Use of aryl ether compound as transformer fault diagnostic agent

Abstract

The application belongs to the technical field of power equipment fault diagnosis, and particularly relates to an application of aryl ether compounds as transformer fault diagnosis agents. The aryl ether compounds are added into transformer insulating oil as transformer fault diagnosis agents, during operation of the transformer, oil samples are periodically collected for monitoring, the diagnosis agents in the oil samples are analyzed, changes in the enantiomeric excess percentage are determined, and a quantitative relationship between the enantiomeric excess percentage of the diagnosis agents and the overheating fault energy is obtained; according to the sample collection time interval and the change rate of the enantiomeric excess percentage in the insulating oil, the transformer overheating temperature and the overheating duration are derived. The application method reflects the fault energy by monitoring the simple isomerization proportion change of the diagnosis agent, has fast response speed and high sensitivity, is simple to operate, can be combined with the existing oil analysis process, and provides a new technical means for realizing early warning and state evaluation of transformer faults.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power equipment fault diagnosis, and particularly relates to application of an aryl ether compound as a transformer fault diagnosis agent. BACKGROUND

[0002] The power transformer is a key equipment in the power grid system, and its operation state is directly related to the safety and stability of the entire power grid. At present, the fault monitoring means based on oil chromatographic analysis has problems such as hysteresis, incomplete diagnosis basis, long detection period, and the like, and it is difficult to realize early warning of the rapidly developing fault. In order to overcome the above technical bottlenecks, the field urgently needs a new type of fault monitoring method which can directly and quickly respond to fault energy. The ideal method should be able to utilize a signal carrier more sensitive to low energy earlier than the slow cracking process of insulating oil, so as to greatly advance the window period of fault warning. Therefore, developing a transformer insulating oil fault diagnosis method based on a new principle, which responds quickly and diagnoses clearly, has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0003] The purpose of the present application is to solve the above problems, and to provide application of an aryl ether compound as a transformer fault diagnosis agent, so as to realize rapid and sensitive early fault warning.

[0004] Specifically, the present application provides application of an aryl ether compound as a transformer fault diagnosis agent, the aryl ether compound has the following structure:

[0005]

[0006] Among them, the aryl ether compound is a chiral molecule, the main body skeleton chirality is R configuration or S configuration;

[0007] Among them, R is hydrogen, aryl or alkyl; R 1 is hydrogen, aryl or alkyl; R 2 is alkyl. At this time, the theoretical barrier isomerization energy barrier of the above aryl ether compound is 30-60 kJ / mol.

[0008] The above aryl ether compound is generated from a phenolic compound and a halogenated hydrocarbon compound under the condition of a base and a solvent, and the reaction formula can be:

[0009]

[0010] The phenolic compound is a chiral phenolic compound or a common phenolic compound with the structure of formula 1, R is hydrogen, aryl or alkyl, and R 1 is hydrogen, aryl or alkyl.

[0011] Halogenated hydrocarbon compound R 2 X is chlorine, bromine or iodine, R 2 is alkyl.

[0012] The base is an organic base or an inorganic base, such as one of triethylamine, potassium carbonate or cesium carbonate.

[0013] The solvent is a polar solvent, which can be one or more of tetrahydrofuran, acetonitrile, ethyl acetate, dichloromethane, N , N dimethylformamide.

[0014] The amount of each component relative to 1.0 mol of the phenolic compound is: 1.0-5.0 mol of the halogenated hydrocarbon compound, 1.0-3.0 mol of the base, and 10-2500 ml of the solvent.

[0015] The reaction can be carried out under an inert atmosphere or in an open air atmosphere, with the temperature controlled at 50-120°C, and the reaction time adjusted according to the type of substrate, usually 1-50 hours.

[0016] After the reaction is completed, the target diagnostic agent is obtained by a conventional separation and purification method (such as extraction, distillation, chromatography, etc.).

[0017] As a preferred solution, the application of the above-mentioned aryl ether compound as a transformer fault diagnostic agent includes: adding the aryl ether compound as a transformer fault diagnostic agent into transformer insulating oil to form an insulating oil diagnostic agent composition; periodically collecting an oil sample of the insulating oil diagnostic agent composition from the equipment during the operation of the transformer for monitoring, analyzing the diagnostic agent in the oil sample by using a chiral chromatographic analysis technology (such as chiral HPLC), measuring the change in the proportion of chiral isomers of the diagnostic agent, especially the change in the percentage of enantiomeric excess, obtaining a quantitative relationship between the percentage of enantiomeric excess of the diagnostic agent and the overheating fault energy; according to the sampling time interval and the change rate of the percentage of enantiomeric excess in the insulating oil, substituting into the quantitative relationship between the percentage of enantiomeric excess of the diagnostic agent and the overheating fault energy, deducing the overheating temperature and the overheating duration of the transformer.

[0018] As a preferred solution, the application of the above-mentioned aryl ether compound as a transformer fault diagnostic agent, R is phenyl; R 1 is hydrogen; and R 2 is alkyl.

[0019] As a preferred solution, the application of the above-mentioned aryl ether compound as a transformer fault diagnostic agent, R is phenyl; R 1 is hydrogen; and R 2 is propyl, at this time, the theoretical rotational isomerization energy barrier of the aryl ether compound is 40-43 kJ / mol, and the half-life is 150-250 h.

[0020] The aryl ether compound is added to the transformer insulating oil as a transformer fault diagnostic agent, and the addition amount is 0.01wt%-10wt% of the transformer insulating oil, preferably 0.1wt%-5wt%, and further preferably 0.1wt%-0.5wt%.

[0021] Compared with the prior art, the present application at least includes the following beneficial effects:

[0022] 1. The response mechanism is sensitive and efficient, and early and accurate early warning is realized

[0023] The application method directly reflects the transformer overheating fault energy by monitoring the ratio change (especially the enantiomeric excess percentage) of the chiral isomers of the diagnostic agent. The diagnostic agent undergoes configuration transformation under the action of thermal stress, and the kinetic behavior has a clear quantitative relationship with the fault energy. This method avoids the lag of traditional oil chromatographic analysis which relies on slow cracking products of insulating oil, is more sensitive to low-energy faults, can significantly advance the warning window period, and improves the timeliness and accuracy of fault identification.

[0024] 2. The operation process is simple and compatible with the existing operation and maintenance system

[0025] The diagnostic agent only needs to be added to the insulating oil in a trace amount (0.01wt%-10wt%), without the need to modify the internal structure of the transformer. The sampling and analysis process can be seamlessly embedded in the existing oil monitoring system, and rapid detection can be realized through conventional chiral chromatographic technology (such as chiral HPLC), without the need to introduce complex equipment or additional operation steps, greatly reducing the difficulty and cost of technology popularization.

[0026] 3. High diagnostic accuracy, supporting quantitative evaluation of fault energy

[0027] By establishing a quantitative relationship between the enantiomeric excess percentage and the overheating fault energy, combined with the time interval data of regular sampling, the fault temperature and duration can be accurately back calculated, providing reliable data support for fault location, severity evaluation and maintenance decision-making.

[0028] 4. Excellent material compatibility, ensuring the intrinsic performance of insulating oil

[0029] Experiments show that within the recommended addition amount range, the diagnostic agent has little effect on the key parameters (such as density, kinematic viscosity, breakdown voltage, etc.) of the insulating oil, and each index still meets the requirements of GB2536-2011 standard, showing good engineering applicability and safety.

[0030] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and to be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. Attached Figure Description

[0031] Figure 1 The 1H NMR spectrum of the aryl ether compound of Example 1 is shown;

[0032] Figure 2 The carbon NMR spectra of the aryl ether compounds of Example 1 are shown;

[0033] Figure 3 The quantitative relationship between the enantiomeric excess percentage and the overheating failure energy of the aryl ether compounds in Example 1 is shown.

[0034] Figure 4 The 1H NMR spectrum of the aryl ether compound in Example 2 is shown;

[0035] Figure 5 The carbon NMR spectra of the aryl ether compounds in Example 2 are shown;

[0036] Figure 6 The quantitative relationship between the enantiomeric excess percentage and the overheating failure energy of the aryl ether compounds in Example 2 is shown.

[0037] Figure 7 The effect of the amount of transformer fault diagnostic agent added on the density of insulating oil at 20℃ is shown.

[0038] Figure 8 The effect of the amount of transformer fault diagnostic agent added on kinematic viscosity at 40°C is shown. Detailed Implementation

[0039] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0040] Example 1

[0041] This embodiment provides an application of aryl ether compounds as transformer fault diagnostic agents.

[0042] The structural formula of this aryl ether compound is as follows:

[0043]

[0044] Its theoretical barrier to isomerism is ΔG = 41.4 kJ / mol, and its half-life is 209 h.

[0045] It is prepared by the following method:

[0046] Add the following ingredients sequentially to a 100mL round-bottom flask:S 1-Binaphthol (2.86 g, 10 mmol), 1-bromopropane (3.63 g, 30 mmol), and cesium carbonate (Cs₂CO₃, 6.5 g, 20 mmol) were added, along with 20 mL of acetonitrile as a solvent. The reaction mixture was stirred at 50°C for 48 hours. After the reaction was complete, the system was cooled to room temperature. Subsequently, 50 mL of dichloromethane was added to the reaction solution, and insoluble solid impurities were removed by filtration. The filtrate was concentrated and purified by column chromatography (eluent: petroleum ether → ethyl acetate / petroleum ether = 1:100) to obtain the target product in 90% yield.

[0047] The aryl ether compound was subjected to proton NMR spectroscopy using conventional methods. Figure 1 ), nuclear magnetic resonance carbon spectrum ( Figure 2 The analysis yielded the following results:

[0048] Hydrogen spectrum: 1 H NMR (400 MHz, chloroform- d ) δ 7.97 (d, J = 9.0 Hz, 2H), 7.89(dd, J 0.61 (m, 6H).

[0049] Carbon spectrum: 13 C NMR (101 MHz, Chloroform-d) δ 154.6, 134.4, 129.3, 129.1,127.9, 126.2, 125.6, 123.5, 120.7, 115.9, 71.3, 22.8, 10.3.

[0050] The aryl ether compound is added into transformer insulating oil as a transformer fault diagnostic agent at a proportion of 0.2wt%, to form an insulating oil diagnostic agent composition; during operation of the transformer, insulating oil diagnostic agent composition samples are periodically collected from the equipment for monitoring, the diagnostic agent in the oil sample is analyzed by chiral HPLC, the proportion change of chiral isomers thereof, especially the change of enantiomeric excess percentage, is determined, to obtain a quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy; according to the sample collection time interval and the change rate of the enantiomeric excess percentage in the insulating oil, the quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy is substituted, to derive the transformer overheating temperature and overheating duration.

[0051] The enantiomeric excess percentage of the diagnostic agent under constant temperature conditions of 170℃, 180℃ and 190℃ shows a decreasing trend with time, and respectively meets the following rules: 170 o C: y=-0.0141x+1.0116, R 2 =0.9919; 180 o C: y=-0.0179x+1.0052, R 2 =0.986; 190 o C: y=-0.0499x+0.9393, R 2 =0.9607. Figure 3 The quantitative relationship between the overheating fault energy and the diagnostic agent response is shown.

[0052] Example 2

[0053] The present embodiment provides an application of an aryl ether compound as a transformer fault diagnostic agent.

[0054] The structural formula of the aryl ether compound is as follows:

[0055]

[0056] The theoretical rotational isomerization energy barrier thereof is 39.4kJ / mol, and the half-life is 31h.

[0057] Prepared by the following method:

[0058] A 100mL round-bottom flask is sequentially added with S2.86 g (10 mmol) of bis(naphthol), 4.23 g (30 mmol) of iodomethane, and 6.5 g (20 mmol) of cesium carbonate were added, along with 20 mL of acetonitrile as a solvent. The reaction mixture was stirred at 50°C for 48 hours. After the reaction was complete, the system was cooled to room temperature. Subsequently, 50 mL of dichloromethane was added to the reaction solution, and insoluble solid impurities were removed by filtration. The filtrate was concentrated and purified by column chromatography (eluent: petroleum ether → ethyl acetate / petroleum ether = 1:100) to give the target product in 80% yield.

[0059] The target product was subjected to proton nuclear magnetic resonance spectroscopy using conventional methods. Figure 4 ), carbon spectrum ( Figure 5 The analysis yielded the following results:

[0060] Hydrogen spectrum: 1 H NMR (400 MHz, chloroform-d) δ 7.97 (d, J = 9.0 Hz, 2H), 7.86 (dt, J = 8.2, 0.9 Hz, 2H), 7.45 (d, J = 9.0 Hz, 2H), 7.31 (m, 2H), 7.20 (m,2H), 7.10 (m, 2H), 3.76 (s, 6H).

[0061] Carbon spectrum: 13 C NMR (101 MHz, chloroform-d) δ 155.1, 134.1, 129.5, 129.3,128.04, 126.4, 125.4, 123.6, 119.7, 114.3, 57.0.

[0062] The aryl ether compound was added to the transformer insulating oil at a ratio of 0.2 wt% as a transformer fault diagnostic agent to form an insulating oil diagnostic agent composition. During transformer operation, oil samples of the insulating oil diagnostic agent composition were periodically collected from the equipment for monitoring. The diagnostic agent in the oil samples was analyzed using chiral HPLC to determine the changes in the proportion of its chiral isomers, especially the changes in the enantiomeric excess percentage, and to obtain a quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy. Based on the sample collection time interval and the rate of change of the enantiomeric excess percentage in the insulating oil, these values ​​were substituted into the quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy to derive the transformer overheating temperature and overheating duration.

[0063] Under isothermal conditions of 170℃, 180℃, and 190℃, the enantiomeric excess percentage of the diagnostic reagent showed a decreasing trend over time, conforming to the following patterns: 170℃...o C: y = -0.0296x + 1.0103, R 2 =0.9832; 180 o C: y = -0.0319x + 0.9915, R 2 =0.9807; 190 o C: y = 1.2701e -0.247x R 2 =0.9917 ( Figure 6 The quantitative relationship between overheating fault energy and diagnostic agent response was presented.

[0064] Test Example 1

[0065] The aryl ether compounds from Examples 1 and 2 were added to the insulating oil at 0.2 wt% (ratios of 5:1, 5:2, 5:3, 5:4, 1:1, 1:2, 1:3, 1:4, and 1:5, respectively). To verify its effectiveness, laboratory simulated fault tests were conducted. Multiple oil samples were placed at different temperatures (simulating overheating faults of varying intensities), and samples were periodically taken and their chiral purity analyzed. The results showed that the chiral purity of the aryl ether compounds (e.g., the enantiomeric excess percentage, i.e., the ee value) decreased systematically with increasing heating time, and the rate of decrease varied at different temperatures. This demonstrates that by monitoring this ratio change, the magnitude and cumulative effect of thermal stress (fault energy) experienced by the insulating oil over time can be effectively reflected, thereby enabling early warning and diagnosis of faults.

[0066] Test Example 2

[0067] The aryl ether compounds from Example 1 were weighed and added to transformer insulating oil at concentrations ranging from 0.1 wt% to 20 wt%. Their effects on the insulating oil density were tested and compared with current insulating oil standards. Experimental results ( Figure 7 Table 1 shows that, under the condition that the amount of diagnostic agent added is not higher than 10 wt%, the density range of the insulating oil is small, and it still meets the standard limit in GB 2536-2011 "Unused Mineral Insulating Oil for Electrical Fluid Transformers and Switches", that is, the density at 20°C is not higher than 0.895 g / cm³. 3 It shows good compatibility.

[0068] Table 1

[0069]

[0070] Test Example 3

[0071] The aryl ether compounds from Example 1 were weighed and added to transformer insulating oil at concentrations ranging from 0.1 wt% to 20 wt%. Their effects on kinematic viscosity were tested and compared with current insulating oil standards. Experimental results (Figure 8 The experimental results (Table 2) show that when the diagnostic agent is added in an amount of not more than 20wt%, the change range of the kinematic viscosity of the insulating oil is small, and still meets the standard limit value in GB 2536-2011 "Electrical fluids - Mineral insulating oils for transformers and switchgears - Unused", i.e. the kinematic viscosity at 40°C is not higher than 12mm 2 / s, showing good compatibility.

[0072] Table 2

[0073]

[0074] Test Example 4

[0075] The aryl ether compound of Example 1 is weighed and added into the transformer insulating oil in an amount of 0.1wt%-5wt%, and the effects of the aryl ether compound on the breakdown voltage, dielectric loss and volume resistivity are tested, and compared with the current insulating oil standard. The experimental results (Table 3) show that when the diagnostic agent is added in an amount of not more than 5%, the change range of the breakdown voltage, dielectric loss and volume resistivity of the insulating oil diagnostic agent composition is small, and still meets the standard limit value in GB 2536-2011 "Electrical fluids - Mineral insulating oils for transformers and switchgears - Unused", i.e. the breakdown voltage is not less than 70kV, the dielectric loss (90°C) is not higher than 0.5%, and the volume resistivity is not less than 10x10 10 Ω·m, showing good compatibility.

[0076] Table 3

[0077]

[0078] The above only is the preferred embodiment of the present application, and does not limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The application of an aryl ether compound as a transformer fault diagnostic agent, characterized in that, The aryl ether compound has one of the following two structural formulas: 。 2. The application of the aryl ether compound according to claim 1 as a transformer fault diagnostic agent, characterized in that, The application includes: adding the aryl ether compound as a transformer fault diagnostic agent to transformer insulating oil to form an insulating oil diagnostic agent composition; During transformer operation, oil samples of the insulating oil diagnostic agent composition are periodically collected from the equipment for monitoring. Chiral chromatography is used to analyze the diagnostic agent in the oil samples, and the changes in the proportion of its chiral isomers are measured, including the changes in the enantiomeric excess percentage. A quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy is obtained. Based on the sample collection time interval and the rate of change of the enantiomeric excess percentage in the insulating oil, the quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy is substituted into the formula to derive the transformer overheating temperature and overheating duration.

3. The application of the aryl ether compound according to claim 1 as a transformer fault diagnostic agent, characterized in that, When the aryl ether compounds are added to transformer insulating oil as transformer fault diagnostic agents, the amount added is 0.01wt%-10wt% of the transformer insulating oil.

4. The application of the aryl ether compounds according to claim 3 as transformer fault diagnostic agents, characterized in that, When the aryl ether compounds are added to transformer insulating oil as transformer fault diagnostic agents, the amount added is 0.1wt%-5wt% of the transformer insulating oil.

5. The application of the aryl ether compound according to claim 4 as a transformer fault diagnostic agent, characterized in that, When the aryl ether compounds are added to transformer insulating oil as transformer fault diagnostic agents, the amount added is 0.1wt%-0.5wt% of the transformer insulating oil.

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