A method and system for epoxy insulator insulation deterioration analysis and fault diagnosis

Abstract

The application discloses a kind of epoxy resin insulator insulation deterioration analysis and fault diagnosis method and system, belong to insulator deterioration analysis technical field, including: the appearance of the deteriorated insulator is detected;The whole set of insulation of the deteriorated insulator is measured, leakage current test and initial discharge voltage test are carried out to insulation resistance, interlayer insulation is measured to insulation resistance;From the deteriorated insulator, insulator sample and dirt are taken, microtopography observation and infrared spectrum analysis are carried out to sample, and dirt is analyzed by energy spectrum and pH value;According to the above detection analysis result, the deteriorated insulator is analyzed, and the deterioration level and reason are obtained.The level and reason of insulation deterioration are determined in multiple aspects, so that the epoxy resin insulator is prevented and maintained specifically, and the occurrence of insulator insulation deterioration problem is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulator insulation deterioration analysis, and particularly relates to an epoxy insulator insulation deterioration analysis and fault diagnosis method and system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The epoxy insulator is one of the main insulation forms of high-voltage power equipment, which not only bears the insulation function but also bears the supporting function, and needs to bear a certain stress function in operation. Many power equipment failures are caused by internal insulation deterioration, and the main cause of insulation deterioration is the partial discharge caused by the internal insulation medium deterioration of the power equipment in operation.

[0004] In recent years, the epoxy insulators used in substations have successively appeared insulation deterioration phenomenon in operation, which often causes flashover failure. The previous treatment method is passive, that is, the epoxy insulator is replaced after the failure or test anomaly, and the device loss and power outage range are large. There is a lack of analysis of the insulation deterioration reason of the epoxy insulator, and the insulation deterioration of the epoxy insulator cannot be prevented and maintained according to the insulation deterioration reason, that is, the insulation deterioration problem of the epoxy insulator cannot be prevented. SUMMARY

[0005] In order to solve the above problems, the present application provides an epoxy insulator insulation deterioration analysis and fault diagnosis method and system, which can analyze the insulation deterioration of the epoxy insulator from multiple aspects, so as to determine the level and reason of the insulation deterioration, and can prevent and maintain the insulation deterioration of the epoxy insulator according to the insulation deterioration reason, and effectively prevent the insulation deterioration problem of the epoxy insulator.

[0006] To achieve the above purpose, the present application adopts the following technical scheme:

[0007] In a first aspect, an epoxy insulator insulation deterioration analysis and fault diagnosis method is provided, comprising:

[0008] The appearance of the deteriorated insulator is detected to obtain appearance detection data;

[0009] The whole group insulation of the deteriorated insulator is measured for insulation resistance, tested for leakage current and tested for initial discharge voltage, and the interlayer insulation is measured for insulation resistance to obtain whole group insulation resistance data, leakage current data, initial discharge voltage data and local insulation resistance data;

[0010] Obtaining the deterioration level and cause by deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole set of insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration topography observation result, the spectrum analysis result, the energy spectrum analysis result and the acid-base degree analysis result.

[0011] Obtaining the deterioration level and cause by deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole set of insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration topography observation result, the spectrum analysis result, the energy spectrum analysis result and the acid-base degree analysis result.

[0012] In a second aspect, an epoxy insulator insulation deterioration analysis and fault diagnosis system is provided, comprising:

[0013] A data acquisition module is configured to acquire appearance detection data, whole set of insulation resistance data, leakage current data, initial discharge voltage data, local insulation resistance data, deterioration topography observation result, spectrum analysis result, energy spectrum analysis result and acid-base degree analysis result of the deteriorated insulator.

[0014] The appearance detection data is obtained by detecting the appearance of the deteriorated insulator; the whole set of insulation resistance data, the leakage current data and the initial discharge voltage data are obtained by measuring the insulation resistance, testing the leakage current and testing the initial discharge voltage of the whole set of insulation of the deteriorated insulator; the local insulation resistance data is obtained by measuring the insulation resistance of the interlayer insulation of the deteriorated insulator; the deterioration topography observation result and the spectrum analysis result are obtained by taking an insulator sample from the deteriorated insulator and observing the micro topography and performing infrared spectrum analysis on the sample; and the energy spectrum analysis result and the acid-base degree analysis result are obtained by performing energy spectrum analysis and acid-base degree analysis on the dirt on the surface of the deteriorated insulator.

[0015] A deterioration analysis module is configured to perform deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole set of insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration topography observation result, the spectrum analysis result, the energy spectrum analysis result and the acid-base degree analysis result, and obtain the deterioration level and cause.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. This invention provides a comprehensive analysis of the deterioration of insulators from various aspects, including visual inspection of deteriorated insulators, measurement of insulation resistance of the entire insulation assembly, leakage current testing, initial discharge voltage testing, measurement of insulation resistance of interlayer insulation, microscopic morphology observation, infrared spectral analysis, energy spectrum analysis of contaminants, and pH analysis. This analysis reveals the level and causes of deterioration, enabling targeted prevention and maintenance of epoxy resin insulators based on the causes of insulation degradation. This effectively prevents the occurrence of epoxy resin insulator insulation degradation problems, reduces maintenance costs, and ensures the safe and stable operation of the power grid.

[0018] 2. This invention provides a theoretical basis for the detection of epoxy resin insulator insulation by rationally analyzing and explaining insulation degradation, in order to optimize the operating environment of this type of epoxy resin insulator, improve the manufacturing process of epoxy resin insulator, explore cleaning and insulation restoration methods for epoxy resin insulator, and hope to improve its operational stability, reduce failure rate, save replacement costs of epoxy resin insulator, reduce losses caused by power outages, and protect the safe and stable operation of the power grid.

[0019] 3. This invention analyzes various acquired data through an insulator health status identification model, identifies the health status of the insulator, quantifies the level of insulator degradation, and achieves a comprehensive evaluation of the insulator.

[0020] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] Figure 1 This is a flowchart of the method disclosed in Example 1;

[0023] Figure 2 This is a schematic diagram of the insulator health status identification principle disclosed in Example 1. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0027] Embodiment 1

[0028] Epoxy resin material is widely used in high-voltage electrical switch, explosion-proof electrical, current transformer, voltage transformer and large motor insulation support due to its excellent characteristics of insulation, heat resistance, corrosion resistance and good mechanical properties, and is one of the insulating materials of insulators.

[0029] Epoxy resin insulator is one of the main insulation forms of high-voltage power equipment, which not only bears the insulation function, but also bears the supporting function, and needs to bear a certain stress function in operation. Many power equipment failures are caused by internal insulation deterioration, and the main cause of insulation deterioration is the partial discharge caused by the deterioration of the internal insulation medium of the power equipment in operation.

[0030] After the epoxy resin casting insulator is poured and cured, bubbles are easily left in the epoxy resin. These bubbles often bear high field strength, thereby causing partial discharge. The energy generated after a long time of partial discharge will slowly deteriorate the epoxy resin insulation. When the deterioration develops to a certain extent, the device will eventually be completely burned out. Moreover, due to the existence of wind, rain, fog, condensation and other adverse conditions in the operating environment of the epoxy resin insulator, water vapor, salt, acidity and other factors cannot be avoided. Under the combined action of factors such as electric field, temperature and mechanical force, the surface is easy to deposit dirt, which may produce a conductive channel and exist a large leakage current, which will evaporate the water in the local area of the epoxy resin surface to form a dry area. If the electric field strength reaches the critical air discharge field strength, arc discharge phenomenon will be caused, and the instantaneous energy generated by the discharge will cause carbonization and corrosion on the surface of the epoxy resin material, thereby gradually deteriorating the insulation performance, which may lead to insulation failure, causing the surface flashover or breakdown of the insulator, and may cause serious accidents. The number of devices using epoxy resin insulators is huge. For large-scale equipment, if a fault is found during operation, the direct replacement method is adopted, and the maintenance cost is huge. In addition, the existence of any defects and faults in the power equipment may affect the overall performance of the equipment, and may cause power failure in the jurisdictional local area or even the entire area, causing significant economic loss and adverse social impact.

[0031] The epoxy resin insulator used in the transformer substation has shown insulation deterioration phenomenon in operation in recent years, which often causes flashover failure. The previous treatment method is passive, that is, to replace after failure or test anomaly, and the device loss and power outage range are large.

[0032] Studies have shown that the microstructure, decomposition products and macroscopic electrical and mechanical properties of the epoxy insulation material change after aging. However, there is still a lack of systematic study on the insulation deterioration of the epoxy resin insulator, and the deterioration mechanism is not clear.

[0033] Therefore, in order to reduce or avoid the failure of power equipment, it is necessary to detect the insulation deterioration degree of the epoxy resin insulator. Since the number of epoxy resin insulators is huge, and insulation deterioration phenomenon has occurred in operation in recent years, if the causes of insulation deterioration of the epoxy resin insulator can be mastered, the insulation deterioration problem can be found in time by cooperating with the related detection method, and the necessary cleaning and insulation recovery of the insulation deteriorated material can greatly reduce the expenditure of repair cost and ensure the safe and stable operation of the power grid.

[0034] In order to solve the above technical problems, the embodiment discloses a kind of epoxy resin insulator insulation deterioration analysis and fault diagnosis method, the deterioration mechanism of epoxy resin insulation of epoxy resin insulator is analyzed, the cause of failure is reasonably analyzed and explained, to provide theoretical basis for the detection of epoxy resin insulator insulation, to optimize the running environment of this type of epoxy resin insulator, improve the manufacturing process of epoxy resin insulator, explore the cleaning and insulation recovery method of epoxy resin insulator, hope to improve its running stability, reduce failure rate, save the replacement cost of epoxy resin insulator, reduce the loss caused by power failure, protect the safe and stable operation of power grid.

[0035] The epoxy resin insulator insulation deterioration analysis and fault diagnosis method disclosed by the embodiment, as shown in Figure 1 It includes:

[0036] S1: detecting the appearance of the deteriorated insulator to obtain appearance detection data.

[0037] Select a fault or deteriorated epoxy resin insulator to be analyzed, denoted as deteriorated insulator, and select a new epoxy resin insulator of the same batch and type as the deteriorated insulator, denoted as normal insulator. The appearance detection items include multiple aspects, as shown in Table 1.

[0038] Table 1 Appearance detection items of epoxy resin insulator

[0039]

[0040]

[0041] The appearance of the deteriorated insulator and the appearance of the normal insulator are detected to obtain corresponding appearance detection data, and the two appearance detection data are compared and analyzed to determine the appearance deterioration level of the deteriorated insulator, which can be verified and supplemented by subsequent macroscopic and microscopic test results to analyze the deterioration mechanism.

[0042] S2: The entire group of insulations of the deteriorated insulator is measured for insulation resistance, leakage current and starting discharge voltage to obtain the entire group of insulation resistance data, leakage current data and starting discharge voltage data; the interlayer insulation of the deteriorated insulator is measured for insulation resistance to obtain local insulation resistance data. Including:

[0043] S21: The entire group of insulations and the interlayer insulation of the deteriorated insulator are measured for insulation resistance R to obtain the entire group of insulation resistance data and the local insulation resistance data, and the insulation performance of the deteriorated insulator is determined through the entire group of insulation resistance data and the local insulation resistance data, and the most serious deterioration position A of the deteriorated insulator is determined according to the local insulation resistance data.

[0044] The entire group of insulations and the interlayer insulation of the deteriorated insulator and the normal insulator are measured for insulation resistance R respectively to obtain corresponding entire group of insulation resistance data and local insulation resistance data, and the insulation performance of the deteriorated insulator and the most serious deterioration position A of the deteriorated insulator are determined by comparing and analyzing the data obtained from the deteriorated insulator and the data obtained from the normal insulator.

[0045] Specifically, the top terminal of the insulator is connected to the direct current voltage, and the insulator umbrella skirt layer is connected to the ground, and the entire group of insulations of the insulator is measured for insulation resistance, and the test selects an insulation shaker, the test is repeated 3 times, the average value is taken and the insulation resistance size R is recorded, as shown in Table 2.

[0046] One layer of the insulator is connected to the direct current voltage, and the layer below is connected to the ground, and the interlayer insulation of the insulator is measured for insulation resistance, and the test selects an insulation shaker, the test is repeated 3 times, the average value is taken and the insulation resistance size Rp is recorded, as shown in Table 3.

[0047] Table 2 Entire group of insulation resistance test

[0048] Epoxy insulator type Number of layers Insulation resistance (Ω) Deteriorated insulator Layer 0 Deteriorated insulator Layer 1 Deteriorated insulator Layer 2 Deteriorated insulator …… Deteriorated insulator Layer k Deteriorated insulator …… Deteriorated insulator Layer N Normal insulator Layer 0 Normal insulator Layer 1 Normal insulator Layer 2 Normal insulator …… Normal insulator Layer k Normal insulator …… Normal insulator Layer N

[0049] Table 3 Interlayer insulation resistance test

[0050]

[0051]

[0052] The insulation resistance R of the whole insulation and interlayer insulation of the deteriorated insulator and the normal insulator is measured respectively, the results of the comparison test are determined, the insulation performance of the whole insulation and interlayer insulation of the deteriorated insulator is determined, the partial insulation resistance data of the deteriorated insulator and the normal insulator is compared, the position of the umbrella skirt layer with the maximum difference of the partial insulation resistance data is selected as the most serious position A of the deteriorated insulator, and it is indicated that the local deterioration level of this position is higher than that of other positions, and preparation is made for subsequent microscopic detection.

[0053] S22: The leakage current test is performed on the whole insulation of the deteriorated insulator, the leakage current data is obtained, and the pollution level of the deteriorated insulator and the most serious position B of the deteriorated insulator are determined through the leakage current data.

[0054] The leakage current test is performed on the whole insulation of the deteriorated insulator and the normal insulator respectively, and the corresponding leakage current data is obtained, and specifically:

[0055] The leakage current test is performed on the deteriorated insulator and the normal insulator using a direct current high voltage generator and a microammeter, different voltages U1, U2 and U3 (none of which will damage the insulator) are selected, the top terminal of the insulator is connected to the direct current high voltage, and the umbrella skirt layer of the insulator is grounded, the leakage current size i of the top terminal to different umbrella skirt layers under U1, U2 and U3 voltages is tested respectively and recorded as shown in Table 4. The leakage current is a direct and effective dynamic parameter for characterizing the pollution level of the epoxy resin insulator at present, and it is a result and comprehensive reflection of the combined action of the surface pollution of the epoxy resin insulator and the environment.

[0056] Table 4 Leakage current test

[0057]

[0058] The leakage current data of the deteriorated insulator and the leakage current data of the normal insulator are compared, the pollution level of the deteriorated insulator is determined, and the position of the umbrella skirt layer with the maximum difference of the leakage current is selected as position B, which indicates that the local deterioration level of this position is higher than that of other positions, and preparation is made for subsequent microscopic detection.

[0059] S23: The initial discharge voltage test is performed on the whole insulation of the deteriorated insulator, the initial discharge voltage data is obtained, and through the initial discharge voltage data, whether there is a weak position on the surface of the deteriorated insulator which is easy to induce partial discharge is determined, and whether the surface deterioration trace will affect the local insulation performance is judged. Specifically:

[0060] The initial discharge voltage test is performed on the whole insulation of the normal insulator, and the initial discharge voltage data of the normal insulator is obtained;

[0061] Comparing the initial discharge voltage data of the normal insulator with the initial discharge voltage data of the deteriorated insulator, a corresponding initial discharge voltage drop degree is obtained, which is the insulation drop degree of the deteriorated insulator;

[0062] The insulation drop degree is used to determine whether there is a weak part on the surface of the deteriorated insulator that is prone to induce partial discharge, and to determine whether the surface deterioration trace will affect the partial insulation performance.

[0063] The test transformer and the ultrahigh frequency partial discharge sensor are used to test the partial initial discharge voltage of the deteriorated insulator and the normal insulator, and in this process, the control voltage is controlled so as not to damage the epoxy insulator.

[0064] One of the terminals of the insulator is connected to a high-voltage electrode, and the bottom terminal is connected to the ground. The external voltage is gradually increased from 0 kV to a higher level by using the test transformer, and the voltage increasing speed is 0.5 kV / s. After each voltage increase, 10 s is waited, and whether discharge occurs is determined by the ultrahigh frequency sensor. The time when the first obvious discharge occurs is recorded, and then the voltage is decreased to 0 kV. After each test, 10 min is waited, and the above steps are repeated. The average value is taken for three times. By comparing the initial discharge voltage U pdiv of the deteriorated insulator with the initial discharge voltage U pdiv of the normal insulator, and calculating the drop degree of U pdiv , it can be determined whether there is a weak part on the surface of the deteriorated epoxy insulator that is prone to induce partial discharge. The appearance detection data and the insulation drop degree of the corresponding position are comprehensively analyzed to determine whether the surface deterioration trace will affect the partial insulation performance, so as to prepare for the analysis of the deterioration mechanism.

[0065] If it is found through the initial discharge voltage test that the insulator or the part with lower initial discharge voltage also has more serious deterioration in the appearance detection, it can be explained that the insulation drop (lower initial discharge voltage) is caused by external deterioration trace, or it can be explained that there is consistency between the two.

[0066] S3: Taking the insulator sample and the dirt from the deteriorated insulator, and observing the micro morphology and performing infrared spectrum analysis on the sample to obtain the deterioration morphology observation result and the spectrum analysis result;

[0067] Performing energy spectrum analysis and acid-base value analysis on the dirt to obtain the energy spectrum analysis result and the acid-base value analysis result;

[0068] Determining the deterioration cause of the deteriorated insulator through the deterioration morphology observation result, the spectrum analysis result, the energy spectrum analysis result and the acid-base value analysis result.

[0069] It comprises:

[0070] The insulator sample is taken from the position A or the position B, or the insulator sample is taken from both the position A and the position B.

[0071] From the deteriorated insulator, a sheet sample is taken, and the sample size is not more than 20mm*20mm*4mm, and at the same time, the same size sample is taken at the corresponding position of the normal insulator.

[0072] After sampling, the scanning electron microscope is used to detect the micro-morphology of the sample, and the deteriorated morphology observation result is obtained. The model of the scanning electron microscope can be Navigator-100 high-throughput scanning electron microscope. The deteriorated morphology of the surface of the sampling area is observed, and the following aspects are mainly concerned:

[0073] (1) Whether there are traces of ablation of the epoxy resin matrix, whether there are bubbles or pores, which can be used to infer whether gasification and carbonization of substances occur during the deterioration process, and whether decomposition of the epoxy resin occurs. If the above phenomena occur, it can be inferred that the discharge and current ablation are the direct cause of the degradation and deterioration of the epoxy resin matrix.

[0074] (2) Carefully observe the shape, size, and distribution density of the surface contamination, and infer that the surface contamination is the carbonized trace generated by the discharge or the precipitate of the epoxy resin material, or the inorganic salt accumulated in the air.

[0075] (3) Compare the differences in surface morphology between the deteriorated insulator and the normal insulator, identify which substances are not present in the normal insulator, and whether the surface morphology of the two is only different in surface substances, whether the insulating surface of the deteriorated insulator has been eroded, and whether there are pits, cracks, holes, etc.

[0076] Subsequently, the infrared absorption spectrum of the local sample of the deteriorated insulator and the local sample of the normal insulator is tested using a microscopic infrared test analyzer. The model of the infrared spectrum analyzer can be iN10MX microscopic imaging infrared spectrometer. The microscopic infrared spectrometer realizes a kind of microscopic analysis technology by combining the infrared microscope and the Fourier infrared spectrometer. Moreover, for the microscopic infrared, it has the advantages of not damaging the sample, not being high in requirements for the size and shape of the sample, and irregularly shaped samples can also be tested. The detection sensitivity is high, which can reach nanogram level (ng); the measurement area is small, which can reach micrometer level (5um); the sample can be scanned in area and line, and the infrared spectrum imaging and analysis of the material can be performed. The measurement principle of the microscopic infrared spectrum is that the high-throughput light beam is focused on the small area of the sample with high precision to obtain the infrared spectrum that can be used for analysis. This technology has high sensitivity, and perfect infrared spectrum graph can be obtained using a small amount of sample. It has important applications in the fields of biology, medicine, mineralogy, material science, and forensic science.

[0077] After infrared analysis, the position of absorption peaks and the corresponding functional groups in the infrared spectrum of the epoxy resin, such as -OH group, -CH3, aliphatic structure, Si-O bond, C=O in ester group, C-C in aliphatic, C-O-C in aliphatic, C-H in aromatic, C-H in CH3, etc. can be obtained. Based on this, it can be inferred whether hydrolysis of ester group, degradation of epoxy resin matrix, hydrolysis of glass fiber and ion exchange occur in the deteriorated insulator, and whether the deterioration is caused by moisture, salt, acid factors, or discharge induced by the above factors to produce carbonization marks, etc.

[0078] The dirt on the surface of the deteriorated insulator is collected from the position with the most dirt or from position A or position B, and then the dirt is subjected to energy spectrum analysis and pH value analysis.

[0079] Specifically, the surface dirt on the surface of the deteriorated insulator or the most deteriorated position of the deteriorated insulator is gently scraped and collected at least 1 g, and a total of 3 dirt samples are collected, and then subjected to energy spectrum analysis. The instrument can be an X-ray photoelectron spectrometer of AXIS Ultra DLD type. The AXIS Ultra DLD multifunctional X-ray photoelectron spectrometer can provide chemical information about the solid surface and interface, can analyze all elements except hydrogen and helium, including element type and valence state, and can provide semi-quantitative analysis of the relative content of the measured elements. The most characteristic is that XPS can measure the chemical valence state of elements and the influence of chemical environment, which can provide element depth distribution information through angle resolution method and Ar ion stripping method, mainly used for the composition of the surface of solid samples, and can be used for qualitative and semi-quantitative analysis.

[0080] The collected dirt is subjected to element energy spectrum analysis using an X-ray photoelectron spectrometer, and the absorption peak intensity spectrum of elements such as Al, Si, C, O, Cu, etc. can be obtained, from which it can be inferred which substances are accumulated on the surface and which substances are generated, so as to further analyze which factors induce what process to cause the insulation deterioration of the epoxy resin insulator.

[0081] The collected 3 dirt samples are subjected to acid-base value test, and the test instrument can be a pH meter. The pH value is measured repeatedly for 3 times, and the average value of the pH value is obtained. According to whether the pH value is greater than, equal to or less than 7, it is judged whether it is acidic, neutral or alkaline, and then it is inferred whether there is an acid or alkaline substance dissolved in water and attached to the surface of the epoxy resin insulator during operation. According to the analysis of the substances on the surface of the epoxy resin insulator, the deterioration process is further analyzed, and it is inferred how the operating environment affects the epoxy resin insulator, such as whether there is salt mist or acid rain, etc.

[0082] After the above tests, the following problems can be further analyzed:

[0083] (1) Is the degradation of the epoxy resin insulator itself or caused by external factors?

[0084] (2) What kind of physical or chemical reaction may occur during operation?

[0085] (3) What substances are generated on the surface of the degraded epoxy resin insulator?

[0086] (4) Is there a way to restore the insulation performance of the epoxy resin insulator by cleaning?

[0087] (5) Are there countermeasures to prevent the generation of these substances in actual operation or during regular maintenance?

[0088] (6) Can there be a method to detect the surface substances that affect the insulation performance of the epoxy resin insulator during maintenance?

[0089] (7) Can external electric field, temperature, mechanical force, and other factors be reasonably controlled to prevent the generation of discharge on the surface of the epoxy resin insulator?

[0090] (8) Can the manufacturing process of the epoxy resin insulator itself be improved to have properties such as acid corrosion resistance, high temperature resistance, and prevention of dirt accumulation, so as to be immune to external factors and difficult to degrade?

[0091] S4: The appearance detection data, overall insulation resistance data, leakage current data, initial discharge voltage data, local insulation resistance data, degradation morphology observation results, spectral analysis results, energy spectrum analysis results, and pH analysis results are identified by the insulator health state identification model to obtain insulator health state identification results, as shown in Table 2. Figure 2

[0092] After the degraded insulator is detected by S1-S3 steps, the obtained detection results are linearly mapped from degradation to no degradation as numerical values 1-10, so as to digitize each detection result, establish a database of each detection result, and then divide the samples of the database into different health state types based on the value of each result. According to the fault severity, the health level is divided into five levels as shown in Table 5.

[0093] Table 5 Health state classification of epoxy resin insulator

[0094] Grade (characterized by a numerical value) Epoxy insulator health status 1 Insulation about to fail 2 Very severe deterioration 3 Moderately severe deterioration 4 Mildly deteriorated insulation 5 Very good insulation

[0095] ​The insulator health state recognition model adopts a machine learning algorithm such as an artificial neural network, a support vector machine or a naive Bayes model, obtains various detection data of the insulator for training, trains the machine learning algorithm model such as the artificial neural network, the support vector machine or the naive Bayes model constructed by using the training data, and obtains the insulator health state recognition model.

[0096] After digitizing the detection results of the S1-S3 steps, the detection results are input into the insulator health state recognition model to obtain the insulator health state recognition result, and comprehensive evaluation of the deteriorated insulator is realized.

[0097] The method disclosed in the embodiment can be widely used in detection and treatment of insulation deterioration of epoxy resin insulators of various voltage levels, can analyze, infer and diagnose the reasons for insulation deterioration and specific fault of the epoxy resin insulators, provides a reference basis for improving the operation environment and manufacturing process of the epoxy resin insulators, helps to improve the operation stability of the epoxy resin insulators, prolong the service life, reduce the number of fault occurrences, and avoid equipment and personal injury caused by insulation deterioration and flashover. The method can also effectively detect the insulation condition of the epoxy resin insulators, provide a theoretical basis for researching the insulation recovery method of the epoxy resin insulators, save maintenance costs, and ensure safe and stable operation of the power grid.

[0098] Embodiment 2

[0099] In this embodiment, an epoxy resin insulator insulation deterioration analysis and fault diagnosis system is disclosed, comprising:

[0100] A data acquisition module is configured to acquire appearance detection data, whole-group insulation resistance data, leakage current data, initial discharge voltage data, local insulation resistance data, deterioration morphology observation results, spectral analysis results, energy spectrum analysis results and pH value analysis results of the deteriorated insulator.

[0101] The appearance detection data is obtained by detecting the appearance of the deteriorated insulator; the whole-group insulation resistance data, the leakage current data and the initial discharge voltage data are obtained by measuring the insulation resistance, testing the leakage current and testing the initial discharge voltage of the whole-group insulation of the deteriorated insulator; the local insulation resistance data is obtained by measuring the insulation resistance of the interlayer insulation of the deteriorated insulator; the deterioration morphology observation results and the spectral analysis results are obtained by taking an insulator sample from the deteriorated insulator, observing the micro morphology of the sample and performing infrared spectral analysis on the sample; the energy spectrum analysis results and the pH value analysis results are obtained by performing energy spectrum analysis and pH value analysis on the dirt on the surface of the deteriorated insulator.

[0102] The deterioration analysis module is configured to perform deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole set of insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration topography observation result, the spectral analysis result, the energy spectrum analysis result, and the pH value analysis result, to obtain the deterioration level and the cause.

[0103] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the equivalent, without departing from the spirit and scope of the present application, any modification or equivalent replacement, which should be covered within the protection scope of the claims of the present application.

Claims

1. An epoxy resin insulator deterioration analysis and failure diagnosis method characterized by, The method comprises the following steps: detecting the appearance of the deteriorated insulator to obtain appearance detection data; measuring the insulation resistance of the whole insulation of the deteriorated insulator, testing the leakage current and the initial discharge voltage, measuring the insulation resistance of the interlayer insulation, and obtaining the whole insulation resistance data, the leakage current data, the initial discharge voltage data and the local insulation resistance data; taking insulator samples and contaminants from the deteriorated insulator, observing the micro-morphology of the samples, and performing infrared spectrum analysis on the samples and energy spectrum analysis and pH value analysis on the contaminants, to obtain the deterioration morphology observation results, the spectrum analysis results, the energy spectrum analysis results and the pH value analysis results; performing deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration morphology observation results, the spectrum analysis results, the energy spectrum analysis results and the pH value analysis results, to obtain the deterioration level and the cause; determining the most serious deterioration position A of the deteriorated insulator according to the local insulation resistance data; determining the most serious deterioration position B of the deteriorated insulator according to the leakage current data; taking insulator samples from the position A or the position B, or taking insulator samples from both the position A and the position B; measuring the insulation resistance of the interlayer insulation of the normal insulator to obtain the local insulation resistance data of the normal insulator; comparing the local insulation resistance data of the deteriorated insulator with the local insulation resistance data of the normal insulator, and selecting the position A of the umbrella skirt layer with the largest difference in the local insulation resistance data as the position A; identifying the appearance detection data, the whole insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration morphology observation results, the spectrum analysis results, the energy spectrum analysis results and the pH value analysis results through an insulator health state identification model to obtain the insulator health state identification results; the insulator health state identification model adopts an artificial neural network, a support vector machine or a naive Bayes model.

2. An epoxy resin insulator deterioration analysis and failure diagnosis method according to claim 1, characterized by, determining the appearance deterioration level of the deteriorated insulator through the appearance detection data; determining the insulation performance of the deteriorated insulator through the whole insulation resistance data and the local insulation resistance data; determining the contamination level of the deteriorated insulator through the leakage current data; determining whether there is a weak position on the surface of the deteriorated insulator which is easy to induce partial discharge, and judging whether the surface deterioration trace will affect the local insulation performance through the initial discharge voltage data; determining the deterioration cause of the deteriorated insulator through the deterioration morphology observation results, the spectrum analysis results, the energy spectrum analysis results and the pH value analysis results.

3. The method of claim 1, wherein the method is characterized by: testing the initial discharge voltage of the whole insulation of the normal insulator to obtain the initial discharge voltage data of the normal insulator; comparing the initial discharge voltage data of the normal insulator with the initial discharge voltage data of the deteriorated insulator to obtain the degree of decline of the initial discharge voltage, which is the insulation decline degree of the deteriorated insulator; determining whether there is a weak position on the surface of the deteriorated insulator which is easy to induce partial discharge, and judging whether the surface deterioration trace will affect the local insulation performance through the insulation decline degree.

4. The method of claim 1, wherein the epoxy insulator deterioration analysis and failure diagnosis method is characterized by, testing the leakage current of the whole insulation of the normal insulator to obtain the leakage current data of the normal insulator; The leakage current data of the deteriorated insulator is compared with the leakage current data of the normal insulator, and the position B is selected as the position of the umbrella skirt layer with the largest leakage current difference.

5. The method of claim 1, wherein the method is characterized by: The dirt is collected from the position with the most dirt on the surface of the deteriorated insulator, or from the position A or the position B.

6. An epoxy resin insulator insulation deterioration analysis and fault diagnosis system employing an epoxy resin insulator insulation deterioration analysis and fault diagnosis method according to any one of claims 1 to 5, characterized by The method comprises the steps of: a data acquisition module is configured to acquire appearance detection data, whole-group insulation resistance data, leakage current data, initial discharge voltage data, local insulation resistance data, deterioration topography observation results, spectral analysis results, energy spectrum analysis results and pH value analysis results of the deteriorated insulator; wherein the appearance detection data is obtained by detecting the appearance of the deteriorated insulator; the whole-group insulation resistance data, the leakage current data and the initial discharge voltage data are obtained by measuring the insulation resistance, testing the leakage current and testing the initial discharge voltage of the whole-group insulation of the deteriorated insulator; the local insulation resistance data is obtained by measuring the insulation resistance of the interlayer insulation of the deteriorated insulator; the deterioration topography observation results and the spectral analysis results are obtained by taking an insulator sample from the deteriorated insulator, and observing the micro topography and performing infrared spectral analysis on the sample; the energy spectrum analysis results and the pH value analysis results are obtained by performing energy spectrum analysis and pH value analysis on the dirt on the surface of the deteriorated insulator; a deterioration analysis module is configured to perform deterioration analysis on the deteriorated insulator according to the appearance detection data, the whole-group insulation resistance data, the leakage current data, the initial discharge voltage data, the local insulation resistance data, the deterioration topography observation results, the spectral analysis results, the energy spectrum analysis results and the pH value analysis results, and obtain the deterioration level and the cause.

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