial ternary mixed insulating gas and reducing the gas proportions of the first insulating gas and the second insulating gas in combination with the priority based on the mixed GWP value can be performed with reference to sub-steps S21 to S23, which will not be repeated here.

[0117] Repeat the previous related calculation and parameter comparison steps until the power frequency breakdown voltage of the optimized ternary mixed insulating gas is Reference power frequency breakdown voltage of SF6 gas Equivalent (i.e., the power frequency breakdown voltage of the ternary mixed insulating gas obtained after the last optimization) Equal to or slightly greater than the reference power frequency breakdown voltage of SF6 gas ), which means that the insulation strength of the optimized ternary mixed insulating gas is equivalent to that of SF6 gas. The ternary mixed insulating gas obtained at this time is the liquefaction temperature requirement Under the conditions of , the optimal configuration scheme of ternary mixed insulating gas with insulation strength equivalent to SF6 gas and relatively lowest GWP value is proposed.

[0118] In a specific implementation, when the error between the power frequency breakdown voltage recalculated after the mixing ratio optimization and the reference power frequency breakdown voltage of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0119] It should be pointed out that in practical applications, when optimizing the mixing ratio of the mixed insulating gas, technicians in this field can arbitrarily choose one of the critical reduced field strength or power frequency breakdown voltage optimization schemes according to actual needs, thereby increasing the flexibility of selecting the optimization configuration scheme for the mixed insulating gas. For example, under conditions where the gas is scarce, such as a small amount of synthesis, in order to achieve the purpose of obtaining the optimized configuration result with a small amount of gas, the critical reduced field strength optimization scheme can be selected. However, this method has higher requirements for the experimental platform. When the amount of gas is sufficient, the power frequency breakdown voltage optimization scheme is preferred. The power frequency breakdown voltage optimization scheme has relatively low requirements for the experimental platform, but it consumes more gas. The gas consumption of the power frequency breakdown voltage optimization scheme is usually more than 1000 times that of the critical reduced field strength optimization scheme. It is understandable that the present invention is not limited to this.

[0120] In the embodiment of the present invention, factors such as insulation strength, liquefaction temperature and GWP value are considered at the same time, and a reasonable and complete optimization configuration method for ternary mixed insulating gas is provided. By calculating based on parameters such as the liquefaction temperature, GWP value and effective ionization coefficient curve of each gas component, the critical ratio and critical reduced field strength under specific liquefaction temperature requirements are obtained, and the parameters are compared with SF6, or the power frequency breakdown voltage of the ternary mixed insulating gas is obtained in combination with the power frequency breakdown test, and compared with the data of SF6 under the same conditions, and at the same time, the influence of each gas on the GWP value of the ternary mixed insulating gas is combined to optimize the ratio or composition of the ternary mixed insulating gas, and finally a ternary mixed insulating gas can be obtained whose liquefaction temperature meets the minimum use temperature or other specified liquefaction temperature conditions, whose insulation strength meets the insulation strength equivalent to that of isobaric SF6, and whose GWP value is as low as possible. The method provided in the embodiment of the present invention not only takes into account factors such as the insulation strength, GWP value, and liquefaction temperature of the ternary mixed insulating gas, but also takes into account the composition of the ternary mixed insulating gas, and provides a basis for selecting the composition of the ternary mixed insulating gas and adjustment rules, thereby providing a perfect and complete ternary mixed insulating gas configuration method, and providing a theoretical basis for subsequent research and configuration of ternary mixed insulating gas configuration schemes.

[0121] For better explanation, refer to Figure 2, showing a schematic diagram of the overall process of a ternary mixed insulating gas optimization configuration method provided by an embodiment of the present invention. It should be pointed out that this embodiment only briefly describes the general process of ternary mixed insulating gas optimization configuration, and the specific implementation process of each step can be understood by referring to the relevant content in the aforementioned embodiment, which will not be repeated here. Figure 2 The various parameters and specific calculation formulas involved in the above embodiments can also refer to the relevant contents in the above embodiments. It can be understood that the present invention is not limited to this.

[0122] First, two insulating gases with lower liquefaction temperature and stronger insulation strength are preliminarily selected from a variety of environmentally friendly insulating gases, which are denoted as gas A and gas B;

[0123] Gas A, gas B and buffer gas N2 or CO2 are mixed to obtain a preliminary gas composition, i.e., a ternary mixed gas A / B / N2 or A / B / CO2;

[0124] Under the liquefaction temperature requirement of the ternary mixed gas, combined with the gas pressure and temperature conditions when setting the gas configuration, calculate the ternary mixed gas ratio under the liquefaction temperature limit (i.e. the critical ratio of gas A and the critical ratio of gas B);

[0125] According to the effective ionization coefficient curve of each gas in the ternary mixed gas, the effective ionization coefficient curve function of the ternary mixed gas is calculated, and the critical reduced field strength is further calculated; or, the power frequency breakdown test is directly performed on the ternary mixed gas under the critical ratio condition to obtain the power frequency breakdown voltage;

[0126] Determine whether the calculated critical reduced field strength is greater than the critical reduced field strength of SF6, or determine whether the calculated power frequency breakdown voltage is greater than the power frequency breakdown voltage of SF6;

[0127] If not, then first consider replacing gas A or gas B (or replacing gas A and gas B at the same time) with an insulating gas with a lower liquefaction temperature and stronger insulation strength, and secondly consider replacing gas A or gas B (or replacing gas A and gas B at the same time) with an insulating gas with a lower liquefaction temperature and equivalent insulation strength, or, with an insulating gas with equivalent liquefaction temperature and stronger insulation strength; based on the optimized ternary mixed gas, recalculate the critical reduced field strength, or recalculate the power frequency breakdown voltage, and compare the parameters with SF6;

[0128] If yes, calculate the mixed GWP value of the ternary mixed gas, compare the effects of gas A and gas B on the mixed GWP value, and according to the comparison results of the effects, appropriately reduce the proportion of gas A, or appropriately reduce the proportion of gas B; based on the optimized ternary mixed gas, recalculate the critical reduced field strength, or recalculate the power frequency breakdown voltage, and compare the parameters with SF6;

[0129] When the calculated critical reduced field strength is equal to or slightly greater than the critical reduced field strength of SF6, or the calculated power frequency breakdown voltage is equal to or slightly greater than the power frequency breakdown voltage of SF6, the optimal configuration scheme of A / B / N2 or A / B / CO2 is output.

[0130] For ease of understanding, the embodiment of the present invention is described below by using a specific example.

[0131] Take A / B / CO2 ternary mixed insulating gas as an example. Figure 3 This is a diagram showing the calculation results between the liquefaction temperature constraint of the A / B / CO2 ternary mixed insulating gas and the critical ratio of each insulating gas. Figure 4 This is a data comparison chart of the power frequency breakdown voltage of A / B / CO2 ternary mixed insulating gas and SF6 gas under the same conditions.

[0132] Combination Figure 3 , Figure 4 , under atmospheric pressure, the liquefaction temperature of gas A is -22°C, and the liquefaction temperature of gas B is -4.7°C. Through calculation, it is found that under the constraint of the minimum operating temperature of -25°C (that is, the liquefaction temperature of the ternary mixed insulating gas is -25°C), when the configured ternary mixed insulating gas is at a temperature of -25°C and a pressure of 0.5MPa, the proportion of gas A in the ternary mixed insulating gas should not be higher than 20.88%, and the proportion of gas B should not be higher than 10.24%.

[0133] At the same time, this example also conducted a power frequency breakdown test of the ternary mixed insulating gas under critical proportions. It can be obtained that the insulation strength of 20%A / 10%B / 70%CO2 is 1.12 times that of SF6 under the same conditions. Then the gas ratio is adjusted. Assuming that the proportion of gas A remains unchanged and only the proportion of gas B is reduced, the power frequency breakdown test is performed again, and the insulation strength of 20%A / 8%B / 72%CO2 is 1.07 times that of SF6 under the same conditions. Furthermore, the insulation strength of 20%A / 6%B / 74%CO2 is 0.97 times that of SF6 under the same conditions. By calculation, it can be obtained that the GWP value of 20%A / 8%B / 72%CO2 is 1890.92, which is lower than the GWP value of each insulating gas component alone, and is about 7.91% of SF6 gas. It can be concluded that the optimal ratio of A / B / CO2 ternary mixed insulating gas that can achieve the insulation strength of SF6 at a liquefaction temperature of -25°C is 20%A / 8%B / 72%CO2.

[0134] Reference Figure 5 , shows a structural block diagram of a ternary mixed insulating gas optimization configuration device provided by an embodiment of the present invention, which may specifically include:

[0135] The insulating gas acquisition module 501 is used to acquire a variety of environmentally friendly insulating gases;

[0136] An insulating gas selection module 502 is used to preliminarily select two first insulating gases and a second insulating gas that meet preset gas screening conditions from the multiple environmentally friendly insulating gases;

[0137] An insulating gas mixing module 503, configured to mix the first insulating gas and the second insulating gas with a preset buffer gas to form an initial ternary mixed insulating gas;

[0138] The mixing ratio optimization module 504 is used to perform parameter comparison between the initial ternary mixed insulating gas and the SF6 gas, and optimize the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas.

[0139] In an optional embodiment, the mixing ratio optimization module 504 includes:

[0140] A gas critical ratio calculation module, used to calculate the gas critical ratios of the first insulating gas and the second insulating gas in the initial ternary mixed insulating gas according to the liquefaction temperature requirement of the ternary mixed insulating gas;

[0141] A mixed effective ionization coefficient curve calculation module, used to respectively obtain the effective ionization coefficient curves of the first insulating gas, the second insulating gas, and the preset buffer gas, and calculate the mixed effective ionization coefficient curve of the initial ternary mixed insulating gas according to each of the effective ionization coefficient curves;

[0142] An initial critical reduced field strength calculation module, used to calculate the initial critical reduced field strength of the initial ternary mixed insulating gas under the gas critical ratio condition according to the mixed effective ionization coefficient curve;

[0143] The first module of mixing ratio optimization is used to compare the initial critical reduced field strength with the reference critical reduced field strength of SF6 gas, and according to the field strength comparison result, optimize the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment to obtain the target ternary mixed insulating gas.

[0144] In an optional embodiment, the first module for optimizing the mixing ratio is specifically used for:

[0145] If the initial critical reduced field strength is less than the reference critical reduced field strength of SF6 gas, the first insulating gas and / or the second insulating gas is replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a first optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the first optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas;

[0146] If the initial critical reduced field strength is greater than the reference critical reduced field strength of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with priority to obtain a second optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the second optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas;

[0147] When the error between the critical reduced field strength recalculated after the mixing ratio optimization and the reference critical reduced field strength of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0148] In an optional embodiment, the mixing ratio optimization module 504 includes:

[0149] A power frequency breakdown test module, used to perform a power frequency breakdown test on the initial ternary mixed insulating gas to obtain an initial power frequency breakdown voltage under isobaric conditions with SF6 gas;

[0150] The second module of mixing ratio optimization is used to compare the initial power frequency breakdown voltage with the reference power frequency breakdown voltage of SF6 gas, and according to the voltage comparison result, optimize the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment to obtain the target ternary mixed insulating gas.

[0151] In an optional embodiment, the second module for optimizing the mixing ratio is specifically used for:

[0152] If the initial power frequency breakdown voltage is less than the reference power frequency breakdown voltage of SF6 gas, the first insulating gas and / or the second insulating gas are replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a third optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the third optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas;

[0153] If the initial power frequency breakdown voltage is greater than the reference power frequency breakdown voltage of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with the priority to obtain a fourth optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the fourth optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas;

[0154] When the error between the power frequency breakdown voltage recalculated after the mixing ratio optimization and the reference power frequency breakdown voltage of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

[0155] In an optional embodiment, the first module for optimizing the mixing ratio and the second module for optimizing the mixing ratio both include:

[0156] A gas parameter acquisition module, used to respectively acquire the relative molecular mass, single gas ratio and single gas GWP value of the first insulating gas, the second insulating gas and the preset buffer gas;

[0157] A mixed GWP value calculation module, used to calculate the mixed GWP value of the initial ternary mixed insulating gas according to each of the relative molecular masses, each of the single gas ratios and each of the single gas GWP values;

[0158] A partial derivative solving module, configured to respectively calculate partial derivatives of the single gas ratios of the first insulating gas and the second insulating gas based on the mixed GWP value, to obtain a first partial derivative value of the proportion corresponding to the first insulating gas and a second partial derivative value of the proportion corresponding to the second insulating gas;

[0159] A first processing module for preferentially reducing the gas proportion is configured to preferentially reduce the gas proportion of the second insulating gas while reducing the gas proportions of the first insulating gas and the second insulating gas when the first proportion partial derivative is less than the second proportion partial derivative;

[0160] The second processing module for preferentially reducing the gas proportion is used to preferentially reduce the gas proportion of the first insulating gas while reducing the gas proportions of the first insulating gas and the second insulating gas when the first proportion partial derivative value is greater than the second proportion partial derivative value.

[0161] In an optional embodiment, each of the environmentally friendly insulating gases has its own corresponding liquefaction temperature and insulation strength, and the preset gas screening condition indicates that the liquefaction temperature of the environmentally friendly insulating gas is within a preset temperature range, and the insulation strength is within a preset insulation strength range; the preset buffer gas is CO2 gas, or N2 gas.

[0162] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the aforementioned method embodiment.

[0163] It should be noted that, in order to enable those skilled in the art to better distinguish data of the same type but with different actual meanings, the embodiments of the present invention use terms such as first and second to distinguish and explain some technical features. The terms such as first and second are only used to distinguish data and have no other special meanings. It can be understood that the present invention is not limited to this.

[0164] An embodiment of the present invention further provides an electronic device, the device comprising a processor and a memory:

[0165] The memory is used to store the program code and transmit the program code to the processor;

[0166] The processor is used to execute the ternary mixed insulating gas optimization configuration method of any embodiment of the present invention according to the instructions in the program code.

[0167] An embodiment of the present invention further provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the ternary mixed insulating gas optimization configuration method of any embodiment of the present invention.

[0168] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0169] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0170] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0171] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0172] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0173] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing the configuration of a ternary mixed insulating gas, characterized in that: include: Obtain a variety of environmentally friendly insulating gases; Preliminarily selecting two first insulating gases and a second insulating gas that meet preset gas screening conditions from the multiple environmentally friendly insulating gases; Based on the first insulating gas and the second insulating gas, a preset buffer gas is mixed to form an initial ternary mixed insulating gas; A parameter comparison is performed between the initial ternary mixed insulating gas and SF6 gas, and based on the parameter comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized to obtain a target ternary mixed insulating gas.

2. The method for optimizing the configuration of a ternary mixed insulating gas according to claim 1, characterized in that: The method of performing parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas includes: According to the liquefaction temperature requirement of the ternary mixed insulating gas, respectively calculating the critical gas ratios of the first insulating gas and the second insulating gas in the initial ternary mixed insulating gas; Respectively obtaining effective ionization coefficient curves of the first insulating gas, the second insulating gas, and the preset buffer gas, and calculating a mixed effective ionization coefficient curve of the initial ternary mixed insulating gas according to each of the effective ionization coefficient curves; Calculating the initial critical reduced field strength of the initial ternary mixed insulating gas under the critical gas ratio condition according to the mixed effective ionization coefficient curve; The initial critical reduced field strength is compared with the reference critical reduced field strength of SF6 gas, and according to the field strength comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized based on gas replacement and / or gas ratio adjustment to obtain the target ternary mixed insulating gas.

3. The method for optimizing the configuration of a ternary mixed insulating gas according to claim 2, characterized in that: The method of optimizing the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment according to the field strength comparison result to obtain the target ternary mixed insulating gas includes: If the initial critical reduced field strength is less than the reference critical reduced field strength of SF6 gas, the first insulating gas and / or the second insulating gas is replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a first optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the first optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas; If the initial critical reduced field strength is greater than the reference critical reduced field strength of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with priority to obtain a second optimized mixed insulating gas, and the critical reduced field strength is recalculated based on the second optimized mixed insulating gas, and re-compared with the reference critical reduced field strength of SF6 gas; When the error between the critical reduced field strength recalculated after the mixing ratio optimization and the reference critical reduced field strength of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

4. The method for optimizing the configuration of a ternary mixed insulating gas according to claim 1, characterized in that: The method of performing parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimizing the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas includes: Performing a power frequency breakdown test on the initial ternary mixed insulating gas to obtain an initial power frequency breakdown voltage under isobaric conditions with SF6 gas; The initial power frequency breakdown voltage is compared with a reference power frequency breakdown voltage of SF6 gas, and according to the voltage comparison result, the mixing ratio of the initial ternary mixed insulating gas is optimized based on gas replacement and / or gas ratio adjustment to obtain a target ternary mixed insulating gas.

5. The method for optimizing the configuration of the ternary mixed insulating gas according to claim 4, characterized in that: The method of optimizing the mixing ratio of the initial ternary mixed insulating gas based on gas replacement and / or gas ratio adjustment according to the voltage comparison result to obtain the target ternary mixed insulating gas includes: If the initial power frequency breakdown voltage is less than the reference power frequency breakdown voltage of SF6 gas, the first insulating gas and / or the second insulating gas are replaced with an environmentally friendly insulating gas that meets the preset replacement conditions to obtain a third optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the third optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas; If the initial power frequency breakdown voltage is greater than the reference power frequency breakdown voltage of SF6 gas, the mixed GWP value of the initial ternary mixed insulating gas is calculated, and based on the mixed GWP value, the gas proportions of the first insulating gas and the second insulating gas are reduced in combination with the priority to obtain a fourth optimized mixed insulating gas, and the power frequency breakdown voltage is recalculated based on the fourth optimized mixed insulating gas, and re-compared with the reference power frequency breakdown voltage of SF6 gas; When the error between the power frequency breakdown voltage recalculated after the mixing ratio optimization and the reference power frequency breakdown voltage of SF6 gas is within the allowable error range, the ternary mixed insulating gas obtained after the last mixing ratio optimization is used as the target ternary mixed insulating gas.

6. The method for optimizing the configuration of a ternary mixed insulating gas according to claim 3 or 5, characterized in that: The calculating the mixed GWP value of the initial ternary mixed insulating gas, and reducing the gas proportions of the first insulating gas and the second insulating gas in combination with the priority based on the mixed GWP value, includes: Respectively obtaining the relative molecular mass, single gas ratio and single gas GWP value of the first insulating gas, the second insulating gas and the preset buffer gas; Calculating the mixed GWP value of the initial ternary mixed insulating gas according to each of the relative molecular masses, each of the single gas ratios and each of the single gas GWP values; Based on the mixed GWP value, respectively calculating partial derivatives of the single gas ratios of the first insulating gas and the second insulating gas to obtain a first partial derivative value of the ratio corresponding to the first insulating gas and a second partial derivative value of the ratio corresponding to the second insulating gas; If the first partial derivative of the ratio is smaller than the second partial derivative of the ratio, while reducing the gas ratios of the first insulating gas and the second insulating gas, the gas ratio of the second insulating gas is preferentially reduced; If the first partial derivative of the ratio is greater than the second partial derivative of the ratio, the gas ratio of the first insulating gas is preferentially reduced while reducing the gas ratios of the first insulating gas and the second insulating gas.

7. The method for optimizing the configuration of a ternary mixed insulating gas according to claim 1, characterized in that: Each of the environmentally friendly insulating gases has its own corresponding liquefaction temperature and insulation strength. The preset gas screening condition indicates that the liquefaction temperature of the environmentally friendly insulating gas is within the preset temperature range, and the insulation strength is within the preset insulation strength range; the preset buffer gas is CO2 gas, or N2 gas.

8. A ternary mixed insulating gas optimization configuration device, characterized in that: include: Insulating gas acquisition module, used to obtain a variety of environmentally friendly insulating gases; An insulating gas selection module, used for preliminarily selecting two first insulating gases and a second insulating gas that meet preset gas screening conditions from the multiple environmentally friendly insulating gases; An insulating gas mixing module, configured to mix the first insulating gas and the second insulating gas with a preset buffer gas to form an initial ternary mixed insulating gas; The mixing ratio optimization module is used to perform parameter comparison between the initial ternary mixed insulating gas and SF6 gas, and optimize the mixing ratio of the initial ternary mixed insulating gas according to the parameter comparison result to obtain the target ternary mixed insulating gas.

9. An electronic device, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the ternary mixed insulating gas optimization configuration method according to any one of claims 1-7 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the ternary mixed insulating gas optimization configuration method according to any one of claims 1 to 7.

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