Leakage detection method for environment-friendly GIS equipment

Abstract

The embodiment of the invention provides a leakage detection method for environment-friendly GIS equipment. The method comprises the step of detecting whether the sealing cavity of the environment-friendly GIS equipment leaks or not by using 18O isotope as an isotope tracing element, so that the method can be used for detecting whether the sealing cavity of the environment-friendly GIS equipment leaks or not, thereby solving the problems in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of GIS equipment, and particularly to a leakage detection method for an environmentally friendly GIS equipment. Background Art

[0002] In practical applications, it is usually necessary to use environmentally friendly GIS equipment to remotely transmit high-voltage electricity. As shown in Figure 1 the structural schematic diagram of the environmentally friendly GIS equipment, the environmentally friendly GIS equipment includes a housing 1 and a cable 2 disposed inside the housing 1, and the cavity therebetween is a sealed cavity. In addition, since the high-voltage electricity is transmitted by the environmentally friendly GIS equipment, there is a risk that the cable 2 and the housing 1 may be broken down by the high-voltage electricity.

[0003] To address this risk, high-pressure clean air (the air pressure needs to reach more than 6 atmospheres) is usually injected into the sealed cavity between the housing 1 and the cable 2 as an insulating medium. However, if the sealed cavity of the environmentally friendly GIS equipment leaks, the insulation performance may be reduced due to the insufficient air pressure, which may easily lead to failures of the environmentally friendly GIS equipment. Therefore, how to detect the leakage of the environmentally friendly GIS equipment is crucial. Summary of the Invention

[0004] The purpose of the embodiments of this application is to propose a leakage detection method for an environmentally friendly GIS equipment to solve the problems in the prior art.

[0005] To solve the above technical problems, the embodiments of this application provide a leakage detection method for an environmentally friendly GIS equipment, and the adopted technical solution is as follows: Using 18 O isotope as an isotope tracer element to detect whether there is a leak in the sealed cavity of the environmentally friendly GIS equipment.

[0006] Preferably, the concentration of 18 O isotope in the air sealed in the sealed cavity is a target concentration greater than the natural abundance, where the natural abundance is specifically the abundance of 18 O isotope in the natural ambient air; and using 18 O isotope as an isotope tracer element to detect whether there is a leak in the sealed cavity of the environmentally friendly GIS equipment specifically includes: Collecting the ambient air near at least one measured point in the environmentally friendly GIS equipment; Detecting the actual abundance of 18 O isotope in the collected ambient air; Judging whether there is a leak in the sealed cavity of the environmentally friendly GIS equipment according to the magnitude relationship between the actual abundance and the natural abundance.

[0007] Preferably, the number of the measured points is multiple; and, when there is a leakage in the sealed cavity of the environmental protection GIS device, the method further includes: Dividing the multiple measured points into multiple groups; For each group, according to the average abundance of 18 O isotope in the ambient air near each measured point in the group and the size of the natural abundance, determining whether there is a leakage point for each measured point in the group.

[0008] Preferably, the method further includes: For the group with a leakage point, respectively according to the second actual abundance of 18 O isotope in the ambient air near each measured point, and the size of the natural abundance, determining the measured points with leakage points.

[0009] Preferably, detecting the actual abundance of 18 O isotope in the collected ambient air specifically includes: Separating oxygen in the ambient air by gas chromatography; Testing the abundance of 18 O isotope of the separated oxygen by an isotope mass spectrometer to obtain the actual abundance.

[0010] Preferably, the conditions of the gas chromatography include: The length of the gas chromatography column is greater than or equal to 3 meters, and the inner diameter is greater than or equal to 2 millimeters; The carrier gas is helium; The carrier gas flow rate is 20 mL / min to 30 mL / min; The column temperature of the gas chromatography column is -75°C to -80°C.

[0011] Preferably, the method further includes: Mixing oxygen with 18 O isotope at a first concentration with clean air in a set ratio through a gas mixer so that in the mixed clean air, 18 the concentration of O isotope is the target concentration; wherein, the first concentration is greater than the target concentration;

[0012] Preferably, the target concentration is specifically a mass fraction greater than or equal to 1.5%; and, the multiple preset injection ports are specifically multiple uniformly distributed preset injection ports.

[0013] Preferably, according to the magnitudes of the actual abundance and the natural abundance, it is determined whether there is a leak in the sealed cavity of the environmental protection GIS device, specifically including: Determine whether the deviation between the actual abundance and the natural abundance is less than a preset threshold; If so, there is no leak in the sealed cavity of the environmental protection GIS device; or, If not, there is a leak in the sealed cavity of the environmental protection GIS device.

[0014] Preferably, using 18 O isotope as an isotope tracer element to detect whether there is a leak in the sealed cavity of the environmental protection GIS device, specifically including: periodically using 18 O isotope as an isotope tracer element to detect whether there is a leak in the sealed cavity of the environmental protection GIS device.

[0015] The present application provides a method for detecting leaks in an environmental protection GIS device, including using 18 O isotope as an isotope tracer element, which can detect whether there is a leak in the sealed cavity of the environmental protection GIS device, thereby solving the problems in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present application, the following will briefly introduce the drawings required for description in the embodiments of the present application. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of an environmental protection GIS device in the prior art; Figure 2 is a schematic flowchart of a method for detecting leaks in an environmental protection GIS device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the embodiments of this application herein are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects, not to describe a specific order.

[0019] References to "embodiments" in this specification mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0020] As described above, it is necessary to detect the leakage of the environmentally friendly GIS device, especially its sealed cavity, so as to prevent the leakage of clean air in the sealed cavity, which may lead to a reduction in insulation performance and further cause a failure of the environmentally friendly GIS device.

[0021] However, in the actual leakage detection process, since the sealed cavity of the environmentally friendly GIS device is sealed, it is usually difficult to directly detect the air pressure inside it through, for example, a pressure sensor. Moreover, even if a pressure sensor is installed inside the sealed cavity, it is difficult to perform maintenance when the pressure sensor fails, which undoubtedly increases the difficulty of leakage detection.

[0022] In view of this, the embodiments of the present application provide a method for detecting the leakage of an environmentally friendly GIS device. The core of this method is to use 18 O isotope as an isotope tracer element to detect whether there is leakage in the sealed cavity of the environmentally friendly GIS device.

[0023] Among them, 18 O isotope is a heavy isotope of oxygen. Its atom contains 8 protons and 10 neutrons and is stable in nature. In addition, in natural ambient air, 18 the abundance of

[0024] O isotope (referred to as natural abundance) is about 0.2%. Herein, the abundance and concentration (such as the target concentration) in this application are all mass ratios, and this will not be elaborated further hereinafter. 18 Therefore, in this application, the isotope tracer method is used to detect whether the environmentally friendly GIS device leaks. The isotope tracer element is 18 O isotope. In the detection process of the isotope tracer method, it is mainly to use 18 the difference in the abundance of 18 O isotope to determine whether there is leakage. Specifically, for example, one way is to increase the content of 18 O isotope in the clean air inside the sealed cavity, and then collect the gas in the environment near the sealed cavity and detect the abundance of 18The abundance of the O isotope will be significantly greater than the natural abundance. Conversely, if no leakage occurs, the two will be substantially equal, thus being able to detect whether the sealed chamber is leaking.

[0025] The main difference between the clean air and the air under natural conditions is that the clean air has a lower content of impurities such as moisture and dust. Therefore, the higher content of impurities such as moisture and dust in the air can easily lead to breakdown under high voltage. Therefore, the sealed cavity uses clean air with a lower impurity content. For the specific generation method of the clean air, for example, air under natural conditions can be collected, and then relevant technologies can be used to remove impurities such as moisture and dust therein to make it meet relevant standards, thereby obtaining the clean air.

[0026] In addition, considering that the content of impurities such as moisture and dust in the air under natural conditions is only below 0.1%, the main components of clean air and air under natural conditions are basically the same, both are nitrogen and oxygen. The only difference between the two is that the impurity content in clean air is lower.

[0027] Another way is to reduce the clean air in the sealed chamber. 18 O isotope content, such as 18 The natural abundance of O isotopes is 0.2%. 18 The content of O isotope is reduced to about 0.02%. The specific method is to use isotope separation and other methods to extract part of the clean air. 18 O isotope, thereby reducing its 18 In this way, the gas in the environment near the sealed chamber can also be collected and the content of O isotopes can be detected. 18 O isotope abundance, and then compare this abundance with 18 The natural abundance of O isotopes is compared. If a leak occurs, then the gas 18 The abundance of the O isotope will be significantly lower than the natural abundance. On the contrary, if no leakage occurs, the two will be substantially equal, thus being able to detect whether the sealed chamber is leaking.

[0028] Therefore, in the detection process of the isotope tracer method adopted in the present application, any of the above methods can be adopted, that is, the clean air in the sealed cavity can be improved. 18 O isotope content, or reduce the clean air in the sealed chamber 18 O isotope content, and then use 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealing cavity of the environmental protection GIS equipment.

[0029] Using the method provided in the embodiment of the present application, using 18As an isotope tracer element, the O isotope can detect whether there is leakage in the sealed cavity of the environmental protection GIS device.

[0030] It should be further noted that in practical applications, hydrogen or helium is usually also used as a tracer element. For example, a small amount of hydrogen can be added to the clean air in the sealed cavity, and then the content of hydrogen near the environmental protection GIS device can be detected to determine whether there is leakage in the sealed cavity of the environmental protection GIS device. Similarly, hydrogen can be replaced with helium for this detection.

[0031] However, since the molecular weights of hydrogen or helium are quite different from the average molecular weight of air, the densities of hydrogen or helium are also quite different from the density of air. During the long-term operation of the environmental protection GIS device, stratification is likely to occur. At this time, hydrogen or helium agglomerates in layers in some areas, resulting in uneven mixing with the clean air in the sealed cavity and affecting the accuracy of detection. Among them, the content of nitrogen in air (including clean air) is about 75%, and the content of oxygen is about 25%. Therefore, the average molecular weight of air is about 14.5, the molecular weight of hydrogen is 2, and the molecular weight of helium is also 2.

[0032] And this application uses 18 The O isotope as an isotope tracer element has the same chemical properties and basically the same physical properties as the oxygen molecules in the air. Therefore, during the long-term operation of the environmental protection GIS device, stratification is relatively unlikely to occur. Compared with using hydrogen or helium as a tracer element, it can improve the accuracy of detection.

[0033] As mentioned above, it is possible to increase the content of the O isotope in the clean air in the sealed cavity, or reduce the content of the O isotope in the clean air in the sealed cavity, and then use the O isotope as an isotope tracer element to detect whether there is leakage in the sealed cavity of the environmental protection GIS device. In practical applications, both of these methods are feasible. However, considering separating the O isotope from the clean air to reduce its content, in the case of a large amount of clean air, the cost will be significantly increased. Therefore, a preferred method in this application can be to increase the content of the O isotope in the clean air in the sealed cavity. 18 O isotope content, or reduce the 18 O isotope content in the clean air in the sealed cavity, and then use 18 O isotope as an isotope tracer element to detect whether there is leakage in the sealed cavity of the environmental protection GIS device. In practical applications, both of these methods are feasible, but considering separating 18 O isotope from the clean air to reduce its 18 O isotope content, in the case of a large amount of clean air, the cost will be significantly increased. Therefore, a preferred method in this application can be to increase the 18 O isotope content in the clean air in the sealed cavity.

[0034] Specifically, the concentration of the O isotope in the clean air sealed in the sealed cavity is the target concentration, and this target concentration is greater than the natural abundance, that is, the 18 O isotope in the clean air 18The abundance of O isotopes is increased from 0.2% of the natural abundance to the target concentration. The target concentration will affect the accuracy of subsequent test results, and the higher the target concentration, the higher the accuracy of the test results. 18 The increase in O isotope abundance increases the cost. Therefore, the target concentration needs to be greater than or equal to a certain minimum value to meet the minimum accuracy requirement. Through actual testing, the minimum value can be 1.5%, that is, the target concentration is greater than or equal to 1.5%. For example, the target concentration can be 1.5%, 2%, 2.5%, 3%, etc.

[0035] Thus, the method provided by the embodiment of the present application is to use 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealed cavity of environmental protection GIS equipment. The specific implementation method can be as follows: Figure 2 As shown, the following steps are included: Step S41: collecting ambient air near at least one measured point in the environmental protection GIS equipment.

[0036] The measured point may be a point in the shell of the environmental GIS equipment where there is a potential leakage risk. Specifically, the shell of the environmental GIS equipment usually has welding points, sealing rings, sealing valves, etc., and the presence of welding points, sealing rings, and sealing valves will inevitably be accompanied by potential leakage risks. For example, there may be welding gaps in the welding points, and there may be leakage on the sealing surfaces of the sealing rings and sealing valves. Therefore, the points in the environmental GIS equipment where sealing rings or sealing valves are provided, as well as the welding points, can be used as the measured points to collect the ambient air near the measured points, that is, the air in the environment near the measured points. At this time, if the measured point leaks, due to the clean air in the sealed cavity, 18 The concentration of O isotope (its concentration is the target concentration) is greater than 18 The natural abundance of O isotopes, therefore, the ambient air near the measured point 18 The actual abundance of the O isotope will also be greater than the natural abundance.

[0037] As for the specific implementation of step S41, in actual application, a suction gun can be used to collect the air of the surrounding environment at each measured point. Of course, the collected surrounding air can be stored in a sealed air bag for subsequent detection.

[0038] The sealed air bag may be an aluminum foil air sampling bag with high inertness and air tightness, thereby preventing the relevant components in the sampled nearby ambient air from reacting with the material of the sealed air bag and affecting the accuracy of the detection results.

[0039] In addition, in order to further improve the accuracy of the detection results, in practical applications, the sampling volume of the ambient air near the measured point is usually about 200 mL, so as to avoid inaccurate detection results caused by too little sampling volume.

[0040] In addition, if it is necessary to detect whether there is leakage in the sealed cavity of the environmental protection GIS device for a long time, a detection period can usually be set. For example, the detection period can be 1 month, 3 months, 6 months, etc., so as to periodically use 18 O isotope as an isotope tracer element to detect whether there is leakage in the sealed cavity of the environmental protection GIS device. At this time, in this step S41, correspondingly, the ambient air near at least one measured point in the environmental protection GIS device can be periodically collected.

[0041] It should be further noted that the at least one measured point mentioned in step S41 can be one measured point or multiple measured points. For example, for a certain measured point, the method provided by the embodiments of the present application can be used to detect whether there is leakage. In this way, this measured point can be used as the measured point in this step S41, and then other steps of the embodiments of the present application can be executed.

[0042] Step S42: Detect the actual abundance of 18 O isotope in the collected ambient air near.

[0043] In practical applications, the 18 O isotope abundance test is usually carried out by an isotope mass spectrometer to obtain the actual abundance. Therefore, the specific implementation manner of this step S42 can be to carry out the 18 O isotope abundance test on the ambient air near by an isotope mass spectrometer to obtain the actual abundance.

[0044] However, considering that various impurities will be contained in the ambient air near, in order to avoid the interference caused by these impurities, when carrying out the 18 O isotope abundance test by an isotope mass spectrometer, the oxygen in the ambient air near can be separated first, and then the 18 O isotope abundance test is carried out on the oxygen by an isotope mass spectrometer. Therefore, another implementation manner of this step S42 can be to first separate the oxygen in the ambient air near by gas chromatography, and then carry out the 18 O isotope abundance test on the separated oxygen by an isotope mass spectrometer, so as to obtain the actual abundance. Among them, the actual abundance can be denoted as R_GIS.

[0045] Among them, in the process of separating oxygen in the ambient air near the location by gas chromatography, considering the molecular characteristics of oxygen and nitrogen in the air, in order to achieve the separation of oxygen, the conditions of the gas chromatography method may include: the length of the gas chromatography column is greater than or equal to 3 meters, and the inner diameter is greater than or equal to 2 millimeters. For example, the gas chromatography column can be a column with a length of 3.05 meters and an inner diameter of 2 millimeters; since nitrogen and oxygen in the air are separated, the carrier gas of this gas chromatography method can be helium, and of course it can also be neon, but it cannot be nitrogen; among them, the carrier gas flow rate of this gas chromatography method can be 20 mL / min to 30 mL / min, for example, it can be specifically 25 mL / min; the column temperature of the gas chromatography column of this gas chromatography method can be -75°C to -80°C, for example, it can be -77.8°C. Thus, under these conditions, oxygen in the ambient air near the location is separated by gas chromatography. Of course, during this separation process, a thermal conductivity detector (TCD) can be used to monitor the eluting gas, so as to determine the progress of the separation through the eluting gas. Generally speaking, oxygen peaks at about 40 minutes.

[0046] After separating oxygen in the ambient air near the location, the oxygen is then analyzed by an isotope mass spectrometer for 18 O isotope abundance test, and then the actual abundance can be obtained. Among them, the isotope mass spectrometer can also be calibrated first to ensure the accuracy of the instrument. During the 18 O isotope abundance test by the isotope mass spectrometer, the measurement conditions can be: data processing uses the peak area integration method and automatic baseline correction. After abnormal data is removed, a standardized result is output through the multiple measurement average algorithm.

[0047] Of course, air in the natural environment can also be collected, and then the natural abundance of 18 O isotope in the air can be measured by the same method. Among them, the natural abundance can be denoted as R_env.

[0048] Step S43: Determine whether there is a leak in the sealed cavity of the environmental protection GIS device according to the magnitudes of the actual abundance and the natural abundance.

[0049] After obtaining the actual abundance of 18 O isotope in the ambient air near the location collected through the above-mentioned step S42, in this step S43, it can be determined whether there is a leak in the sealed cavity of the environmental protection GIS device according to the magnitudes of the actual abundance and the natural abundance. In practical applications, if the actual abundance is significantly greater than the natural abundance, it indicates that there is a leak in the sealed cavity of the environmental protection GIS device; otherwise, it indicates that there is no leak.

[0050] Among them, it is possible to judge whether it is significantly greater than by setting a preset threshold. Specifically, the deviation between the actual abundance and the natural abundance can be calculated first. This deviation can be the difference between the two or the ratio between the two. After calculating this deviation, it is judged whether this deviation is less than the preset threshold. If this deviation is less than the preset threshold, it means that the actual abundance is not significantly greater than the natural abundance, and further indicates that there is no leakage in the sealed cavity of the environmental protection GIS device; on the contrary, if this deviation is greater than or equal to the preset threshold, it means that the actual abundance is significantly greater than the natural abundance, and further indicates that there is a leakage in the sealed cavity of the environmental protection GIS device.

[0051] As mentioned above, in the clean air in the sealed cavity of the environmental protection GIS device 18 The O isotope has a content of the target concentration. At this time, in order to obtain 18 Clean air with the O isotope at this target concentration and inject this clean air into the sealed cavity of the environmental protection GIS device, the method may further include 18 Oxygen with the O isotope at the first concentration is mixed with clean air by a gas mixer in a set ratio, so that in the mixed clean air, 18 The concentration of the O isotope is this target concentration, where the first concentration is greater than the target concentration.

[0052] Then, the mixed clean air is injected into the sealed cavity of the environmental protection GIS device through multiple preset injection ports in the environmental protection GIS device. Among them, in order to make the mixed clean air evenly distributed in the sealed cavity, the multiple preset injection ports can be multiple evenly distributed preset injection ports. For example, these preset injection ports are evenly distributed on the outer shell of the environmental protection GIS device, and thus the mixed clean air can be evenly injected into the sealed cavity through these preset injection ports, avoiding the appearance of dead zones.

[0053] It should be further noted that as mentioned in step S41 above, the number of measured points in step S41 can be one or more measured points. For example, when the number of measured points is one, the leakage detection of the sealed cavity can be realized through the above steps S41 to S43.

[0054] In practical applications, the housing of the environmental protection GIS device usually includes multiple measured points. At this time, one implementation method can be to respectively monitor whether there is leakage at each measured point through the above steps S41 to S43, and then finally realize the monitoring of whether there is leakage in the sealed cavity of the environmental protection GIS device.

[0055] Of course, in order to further improve the monitoring efficiency, a grouped detection method can also be adopted. For example, at this time, the number of measured points in step S41 can be multiple, so that the ambient air near multiple measured points can be collected. At this time, the air is the mixed air of the ambient air near multiple measured points. Then, the actual abundance of 18 O isotope in this mixed air is detected. Then, according to the magnitude relationship between the actual abundance and the natural abundance, it is determined whether there is a leak in the sealed cavity of the environmental protection GIS device. Obviously, at this time, the actual abundance is the average abundance of 18 O isotope in the ambient air near multiple measured points. Therefore, if the actual abundance is significantly greater than the natural abundance, it can also indicate that there is a leak in the sealed cavity of the environmental protection GIS device.

[0056] In particular, when it is detected that there is a leak in the sealed cavity of the environmental protection GIS device, the method provided by the embodiment of the present application can further locate the leak point, that is, locate to one or several measured points where leaks are determined to exist. At this time, the method can further include: first dividing the multiple measured points into multiple groups, with at least one measured point in each group; then, for each group respectively, according to the average abundance of 18 O isotope in the ambient air near each measured point in the group and the magnitude relationship with the natural abundance, it is determined whether there is a leak point in each measured point in the group.

[0057] For example, at this time, the ambient air near each measured point in the group can be collected in units of groups. The collected ambient air is also the mixed air of the air near each measured point in the group. Then, based on the same principle as step S42 above, the actual abundance of 18 O isotope can be detected, and according to the magnitude relationship between the actual abundance and the natural abundance, it is determined whether there is a leak point in each measured point in the group. For example, if the actual abundance is significantly greater than the natural abundance, it indicates that there is a leak point in each measured point in the group; otherwise, it indicates that there is no leak point in each measured point in the group. In this way, through this grouped method, it is possible to quickly locate which groups of measured points specifically have leak points, and the detection efficiency can be improved.

[0058] Another parallel solution can be that when it is detected that there is a leak in the sealed cavity of the environmental protection GIS device, first divide the multiple measured points into two groups, and then for the first group, according to the average abundance of 18 O isotope in the ambient air near each measured point in the first group and the magnitude relationship with the natural abundance, it is determined whether there is a leak point in each measured point in the first group. At this time, if there is no leak point in each measured point in the first group, it can also indicate that there is a leak point in each measured point in the second group.

[0059] Therefore, when leakage is detected in the sealing cavity of the environmental protection GIS equipment, the measured points can be further divided into multiple groups (greater than two groups) or two groups, so that the leakage points can be quickly located in which specific groups of measured points, thereby improving the efficiency of detection.

[0060] Of course, after locating which groups of measured points have leaks, you can also target the groups with leaks and calculate the leaks based on the ambient air near each measured point. 18 The second actual abundance of the O isotope and the size of the natural abundance are used to determine the measured point where the leakage point exists. At this time, the ambient air near each detection point in the group where the leakage point exists can be collected respectively, and then the above-mentioned steps S42 and S43 can be used to determine whether there is a leakage point at the detection point, so as to finally accurately locate the leakage point.

[0061] Those of ordinary skill in the art can understand and implement all or part of the processes in the above-mentioned embodiment method.It should be understood that, although the various steps in the flowchart of the accompanying drawings are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows.Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and they can be performed in other orders.In addition, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0062] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A leakage detection method for environmental GIS equipment, characterized in that: use 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealed cavity of environmental protection GIS equipment.

2. The method according to claim 1, characterized in that The air sealed in the sealed cavity 18 The concentration of O isotope is greater than the target concentration of natural abundance, wherein the natural abundance is specifically the concentration of 18 O isotope abundance; and, using 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealed cavity of environmental protection GIS equipment, including: Collecting ambient air near at least one measured point in the environmental GIS device; Detection of the collected ambient air 18 The actual abundance of the O isotope; According to the difference between the actual abundance and the natural abundance, it is determined whether there is leakage in the sealing cavity of the environmental protection GIS equipment.

3. The method according to claim 2, characterized in that The number of the measured points is multiple; and, in the case where there is leakage in the sealed cavity of the environmental protection GIS equipment, the method further includes: Dividing the plurality of measured points into a plurality of groups; For each group, according to the ambient air near each measured point in the group 18 The average abundance of O isotopes and the size of the natural abundance are used to determine whether there are leakage points at each measured point in the group.

4. The method according to claim 3, characterized in that The method further comprises: For the group with leakage points, the ambient air near each measured point is 18 The second actual abundance of the O isotope and the magnitude of the natural abundance determine the measured point where a leak occurs.

5. The method according to claim 2, characterized in that: Detection of the collected ambient air 18 The actual abundance of O isotopes includes: Separating oxygen from the ambient air using gas chromatography; The separated oxygen was analyzed by isotope mass spectrometry. 18 O isotope abundance test to obtain the actual abundance.

6. The method according to claim 5, characterized in that The conditions of the gas chromatography include: The length of the gas chromatographic column is greater than or equal to 3 meters and the inner diameter is greater than or equal to 2 mm; The carrier gas is helium; The carrier gas flow rate is 20mL / min~30mL / min; The column temperature of the gas chromatography column is -75°C~-80°C.

7. The method according to claim 2, characterized in that The method further comprises: Will 18 Oxygen with a first concentration of O isotope is mixed with clean air at a set ratio through a gas mixer, so that the mixed clean air contains: 18 The concentration of O isotope is the target concentration; wherein the first concentration is greater than the target concentration; The mixed clean air is injected into the sealed cavity of the environmental protection GIS device through a plurality of preset injection ports in the environmental protection GIS device.

8. The method according to claim 2 or 7, characterized in that: The target concentration is specifically greater than or equal to 1.5% by mass; and The multiple preset injection ports are specifically multiple preset injection ports that are evenly distributed.

9. The method according to claim 2, characterized in that: According to the actual abundance and the natural abundance, judging whether there is leakage in the sealing cavity of the environmental protection GIS equipment specifically includes: Determining whether a deviation between the actual abundance and the natural abundance is less than a preset threshold; If so, there is no leakage in the sealing cavity of the environmental protection GIS equipment; or, If not, there is leakage in the sealing cavity of the environmental protection GIS equipment.

10. The method according to claim 1, characterized in that use 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealed cavity of environmental protection GIS equipment. Specifically, it includes: periodically using 18 O isotope is used as an isotope tracer element to detect whether there is leakage in the sealed cavity of environmental protection GIS equipment.

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