A diagnostic agent suitable for early warning of overheat failure of power oil charging equipment

Abstract

The application belongs to the technical field of power equipment fault diagnosis, and particularly relates to a diagnostic agent suitable for overheat fault early warning of power oil-filled equipment. R The main body skeleton is in a configuration or S The main body skeleton is in a configuration or 1 R is hydrogen, aryl or alkyl; R 2 R is hydrogen, aryl or alkyl; R 2 R is alkyl. The application has the following beneficial effects: the diagnostic agent can be applied to the field of power equipment fault early warning; the early warning mechanism is based on low-energy barrier response, and early fault warning can be realized; the diagnostic principle is based on atropisomerism effect, the reaction path is clear, and a quantitative analysis model can be easily established; the diagnostic agent has good compatibility with insulating oil, insulating paper and metal materials, and does not affect normal operation of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of power equipment fault diagnosis technology, specifically relating to a diagnostic agent suitable for early warning of overheating faults in power oil-filled equipment. Background Technology

[0002] Power transformers are key equipment in power grid systems, and their operating status directly affects the safety and stability of the entire power grid.

[0003] Currently, the fault assessment system for oil-filled equipment based on oil chromatography analysis is widely considered one of the most effective fault monitoring methods. However, this technology has shown significant bottlenecks in its application to fault early warning of large-scale oil-filled equipment, particularly in achieving timely and effective early warning of rapidly developing acute faults. Specifically, existing technologies mainly have the following limitations:

[0004] First, using the decomposition gas of insulating oil as a fault diagnosis signal has a certain time lag. Insulating oil itself has a dual nature: on the one hand, it has excellent insulation and heat dissipation properties; on the other hand, its chemical bonds are stable, and the energy required for decomposition is as high as hundreds of kJ / mol. This means that when insulating oil decomposition produces gas, it indicates that the equipment fault is already quite serious, making it impossible to provide effective early warning in the very early stages of a fault. Second, existing oil chromatography diagnostic criteria suffer from incomplete coding and unclear diagnostic mechanisms. Due to the complex composition of insulating oil and the incomplete diagnostic criteria, the accurate judgment of fault type and severity is limited.

[0005] To effectively improve the operational reliability of large oil-filled equipment and curb deflagration accidents, it is urgent to develop new early warning and diagnostic agents for faults that can provide reliable early warning and diagnosis at the very early stage of a fault, thus ensuring the safe and stable operation of the equipment. Summary of the Invention

[0006] The purpose of this invention is to solve the above problems and provide a novel transformer insulating oil fault diagnostic agent, which has the characteristics of being sensitive to fault energy, having high safety, and having good compatibility with insulating oil, and can be used for early warning and diagnosis of transformer faults.

[0007] Therefore, the present invention provides a diagnostic agent suitable for overheating fault early warning in power oil-filled equipment, the diagnostic agent having the following structure:

[0008]

[0009] The diagnostic agent is a chiral molecule with a main chiral backbone. R configuration or S Configuration;

[0010] Wherein, R is hydrogen, aryl, or alkyl; R 1 It is hydrogen, aryl, or alkyl; R 2R is hydrogen, aryl or alkyl.

[0011] The above diagnostic agent is a kind of chiral diether organic compound with atropisomerism, the molecular structure of the compound is designed based on the antioxidant commonly used in insulating oil, has the following characteristics: the compound does not contain other heteroatoms except oxygen, avoiding the risk of equipment corrosion; it is liquid at room temperature and normal pressure, and has good compatibility with insulating oil; it has atropisomerism effect, the isomerization energy barrier is between 30-60 kJ / mol, the half-life of the diagnostic agent is 10-20000 h, which can correspond to different fault energy levels.

[0012] The above diagnostic agent is an aryl ether compound generated by phenolic compound and halogenated hydrocarbon compound under the condition of base and solvent, the reaction formula can be:

[0013]

[0014] The phenolic compound is a chiral phenolic compound or a common phenolic compound with formula 1 structure, R is hydrogen, aryl or alkyl, R 1 is hydrogen, aryl or alkyl.

[0015] The halogenated hydrocarbon compound R 2 X, X is chlorine, bromine or iodine, R 2 is alkyl.

[0016] The base is an organic base or an inorganic base, such as one of triethylamine, potassium carbonate or cesium carbonate.

[0017] The solvent is a polar solvent, which can be one or more of tetrahydrofuran, acetonitrile, ethyl acetate, dichloromethane, N , N dimethylformamide.

[0018] The amount of other components relative to 1.0 mol of phenolic compound is: halogenated hydrocarbon compound 1.0-5.0 mol, base 1.0-3.0 mol, solvent 10-2500 milliliters.

[0019] The reaction can be carried out in an inert atmosphere or an open air atmosphere, the temperature is controlled at 50-120℃, the reaction time is adjusted according to the type of substrate, usually 1-50 hours.

[0020] After the reaction is completed, the target diagnostic agent is obtained by conventional separation and purification methods (such as extraction, distillation, chromatography, etc.).

[0021] As a preferred scheme, the above diagnostic agent suitable for overheat fault early warning of power oil-filled equipment, R is phenyl; R 1 is hydrogen; R 2 is alkyl.

[0022] According to the present application, in one specific embodiment, R is phenyl; R 1 is hydrogen; R 2 is methyl, in which case the resulting diagnostic agent has a theoretical barrier to rotation isomerization energy of 38-41 kJ / mol and a half-life of 10-50 h.

[0023] According to the present application, in one specific embodiment, R is phenyl; R 1 is hydrogen; R 2 is propyl, in which case the resulting diagnostic agent has a theoretical barrier to rotation isomerization energy of 40-43 kJ / mol and a half-life of 150-250 h.

[0024] As a preferred solution, the above-mentioned diagnostic agent for early warning of overheating failure of power oil-filled equipment, when added to the insulating oil as an additive, the amount of diagnostic agent added is 0.01wt%-10wt% of the insulating oil. It has been verified through experiments that within the range of 0.01wt%-10wt% of the added amount, the diagnostic agent has little effect on the key parameters of the insulating oil (such as density, kinematic viscosity, breakdown voltage, etc.), and each index still meets the requirements of GB2536-2011 standard, which embodies good engineering applicability and safety.

[0025] Compared with the prior art, the present application at least has the following beneficial effects:

[0026] 1. The design concept of the diagnostic agent is novel, which is first applied in the field of power equipment failure early warning.

[0027] The diagnostic agent proposed in the present application is a new type of material specially designed for early warning of overheating failure of power oil-filled equipment. Its design concept breaks through the traditional fault diagnosis method based on oil chromatographic analysis, and realizes early detection of equipment failure by introducing chiral molecules and barrier to rotation isomerization effect. This innovative design not only fills the technical gap in the field of early warning of power equipment failure, but also provides a new technical means for safe operation of power systems.

[0028] 2. The early warning mechanism is based on low-energy barrier response, which can realize early warning of failure.

[0029] The diagnostic agent of the present application has a low barrier to rotation isomerization energy (30-60 kJ / mol), which enables it to respond in the early stage of overheating failure of the equipment. This low-energy barrier response mechanism enables the diagnostic agent to capture the failure signal in time when the failure has not yet developed to a serious degree, thereby realizing early warning. Compared with the traditional oil chromatographic analysis method, the present application significantly improves the timeliness and accuracy of failure warning, which helps to prevent further deterioration of the failure.

[0030] 3. The diagnostic principle is based on the barrier to rotation isomerization effect, and the reaction path is clear, which is convenient for establishing a quantitative analysis model.

[0031] The diagnostic agent of the present application is based on the barrier rotation isomerization effect, and the molecular structure thereof will undergo isomerization reaction when excited by thermal energy. The reaction path is clear and predictable, so that by monitoring the isomerization degree of the diagnostic agent, the overheat fault energy and fault development degree of the equipment can be accurately evaluated. Based on this principle, researchers can establish a quantitative analysis model to realize accurate monitoring and diagnosis of faults, and provide a scientific basis for maintenance and management of power equipment.

[0032] 4. Similar structure to T501, good compatibility with insulating oil, insulating paper and metal materials, does not affect the normal operation of the equipment.

[0033] The diagnostic agent of the present application is similar in structure to the commonly used insulating oil antioxidant T501, and has good chemical stability and thermal stability. It appears as a liquid in insulating oil, and has good compatibility with insulating oil, insulating paper and metal materials, and does not adversely affect the normal operation of the equipment. In addition, the diagnostic agent does not contain other heteroatoms except oxygen, avoiding the risk of equipment corrosion and ensuring the safety and reliability of power equipment in long-term operation.

[0034] In summary, the present application provides an efficient and reliable solution for overheat fault warning of power oil-filled equipment through novel design concept, low-energy barrier response mechanism, clear reaction path and good material compatibility, which has significant practical value and promotion prospect.

[0035] 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, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The nuclear magnetic resonance hydrogen spectrum of the target product of Example 1 is shown;

[0037] Figure 2 The nuclear magnetic resonance carbon spectrum of the target product of Example 1 is shown;

[0038] Figure 3 The nuclear magnetic resonance hydrogen spectrum of the target product of Example 2 is shown;

[0039] Figure 4 The nuclear magnetic resonance carbon spectrum of the target product of Example 2 is shown. DETAILED DESCRIPTION

[0040] 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.

[0041] Example 1

[0042] This embodiment provides a diagnostic agent C1 suitable for overheating fault early warning in power oil-filled equipment, with the following structural formula:

[0043]

[0044] The theoretical barrier to isomerization of diagnostic reagent C1 is ΔG = 39.4 kJ / mol, and its half-life is 31 h.

[0045] Diagnostic reagent C1 was prepared by the following method:

[0046] Add the following ingredients sequentially to a 100mL round-bottom flask: S 2.86 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.

[0047] The target product was subjected to proton nuclear magnetic resonance spectroscopy using conventional methods. Figure 1 ), 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), 7.86 (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).

[0049] Carbon spectrum: 13C 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.

[0050] Therefore, the target product was obtained in this embodiment.

[0051] Example 2

[0052] This embodiment provides a diagnostic agent C2 suitable for overheating fault early warning in power oil-filled equipment, with the following structural formula:

[0053]

[0054] The theoretical barrier to isomerization of diagnostic reagent C2 is ΔG = 41.4 kJ / mol, and its half-life is 209 h.

[0055] Diagnostic reagent C2 was prepared by the following method:

[0056] 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.

[0057] The target product was subjected to proton nuclear magnetic resonance spectroscopy using conventional methods. Figure 3 ), carbon spectrum ( Figure 4 The analysis yielded the following results:

[0058] 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).

[0059] 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.

[0060] Therefore, the target product is obtained in the embodiment.

[0061] Test example

[0062] The present test example is used to prove that the diagnostic agent C2 is suitable for early warning of overheating fault of power oil-filled equipment.

[0063] During the operation of the transformer, oil samples (the addition amount of the diagnostic agent C2 is 0.2wt% of the insulating oil) are periodically collected from the equipment for monitoring, the diagnostic agent in the oil sample is analyzed by using a chiral chromatographic analysis technique, the proportion change of the chiral isomers of the diagnostic agent is measured, especially the change of the enantiomeric excess percentage, and a quantitative relationship between the enantiomeric excess percentage of the diagnostic agent and the overheating fault energy is obtained170 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.

[0064] 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, and by comparing the y and x values under the standard experimental conditions, the overheating temperature and the overheating duration of the transformer can be deduced, so that early warning of the fault of the oil-filled equipment is realized.

[0065] The above is only a preferred embodiment of the present application and is not used to 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. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A diagnostic agent suitable for early warning of overheating faults in oil-filled power equipment, characterized in that, The diagnostic agent has the following structure: The diagnostic agent is a chiral molecule with a main chiral backbone. R configuration or S Configuration; Wherein, R is phenyl; R 1 It is hydrogen; R 2 It is propyl.

2. The diagnostic agent for overheating fault early warning of power oil-filled equipment according to claim 1, characterized in that, The theoretical barrier to isomerization of the diagnostic agent is 40-43 kJ / mol.

3. The diagnostic agent for overheating fault early warning of power oil-filled equipment according to claim 1, characterized in that, The diagnostic agent has a half-life of 150-250 h.

4. The diagnostic agent for overheating fault early warning of power oil-filled equipment according to claim 1, characterized in that, When the diagnostic agent is added to the insulating oil as an additive, the amount of the diagnostic agent added is 0.01wt%-10wt% of the insulating oil.

Images