An insulation paper aging detection method based on decomposition products and related devices

Abstract

The present invention discloses a method and related device for detecting the aging of insulating paper based on decomposition products. The method includes: determining at least two decomposition products resulting from the aging of insulating paper located in the insulating oil of an oil-immersed transformer; constructing an objective function for each of all the decomposition products under an aging model of the same structure, where the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper; detecting the index value of each decomposition product in the insulating oil; for each decomposition product, substituting the index value into the objective function to calculate the aging time of the insulating paper as the reference aging time; and fusing the reference aging times corresponding to all the decomposition products into the target aging time of the insulating paper. The decomposition products have a strong correlation with the aging degree of the insulating paper. By fusing the aging times evaluated from at least two decomposition products to obtain the final aging time, the influence of occasionality in the evaluation can be reduced, and the accuracy of detecting the aging time of the insulating paper can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and in particular, to a method for detecting the aging of insulating paper based on decomposition products and related devices. Background Art

[0002] A transformer is a device for energy conversion and transmission in a power grid. Most transformers have been in operation for a long time, and power transmission and transformation equipment is prone to failure. If a transformer fails, it may cause a large-scale power outage, resulting in relatively large direct and indirect losses.

[0003] Oil-immersed transformers account for the majority of transformers in the power grid. During the operation of oil-immersed transformers, their insulating paper will age under the long-term action of temperature, moisture, oxygen, and electric fields. The aging process is irreversible. The impact of aging on its electrical properties (such as power frequency dielectric loss angle and breakdown voltage) is not obvious, but it will cause a sharp decline in its mechanical properties, resulting in insulation failures, and the insulating paper cannot be replaced. Therefore, the aging state and remaining life of oil-immersed transformers mainly depend on the insulation state of their solid insulation (insulating paper).

[0004] Since most direct measurement methods require the transformer to be shut down, which will cause local power outages in the power grid and easily result in unnecessary economic losses, the aging degree of the solid insulation of oil-immersed transformers mainly relies on indirect detection methods such as the content of CO (carbon monoxide) and CO 2 (carbon dioxide) dissolved in the oil. These methods have problems such as low sensitivity and being limited by the accuracy of measurement equipment, with low precision and possible misjudgment. Summary of the Invention

[0005] The present invention provides a method for detecting the aging of insulating paper based on decomposition products and related devices to solve the problem of how to improve the accuracy of detecting the aging degree of insulating paper while maintaining the operation of the transformer.

[0006] According to one aspect of the present invention, a method for detecting the aging of insulating paper based on decomposition products is provided, including:

[0007] Determining at least two decomposition products resulting from the aging decomposition of insulating paper located in the insulating oil of an oil-immersed transformer;

[0008] Constructing a target function for each of all the decomposition products under the same-structured aging model, where the target function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper;

[0009] Detecting the index value of each decomposition product in the insulating oil;

[0010] For each of the decomposition products, substitute the index value into the objective function to calculate the aging time of the insulating paper, which is used as the reference aging time;

[0011] Fuse the reference aging times corresponding to all the decomposition products into the target aging time of the insulating paper.

[0012] According to another aspect of the present invention, there is provided an insulating paper aging detection device based on decomposition products, including:

[0013] A decomposition product determination module for determining at least two decomposition products resulting from the aging of the insulating paper located in the insulating oil of an oil-immersed transformer;

[0014] An objective function construction module for constructing an objective function for each of the decomposition products under an aging model of the same structure, where the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper;

[0015] An index value detection module for detecting the index value of each of the decomposition products in the insulating oil;

[0016] A reference aging time calculation module for substituting the index value into the objective function for each of the decomposition products to calculate the aging time of the insulating paper, which is used as the reference aging time;

[0017] A target aging time fusion module for fusing the reference aging times corresponding to all the decomposition products into the target aging time of the insulating paper.

[0018] According to another aspect of the present invention, there is provided an electronic device, which includes:

[0019] At least one processor; and

[0020] A memory communicatively connected to the at least one processor; wherein,

[0021] The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor can execute the insulating paper aging detection method based on decomposition products according to any embodiment of the present invention.

[0022] According to another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program, and when the computer program is used to be executed by a processor, it realizes the insulating paper aging detection method based on decomposition products according to any embodiment of the present invention.

[0023] In this embodiment, at least two decomposition products resulting from the decomposition of insulating paper due to aging in the insulating oil of an oil-immersed transformer are determined; for all the decomposition products, objective functions are respectively constructed under an aging model of the same structure, and the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper; the index value of each decomposition product is detected in the insulating oil; for each decomposition product, the index value is substituted into the objective function to calculate the aging time of the insulating paper, which is used as the reference aging time; the reference aging times corresponding to all the decomposition products are fused into the target aging time of the insulating paper. This embodiment evaluates the aging time of the insulating paper based on the decomposition products of the insulating paper in the insulating oil, does not rely on the shutdown of the oil-immersed transformer, does not cause local power outages in the power grid, and avoids economic losses. Moreover, the decomposition products are manifestations of the aging of the insulating paper, and there is a strong correlation between the decomposition products and the aging degree of the insulating paper. By fusing the aging times evaluated from at least two decomposition products to obtain the final aging time, the influence of occasionalness in the evaluation can be reduced, and the accuracy of detecting the aging time of the insulating paper can be improved.

[0024] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a flowchart of a method for detecting the aging of insulating paper based on decomposition products according to Embodiment 1 of the present invention;

[0027] Figure 2 is a relationship diagram between furfural concentration and degree of polymerization according to Embodiment 1 of the present invention;

[0028] Figure 3 is a relationship diagram between PCR-R and degree of polymerization according to Embodiment 1 of the present invention;

[0029] Figure 4A is a change trend diagram of PCR-R under an aging time according to Embodiment 1 of the present invention;

[0030] Figure 4B is a change trend diagram of furfural content under an aging time according to Embodiment 1 of the present invention;

[0031] Figure 4CIt is a graph showing the change trend of the carbon-oxygen gas content under the aging time according to Embodiment 1 of the present invention;

[0032] Figure 5 It is a comparison graph of the goodness of fit when fitting under multiple sample quantities according to Embodiment 1 of the present invention;

[0033] Figure 6 It is a comparison graph of the mean square error when fitting under multiple sample quantities according to Embodiment 1 of the present invention;

[0034] Figure 7 It is a schematic structural diagram of an insulating paper aging detection device based on decomposition products according to Embodiment 2 of the present invention;

[0035] Figure 8 It is a schematic structural diagram of an electronic device provided by Embodiment 3 of the present invention. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] Embodiment 1

[0039] Figure 1The following is a flowchart of a method for detecting the aging of insulating paper based on decomposition products provided in Embodiment 1 of the present invention. This embodiment is applicable to the situation of fusing at least two decomposition products to evaluate the aging time of insulating paper. This method can be executed by a device for detecting the aging of insulating paper based on decomposition products, and the device for detecting the aging of insulating paper based on decomposition products can be implemented in the form of hardware and / or software, and the device for detecting the aging of insulating paper based on decomposition products can be configured in an electronic device. As Figure 1 shown, the method includes:

[0040] Step 101, determine at least two decomposition products resulting from the aging decomposition of insulating paper located in the insulating oil of an oil-immersed transformer.

[0041] In practical applications, there are various dissolved substances in the insulating oil of an oil-immersed transformer. For example, water, small hydrocarbon molecules, oxidation products, formaldehyde, sugar substances, etc. In this embodiment, at least two decomposition products resulting from the aging decomposition of insulating paper are selected from these dissolved substances to detect the aging time of the insulating paper.

[0042] Exemplarily, the decomposition products include the following two:

[0043] 1. Furfural

[0044] There is a certain amount of furan compounds in the insulating oil of a transformer with an aging fault, and these furan substances are mainly furfural. Furfural only comes from the aging of insulating paper and has nothing to do with the aging of insulating oil. At the conventional operating temperature of the transformer of 60°C to 150°C, the production of furfural through levoglucosan is not the main way of furfural formation. The hydrolysis reaction of cellulose is the main reason for furfural formation. In addition, the quantity and type of hemicellulose in the insulating paper are also important reasons affecting furfural formation, because the degradation of hemicellulose will produce more furfural, and its thermal stability is poor, and it may react first to form furfural. Thus, when the insulation of the transformer ages, the insulating oil contains a certain amount of furfural. Since the movement and diffusion of furfural in the insulating oil molecules follow Fick's law, it is approximately evenly distributed in the operating transformer oil. Therefore, by quantitatively detecting furfural, the amount of its content indirectly reflects the aging degree of the transformer insulating oil and insulating paper.

[0045] During the aging process, the furfural in the insulating oil shows an upward trend. During the initial aging period, the furfural content is small and the change is not significant. It shows a significant upward trend in the middle and late stages of aging. This is mainly because the amount of furfural produced in the initial aging period is small and adheres to the surface of the insulating paper, resulting in a small amount of furfural in the insulating oil. As the aging degree increases, the production rate of furfural accelerates and the furfural initially adsorbed on the insulating paper begins to transfer to the oil. Therefore, as the aging degree of the oil-paper insulation increases, the furfural content becomes larger and the increase of furfural in the oil is more rapid.

[0046] Generally speaking, the furfural in insulating oil continuously increases with the progress of aging time. On the one hand, cellulose deteriorates, and glucose monomers crack to generate furfural and dissolve in the oil; on the other hand, antioxidants in the insulating oil will react with the generated furfural and consume a part of the furfural; finally, temperature will also cause partial evaporation or loss of furfural. In the initial stage of aging, the degree of polymerization drops at a very fast rate, corresponding to a relatively high furfural generation rate at this time. As aging progresses further, the deterioration rate continuously decreases, and the rate of furfural generation due to cellulose breakage also slows down. When the rate of furfural generation gradually becomes less than the rate of furfural consumption, the furfural content in the oil will show a downward trend.

[0047] 2. Cellulose

[0048] The main component of insulating paper is cellulose. The cumulative number of breaks of insulating paper cellulose gradually increases during thermal aging, and more cellulose falls off into the insulating oil. The long cellulose that falls off early continues to age and break into shorter cellulose in the insulating oil. At the same time, some short cellulose of insulating paper also falls off into the insulating oil during subsequent aging; due to a certain amount of long cellulose in the insulating paper itself, some long cellulose will also continue to fall off into the insulating oil.

[0049] Generally speaking, with the increase of aging time, the fracture traces of cellulose increase, the number of long cellulose decreases, the number of short cellulose increases, and the proportion of long cellulose in the oil gradually decreases, the proportion of short cellulose gradually increases, and the number of cellulose gradually increases.

[0050] Step 102: Construct objective functions for all decomposition products under the aging model of the same structure.

[0051] In this embodiment, an aging mode with a fixed structure can be constructed to describe the aging process of decomposition products, so as to fit the objective function for the aging process of decomposition products. Among them, the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper, that is, the structures of the objective functions of different decomposition products are the same, which is convenient for comparing the evaluation of the objective function and for fusing the predicted aging times of different decomposition products.

[0052] In an embodiment of the present invention, step 102 may include the following steps:

[0053] Step 1021: Determine the kinetic model.

[0054] In this embodiment, the kinetic models of insulating oil and insulating paper aging can be selected. The kinetic model represents the relationship between the degree of polymerization of insulating paper and the aging time of insulating paper. The kinetic model includes a zero-order kinetic model, a first-order kinetic model, a kinetic model based on the cumulative loss of the degree of polymerization of insulating paper, and so on.

[0055] Exemplarily, the kinetic model of the zero order is:

[0056]

[0057] where DP is the degree of polymerization of the aged insulating paper, DP 0 is the degree of polymerization of the insulating paper before aging, k is the aging rate, and t is the aging time.

[0058] Step 1022: Fit reference functions with the same structure to all decomposition products respectively.

[0059] For each decomposition product, the reference function can be fitted through experiments or other means. The structures of the reference functions for different decomposition products are the same. Among them, the reference function represents the relationship between the index value of the decomposition product in the insulating oil and the degree of polymerization of the insulating paper.

[0060] For furfural, the reference function fitted for furfural is:

[0061] DP = k 1 + k 2 log 10 F

[0062] where DP is the degree of polymerization of the aged insulating paper, k 1 and k 2 are both fitted coefficients, and F is the content of furfural in the insulating oil.

[0063] The insulating paper is aged at 130 °C for 0, 4, 7, 10, 22, 35, 60, 90 days. At the same time, the degree of polymerization of the insulating paper and the content of furfural in the insulating oil are detected to obtain the corresponding data of the degree of polymerization and the content of furfural. The corresponding data is fitted, and the fitting relationship is as Figure 2 shown. The fitted reference function is DP = 605.20 - 278.8log 10 F, that is, k 1 is 605.20, k 2 is -278.8. In addition, the first goodness of fit (R 2 ) is 0.89, and the first root mean square error (RMSE) is 95.10.

[0064] In this reference function, the degree of polymerization is linearly related to the logarithm of the furfural concentration. When the furfural concentration is higher, the insulation degree of the insulating paper is smaller.

[0065] For cellulose, the reference function fitted for cellulose is:

[0066] DP = k 3 + k 4 log 10 R

[0067] Among them, DP is the degree of polymerization of the aged insulating paper, and k 3 and k 4 are both fitting coefficients, and R is the ratio between the blue ratio and the red ratio in the dispersion color image of cellulose in insulating oil (Primary color ratio based ratio of blue to red, hereinafter referred to as PCR-R).

[0068] The insulating paper was aged at 130 °C for 0, 4, 7, 10, 22, 35, 60, and 90 days. At the same time, the degree of polymerization of the insulating paper and the characteristic value (PCR-R) of the optical properties of fiber particles in the insulating oil were detected to obtain the corresponding data of the degree of polymerization and the characteristic value (PCR-R). The fitting relationship of this corresponding data is as Figure 3 shown. Figure 3 In each aging stage, the PCR-R of the cellulose dispersion color image was normalized using the PCR-R of the unaged fiber dispersion color image. From Figure 3 it can be seen that as the PCR-R increases, the degree of polymerization shows an upward trend. Therefore, the reference function for fitting cellulose is DP = 1185.00 + 3858.00log 10 R, that is, k 3 is 1185.00, k 4 is 3858.00, the second goodness of fit (R 2 ) is 0.95, and the second root mean square error (RMSE) is 83.51.

[0069] Step 1023: Substitute the reference functions of all decomposition products into the kinetic model to eliminate the degree of polymerization of the insulating paper, and obtain the objective function.

[0070] In this embodiment, the reference functions of each decomposition product were respectively substituted into the kinetic model to eliminate the degree of polymerization of the insulating paper, thereby obtaining the objective function.

[0071] For furfural, substitute the reference function of furfural into the zero-order kinetic model to eliminate the degree of polymerization of the aged insulating paper. Thus, the objective function constructed for furfural is:[[]]

[0072]

[0073] Among them, DP 0 is the degree of polymerization of the insulating paper when it is not aged, k is the aging rate, t is the aging time, k 1 and k 2 are both fitting coefficients, and F is the content of furfural in the insulating oil.

[0074] For cellulose, the reference function of cellulose is respectively substituted into the kinetic model of the zero order to eliminate the degree of polymerization of the aged insulating paper, so the objective function constructed for cellulose is:

[0075]

[0076] Among them, DP 0 is the degree of polymerization of the insulating paper before aging, k is the aging rate, t is the aging time, k 3 and k 4 are both fitting coefficients, and R is the ratio between the blue ratio and the red ratio in the dispersion color image of cellulose in insulating oil.

[0077] For the convenience of comparison, the following mathematical model is fitted for the carbon-oxygen gas in insulating oil:

[0078] log 10 t = k 5 + k 6 log 10 G

[0079] Among them, t is the aging time, k 5 and k 6 are both fitting coefficients, and G is the content of carbon-oxygen gas in insulating oil.

[0080] In this embodiment, the objective function of furfural, the objective function of cellulose, and the mathematical model of carbon-oxygen gas are used to fit the test data, and the fitting results are as Figure 4A - Figure 4C shown.

[0081] The parameters of the fitting results are compared and analyzed as shown in the following table:

[0082]

[0083] Based on the objective function of PCR-R of cellulose and the objective function of the content of furfural, the goodness of fit is significantly better than that of the mathematical model based on the content of carbon-oxygen gas, and its mean square error is smaller. On the one hand, this shows that the dispersion color of fiber can effectively characterize the life of insulating paper. On the other hand, it also shows that there will be a large error when using carbon-oxygen gas to characterize the life of insulating paper, mainly because the carbon-oxygen gas in insulating oil not only comes from the thermal aging decomposition of insulating paper, but also comes from the thermal aging of insulating oil and the external environment. At the same time, by comparing the goodness of fit and mean square error of the objective function of PCR-R of cellulose and the objective function of the content of furfural, it can be seen that the stabilities of the objective function of PCR-R of cellulose and the objective function of the content of furfural are not much different. However, considering the fitting situation of the two objective functions with the degree of polymerization, it can be seen that the objective function of PCR-R of cellulose has more advantages in evaluating the aging degree of insulating paper.

[0084] Step 103: Detect the index value of each decomposition product in the insulating oil.

[0085] In practical applications, according to the impurity components of the insulating oil of the operating transformer and the characteristics such as the size and shape of the suspended fiber particles in the insulating oil, the transformer can be connected to the filtering device through the oil inlet valve at the transformer site. The transformer oil passes through the oil inlet valve and enters the liquid seal box through the oil inlet pipe. The transformer oil first fills the liquid seal box and then is injected into the oil inlet tank. The transformer oil enters the filtering system through the conduit. Two different filter meshes are installed in the filtering system from top to bottom, namely the filter membrane and the steel core filter layer. The filter membrane can filter the transformer oil, and the steel core filter layer plays a supporting role. The concave interface and the convex interface are mechanically engaged, and the sleeve nut and the sleeve screw are fixed by threads to ensure the tightness of the filtering system. The filtered transformer oil enters the waste oil tank through the drain pipe. A drain valve is installed at the bottom of the waste oil tank. The vacuum pump is connected to the waste oil tank to reduce the pressure in the waste oil tank. When conducting an experiment on separating fiber particles in the transformer oil on site, connect the on-site transformer to the oil inlet valve and turn on the vacuum pump. After waiting for the vacuum pump to work for 5 minutes, open the oil sampling valve of the transformer. When the oil volume in the oil inlet tank reaches 3 / 4 of the total volume, close the oil sampling valve of the transformer. Under the action of gravity and pressure difference, the insulating oil in the oil inlet tank flows through the filter membrane and the steel core filter layer to the waste oil tank. When conducting multiple filtering operations, the liquid seal box is filled with transformer oil, which can ensure that when the liquid level in the oil inlet tank drops below the bottom end of the conduit, the transformer and the filtering device are isolated, preventing air and moisture from entering the transformer.

[0086] In the substation to be tested, extract a certain volume (such as 3000 mL) of insulating oil, and detect the index value of each decomposition product in the insulating oil respectively. This index value is used to substitute into the objective function to evaluate the aging time of the insulating paper.

[0087] In specific implementation, for furfural, the content of furfural can be detected in the insulating oil as the index value.

[0088] For cellulose, the dispersion color image of cellulose with a quantity greater than or equal to 110 can be detected in the insulating oil, and the ratio between the blue ratio and the red ratio is calculated respectively in each frame of the dispersion color image as the index value.

[0089] Furthermore, since there are significant differences in the fiber dispersion color maps of insulating oils with different aging times, the dispersion color map of a single fiber provides local information on the aging of the insulating paper. The quantity of the dispersion color maps is closely related to the accuracy of the objective function. The larger the quantity, the richer the information on the aging of the insulating paper obtained, and the more representative of the overall characteristics of cellulose, thus enabling a more effective evaluation of the aging degree and aging time of the insulating paper.

[0090] Obtaining a certain number of dispersion color maps of cellulose for statistical analysis can improve the accuracy of evaluating the aging degree and aging time of insulating paper. However, it takes a relatively long time to collect hundreds or thousands of dispersion color maps of cellulose in transformer insulating oil, which incurs a high cost. Therefore, in this embodiment, the influence law of the number of dispersion color maps of cellulose on the extraction of aging characteristic quantities is explored to determine a reasonable number.

[0091] In this embodiment, the influence of the number of dispersion color maps of cellulose on the aging characteristic quantities representing the aging degree and aging time of insulating paper is evaluated mainly from two parameters, namely, goodness of fit and mean square error, and their standard deviations, in order to give the minimum acceptable number under laboratory conditions.

[0092] Set the number of dispersion color maps of cellulose to 70, 80, 90, 100, and 110. For each number, randomly select fiber dispersion image samples of this number from 115 dispersion color maps of cellulose at each aging time, calculate PCR-R, and respectively fit the experimental data using the objective function. Repeat the above process 10 times to obtain the mean values and standard deviations of the goodness of fit and mean square error of 10 times of modeling, and study their variation laws with the sample number.

[0093] As Figure 5 shown, with the decrease in the number, the average value of the goodness of fit generally shows a decreasing trend, while the standard deviation of the goodness of fit increases with the decrease in the sample number, indicating an increase in the instability of the objective function and a decrease in accuracy. The growth rate of the standard deviation is particularly obvious when the number is 70, 80, and 90. The above situation is mainly due to the fact that when the number is small, the relatively limited samples cannot fully reflect the overall aging characteristics of cellulose, and thus lack a good correlation law with the degree of polymerization and aging time of insulating paper. For the case where the number is 100, although the average value of its goodness of fit is already close to the average value of the goodness of fit when the number is 110, the stability and accuracy of the objective function are affected by the randomly selected samples to a certain extent.

[0094] As Figure 6 can be seen from the degree of polymerization (DP) and PCR-R in Figure 6 , the average value of the mean square error of the objective function increases with the decrease in the sample number, and the average value of the mean square error does not decrease significantly when the sample number is 100 or more. The difference between 110 samples and 100 samples is not large. As

[0095] can be seen from the aging time and PCR-R in Figure 6 , although the mean square error increases with the decrease in the sample number, when the sample number is greater than or equal to 90, the standard deviation of the mean square error does not change significantly.

[0095] Therefore, under this test condition, the sample number should be greater than or equal to 110 to obtain a more accurate aging evaluation result and minimize the observation workload of fiber dispersion color maps to the greatest extent.

[0096] Step 104: For each decomposition product, substitute the index value into the objective function to calculate the aging time of the insulating paper, which is used as the reference aging time.

[0097] For each decomposition product, its index value can be substituted into the objective function for calculation, so as to calculate the aging time of the insulating paper, which is denoted as the reference aging time.

[0098] For furfural, substitute the index value into the following formula to calculate the aging time of the insulating paper, which is used as the reference aging time:

[0099]

[0100] For cellulose, substitute each ratio into the following formula to calculate the aging time of the insulating paper, which is used as the reference aging time:

[0101]

[0102] Since the sample size of cellulose is large, the average value of all reference aging times of cellulose can be calculated as the new reference aging time.

[0103] Step 105: Integrate the reference aging times corresponding to all decomposition products into the target aging time of the insulating paper.

[0104] In practical applications, since the objective function is fitted in the same aging model, the reference aging times evaluated for different decomposition products can be evaluated in the same dimension, so as to integrate the reference aging times corresponding to all decomposition products into the target aging time of the insulating paper in a linear or non-linear manner.

[0105] In an embodiment of the present invention, Step 105 may include the following steps:

[0106] Step 1051: Assign a first weight to furfural and a second weight to cellulose.

[0107] Step 1052: Calculate the product of the reference aging time corresponding to furfural and the first weight as the first weighted time.

[0108] Step 1053: Calculate the product of the reference aging time corresponding to cellulose and the second weight as the second weighted time.

[0109] Step 1054: Calculate the sum of the first weighted time and the second weighted time as the target aging time of the insulating paper.

[0110] In this embodiment, the reference aging time evaluated based on furfural and the reference aging time evaluated based on cellulose are integrated into the target aging time of the insulating paper in a linear manner.

[0111] In a specific implementation, a first weight can be assigned to furfural and a second weight to cellulose respectively. Considering that the objective function based on cellulose in PCR-R has more advantages in evaluating the aging degree of insulating paper, the first weight can be set to be less than the second weight.

[0112] On the one hand, multiply the reference aging time corresponding to furfural by the first weight to obtain the first weighted time. On the other hand, multiply the reference aging time corresponding to cellulose by the second weight to obtain the second weighted time. Add the first weighted time and the second weighted time to obtain the target aging time of the insulating paper.

[0113] Then, the target aging time of the insulating paper can be expressed as:

[0114] T = αt 1 + βt 2

[0115] where T is the target aging time of the insulating paper, t 1 is the reference aging time corresponding to furfural, t 2 is the reference aging time corresponding to cellulose, α is the first weight, and β is the second weight.

[0116] In one case, both the first weight and the second weight are default empirical values, which can reduce the computational amount and improve the computational speed while ensuring a certain accuracy.

[0117] In another case, the first weight and the second weight can be dynamically set according to the fitting situation of the objective function to ensure the adaptability between the first weight and the second weight, thereby improving the accuracy of evaluating the aging degree of the insulating paper.

[0118] On the one hand, query the reference function fitted during the process of constructing the target parameters for furfural, and query the first fitting index of the reference function fitted for furfural.

[0119] Among them, the reference function represents the relationship between the content of furfural in insulating oil and the degree of polymerization of insulating paper. The objective function substitutes the reference function of furfural into the kinetic model to eliminate the degree of polymerization of insulating paper, and the kinetic model represents the relationship between the degree of polymerization of insulating paper and the aging time of insulating paper.

[0120] On the other hand, query the reference function fitted during the process of constructing the target parameters for cellulose, and query the second fitting index of the reference function fitted for cellulose.

[0121] Among them, the reference function represents the relationship between the ratio of the blue proportion to the red proportion in the dispersion color image of cellulose in insulating oil and the degree of polymerization of insulating paper. The target function is obtained by substituting the reference function of cellulose into the kinetic model to eliminate the degree of polymerization of insulating paper. The kinetic model represents the relationship between the degree of polymerization of insulating paper and the aging time of insulating paper.

[0122] The first fitting index and the second fitting index respectively characterize the performance of the reference function of furfural and the reference function of cellulose. Therefore, the first weight can be configured for furfural and the second weight can be configured for cellulose based on the first fitting index and the second fitting index respectively.

[0123] Exemplarily, the first fitting index includes the first goodness of fit and the first mean square error, and the second fitting index includes the second goodness of fit and the second mean square error.

[0124] In this example, the first goodness of fit and the first mean square error are substituted into the following formula to calculate the first fitting score:

[0125]

[0126] Where is the first goodness of fit, and RMSE 1 is the first mean square error;

[0127] The second goodness of fit and the second mean square error are substituted into the following formula to calculate the second fitting score:

[0128]

[0129] Where is the second goodness of fit, and RMSE 2 is the second mean square error;

[0130] Calculate the ratio between the first fitting score and the second fitting score, and thus configure the first weight for furfural and the second weight for cellulose with reference to the ratio between the first fitting score and the second fitting score, such that the first weight is less than the second weight.

[0131] In this embodiment, at least two decomposition products resulting from the aging-induced decomposition of insulating paper located in the insulating oil of an oil-immersed transformer are determined; for all the decomposition products, objective functions are respectively constructed under an aging model with the same structure, where the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper; the index values of each decomposition product are detected in the insulating oil; for each decomposition product, the index value is substituted into the objective function to calculate the aging time of the insulating paper as the reference aging time; the reference aging times corresponding to all the decomposition products are fused into the target aging time of the insulating paper. This embodiment evaluates the aging time of the insulating paper based on the decomposition products of the insulating paper in the insulating oil, does not rely on the shutdown of the oil-immersed transformer, does not cause local power outages in the power grid, and avoids economic losses. Moreover, the decomposition products are manifestations of the aging of the insulating paper, and there is a strong correlation between the decomposition products and the aging degree of the insulating paper. By fusing the aging times evaluated from at least two decomposition products to obtain the final aging time, the influence of occasionalness in the evaluation can be reduced, and the accuracy of detecting the aging time of the insulating paper can be improved.

[0132] Embodiment III

[0133] Figure 7 FIG. is a schematic structural diagram of a device for detecting the aging of insulating paper based on decomposition products provided in Embodiment II of the present invention. As Figure 7 shown, the device includes:

[0134] A decomposition product determination module 701, configured to determine at least two decomposition products resulting from the aging-induced decomposition of insulating paper located in the insulating oil of an oil-immersed transformer;

[0135] An objective function construction module 702, configured to respectively construct objective functions for all the decomposition products under an aging model with the same structure, where the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper;

[0136] An index value detection module 703, configured to detect the index values of each decomposition product in the insulating oil;

[0137] A reference aging time calculation module 704, configured to, for each decomposition product, substitute the index value into the objective function to calculate the aging time of the insulating paper as the reference aging time;

[0138] A target aging time fusion module 705, configured to fuse the reference aging times corresponding to all the decomposition products into the target aging time of the insulating paper.

[0139] In an embodiment of the present invention, the objective function construction module 702 is further configured to:

[0140] Determine a kinetic model, which represents the relationship between the degree of polymerization of the insulating paper and the aging time of the insulating paper;

[0141] Fit reference functions with the same structure to all the decomposition products, where the reference function represents the relationship between the index value of the decomposition product in the insulating oil and the degree of polymerization of the insulating paper;

[0142] Substitute the reference functions of all the decomposition products into the kinetic model to eliminate the degree of polymerization of the insulating paper, and obtain an objective function.

[0143] In an embodiment of the present invention, the decomposition products include furfural and cellulose;

[0144] The kinetic model is:

[0145]

[0146] The reference function fitted to the furfural is:

[0147] DP = k 1 + k 2 log 10 F

[0148] The reference function fitted to the cellulose is:

[0149] DP = k 3 + k 4 log 10 R

[0150] The objective function constructed for the furfural is:

[0151]

[0152] The objective function constructed for the cellulose is:

[0153]

[0154] Wherein, DP is the degree of polymerization of the aged insulating paper, DP 0 is the degree of polymerization of the insulating paper before aging, k is the aging rate, t is the aging time, k 1 , k 2 , k 3 and k 4 are all fitted coefficients, F is the content of furfural in the insulating oil, and R is the ratio between the blue ratio and the red ratio in the dispersion color image presented by the cellulose in the insulating oil.

[0155] In an embodiment of the present invention, the decomposition products include furfural and cellulose;

[0156] The index value detection module 703 is further configured to:

[0157] Detect the content of furfural in the insulating oil;

[0158] Detect the dispersion color image of the cellulose with a quantity greater than or equal to 110 in the insulating oil;

[0159] Calculate the ratio between the blue ratio and the red ratio in each frame of the dispersion color image;

[0160] The reference aging time calculation module 704 is further configured to:

[0161] For the furfural, substitute the index value into the following formula to calculate the aging time of the insulating paper as the reference aging time:

[0162]

[0163] For the cellulose, substitute each ratio into the following formula to calculate the aging time of the insulating paper as the reference aging time:

[0164]

[0165] Calculate the average value of all the reference aging times of the cellulose as the new reference aging time;

[0166] wherein, DP is the degree of polymerization of the aged insulating paper, DP 0 is the degree of polymerization of the insulating paper when not aged, k is the aging rate, t is the aging time, k 1 、k 2 、k 3 and k 4 are all fitted coefficients, F is the content of furfural in the insulating oil, and R is the ratio between the blue ratio and the red ratio in the dispersion color image presented by the cellulose in the insulating oil.

[0167] In an embodiment of the present invention, the decomposition products include furfural and cellulose;

[0168] The target aging time fusion module 705 is further configured to:

[0169] Configure a first weight for the furfural and a second weight for the cellulose, and the first weight is less than the second weight;

[0170] Calculate the product of the reference aging time corresponding to the furfural and the first weight as the first weighted time;

[0171] Calculate the product of the reference aging time corresponding to the cellulose and the second weight as the second weighted time;

[0172] Calculate the sum of the first weighted time and the second weighted time as the target aging time of the insulating paper.

[0173] In an embodiment of the present invention, the target aging time fusion module 705 is further configured to:

[0174] Query the reference function fitted during the process of constructing the target parameters for the furfural. The reference function represents the relationship between the content of the furfural in the insulating oil and the degree of polymerization of the insulating paper. The target function is obtained by substituting the reference function of the furfural into the kinetic model to eliminate the degree of polymerization of the insulating paper. The kinetic model represents the relationship between the degree of polymerization of the insulating paper and the aging time of the insulating paper;

[0175] Query the first fitting index for fitting the reference function for the furfural;

[0176] Query the reference function fitted during the process of constructing the target parameters for the cellulose. The reference function represents the relationship between the ratio of the blue ratio to the red ratio in the dispersion color image presented by the cellulose in the insulating oil and the degree of polymerization of the insulating paper. The target function is obtained by substituting the reference function of the cellulose into the kinetic model to eliminate the degree of polymerization of the insulating paper. The kinetic model represents the relationship between the degree of polymerization of the insulating paper and the aging time of the insulating paper;

[0177] Query the second fitting index for fitting the reference function for the cellulose;

[0178] Configure a first weight for the furfural and a second weight for the cellulose based on the first fitting index and the second fitting index respectively.

[0179] In an embodiment of the present invention, the first fitting index includes the first goodness of fit and the first mean square error, and the second fitting index includes the second goodness of fit and the second mean square error;

[0180] The target aging time fusion module 705 is further configured to:

[0181] Substitute the first goodness of fit and the first mean square error into the following formula to calculate the first fitting score:

[0182]

[0183] Wherein, is the first goodness of fit, and RMSE 1 is the first mean square error;

[0184] Substitute the second goodness of fit and the second mean square error into the following formula to calculate the second fitting score:

[0185]

[0186] where is the second goodness of fit, and RMSE 2 is the second mean square error;

[0187] With reference to the ratio between the first fitting score and the second fitting score, configure a first weight for furfural and a second weight for cellulose.

[0188] The insulating paper aging detection device based on decomposition products provided by the embodiments of the present invention can execute the insulating paper aging detection method based on decomposition products provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the insulating paper aging detection method based on decomposition products.

[0189] Embodiment III

[0190] Figure 8 FIG. shows a schematic structural diagram of an electronic device 10 that can be used to implement the embodiments of the present invention. The electronic device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0191] As Figure 8 shown, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by at least one processor. The processor 11 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0192] Multiple components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0193] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the insulation paper aging detection method based on decomposition products.

[0194] In some embodiments, the insulation paper aging detection method based on decomposition products can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the insulation paper aging detection method based on decomposition products described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the insulation paper aging detection method based on decomposition products in any other suitable manner (e.g., by means of firmware).

[0195] The various embodiments of the systems and technologies described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on a chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special or general programmable processor, and can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0196] A computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer programs can be executed entirely on the machine, partially on the machine, as a stand-alone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0197] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0198] In order to provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0199] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected with each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0200] A computing system can include a client and a server. The client and the server are generally far from each other and typically interact through a communication network. The client-server relationship is created by computer programs that run on respective computers and have a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0201] Example 4

[0202] The embodiment of the present invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the insulation paper aging detection method based on decomposition products provided in any embodiment of the present invention.

[0203] In the process of implementing the computer program product, computer program code for performing the operations of the present invention can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a local area network (LAN) or a wide area network (WAN) - or can be connected to an external computer (e.g., by connecting through an Internet service provider via the Internet).

[0204] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0205] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An insulation paper aging detection method based on decomposition products, characterized in that, it includes: Determine at least two decomposition products resulting from the aging of the insulation paper located in the insulating oil of an oil-immersed transformer; Construct objective functions for all the decomposition products respectively under an aging model of the same structure, where the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulation paper; Detect the index values of each decomposition product in the insulating oil; For each decomposition product, substitute the index value into the objective function to calculate the aging time of the insulation paper as the reference aging time; Fuse the reference aging times corresponding to all the decomposition products into the target aging time of the insulation paper; Wherein, the decomposition products include furfural and cellulose, and the fusing of the reference aging times corresponding to all the decomposition products into the target aging time of the insulation paper includes: Query the reference function fitted during the process of constructing the target parameters for furfural. The reference function for fitting furfural represents the relationship between the content of furfural in the insulating oil and the degree of polymerization of the insulation paper; Query the first fitting index of the reference function fitted for furfural. The first fitting index includes the first goodness of fit and the first mean square error, and the first fitting index characterizes the performance of the reference function for fitting furfural; Query the reference function fitted during the process of constructing the target parameters for cellulose. The reference function for fitting cellulose represents the relationship between the ratio of the blue proportion to the red proportion in the dispersion color image presented by the cellulose in the insulating oil and the degree of polymerization of the insulation paper; Query the second fitting index of the reference function fitted for cellulose. The second fitting index characterizes the performance of the reference function for fitting cellulose, and the second fitting index includes the second goodness of fit and the second mean square error; Substitute the first goodness of fit and the first mean square error into the following formula to calculate the first fitting score: ； Among them, is the first goodness of fit, is the first mean square error; Substitute the second goodness of fit and the second mean square error into the following formula to calculate the second fitting score: ； Among them, is the second goodness of fit, is the second mean squared error; Refer to the ratio between the first fitting score and the second fitting score to configure a first weight for furfural and a second weight for cellulose; Calculate the product of the reference aging time corresponding to furfural and the first weight as the first weighted time; Calculate the product of the reference aging time corresponding to cellulose and the second weight as the second weighted time; Calculate the sum of the first weighted time and the second weighted time as the target aging time of the insulation paper.

2. The method according to claim 1, characterized in that, The constructing of the objective functions for all the decomposition products respectively under an aging model of the same structure includes: Determine the kinetic model, where the kinetic model represents the relationship between the degree of polymerization of the insulation paper and the aging time of the insulation paper; For each of the decomposition products, a reference function with the same structure is fitted, and the reference function with the same structure represents the relationship between the index value of the decomposition product in the insulating oil and the degree of polymerization of the insulating paper; Substitute the reference functions of all the decomposition products into the kinetic model to eliminate the degree of polymerization of the insulating paper, and obtain the objective function.

3. The method according to claim 2, wherein, the decomposition products include furfural and cellulose; the kinetic model is: ； the reference function fitted for the furfural is: ； the reference function fitted for the cellulose is: ； the objective function constructed for the furfural is: ； the objective function constructed for the cellulose is: ； Among them, is the degree of polymerization of the aged insulating paper, is the degree of polymerization of the insulating paper before aging, is the aging rate, is the aging time, , , and are all fitting coefficients, is the content of the furfural in the insulating oil, is the ratio between the blue ratio and the red ratio in the dispersion color image presented by the cellulose in the insulating oil.

4. The method according to any one of claims 1-3, wherein, the decomposition products include furfural and cellulose; detecting the index value of each decomposition product in the insulating oil, including: detecting the content of furfural in the insulating oil; detecting the dispersion color image of the cellulose with a quantity greater than or equal to 110 in the insulating oil; calculating the ratio between the blue ratio and the red ratio in each frame of the dispersion color image respectively; for each decomposition product, substituting the index value into the objective function to calculate the aging time of the insulating paper as the reference aging time, including: for the furfural, substituting the index value into the following formula to calculate the aging time of the insulating paper as the reference aging time: ； for the cellulose, substituting each ratio into the following formula to calculate the aging time of the insulating paper as the reference aging time: ； calculating the average value of all the reference aging times of the cellulose as the new reference aging time; Among them, is the degree of polymerization of the aged insulating paper, is the degree of polymerization of the insulating paper before aging, is the aging rate, is the aging time, , , and are all fitting coefficients, is the content of the furfural in the insulating oil, is the ratio between the blue ratio and the red ratio in the dispersion color image presented by the cellulose in the insulating oil.

5. The method according to claim 1, wherein, the objective function of the furfural is obtained by substituting the reference function of the furfural into the kinetic model to eliminate the degree of polymerization of the insulating paper; the objective function of the cellulose is obtained by substituting the reference function of the cellulose into the kinetic model to eliminate the degree of polymerization of the insulating paper; the kinetic model represents the relationship between the degree of polymerization of the insulating paper and the aging time of the insulating paper.

6. An insulating paper aging detection device based on decomposition products, wherein, comprising: a decomposition product determination module for determining at least two decomposition products resulting from the aging decomposition of the insulating paper located in the insulating oil of an oil-immersed transformer; an objective function construction module for constructing an objective function for each of the decomposition products under the same-structured aging model, and the objective function represents the relationship between the index value of the decomposition product in the insulating oil and the aging time of the insulating paper; an index value detection module for detecting the index value of each decomposition product in the insulating oil; a reference aging time calculation module for, for each decomposition product, substituting the index value into the objective function to calculate the aging time of the insulating paper as the reference aging time; an objective aging time fusion module for fusing the reference aging times corresponding to all the decomposition products into the objective aging time of the insulating paper; Among them, the decomposition products include furfural and cellulose, and the target aging time fusion module is specifically used for: Query the reference function fitted during the process of constructing the target parameters for the furfural. The reference function fitted for the furfural represents the relationship between the content of the furfural in the insulating oil and the degree of polymerization of the insulating paper; query the first fitting index of the reference function fitted for the furfural. The first fitting index includes the first goodness of fit and the first mean square error, and the first fitting index characterizes the performance of the reference function fitted for the furfural. Query the reference function fitted during the process of constructing the target parameters for the cellulose. The reference function fitted for the cellulose represents the relationship between the ratio of the blue proportion to the red proportion in the dispersion color image presented by the cellulose in the insulating oil and the degree of polymerization of the insulating paper; query the second fitting index of the reference function fitted for the cellulose. The second fitting index characterizes the performance of the reference function fitted for the cellulose, and the second fitting index includes the second goodness of fit and the second mean square error. Substitute the first goodness of fit and the first mean square error into the following formula to calculate the first fitting score: ； Among them, is the first goodness of fit, is the first mean square error; Substitute the second goodness of fit and the second mean square error into the following formula to calculate the second fitting score: ； Among them, is the second goodness of fit, is the second mean square error; Configure a first weight for the furfural and a second weight for the cellulose with reference to the ratio between the first fitting score and the second fitting score. Calculate the product of the reference aging time corresponding to the furfural and the first weight as the first weighted time. Calculate the product of the reference aging time corresponding to the cellulose and the second weight as the second weighted time. Calculate the sum of the first weighted time and the second weighted time as the target aging time of the insulating paper.

7. An electronic device Characterized in that The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor so that the at least one processor can execute the decomposition product-based insulating paper aging detection method according to any one of claims 1-5.

8. A computer-readable storage medium Characterized in that The computer-readable storage medium stores a computer program, and the computer program is used to implement the decomposition product-based insulating paper aging detection method according to any one of claims 1-5 when executed by a processor.

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