An SF6 infrared imaging leak detector imaging sensitivity evaluation device and evaluation method

Abstract

This invention discloses an imaging sensitivity evaluation device and method for an SF6 infrared imaging leak detector. The evaluation device includes an SF6 infrared imaging leak detector to be evaluated; it also includes a control module, a leak source, an automatic gas replenishment system, and an error evaluation system. The leak source includes a trace leak system and a random leak system. The control module is used to set the gas leakage rate and the target leak location. The trace leak system can release a standard trace amount of SF6 gas into the random leak system according to the gas leakage rate set by the control module. The random leak system includes an outer experimental chamber and an inner experimental chamber. The automatic gas replenishment system is used to replenish SF6 gas in a timely manner when the SF6 gas inside the trace leak system is exhausted. The error evaluation system is used to display the gas leakage rate of the inner experimental chamber and the position of the leak hole corresponding to the target leak location. This invention provides accurate sensitivity evaluation for SF6 infrared imaging leak detectors.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic and energy storage resource allocation technology, and more specifically, to an imaging sensitivity evaluation device and evaluation method for an SF6 infrared imaging leak detector. Background Technology

[0002] When an SF6 gas leak is detected in the area, the infrared energy reflected to the detection equipment is drastically reduced due to the strong absorption of infrared light by SF6 gas. SF6 gas appears as black smoke on the display, and its darkness varies with gas concentration. Studies show that the strongest absorption band of SF6 gas is around 10.6 μm. Using a thermal imager with an operating wavelength of 10.0–11.0 μm, the smoke-like SF6 leak can be observed. In this way, the source of the SF6 gas leak can be quickly and accurately determined. Compared to other methods such as ultraviolet ionization detection, ultrasonic leak detection, and laser imaging leak detection, the SF6 infrared imaging detection method utilizes the stronger absorption capacity of SF6 gas for long-wave infrared light than air. It employs backscattering imaging technology to image the gas, making it a cutting-edge SF6 gas leak detection technology. It boasts advantages such as high sensitivity, compact and lightweight instrument, and long-distance detection, significantly reducing the complexity of SF6 gas leak inspection work, improving detection accuracy and efficiency, and showing a trend of replacing other detection methods.

[0003] With the widespread application of SF6 infrared imaging leak detectors, the focal plane imaging system experiences drift after prolonged and frequent operation, leading to a significant decrease in imaging sensitivity. Currently, there is no established laboratory evaluation system to test the imaging sensitivity and other performance parameters of infrared imaging leak detectors; these parameters are based on manufacturer-provided specifications and cannot be verified. If the imaging sensitivity of SF6 gas infrared imaging leak detectors decreases, it may cause false or missed detections of gas leaks in equipment, threatening the safe and stable operation of power equipment and causing significant losses to power production. Therefore, establishing an evaluation device and method for assessing the imaging sensitivity of SF6 infrared imaging leak detectors is of paramount importance. Summary of the Invention

[0004] The purpose of this invention is to provide an imaging sensitivity evaluation device and method for SF6 infrared imaging leak detectors. This invention addresses the problem that the focal plane imaging system of SF6 infrared imaging leak detectors will drift after long-term and frequent operation, resulting in a significant decrease in imaging sensitivity. The invention provides a precise sensitivity evaluation of the imaging of SF6 infrared imaging leak detectors.

[0005] To achieve the above objectives, an imaging sensitivity evaluation device for an SF6 infrared imaging leak detector is provided, comprising an SF6 infrared imaging leak detector to be evaluated; and further comprising a control module, a leak source, an automatic gas replenishment system, and an error evaluation system; wherein the leak source includes a trace leak system and a random leak system;

[0006] The control module is used to set the gas leakage rate and the target leakage location, and also to acquire the gas leakage rate and the target leakage location measured by the SF6 infrared imaging leak detector.

[0007] The micro-leakage system can release a standard trace amount of SF6 gas to the random leak system according to the gas leakage rate set by the control module, and the released gas flow rate is continuously adjustable; the micro-leakage system is electrically connected to the control module.

[0008] The random leakage system includes an outer experimental chamber and an inner experimental chamber. The inner experimental chamber is fixedly installed inside the outer experimental chamber. The outer experimental chamber is used to receive SF6 gas released by the micro-leakage system. The inner experimental chamber has several leakage holes on its four sides. Each leakage hole is equipped with a solenoid valve. The leakage target location is one or more of the leakage holes. The inner experimental chamber can open the solenoid valve on the leakage hole corresponding to the leakage target location set by the control module. The outer experimental chamber is equipped with an exhaust solenoid valve. The gas path of the micro-leakage system is connected to a bidirectional solenoid valve. The gas path of the bidirectional solenoid valve is connected to the interior of the outer experimental chamber and electrically connected to the control module.

[0009] The automatic gas replenishment system is used to replenish SF6 gas in a timely manner when the SF6 gas inside the micro-leakage system runs out;

[0010] The error assessment system is used to display the gas leakage rate of the inner experimental chamber and the position of the leak hole corresponding to the leak target location. Based on the gas leakage rate and leak target location obtained by the control module from the SF6 infrared imaging leak detector, the leakage rate error and the leak target location error are calculated respectively.

[0011] The control module is connected to the error assessment system and the automatic air replenishment system, respectively.

[0012] Specifically, the micro-leakage system includes a booster; the booster includes a stepper motor, a lead screw, a piston, and a metering cylinder; the stepper motor is connected to the piston via the lead screw; the piston is mounted and moves within the metering cylinder; the metering cylinder's air circuit is connected to a two-way solenoid valve;

[0013] Specifically, the stepper motor is an externally driven stepper motor with a voltage of 4.5V and a current of 0.5A. Each step length is 0.0127mm, the motor step angle is 1.8°, and the body length is 34mm. The lead screw has a lead of 0.635mm and a step length of 0.003175mm.

[0014] Specifically, the internal structure of the metering cylinder is designed as a uniform cylindrical cavity.

[0015] Specifically, the automatic gas replenishment system includes a pressure reducing valve, a three-way solenoid valve, and an SF6 cylinder; the pressure reducing valve is connected to one switch of the three-way solenoid valve and the SF6 cylinder via a gas circuit; one switch of the three-way solenoid valve is connected to the output terminal of the micro-leakage system.

[0016] Specifically, the control module is a tablet computer with a touch screen.

[0017] Specifically, the random leakage system includes an independent solenoid valve control unit with multiple parallel outputs; the independent solenoid valve control unit is connected to several solenoid valves; and the independent solenoid valve control unit is connected to a controller module.

[0018] Specifically, the leakage nozzle of the solenoid valve adopts a cross-shaped rubber opening design.

[0019] Specifically, four connecting strips are fixedly installed between the four surfaces of the outer experimental chamber and the inner experimental chamber.

[0020] A method for evaluating the imaging sensitivity of an SF6 infrared imaging leak detector, including experimental steps and sensitivity evaluation steps;

[0021] The experimental procedure includes the following sub-steps:

[0022] The gas leakage rate is set through the control module, and a leak hole is selected as the target location for leakage.

[0023] Turn on the automatic gas replenishment system to flush the internal pipelines with SF6 gas and fill the system with SF6 gas to reduce the leakage.

[0024] The micro-leakage system releases gas to the random leak system based on the gas leakage rate set by the control module;

[0025] The inner experimental chamber of the random leakage system can open the solenoid valve on the leakage hole corresponding to the leakage target location point set by the control module;

[0026] Regularly check the SF6 gas content inside the trace leakage system, and the automatic gas replenishment system replenishes SF6 gas in a timely manner when the SF6 gas inside the trace leakage system is depleted;

[0027] The sensitivity assessment process includes the following sub-steps:

[0028] Set the leakage rate error threshold and the leakage target location error threshold;

[0029] The gas leakage rate and leakage target location of the inner experimental chamber are displayed, and the leakage rate error and leakage target location error are calculated respectively based on the gas leakage rate and leakage target location measured by the SF6 infrared imaging leak detector in the inner experimental chamber.

[0030] Compare the leakage rate error with the leakage rate error threshold, and compare the leakage target location error with the leakage target location error threshold; if the leakage rate error ≤ the leakage rate error threshold and the leakage target location error ≤ the leakage target location error threshold, then the sensitivity is high; otherwise, the sensitivity is low.

[0031] The beneficial effects of the present invention are as follows:

[0032] This invention proposes an imaging sensitivity evaluation device and method for an SF6 infrared imaging leak detector. An automatic gas replenishment system is set up to replenish SF6 gas in the micro-leakage system when it is depleted. The micro-leakage system provides leak gas to the random leakage system, with the amount adjusted according to the gas leakage rate. The random leakage system utilizes the pressure difference between the inner and outer experimental chambers, and the micro-leakage system simulates an SF6 gas leak scenario based on the inner experimental chamber 7. The error evaluation system compares the set gas leakage rate and leak target location obtained from the random leakage system with the results measured by the SF6 infrared imaging leak detector to be evaluated, thus assessing the sensitivity of the SF6 infrared imaging leak detector. As can be seen, this invention can accurately evaluate the sensitivity of the SF6 infrared imaging leak detector by addressing the problem of focal plane imager drift after long-term frequent operation, which leads to a significant decrease in imaging sensitivity. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an overall structural diagram of an embodiment of the present invention.

[0035] Figure 2 This is a structural diagram of the micro-leakage system according to an embodiment of the present invention;

[0036] Figure 3 This is a structural diagram of the random leakage system according to an embodiment of the present invention.

[0037] In the diagram, 1. Stepper motor; 2. Lead screw; 3. Piston; 4. Metering cylinder; 5. Air pipe; 6. Outer experimental chamber; 7. Inner experimental chamber; 8. Leakage hole; 9. Connecting strip; 10. Two-way solenoid valve. Detailed Implementation

[0038] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] like Figure 1 The image shown is an embodiment of the present invention of an SF6 infrared imaging leak detector imaging sensitivity evaluation device, including an SF6 infrared imaging leak detector to be evaluated; it also includes a control module, a leak source, an automatic gas replenishment system and an error evaluation system; the leak source includes a micro-leakage system and a random leakage system;

[0043] The control module is used to set the gas leakage rate and the target location of the leak, and also to acquire the gas leakage rate and the target location of the leak measured by the SF6 infrared imaging leak detector.

[0044] The micro-leakage system can release a standard trace amount of SF6 gas into a random leak system according to the gas leak rate set by the control module, and the released gas flow rate is continuously adjustable. The micro-leakage system is electrically connected to the control module. Figure 2As shown, the micro-leakage system includes a booster. The booster includes a stepper motor 1, a lead screw 2, a piston 3, and a metering cylinder 4. The stepper motor 1 is connected to the piston 3 via the lead screw 2. The piston 3 is mounted and moves within the metering cylinder 4. The metering cylinder 4 is pneumatically connected to a two-way solenoid valve 10.

[0045] Stepper motor 1 is an externally driven stepper motor with a voltage of 4.5V and a current of 0.5A. Each step length is 0.0127mm, the motor step angle is 1.8°, and the body length is 34mm. The lead screw 2 has a lead of 0.635mm and a step length of 0.003175mm.

[0046] The two-phase windings of stepper motor 1 use two quasi-sine wave drive currents with a 90° phase difference, which can generate a constant uniform circular pulsating rotating magnetic field inside the motor, thereby achieving uniform step angle subdivision.

[0047] Stepper motor 1 uses the TCM262 stepper motor driver from the German company TRINAMIC.

[0048] The formula for converting the leakage rate L of a micro-leakage system to the stepping frequency f of stepper motor 1 is as follows:

[0049]

[0050] Where: L is the leakage rate, in mm. 3 / s; f is the stepping frequency of stepper motor 1, in Hz; l is the pitch of stepper motor 1, in mm; θ is the basic step angle of stepper motor 1, in °; n is the microstepping of stepper motor 1; r is the radius of quantitative cylinder 4, in mm.

[0051] The internal design of the metering cylinder 4 is a uniform cylindrical cavity, hereinafter referred to as the metering cylinder. Since the basic step angle of the motor is θ = 1.8°, the basic step length of the lead screw 2 is 0.003175 mm, and the subdivision n = 256, the step length of each step after subdivision is l' = 0.003175 / 256 = 0.0000124 mm. Setting the radius of the measuring cylinder to r, the motor lead screw 2 pushes the piston 3 forward at a uniform speed, and the volume of gas leaked in each step is...

[0052] V=l'πr 2 (2)

[0053] If the metering cylinder radius is large, the volume of leakage at each step will be large, making it difficult to control the minimum leakage rate. Therefore, the metering cylinder radius should be smaller. If the radius is too small, the length of the metering cylinder must be increased to meet the volume requirements. An excessively long metering cylinder will increase the difficulty of manufacturing. Therefore, a suitable metering cylinder radius is designed as r = 10 mm, and the length as l0 = 150 mm.

[0054] When the metering cylinder is filled with gas, and the output leakage rate is L0, the time required for the gas to be exhausted is:

[0055] t=l0πr 2 / 1000 / L0 (3)

[0056] If the output leakage rate L0 is 0.1 × 10 -3 mL / s, substituting into equation (3), we can obtain that the time required for gas depletion is 1963.5 min; if the output leakage rate L0 is 100.0 × 10 -3 mL / s, substituting into equation (3), we can obtain that the time required for the gas to be exhausted is 1.96 min; that is, for the maximum leakage rate, the gas in the metering cylinder can be used for nearly 2 minutes to meet the needs of at least one experiment.

[0057] If the gas in the metering cylinder leaks due to sealing problems, it will affect the actual SF6 gas leakage rate at the leak outlet, resulting in errors. Therefore, the metering cylinder and piston 3 should maintain good sealing.

[0058] like Figure 3 As shown, the random leakage system includes an outer experimental chamber 6 and an inner experimental chamber 7. The inner experimental chamber 7 is fixedly installed inside the outer experimental chamber 6. The outer experimental chamber 6 is used to receive SF6 gas released by the micro-leakage system. The inner experimental chamber 7 has several leakage holes 8 on its four sides; each leakage hole 8 is equipped with a solenoid valve. The leakage target location point is one or more of the leakage holes 8. The inner experimental chamber 7 can open the solenoid valve on the leakage hole 8 corresponding to the leakage target location point set by the control module. The outer experimental chamber 6 is equipped with an exhaust solenoid valve. The gas path of the micro-leakage system is connected to a bidirectional solenoid valve 10. The gas path of the bidirectional solenoid valve 10 is connected to the interior of the outer experimental chamber 6 and electrically connected to the control module. The random leakage system includes a multi-channel parallel output independent solenoid valve control unit. The independent solenoid valve control unit is connected to several solenoid valves. The independent solenoid valve control unit is connected to the controller module. The leakage nozzle of the solenoid valve adopts a cross-shaped rubber opening design. The function of the exhaust solenoid valve is as follows: When the booster is fully charged with gas to a pressure of two atmospheres, and all other solenoid valves are closed, the exhaust solenoid valve is opened first and held for one second to balance the gas pressure inside the booster, the gas pressure inside the outer experimental chamber 6, and the external atmospheric pressure. Controlling one or more solenoid valves independently controls a corresponding number of leakage release ports, enabling the release of SF6 gas from any one or several ports, thereby simulating the SF6 gas leakage fault state of on-site electrical equipment. Four connecting strips 9 are fixedly installed between the four surfaces of the outer experimental chamber 6 and the inner experimental chamber 7.

[0059] An automatic gas replenishment system is used to replenish SF6 gas in a timely manner when the SF6 gas inside the micro-leakage system is depleted. The automatic gas replenishment system includes a pressure reducing valve, a three-way solenoid valve, and an SF6 cylinder. The pressure reducing valve is connected to one switch of the three-way solenoid valve and the SF6 cylinder via a gas circuit. One switch of the three-way solenoid valve is connected to the output terminal of the micro-leakage system. The pressure reducing valve outputs SF6 gas at a relative pressure of 0.1 MPa. When the three-way solenoid valve is opened, stepper motor 1 pulls piston 3 back by rotating in the reverse direction until the metering cylinder is full of SF6 gas. Then, the gas replenishment solenoid valve is closed. At this point, the absolute pressure of the gas inside the booster is two atmospheres. The three-way solenoid valve is installed to prevent SF6 gas from entering the metering cylinder when the three-way solenoid valve is closed, which would cause the gas pressure in the metering cylinder and pipeline to exceed atmospheric pressure, thus affecting the accuracy range of the leakage rate.

[0060] The error assessment system is used to display the gas leakage rate of the inner experimental chamber 7 and the position of the leakage target point corresponding to the leakage hole 8. Based on the gas leakage rate and leakage target point measured by the SF6 infrared imaging leak detector obtained by the control module, the leakage rate error and leakage target position error are calculated respectively.

[0061] The control module is connected to both the error assessment system and the automatic air replenishment system. The control module is a tablet computer with a touchscreen.

[0062] A method for evaluating the imaging sensitivity of an SF6 infrared imaging leak detector, including experimental steps and sensitivity evaluation steps;

[0063] The experimental procedure includes the following sub-steps:

[0064] The gas leakage rate is set through the control module, and a leakage hole 8 is selected as the target leakage location.

[0065] Open the three-way solenoid valve of the automatic gas replenishment system, flush the internal pipeline with SF6 gas, and fill the micro-leakage system with SF6 gas, that is, fill the metering cylinder 4 with SF6 gas.

[0066] The micro-leakage system releases gas to the random leak system according to the gas leakage rate set by the control module; the two-way solenoid valve 10 is opened, and the exhaust solenoid valve is opened and maintained for one second to balance the gas pressure inside the booster, the gas pressure inside the outer experimental chamber 6 and the external atmospheric pressure. The stepper motor 1 controls the lead screw 2 to push the piston 3 according to the gas leakage rate.

[0067] The inner experimental chamber 7 of the random leakage system can open the solenoid valve on the leakage hole 8 corresponding to the leakage target location set by the control module; due to the pressure difference between the inner experimental chamber 7 and the outer experimental chamber 6, the inner experimental chamber 7 can simulate the scenario of SF6 gas leakage.

[0068] Regularly check the SF6 gas content inside the trace leakage system, and the automatic gas replenishment system replenishes SF6 gas in a timely manner when the SF6 gas inside the trace leakage system is depleted;

[0069] The sensitivity assessment process includes the following sub-steps:

[0070] Set the leakage rate error threshold and the leakage target location error threshold;

[0071] The gas leakage rate and leakage target location of the inner experimental chamber 7 are displayed, and the leakage rate error and leakage target location error are calculated respectively based on the gas leakage rate and leakage target location measured by the SF6 infrared imaging leak detector in the inner experimental chamber 7.

[0072] Compare the leakage rate error with the leakage rate error threshold, and compare the leakage target location error with the leakage target location error threshold; if the leakage rate error ≤ the leakage rate error threshold and the leakage target location error ≤ the leakage target location error threshold, then the sensitivity is high; otherwise, the sensitivity is low.

[0073] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall be within the protection scope of the present invention.

Claims

1. An imaging sensitivity evaluation device for an SF6 infrared imaging leak detector, comprising an SF6 infrared imaging leak detector to be evaluated; characterized in that: It also includes a control module, a leak source, an automatic gas replenishment system, and an error assessment system; the leak source includes a trace leak system and a random leak system. The control module is used to set the gas leakage rate and the target leakage location, and also to acquire the gas leakage rate and the target leakage location measured by the SF6 infrared imaging leak detector. The micro-leakage system can release a standard trace amount of SF6 gas to the random leak system according to the gas leakage rate set by the control module, and the released gas flow rate is continuously adjustable; the micro-leakage system is electrically connected to the control module. The random leakage system includes an outer experimental chamber and an inner experimental chamber. The inner experimental chamber is fixedly installed inside the outer experimental chamber. The outer experimental chamber is used to receive SF6 gas released by the micro-leakage system. The inner experimental chamber has several leakage holes on its four sides. Each leakage hole is equipped with a solenoid valve. The leakage target location is one or more of the leakage holes. The inner experimental chamber can open the solenoid valve on the leakage hole corresponding to the leakage target location set by the control module. The outer experimental chamber is equipped with an exhaust solenoid valve. The gas path of the micro-leakage system is connected to a bidirectional solenoid valve. The gas path of the bidirectional solenoid valve is connected to the interior of the outer experimental chamber and electrically connected to the control module. The automatic gas replenishment system is used to replenish SF6 gas in a timely manner when the SF6 gas inside the micro-leakage system runs out; The error assessment system is used to display the gas leakage rate of the inner experimental chamber and the position of the leak hole corresponding to the leak target location. Based on the gas leakage rate and leak target location obtained by the control module from the SF6 infrared imaging leak detector, the leakage rate error and the leak target location error are calculated respectively. The control module is connected to the error assessment system and the automatic air replenishment system, respectively.

2. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 1, characterized in that: The micro-leakage system includes a booster; the booster includes a stepper motor, a lead screw, a piston, and a metering cylinder; the stepper motor is connected to the piston via the lead screw; the piston is installed inside the metering cylinder and moves; the metering cylinder is connected to a two-way solenoid valve via an air circuit.

3. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 2, characterized in that: The stepper motor is an externally driven stepper motor with a voltage of 4.5V and a current of 0.5A. Each step length is 0.0127mm, the motor step angle is 1.8°, the body length is 34mm, the lead screw pitch is 0.635mm, and the step length is 0.003175mm.

4. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 2, characterized in that: The internal structure of the metering cylinder is designed as a uniform cylindrical cavity.

5. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 1, characterized in that: The automatic gas replenishment system includes a pressure reducing valve, a three-way solenoid valve, and an SF6 cylinder; the pressure reducing valve is connected to one switch of the three-way solenoid valve and the SF6 cylinder via a gas circuit; one switch of the three-way solenoid valve is connected to the output terminal of the micro-leakage system.

6. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 1, characterized in that: The control module is a tablet computer with a touch screen.

7. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 1, characterized in that: The random leakage system includes an independent solenoid valve control unit with multiple parallel outputs; the independent solenoid valve control unit is connected to several solenoid valves; the independent solenoid valve control unit is connected to a controller module.

8. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 7, characterized in that: The leakage nozzle of the solenoid valve adopts a cross-shaped rubber opening design.

9. The imaging sensitivity evaluation device for an SF6 infrared imaging leak detector according to claim 1, characterized in that: Four connecting strips are fixedly installed between the four surfaces of the outer and inner experimental chambers.

10. A method for evaluating the imaging sensitivity of an SF6 infrared imaging leak detector using the imaging sensitivity evaluation device according to any one of claims 1-9, characterized in that: This includes experimental procedures and sensitivity assessment procedures; The experimental procedure includes the following sub-steps: The gas leakage rate is set through the control module, and a leak hole is selected as the target location for leakage. Turn on the automatic gas replenishment system to flush the internal pipelines with SF6 gas and fill the system with SF6 gas to reduce the leakage. The micro-leakage system releases gas to the random leak system based on the gas leakage rate set by the control module; The inner experimental chamber of the random leakage system can open the solenoid valve on the leakage hole corresponding to the leakage target location point set by the control module; Regularly check the SF6 gas content inside the trace leakage system, and the automatic gas replenishment system replenishes SF6 gas in a timely manner when the SF6 gas inside the trace leakage system is used up. The sensitivity assessment process includes the following sub-steps: Set the leakage rate error threshold and the leakage target location error threshold; The gas leakage rate and leakage target location of the inner experimental chamber are displayed, and the leakage rate error and leakage target location error are calculated respectively based on the gas leakage rate and leakage target location measured by the SF6 infrared imaging leak detector in the inner experimental chamber. Compare the leakage rate error with the leakage rate error threshold, and compare the leakage target location error with the leakage target location error threshold; if the leakage rate error ≤ the leakage rate error threshold and the leakage target location error ≤ the leakage target location error threshold, then the sensitivity is high; otherwise, the sensitivity is low.

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