Device and method for judging overheating of equipment based on mixed gas decomposition product

Abstract

The invention discloses a device and method for judging overheating of equipment based on a mixed gas decomposition product, and relates to the technical field of electric power system control, and the device comprises a mixed gas detection module which is used for decomposing the mixed gas of to-be-detected equipment to obtain the type and content of the decomposition product; the environment temperature detection module is used for detecting the environment temperature of the to-be-detected equipment to obtain environment temperature information; the control module is used for judging the to-be-detected equipment according to the type and content of the decomposition product and the environment temperature information and outputting a judgment result; the storage module is used for storing the type and content of the decomposition product, the environment temperature information and the judgment result; the printing module is used for printing and outputting the judgment result; the display module is used for displaying the judgment result; and a power module. According to the invention, the type, the content and the heating temperature of decomposition products after local overheating of the mixed gas device can be detected to determine the fault type, and the power supply reliability of equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment detection, and in particular to a device and method for judging equipment overheating based on mixed gas decomposition products. Background Art

[0002] SF6 gas has been widely used in gas insulation of electronic and electrical equipment due to its excellent insulation and arc extinguishing properties. However, SF6 has poor environmental protection performance and serious greenhouse effect. It can exist in the atmosphere for up to 3,200 years. Therefore, the problem that needs to be solved is to reduce the amount of SF6 gas used in power equipment to reduce its greenhouse effect.

[0003] In recent years, the use of SF6 mixed gas as an insulating gas inside equipment to reduce the amount of SF6 has been promoted and recognized at home and abroad. Studies have found that when SF6 and N2 are mixed in a certain proportion, their insulation strength will show a strong synergistic effect. The use of a low volume fraction of SF6 / N2 mixed gas has good insulation performance and a certain opening and closing ability. N2 has stable chemical properties, low prices, and a lower liquefaction temperature than SF6. When the two are mixed, they not only reduce the emission of SF6 gas, but also reduce the overall liquefaction temperature. Establishing the correlation between different local overheating faults and the decomposition products of SF6 / N2 mixed gas, by detecting the gas components, content and change rules inside SF6 / N2 mixed gas electrical equipment, the type of internal equipment faults, fault development trends and degree of danger can be analyzed and diagnosed, which is of great significance for ensuring the safe and stable operation of the power grid.

[0004] At present, there are many detection methods for SF6 gas and its decomposition components at home and abroad, and relevant standards have been established. The following are commonly used gas product analysis methods.

[0005] (1) Chemical test tube method

[0006] The chemical detection tube method uses the principle of chemical reaction. Chemical agents are placed in the detection tube to change the color, and the concentration of the gas is measured according to the different colors and corresponding scales. This method does not require too high detection costs, and the method of use is simple and intuitive.

[0007] (2) Infrared spectroscopy (IR)

[0008] Infrared spectroscopy is a method of analyzing decomposition products by using the different degrees of infrared light absorption by gases. It conducts qualitative and quantitative analysis based on the content of infrared light absorbed by the detected components. This method has the advantages of fast detection speed, no destruction of the structure of the substance, detection of multiple components, and can achieve online monitoring.

[0009] Among the above methods, the chemical detection method will not cause color changes for neutral decomposition components and alkaline decomposition components, and is greatly affected by environmental factors such as moisture and temperature, has great limitations, and the detection product is single; the infrared spectroscopy method has cross-interference with the infrared light absorption peaks of some gases.

[0010] Therefore, there is an urgent need for a method for detecting and analyzing the decomposition products of the mixed gas to determine the fault state of the equipment. Summary of the invention

[0011] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art, and to design a device and method for judging equipment overheating based on the decomposition products of mixed gases. By collecting and detecting SF6 and its decomposition products, the fault condition of the power equipment can be judged.

[0012] The technical solution adopted by the present invention to solve its technical problem is:

[0013] In a first aspect, the present invention provides a device for judging overheating of equipment based on decomposition products of mixed gas, comprising:

[0014] A mixed gas detection module, used to decompose the mixed gas of the device to be detected to obtain the type and content of the decomposition product;

[0015] An ambient temperature detection module is used to detect the ambient temperature of the device to be detected and obtain ambient temperature information;

[0016] A control module, which judges the device to be detected according to the type and content of the decomposition product and the ambient temperature information and outputs the judgment result;

[0017] A storage module, used to store the type and content of decomposition products, ambient temperature information and judgment results;

[0018] A printing module, used for printing out the judgment results;

[0019] A display module, used for displaying the judgment result;

[0020] A power module is used to provide working voltage to the control module and the display module;

[0021] The mixed gas detection module is connected to the device to be detected through a gas pipeline, the output ends of the mixed gas detection module and the ambient temperature detection module are connected to the control module, the output end of the control module is connected to the printing module and the display module, the control module is also connected to the storage module, and the output end of the power module is connected to the control module and the display module.

[0022] As a further technical solution of the present invention, the mixed gas detection module is a SF6 helium ion comprehensive detector for detecting the type and content of decomposition products from mixed gas equipment.

[0023] As a further technical solution of the present invention, the power module includes a charger and a lithium battery; the charger is connected to an external power supply, the output end of the charger is connected to the lithium battery, and the output end of the lithium battery is connected to the control module.

[0024] As a further technical solution of the present invention, the control module is further connected to a database module, and the database is used to store the types and contents of decomposition products of different mixed gases at different temperatures.

[0025] As a further technical solution of the present invention, the judgment result includes:

[0026] The type of equipment failure is determined based on the type and content of the decomposition products, including: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

[0027] As a further technical solution of the present invention, the display module is a liquid crystal display screen.

[0028] In a second aspect, the present invention also provides a method for determining an overheating device of an equipment based on decomposition products of a mixed gas, comprising the following steps:

[0029] Connect the equipment to be tested to the mixed gas detection module through the gas pipeline;

[0030] The mixed gas detection module detects the mixed gas of the equipment to be detected to obtain the type and content of decomposition products;

[0031] The control module receives the type and content of the decomposition products and performs comparative analysis on them to output a judgment result;

[0032] The judgment results are displayed and printed through the display module and the printing module.

[0033] As a further technical solution of the present invention, the control module receives the type and content of the decomposition product and performs comparative analysis on them and outputs a judgment result, specifically including:

[0034] The control module analyzes the type and content of the decomposition products to determine whether the decomposition products are produced by overheating;

[0035] If the decomposition product type is generated by overheating, the overheating temperature and fault type are determined by comparison with the database;

[0036] If the decomposition product type is not produced by overheating, it indicates that the equipment to be tested is normal.

[0037] As a further technical solution of the present invention, the fault types include: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention uses a mixed gas detection module to decompose and detect the mixed gas generated by the device to be detected, and obtains the type and content of the mixed gas decomposition products of the device to be detected; obtains the ambient temperature information around the device to be detected through the ambient temperature detection module, and determines the fault type by comparing the type and content of the mixed gas decomposition products and the ambient temperature information with the gas type in the database, thereby judging whether the device to be detected has a fault and the type of fault, and can quickly and accurately judge the fault type, realize overheating fault warning of the device to be detected, and timely maintain the device to be detected to prevent accidents and improve production efficiency. The present invention can detect the type and content of the decomposition products and the heating temperature of the device containing mixed gases in different proportions after local overheating, solves the problem that the local heating temperature of the mixed gas cannot be detected, and improves the power supply reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a control structure diagram of a device for judging overheating of equipment based on decomposition products of mixed gas proposed by the present invention;

[0041] Figure 2 This is a flow chart of a method for judging an overheating device of an equipment based on decomposition products of mixed gas proposed by the present invention.

[0042] Figure 3 This is a flow chart of a specific implementation method of the present invention. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0044] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0047] The present invention uses gas chromatography (GC) to separate mixed gases well. Mixed gases with different physical and chemical properties are sent to detectors separately after passing through a chromatographic column, so as to achieve the purpose of separate detection. The method is simple to operate, has high sensitivity, and can quickly achieve accurate detection and efficient separation.

[0048] Embodiment 1

[0049] like Figure 1 As shown, the present invention provides a device for judging overheating of equipment based on decomposition products of mixed gas, comprising:

[0050] The mixed gas detection module 101 is used to decompose the mixed gas of the device to be detected to obtain the type and content of the decomposition product;

[0051] The ambient temperature detection module 102 is used to detect the ambient temperature of the device to be detected and obtain ambient temperature information;

[0052] The control module 103 judges the device to be detected according to the type and content of the decomposition product and the ambient temperature information and outputs the judgment result;

[0053] The storage module 104 is used to store the type and content of the decomposition product, the ambient temperature information and the judgment result;

[0054] The printing module 105 is used to print out the judgment result;

[0055] Display module 106, used to display the judgment result;

[0056] The power module 107 is used to provide working voltage to the control module and the display module;

[0057] The mixed gas detection module is connected to the device to be detected through a gas pipeline, the output ends of the mixed gas detection module and the ambient temperature detection module are connected to the control module, the output end of the control module is connected to the printing module and the display module, the control module is also connected to the storage module, and the output end of the power module is connected to the control module and the display module.

[0058] In the embodiment of the present invention, the SF6 helium ion comprehensive detector is connected to the control module, the ambient temperature detection module uses a temperature sensor to measure the temperature of the test environment, is located next to the device, and is electrically connected to the control module; the storage module is used to save verification information, can be connected to an external storage device, and is electrically connected to a data processing chip; the printing module is used to print the verification results, and is electrically connected to the control module; the control module is used to complete the processing of relevant data such as ambient temperature, decomposition product type and content, send display data to the LCD screen, and is directly powered by a lithium battery, and is electrically connected to the LCD screen, the temperature sensor, the storage module, the data printing module, and the lithium battery; the display module uses a liquid crystal screen to display the decomposition products and the data processing chip data comparison processing results, and is electrically connected to the control module.

[0059] The display module in the embodiment of the present invention may be a touch screen, a liquid crystal display or other display device, whichever is capable of displaying the detection result, and the present invention does not limit this.

[0060] The present invention can detect the type and content of decomposition products and heating temperature after local overheating of a device containing mixed gases in different proportions, solves the problem that the local heating temperature of the mixed gas cannot be detected, and improves the power supply reliability of the equipment.

[0061] The present invention uses a mixed gas detection module to decompose and detect the mixed gas generated by the equipment to be detected, and obtains the type and content of the mixed gas decomposition products of the equipment to be detected; obtains the ambient temperature information around the equipment to be detected through the ambient temperature detection module, and determines the fault type by comparing the type and content of the mixed gas decomposition products and the ambient temperature information with the gas type in the database, thereby judging whether the equipment to be detected has a fault and the fault type, and can quickly and accurately judge the fault type, realize overheating fault warning of the equipment to be detected, timely maintain the equipment to be detected, prevent accidents, and improve production efficiency.

[0062] The present invention aims at the problem of complex decomposition products of SF6 mixed gas after partial discharge. According to the type and content of the decomposition products, it can be judged whether the equipment has a fault and the type of fault. The mixed gas detection module uses gas chromatography to detect the type and content of the decomposed gas, and judges the heating condition of the equipment through different decomposition products. The mixed gas detection module is a SF6 helium ion comprehensive detector, which can be used to detect the type and content of decomposition products from mixed gas equipment.

[0063] In the embodiment of the present invention, the power module includes a charger and a lithium battery; the charger is connected to an external power supply, the output end of the charger is connected to the lithium battery, and the output end of the lithium battery is connected to the control module. The charger and the lithium battery are used as power supplies, which can be easily carried and do not require additional power cables, making them easy to use. Among them, the charger is used for indirect power supply and is electrically connected to the lithium battery; the lithium battery is used for direct power supply and is electrically connected to the charger, the control module, and the SF6 helium ion comprehensive detector;

[0064] The control module is also connected to a database module, which is used to store the types and contents of decomposition products of different mixed gases at different temperatures. The database module includes the decomposition gas type, content and fault type at the corresponding temperature. By comparing the decomposition gas type and content, and the heating temperature of the equipment, the fault type is determined by comparing the database information.

[0065] Among them, the judgment results include: judging the type of equipment failure based on the type and content of decomposition products, among which the types of equipment failure include: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

[0066] In the embodiment of the present invention, experiments are carried out in the range of 240°C to 360°C. The types of products of insulating materials involved in local overheating of SF6 include SO2, SOF2, SO2F2, COS, H2S, CF4, H2, CO and CO2. Among them, H2 and CF4 are unique gases under overheating of insulating materials, which are different from metallic overheating. From the perspective of product types, the two fault types can be effectively identified.

[0067] Fill the tank with 0.4MPa SF6 gas, control the initial water content in the gas chamber to be consistent, adjust the local heat source temperature to 240℃, 280℃, 320℃, and 360℃ to carry out experiments. Each group of experiments lasts for 10 hours, and samples are taken every 1h. The experimental results show that after the temperature is maintained at 240℃ for 10h, carbon-containing products CO2 and CO appear, and the concentrations of the two products are significantly higher than those measured in the pure metal overheating experiment, indicating that at this temperature, the epoxy resin has begun to decompose in small quantities to provide part of the C source. In addition, a new decomposition byproduct H2 is detected, and only SO2 and SOF2 appear as sulfur-containing products, indicating that the stable state of SF6 gas at this temperature point has been destroyed, but due to the low fault temperature, the content of these two products is not very high. When the temperature rises to 280℃, the production of CO2, CO, and H2 increases with temperature, the molar concentration CO2>CO>H2, and the molar concentration of the sulfide product satisfies SO2>SOF2. When the temperature continued to rise to 320℃, multiple new products, SO2F2, H2S, COS and CF4, were added, indicating that the generation temperature of the above four products was between 280℃ and 320℃, and the concentration relationship between the components was SO2F2>H2S>COS>CF4. When the temperature was further raised to 360℃, the gas production detected increased further, but the types of decomposition products no longer changed.

[0068] The curves of the molar concentrations of CO2 and CO changing with temperature and time show that: the epoxy resin has begun to decompose slowly at 240°C, and the molar concentration of CO2 increases in a J-shaped trend with heating time and temperature. The increase from 320°C to 360°C is significantly higher than that from 320°C to 280°C. The higher the temperature, the more significant the promotion of CO2 generation. The total gas production at the four temperature points is 120.32ul / l, 259.35ul / l, 420.14ul / l, and 652.35ul / l, respectively.

[0069] The concentration of CO increases less with time and temperature than CO2. The total gas production at the four temperature points is 80.381ul / l, 180.34ul / l, 309.01ul / l, and 421.07ul / l, respectively. However, they are all much higher than the content under pure metallic overheating, because the carbon source in CO and CO2 is mainly provided by the C element released by heat in stainless steel or epoxy resin materials, and they will react when encountering oxygen molecules adsorbed on the surface of the material and O atoms dissociated from water molecules. In addition, in addition to a large number of CC and CO bonds, the molecular structure of epoxy resin also contains a large number of CHx groups, which can also be continuously converted into CO and CO2, making the molar concentration of both under epoxy resin overheating significantly higher than that of pure metallic overheating. When CO encounters the highly active molecule OH, it will combine with it to form COOH, and COOH will continue to decompose into CO2 and H atoms, consuming part of CO, making the growth trend of CO not as dramatic as that of CO2.

[0070] Table 1

[0071]

[0072] Refer to Table 1. When the mixed gas detection module detects SOF2 gas, it can be judged as arc discharge. 10 , it can be judged as spark discharge. When the decomposition gas contains HF and H2S, it is judged as local discharge. When the decomposition gas contains CS2, it is judged as surface discharge under the insulating material. When the decomposition gas contains CO, CO2, and H2S, it is judged as pure metal overheating. When the decomposition gas contains H2 and CF4, it involves local overheating of the epoxy resin.

[0073] Embodiment 2

[0074] See also Figure 2 and Figure 3 This embodiment provides a method for determining an overheating device of a device based on the decomposition products of a mixed gas, comprising the following steps:

[0075] Step 201, connecting the device to be detected to the mixed gas detection module through a gas pipeline;

[0076] Step 202: The mixed gas detection module detects the mixed gas of the device to be detected to obtain the type and content of the decomposition product;

[0077] Step 203, the control module receives the type and content of the decomposition product and performs comparative analysis on them and outputs a judgment result;

[0078] Step 204: display and print the judgment result through the display module and the printing module.

[0079] In step 203, the control module receives the type and content of the decomposition products and performs comparative analysis on them to output a judgment result, which specifically includes:

[0080] The control module analyzes the type and content of the decomposition products to determine whether the decomposition products are produced by overheating;

[0081] If the decomposition product type is generated by overheating, the overheating temperature and fault type are determined by comparison with the database;

[0082] If the decomposition product type is not produced by overheating, it indicates that the equipment to be tested is normal.

[0083] Among them, the fault types include: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

[0084] The various variations and specific examples of the device in the aforementioned embodiment are also applicable to the method for determining an overheating device based on the decomposition products of a mixed gas in the present embodiment. Through the aforementioned detailed description of the device for determining an overheating device based on the decomposition products of a mixed gas, those skilled in the art can clearly understand the method for determining an overheating device based on the decomposition products of a mixed gas in the present embodiment. Therefore, for the sake of brevity of the specification, it will not be described in detail here.

[0085] Embodiment 3

[0086] Take the mixed gas SF6 / N2 as an example.

[0087] First, the data processing chip of the device is fed with the database of the types and contents of decomposition products of SF6 / N2 mixed gas at different mixing ratios at different temperatures. For example, if the decomposition component C2F6 is detected, it means that the local overheating fault temperature is 200°C or below; if the decomposition components SO2 and SO2F2 are detected, it means that the local overheating fault temperature reaches 300°C; if the decomposition components CS2 and COS are detected, it means that the local overheating fault temperature reaches 400°C or above; if the decomposition component NF3 is detected, it means that the local overheating fault temperature is at least above 500°C.

[0088] Secondly, the device connects the device under test and the SF6 helium ion comprehensive detector through the connecting gas line, and measures the ambient temperature of the device at the same time, and inputs the ambient temperature and the mixing ratio of SF6 / N2 mixed gas into the test device. The device uses the data processing chip to comprehensively compare the type and content of gas decomposition products in the SF6 helium ion comprehensive detector, ambient temperature and other factors, and compares and converts them with the relevant data in the database.

[0089] Finally, the type and content of gas decomposition products, local overheating fault temperature and other information are displayed on the display screen.

[0090] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0091] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0092] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0093] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for judging equipment overheating based on the decomposition products of mixed gas, characterized in that: include: A mixed gas detection module, used to decompose the mixed gas of the device to be detected to obtain the type and content of the decomposition product; An ambient temperature detection module is used to detect the ambient temperature of the device to be detected and obtain ambient temperature information; A control module, which judges the device to be detected according to the type and content of the decomposition product and the ambient temperature information and outputs the judgment result; A storage module, used to store the type and content of decomposition products, ambient temperature information and judgment results; A printing module, used for printing out the judgment results; A display module, used for displaying the judgment result; A power module is used to provide working voltage to the control module and the display module; The mixed gas detection module is connected to the device to be detected through a gas pipeline, the output ends of the mixed gas detection module and the ambient temperature detection module are connected to the control module, the output end of the control module is connected to the printing module and the display module, the control module is also connected to the storage module, and the output end of the power module is connected to the control module and the display module.

2. The device for judging equipment overheating based on mixed gas decomposition products according to claim 1, characterized in that: The mixed gas detection module is a SF6 helium ion comprehensive detector, which is used to detect the type and content of decomposition products from mixed gas equipment.

3. The device for judging equipment overheating based on mixed gas decomposition products according to claim 1, characterized in that: The power module includes a charger and a lithium battery; the charger is connected to an external power supply, the output end of the charger is connected to the lithium battery, and the output end of the lithium battery is connected to the control module.

4. The device for judging equipment overheating based on mixed gas decomposition products according to claim 1, characterized in that: The control module is also connected to a database module, and the database is used to store the types and contents of decomposition products of different mixed gases at different temperatures.

5. The device for judging equipment overheating based on mixed gas decomposition products according to claim 1, characterized in that: The judgment results include: The type of equipment failure is determined based on the type and content of the decomposition products, including: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

6. The device for judging equipment overheating based on mixed gas decomposition products according to claim 1, characterized in that: The display module is a liquid crystal display screen.

7. A method for verifying an overheating device based on mixed gas decomposition products, using the device for determining overheating of a device based on mixed gas decomposition products as claimed in any one of claims 1 to 6, comprising the following steps: Connect the equipment to be tested to the mixed gas detection module through the gas pipeline; The mixed gas detection module detects the mixed gas of the equipment to be detected to obtain the type and content of decomposition products; The control module receives the type and content of the decomposition products and performs comparative analysis on them to output a judgment result; The judgment results are displayed and printed through the display module and the printing module.

8. The method for verifying an overheating device of a device based on decomposition products of mixed gas according to claim 7, characterized in that: The control module receives the type and content of the decomposition products and performs comparative analysis on them to output a judgment result, specifically including: The control module analyzes the type and content of the decomposition products to determine whether the decomposition products are produced by overheating; If the decomposition product type is generated by overheating, the overheating temperature and fault type are determined by comparison with the database; If the decomposition product type is not produced by overheating, it indicates that the equipment to be tested is normal.

9. The method for verifying an overheating device of a device based on decomposition products of mixed gas according to claim 7, characterized in that: The fault types include: arc discharge, spark discharge, local discharge, surface discharge under insulating materials, pure metallic overheating, and local overheating involving epoxy resin.

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