Compatibility evaluation method and device of transformer structure material and insulating liquid, electronic equipment and storage medium

Abstract

The invention discloses a compatibility evaluation method and device of a transformer structure material and an insulating liquid, electronic equipment and a storage medium, and belongs to the technical field of electrical insulation detection.The method comprises the steps that compatibility evaluation indexes of the transformer structure material and the insulating liquid are obtained; index characteristics corresponding to the compatibility evaluation indexes are calculated; wherein the index characteristics comprise trend intensity, fluctuation characteristics and mutation characteristics; according to the index characteristics, calculating a weight coefficient corresponding to each compatibility evaluation index, according to the index value of each compatibility evaluation index and the corresponding weight coefficient, calculating a compatibility comprehensive score of the transformer structure material and the insulating liquid, and then according to the compatibility comprehensive score, determining the compatibility of the transformer structure material and the insulating liquid. Therefore, by implementing the method, the problem that the compatibility of the transformer structure material and the insulating liquid cannot be evaluated in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical insulation detection, and in particular to a transformer structural material and insulating liquid compatibility evaluation method and device, electronic equipment and storage medium. BACKGROUND

[0002] In a transformer, the electrical insulating liquid plays the role of cooling, protection, insulation and state information carrier, and the structural material plays the role of mechanical support, insulation and sealing. The excellent cooperation of the electrical insulating liquid and the structural material can ensure the reliable electrical insulation of the transformer. In the operation process of the liquid-immersed transformer, in addition to the two main materials constituting the insulating liquid / cellulose paper insulation system, there are many other structural materials that can be in contact with the insulating liquid, such as: iron core, copper wire, resin, paint film, sealing material, adhesive tape, fastener, binding tape, etc. The transformer insulating liquid and the transformer structural material are mutually affected. The structural material will affect the performance of the insulating liquid, and at the same time, the insulating liquid will change the performance of the structural material under the action of temperature, oxygen, moisture and other substances. The use of incompatible materials will affect the insulation performance of the entire electrical insulation system, causing early damage or shortening the service life of the equipment.

[0003] Therefore, the compatibility of the insulating liquid and the structural material in the transformer not only affects the safe capacity and structural design of the transformer, but also directly relates to the service life and safe and stable operation of the electrical equipment. It is necessary to comprehensively evaluate the compatibility of the insulating liquid and the structural material in the transformer before being put into use. However, there is no systematic and scientific comprehensive evaluation method to guide the compatibility performance evaluation of the transformer structural material and the insulating liquid. SUMMARY

[0004] The present application provides a transformer structural material and insulating liquid compatibility evaluation method, device, electronic equipment and storage medium, which can solve the problem of unable to evaluate the compatibility performance of the transformer structural material and the insulating liquid in the prior art.

[0005] In order to solve the above technical problems, the present application provides a transformer structural material and insulating liquid compatibility evaluation method, comprising:

[0006] Obtaining a transformer structural material and insulating liquid compatibility evaluation index; wherein the compatibility evaluation index includes: the insulating liquid performance index and the structural material performance index obtained in the compatibility experiment of the transformer structural material and the insulating liquid; the insulating liquid performance index includes: the moisture, acid value, breakdown voltage, interfacial tension and dielectric loss factor of the insulating liquid; the structural material performance index includes: the mass volume change rate, mechanical strength change rate and dielectric property change rate of the structural material;

[0007] corresponding to each of the compatibility evaluation indexes are calculated; wherein, the index characteristics include: trend intensity, fluctuation characteristics and mutation characteristics;

[0008] According to the index characteristics, weight coefficients corresponding to each of the compatibility evaluation indexes are calculated, and a comprehensive compatibility score of the transformer structural material and the insulating liquid is calculated according to the index values of each of the compatibility evaluation indexes and the corresponding weight coefficients, and then a compatibility evaluation result of the transformer structural material and the insulating liquid is obtained according to the comprehensive compatibility score.

[0009] As a preferred solution, before the index characteristics corresponding to each of the compatibility evaluation indexes are calculated, the method further comprises:

[0010] According to a preset first standardization formula, the breakdown voltage and the interfacial tension are standardized, and according to a preset second standardization formula, the moisture, the acid value, the dielectric loss factor, the mass-volume change rate, the mechanical property change rate and the dielectric property change rate are standardized;

[0011] The first standardization formula is:

[0012]

[0013] The second standardization formula is:

[0014]

[0015] wherein, y ijt is the jth standardized compatibility evaluation index value of the ith sample at time t, x ijt is the jth compatibility evaluation index value of the ith sample at time t, x j is the jth compatibility evaluation index value of all samples in all periods.

[0016] As a preferred solution, according to the index characteristics, the weight coefficients corresponding to each of the compatibility evaluation indexes are calculated, including:

[0017] According to the characteristic indexes, the probability distribution of each of the compatibility indexes is calculated;

[0018] According to the probability distribution, the information entropy of each of the compatibility indexes is calculated;

[0019] According to the information entropy, the basic weight of each of the compatibility indexes is calculated, and the basic weight is modified according to the trend intensity;

[0020] According to the fluctuation characteristics and the mutation characteristics, the modified basic weight is adjusted and normalized to obtain the weight coefficients corresponding to each of the compatibility indexes.

[0021] As a preferred solution, the trend strength is calculated by the following formula:

[0022]

[0023] The fluctuation characteristic is calculated by the following formula, wherein represents the mean value of y ijt :

[0024]

[0025] The mutation feature A ij is calculated by the following formula:

[0026]

[0027] wherein τ ij is the trend strength, CV ij is the fluctuation characteristic, A ij is the normalized mutation feature, is the mean value of the sampling time point t, is the mean value of y ijt , a ij is the initial mutation feature value without normalization, Δt is the length of a single aging experiment period, T is the total number of periods, a j is the jth column data of a ij , y i,j,t+1 is the jth standardized compatibility evaluation index value in the ith sample at the time t+1, y i,j,t is the jth standardized compatibility evaluation index value in the ith sample at the time t, and y i,j,t-1 is the jth standardized compatibility evaluation index value in the ith sample at the time t-1.

[0028] As a preferred solution, the compatibility comprehensive score of the transformer structural material and the insulating liquid is calculated by the following formula:

[0029]

[0030] wherein S i is the compatibility comprehensive score of the transformer structural material and the insulating liquid, R ijt is the rank obtained by sorting the samples y ijt from small to large, is the index weight of the compatibility evaluation index k, and m is the number of compatibility evaluation indexes, is the dynamic RSR score of the ith sample, RSR (dynamic) is a data set containing dynamic RSR scores of all samples.

[0031] On the basis of the above-mentioned embodiments, another embodiment of the present application provides a device for evaluating the compatibility of transformer structural materials and insulating liquids, comprising: an evaluation index acquisition module, an index feature calculation module, and a compatibility evaluation module.

[0032] The evaluation index acquisition module is configured to acquire the compatibility evaluation indexes of the transformer structural materials and the insulating liquids, wherein the compatibility evaluation indexes comprise the insulating liquid performance indexes and the structural material performance indexes obtained in the compatibility experiment of the transformer structural materials and the insulating liquids, the insulating liquid performance indexes comprise the moisture, the acid value, the breakdown voltage, the interfacial tension, and the dielectric loss factor of the insulating liquid, and the structural material performance indexes comprise the mass-volume change rate, the mechanical strength change rate, and the dielectric property change rate of the structural material.

[0033] The index feature calculation module is configured to calculate the index features corresponding to the compatibility evaluation indexes, wherein the index features comprise the trend intensity, the fluctuation characteristics, and the mutation features.

[0034] The compatibility evaluation module is configured to calculate the weight coefficients corresponding to the compatibility evaluation indexes according to the index features, and calculate the compatibility comprehensive score of the transformer structural materials and the insulating liquids according to the index values of the compatibility evaluation indexes and the corresponding weight coefficients, and then obtain the compatibility evaluation result of the transformer structural materials and the insulating liquids according to the compatibility comprehensive score.

[0035] As a preferred scheme, before calculating the index features corresponding to the compatibility evaluation indexes, the device further comprises:

[0036] According to a preset first standardization formula, the breakdown voltage and the interfacial tension are standardized, and according to a preset second standardization formula, the moisture, the acid value, the dielectric loss factor, the mass-volume change rate, the mechanical property change rate, and the dielectric property change rate are standardized.

[0037] The first standardization formula is as follows:

[0038]

[0039] The second standardization formula is as follows:

[0040]

[0041] wherein y ijt is the jth standardized compatibility evaluation index value of the ith sample at time t, x ijt is the jth compatibility evaluation index value of the ith sample at time t, x j is the jth compatibility evaluation index value of all samples in all periods.

[0042] As a preferred solution, the weight coefficient corresponding to each compatibility evaluation index is calculated according to the index characteristics, including:

[0043] According to the characteristics index, the probability distribution of each compatibility index is calculated;

[0044] According to the probability distribution, the information entropy of each compatibility index is calculated;

[0045] According to the information entropy, the basic weight of each compatibility index is calculated, and the basic weight is corrected according to the trend intensity;

[0046] According to the fluctuation characteristics and mutation characteristics, the corrected basic weight is adjusted and normalized to obtain the weight coefficient corresponding to each compatibility index.

[0047] On the basis of the above-mentioned embodiments, another embodiment of the present application provides an electronic device, the device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor executing the computer program to realize the transformer structure material and insulation liquid compatibility evaluation method described in the above-mentioned embodiments of the application.

[0048] On the basis of the above-mentioned embodiments, another embodiment of the present application provides a storage medium, the storage medium comprising a stored computer program, wherein when the computer program is running, the device where the storage medium is located executes the transformer structure material and insulation liquid compatibility evaluation method described in the above-mentioned embodiments of the application.

[0049] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0050] The application provides a transformer structure material and insulating liquid compatibility evaluation method, and obtains a transformer structure material and insulating liquid compatibility evaluation index; wherein the compatibility evaluation index comprises insulating liquid performance indexes and structure material performance indexes obtained in a transformer structure material and insulating liquid compatibility experiment; the insulating liquid performance indexes comprise moisture, acid value, breakdown voltage, interfacial tension and dielectric loss factor of the insulating liquid; the structure material performance indexes comprise mass volume change rate, mechanical strength change rate and dielectric property change rate of the structure material; index characteristics corresponding to each of the compatibility evaluation indexes are calculated; wherein the index characteristics comprise trend intensity, fluctuation characteristics and mutation characteristics; according to the index characteristics, weight coefficients corresponding to each of the compatibility evaluation indexes are calculated, and a transformer structure material and insulating liquid compatibility comprehensive score is calculated according to index values of each of the compatibility evaluation indexes and the corresponding weight coefficients, and then a transformer structure material and insulating liquid compatibility evaluation result is obtained according to the compatibility comprehensive score. The application can provide a theoretical basis for transformer structure material and insulating liquid compatibility evaluation, and the compatibility of the transformer structure material and the insulating liquid is evaluated through the compatibility evaluation index of the transformer structure material and the insulating liquid before the transformer is put into use, so that the insulation performance of the electrical insulation system is improved, and early damage or shortened service life of the equipment caused by use of incompatible materials is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a flowchart of a transformer structure material and insulating liquid compatibility evaluation method provided by an embodiment of the application;

[0052] Figure 2 is a structural schematic diagram of a transformer structure material and insulating liquid compatibility evaluation device provided by an embodiment of the application. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0056] In this paper, the term "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0058] In the description of the embodiments of the present application, the terms "a plurality of", "several" refer to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] Embodiment one

[0061] Please refer to Figure 1 To solve the problem that the compatibility of transformer structure material and insulating liquid cannot be evaluated in the prior art, an embodiment of the present application provides a flowchart of a method for evaluating the compatibility of transformer structure material and insulating liquid, which comprises the following specific steps:

[0062] S1, obtaining a compatibility evaluation index of a transformer structural material and an insulating liquid; wherein the compatibility evaluation index comprises: an insulating liquid performance index and a structural material performance index obtained in a compatibility experiment of the transformer structural material and the insulating liquid; the insulating liquid performance index comprises: moisture, acid value, breakdown voltage, interfacial tension and dielectric loss factor of the insulating liquid; and the structural material performance index comprises: mass volume change rate, mechanical strength change rate and dielectric property change rate of the structural material;

[0063] Specifically, first, a compatibility experiment of a transformer structural material and an insulating liquid is carried out: the solid material and the insulating liquid need to be pretreated, and then the solid material and the insulating liquid are placed in an aging tank at a ratio of four times the ratio used in an actual transformer, dry nitrogen is blown into the insulating liquid for continuous purging, then the experimental container is closed and sealed, and the experimental container is placed in an oven, the experimental temperature is set to the heat resistance level corresponding to the different insulating liquids, and the experimental time is set to 168 hours as a period, and at least four periods of experiments are carried out. After the oven is heated, the experimental container is taken out of the oven, cooled to room temperature, the structural material is taken out of the insulating liquid with clean and dry tweezers, and the structural material and the insulating liquid are tested and analyzed to obtain the insulating liquid performance index and the structural material performance index. The insulating liquid performance index includes: moisture, acid value, breakdown voltage, interfacial tension and dielectric loss factor of the insulating liquid; and the structural material performance index includes: mass volume change rate, mechanical strength change rate, dielectric property change rate of the structural material, and the like, and the compatibility evaluation index is obtained to form an original data matrix. Assuming that the number of material combinations is n, the sampling time points are t1, t2, …, t T , the number of indexes is m, and a three-dimensional initial data matrix X is constructed, wherein x ijt represents the jth index value of the ith sample at time t.

[0064] S2, calculating an index feature corresponding to each of the compatibility evaluation indexes; wherein the index feature comprises: trend intensity, fluctuation characteristic and mutation feature;

[0065] Preferably, before calculating the index feature corresponding to each of the compatibility evaluation indexes, it further comprises: performing standardization processing on the breakdown voltage and the interfacial tension according to a preset first standardization formula, and performing standardization processing on the moisture, the acid value, the dielectric loss factor, the mass volume change rate, the mechanical property change rate and the dielectric property change rate according to a preset second standardization formula;

[0066] The first standardization formula is:

[0067]

[0068] The second standardization formula is:

[0069]

[0070] wherein y ijt is the jth normalized compatibility evaluation index value of the ith sample at time t, x ijt is the jth compatibility evaluation index value of the ith sample at time t, x j is the jth compatibility evaluation index value of all samples in all periods.

[0071] Preferably, the trend intensity is calculated by the following formula:

[0072]

[0073] The fluctuation characteristic is calculated by the following formula, wherein represents the mean value of y ijt :

[0074]

[0075] The mutation feature A ij is calculated by the following formula:

[0076]

[0077] wherein τ ij is the trend intensity, CV ij is the fluctuation characteristic, A ij is the normalized mutation feature, is the mean value at the sampling time point t, is the mean value of y ijt , a ij is the initial mutation feature value without normalization, Δt is the length of a single aging experiment period, T is the total number of periods, a j is the jth column data of a ij , y i,j,t+1 is the jth normalized compatibility evaluation index value of the ith sample at time t+1, y i,j,t is the jth normalized compatibility evaluation index value of the ith sample at time t, y i,j,t-1 is the jth normalized compatibility evaluation index value of the ith sample at time t-1.

[0078] Specifically, after obtaining the compatibility evaluation indexes of the transformer structural material and the insulating liquid, the compatibility evaluation indexes need to be standardized to obtain a standardized data matrix Y. The compatibility evaluation indexes are divided into positive indexes and reverse indexes. For the positive indexes (breakdown voltage of the insulating liquid, interfacial tension), the first standardization formula is used for standardization processing; for the reverse indexes (moisture of the insulating liquid, acid value, dielectric loss factor, and mass-volume change rate, mechanical property change rate, dielectric property change rate of the structural material), the second standardization formula is used for standardization processing.

[0079] Then, the index characteristics corresponding to each of the compatibility evaluation indexes (including trend intensity, fluctuation characteristics, and mutation characteristics) are calculated, that is, three core indexes of trend intensity, fluctuation characteristics, and mutation characteristics are extracted from the time series to quantify the evolution rate, stability change, and sudden deterioration signal of the material performance, and a dynamic feature vector is formed. First, the trend intensity τ ij is calculated, then the fluctuation characteristics CV ij are calculated, and finally the mutation characteristics A ij are calculated, and the calculation formula is as shown in the above formula.

[0080] S3, according to the index characteristics, the weight coefficients corresponding to each of the compatibility evaluation indexes are calculated, and according to the index values of each of the compatibility evaluation indexes and the corresponding weight coefficients, the compatibility comprehensive score of the transformer structural material and the insulating liquid is calculated, and then according to the compatibility comprehensive score, the compatibility evaluation result of the transformer structural material and the insulating liquid is obtained.

[0081] Preferably, according to the index characteristics, the weight coefficients corresponding to each of the compatibility evaluation indexes are calculated, including: according to the characteristic indexes, the probability distribution of each of the compatibility indexes is calculated; according to the probability distribution, the information entropy of each of the compatibility indexes is calculated; according to the information entropy, the basic weight of each of the compatibility indexes is calculated, and the basic weight is modified according to the trend intensity; the modified basic weight is adjusted and normalized according to the fluctuation characteristics and the mutation characteristics, to obtain the weight coefficients corresponding to each of the compatibility indexes.

[0082] Preferably, the compatibility comprehensive score of the transformer structural material and the insulating liquid is calculated by the following formula:

[0083]

[0084] wherein, S i is the compatibility comprehensive score of the transformer structural material and the insulating liquid, R ijt is the rank obtained by sorting the samples y ijt from small to large, is the index weight of the compatibility evaluation index k, and m is the number of the compatibility evaluation indexes. Dynamic RSR score of the ith sample, RSR (dynamic) Data set containing dynamic RSR scores of all samples.

[0085] Specifically, after calculating the index characteristics corresponding to each of the compatibility evaluation indexes, dynamic weight distribution is performed on each of the compatibility evaluation indexes according to the index characteristics, an objective weight of an entropy weight method and a trend sensitivity factor are fused, a fluctuation penalty term is introduced to correct the weight distribution, data statistical rules and evolution key characteristics are balanced through parameter optimization, and a weight coefficient corresponding to each of the compatibility evaluation indexes is generated. The specific steps are as follows:

[0086] 1. Based on the information entropy theory, the standardized values y ijt of each of the compatibility evaluation indexes are converted into a probability form to reflect the relative proportion of the index value in the whole data, and to provide a probability basis for information entropy calculation. ijt

[0087]

[0088] 2. Information entropy measures the dispersion degree of the index: the greater the entropy value, the more dispersed the data distribution (high uncertainty), and the more information the index carries. The information entropy E k of each of the compatibility evaluation indexes is calculated to measure the dispersion degree of each of the compatibility evaluation indexes.

[0089]

[0090] 3. Based on the core idea of the entropy weight method: the smaller the information entropy E k , the greater the weight (because of the low-entropy index data, a higher weight is needed to highlight its stability). The basic weight of the entropy weight method is calculated. An objective weight is generated to avoid subjective bias.

[0091]

[0092] 4. Trend intensity (performance evolution slope) τ ij is introduced to dynamically amplify the basic weight: the more significant the trend, the higher the weight. Trend-sensitive correction calculation is then performed to capture key signals of performance evolution, and the corrected basic weight is obtained. The adjustment coefficient α can be 0.2-0.5:

[0093]

[0094] 5. Finally, the final weight coefficient is obtained through fluctuation penalty and mutation enhancement calculation. ​The weight of the high fluctuation index is reduced, the weight of the sudden deterioration signal is increased, normalization ensures that all weight sums are 1, wherein the fluctuation penalty coefficient β can be taken as 1.0-2.0, the interference of the index with too large fluctuation is reduced, and the weight of the sudden deterioration signal is amplified:

[0095]

[0096] After the weight coefficients corresponding to each compatibility evaluation index are calculated, the compatibility comprehensive score of the transformer structure material and the insulating liquid can be calculated according to the index value and the corresponding weight coefficient of each compatibility evaluation index. The static performance and dynamic trend are integrated, and the compatibility comprehensive score S is output i , finally, each evaluation grade is scored, first, for each time point t and index j, the sample y ijt is sorted from small to large to generate the rank R ijt .

[0097] The TS-RSR comprehensive value is obtained as

[0098]

[0099] Finally, the normalized compatibility comprehensive score Si is:

[0100]

[0101] The final compatibility comprehensive score Si is located in the interval [0, 1], and the closer to 1, the better the compatibility between the i-th insulating liquid and the solid material combination.

[0102] As can be seen, the present application provides a compatibility evaluation method of transformer structure material and insulating liquid, the present application adopts the improved TS-RSR method to introduce time attenuation weight aggregation data, dynamic trend feature extraction (such as slope and acceleration calculation) and multi-stage grey correlation coupling analysis, break through the traditional limitation, realize long-term performance evolution evaluation and early risk warning, have the systematic advantage of fuzzy comprehensive evaluation method, and at the same time, the engineering interpretability is strengthened. All-round consideration of various performance indexes of transformer structure material and insulating liquid, comprehensive analysis of the compatibility degree between transformer insulating liquid and structure material according to the change of the physicochemical performance indexes of the transformer insulating liquid and structure material after multi-period compatibility experiment, a comprehensive and comprehensive compatibility evaluation method of transformer structure material and insulating liquid is proposed, which provides a theoretical basis for the evaluation method of transformer structure material and insulating liquid.

[0103] Example two

[0104] Please refer to Figure 2A structural diagram of a compatibility evaluation device for a transformer structural material and an insulating liquid according to an embodiment of the present application, the device comprising: an evaluation index acquisition module, an index feature calculation module, and a compatibility evaluation module;

[0105] The evaluation index acquisition module is configured to acquire a compatibility evaluation index of the transformer structural material and the insulating liquid, wherein the compatibility evaluation index comprises an insulating liquid performance index and a structural material performance index obtained in a compatibility experiment of the transformer structural material and the insulating liquid, the insulating liquid performance index comprises moisture, acid value, breakdown voltage, interfacial tension, and dielectric loss factor of the insulating liquid, and the structural material performance index comprises mass-volume change rate, mechanical strength change rate, and dielectric property change rate of the structural material.

[0106] The index feature calculation module is configured to calculate an index feature corresponding to each of the compatibility evaluation indexes, wherein the index feature comprises trend intensity, fluctuation characteristics, and mutation characteristics.

[0107] The compatibility evaluation module is configured to calculate a weight coefficient corresponding to each of the compatibility evaluation indexes according to the index features, and calculate a compatibility comprehensive score of the transformer structural material and the insulating liquid according to an index value of each of the compatibility evaluation indexes and the corresponding weight coefficient, and then obtain a compatibility evaluation result of the transformer structural material and the insulating liquid according to the compatibility comprehensive score.

[0108] Preferably, before calculating the index feature corresponding to each of the compatibility evaluation indexes, the method further comprises:

[0109] standardizing the breakdown voltage and the interfacial tension according to a preset first standardization formula, and standardizing the moisture, the acid value, the dielectric loss factor, the mass-volume change rate, the mechanical property change rate, and the dielectric property change rate according to a preset second standardization formula.

[0110] The first standardization formula is:

[0111]

[0112] The second standardization formula is:

[0113]

[0114] wherein y ijt is a jth standardized compatibility evaluation index value of an ith sample at time t, x ijt is a jth compatibility evaluation index value of the ith sample at time t, x j is a jth compatibility evaluation index value of all samples in all periods.

[0115] Preferably, the weight coefficient corresponding to each compatibility evaluation index is calculated according to the index characteristics, comprising:

[0116] According to the index characteristics, a probability distribution of each compatibility index is calculated;

[0117] According to the probability distribution, an information entropy of each compatibility index is calculated;

[0118] According to the information entropy, a basic weight of each compatibility index is calculated, and the basic weight is modified according to the trend intensity;

[0119] According to the fluctuation characteristics and mutation characteristics, the modified basic weight is adjusted and normalized to obtain the weight coefficient corresponding to each compatibility index.

[0120] It should be noted that the above-described device embodiments are only illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. In addition, the connection relationship between the modules in the device embodiment provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0121] As can be clearly understood by those skilled in the art, for the convenience and brevity of the above-described device, the specific working process can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0122] Embodiment three

[0123] Correspondingly, the embodiment of the present application provides an electronic device, the device includes a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, when the processor executes the computer program, the transformer structure material and the insulation liquid compatibility evaluation method described in the above embodiment of the application is realized.

[0124] The electronic device can be a desktop computer, a notebook computer, a palm computer and a cloud server, etc. The device can include but is not limited to a processor, a memory.

[0125] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, or the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor or the like, and is a control center of the device, which connects all parts of the device through various interfaces and lines.

[0126] Embodiment four

[0127] Correspondingly, an embodiment of the present application provides a storage medium including a stored computer program, wherein the computer program controls a device where the storage medium is located to perform the compatibility evaluation method of the transformer structure material and the insulating liquid as described in the above-mentioned embodiments of the present application when the computer program is running.

[0128] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function, and the like; and the data storage area can store data created according to the use of the mobile phone and the like. In addition, the memory can include a high-speed random access memory, and can also include a nonvolatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory device.

[0129] The storage medium is a computer readable storage medium, and the computer program is stored in the computer readable storage medium. When the computer program is executed by a processor, steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

[0130] The above is the preferred embodiment of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. A method for evaluating the compatibility of transformer structural materials and insulating fluid, characterized in that, include: The compatibility evaluation indicators for transformer structural materials and insulating fluid are obtained. These compatibility evaluation indicators include: performance indicators of the insulating fluid and structural materials obtained from compatibility tests. The performance indicators of the insulating fluid include: moisture content, acid value, breakdown voltage, interfacial tension, and dielectric loss factor. The performance indicators of the structural materials include: the rate of change of mass and volume, the rate of change of mechanical strength, and the rate of change of dielectric properties of the structural materials. Calculate the index characteristics corresponding to each of the compatibility evaluation indicators; wherein, the index characteristics include: trend strength, fluctuation characteristics, and mutation characteristics; Based on the characteristics of the indicators, the weight coefficients corresponding to each compatibility assessment indicator are calculated. Based on the indicator values ​​and corresponding weight coefficients of each compatibility assessment indicator, the comprehensive compatibility score of the transformer structural material and the insulating fluid is calculated. Then, based on the comprehensive compatibility score, the compatibility assessment result of the transformer structural material and the insulating fluid is obtained.

2. The method for evaluating the compatibility of transformer structural materials and insulating fluid as described in claim 1, characterized in that, Before calculating the index characteristics corresponding to each of the aforementioned compatibility assessment indices, the following steps are also included: According to the preset first standardization formula, the breakdown voltage and interfacial tension are standardized, and according to the preset second standardization formula, the moisture content, acid value, dielectric loss factor, mass-volume change rate, mechanical property change rate and dielectric property change rate are standardized. The first standardized formula is: The second standardized formula is: Among them, y ijt Let x be the standardized compatibility evaluation index value of the i-th sample at time t. ijt Let x be the compatibility evaluation index value of the i-th sample at time t. j Let be the j-th compatibility evaluation index value for all samples across all periods.

3. The method for evaluating the compatibility of transformer structural materials and insulating fluid as described in claim 2, characterized in that, The step of calculating the weighting coefficients corresponding to each compatibility assessment index based on the index characteristics includes: Based on the aforementioned characteristic indicators, calculate the probability distribution of each compatibility indicator; Based on the probability distribution, calculate the information entropy of each compatibility index; Based on the information entropy, calculate the basic weights of each compatibility index, and adjust the basic weights according to the trend strength; Based on the fluctuation characteristics and mutation features, the corrected basic weights are adjusted and normalized to obtain the weight coefficients corresponding to each compatibility index.

4. The method for evaluating the compatibility of transformer structural materials and insulating fluid as described in claim 3, characterized in that, The strength of the trend is calculated using the following formula: The fluctuation characteristics are calculated using the following formula, where Indicates y ijt Mean: The mutation feature A is calculated using the following formula. ij : Where, τ ij For trend strength, CV ij As a wave-like property, A ij These are the normalized mutation characteristics. The mean value at sampling time point t. For y ijt The mean, a ij The initial mutation eigenvalues ​​are unnormalized, Δt is the duration of a single aging experiment cycle, T is the total number of cycles, and a j For a ij The data in column j, y i,j,t+1 Let y be the standardized compatibility evaluation index value of the j-th sample in the i-th sample at time t+1. i,j,t Let y be the standardized compatibility evaluation index value of the j-th sample in the i-th sample at time t. i,j,t-1 Let be the standardized compatibility evaluation index value of the j-th sample in the i-th sample at time t-1.

5. The method for evaluating the compatibility of transformer structural materials and insulating fluid as described in claim 4, characterized in that, The comprehensive compatibility score between transformer structural materials and insulating fluid is calculated using the following formula: Among them, S i R is a comprehensive score for the compatibility of transformer structural materials and insulating fluid. ijt To make sample y ijt The rank obtained by sorting from smallest to largest. Let k be the weight of the compatibility evaluation index, and m be the number of compatibility evaluation indexes. Let RSR be the dynamic RSR score of the i-th sample. (dynamic) This is a dataset containing the dynamic RSR scores of all samples.

6. A compatibility assessment device for transformer structural materials and insulating fluid, characterized in that, include: The evaluation module includes an indicator acquisition module, an indicator feature calculation module, and a compatibility evaluation module. The evaluation index acquisition module is used to acquire compatibility evaluation indexes of transformer structural materials and insulating fluid; wherein, the compatibility evaluation indexes include: insulating fluid performance indexes and structural material performance indexes obtained from compatibility experiments of transformer structural materials and insulating fluid; the insulating fluid performance indexes include: moisture content, acid value, breakdown voltage, interfacial tension, and dielectric loss factor of the insulating fluid; the structural material performance indexes include: mass-volume change rate, mechanical strength change rate, and dielectric property change rate of the structural material; The indicator feature calculation module is used to calculate the indicator features corresponding to each of the compatibility evaluation indicators; wherein, the indicator features include: trend strength, fluctuation characteristics and mutation characteristics; The compatibility assessment module is used to calculate the weight coefficients corresponding to each compatibility assessment index based on the index characteristics, and to calculate the comprehensive compatibility score of the transformer structural material and the insulating fluid based on the index value and the corresponding weight coefficient of each compatibility assessment index, and then to obtain the compatibility assessment result of the transformer structural material and the insulating fluid based on the comprehensive compatibility score.

7. The compatibility evaluation device for transformer structural materials and insulating fluid as described in claim 6, characterized in that, Before calculating the index characteristics corresponding to each of the aforementioned compatibility assessment indices, the following steps are also included: According to the preset first standardization formula, the breakdown voltage and interfacial tension are standardized, and according to the preset second standardization formula, the moisture content, acid value, dielectric loss factor, mass-volume change rate, mechanical property change rate and dielectric property change rate are standardized. The first standardized formula is: The second standardized formula is: Among them, y ijt Let x be the standardized compatibility evaluation index value of the i-th sample at time t. ijt Let x be the compatibility evaluation index value of the i-th sample at time t. j Let be the j-th compatibility evaluation index value for all samples across all periods.

8. The compatibility evaluation device for transformer structural materials and insulating fluid as described in claim 7, characterized in that, The step of calculating the weighting coefficients corresponding to each compatibility assessment index based on the index characteristics includes: Based on the aforementioned characteristic indicators, calculate the probability distribution of each compatibility indicator; Based on the probability distribution, calculate the information entropy of each compatibility index; Based on the information entropy, calculate the basic weights of each compatibility index, and adjust the basic weights according to the trend strength; Based on the fluctuation characteristics and mutation features, the corrected basic weights are adjusted and normalized to obtain the weight coefficients corresponding to each compatibility index.

9. An electronic device, characterized in that, The system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the method for assessing the compatibility of transformer structural materials and insulating fluid as described in any one of claims 1 to 5.

10. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the storage medium to perform the compatibility assessment method for transformer structural materials and insulating fluid as described in any one of claims 1 to 5.

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