Fault Detection and Analysis Methods for Power Equipment

Abstract

The present invention provides a method for detecting and analyzing faults of electric power equipment, which belongs to the technical field of fault analysis, and includes: obtaining a standard thermal imaging image when each object to be tested is in a normal state according to the type of electric power equipment. When the electric power equipment is actually running, the parameters are adjusted to the same situation as when the standard image is obtained, and a thermal imaging state image of multiple objects to be tested is taken. The temperature value corresponding to the state image is compared with the temperature value in the standard image to determine whether each object to be tested has a fault. The method for detecting and analyzing faults of electric power equipment provided by the present invention provides reliable data support for fault judgment of the object to be tested by determining the standard image. The state of the object to be tested can be quickly determined based on the standard image, thereby improving the accuracy of locating the faulty object to be tested and the monitoring efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of fault analysis, and more specifically, relates to a method for detecting and analyzing faults of electric power equipment. Background Art

[0002] With the rapid development of science and technology, the requirements for the power industry have also been gradually improved. At present, my country is vigorously developing smart substations and building big data platforms. Since power equipment is in operation for a long time and is affected by environmental factors, it will produce different levels of faults, which will cause certain harm to the safety and stability of the power system. Therefore, fault detection and analysis of power equipment is a very important part of smart grids. Effective monitoring of different types of power equipment and real-time and automatic analysis of whether power equipment has faults, fault degree, fault location, and fault time prediction have become research hotspots.

[0003] The power equipment includes multiple devices and components, which can be collectively referred to as the object to be tested. The existing method is to determine the operating status of the object to be tested by taking thermal images, but thermal images are easily affected by the surrounding environment, and there will be temperature transfer between the objects to be tested, which ultimately leads to the inability to effectively identify the status of the object to be tested, and the fault analysis efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide a method for detecting and analyzing faults of electric power equipment, aiming to solve the problem that the state of an object to be tested cannot be effectively identified and the fault analysis efficiency is low.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a method for detecting and analyzing faults of electric power equipment, comprising:

[0006] According to the type of power equipment, obtain a standard thermal imaging image when each object under test is in a normal state;

[0007] When the electric power equipment is actually running, the parameters are adjusted to the same conditions as when the standard image is obtained, and the current thermal imaging state images of the plurality of objects to be tested are photographed;

[0008] The temperature value corresponding to the state diagram is compared with the temperature value in the standard diagram to determine whether each of the objects under test has a fault.

[0009] In a possible implementation, before adjusting the parameters to the same state as when acquiring the standard image, taking the current plurality of thermal imaging state images of the objects to be tested further includes:

[0010] When it is determined that the object to be measured has a fault and the temperature of the object to be measured is the highest, the temperatures of the other objects to be measured are checked based on the temperature of the object to be measured.

[0011] In a possible implementation, the checking the temperature of the other objects to be measured based on the temperature of the object to be measured includes:

[0012] Taking the faulty object to be tested as the center of the circle, according to the current ambient temperature, the temperature attenuation rate is determined to determine the temperature attenuation values ​​corresponding to different distances;

[0013] Pick up the temperature value of the other objects to be measured in the state diagram, and subtract the attenuation value from the temperature value to obtain the actual temperature condition.

[0014] In a possible implementation, obtaining a standard image of thermal imaging when each object to be tested is in a normal state includes:

[0015] In the standard diagram, the temperature standard value of each of the objects to be measured is picked up and recorded according to the contour of each of the objects to be measured, and the standard value is used to compare with the temperature value in the state diagram.

[0016] In a possible implementation manner, comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram includes:

[0017] The temperature value corresponding to the state diagram is subtracted from the standard value, and the rise and fall of the temperature of each of the objects to be measured is determined according to the result of the subtraction.

[0018] In a possible implementation, judging the temperature rise and fall of each of the objects to be tested according to the result of the difference includes:

[0019] A judgment value is set to judge whether the object to be tested is normal or not. If the absolute value of the difference between the temperature value corresponding to the state diagram and the temperature value in the standard diagram is greater than the judgment value, the object to be tested has a fault.

[0020] In a possible implementation manner, before comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram, the method further includes:

[0021] The electric power equipment is divided into various areas, and the operating conditions of each of the objects to be tested in the area are determined based on the area.

[0022] In a possible implementation, dividing the electric power equipment into various areas and judging the operating status of each of the objects under test in the area by the area includes:

[0023] According to the data flow and the transmission relationship of electric energy, the electric equipment is divided into the various areas;

[0024] When a certain object under test in the area fails and has an abnormal temperature, the object under test and the object under test located at the front end of the connection relationship with the object under test are detected.

[0025] In a possible implementation manner, after detecting the object to be tested and the object to be tested located at the front end of the connection relationship between the object to be tested, the method further includes:

[0026] A database is established, and corresponding fault solutions are retrieved from the database according to the temperature changes of the objects to be tested located in the same area.

[0027] In a possible implementation, retrieving a corresponding fault solution from the database includes:

[0028] The temperature conditions of the objects to be tested in the same area are used as keywords, and the scope is appropriately expanded based on the keywords to retrieve the corresponding faults of the objects to be tested and the solutions from the database.

[0029] The beneficial effect of the electric power equipment fault detection and analysis method provided by the present invention is that, compared with the prior art, the electric power equipment fault detection and analysis method of the present invention obtains a standard thermal imaging image of each object to be tested in a normal state according to the type of the electric power equipment.

[0030] When the power equipment is actually running, the relevant instruments are used to obtain multiple thermal forming pictures of the object under test and the standard picture under the same conditions, that is, the state picture. Then the state picture is compared with the standard picture, and by comparing the temperature values ​​of the two pictures, it can be judged whether the object under test is in a normal state or has a fault.

[0031] In the present application, by determining the standard diagram, reliable data support is provided for fault judgment of the object to be tested. The state of the object to be tested can be quickly determined based on the standard diagram, thereby improving the accuracy of locating the faulty object to be tested and the monitoring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1A flow chart of a method for detecting and analyzing faults of electric power equipment provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] See also Figure 1 The power equipment fault detection and analysis method provided by the present invention is now described. The power equipment fault detection and analysis method comprises:

[0036] According to the type of power equipment, obtain a standard thermal imaging image when each object under test is in a normal state.

[0037] When the power equipment is actually running, the parameters are adjusted to the same conditions as when the standard image is obtained, and thermal imaging status images of multiple current objects under test are taken.

[0038] Compare the temperature values ​​corresponding to the state diagram with the temperature values ​​in the standard diagram to determine whether each object under test has a fault.

[0039] The beneficial effect of the electric power equipment fault detection and analysis method provided by the present invention is that, compared with the prior art, the electric power equipment fault detection and analysis method of the present invention obtains a standard thermal imaging image of each object to be tested in a normal state according to the type of the electric power equipment.

[0040] When the power equipment is actually running, the relevant instruments are used to obtain multiple thermal forming pictures of the object under test and the standard picture under the same conditions, that is, the state picture. Then the state picture is compared with the standard picture, and by comparing the temperature values ​​of the two pictures, it can be judged whether the object under test is in a normal state or has a fault.

[0041] In the present application, by determining the standard diagram, reliable data support is provided for fault judgment of the object to be tested. The state of the object to be tested can be quickly determined based on the standard diagram, thereby improving the accuracy of locating the faulty object to be tested and the monitoring efficiency.

[0042] Since infrared thermal imaging technology was first introduced to power equipment defect diagnosis in Sweden in the 1950s and 1960s, it has played a significant role. Due to its advantages such as no power outage, no contact with the equipment being tested, and high detection efficiency, it has become one of the most important methods for non-destructive defect diagnosis of equipment in the power, petrochemical and other industries.

[0043] Since the temperature of high-voltage switchgear in substations will suddenly rise when insulation fault occurs, the infrared imaging state detection technology can effectively detect and diagnose insulation defects of high-voltage switchgear. The industrial application of infrared thermal imagers abroad began in the mid-1960s, and the effect was very significant in fault diagnosis of electrical equipment; my country's power sector has been conducting related theoretical discussions and research since the late 1980s. In the power system, infrared radiation energy detected by infrared thermal imagers can reflect the temperature or thermal state changes of related parts, and then discover the signs of defects in many electrical equipment and thermal power equipment.

[0044] At present, power companies are actively promoting condition maintenance work, and the thermal image processing technology of infrared thermal imagers is also constantly improving. Since infrared thermal image detection has not yet solved the problems of remote continuous monitoring, unified monitoring, data accumulation and manual operation, it has not been able to fully play its role. In recent years, the technology of integrating infrared temperature measurement with substation image monitoring system has emerged, which adds the function of remote infrared temperature measurement on the basis of substation image monitoring; however, due to the different fields of view of infrared and visible light, its use effect is affected.

[0045] At present, power equipment may experience local or multiple local high temperatures during use. The reasons for the high temperature include loose screws causing unstable connections, external rain causing equipment rust, etc. When power equipment overheats, as the temperature continues to rise, it will cause power equipment failure and even paralysis of the entire power grid.

[0046] To this end, power inspectors will use existing overheating fault detection equipment for inspection. However, during the inspection process, power inspectors can only see the temperature status diagram of the detected part of the power equipment through the overheating fault detection equipment. Because the thermal imaging display in the overheating fault detection equipment only distinguishes the temperature by color, it cannot display the specific heating location. When the power inspectors find that the temperature of a certain part of the equipment is too high during the inspection and need to repair it in time, they cannot quickly and accurately find the specific heating location. They can only judge the heating location based on their own experience, and then judge the cause of the heating and perform repairs. The work efficiency is low, and if the repair is not timely, it may even cause safety problems.

[0047] At present, infrared thermal imaging inspections of power grid equipment mainly adopt the traditional manual offline inspection method. Equipment inspectors use handheld infrared thermal imagers to detect the operating temperature of equipment on site, and then manually record the inspection data, such as equipment name, equipment location, equipment number, inspection results, etc. After the inspection, they return to the office and export the infrared inspection data recorded in the infrared thermal imager to the computer and manually enter it into the designated production management system software. This is time-consuming and labor-intensive, with low work efficiency, and is prone to problems such as data entry errors caused by staff negligence.

[0048] The present application aims to provide a method for detecting faults in power equipment based on thermal imaging technology. Compared with the prior art, the present application greatly improves the detection accuracy of thermal imaging, thereby being able to more accurately locate the faulty object under test, improving the application scenarios of thermal imaging technology, and greatly improving the efficiency of power equipment detection.

[0049] There are many devices and components contained in the power equipment. During normal use, the above devices and components will emit heat. More importantly, the various components on the electrical equipment are arranged relatively closely, which causes many inconveniences and interferences to the fault judgment through thermal imaging.

[0050] More importantly, the generated thermal image is easily affected by the surrounding environment. If the ambient temperature is high, the corresponding resistance will increase. After the resistance increases, the temperature of the device or component will naturally rise, and the corresponding threshold for detecting whether the temperature is normal or not also needs to change accordingly.

[0051] In some embodiments of the power equipment fault detection and analysis method provided in the present application, before adjusting the parameters to the same situation as when obtaining the standard image, taking the thermal imaging state images of the current multiple objects to be tested also includes:

[0052] When it is determined that a failure occurs in the object to be tested and the temperature of the object to be tested is the highest, the temperatures of other objects to be tested are checked based on the temperature of the object to be tested.

[0053] In order to make a separate and effective determination of the temperature of the object to be tested in the substation, that is, to find the actual temperature of a single object to be tested that is not affected by the surrounding environment. The value of the corresponding temperature of the object to be tested is a basis for judgment in this application. If the temperature of an object to be tested is abnormal, it will inevitably affect the surrounding objects to be tested, that is, it will cause the temperature of the surrounding objects to be tested to rise or fall.

[0054] If the temperature of one object to be tested is abnormal, it is necessary to calibrate the temperature of other objects to be tested. Since heat is emitted radially outward, in order to more accurately determine the temperature value of the object to be tested itself, an embodiment is that if an object to be tested fails and causes temperature abnormality, it is necessary to set a range with the failed object to be tested as the center and a certain radius as the circle, that is, other objects to be tested within this range will be affected, and the closer to the failed object to be tested, the larger the amplitude that needs to be calibrated, and the farther away, the smaller the amplitude that needs to be calibrated, that is, the farther away, the less affected by temperature.

[0055] In some embodiments of the power equipment fault detection and analysis method provided in the present application, based on the temperature of the object to be tested, checking the temperature of other objects to be tested includes:

[0056] Taking the faulty object to be tested as the center of the circle, the temperature attenuation rate is determined according to the current ambient temperature to determine the temperature attenuation values ​​corresponding to different distances.

[0057] Pick up the temperature values ​​of other objects to be measured in the state diagram, and subtract the attenuation value from the temperature value to obtain the actual temperature situation.

[0058] For detailed explanation, taking temperature rise as an example, if a UUT fails and the failure causes a high temperature, a range circle is set with the UUT as the center, that is, the temperatures of other UUTs in the range circle will be affected, but the farther the UUT is, the less affected it will be.

[0059] In order to fit the real effect, the influence of temperature along the radial direction is attenuated with the center of the circle of the fault object under test.

[0060] It should be pointed out that if the ambient temperature is low, the temperature decays faster, and if the ambient temperature is high, the temperature decays slower. Therefore, a different attenuation curve needs to be set according to the temperature in the current environment. There are different temperature attenuation values ​​for different distances on the attenuation curve. The host computer determines the temperature attenuation value based on the distance between the objects to be tested and the attenuation curve, and then subtracts the attenuation value from the temperature value detected in the state diagram to obtain the temperature of the object to be tested.

[0061] In some embodiments of the power equipment fault detection and analysis method provided in the present application, obtaining a standard image of thermal imaging when each object to be tested is in a normal state includes:

[0062] In the standard diagram, the temperature standard value of each object to be measured is picked up and recorded according to the outline of each object to be measured, and the standard value is used to compare with the temperature value in the state diagram.

[0063] The existing fault threshold is set according to the current environmental conditions, that is, when the temperature of the object under test exceeds the threshold, it proves that it has a fault. In the actual application of the traditional method, the maintenance personnel use the equipment to take thermal images, and can set a selection box on the instrument in advance, or use the host computer to pick up the outline of the thermal image to calibrate the corresponding objects under test in the power equipment one by one. When the temperature of some objects under test is too high, it can be preliminarily determined that the object under test has a fault.

[0064] Although the above method is direct, it cannot determine the deviation of the temperature of the object to be tested from the normal state, that is, it cannot determine the degree of temperature change caused by the fault, which to a certain extent affects the troubleshooting efficiency of maintenance personnel.

[0065] In order to solve the above problems, the present application generates a standard temperature diagram based on the current substation equipment. Each object to be tested in the standard temperature diagram is in a normal state, and in actual comparison, it is necessary to ensure that the temperature and parameters of the power equipment are in the same state as when the standard diagram is obtained.

[0066] After determining the standard diagram, it is necessary to use the host computer to determine the temperature value of each object under test in the current environment through the standard diagram. The standard value calibrated in the marking diagram is used to determine whether the object under test is in a normal state.

[0067] In some embodiments of the power equipment fault detection and analysis method provided in the present application, comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram includes:

[0068] Subtract the temperature value corresponding to the state diagram from the standard value, and judge the temperature rise and fall of each object to be tested based on the result of the subtraction.

[0069] During actual measurement, maintenance personnel will measure the power equipment on site to obtain a state diagram. By picking up the contours in the state diagram and extracting the temperature through the host computer, the temperature conditions of each object to be measured can be obtained under the same environment.

[0070] Since the external temperature environment is the same, the state diagram of the same object under test and the standard diagram are subtracted to obtain the temperature change degree of the object under test. The temperature of most of the objects under test may differ slightly, and the temperature values ​​in the state diagrams of some objects under test are greater than those in the standard diagrams, and the temperature values ​​in the state diagrams of some objects under test are less than those in the standard diagrams.

[0071] In order to facilitate the analysis, when the difference between the two images is positive, it is set to one color, and when the difference is negative, it is set to another color. In addition, different values ​​of the same color will result in different shades. By calibrating the temperature difference using the above method, the temperature change of the object to be tested can be intuitively displayed to the maintenance personnel.

[0072] In some embodiments of the power equipment fault detection and analysis method provided in the present application, judging the rise and fall of the temperature of each object to be tested according to the result of the difference includes:

[0073] Set the judgment value to determine whether the object under test is normal or not. If the absolute value of the difference between the temperature value corresponding to the state diagram and the temperature value in the standard diagram is greater than the judgment value, the object under test has a fault.

[0074] In the existing technology, maintenance personnel use thermal imaging cameras to obtain the thermal forming status diagram of the current power equipment, and then determine whether a fault occurs based on the temperature of each device or component on the status diagram. However, the above analysis method has certain limitations, that is, the temperature of a component may not increase significantly after a component fails, or due to the influence of the ambient temperature, the temperature of the relevant component is high, but it is still in a normal state at this time.

[0075] In order to accurately determine whether the object to be tested is normal or not, multiple reference rules are set in this application. First, if the object to be tested is short-circuited or the object to be tested loses its function due to a fault, energy cannot be input. At this time, the object to be tested at the corresponding position in the standard diagram has a temperature value, and the temperature value of the object to be tested in the state diagram is relatively low, or even the same as the ambient temperature. At this time, it can be determined that the object to be tested is in a fault state.

[0076] In order to conduct a more intuitive analysis, different judgment values ​​can be set for different objects to be tested. If the absolute value of the temperature value corresponding to the state diagram and the standard diagram after the difference is greater than the judgment value, then the power equipment is judged to be in a fault state. If the absolute value of the temperature value corresponding to the state diagram and the standard diagram after the difference is less than the judgment value, further observation is required.

[0077] In some embodiments of the power equipment fault detection and analysis method provided in the present application, before comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram, the method further includes:

[0078] The power equipment is divided into various areas, and the operating conditions of each object under test in the area are determined based on the area.

[0079] Since the states of various UUTs are different when they fail, the surface temperature of some UUTs will not change significantly even if they fail, but other UUTs may be affected, that is, the temperature of other UUTs will change to a certain extent due to abnormalities in access data and other reasons.

[0080] Most of the existing technologies analyze the entire power equipment. If part of the DUT fails but the temperature does not change much, then other DUTs with failures need to be analyzed, and maintenance personnel are required to measure the DUTs one by one, resulting in low troubleshooting efficiency and requiring a lot of manpower and material resources.

[0081] In order to solve the above problems, the present application first divides the power equipment into regions, and usually sets the directly related ones in one region. If all the temperature conditions in a region are within the normal range, it indicates that all the objects to be tested in the region are in the proposed normal state. If the temperature of a certain object to be tested in the region is abnormal, then the object to be tested may have a fault. In order to conduct a detailed investigation, it is necessary to check the objects to be tested in the entire region.

[0082] In some embodiments of the power equipment fault detection and analysis method provided in the present application, the power equipment is divided into various areas, and the operating status of each object under test in the area is determined in units of areas, including:

[0083] Based on the data flow and the transmission relationship of electric energy, the power equipment is divided into different areas.

[0084] When a certain DUT in the area fails and has an abnormal temperature, the DUT and the DUT located at the front end of the DUT connection relationship are detected.

[0085] The areas in this application are not divided according to the installation location, but are divided according to the flow of data and the transmission of electric energy, so the outer contour of the divided area is not a regular shape. More importantly, in the prior art, each object to be tested is tested separately by a thermal imager, without considering the transmission relationship between the objects to be tested, and without considering that the objects to be tested may affect each other, which may cause the temperature of the normal object to be tested to be high, while the temperature of the faulty object to be tested does not change significantly.

[0086] In order to solve the above problem, multiple regions are first divided according to the transmission relationship of data or electric energy, and after obtaining the state diagram, the state diagram is divided according to the relative position relationship of the multiple regions. After the division is completed, the temperature values ​​corresponding to the multiple objects to be tested in the region are analyzed respectively.

[0087] If the temperature performance of all the objects to be tested in an area meets the requirements, then there is no need for subsequent testing for the time being. If some temperature values ​​in an area are abnormal, then according to the connection relationship, the area itself and the objects to be tested in front of it are tested separately. Through the above settings, the speed of analysis is greatly improved.

[0088] In some embodiments of the power equipment fault detection and analysis method provided in the present application, after detecting the device under test and the device under test located at the front end of the connection relationship between the device under test, the method further includes:

[0089] A database is established, and corresponding troubleshooting methods are retrieved from the database according to the temperature changes of each object to be tested in the same area.

[0090] In this application, because the state diagram and the standard diagram are determined, the change of the object to be tested can be obtained by subtracting the corresponding temperature values ​​in the two diagrams. If a specific object to be tested in an area fails, other objects to be tested in the area will also be affected. Therefore, by summarizing and analyzing the change relationship of the temperature of each object to be tested in the area, it is possible to quickly determine which object to be tested has failed, and the setting can determine what failure the object to be tested has.

[0091] To this end, a database can be established first, which stores the temperature changes of other objects under test in the entire area corresponding to the failure of each object under test in different areas. After subtracting the state diagram from the standard diagram, if the temperature change of some objects under test exceeds the specified standard, all temperature changes in the area are compared with the data to analyze the specific location of the failure.

[0092] In some embodiments of the power equipment fault detection and analysis method provided in the present application, retrieving the corresponding fault solution in the database includes:

[0093] The temperature conditions of each object under test in the same area are used as keywords. Based on the keywords, the scope is appropriately expanded to retrieve the corresponding faults of the object under test and their solutions from the database.

[0094] Based on previous troubleshooting records and other content, cases in different areas of power equipment are generated. Each case includes the temperature change values ​​of other DUTs corresponding to different faults of the DUT. In actual application, the temperature change of all DUTs in a region is set as a keyword. Since the corresponding temperature values ​​will also vary to a certain extent in different environments, a certain range can be changed based on each DUT. That is, the cases in the database that fall into this range can be used as a method to solve the fault, and then the DUTs at the corresponding positions are repaired according to the records in the case.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting and analyzing faults in electric power equipment, characterized in that: include: According to the type of power equipment, obtain a standard thermal imaging image when each object under test is in a normal state; When the electric power equipment is actually running, the parameters are adjusted to the same conditions as when the standard image is obtained, and the current thermal imaging state images of the plurality of objects to be tested are photographed; Compare the temperature value corresponding to the state diagram with the temperature value in the standard diagram to determine whether each of the objects under test has a fault; In the case where the parameters are adjusted to be the same as when the standard image is obtained, before taking the current thermal imaging state images of the plurality of objects to be tested, the method further includes: When it is determined that the object to be tested has a fault and the temperature of the object to be tested is the highest, based on the temperature of the object to be tested, the temperatures of the other objects to be tested are checked; The checking of the temperature of the other objects to be measured based on the temperature of the object to be measured comprises: Taking the faulty object to be tested as the center of the circle, according to the current ambient temperature, the temperature attenuation rate is determined to determine the temperature attenuation values ​​corresponding to different distances; Pick up the temperature value of the other objects to be measured in the state diagram, and subtract the attenuation value from the temperature value to obtain the actual temperature condition.

2. The method for detecting and analyzing faults in electric power equipment according to claim 1, characterized in that: The standard image of thermal imaging obtained when each object to be tested is in a normal state includes: In the standard diagram, the temperature standard value of each of the objects to be measured is picked up and recorded according to the contour of each of the objects to be measured, and the standard value is used for comparison with the temperature value in the state diagram.

3. The method for detecting and analyzing faults in electric power equipment according to claim 2, characterized in that: The comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram comprises: The temperature value corresponding to the state diagram is subtracted from the standard value, and the rise and fall of the temperature of each of the objects to be measured is determined according to the result of the subtraction.

4. The method for detecting and analyzing faults in electric power equipment according to claim 3, characterized in that: The step of judging the temperature rise and fall of each of the objects to be tested according to the result of the difference comprises: A judgment value is set to judge whether the object to be tested is normal or not. If the absolute value of the difference between the temperature value corresponding to the state diagram and the temperature value in the standard diagram is greater than the judgment value, the object to be tested has a fault.

5. The method for detecting and analyzing faults in electric power equipment according to claim 4, characterized in that: Before comparing the temperature value corresponding to the state diagram with the temperature value in the standard diagram, the method further includes: The electric power equipment is divided into various areas, and the operating conditions of each of the objects to be tested in the area are determined based on the area.

6. The method for detecting and analyzing faults in electric power equipment according to claim 5, characterized in that: The dividing the electric power equipment into various areas and judging the operation status of each of the objects to be tested in the area by the area includes: According to the data flow and the transmission relationship of electric energy, the electric equipment is divided into the various areas; When a certain object under test in the area fails and has an abnormal temperature, the object under test and the object under test located at the front end of the connection relationship with the object under test are detected.

7. The method for detecting and analyzing faults in electric power equipment according to claim 6, characterized in that: After detecting the object to be tested and the object to be tested located at the front end of the connection relationship between the object to be tested, the method further includes: A database is established, and corresponding fault solutions are retrieved from the database according to the temperature changes of the objects to be tested located in the same area.

8. The method for detecting and analyzing faults in electric power equipment according to claim 7, characterized in that: Retrieving the corresponding fault solution from the database includes: The temperature conditions of the objects to be tested in the same area are used as keywords, and the scope is appropriately expanded based on the keywords to retrieve the corresponding faults of the objects to be tested and the solutions from the database.

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