Method, device and equipment for evaluating fire resistance of insulating oil and readable storage medium

Abstract

This invention discloses a method, apparatus, device, and readable storage medium for evaluating the flame retardancy of insulating oil. The method includes calculating the flash point temperature, initial Gibbs free energy of pyrolysis, and number of pyrolysis combustible gas molecules of the insulating oil based on its molecular structure information; calculating and determining a flame retardancy index based on the flash point temperature, initial Gibbs free energy of pyrolysis, and number of pyrolysis combustible gas molecules; and comparing the flame retardancy index with a set index threshold to obtain the flame retardancy evaluation result of the insulating oil. This application only requires computer calculations based on the molecular structure information of the insulating oil itself, eliminating the need for dangerous and complex experiments, thus achieving a safe and reliable evaluation of the flame retardancy of insulating oil.

Description

Technical Field

[0001] This invention relates to the field of material performance evaluation, and in particular to a method, apparatus, device, and computer-readable storage medium for evaluating the flame retardancy of insulating oil. Background Technology

[0002] Mineral oil is a traditional liquid insulating medium in oil-immersed transformers, but its ignition point is only 165℃, classifying it as a flammable liquid dielectric. In recent years, frequent fires caused by the flammable insulating oil in oil-immersed transformers have resulted in severe economic losses to the power grid and even threatened personal safety. Therefore, exploring new insulating oils to replace traditional liquid insulating media is crucial for ensuring the safe and stable operation of oil-immersed power equipment. In this process, a reliability assessment of the high-temperature flame-retardant properties of liquid insulating media is key. However, currently, probing the high-temperature flame-retardant properties of insulating oil requires high-risk and costly combustion tests and fire simulation tests, which are difficult to implement and pose significant safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a method, apparatus, device, and computer-readable storage medium for evaluating the flame retardancy of insulating oil, which can achieve a safe and effective evaluation of the flame retardancy of insulating oil without the need for dangerous and complex tests.

[0004] To address the aforementioned technical problems, this invention provides a method for evaluating the flame-retardant properties of insulating oil, comprising:

[0005] Based on the molecular structure information of the insulating oil to be evaluated, the flash point temperature, initial cracking Gibbs free energy and number of cracking combustible gas molecules of the insulating oil to be evaluated are calculated.

[0006] The flame resistance index is calculated and determined based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules.

[0007] The flame retardant index is compared with the set index threshold to obtain the flame retardant performance evaluation result of the insulating oil to be evaluated.

[0008] Optionally, the flame retardancy index is calculated and determined based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules, including:

[0009] According to the fire resistance index calculation model The flame retardancy index is determined by calculation; wherein, For fire resistance index, The flash point temperature is... The initial pyrolysis Gibbs free energy, The number of molecules of the pyrolyzed combustible gas; All are weighting coefficients.

[0010] Optionally, the weighting coefficients in the flame retardant index calculation model satisfy... .

[0011] Optionally, the process of calculating the flash point temperature of the insulating oil to be evaluated includes:

[0012] Based on the SMILES symbol of the insulating oil to be evaluated, obtain the molar refractive index, electronegativity state value, and highest eigenvalue topological index of the insulating oil to be evaluated.

[0013] Based on the molar refractive index, the electronegativity state value, and the highest eigenvalue topological index, combined with the flash point relation... The flash point temperature is obtained through calculation; wherein, These are the flash point temperature, the electronegativity state value, and the molar refractive index, respectively. For the two highest eigenvalue topological indices.

[0014] Optionally, the process of calculating the initial cracking Gibbs free energy of the insulating oil to be evaluated based on its molecular structure information includes:

[0015] Using the molecular structure information of the insulating oil to be evaluated as input parameters, the initial pyrolysis simulation calculation is performed using the ReaxFF reaction kinetics simulation model, and the forward and reverse reaction rate constants are obtained by combining the reaction frequency statistical algorithm.

[0016] The initial pyrolysis Gibbs free energy is obtained by calculating based on the forward and reverse reaction rate constants.

[0017] Optionally, the process of calculating the number of pyrolysis combustible gas molecules in the insulating oil to be evaluated includes:

[0018] Using the molecular structure information of the insulating oil to be evaluated as input parameters, an initial pyrolysis simulation calculation is performed using the ReaxFF reaction kinetics simulation model. Pyrolysis molecules are screened according to the dynamic bond level threshold and molecular lifetime filtering threshold, and the number of qualified pyrolysis molecules is counted as the number of pyrolysis combustible gas molecules.

[0019] Optionally, the dynamic bond level threshold is 0.55~0.65; the molecular lifetime filtration threshold is 100fs~500fs.

[0020] An instrument for evaluating the flame retardancy of insulating oil, comprising:

[0021] The molecular analysis module is used to calculate the flash point temperature, initial cracking Gibbs free energy, and number of cracking combustible gas molecules of the insulating oil to be evaluated based on the molecular structure information of the insulating oil to be evaluated.

[0022] The index calculation module is used to calculate and determine the flame retardancy index based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules.

[0023] The evaluation calculation module is used to compare the flame retardant index with a set index threshold to obtain the flame retardant performance evaluation result of the insulating oil to be evaluated.

[0024] An instrument for evaluating the flame retardancy of insulating oil, comprising:

[0025] Memory, used to store computer programs;

[0026] A processor for executing the computer program to implement the steps of the method for evaluating the flame retardancy of insulating oil as described in any of the preceding claims.

[0027] A computer-readable storage medium storing a computer program that is executed to implement the steps of the method for evaluating the flame retardancy of insulating oil as described in any of the preceding claims.

[0028] The present invention provides a method, apparatus, device, and computer-readable storage medium for evaluating the flame retardancy of insulating oil. The method for evaluating the flame retardancy of insulating oil includes calculating the flash point temperature, initial pyrolysis Gibbs free energy, and number of pyrolysis combustible gas molecules of the insulating oil to be evaluated based on the molecular structure information of the insulating oil to be evaluated; calculating and determining the flame retardancy index based on the flash point temperature, initial pyrolysis Gibbs free energy, and number of pyrolysis combustible gas molecules; and comparing the flame retardancy index with a set index threshold to obtain the flame retardancy evaluation result of the insulating oil to be evaluated.

[0029] In this application, the molecular structure information of the insulating oil to be evaluated is used to calculate and analyze different molecular characteristic parameters such as flash point temperature, initial cracking Gibbs free energy, and number of cracking combustible gas molecules. Based on these three molecular characteristic parameters, a flame retardancy index that can characterize the flame retardancy performance of the insulating oil to be evaluated is calculated. Finally, the flame retardancy performance evaluation result of the insulating oil to be evaluated is determined based on the flame retardancy index. The entire process only requires computer calculation based on the molecular structure information of the insulating oil to be evaluated itself, without the need for dangerous and complex experiments. This provides reliable data for whether the insulating oil to be evaluated can serve as a reliable insulating medium, while achieving a safe and reliable evaluation of the flame retardancy performance of the insulating oil. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A flowchart illustrating the flame retardancy evaluation method for insulating oil provided in this application embodiment;

[0032] Figure 2 A schematic diagram of the process for determining the initial fracture Gibbs free energy provided in an embodiment of this application;

[0033] Figure 3 A comparative columnar section showing the number of combustible gas molecules of modified palmitate and soybean-based natural ester at different pyrolysis temperatures, provided for embodiments of this application.

[0034] Figure 4 Radar chart of flame retardancy index parameters for modified palmitate and soybean-based natural esters provided in the embodiments of this application;

[0035] Figure 5 This is a structural block diagram of the device for evaluating the flame retardant properties of insulating oil provided in an embodiment of this application. Detailed Implementation

[0036] The core of this invention is to provide a method, apparatus, device, and computer-readable storage medium for evaluating the flame retardancy of insulating oil, which can achieve the evaluation of the flame retardancy of insulating oil without the need for complex and dangerous experiments.

[0037] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, Figure 1 This is a flowchart illustrating the method for evaluating the flame retardant properties of insulating oil provided in this application embodiment.

[0039] In one specific embodiment of this application, the method for evaluating the flame retardant properties of the insulating oil may include:

[0040] S1: Based on the molecular structure information of the insulating oil to be evaluated, calculate the flash point temperature, initial cracking Gibbs free energy, and number of cracked combustible gas molecules of the insulating oil to be evaluated.

[0041] In this embodiment, flash point temperature, Gibbs free energy of initial pyrolysis, and number of pyrolysis combustible gas molecules are selected as characteristics to characterize the high-temperature flame-retardant properties of insulating oil.

[0042] First, flash point temperature is an important macroscopic indicator for evaluating the flame-retardant properties of insulating oils, and its essence is closely related to the volatility of molecules and intermolecular interactions. Flash point temperature is determined by flash point characteristic molecular descriptors, which can reflect the quantitative correlation between molecular structure and the macroscopic flash point of the oil from a microscopic perspective. Therefore, using flash point characteristic molecular descriptors to determine flash point temperature can establish a correlation between molecular structure and macroscopic flame-retardant properties.

[0043] Secondly, the initial cracking Gibbs free energy characterizes the thermodynamic ease with which molecules undergo thermal decomposition. Under high-temperature conditions, the combustion of insulating oil often begins with the thermal decomposition of molecules. A larger initial cracking Gibbs free energy ΔG indicates that the molecular cracking reaction is less likely to occur spontaneously, the molecular structure is more stable at high temperatures, and it is less likely to produce the small molecule combustible components required for subsequent combustion. Therefore, the oil exhibits stronger flame retardancy. Thus, the initial cracking Gibbs free energy reflects the insulating oil's ability to resist high-temperature decomposition from a thermodynamic energy perspective and is a key characteristic parameter for evaluating thermal stability and flame retardancy.

[0044] Finally, the number of pyrolysis combustible gas molecules, i.e., the number of combustible gas molecules produced by the insulating oil during the pyrolysis process; after high-temperature pyrolysis, insulating oil generates combustible gases such as H2, CH4, and C2H4, which are important material basis for maintaining combustion and promoting flame propagation. The larger the number of combustible gas molecules produced by pyrolysis, the more combustible components are generated during the pyrolysis process, making it easier to reach combustion conditions and intensify flame spread, resulting in relatively poor flame resistance. Therefore, the number of pyrolysis combustible gas molecules can characterize the potential combustion risk of insulating oil from the perspective of combustion products.

[0045] In view of this, this embodiment uses the three different characteristic parameters mentioned above—flash point temperature, Gibbs free energy of initial pyrolysis, and number of pyrolysis combustible gas molecules—as the basis for evaluating flame resistance performance, which helps to ensure the accuracy and reliability of the flame resistance performance evaluation.

[0046] Optionally, the process of determining the above flash point temperature may include:

[0047] S111: Based on the SMILES symbol of the insulating oil to be evaluated, obtain the molar refractive index, electronegativity state value and highest eigenvalue topological index of the insulating oil to be evaluated.

[0048] S112: Based on the molar refractive index, electronegativity state value, and the topological index of the highest eigenvalue, combined with the flash point relation. The flash point temperature is obtained through calculation; where, These are the flash point temperature, electronegativity, and molar refractive index, respectively. These are the two highest eigenvalue topological indices.

[0049] It is understandable that the SMILES symbol can represent polymer structures, that is, it belongs to a type of molecular structure information; molar refractive index, electronegativity state value, and highest eigenvalue topological index belong to different molecular descriptors; among them, This is a 2nd-order topological index based on a simple distance matrix (Burden-type, simple / s) and taking the maximum eigenvalue (SpMax). It is the topological index of the 3rd order, based on the modified distance matrix (modified / m), and taking the maximum eigenvalue.

[0050] In practical applications, the above-mentioned different molecular descriptors can be calculated and extracted based on the SMILES symbol using conventional molecular descriptor software tools or programs, such as using the Crippen model to extract the molar refractive index; however, this will not be elaborated in detail in this embodiment.

[0051] After extracting the above four molecular descriptors, the flash point temperature can be calculated according to the flash point formula.

[0052] In another alternative embodiment, such as Figure 2 As shown, the process of determining the initial splitting Gibbs free energy may include:

[0053] S121: Using the molecular structure information of the insulating oil to be evaluated as input parameters, the initial pyrolysis simulation calculation is performed using the ReaxFF reaction kinetics simulation model, and the forward and reverse reaction rate constants are obtained by combining the reaction frequency statistical algorithm.

[0054] S122: The initial Gibbs free energy difference of pyrolysis is obtained by calculating the forward and reverse reaction rate constants.

[0055] The ReaxFF reaction kinetics simulation model in this embodiment is essentially a microscopic trajectory simulation tool. It uses LAMMPS software as an engine to simulate the breaking and formation of polymer chemical bonds based on ReaxFF reaction kinetics. It simulates which chemical bonds are broken and what free radicals or fragments are generated during the simulation time. At each time step or specified interval, it counts all chemical species (including reactants, intermediates, and products) and finally derives the data on the change of the quantity of each chemical species over time during the entire simulation process.

[0056] Based on the time-varying data of the quantity of each chemical substance derived from the above ReaxFF reaction kinetics simulation model, the forward reaction rate constant kr and the reverse reaction rate constant kf are further determined by combining the reaction frequency statistical algorithm.

[0057] After obtaining the forward and reverse reaction rate constants, further calculations are performed using the Gibbs free energy difference formula. The Gibbs free energy is obtained through calculation. , which is the initial Gibbs free energy of pyrolysis; where R is the ideal gas constant and T is the thermodynamic temperature.

[0058] Based on this, the simulation calculation of the initial pyrolysis process using the ReaxFF reaction kinetics simulation model, and the set dynamic bond level threshold and molecular lifetime filtering threshold, can further screen the pyrolysis molecules generated during the simulated pyrolysis process, and count the number of qualified pyrolysis molecules as the number of pyrolysis combustible gas molecules.

[0059] Specifically, the number of combustible gas molecules simulated in the ReaxFF reaction kinetic model can be counted, and a dynamic bond level threshold of BOcutoff = 0.55~0.65 can be set as a physical criterion for determining whether bonds have formed between atoms. Based on the depth-first search (DFS) algorithm, the above dynamic bond level threshold is used to perform topological clustering of all atoms in the system. By identifying the elemental composition and number of atoms in each independent cluster, the chemical formula of the molecules is automatically labeled. At the same time, a product existence lifetime threshold τ is introduced, which can be set to 100fs~500fs. Only when a combustible molecule persists for more than τ is it included in the final product statistics. This effectively eliminates the interference of transient pseudobonds caused by thermal vibration, improves the physical accuracy of stable product evaluation, and finally determines the number of pyrolysis combustible gas molecules.

[0060] S2: The flame retardancy index is calculated based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules.

[0061] In this step, the fire resistance index can be calculated based on a pre-created fire resistance index calculation model. Optionally, the fire resistance index calculation model can be... ;in, For fire resistance index, This is the flash point temperature. The initial Gibbs free energy of the splitting process. This represents the number of pyrolyzed combustible gas molecules. All are weighting coefficients.

[0062] In the fire resistance index calculation model As a positive indicator, The flash point temperature is a negative indicator. Considering that the three elements of combustion are temperature, combustible material, and external oxygen, and that the initial pyrolysis Gibbs free energy and the number of combustible gas molecules produced by pyrolysis are simulation parameters obtained from high-temperature thermal pyrolysis simulations, they are essentially related to the condition of combustible material. Therefore, in the fire resistance index calculation model... The values ​​between can satisfy ,For example The values ​​are 0.5, 0.25, and 0.25 respectively. The flame resistance index is obtained by weighting and summing the macroscopic flash point, cracking energy barrier and combustible products.

[0063] In another optional embodiment of this application, the flame retardant index calculation model can also be a model that has been learned and trained in advance through a neural network model, and this application does not impose specific restrictions on this.

[0064] S3: Compare the flame retardancy index with the set index threshold to obtain the flame retardancy performance evaluation result of the insulating oil to be evaluated.

[0065] In this step, the set index threshold can be determined by statistically analyzing the flame retardancy indices of a large number of polymers with known flame retardancy properties. The average flame retardancy index of a large number of polymers with relatively moderate flame retardancy properties can be selected as the set index threshold.

[0066] In one optional embodiment of this application, soybean-based natural esters, modified palmitate, and diisooctyl sebacate are used as examples to determine their respective flame-retardant properties.

[0067] 1) Calculate the flash point temperature.

[0068] The main component of soybean-based natural esters is triglycerides, with triglyceride trilinoleate accounting for a large proportion. Therefore, triglyceride trilinoleate is used as the representative molecular structure of soybean-based natural esters. The typical molecular skeleton of modified palmitate is... The typical molecular skeleton of soybean-based natural esters is The representative molecular framework of diisooctyl sebacate is .

[0069] Based on the SMILES symbols of modified palmitate, soybean-based natural ester, and diisooctyl sebacate, molecular characteristics related to flash point were obtained; as shown in Table 1 below, the relative error between the predicted flash point temperature and the actual measured flash point temperature is less than 5%. The flash point of soybean-based natural ester is significantly higher than that of modified palmitate.

[0070] Table 1. Molecular characteristics of different insulating oil molecules related to flash point

[0071]

[0072] 2) Calculate the initial pyrolysis Gibbs free energy ΔG.

[0073] The pyrolysis temperature was set at 2700 K~3300 K. The high-temperature pyrolysis pathways of soybean-based natural esters, modified palmitate, and diisooctyl sebacate were similar, with the initial pyrolysis being a homolytic cleavage of ester bonds. Based on the ReaxFF reaction kinetic model, the reaction frequencies were statistically analyzed, and the relevant high-temperature pyrolysis performance parameters are shown in Table 2 below. ΔG is the energy criterion, and all values ​​are greater than 0, indicating that all are endothermic and non-spontaneous reactions. However, the ΔG of modified palmitate is 172.1 kJ / mol, which is smaller than that of soybean-based natural ester (223.8 kJ / mol) and diisooctyl sebacate (192.7 kJ / mol), indicating that soybean-based natural esters and diisooctyl sebacate have better high-temperature thermal stability.

[0074] Table 2 Gibbs Free Energy of Modified Palmitate and Soy-Based Natural Ester

[0075]

[0076] 3) Calculate the number of combustible gas molecules.

[0077] like Figure 3 As shown, the number of combustible gas molecules generated during the thermal decomposition of soybean-based natural esters, modified palmitate, and diisooctyl sebacate, including CO, H2, CH4, C2H2, C2H4, and C2H6, poses a potential threat to fire safety. Within the temperature range of 2700 K to 3300 K, modified palmitate generates 101 combustible gas molecules, soybean-based natural ester generates 75, and diisooctyl sebacate generates 83.

[0078] 4) Comparison of fire resistance index and comprehensive evaluation results.

[0079] After obtaining the predicted flash point temperature, Gibbs free energy of pyrolysis, and number of combustible products, the three characteristic parameters of the modified palmitate and soybean-based natural ester were first normalized, and then weighted and summed to obtain the flame retardancy index; for example... Figure 4 As shown, a radar chart was used to compare three flame-retardant index parameters of the two oil products. Substituting the weighted flame-retardant index parameters into the flame-retardant index function, the flame-retardant index of soybean-based natural ester was 0.750, that of modified palm ester was 0.250, and that of diisooctyl sebacate was 0.423. (Comparison) Figure 4 It can be seen that the corresponding flame resistance from strong to weak is: soybean-based natural ester > diisooctyl sebacate > modified palmitate.

[0080] Combustion characteristics of different ester-based insulating liquids were tested using a cone calorimeter (according to ISO 5660-1 standard). The heat release rate was measured under the same radiative heat flux conditions. A higher heat release rate indicates more vigorous combustion and poorer flame resistance, while a lower heat release rate indicates weaker combustion and better flame resistance. The heat release rate for soybean-based natural esters was 426.57 kW / m³. 2 Diisooctyl sebacate has a power output of 492.6 kW / m³. 2 The modified palmitate has a power output of 523.48 kW / m³. 2 In other words, the flame retardancy of the three oils is ranked as follows: soybean-based natural ester > diisooctyl sebacate > modified palmitate. The flame retardancy strength determined by the flame retardancy index calculated according to the above embodiments in this application is consistent. Therefore, it can be seen that the flame retardancy index determined in this application can accurately and reliably characterize the flame retardancy of insulating liquids.

[0081] In summary, this application uses the molecular structure information of the insulating oil to be evaluated to calculate and analyze different molecular characteristic parameters such as flash point temperature, initial cracking Gibbs free energy, and number of cracking combustible gas molecules. Based on these three molecular characteristic parameters, a flame retardancy index that can characterize the flame retardancy of the insulating oil is calculated. Finally, the flame retardancy evaluation result of the insulating oil is determined based on the flame retardancy index. The entire process only requires computer calculation based on the molecular structure information of the insulating oil itself, without the need for dangerous and complex experiments. This provides reliable data for whether the insulating oil can serve as a reliable insulating medium, while achieving a safe and reliable evaluation of the flame retardancy of the insulating oil.

[0082] The following describes the flame-retardant performance evaluation device for insulating oil provided in the embodiments of the present invention. The flame-retardant performance evaluation device for insulating oil described below can be referred to in correspondence with the flame-retardant performance evaluation method for insulating oil described above.

[0083] Figure 5 The structural block diagram of the insulating oil flame retardancy evaluation device provided in the embodiments of this application is shown below. Figure 5 The device for evaluating the flame retardancy of insulating oil may include:

[0084] The molecular analysis module 100 is used to calculate the flash point temperature, initial cracking Gibbs free energy and number of cracking combustible gas molecules of the insulating oil to be evaluated based on the molecular structure information of the insulating oil to be evaluated.

[0085] The index calculation module 200 is used to calculate and determine the flame retardancy index based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules.

[0086] The evaluation calculation module 300 is used to compare the flame retardant index with a set index threshold to obtain the flame retardant performance evaluation result of the insulating oil to be evaluated.

[0087] In one optional embodiment of this application, the index calculation module 200 is used to calculate the fire resistance index based on the fire resistance index model. The flame retardancy index is determined by calculation; wherein, For fire resistance index, These are the flash point temperature, the initial pyrolysis Gibbs free energy, and the number of pyrolysis combustible gas molecules, respectively. All are weighting coefficients.

[0088] In an optional embodiment of this application, the weighting coefficients in the flame-retardant index calculation model satisfy... .

[0089] In an optional embodiment of this application, the molecular analysis module 100 is specifically used to obtain the molar refractive index, electronegativity state value, and highest eigenvalue topological index corresponding to the insulating oil to be evaluated based on the SMILES symbol of the insulating oil to be evaluated; and to combine the molar refractive index, the electronegativity state value, and the highest eigenvalue topological index with the flash point relation. The flash point temperature is obtained through calculation; wherein, These are the flash point temperature, the electronegativity state value, and the molar refractive index, respectively. For the two highest eigenvalue topological indices.

[0090] In an optional embodiment of this application, the molecular analysis module 100 is specifically used to use the molecular structure information of the insulating oil to be evaluated as input parameters, perform initial pyrolysis simulation calculation using the ReaxFF reaction kinetics simulation model, and calculate the forward and reverse reaction rate constants using the reaction frequency statistical algorithm; and calculate the initial pyrolysis Gibbs free energy based on the forward and reverse reaction rate constants.

[0091] In an optional embodiment of this application, the molecular analysis module 100 is specifically used to use the molecular structure information of the insulating oil to be evaluated as input parameters, perform initial pyrolysis simulation calculation using the ReaxFF reaction kinetics simulation model, and screen the pyrolysis molecules according to the dynamic bond level threshold and molecular lifetime filtering threshold, and count the number of qualified pyrolysis molecules as the number of pyrolysis combustible gas molecules.

[0092] In one optional embodiment of this application, the dynamic bond level threshold is 0.55~0.65; the molecular lifetime filtration threshold is 100fs~500fs.

[0093] The flame-retardant performance evaluation device for insulating oil in this embodiment is used to implement the aforementioned flame-retardant performance evaluation method for insulating oil. Therefore, the specific implementation method of the flame-retardant performance evaluation device for insulating oil can be found in the embodiment section of the flame-retardant performance evaluation method for insulating oil mentioned above. The specific implementation method can be referred to the description of the corresponding embodiment, and will not be repeated here.

[0094] This application also provides an embodiment of an instrument for evaluating the flame retardant properties of insulating oil, the instrument comprising:

[0095] Memory, used to store computer programs;

[0096] A processor for executing the computer program to implement the steps of the method for evaluating the flame retardancy of insulating oil as described in any of the preceding claims.

[0097] The steps of the flame retardancy evaluation method for insulating oil executed by the processor in this embodiment may include:

[0098] Based on the molecular structure information of the insulating oil to be evaluated, the flash point temperature, initial pyrolysis Gibbs free energy, and number of pyrolysis combustible gas molecules of the insulating oil to be evaluated are calculated; based on the flash point temperature, the initial pyrolysis Gibbs free energy, and the number of pyrolysis combustible gas molecules, the flame resistance index is calculated and determined; the flame resistance index is compared with a set index threshold to obtain the flame resistance performance evaluation result of the insulating oil to be evaluated.

[0099] This application also provides an embodiment of a computer-readable storage medium storing a computer program that is executed to implement the steps of the method for evaluating the flame retardancy of insulating oil as described in any one of the claims.

[0100] The computer-readable storage medium in this embodiment may be random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0101] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0102] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A method for evaluating the flame retardant properties of insulating oil, characterized in that, include: Based on the molecular structure information of the insulating oil to be evaluated, the flash point temperature, initial cracking Gibbs free energy and number of cracking combustible gas molecules of the insulating oil to be evaluated are calculated. The flame resistance index is calculated and determined based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules. The flame retardant index is compared with the set index threshold to obtain the flame retardant performance evaluation result of the insulating oil to be evaluated.

2. The method for evaluating the flame retardant properties of insulating oil as described in claim 1, characterized in that, The flame retardancy index is calculated and determined based on the flash point temperature, the initial pyrolysis Gibbs free energy, and the number of pyrolysis combustible gas molecules, including: According to the fire resistance index calculation model The flame retardancy index is determined by calculation; wherein, For fire resistance index, The flash point temperature is... The initial pyrolysis Gibbs free energy, The number of molecules of the pyrolyzed combustible gas; All are weighting coefficients.

3. The method for evaluating the flame retardant properties of insulating oil as described in claim 2, characterized in that, The weighting coefficients in the fire resistance index calculation model satisfy the following: .

4. The method for evaluating the flame-retardant properties of insulating oil as described in any one of claims 1 to 3, characterized in that, The process of calculating the flash point temperature of the insulating oil to be evaluated includes: Based on the SMILES symbol of the insulating oil to be evaluated, obtain the molar refractive index, electronegativity state value, and highest eigenvalue topological index of the insulating oil to be evaluated. Based on the molar refractive index, the electronegativity state value, and the highest eigenvalue topological index, combined with the flash point relation... The flash point temperature is obtained through calculation; wherein, These are the flash point temperature, the electronegativity state value, and the molar refractive index, respectively. For the two highest eigenvalue topological indices.

5. The method for evaluating the flame-retardant properties of insulating oil as described in any one of claims 1 to 3, characterized in that, The process of calculating the initial cracking Gibbs free energy of the insulating oil to be evaluated based on its molecular structure information includes: Using the molecular structure information of the insulating oil to be evaluated as input parameters, the initial pyrolysis simulation calculation is performed using the ReaxFF reaction kinetics simulation model, and the forward and reverse reaction rate constants are obtained by combining the reaction frequency statistical algorithm. The initial pyrolysis Gibbs free energy is obtained by calculating based on the forward and reverse reaction rate constants.

6. The method for evaluating the flame-retardant properties of insulating oil as described in any one of claims 1 to 3, characterized in that, The process of calculating the number of pyrolysis combustible gas molecules in the insulating oil to be evaluated includes: Using the molecular structure information of the insulating oil to be evaluated as input parameters, an initial pyrolysis simulation calculation is performed using the ReaxFF reaction kinetics simulation model. Pyrolysis molecules are screened according to the dynamic bond level threshold and molecular lifetime filtering threshold, and the number of qualified pyrolysis molecules is counted as the number of pyrolysis combustible gas molecules.

7. The method for evaluating the flame retardant properties of insulating oil as described in claim 6, characterized in that, The dynamic bond level threshold is 0.55~0.65; the molecular lifetime filtration threshold is 100fs~500fs.

8. A device for evaluating the flame retardant properties of insulating oil, characterized in that, include: The molecular analysis module is used to calculate the flash point temperature, initial cracking Gibbs free energy, and number of cracking combustible gas molecules of the insulating oil to be evaluated based on the molecular structure information of the insulating oil to be evaluated. The index calculation module is used to calculate and determine the flame retardancy index based on the flash point temperature, the initial cracking Gibbs free energy, and the number of cracked combustible gas molecules. The evaluation calculation module is used to compare the flame retardant index with a set index threshold to obtain the flame retardant performance evaluation result of the insulating oil to be evaluated.

9. A device for evaluating the flame retardant properties of insulating oil, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the method for evaluating the flame retardant properties of insulating oil as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that is executed to implement the steps of the method for evaluating the flame-retardant properties of insulating oil as described in any one of claims 1 to 7.

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