Device and method for testing compatibility of environment-friendly mixed insulating gas and material

Abstract

The invention discloses a device and a method for testing compatibility of environment-friendly mixed insulating gas and materials, which are characterized in that a detection device is cleaned by using absolute ethyl alcohol, and is washed by N2 gas for multiple times, and then the air tightness of the detection device is checked; the interior of the detection device is vacuumized, and then SF6 / N2 mixed gas of different materials and the materials are filled for a compatibility experiment. According to the device and method for testing the compatibility of the environment-friendly mixed insulating gas and the material, the power supply module is started, and real-time monitoring is performed through the discharge detection and monitoring module, so that partial discharge experiments are respectively performed through SF6 mixed gas with different proportions, and sample collection is performed every 12 hours; the method comprises the following steps: adding a to-be-tested material into an insulating gas, continuously analyzing byproducts by virtue of a gas chromatograph-mass spectrometer, observing the surface morphology of the material by virtue of a scanning electron microscope after a 96-hour discharge experiment is finished, and comparing the to-be-tested material with the material after the experiment to obtain an experiment result, so as to complete the compatibility of the material and the insulating gas.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection equipment, and in particular to a test device and method for the compatibility of environmentally friendly mixed insulating gas with materials. Background Art

[0002] SF6 (sulfur hexafluoride) is a colorless, odorless, non-flammable gas with extremely high electrical insulation and arc extinguishing properties. It is mainly used in high-voltage electrical insulation equipment. The insulation performance of SF6 gas is far superior to traditional insulating media such as air, and it can effectively prevent the generation of arcs under high-voltage environments. However, SF6 is a potent greenhouse gas with a global warming potential (GWP) that is more than 20,000 times that of carbon dioxide. In order to reduce the use of SF6 gas and reduce its impact on the environment, researchers and engineers have explored different alternatives. Since the 1970s, scholars from various countries have begun to study the use of SF6 mixed gas to replace SF6 in electrical equipment. SF6 mixed gas research mainly includes SF6 / air, SF6 / N2, SF6 / CO2 and some other inert gases.

[0003] Due to the chemical properties of SF6 gas, materials may be subject to certain chemical corrosion or other adverse effects in a high-pressure environment. Therefore, choosing the right materials and surface treatment is an important factor in ensuring the long-term stable operation of the equipment. However, in the prior art, there are blind spots in the research on the decomposition products of environmentally friendly mixed insulating gas and the sealing materials in the equipment, including: lack of experimental data on compatibility, incomplete decomposition characteristics data, and quantitative evaluation methods need to be improved. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems that the above-mentioned existing test devices and methods for the compatibility of environmentally friendly mixed insulating gas with materials have a lack of experimental data on compatibility, incomplete decomposition characteristic data, and a quantitative evaluation method that needs to be improved, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: using anhydrous ethanol to clean the detection device to remove dust and impurities, and flushing it with N2 gas for multiple times, and then checking the air tightness of the detection device; by evacuating the inside of the detection device, and then filling it with SF6 / N2 mixed gas of different materials and materials to perform compatibility tests, and observing the internal air pressure through an air pressure detection device, and then controlling the proportion of the internal gas through the mutual cooperation of multiple valves; and, starting the power supply module, and performing real-time monitoring through the discharge detection and monitoring module, so as to perform local discharge experiments respectively through SF6 mixed gas of different proportions, collect samples every 12 hours, and continue to analyze the by-products through gas chromatography-mass spectrometry. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the experimental results are obtained by comparing the material to be tested with the material after the experiment.

[0007] As a preferred scheme of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the vacuuming step is to connect the gas pipe to the vacuum pump, open the gas release valve, and evacuate the detection device into a vacuum state until the pressure gauge displays -0.1MPa, close the gas release valve and the vacuum pump, and let it stand for 1 hour. If there is no change in the pressure gauge after 1 hour, the air tightness of the detection device is good.

[0008] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the change of air pressure is observed by a barometer after vacuuming, and different SF6 / N2 mixing ratios are filled in the detection device according to the change of air pressure, and the compatibility of SF6 / N2 mixed gas with different gas mixing ratios and different materials with materials is tested.

[0009] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas and materials described in the present invention, wherein: the discharge experiment starts the high-voltage power supply module, increases the voltage and performs real-time monitoring through the discharge measurement and monitoring module, sets the starting voltage and the test voltage, and controls the voltage to slowly increase from the starting voltage to the required voltage value to perform a partial discharge experiment, and performs 96h of partial discharge experiments under different proportions of SF6 mixed insulating gas, collects decomposition gas samples every 12h, and passes the collected gas into a gas chromatography-mass spectrometer for qualitative and quantitative analysis of the generation characteristics of related gas by-products. After the 96h discharge experiment is completed, a scanning electron microscope is used to observe the surface morphology of the material, and the material to be tested is compared with the material after the experiment. If the material after the experiment only undergoes physical changes, the SF6 / N2 mixed gas is compatible.

[0010] As a preferred solution of the test device and method for the compatibility of environmentally friendly mixed insulating gas with materials described in the present invention, if breakdown occurs during the experiment and the voltage suddenly rises, the experimenter can manually cut off the power supply through the control panel to stop the experiment, or when the experimental voltage is too high, higher than the set maximum voltage value, the overvoltage protection device will automatically cut off the power supply to terminate the experiment.

[0011] The beneficial effects of the first implementation scheme of the present invention are as follows: by starting the power supply module and performing real-time monitoring through the discharge detection and monitoring module, local discharge experiments are carried out respectively through SF6 mixed gases in different proportions, samples are collected every 12 hours, and the by-products are continuously analyzed through gas chromatography-mass spectrometry. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the experimental results are obtained by comparing the material to be tested with the material after the experiment, thereby completing the compatibility of the material and the insulating gas.

[0012] In view of the above-mentioned lack of existing experimental data on compatibility, incomplete decomposition characteristic data, and the need to improve the quantitative evaluation method.

[0013] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0014] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, wherein: a detection module, the detection module includes a control component, an experimental component arranged on the control component, a valve component arranged on the experimental component, and a storage component arranged on the valve component.

[0015] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the control component includes a discharge detection system, a monitoring module arranged inside the discharge detection system, a controller arranged on the discharge detection system, a high-voltage power supply module arranged inside the discharge detection system, and a gas chromatography-mass spectrometer GC-MS arranged next to the discharge detection system.

[0016] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the experimental component includes a wire arranged on the high-voltage power supply module, a discharge chamber arranged on the wire, a pressure gauge arranged on the discharge chamber, and a support frame.

[0017] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the valve assembly includes an air inlet pipe arranged on the discharge chamber, a gas valve arranged on the air inlet pipe, a first branch pipe and a second branch pipe arranged on the air inlet pipe, and a gas-blocking valve arranged on the first branch pipe and the second branch pipe.

[0018] As a preferred solution of the test device and method for the compatibility of the environmentally friendly mixed insulating gas with materials described in the present invention, the storage assembly includes an SF6 gas cylinder arranged on the first branch pipe, and an N2 gas cylinder arranged on the second branch pipe.

[0019] The beneficial effects of the present invention are as follows: the high-voltage power supply module is controlled to discharge by a controller, and then the air-locking valve is opened so that SF6 and N2 gases are mixed in proportion and injected into the discharge chamber for discharge detection, and the gas components generated during the discharge process are analyzed by a gas chromatography-mass spectrometer GC-MS, so as to obtain accurate experimental data. If a breakdown occurs during the experiment and the voltage suddenly rises, the experimenter can manually cut off the power supply through the controller to stop the experiment, or when the experimental voltage is too high and higher than the set maximum voltage value, the overvoltage protection device will automatically cut off the power supply to terminate the experiment, thereby protecting the experimenter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the structure of the test device for the compatibility of the environmentally friendly mixed insulating gas and materials of the present invention.

[0022] Figure 2 The figure is a schematic diagram of the flow structure of the test method for the compatibility of the environmentally friendly mixed insulating gas and materials according to the present invention.

[0023] Figure 3 This is a photo of the material surface before the experiment.

[0024] Figure 4 This is a photo of the material surface after the experiment.

[0025] Figure 5 This is a curve chart of the change of SO2F2 and time during the experiment.

[0026] Figure 6 This is a curve chart of the change of SO2 and time during the experiment.

[0027] Figure 7 This is a curve diagram of the changes in CF4 and time during the experiment. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0032] Example 1, reference Figure 1-2 , which is the first embodiment of the present invention, provides a test method for the compatibility of environmentally friendly mixed insulating gas with materials. The device includes using anhydrous ethanol to clean the detection device (M) to remove dust and impurities, and flushing it with N2 gas multiple times, and then checking the air tightness of the detection device (M).

[0033] Preferably, a compatibility test is performed by evacuating the interior of the detection device (M) and then filling it with SF6 / N2 mixed gas and materials of different materials, observing the internal air pressure through an air pressure detection device, and then controlling the internal gas ratio through the cooperation of multiple valves.

[0034] In addition, by starting the power module and performing real-time monitoring through the discharge detection and monitoring module, local discharge experiments are carried out using SF6 mixed gases in different proportions, samples are collected every 12 hours, and the by-products are continuously analyzed by gas chromatography-mass spectrometry. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the experimental results are obtained by comparing the material to be tested with the material after the experiment.

[0035] In summary: by starting the power module and performing real-time monitoring through the discharge detection and monitoring module, local discharge experiments are carried out using SF6 mixed gases in different proportions, samples are collected every 12 hours, and the by-products are continuously analyzed by gas chromatography-mass spectrometry. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the experimental results are obtained by comparing the material to be tested with the material after the experiment, thereby completing the compatibility of the material and the insulating gas.

[0036] Example 2, reference Figure 2 to Figure 7 , which is the second embodiment of the present invention, is the second embodiment of the present invention, and provides a test device for the compatibility of environmentally friendly mixed insulating gas with materials, which includes: a vacuuming step of connecting the gas pipe to a vacuum pump, opening the gas release valve, and evacuating the detection device (M) into a vacuum state until the pressure gauge displays -0.1MPa, closing the gas release valve and the vacuum pump, and letting it stand for 1 hour. If there is no change in the pressure gauge after 1 hour, the air tightness of the detection device is good.

[0037] Preferably, the influence of external gas on the experiment is excluded by detecting the sealing of the device, so as to ensure the accuracy of the experiment, and different rubber materials are cut into small thin blocks of 5×5×5 cubic millimeters, placed on the brackets of different closed air chambers, the gas release valve is opened, N2 gas is introduced, and then the vacuum pump is connected to evacuate the discharge air chamber; before testing the material to be tested, a scanning electron microscope is required to perform high-resolution morphological observation on the surface of the material, and the material is observed at 300 times, 2500 times and 10000 times; X-ray photoelectron spectroscopy test is performed to characterize the surface elements of the material and their chemical state.

[0038] Furthermore, after evacuation, the pressure change is observed by a barometer. According to the pressure change, different SF6 / N2 mixture ratios are filled into the detection device (M) to test the compatibility of SF6 / N2 mixed gas with different gas mixture ratios and different materials with the material.

[0039] Preferably, a mixed gas of 10% SF6 / 90% N2 is configured in the closed gas chamber on the right. After the vacuum is evacuated, the pressure gauge displays -0.1MPa. After inflation, the air pressure needs to reach 0.3MPa, then open the inflation valve. When the pressure gauge 4 displays -0.06MPa, close the inflation valve, and then open the exhaust valve so that the pressure gauge displays 0.3MPa, close the exhaust valve, and complete the configuration.

[0040] Furthermore, the discharge experiment starts the high-voltage power supply module, increases the voltage and performs real-time monitoring through the discharge measurement and monitoring module, sets the starting voltage and the test voltage, and controls the voltage to slowly increase from the starting voltage to the required voltage value to perform a partial discharge experiment. The partial discharge experiment is performed for 96 hours under different proportions of SF6 mixed insulating gas, and decomposition gas samples are collected every 12 hours. The collected gas is passed into a gas chromatography-mass spectrometer GC-MS for qualitative and quantitative analysis of the generation characteristics of related gas by-products. After the 96-hour discharge experiment is completed, a scanning electron microscope is used to observe the surface morphology of the material, and the material to be tested is compared with the material after the experiment. If the material after the experiment only undergoes physical changes, the SF6 / N2 mixed gas is compatible.

[0041] Preferably, they are incompatible if chemical changes occur; Figure 3 , Figure 4 These are the rubber surface pictures of the original NBR and after the partial discharge test. It can be found that there are many cracks and some small gaps on the surface of the original NBR under 300 times magnification. After the partial discharge test, it can be seen that there are no more cracks on the rubber surface, but some white crystals are precipitated, and the particles are large. It can be inferred that these may be the crystals of vulcanizers or other additives. At this time, NBR and SF6 mixed gas react chemically, causing the surface to be severely corroded, which reduces the sealing and insulation properties of NBR. Figure 5 , Figure 6 and Figure 7 The curves of the content of the graded products SO2F2, SO2, and CF4 components changing with time are shown respectively. There is a good linear relationship between SO2F2 and the discharge time. When the voltage is higher than 52kV, the SO2 content shows a saturation trend. When the discharge time is 48h and the applied voltage is 58kV, the growth trend of the CF4 content shows a depression. Apart from this, the growth trend generally shows a saturation trend.

[0042] Furthermore, if breakdown occurs during the experiment and the voltage suddenly rises, the experimenter can manually cut off the power supply through the control panel to stop the experiment, or when the experimental voltage is too high, higher than the set maximum voltage value, the overvoltage protection device will automatically cut off the power supply to terminate the experiment.

[0043] In summary: By observing the rubber surface graph and line graph, we can clearly understand the curve of the change of SO2F2, SO2, and CF4 component content over time, so as to select the appropriate material and surface treatment according to the curve change to ensure the long-term stable operation of the equipment. The obtained compatibility experimental data is accurate, the decomposition characteristic data is complete, the quantitative evaluation method is perfect, and the accuracy of the experiment is high.

[0044] Example 3, reference Figure 1, which is the third embodiment of the present invention, comprises: a detection module 100, the detection module 100 comprises a control component 101, an experimental component 102 arranged on the control component 101, a valve component 103 arranged on the experimental component 102, and a storage component 104 arranged on the valve component 103.

[0045] Furthermore, the control component 101 includes a discharge detection system 101a, a monitoring module 101b arranged inside the discharge detection system 101a, a controller 101c arranged on the discharge detection system 101a, a high-voltage power supply module 101d arranged inside the discharge detection system 101a, and a gas chromatograph-mass spectrometer GC-MS101e arranged next to the discharge detection system 101a.

[0046] Preferably, the discharge detection system 101a and the monitoring module 101b are used to monitor the electrical parameters during the discharge process in real time and to ensure the safety of operators and equipment during the experiment. The module consists of a voltage divider, a current sensor, an overvoltage protection device, and a control interface; the voltage divider is used to measure the voltage on the high-voltage electrode and reduce the high-voltage signal to a safe range for reading by the measuring instrument; the overvoltage protection device is used to automatically cut off the power supply when the voltage exceeds the set range to protect equipment and personnel, and the gas chromatography-mass spectrometer GC-MS is used to analyze the gas components generated during the discharge process.

[0047] Furthermore, the experimental assembly 102 includes a wire 102a disposed on the high-voltage power module 101d, a discharge chamber 102b disposed on the wire 102a, a pressure gauge 102c disposed on the discharge chamber 102b, and a support frame 102d.

[0048] Preferably, the high-voltage power supply module 101d is used to provide high voltage, which can be a DC or AC power supply. The module consists of a transformer, a rectifier, a filter, and electrodes; the transformer is used to increase the standard voltage to the required high voltage; the rectifier converts AC power into DC power; the filter is used to smooth the DC output and reduce power supply noise; the electrode is used to introduce high voltage into the material to be tested.

[0049] In addition, the discharge chamber is used to fill with mixed gas for local discharge experiment, and it is necessary to maintain airtightness during the experiment, and two closed chambers are arranged in the discharge chamber, and the two closed chambers form a test group. The test chamber and the control chamber in the same test group are different in only one of the two variables, the mixing ratio of the mixed gas to be tested and the material to be tested. By comparing the test closed chamber with the control closed chamber, the difference in gas mixing ratios or material compatibility between the test closed chamber and the control closed chamber can be more conveniently obtained.

[0050] Furthermore, the valve assembly 103 includes an air inlet pipe 103a disposed on the discharge chamber 102b, a gas valve 103b disposed on the air inlet pipe 103a, a first branch pipe 103c and a second branch pipe 103d disposed on the air inlet pipe 103a, and a gas-blocking valve 103e disposed on the first branch pipe 103c and the second branch pipe 103d.

[0051] Preferably, the branch pipe is used to connect the storage assembly 104 and the discharge chamber 102b, so that the inflow of gas can be controlled through the valve assembly 103, thereby achieving the influence of mixed gases of different proportions on the experiment.

[0052] Furthermore, the storage assembly 104 includes a SF6 gas cylinder 104a disposed on the first branch pipe 103c, and a N2 gas cylinder 104b disposed on the second branch pipe 103d.

[0053] Preferably, the gas cylinder is provided for storing SF6 and N2 gases.

[0054] In summary: the high-voltage power supply module 101d is controlled to discharge through the controller 101c, and then the air-locking valve 103e is opened to allow SF6 and N2 gases to be mixed in proportion and injected into the discharge chamber 102b for discharge detection. The gas components generated during the discharge process are analyzed by the gas chromatography-mass spectrometer GC-MS101e to obtain accurate experimental data. If a breakdown occurs during the experiment and the voltage suddenly rises, the experimenter can manually cut off the power supply to stop the experiment through the controller 101c, or when the experimental voltage is too high and higher than the set maximum voltage value, the overvoltage protection device will automatically cut off the power supply to terminate the experiment, thereby protecting the experimenter.

[0055] The remaining structure is the same as that of Example 2.

[0056] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0057] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A test method for compatibility of environmentally friendly mixed insulating gas with materials, characterized in that: include, S1. Clean the detection device (M) with anhydrous ethanol to remove dust and impurities, and flush it with N2 gas several times, and then check the air tightness of the detection device (M); S2. The compatibility test is conducted by evacuating the interior of the detection device (M), and then filling it with SF6 / N2 mixed gas of different materials and materials, and observing the internal air pressure through the air pressure detection device, and then controlling the proportion of the internal gas through the cooperation of multiple valves; and, S3. Start the power module and conduct real-time monitoring through the discharge detection and monitoring module, so as to conduct partial discharge experiments through SF6 mixed gas with different proportions, collect samples every 12 hours, and continue to analyze the by-products through gas chromatography-mass spectrometry. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the experimental results are obtained by comparing the material to be tested with the material after the experiment.

2. The test method for compatibility of environmentally friendly mixed insulating gas with materials according to claim 1 is characterized in that: The vacuuming step is to connect the air pipe to the vacuum pump, open the gas release valve, and evacuate the detection device (M) into a vacuum state until the pressure gauge shows -0.1MPa, close the gas release valve and the vacuum pump, and let it stand for 1 hour. If the pressure gauge does not change after 1 hour, the air tightness of the detection device is good.

3. The test method for compatibility of environmentally friendly mixed insulating gas with materials according to claim 2 is characterized in that: After the vacuuming, the pressure change is observed by a barometer. According to the pressure change, different SF6 / N2 mixed ratios are filled into the detection device (M) to test the compatibility of SF6 / N2 mixed gases with different gas mixing ratios and different materials with the materials.

4. The test method for compatibility of environmentally friendly mixed insulating gas with materials according to claim 3 is characterized in that: The discharge experiment starts the high-voltage power supply module, increases the voltage and performs real-time monitoring through the discharge measurement and monitoring module, sets the starting voltage and the test voltage, and controls the voltage to slowly increase from the starting voltage to the required voltage value to perform a partial discharge experiment. The partial discharge experiment is performed for 96 hours under different proportions of SF6 mixed insulating gas, and decomposition gas samples are collected every 12 hours. The collected gas is passed into a gas chromatography-mass spectrometry (GC-MS) for qualitative and quantitative analysis of the generation characteristics of related gas by-products. After the 96-hour discharge experiment is completed, the surface morphology of the material is observed using a scanning electron microscope, and the material to be tested is compared with the material after the experiment. If the material after the experiment only undergoes physical changes, the SF6 / N2 mixed gas is compatible.

5. The test method for compatibility of environmentally friendly mixed insulating gas with materials according to claim 4 is characterized in that: If a breakdown occurs during the experiment and the voltage suddenly rises, the experimenter can manually cut off the power supply through the control panel to stop the experiment; or when the experimental voltage is too high, higher than the set maximum voltage value, the overvoltage protection device will automatically cut off the power supply to terminate the experiment.

6. A test device for the compatibility of environmentally friendly mixed insulating gas and materials, characterized by: The detection device (M) comprises any one of claims 1 to 5, and A detection module (100), the detection module (100) comprising a control component (101), an experimental component (102) arranged on the control component (101), a valve component (103) arranged on the experimental component (102), and a storage component (104) arranged on the valve component (103).

7. The test device for compatibility of environmentally friendly mixed insulating gas and materials according to claim 6, characterized in that: The control component (101) comprises a discharge detection system (101a), a monitoring module (101b) arranged inside the discharge detection system (101a), a controller (101c) arranged on the discharge detection system (101a), a high-voltage power supply module (101d) arranged inside the discharge detection system (101a), and a gas chromatograph-mass spectrometer GC-MS (101e) arranged next to the discharge detection system (101a).

8. The test device for compatibility of environmentally friendly mixed insulating gas and materials according to claim 7, characterized in that: The experimental assembly (102) comprises a wire (102a) arranged on the high-voltage power supply module (101d), a discharge chamber (102b) arranged on the wire (102a), a pressure gauge (102c) arranged on the discharge chamber (102b), and a support frame (102d).

9. The test device for compatibility of environmentally friendly mixed insulating gas and materials according to claim 8, characterized in that: The valve assembly (103) comprises an air inlet pipe (103a) arranged on the discharge chamber (102b), a gas valve (103b) arranged on the air inlet pipe (103a), a first branch pipe (103c) and a second branch pipe (103d) arranged on the air inlet pipe (103a), and a gas-blocking valve (103e) arranged on the first branch pipe (103c) and the second branch pipe (103d).

10. The test device for compatibility of environmentally friendly mixed insulating gas and materials according to claim 9, characterized in that: The storage assembly (104) comprises an SF6 gas cylinder (104a) arranged on the first branch pipe (103c), and an N2 gas cylinder (104b) arranged on the second branch pipe (103d).

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