Method, device and equipment for determining multi-sulfur protection concentration of transformer by passivating agent

Abstract

The invention discloses a method, a device and equipment for determining the multi-sulfur protection concentration of a passivator on a transformer, relates to the technical field of transformer insulation protection, and can solve the technical problem that the protection concentration of the passivator on multi-sulfur corrosion is not determined. Comprising the following steps: constructing a composite model composed of an oil-sulfur model, an insulation paper model and a copper model; passivating agents with different mass fractions are added into the composite model, simulation conditions are set, preset evaluation parameters are determined, analog simulation calculation is conducted on the composite model added with the passivating agents, and preset evaluation parameter values corresponding to the different mass fractions are obtained; and according to the preset evaluation parameter value and the evaluation rule, determining the optimal target mass fraction of the passivating agent on the multiple sulfur protection of the transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer insulation protection, and in particular to a method, device and equipment for determining the multi-sulfur protection concentration of a transformer by a passivating agent. Background Art

[0002] Large oil-immersed power transformers are the core of energy conversion in the power transmission and distribution process of the power grid. The aging of transformer insulation will affect the safe and stable operation of the power grid. In recent years, the failure of transformer oil-paper insulation caused by multiple sulfur corrosion has been very prominent. Most of the operating transformers in my country have added passivators, but the protective concentration of passivators against multiple sulfur corrosion is still uncertain. Therefore, it is urgent to determine the concentration of passivators for multiple sulfur protection of transformers. Summary of the invention

[0003] In view of this, the present invention provides a method, device and equipment for determining the protective concentration of a passivator for transformer multiple sulfur corrosion, which can solve the technical problem that the protective concentration of a passivator for multiple sulfur corrosion is still uncertain.

[0004] According to a first aspect of the present invention, a method for determining a multi-sulfur protection concentration of a passivator for a transformer is provided, the method comprising:

[0005] Construct a composite model consisting of an oil-sulfur model, an insulating paper model, and a copper model;

[0006] Adding passivators of different mass fractions to the composite model, setting simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model to which the passivators are added to obtain preset evaluation parameter values ​​corresponding to the different mass fractions;

[0007] The optimal target mass score of the passivator for transformer multi-sulfur protection is determined according to the preset evaluation parameter value and the evaluation rule.

[0008] Preferably, before constructing the composite model consisting of the oil-sulfur model, the insulating paper model and the copper model, the method further comprises:

[0009] Determining multiple sulfides, insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil, and constructing an oil-sulfur model according to the multiple sulfides, the insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil;

[0010] Establishing an amorphous region according to the repeating unit, setting the degree of polymerization of the cellulose chain, determining the density of cellulose molecules according to the density of the insulating paper, and constructing an insulating paper model according to the amorphous region, the degree of polymerization and the density of cellulose molecules;

[0011] The stacking method, lattice parameters and the number of copper unit cells are determined, and a copper model is constructed according to the stacking method, the lattice parameters and the number of copper unit cells.

[0012] Preferably, the construction of a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model comprises:

[0013] Setting the positional relationship and thickness ratio of the oil-sulfur model, the insulating paper model and the copper model;

[0014] A composite model is constructed according to the positional relationship and the thickness ratio, so as to simulate the actual internal insulation of the transformer by using the composite model.

[0015] Preferably, the setting of simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model to which the passivating agent is added to obtain preset evaluation parameter values ​​corresponding to different mass fractions include:

[0016] Setting simulation conditions, wherein the simulation conditions include: force field, temperature, pressure, a first preset duration of the relaxation process under a constant temperature and constant pressure ensemble, and a second preset duration of the reaction molecular dynamics simulation calculation under a canonical ensemble;

[0017] Determine preset evaluation parameters, and perform geometric optimization on the composite model to which the passivating agent is added to determine the stable configuration of the molecule;

[0018] Under the constant temperature and constant pressure ensemble, relaxation calculations of the first preset time length are performed, and under the canonical ensemble, reaction molecular dynamics simulation calculations of the second preset time length are performed to obtain preset evaluation parameter values ​​corresponding to different mass fractions.

[0019] Preferably, determining the optimal target mass fraction of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule includes:

[0020] Determine the evaluation rule as follows: the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest;

[0021] Determine a target preset evaluation parameter value that satisfies the evaluation rule among the preset evaluation parameter values, and determine the mass score corresponding to the target preset evaluation parameter value as the optimal target mass score for the passivator to the transformer multiple sulfur protection.

[0022] Preferably, the determining of preset evaluation parameters includes:

[0023] The preset evaluation parameter is determined to be at least one of van der Waals energy, elastic modulus, and the number of hydrogen bonds.

[0024] According to a second aspect of the present invention, there is provided a device for determining a multi-sulfur protection concentration of a passivating agent for a transformer, the device comprising:

[0025] A first building module is used to build a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model;

[0026] A simulation module, used for adding passivators of different mass fractions to the composite model, setting simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model with the passivators added to obtain preset evaluation parameter values ​​corresponding to the different mass fractions;

[0027] A determination module is used to determine the optimal target mass score of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule.

[0028] Preferably, the determination module comprises: a first determination unit and a second determination unit;

[0029] The first determining unit is used to determine that the evaluation rule is that the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest;

[0030] The second determination unit is used to determine a target preset evaluation parameter value that satisfies the evaluation rule among the preset evaluation parameter values, and determine a mass score corresponding to the target preset evaluation parameter value as the optimal target mass score for the passivator to protect the transformer from multiple sulfur.

[0031] According to a third aspect of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for determining the multiple sulfur protection concentration of the passivator for the transformer is implemented.

[0032] According to the fourth aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein when the processor executes the program, the method for determining the multiple sulfur protection concentration of the transformer by the passivator is implemented.

[0033] By means of the above technical scheme, the present invention provides a method, device and equipment for determining the concentration of a passivator for multiple sulfur protection of a transformer. First, a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model is constructed; then, different mass fractions of passivators are added to the composite model, simulation conditions are set, preset evaluation parameters are determined, and simulation calculations are performed on the composite model with the passivator added to obtain preset evaluation parameter values ​​corresponding to different mass fractions; finally, the optimal target mass fraction of the passivator for multiple sulfur protection of the transformer is determined according to the preset evaluation parameter values ​​and evaluation rules. Through the technical scheme of the present invention, a composite model is constructed to simulate the actual transformer environment, and different mass fractions of passivators are added to the composite model. Simulation simulation, specifically reaction molecular dynamics simulation simulation, is used to measure the preset evaluation parameter values ​​of the preset evaluation parameters under different mass fractions of passivators. Since the preset evaluation parameters are related to the protective effect of the passivator, the optimal mass fraction of the passivator for multiple sulfur protection of the transformer can be determined according to the preset evaluation parameter values ​​and evaluation rules, thereby quantifying the protective concentration of the passivator for multiple sulfur corrosion.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the local application. In the drawings:

[0036] Figure 1 A schematic flow chart of a method for determining the multiple sulfur protection concentration of a transformer by a passivating agent provided in an embodiment of the present invention is shown;

[0037] Figure 2 A schematic flow chart of another method for determining the multiple sulfur protection concentration of a transformer by a passivating agent provided in an embodiment of the present invention is shown;

[0038] Figure 3 A schematic diagram of the structure of a device for determining multiple sulfur protection concentrations of a passivating agent for a transformer provided by an embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram of the structure of another device for determining multiple sulfur protection concentrations of a transformer by a passivating agent provided in an embodiment of the present invention is shown;

[0040] Figure 5A relationship curve between the content of a passivating agent and the van der Waals energy provided by an embodiment of the present invention is shown;

[0041] Figure 6 A relationship curve between the content of a passivating agent and the elastic modulus provided in an embodiment of the present invention is shown;

[0042] Figure 7 A curve showing the relationship between the content of a passivating agent and the number of hydrogen bonds provided by an embodiment of the present invention is shown;

[0043] Figure 8 The figure shows a relationship curve between simulation time and mean square displacement provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0045] This embodiment provides a method for determining the multi-sulfur protection concentration of a passivating agent for a transformer, such as Figure 1 As shown, the method includes:

[0046] 101. Construct a composite model consisting of an oil-sulfur model, an insulating paper model, and a copper model.

[0047] 102. Add passivators of different mass fractions to the composite model, set simulation conditions, determine preset evaluation parameters, perform simulation calculations on the composite model with the passivators added, and obtain preset evaluation parameter values ​​corresponding to the different mass fractions.

[0048] 103. Determine the optimal target mass score of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule.

[0049] It should be noted that the highly active sulfides present in transformer oil, i.e. insulating oil, react with copper wires to generate copper sulfides, which are deposited on the surface of insulating paper, reducing the electrical properties of the insulating paper and causing insulation failure. Therefore, passivators are added to insulating oil to inhibit sulfur corrosion. The principle of passivators inhibiting sulfur corrosion is that the passivators first react with copper, and the generated compounds adhere to the copper surface to form a protective film, thereby preventing further reaction between copper and sulfur, thereby inhibiting sulfur corrosion.

[0050] For steps 101-103 of the embodiment, the purpose is to determine the optimal target mass fraction of the passivator for multiple sulfur protection of the transformer under simulation rather than experimental means. Therefore, it is necessary to simulate the actual transformer environment, that is, to construct a composite model by an oil-sulfur model, an insulating paper model and a copper model, and then based on the composite model, add passivators with different mass fractions, perform reaction molecular dynamics simulation, and determine the preset evaluation parameters related to the protection effect, which correspond to the evaluation rules. In this way, by analyzing the preset evaluation parameter values ​​under the evaluation rules, the passivator with different mass fractions can be analyzed. The multiple sulfur protection effect of the transformer can be analyzed, thereby determining the optimal target mass fraction.

[0051] The present invention provides a method, device and equipment for determining the concentration of a passivator for multiple sulfur protection of a transformer. First, a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model is constructed; then, different mass fractions of passivators are added to the composite model, simulation conditions are set, preset evaluation parameters are determined, and simulation calculations are performed on the composite model with the passivator added to obtain preset evaluation parameter values ​​corresponding to different mass fractions; finally, the optimal target mass fraction of the passivator for multiple sulfur protection of the transformer is determined according to the preset evaluation parameter values ​​and evaluation rules. Through the technical solution of the present invention, a composite model is constructed to simulate the actual transformer environment, and different mass fractions of passivators are added to the composite model. Simulation simulation, specifically reaction molecular dynamics simulation simulation, is used to measure the preset evaluation parameter values ​​of the preset evaluation parameters under different mass fractions of passivators. Since the preset evaluation parameters are related to the protective effect of the passivator, the optimal mass fraction of the passivator for multiple sulfur protection of the transformer can be determined according to the preset evaluation parameter values ​​and evaluation rules, thereby quantifying the protective concentration of the passivator for multiple sulfur corrosion.

[0052] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another method for determining the multiple sulfur protection concentration of the passivator for the transformer is provided, such as Figure 2 As shown, the method includes:

[0053] 201. Determine multiple sulfides, insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil, and construct an oil-sulfur model according to the multiple sulfides, the insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil.

[0054] For this embodiment, multiple sulfides are determined. As an implementation method, the types of multiple sulfides and the number of sulfur atoms are determined, wherein the types of multiple sulfides are: dibenzyl disulfide, hexadecanethiol and benzothiophene, and the number of sulfur atoms is 24. There are many options for multiple sulfides, which are not limited here.

[0055] Determine the insulating oil, the number of insulating oil molecules and the density of the insulating oil. As an implementation method, 12 C 20 H 42 Molecule, 6 C 20 H 38 Molecule and 2 C 20 H 26 The density of insulating oil is 0.86g / cm 3 .

[0056] 202. Establish an amorphous region according to the repeating unit, set the degree of polymerization of the cellulose chain, determine the density of cellulose molecules according to the density of the insulating paper, and construct an insulating paper model according to the amorphous region, the degree of polymerization and the density of cellulose molecules.

[0057] For this example, as an implementation method, cellobiose is used as a repeating unit to establish an amorphous region, the degree of polymerization of the cellulose chain is set to 50, and the density of the cellulose molecule refers to the density of the insulating paper 1.5g / cm 3 .

[0058] 203. Determine a stacking method, a lattice parameter, and the number of copper unit cells, and construct a copper model according to the stacking method, the lattice parameter, and the number of copper unit cells.

[0059] For this embodiment, as an implementation method, the copper model belongs to the FM-3M space group, and the stacking method is face-centered cubic stacking. The lattice parameters are α=β=γ=90°. The copper model consists of 6×6×3 copper unit cells.

[0060] 204. Set the positional relationship and thickness ratio of the oil-sulfur model, the insulating paper model, and the copper model.

[0061] 205. Construct a composite model according to the positional relationship and the thickness ratio, so as to simulate actual internal insulation of the transformer using the composite model.

[0062] For example, steps 204 and 205 are positioned between the oil-sulfur model and the copper model. For example, the copper model is on the left, the insulating paper model is in the middle, and the oil-sulfur model is on the right. The thickness ratio of the oil-sulfur model, the insulating paper model, and the copper model is set to 1:2:2.

[0063] 206. Add passivators of different mass fractions to the composite model, set simulation conditions, determine preset evaluation parameters, perform simulation calculations on the composite model with the passivators added, and obtain preset evaluation parameter values ​​corresponding to the different mass fractions.

[0064] It should be noted that since the less the passivation agent is added, the more economical it is, an upper limit of the amount of passivation agent added can be set, for example: 200×10 -6 , adding different mass fractions of passivators to the composite model, can be done gradually, and then fitting the curve of the preset evaluation parameter and the passivator. Wherein, the passivator can be methylbenzotriazole (TTA), which is not limited here.

[0065] For this embodiment, as an implementation method, simulation conditions are set, and the simulation conditions include: force field, temperature, pressure, a first preset duration of the relaxation process under a constant temperature and pressure ensemble, and a second preset duration of the reaction molecular dynamics simulation calculation under a canonical ensemble; determine the preset evaluation parameters, and perform geometric optimization on the composite model to which the passivating agent is added to determine the stable configuration of the molecule; perform relaxation calculations for the first preset duration under the constant temperature and pressure ensemble, and perform reaction molecular dynamics simulation calculations for the second preset duration under the canonical ensemble to obtain preset evaluation parameter values ​​corresponding to different mass fractions.

[0066] The force field is the Compass III force field, which is applicable to a wide range of molecules and polymers. The pressure is kept at standard atmospheric pressure, the temperature is set to 413 K, and the first preset duration of the relaxation process under the constant temperature and pressure ensemble is 100 ps (picoseconds, 1 ps = 10 -12 s), the second preset time length of the reaction molecular dynamics simulation calculation under the canonical ensemble is 200ps.

[0067] The conjugate gradient algorithm is used for geometric optimization to ensure that the system energy is at the lowest point to determine the stable configuration of the molecule. Under the constant temperature and pressure ensemble, the relaxation calculation of the first preset time is performed to balance the system energy.

[0068] Determining the preset evaluation parameter includes: determining the preset evaluation parameter to be at least one of van der Waals energy, elastic modulus, and hydrogen bond number, wherein the van der Waals energy is the van der Waals energy of insulating oil molecules, the elastic modulus is the elastic modulus of cellulose molecules, and the hydrogen bond number is the hydrogen bond number of cellulose molecules.

[0069] like Figure 5 As shown, when the preset evaluation parameter includes van der Waals energy, the values ​​of van der Waals energy corresponding to different mass fractions are obtained after the reaction molecular dynamics simulation calculation.

[0070] like Figure 6 As shown, when the preset evaluation parameter includes an elastic modulus, the values ​​of the elastic modulus corresponding to different mass fractions are obtained after the reaction molecular dynamics simulation calculation.

[0071] like Figure 7As shown, when the preset evaluation parameter includes the number of hydrogen bonds, the values ​​of the number of hydrogen bonds corresponding to different mass fractions are obtained after the reaction molecular dynamics simulation calculation.

[0072] 207. Determine the evaluation rule as follows: the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest.

[0073] 208. Determine a target preset evaluation parameter value that satisfies the evaluation rule among the preset evaluation parameter values, and determine a mass score corresponding to the target preset evaluation parameter value as an optimal target mass score for the passivator for multiple sulfur protection of the transformer.

[0074] It should be noted that from the perspective of the microscopic mechanism of the passivation agent's protection of transformer multiple sulfur, the values ​​of van der Waals energy are all negative, indicating that atoms attract each other, also known as intermolecular forces, which is a weak mutual attraction between molecules. As the protective effect of the passivation agent increases, the van der Waals energy should increase. Figure 5 It can be seen that the van der Waals energy of insulating oil increases with the increase of the mass fraction of passivator, and the trend slows down. -6 The reason is that the addition of passivator can reduce the formation of acidic substances in insulating oil, stabilize the acid-base balance of oil by neutralizing the acidic ions of acidic substances, thereby delaying the aging of insulating oil and the adverse effects of acidic substances on equipment; however, the solubility of passivator is general, so when the passivator is added to a mass fraction of 150×10 -6 When the solubility reaches the maximum, the passivator is added, and some insoluble passivator molecules become impurity particles, which accelerate the aging of the insulating oil to a certain extent. This is also consistent with the trend of the molecular chain movement of the insulating oil with the addition of the passivator. In general, the addition of the passivator is beneficial to the thermal stability of the insulating oil and helps to delay the aging of the insulating oil. However, the solubility of the passivator is general. If too much is added, it will accelerate the aging of the insulating oil to a certain extent. Therefore, there is an upper limit to the mass fraction of the passivator added, which can be added up to a mass fraction of 150×10 -6 .

[0075] Depend on Figure 6 It can be seen that compared with the blank control group, the addition of 50×10 -6The elastic modulus increases significantly after adding the passivator with a certain mass fraction, and then increases slowly with the increase of the passivator content. This is because when the passivator is not added, the multiple sulfides will quickly react with copper at high temperature to form copper sulfide, thereby aging the amorphous fiber region of the insulating paper. The amorphous region has an unstable structure and is most susceptible to damage, and the reaction rate of molecular chain breakage is fast. Once the addition of the passivator hinders the reaction between the sulfide and copper, it will greatly slow down the speed at which the amorphous fiber region of the insulating paper is destroyed, causing the elastic modulus to have a significant upward trend at the beginning. From the overall trend, the addition of the passivator causes the elastic modulus to continue to rise. It can be seen that the addition of the passivator has little effect on the elastic modulus of the cellulose molecules in the insulating paper, that is, it protects the stability of the cellulose molecules, reduces the severity of the deformation of the insulating paper, delays the aging of the insulating paper, and is beneficial to enhancing the electrical strength and mechanical properties of the insulating medium.

[0076] Depend on Figure 7 It can be seen that with the increase of the passivator content, the number of hydrogen bonds of cellulose molecules increases; the reason is that in the blank control group without passivator, firstly, the sulfide itself will have a certain destructive effect on the hydrogen bonds of the insulating paper, and secondly, the copper ions produced by the reaction of sulfide and copper and the acidic substances generated by the insulating oil caused by copper ions will have a destructive effect on the hydrogen bonds of the insulating paper, and the addition of passivator will inhibit the occurrence of the above destructive effects; from the overall trend, the addition of passivator has no effect on the mechanical properties of cellulose, and can well inhibit the damage of sulfide to the insulating paper, and play a good protective effect.

[0077] During simulation, the mean square displacement of the insulating oil molecules can also be calculated, using Figure 8 It can be seen that the overall trend is that the mean square displacement decreases after the passivator is added to the insulating oil containing multiple sulfides, and when the mass fraction of the added passivator is 150×10 -6 Previously, the passivation agent decreased with the increase of the mass fraction of the added passivator, which was approximately inversely proportional. There are two reasons for this. First, the passivator can react with the precursor of corrosive sulfur, thereby inhibiting the sulfide from accelerating the aging of the insulating oil. Second, the film-forming effect of the passivator hinders the reaction of active sulfide with copper to form cuprous sulfide, thereby hindering the generation of copper ions. Since the copper ions in the oil will increase the viscosity and acid value of the insulating oil, and the acid can convert part of the copper element into copper ions, increasing the amount of cuprous sulfide precipitation and making the oil paper aging more serious, the addition of the passivator hinders the aging of the insulating oil. -6 The mean square displacement increases when the mass fraction of the passivator added is more than 150×10 -6of passivator, but it was still smaller than the blank control group (i.e. the group without passivator); this is because after too much passivator was added, passivators that did not participate in the film-forming effect appeared. These passivators were equivalent to impurity particles, which would instead promote oxidation, polymerization and degradation of the insulating oil, accelerate aging of the insulating oil at high temperatures, and lead to the formation of acidic substances and products in the oil, thereby reducing the thermal stability of the insulating oil and causing an increase in the mean square displacement, but overall it still played a protective role relative to the blank control group.

[0078] In summary, the protective effect is related to the passivator content. Too high a passivator mass fraction will affect the quality of insulating oil, but will have no effect on the quality of insulating paper.

[0079] It should be noted that the less the passivation agent is added, the more economical it is. For steps 207 and 208 of the embodiment, Figure 5 , 6 , 7, it can be seen that no matter which of the preset evaluation parameters is van der Waals energy, elastic modulus, or the number of hydrogen bonds, the evaluation rule is that the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest. Specifically, the passivator mass fraction range corresponding to the maximum growth rate of the preset evaluation parameter value can be determined first, and then the passivator mass fraction that maximizes the preset evaluation parameter value within this passivator mass fraction range is selected as the target mass fraction for the optimal passivator for transformer multi-sulfur protection. Taking the preset evaluation parameter as van der Waals energy as an example, Figure 5 As shown in Figure 2, the mass fraction of the passivating agent that makes the van der Waals energy increase at the maximum rate is 0-50×10 -6 In this range, the mass fraction of the passivator that maximizes the value of van der Waals energy is 50×10 -6 , therefore, the target mass fraction is 50×10 -6 .

[0080] The present invention provides a method, device and equipment for determining the concentration of a passivator for multiple sulfur protection of a transformer. First, a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model is constructed; then, different mass fractions of passivators are added to the composite model, simulation conditions are set, preset evaluation parameters are determined, and simulation calculations are performed on the composite model with the passivator added to obtain preset evaluation parameter values ​​corresponding to different mass fractions; finally, the optimal target mass fraction of the passivator for multiple sulfur protection of the transformer is determined according to the preset evaluation parameter values ​​and evaluation rules. Through the technical solution of the present invention, a composite model is constructed to simulate the actual transformer environment, and different mass fractions of passivators are added to the composite model. Simulation simulation, specifically reaction molecular dynamics simulation simulation, is used to measure the preset evaluation parameter values ​​of the preset evaluation parameters under different mass fractions of passivators. Since the preset evaluation parameters are related to the protective effect of the passivator, the optimal mass fraction of the passivator for multiple sulfur protection of the transformer can be determined according to the preset evaluation parameter values ​​and evaluation rules, thereby quantifying the protective concentration of the passivator for multiple sulfur corrosion.

[0081] Further, as Figure 1 and Figure 2 The specific implementation of the method shown in the figure, the embodiment of the present invention provides a device for determining the multiple sulfur protection concentration of the passivating agent for the transformer, such as Figure 3 As shown, the device includes: a first construction module 31, a simulation module 32, and a determination module 33;

[0082] A first construction module 31 is used to construct a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model;

[0083] A simulation module 32 is used to add a passivator with different mass fractions to the composite model, set simulation conditions, determine preset evaluation parameters, and perform simulation calculations on the composite model with the passivator added to obtain preset evaluation parameter values ​​corresponding to different mass fractions;

[0084] The determination module 33 is used to determine the optimal target mass score of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule.

[0085] In specific application scenarios, such as Figure 4As shown, a device for determining the multi-sulfur protection concentration of a passivating agent for a transformer, the device also includes: a second construction module 34, which can be specifically used to determine multi-sulfide, insulating oil, the number of molecules of the insulating oil and the density of the insulating oil, and construct an oil-sulfur model according to the multi-sulfide, the insulating oil, the number of molecules of the insulating oil and the density of the insulating oil, wherein the multi-sulfide includes: dibenzyl disulfide, hexadecanethiol and benzothiophene; establish an amorphous region according to a repeating unit, set the degree of polymerization of a cellulose chain, determine the density of cellulose molecules according to the density of insulating paper, and construct an insulating paper model according to the amorphous region, the degree of polymerization and the density of cellulose molecules; determine the stacking method, lattice parameters and the number of copper unit cells, and construct a copper model according to the stacking method, the lattice parameters and the number of copper unit cells.

[0086] Accordingly, in order to construct a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model, the first construction module 31 can be specifically used to set the positional relationship and thickness ratio of the oil-sulfur model, the insulating paper model and the copper model; and construct a composite model according to the positional relationship and the thickness ratio, so as to use the composite model to simulate the actual internal insulation of the transformer.

[0087] Accordingly, in order to set the simulation conditions and determine the preset evaluation parameters, the composite model with the passivator added is simulated and calculated to obtain the preset evaluation parameter values ​​corresponding to the different mass fractions. The simulation module 32 can also be used to set the simulation conditions, and the simulation conditions include: force field, temperature, pressure, a first preset duration of the relaxation process under a constant temperature and pressure ensemble, and a second preset duration of the reaction molecular dynamics simulation calculation under a canonical ensemble; determine the preset evaluation parameters, and perform geometric optimization on the composite model with the passivator added to determine the stable configuration of the molecule; perform relaxation calculations for the first preset duration under the constant temperature and pressure ensemble, and perform reaction molecular dynamics simulation calculations for the second preset duration under the canonical ensemble to obtain the preset evaluation parameter values ​​corresponding to the different mass fractions.

[0088] Accordingly, in order to determine the optimal target mass score of the passivator for multiple sulfur protection of the transformer according to the preset evaluation parameter value and the evaluation rule, the determination module 33 is specifically used to determine that the evaluation rule is that the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest, determine the target preset evaluation parameter value that meets the evaluation rule among the preset evaluation parameter values, and determine the mass score corresponding to the target preset evaluation parameter value as the optimal target mass score of the passivator for multiple sulfur protection of the transformer.

[0089] Accordingly, in order to determine the preset evaluation parameter, the simulation module 32 can be specifically used to determine that the preset evaluation parameter is at least one of the van der Waals energy, the elastic modulus and the number of hydrogen bonds.

[0090] It should be noted that for other corresponding descriptions of the functional units involved in the device for determining the multiple sulfur protection concentration of a passivating agent for a transformer provided in this embodiment, reference can be made to Figure 1 to Figure 2 The corresponding description will not be repeated here.

[0091] Based on the above Figure 1 to Figure 2 The method shown in the embodiment, accordingly, also provides a storage medium, which can be volatile or non-volatile, and stores a computer program, which is executed by a processor to implement the above-mentioned Figure 1 to Figure 2 The method for determining the multi-sulfur protection concentration of the passivator for the transformer is shown.

[0092] Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various implementation scenarios of the present invention.

[0093] Based on the above Figure 1 to Figure 2 The method shown and Figure 3 , Figure 4 In order to achieve the above-mentioned purpose, the present embodiment further provides a computer device, which includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 to Figure 2 The method for determining the multi-sulfur protection concentration of the passivator for the transformer is shown.

[0094] Optionally, the computer device may further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0095] Those skilled in the art will appreciate that the computer device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0096] The storage medium may also include an operating network communication module. The operating is a program that manages the hardware and software resources of the above-mentioned computer device, supporting the operation of the information processing program and other software and / or programs. The network communication module is used to communicate between the components inside the storage medium, and to communicate with other hardware and software in the information processing entity device.

[0097] Through the description of the above implementation modes, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, or by hardware.

[0098] The present invention provides a method, device and equipment for determining the concentration of a passivator for multiple sulfur protection of a transformer. First, a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model is constructed; then, different mass fractions of passivators are added to the composite model, simulation conditions are set, preset evaluation parameters are determined, and simulation calculations are performed on the composite model with the passivator added to obtain preset evaluation parameter values ​​corresponding to different mass fractions; finally, the optimal target mass fraction of the passivator for multiple sulfur protection of the transformer is determined according to the preset evaluation parameter values ​​and evaluation rules. Through the technical solution of the present invention, a composite model is constructed to simulate the actual transformer environment, and different mass fractions of passivators are added to the composite model. Simulation simulation, specifically reaction molecular dynamics simulation simulation, is used to measure the preset evaluation parameter values ​​of the preset evaluation parameters under different mass fractions of passivators. Since the preset evaluation parameters are related to the protective effect of the passivator, the optimal mass fraction of the passivator for multiple sulfur protection of the transformer can be determined according to the preset evaluation parameter values ​​and evaluation rules, thereby quantifying the protective concentration of the passivator for multiple sulfur corrosion.

[0099] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present invention. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0100] The above serial numbers of the present invention are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of the present invention, but the present invention is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A method for determining the multi-sulfur protection concentration of a passivator for a transformer, characterized in that: The method comprises: Construct a composite model consisting of an oil-sulfur model, an insulating paper model, and a copper model; Adding passivators of different mass fractions to the composite model, setting simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model to which the passivators are added to obtain preset evaluation parameter values ​​corresponding to the different mass fractions; The optimal target mass score of the passivator for transformer multi-sulfur protection is determined according to the preset evaluation parameter value and the evaluation rule.

2. The method according to claim 1, characterized in that Before constructing the composite model consisting of the oil-sulfur model, the insulating paper model and the copper model, the method further includes: Determining multiple sulfides, insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil, and constructing an oil-sulfur model according to the multiple sulfides, the insulating oil, the number of molecules of the insulating oil, and the density of the insulating oil; Establishing an amorphous region according to the repeating unit, setting the degree of polymerization of the cellulose chain, determining the density of cellulose molecules according to the density of the insulating paper, and constructing an insulating paper model according to the amorphous region, the degree of polymerization and the density of cellulose molecules; The stacking method, lattice parameters and the number of copper unit cells are determined, and a copper model is constructed according to the stacking method, the lattice parameters and the number of copper unit cells.

3. The method according to claim 1 or 2, characterized in that: The composite model consisting of an oil-sulfur model, an insulating paper model and a copper model is constructed, including: Setting the positional relationship and thickness ratio of the oil-sulfur model, the insulating paper model and the copper model; A composite model is constructed according to the positional relationship and the thickness ratio, so as to simulate the actual internal insulation of the transformer by using the composite model.

4. The method according to claim 1, characterized in that The setting of simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model with the passivator added thereto to obtain preset evaluation parameter values ​​corresponding to different mass fractions include: Setting simulation conditions, wherein the simulation conditions include: force field, temperature, pressure, a first preset duration of the relaxation process under a constant temperature and constant pressure ensemble, and a second preset duration of the reaction molecular dynamics simulation calculation under a canonical ensemble; Determine preset evaluation parameters, and perform geometric optimization on the composite model to which the passivating agent is added to determine the stable configuration of the molecule; Under the constant temperature and constant pressure ensemble, relaxation calculations of the first preset time length are performed, and under the canonical ensemble, molecular dynamics simulation calculations of the reaction of the second preset time length are performed to obtain preset evaluation parameter values ​​corresponding to different mass fractions.

5. The method according to claim 1, characterized in that: The step of determining the optimal target mass fraction of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule includes: Determine the evaluation rule as follows: the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest; Determine a target preset evaluation parameter value that satisfies the evaluation rule among the preset evaluation parameter values, and determine the mass score corresponding to the target preset evaluation parameter value as the optimal target mass score for the passivator to the transformer multiple sulfur protection.

6. The method according to claim 1, characterized in that The step of determining the preset evaluation parameters includes: The preset evaluation parameter is determined to be at least one of van der Waals energy, elastic modulus, and the number of hydrogen bonds.

7. A device for determining the multiple sulfur protection concentration of a passivating agent for a transformer, characterized in that: The device comprises: A first building module is used to build a composite model consisting of an oil-sulfur model, an insulating paper model and a copper model; A simulation module, used for adding passivators of different mass fractions to the composite model, setting simulation conditions, determining preset evaluation parameters, and performing simulation calculations on the composite model with the passivators added to obtain preset evaluation parameter values ​​corresponding to the different mass fractions; A determination module is used to determine the optimal target mass score of the passivator for transformer multi-sulfur protection according to the preset evaluation parameter value and the evaluation rule.

8. The device according to claim 7, characterized in that The determination module is specifically used to determine that the evaluation rule is that the growth rate of the preset evaluation parameter value is the largest and the preset evaluation parameter value is the largest, determine the target preset evaluation parameter value that meets the evaluation rule among the preset evaluation parameter values, and determine the mass score corresponding to the target preset evaluation parameter value as the optimal target mass score for the passivator for multiple sulfur protection of the transformer.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining the multiple sulfur protection concentration of the passivator for the transformer as described in any one of claims 1 to 6 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method for determining the multiple sulfur protection concentration of the passivator for the transformer as described in any one of claims 1 to 6 is implemented.

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