Alkylbenzene insulating oil degradation resistance evaluation method and computer readable storage medium

Abstract

The invention relates to the technical field of degradation performance analysis of alkylbenzene insulating oil, in particular to a degradation resistance evaluation method of alkylbenzene insulating oil and a computer readable storage medium. The method for evaluating the degradation resistance of the alkylbenzene insulating oil comprises the following steps: acquiring chemical components of a storage container of an alkylbenzene insulating material, the volume fraction of oxygen in a storage atmosphere, the moisture content in the alkylbenzene insulating material and the illumination intensity of the alkylbenzene insulating oil; obtaining the degradation resistance of the alkylbenzene insulating oil according to the chemical components of the storage container, the oxygen volume fraction in the storage atmosphere, the moisture content in the alkylbenzene insulating material and the illumination intensity on the alkylbenzene insulating oil. According to the method provided by the invention, the degradation resistance of the alkylbenzene insulating oil under the storage condition can be judged based on the storage environment factors, and the method has the advantages of high efficiency and reliable and accurate evaluation result.

Description

Technical Field

[0001] The present application relates to the technical field of degradation performance analysis of alkylbenzene insulating oil, and in particular to a method for evaluating the degradation resistance of alkylbenzene insulating oil and a computer-readable storage medium. Background Art

[0002] Alkylbenzene insulating oil has been widely used as the main insulating medium for submarine oil-filled cables and 500kV ultra-high voltage cables due to its good gas evolution, low viscosity and easy biodegradation. However, existing operating experience shows that after long-term operation of cables or long-term storage of alkylbenzene insulating oil, alkylbenzene insulating oil will age and decompose to varying degrees due to contact with environmental factors, resulting in deterioration of physical, chemical and electrical properties, affecting the safe and stable operation of oil-filled cables.

[0003] Therefore, the degradation resistance of alkylbenzene insulating oil can be judged through the storage environment factors of alkylbenzene insulating oil, which plays an important role in guiding the replacement of storage environment and judging the aging degree of alkylbenzene insulating oil. Summary of the invention

[0004] Based on this, the present application provides a method for evaluating the degradation resistance of alkylbenzene insulating oil and a computer-readable storage medium. The method provided in the present application can judge the degradation resistance of alkylbenzene insulating oil under the storage conditions based on the storage environment factors, and the method has the advantages of high efficiency and reliable and accurate evaluation results.

[0005] In a first aspect of the present application, a method for evaluating the degradation resistance of an alkylbenzene insulating oil is provided, comprising the following steps:

[0006] Obtaining the chemical composition of the storage container of the alkylbenzene insulating material, the oxygen volume fraction in the storage atmosphere, the moisture content in the alkylbenzene insulating material, and the light intensity on the alkylbenzene insulating oil;

[0007] The degradation resistance of the alkylbenzene insulating oil is obtained according to the chemical composition of the storage container, the volume fraction of oxygen in the storage atmosphere, the moisture content in the alkylbenzene insulating material and the light intensity on the alkylbenzene insulating oil.

[0008] In one embodiment, the degradation resistance of the alkylbenzene insulating oil is measured by a comprehensive degradation index D tot Sure;

[0009] The comprehensive degradation index D tot =Fs×Qs+(0.5×100×A+0.1)×Q A +0.05×M×Q M +F L ×Q L; Qs is the influencing factor of the chemical composition of the storage container, A is the volume fraction of oxygen in the storage atmosphere, Q A is the oxygen volume fraction influencing factor, M is the value of the moisture content in the alkylbenzene insulating material in μg / mL, Q M is the moisture content influencing factor, Q L is the light intensity influencing factor;

[0010] The value of Fs is determined by the chemical composition of the storage container, and the value of Fs satisfies one of the following characteristics:

[0011] (1) If the chemical composition of the storage container does not include metal elements, the value of Fs is 0.9;

[0012] (2) If the chemical composition of the storage container includes metal elements, the value of Fs is calculated by the value of N: N = N Cr +N Ni +N Mn -N Cu ; If N≤-20%, the value of Fs is 1; if -20%<N≤0%, the value of Fs is 0.8; if 0<N≤28%, the value of Fs is 0.6; if N>28%, the value of Fs is 0.4; N Cr is the mass percentage of Cr in the storage container, N Ni is the mass percentage of Ni in the storage container, N Mn is the mass percentage of Mn in the storage container, N Cu is the mass percentage of Cu in the storage container;

[0013] The F L The value of F is determined by the light intensity of the alkylbenzene insulating oil. L The value of satisfies one of the following characteristics:

[0014] (1) If the light intensity is ≤1000lux, the F L The value of is 0.2;

[0015] (2) If 1000lux<the light intensity≤10000lux, the F L The value of is 0.5;

[0016] (3) If the light intensity is greater than 10000 lux, the F L The value of is 1.

[0017] In one embodiment, the value of the storage container chemical composition influence factor Qs is 0.3;

[0018] Oxygen volume fraction influence factor Q A The value of is 0.4;

[0019] Moisture content influence factor Q M The value of is 0.2;

[0020] Light intensity influence factor Q L is 0.1.

[0021] In one embodiment, the comprehensive degradation index D tot The lower the value, the better the degradation resistance of the alkylbenzene insulating oil;

[0022] And / or, under the same storage time, the comprehensive degradation index D tot The lower the value of , the lower the degree of deterioration of the alkylbenzene insulating oil.

[0023] In one embodiment, the comprehensive degradation index D tot <3, indicating that the alkylbenzene insulating oil has a low degree of aging within a storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value ≤0.1 mgKOH / g, dielectric loss factor ≤2%, 5.5≤pH value≤7.

[0024] In one embodiment, if 3≤the comprehensive degradation index D tot ≤7, indicating that the alkylbenzene insulating oil has a medium degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: 0.1 mgKOH / g<acid value≤0.5 mgKOH / g, 2%<dielectric loss factor≤5%, 4.5≤pH value<5.5.

[0025] In one embodiment, if the comprehensive degradation index D tot >7, indicating that the alkylbenzene insulating oil has a high degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value >0.5 mgKOH / g, dielectric loss factor >5%, and pH value <4.5.

[0026] In one embodiment, the alkylbenzene insulating oil includes an alkylbenzene base oil and additives.

[0027] Wherein, the alkylbenzene base oil includes dodecylbenzene.

[0028] The additives include one or more of an antioxidant and a metal deactivator.

[0029] In one embodiment, the antioxidant includes one or more of an amine antioxidant and a phenolic antioxidant;

[0030] The metal deactivator includes one or more of benzotriazole and its derivatives and thiadiazole and its derivatives.

[0031] According to a second aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, at least one step of the method for evaluating the degradation resistance of alkylbenzene insulating oil described in any embodiment of the first aspect of the present application is implemented.

[0032] The method for evaluating the degradation resistance of alkylbenzene insulating oil provided in the present application has at least the following beneficial effects:

[0033] The evaluation method provided in the present application determines the degradation resistance of alkylbenzene insulating oil under storage environment factors by obtaining the chemical composition of the storage container of the alkylbenzene insulating material, the volume fraction of oxygen in the storage atmosphere, the moisture content in the alkylbenzene insulating material and the light intensity of the alkylbenzene insulating oil. The method is simple and efficient, and is consistent with the results of the actual aging resistance of the alkylbenzene insulating oil under the storage conditions. This plays an important role in guiding the replacement of the storage environment and determining the aging degree of the alkylbenzene insulating oil. In addition, it can also avoid the shortcomings of long test time and slow cycle in testing the aging degree of the alkylbenzene insulating material itself. DETAILED DESCRIPTION

[0034] The following is a further complete and clear description of the degradation resistance evaluation method of the alkylbenzene insulating oil and the computer-readable storage medium of the present application in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0037] In this application, "first aspect", "second aspect", "third aspect", "fourth aspect", "fifth aspect", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", "fifth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0038] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0039] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0040] The percentage contents involved in this application, unless otherwise specified, refer to mass percentage for solid-liquid mixing and solid-solid mixing, and refer to volume percentage for liquid-liquid mixing.

[0041] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0042] The temperature parameters in this application, unless otherwise specified, allow for both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows the temperature to fluctuate within the accuracy range of instrument control.

[0043] Insulating oil will come into contact with the environment during daily storage and use. There are factors in the environment that accelerate the aging of insulating oil: contact materials, atmosphere, water content and light, etc. The above environmental factors will accelerate the aging of insulating oil to varying degrees. For example, if alkylbenzene insulating oil is not tightly sealed during the transportation of new oil or long-term storage, a small amount of water and oxygen will inevitably invade from the outside, and alkylbenzene insulating oil will face the risk of moisture and accelerated aging. However, it is not clear how each environmental factor affects alkylbenzene insulating oil and the extent of its impact on alkylbenzene insulating oil, and it is also unclear how to further guide the storage of alkylbenzene insulating oil.

[0044] Based on this, the first aspect of the present application provides a method for evaluating the degradation resistance of alkylbenzene insulating oil, comprising the following steps:

[0045] Obtaining the chemical composition of the storage container of the alkylbenzene insulating material, the oxygen volume fraction in the storage atmosphere, the moisture content in the alkylbenzene insulating material, and the light intensity on the alkylbenzene insulating oil;

[0046] The degradation resistance of the alkylbenzene insulating oil is obtained according to the chemical composition of the storage container, the volume fraction of oxygen in the storage atmosphere, the moisture content in the alkylbenzene insulating material and the light intensity on the alkylbenzene insulating oil.

[0047] The evaluation method provided by the present application determines the degradation resistance of alkylbenzene insulating oil under storage environment factors by obtaining the chemical composition of the storage container of alkylbenzene insulating material, the oxygen volume fraction in the storage atmosphere, the moisture content in the alkylbenzene insulating material, and the light intensity of the alkylbenzene insulating oil. The method is simple and efficient, and is consistent with the results of the actual aging resistance of the alkylbenzene insulating oil under the storage conditions, which plays an important role in guiding the replacement of the storage environment and determining the aging degree of the alkylbenzene insulating oil. In addition, it can also avoid the disadvantages of long test time and slow cycle in testing the aging degree of the alkylbenzene insulating material itself.

[0048] In one example, the degradation resistance of the alkylbenzene insulating oil is measured by a comprehensive degradation index D tot Sure.

[0049] The comprehensive degradation index D tot =Fs×Qs+(0.5×100×A+0.1)×Q A +0.05×M×Q M +F L ×Q L ; Qs is the influencing factor of the chemical composition of the storage container, A is the volume fraction of oxygen in the storage atmosphere, Q A is the oxygen volume fraction influencing factor, M is the value of the moisture content in the alkylbenzene insulating material in μg / mL, Q M is the moisture content influencing factor, Q L is the factor affecting light intensity.

[0050] The value of Fs is determined by the chemical composition of the storage container: if the chemical composition of the storage container does not include metal elements, the value of Fs is 0.9.

[0051] If the chemical composition of the storage container includes metal elements, the value of Fs is calculated by the value of N: N=N Cr +N Ni +N Mn -N Cu .

[0052] If N≤-20%, the value of Fs is 1.

[0053] If -20%<N≤0%, the value of Fs is 0.8.

[0054] If 0<N≤28%, the value of Fs is 0.6.

[0055] If N>28%, the value of Fs is 0.4.

[0056] N Cris the mass percentage of Cr in the storage container, N Ni is the mass percentage of Ni in the storage container, N Mn is the mass percentage of Mn in the storage container, N Cu is the mass percentage of Cu in the storage container.

[0057] The present applicant has found that whether a storage container contains metal elements plays an important role in the degradation resistance of alkylbenzene insulating oil.

[0058] Among them, the copper element included in the storage container acts as a catalyst when it contacts the alkylbenzene insulating oil, which can accelerate chemical reactions such as oxidation of the alkylbenzene insulating oil, making it more susceptible to aging and deterioration. When the storage container of the alkylbenzene insulating oil contains Cr, Ni or Mn, the above-mentioned metal elements cooperate with each other to form a dense chromium oxide passivation film on the surface of the storage container, and enhance the corrosion resistance of the container through Ni to prevent impurities from entering the oil, and further play a deoxidation and desulfurization role through Mn, reducing impurities that can promote oxidation and sulfidation reactions of the insulating oil, thereby delaying the aging of the alkylbenzene insulating oil. Therefore, in the evaluation method provided by the present application, the chemical composition of the storage container is integrated to provide different Fs values.

[0059] The calculation of the Fs value of this application is explained below in combination with the chemical compositions of several commonly used storage container materials.

[0060] (1) Acid-resistant rubber. Acid-resistant rubber uses synthetic rubber as its main raw material, such as chloroprene rubber, butyl rubber, ethylene-propylene rubber, etc. The molecular structure of these rubbers is mainly composed of non-metallic elements such as carbon, hydrogen, oxygen, and chlorine, and does not contain any metal elements. Therefore, when the material of the storage container of alkylbenzene insulating oil is acid-resistant rubber, its Fs value is 0.9.

[0061] (2) Pure copper or high copper alloy. The mass percentage of Cu in pure copper is ≥99.7%. The mass percentage of Cu in high copper alloy is 94%~99.3%. Therefore, N of pure copper or high copper alloy is less than -20%. Therefore, when the material of the storage container of alkylbenzene insulating oil is pure copper or high copper alloy, its Fs value is 1.

[0062] (3) Q235 steel. The mass percentage of Mn in Q235 steel is 0.3%~0.8%. The contents of Cr, Ni and Cu are approximately 0%. Therefore, the N value range of Q235 steel is: -20%<N≤0%. Therefore, when the material of the storage container of alkylbenzene insulating oil is Q235 steel, its Fs value is 0.8.

[0063] (4) 304 stainless steel. According to GB / T 20878-2007, the mass percentage of Cr in 304 stainless steel is 18%~22%, the mass percentage of Ni is 8%~11%, the mass percentage of Mn is ≤2%, and the mass percentage of Cu is ≤0.075%. Therefore, the N value range of 304 stainless steel is: 25.925%≤N≤35%. Therefore, when the material of the storage container of alkylbenzene insulating oil is Q235 steel, its Fs value is 0.6 or 0.4.

[0064] (5) 316L stainless steel. According to GB / T 20878-2007, the mass percentage of Cr in 316L stainless steel is 16%~18%, the mass percentage of Ni is 10%~14%, the mass percentage of Mn is ≤2%, and the mass percentage of Cu is ≤0.75%. Therefore, the N value range of 316L stainless steel is: 25.25%≤N≤34%. Therefore, when the material of the storage container of alkylbenzene insulating oil is 316L stainless steel, its Fs value is 0.6 or 0.4.

[0065] The F L The value of F is determined by the light intensity of the alkylbenzene insulating oil. L The value of satisfies one of the following characteristics:

[0066] (1) If the light intensity is ≤1000lux, the F L The value of is 0.2.

[0067] (2) If 1000lux<the light intensity≤10000lux, the F L The value of is 0.5.

[0068] (3) If the light intensity is greater than 10000 lux, the F L The value of is 1.

[0069] The aging process and degree of oil under different light intensities are different. The present application found that when the light intensity is ≤1000lux, the aging of alkylbenzene insulating oil under this light intensity is relatively slow; when 1000lux<the light intensity≤10000lux, the aging of alkylbenzene insulating oil under this light intensity is moderate; when the light intensity is>10000lux, the aging of alkylbenzene insulating oil under this light intensity is relatively fast. Different empirical coefficients F are given to alkylbenzene insulating oil under different light intensities. L Judging its aging performance can make the evaluation method of the present application more in line with actual conditions and provide a more reliable reference for the storage of alkylbenzene insulating oil.

[0070] In one example, the storage container chemical composition impact factor Qs has a value of 0.3.

[0071] In one example, the oxygen volume fraction affects the factor Q A The value of is 0.4.

[0072] In one example, the moisture content affects the factor Q M The value of is 0.2.

[0073] In one example, the light intensity influence factor Q L is 0.1.

[0074] The evaluation method provided in this application transforms complex environmental factors into a computable comprehensive degradation index D tot The index can directly reflect the degree of deterioration of alkylbenzene insulating oil due to storage environment factors. Therefore, it can be intuitively judged how long the alkylbenzene insulating oil is stored under the storage environment; and the degree of deterioration of the same alkylbenzene insulating oil under different storage environments under the same storage time.

[0075] In one example, the comprehensive degradation index D tot The lower the value of, the better the degradation resistance of the alkylbenzene insulating oil. It can be understood that the same alkylbenzene insulating oil is stored in different environments, if the comprehensive degradation index D of one storage environment is tot The lowest value indicates that the alkylbenzene insulating oil has better anti-degradation performance under the storage environment and a longer storage time. Therefore, the evaluation method provided in this application plays an important role in guiding and screening the storage environment of alkylbenzene insulating oil.

[0076] In one example, under the same storage time, the comprehensive degradation index D tot The lower the value of , the lower the degree of deterioration of the alkylbenzene insulating oil. It can be understood that the same alkylbenzene insulating oil is stored in different storage environments for the same time. If the comprehensive degradation index D of one storage environment is tot The lowest value indicates that the alkylbenzene insulating oil has the lowest degree of deterioration under this storage condition.

[0077] In one example, if the comprehensive degradation index D tot <3, indicating that the alkylbenzene insulating oil has a low degree of aging within a storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value ≤0.1 mgKOH / g, dielectric loss factor ≤2%, 5.5≤pH value≤7.

[0078] In one example, if 3≤the comprehensive degradation index D tot≤7, indicating that the alkylbenzene insulating oil has a medium degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: 0.1 mgKOH / g<acid value≤0.5 mgKOH / g, 2%<dielectric loss factor≤5%, 4.5≤pH value<5.5.

[0079] In one example, if the comprehensive degradation index D tot >7, indicating that the alkylbenzene insulating oil has a high degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value >0.5 mgKOH / g, dielectric loss factor >5%, and pH value <4.5.

[0080] This application is based on the comprehensive degradation index D tot The degradation resistance of alkylbenzene insulating oil is evaluated. At this time, the aging degree of the same alkylbenzene insulating oil under different storage environments under the same storage time can be judged. Among them, when the comprehensive degradation index D of alkylbenzene insulating oil is tot When 3≤the comprehensive degradation index D of alkylbenzene insulating oil, it indicates that the aging degree of alkylbenzene insulating oil is low and it can be used normally. tot When the comprehensive degradation index D of the alkylbenzene insulating oil is less than 7, it indicates that the alkylbenzene insulating oil is moderately aged and needs to be further replaced. tot When it is greater than 7, it indicates that the alkylbenzene insulating oil is highly aged and has severely deteriorated and cannot be used normally.

[0081] In one example, the alkylbenzene insulating oil includes an alkylbenzene base oil and an additive;

[0082] Wherein, the alkylbenzene base oil includes dodecylbenzene.

[0083] The additives include one or more of an antioxidant and a metal deactivator.

[0084] The evaluation method provided in this application is applicable to various alkylbenzene insulating oils and has good universality.

[0085] In one example, the antioxidant includes one or more of an amine antioxidant and a phenolic antioxidant.

[0086] For example, the phenolic antioxidant includes one or more of 2,6-di-tert-butyl-p-cresol, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 2,6-di-tert-butylphenol.

[0087] Illustratively, the amine antioxidant includes one or more of N-phenyl-α-naphthylamine and its derivatives and diphenylamine and its derivatives.

[0088] The metal deactivator includes one or more of benzotriazole and its derivatives and thiadiazole and its derivatives.

[0089] According to a second aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, at least one step of the method for evaluating the degradation resistance of alkylbenzene insulating oil described in any example of the first aspect of the present application is implemented.

[0090] It can be understood that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0091] The following further specific examples are provided to explain the present application in detail. It should also be understood that the following examples are only used to further explain the present application and cannot be understood as limiting the scope of protection of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application belong to the scope of protection of the present application. The specific process parameters of the following embodiments are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not necessarily limited to the specific values ​​of the embodiments below.

[0092] Example 1

[0093] The alkylbenzene insulating oil is stored for 5 years. The material of the storage container is: 316L stainless steel (N=N Cr +N Ni +N Mn -N Cu =30%), the water content of alkylbenzene insulating oil is 20μg / mL, the storage conditions are: light shielding (light intensity ≤1000lux), and the storage atmosphere is vacuum nitrogen (the volume fraction of oxygen in the storage atmosphere is 0%).

[0094] The comprehensive degradation index D is calculated according to the degradation resistance evaluation method of the alkylbenzene insulating oil of the present application. tot :

[0095]

[0096] The comprehensive degradation index D is calculated tot <3.

[0097] Example 2

[0098] The alkylbenzene insulating oil was stored for 5 years. The material of the storage container was copper (N≤-20%). The water content of the alkylbenzene insulating oil was 100 μg / mL. The storage conditions were: light intensity 10000 lux, and the storage atmosphere was air (the volume fraction of oxygen in the storage atmosphere was 21%).

[0099] The comprehensive degradation index D is calculated according to the degradation resistance evaluation method of the alkylbenzene insulating oil of the present application. tot :

[0100]

[0101] Calculated to obtain 3≤the comprehensive degradation index D tot ≤7.

[0102] Example 3

[0103] The alkylbenzene insulating oil was stored for 5 years. The material of the storage container was copper (N≤-20%). The water content of the alkylbenzene insulating oil was 240 μg / mL. The storage conditions were: light intensity 20000 lux, and the storage atmosphere was air (the volume fraction of oxygen in the storage atmosphere was 21%).

[0104] The comprehensive degradation index D is calculated according to the degradation resistance evaluation method of the alkylbenzene insulating oil of the present application. tot :

[0105]

[0106] The comprehensive degradation index D is calculated tot >7.

[0107] The comprehensive degradation index D of Example 1 to Example 3 tot It is found that under different storage environments, the degradation and aging properties of the alkylbenzene insulating oils of Examples 1 to 3 gradually increase, that is, their degradation resistance gradually decreases.

[0108] After being stored for five years, the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oils of Examples 1 to 3 were tested respectively, and the corresponding test results are shown in Table 1.

[0109] Table 1

[0110]

[0111] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solution of the present application in detail, but it cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A method for evaluating the degradation resistance of alkylbenzene insulating oil, characterized in that: The following steps are involved: Obtaining the chemical composition of the storage container of the alkylbenzene insulating material, the oxygen volume fraction in the storage atmosphere, the moisture content in the alkylbenzene insulating material, and the light intensity on the alkylbenzene insulating oil; The degradation resistance of the alkylbenzene insulating oil is obtained according to the chemical composition of the storage container, the volume fraction of oxygen in the storage atmosphere, the moisture content in the alkylbenzene insulating material and the light intensity on the alkylbenzene insulating oil.

2. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 1, characterized in that: The degradation resistance of the alkylbenzene insulating oil is measured by the comprehensive degradation index D tot Sure; The comprehensive degradation index D tot =Fs×Qs+(0.5×100×A+0.1)×Q A +0.05×M×Q M +F L ×Q L ; Qs is the influencing factor of the chemical composition of the storage container, A is the volume fraction of oxygen in the storage atmosphere, Q A is the oxygen volume fraction influencing factor, M is the value of the moisture content in the alkylbenzene insulating material in μg / mL, Q M is the moisture content influencing factor, Q L is the light intensity influencing factor; The value of Fs is determined by the chemical composition of the storage container, and the value of Fs satisfies one of the following characteristics: (1) If the chemical composition of the storage container does not include metal elements, the value of Fs is 0.9; (2) If the chemical composition of the storage container includes metal elements, the value of Fs is calculated by the value of N: N = N Cr +N Ni +N Mn -N Cu ; If N≤-20%, the value of Fs is 1; if -20%<N≤0%, the value of Fs is 0.8; if 0<N≤28%, the value of Fs is 0.6; if N>28%, the value of Fs is 0.4; N Cr is the mass percentage of Cr in the storage container, N Ni is the mass percentage of Ni in the storage container, N Mn is the mass percentage of Mn in the storage container, N Cu is the mass percentage of Cu in the storage container; The F L The value of F is determined by the light intensity of the alkylbenzene insulating oil. L The value of satisfies one of the following characteristics: (1) If the light intensity is ≤1000lux, the F L The value of is 0.2; (2) If 1000lux<the light intensity≤10000lux, the F L The value of is 0.5; (3) If the light intensity is greater than 10000 lux, the F L The value of is 1.

3. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 2, characterized in that: The value of the chemical composition influence factor Qs of the storage container is 0.3; The oxygen volume fraction influence factor Q A The value of is 0.4; The moisture content affects the factor Q M The value of is 0.2; The light intensity influence factor Q L is 0.

1.

4. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 2 or 3, characterized in that: The comprehensive degradation index D tot The lower the value, the better the degradation resistance of the alkylbenzene insulating oil; And / or, under the same storage time, the comprehensive degradation index D tot The lower the value of , the lower the degree of deterioration of the alkylbenzene insulating oil.

5. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 4, characterized in that: If the comprehensive degradation index D tot <3, indicating that the alkylbenzene insulating oil has a low degree of aging within a storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value ≤0.1 mgKOH / g, dielectric loss factor ≤2%, 5.5≤pH value≤7.

6. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 4, characterized in that: If 3≤the comprehensive degradation index D tot ≤7, indicating that the alkylbenzene insulating oil has a medium degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: 0.1 mgKOH / g<acid value≤0.5 mgKOH / g, 2%<dielectric loss factor≤5%, 4.5≤pH value<5.

5.

7. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 4, characterized in that: If the comprehensive degradation index D tot >7, indicating that the alkylbenzene insulating oil has a high degree of aging within the storage period of 5 years, wherein the acid value, dielectric loss factor and pH value of the alkylbenzene insulating oil are: acid value >0.5 mgKOH / g, dielectric loss factor >5%, and pH value <4.

5.

8. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to any one of claims 1 to 3, characterized in that: The alkylbenzene insulating oil comprises an alkylbenzene base oil and an additive; Wherein, the alkylbenzene base oil includes dodecylbenzene.

9. The method for evaluating the degradation resistance of alkylbenzene insulating oil according to claim 8, characterized in that: The additives include one or more of an antioxidant and a metal deactivator.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, at least one step of the method for evaluating the degradation resistance of an alkylbenzene insulating oil according to any one of claims 1 to 9 is implemented.

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