A gas standard automatic switching device

Abstract

The utility model provides a kind of standard gas automatic switching device, including controller and multiple standard gas cylinders;The mouth of each standard gas cylinder is equipped with a solenoid valve group, and each standard gas cylinder is connected with the standard gas port of at least one transformer oil gas on-line monitoring equipment through corresponding solenoid valve group;The controller is used to control each solenoid valve group, to switch any one or two standard gas cylinders and each transformer oil gas on-line monitoring equipment communication;The standard gas automatic switching device of the application can be docked with transformer oil gas on-line monitoring equipment, to automatically switch standard gas cylinder when on-site calibration of transformer oil gas on-line monitoring equipment is carried out, to automatically realize the multipoint calibration of transformer oil gas on-line monitoring equipment, so as to save a lot of artificial and time cost, improve the calibration efficiency of transformer oil gas on-line monitoring equipment.

Description

Technical Field

[0001] This utility model belongs to the technical field of online monitoring equipment calibration for gas in transformer oil, and specifically relates to an automatic standard gas switching device. Background Technology

[0002] Online monitoring of transformer oil is crucial for diagnosing internal transformer faults. During transformer operation, online gas monitoring equipment can analyze the composition and concentration changes of gases in the transformer oil in real time, enabling timely detection of internal transformer faults (such as discharge or overheating), thereby ensuring the safe operation of the power system.

[0003] However, after a period of use, online gas monitoring equipment in transformer oil may experience drift errors due to aging or other reasons. Regular calibration of the online gas monitoring equipment in transformer oil is necessary to ensure its accuracy.

[0004] Currently, there are many existing calibration devices for online monitoring equipment of gas in transformer oil. For example, the invention patent with application number 2023116096380 discloses a device for calibrating the accuracy of online monitoring of dissolved gases in oil. This device is formed by adding a calibration unit to the existing online monitoring equipment of gas in transformer oil. The calibration unit includes a standard gas cylinder and a second quantitative unit. During calibration, the second quantitative unit is used to connect to the standard gas cylinder to obtain standard gas with a known concentration. The push unit (part of the oil-gas separation unit) in the online monitoring equipment of gas in transformer oil delivers the standard gas in the second quantitative unit to the gas separation unit for standard gas separation. The gas components separated from the standard gas are then sent to the gas detection unit for detection to obtain the concentration of each gas component in the standard gas. By comparing the measured data of the standard gas with the actual data, the on-site calibration of the online monitoring equipment of gas in transformer oil is completed. However, in order to ensure the accuracy of equipment calibration, it is often necessary to send standard gases of different concentrations into the online gas monitoring equipment in transformer oil for online detection. The calibration unit mentioned above only has one standard gas cylinder, and it is necessary to manually replace the standard gas cylinders of different concentrations to switch the standard gas in order to perform multi-point calibration, which has the defect of low switching efficiency. In addition, the device can only calibrate a specific single device and cannot meet the batch calibration of multiple devices. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an automatic standard gas switching device that can be connected to the online gas monitoring equipment in transformer oil, so as to automatically switch the standard gas cylinder when the online gas monitoring equipment in transformer oil is being calibrated on site, thereby saving a lot of labor and time costs and improving the calibration efficiency of the online gas monitoring equipment in transformer oil.

[0006] To achieve the above and other related objectives, this utility model provides an automatic standard gas switching device, including a controller and multiple standard gas cylinders. Each standard gas cylinder has a solenoid valve assembly installed at its opening, and each standard gas cylinder is connected to the standard gas port of at least one online transformer oil gas monitoring device via a corresponding solenoid valve assembly. The controller controls each solenoid valve assembly to switch any one or two standard gas cylinders connected to each online transformer oil gas monitoring device. This automatic standard gas switching device can interface with online transformer oil gas monitoring devices to automatically switch standard gas cylinders during on-site calibration of the online transformer oil gas monitoring devices, thereby automatically achieving multi-point calibration of the online transformer oil gas monitoring devices, saving significant labor and time costs, and improving the calibration efficiency of the online transformer oil gas monitoring devices.

[0007] Preferably, a flow controller is provided between the standard gas cylinder and the corresponding solenoid valve assembly.

[0008] Preferably, a miniature eddy current generator is provided between the standard gas cylinder and the corresponding solenoid valve assembly.

[0009] Preferably, the standard gas automatic switching device includes a carrier gas cylinder, which is connected to the carrier gas port of each transformer oil gas online monitoring device via a solenoid valve group.

[0010] Preferably, a pressure reducing valve is provided between each gas cylinder and the corresponding solenoid valve assembly.

[0011] Preferably, the solenoid valve group includes multiple solenoid valves arranged in parallel; the air inlets of each solenoid valve are arranged in parallel at the mouth of the corresponding gas cylinder, and the air outlets of each solenoid valve are respectively connected to different online monitoring devices for gas in transformer oil.

[0012] Preferably, the solenoid valve assembly includes a pneumatic multi-port, which includes multiple interconnected multi-port interfaces; one multi-port interface of the pneumatic multi-port is connected to the cylinder opening of a corresponding gas cylinder, and the remaining multi-port interfaces of the pneumatic multi-port are used to install solenoid valves.

[0013] Preferably, the automatic standard gas switching device includes a standard gas main pipe with the same number as the online gas monitoring devices in the transformer oil; the outlet of each standard gas main pipe is connected to the standard gas port of each online gas monitoring device in the transformer oil in a one-to-one correspondence; each solenoid valve group at the standard gas cylinder has a solenoid valve outlet connected to the same standard gas main pipe; the standard gas main pipe is equipped with a pressure detector and a main pipe control valve.

[0014] Preferably, the automatic standard gas switching device includes a cabinet, and the cabinet is provided with a standard gas cylinder rack; the standard gas cylinder rack includes a plurality of storage seats arranged at intervals from top to bottom, and the storage seats have storage cavities for accommodating standard gas cylinders; the standard gas cylinders are detachably installed in the storage cavities.

[0015] Preferably, the standard gas automatic switching device includes a control touch screen connected to the controller.

[0016] As described above, the automatic standard gas switching device of this utility model has the following beneficial effects:

[0017] 1) The standard gas automatic switching device of this application can be connected to the online gas monitoring equipment in transformer oil to automatically switch the standard gas cylinder when the online gas monitoring equipment in transformer oil is being calibrated on site, so as to automatically realize multi-point calibration of the online gas monitoring equipment in transformer oil, thereby saving a lot of labor and time costs and improving the calibration efficiency of the online gas monitoring equipment in transformer oil.

[0018] 2) The standard gas automatic switching device of this application can be connected to multiple online gas monitoring devices in transformer oil to realize batch verification of multiple online gas monitoring devices in transformer oil. Compared with the traditional scheme of sequentially verifying multiple online gas monitoring devices in transformer oil, the batch verification scheme of this application is faster and more convenient, and significantly reduces the verification time.

[0019] 3) Installing a flow controller between the standard gas cylinder and the corresponding solenoid valve group is beneficial for mixing two concentrations of standard gas into various concentrations by controlling two flow controllers, so as to flexibly adapt to different calibration requirements, thereby reducing the dependence on multiple standard gas cylinders of different concentrations and effectively reducing the number of standard gas cylinders required.

[0020] 4) By arranging the standard gas cylinders neatly in a cabinet, not only is space saved and aesthetics improved, but it also facilitates unified management and maintenance, avoids the problem of incorrect standard gas supply caused by confusion of standard gas cylinders, and ensures the smooth progress of equipment calibration. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the automatic gas switching device from a first-person perspective (i.e., a view from the left front).

[0022] Figure 2 This is a stereoscopic view of the automatic gas switching device from a second perspective (i.e., a view from the left rear).

[0023] Figure 3 This is a diagram showing the layout of the standard gas pipeline inside the automatic standard gas switching device.

[0024] Figure 4 This is a diagram showing the layout of the carrier gas pipeline inside the standard gas automatic switching device.

[0025] Figure 5 This is a 3D view of the pneumatic multi-port valve in a solenoid valve assembly.

[0026] Figure 6 This is an internal cross-sectional view of the pneumatic multi-port valve.

[0027] Explanation of reference numerals in the attached figures

[0028] Standard gas cylinder 1, solenoid valve assembly 2, solenoid valve 21, gas multi-port 22, multi-port interface 221, spare interface 222, pressure reducing valve 3, carrier gas cylinder 4, standard gas main pipe 5, pressure detector 6, main pipe control valve 7, cabinet 8, standard gas cylinder rack 81, standard gas calibration port 8a, carrier gas calibration port 8b, shelf 811, vertical partition 82, fan 83, casters 84, controller 9. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0030] Please see Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0031] Currently, online gas monitoring equipment in transformer oil is often used to analyze the changes in the composition and concentration of gases in transformer oil in real time, so as to detect latent faults inside the transformer in a timely manner and provide early warnings, thereby ensuring the safe operation of the power system.

[0032] However, after a period of use, online gas monitoring equipment in transformer oil may experience drift errors due to aging and other reasons. Regular calibration of the equipment is necessary to ensure its accuracy. During calibration, standard gases of different concentrations need to be sequentially input into the monitoring equipment for detection, with the concentration range increasing from low to high to verify the minimum and maximum detection concentrations. Currently, switching standard gases requires manual replacement of standard gas cylinders with different concentrations, resulting in low efficiency and high labor intensity.

[0033] Based on this, this application provides an automatic standard gas switching device, which can automatically switch between providing standard gases of different concentrations. For example... Figure 1 and Figure 2 As shown, the automatic standard gas switching device includes a controller 9 and multiple standard gas cylinders 1. Each standard gas cylinder 1 has a solenoid valve assembly 2 connected to its opening, and each standard gas cylinder 1 is connected to the standard gas port of at least one online transformer oil gas monitoring device via the corresponding solenoid valve assembly 2. The controller 9 controls each solenoid valve assembly 2 to switch the connection between any one or two standard gas cylinders 1 and each online transformer oil gas monitoring device (not shown in the figure), thereby automatically providing different concentrations of standard gas to all online transformer oil gas monitoring devices and automatically achieving multi-point calibration of each online transformer oil gas monitoring device. In this embodiment, the controller 9 is preferably a PLC controller.

[0034] Understandably, when there is only one online monitoring device for gas in transformer oil, each standard gas cylinder 1 is connected in parallel at the standard gas port of the online monitoring device. This facilitates switching any one or two standard gas cylinders 1 with the online monitoring device via the solenoid valve group 2, automatically providing different concentrations of standard gas to the online monitoring device. When there are multiple online monitoring devices for gas in transformer oil, each standard gas cylinder 1 is connected in parallel at the standard gas port of each online monitoring device. This facilitates switching any one or two standard gas cylinders 1 with each online monitoring device via the solenoid valve group 2, automatically providing different concentrations of standard gas to all online monitoring devices, enabling batch calibration of multiple devices. The standard gas concentration input to each online monitoring device can be the same or different each time, without limitation. To reduce control difficulty, it is preferable that the standard gas concentration input to each online monitoring device is the same each time.

[0035] It should be noted that the standard gas cylinder 1 contains standard gas with known concentrations of each component, and the components and concentrations contained in different standard gas cylinders 1 are different.

[0036] Furthermore, such as Figure 1 As shown, a pressure reducing valve 3 is provided between the standard gas cylinder 1 and the corresponding solenoid valve group to reduce the pressure of the fluid output from the standard gas cylinder 1 to a safe pressure range, thereby preventing damage to critical components in the online gas monitoring equipment for transformer oil due to high pressure. In this embodiment, the safe pressure range is 0.2 MPa to 0.4 MPa.

[0037] In an optional embodiment, a flow controller is provided between the standard gas cylinder 1 and the corresponding solenoid valve group 2. The flow controller can detect and control the flow rate output by the corresponding standard gas cylinder 1 so as to mix the two concentrations of standard gas output from any two standard gas cylinders 1 into standard gas of various different concentrations, thereby flexibly meeting different calibration requirements.

[0038] In an optional embodiment, a miniature eddy current generator is provided between the standard gas cylinder 1 and the corresponding solenoid valve group 2 so that after the standard gas switching is completed, the miniature eddy current generator can be used to guide the switched standard gas to form a eddy current during the flow process. When the fluid in the form of eddy current flows through the pipeline, it can remove the residual standard gas before switching in the pipeline, improve the pipeline flushing effect, and avoid the residual standard gas from affecting the detection results of the switched standard gas.

[0039] In this embodiment, for the convenience of centralized management and storage of standard gas cylinder 1, such as Figure 1 and Figure 2 As shown, the standard gas automatic switching device includes a cabinet 8, which is used to house and fix key components such as the standard gas cylinder 1, the solenoid valve group 2, and the controller 9.

[0040] Specifically, such as Figure 1 As shown, the cabinet 8 is equipped with a standard gas cylinder arrangement rack 81; the standard gas cylinder arrangement rack 81 includes multiple storage seats 811 spaced apart from top to bottom. Each storage seat 811 has a storage cavity for accommodating the standard gas cylinder 1, and the standard gas cylinder 1 can be detachably installed in the storage cavity by means of straps or other structures. In this way, all the standard gas cylinders 1 can be neatly arranged in one cabinet 8, which not only saves space and improves aesthetics, but also facilitates unified management and maintenance, and avoids the problem of incorrect standard gas supply caused by confusion of the standard gas cylinders 1.

[0041] It should be noted that the storage seat 811 is provided with one or more storage cavities. When the storage seat 811 is provided with multiple storage cavities, each storage cavity is spaced apart along the length direction of the storage seat 811.

[0042] Understandably, the cabinet 8 needs to be equipped with a standard gas cylinder replacement port that exposes the entire standard gas cylinder rack 81, so as to facilitate the replacement of standard gas cylinder 1.

[0043] In a preferred embodiment, to improve the aesthetics of the interior of cabinet 8, such as... Figure 1 and Figure 2As shown, a vertical partition 82 is provided inside the cabinet 8, which divides the internal space of the cabinet into two independent spaces: Space 1 and Space 2. The standard gas cylinder rack 81 is installed in Space 1, and the standard gas cylinder replacement port is located on the side away from the vertical partition 82. The solenoid valve group 2, controller 9, and electrical components such as air switches and terminals connected to each standard gas cylinder 1 are all located in Space 2.

[0044] Specifically, such as Figure 2 As shown, the solenoid valve groups 2 connected to each standard gas cylinder 1 are all installed on the vertical partition 82, and the installation positions correspond one-to-one with the placement positions of the corresponding standard gas cylinder 1. This results in the solenoid valve groups 2 connected to each standard gas cylinder 1 being arranged in a matrix on the vertical partition 82, which not only improves the overall aesthetics but also reduces the probability of incorrectly connecting the solenoid valve groups 2 when replacing the standard gas cylinder 1.

[0045] Furthermore, current online gas monitoring equipment for transformer oil primarily employs photoacoustic spectroscopy or gas chromatography for gas detection. When using photoacoustic spectroscopy, carrier gas is needed to purge any residual gas from previous tests to prevent it from affecting the current test results. When using gas chromatography, not only is purging of residual gas from previous tests necessary, but the carrier gas also needs to be used as a power supply gas to propel the standard gas entering the online monitoring equipment for detection. Therefore, online gas monitoring equipment for transformer oil requires an additional carrier gas supply during operation.

[0046] Based on this, such as Figure 1 and Figure 2 As shown, this application configures a large carrier gas cylinder 4 in the cabinet 8. The carrier gas cylinder 4 is connected to the carrier gas port of each transformer oil gas online monitoring device through the solenoid valve group 2. The carrier gas cylinder 4 is also located in space one and is located next to the standard gas cylinder side rack 81.

[0047] To ensure the stability of the carrier gas cylinder 4, the carrier gas cylinder 4 is detachably fixed to the standard gas cylinder rack 81 by means of straps or other structures.

[0048] It should be noted that, in order to facilitate the replacement of carrier gas cylinder 4, a carrier gas cylinder replacement port that exposes the entire carrier gas cylinder 4 should also be provided on the cabinet 8; the carrier gas cylinder replacement port and the standard gas cylinder replacement port can be located on the same side wall or different side walls of the cabinet 8, and there is no limitation on this. Figure 1 As shown, in this embodiment, the carrier gas cylinder replacement port and the standard gas cylinder replacement port are located on different side walls of the cabinet 8, and the carrier gas cylinder replacement port is perpendicular to the standard gas cylinder replacement port.

[0049] At this time, as Figure 2As shown, the solenoid valve group 2 connected to the carrier gas cylinder 4 is also located in space two and installed on the vertical partition 82; the installation position of the solenoid valve group 2 connected to the carrier gas cylinder 4 corresponds one-to-one with the placement position of the corresponding carrier gas cylinder 4; and the power distribution control box composed of the controller 9 and electrical components such as air switches and terminals is placed under the solenoid valve group 2 connected to the carrier gas cylinder 4, which improves the compactness and aesthetics of the internal component arrangement of the cabinet 8.

[0050] Of course, such as Figure 1 As shown, a pressure reducing valve 3 is also provided between the carrier gas cylinder 4 and the corresponding solenoid valve group 2 to ensure the operational safety of the online monitoring equipment for gas in transformer oil.

[0051] Furthermore, such as Figure 2 As shown, a fan 83 is also installed in the space of the cabinet 8 to provide cooling.

[0052] In a preferred embodiment, such as Figure 1 As shown, the side wall of the cabinet 8 is provided with multiple calibration ports 8a for standard gas. Each standard gas cylinder 1 is connected to each calibration port 8a via a corresponding solenoid valve group 2, which facilitates switching any one or two standard gas cylinders 1 to be connected to each calibration port by controlling the solenoid valve group 2. In addition, the calibration ports 8a are used to connect to the calibration ports of the online gas monitoring equipment in transformer oil, and different calibration ports 8a are used to connect to different online gas monitoring equipment in transformer oil. Since the connecting pipes between the calibration ports 8a and each standard gas cylinder 1 are built into the cabinet 8, the problem of messy pipes caused by numerous external pipes is effectively overcome, and the overall aesthetics are improved. At the same time, the risk of pipe confusion and incorrect connection is also reduced.

[0053] Similarly, to further reduce exposed pipes and lower the risk of incorrect pipe connections, such as Figure 1 As shown, multiple carrier gas calibration ports 8b (not shown in the figure) can also be provided on the side wall of the cabinet 8. The number of carrier gas calibration ports 8b is the same as the number of calibration ports 8a. The carrier gas cylinder 4 is connected to each carrier gas calibration port 8b through the corresponding solenoid valve group 2, so as to facilitate the control of the on / off of the carrier gas cylinder 4 and each carrier gas calibration port 8b by controlling the solenoid valve group 2. In addition, the carrier gas calibration port 8b is used to connect to the carrier gas port of the online gas monitoring equipment in transformer oil, and different carrier gas calibration ports 8b are used to connect to different online gas monitoring equipment in transformer oil.

[0054] To facilitate understanding of the layout principles of the standard gas pipelines and carrier gas pipelines within rack 8, the following is a combination of... Figure 3 and Figure 4 To elaborate.

[0055] like Figure 3As shown, the solenoid valve group 2 connected to the standard gas cylinder 1 includes multiple solenoid valves 21 arranged in parallel, and the number of solenoid valves 21 is the same as the number of standard gas calibration ports 8a; the air inlets of each solenoid valve 21 in the same solenoid valve group 2 are arranged in parallel at the bottle mouth of the corresponding standard gas cylinder 1, and the air outlets of each solenoid valve 21 are respectively connected to different standard gas calibration ports 8a; in this way, it can be ensured that the standard gas of each standard gas cylinder 1 can be delivered to different standard gas calibration ports 8a.

[0056] Specifically, such as Figure 3 As shown, the cabinet 8 is equipped with multiple main gas pipes 5 that are connected one-to-one with each calibration port 8a of the calibration gas. Furthermore, the outlet of a solenoid valve 21 in the solenoid valve assembly 2 at each calibration gas cylinder 1 is connected to the same main gas pipe 5.

[0057] In addition, to facilitate the testing of the airtightness of each standard gas pipeline, a main control valve 7 can be installed on each standard gas main pipe 5. In this way, the airtightness can be tested by means of soap bubbles, simply by inputting the standard gas into the standard gas pipeline and closing the main control valve 7 and the solenoid valve 21 connected to each standard gas cylinder 1.

[0058] It is understood that the main control valve 7 can be an on / off valve or a proportional regulating valve, and there is no limitation on this; in this embodiment, the main control valve 7 is preferably set as an on / off valve.

[0059] For ease of management, each main control valve 7 can be integrated and installed on the same connecting block, and the connecting block integrating each main control valve 7 can be installed on the vertical partition 82; the connecting block only serves a fixing function.

[0060] Alternatively, a pressure detector 6 can be added to the main calibration gas line 5 to determine if there is a leak by measuring the pressure changes in the detector. The main line control valve 7 is located between the pressure detector 6 and the corresponding calibration gas port 8a, and the pressure detector 6 is a pressure sensor or pressure transmitter.

[0061] Similarly, each pressure detector 6 can be integrated and installed on the same connecting block, which is then installed on the vertical partition 82 via the connecting block. The connecting block also only serves a fixing function.

[0062] like Figure 4 As shown, the solenoid valve group 2 connected to the carrier gas cylinder 4 includes multiple solenoid valves 21 arranged in parallel, and the number of solenoid valves 21 is the same as the number of carrier gas calibration ports 8b. The inlets of each solenoid valve 21 in the solenoid valve group 2 connected to the carrier gas cylinder 4 are arranged in parallel at the cylinder opening, and the outlets of each solenoid valve 21 are respectively connected to each carrier gas calibration port 8b.

[0063] In a preferred embodiment, to reduce the number of connection points in the piping system within the cabinet 8 and lower the complexity of the piping system, such as... Figure 5 and Figure 6 As shown, the solenoid valve assembly 2 includes a pneumatic multi-port 22; wherein the pneumatic multi-port 22 includes multiple interconnected multi-port interfaces 221; wherein one multi-port interface 221 is used to connect to the corresponding standard gas cylinder 1 or carrier gas cylinder 4, and the remaining multi-port interfaces 221 are used to install solenoid valves 21; in this way, multiple solenoid valves 21 in the solenoid valve assembly 2 can be integrated together through the pneumatic multi-port 22, which not only reduces the installation space of the solenoid valve assembly 2, but also facilitates installation and maintenance.

[0064] Optionally, such as Figure 6 As shown, the gas multi-way device 22 also includes a spare interface 222 that communicates with each multi-way device interface 221. In addition to serving as an expansion interface, the spare interface 222 can also act as a filling port to fill the corresponding standard gas cylinder or carrier gas cylinder. When the spare interface 222 is not in use, the spare interface 222 is in a blocked state.

[0065] It is understood that the pneumatic multi-port device 22 can be of various shapes, such as a cuboid or trapezoidal block, and is not limited thereto. In this embodiment, for example... Figure 5 and Figure 6 As shown, the pneumatic multi-port 22 is preferably a cuboid, wherein one multi-port interface 221 is opened on the end face of one end of the cuboid, and the other multi-port interfaces 221 are located on the side wall of the cuboid and are spaced apart along the length of the cuboid; the spare interface 222 is located on the end face of the other end of the cuboid.

[0066] In a preferred embodiment, a control touch screen connected to the controller 9 can be additionally installed on the cabinet 8 to realize human-computer interaction (such as users can input control commands and view status through the control touch screen), thereby facilitating the preparation of target concentration standard gas and dynamic adjustment of standard gas switching order according to user verification needs.

[0067] In a preferred embodiment, the bottom of the cabinet 8 is provided with casters 84 with brakes to facilitate the movement of the entire standard gas automatic switching device.

[0068] Because the standard gas automatic switching device of this application can interface with the online gas monitoring equipment in transformer oil, it automatically switches the standard gas cylinder during on-site calibration of the online gas monitoring equipment in transformer oil. This enables automatic multi-point calibration of the online gas monitoring equipment in transformer oil, saving significant labor and time costs and effectively improving the calibration efficiency. Furthermore, this automatic standard gas switching device can interface with multiple online gas monitoring devices in transformer oil simultaneously, enabling batch calibration of multiple devices and further shortening the calibration time. Furthermore, this application utilizes a vertical partition 82 to divide the cabinet 8 into two independent spaces, Space 1 and Space 2. A standard gas cylinder rack 81 is used to neatly arrange each standard gas cylinder 1 within Space 1 of the cabinet 8, improving aesthetics and facilitating unified management. Additionally, fixing the carrier gas cylinder 4 in the remaining space of Space 1 effectively increases the utilization rate of Space 1. The controller 7 and each solenoid valve group 2 are arranged in Space 2, separating electrical components from the gas cylinders and allowing for the corresponding solenoid valve group 2 positions to be set according to the location of each gas cylinder, improving the aesthetics of the solenoid valve group 2 arrangement and reducing the risk of incorrect connection of the solenoid valve group 2 during gas cylinder replacement. Finally, a standard gas calibration port 8a and a carrier gas calibration port 8b are provided on the outer wall of the cabinet 8 so that all pipelines involved in the automatic standard gas switching device are located inside the cabinet 8, further enhancing aesthetics.

[0069] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0070] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An automatic standard gas switching device, characterized in that, The system includes a controller and multiple standard gas cylinders (1); each standard gas cylinder (1) is equipped with a solenoid valve group (2) at its opening, and each standard gas cylinder (1) is connected to the standard gas port of at least one online gas monitoring device for transformer oil via the corresponding solenoid valve group (2); the controller is used to control each solenoid valve group (2) to switch any one or two standard gas cylinders (1) to be connected to each online gas monitoring device for transformer oil.

2. The standard gas automatic switching device according to claim 1, characterized in that, A flow controller is provided between the standard gas cylinder (1) and the corresponding solenoid valve group (2).

3. The standard gas automatic switching device according to claim 1, characterized in that, A miniature eddy current generator is provided between the standard gas cylinder (1) and the corresponding solenoid valve group (2).

4. The standard gas automatic switching device according to claim 1, characterized in that, The standard gas automatic switching device includes a carrier gas cylinder (3), which is connected to the carrier gas port of each transformer oil gas online monitoring device through a solenoid valve group (2).

5. An automatic standard gas switching device according to any one of claims 1 to 4, characterized in that, Each gas cylinder is connected to its corresponding solenoid valve assembly (2) by a pressure reducing valve (4).

6. The standard gas automatic switching device according to claim 1 or 4, characterized in that, The solenoid valve group (2) includes multiple solenoid valves (21) arranged in parallel; the air inlet of each solenoid valve (21) is arranged in parallel at the mouth of the corresponding gas cylinder, and the air outlet of each solenoid valve (21) is connected to different online monitoring devices for gas in transformer oil.

7. The standard gas automatic switching device according to claim 6, characterized in that, The solenoid valve assembly (2) includes a gas multi-port (22), which includes multiple interconnected multi-port interfaces (221); one multi-port interface (221) of the gas multi-port (22) is connected to the bottle opening of a corresponding gas cylinder, and the remaining multi-port interfaces (221) of the gas multi-port (22) are used to install solenoid valves (21).

8. The standard gas automatic switching device according to claim 6, characterized in that, The automatic standard gas switching device includes a standard gas main pipe (5) with the same number as the online gas monitoring equipment in transformer oil; the outlet of each standard gas main pipe (5) is connected to the standard gas port of each online gas monitoring equipment in transformer oil; the outlet of a solenoid valve (21) in each solenoid valve group (2) at the standard gas cylinder (1) is connected to the same standard gas main pipe (5); the standard gas main pipe (5) is equipped with a pressure detector (6) and a main pipe control valve (7).

9. The standard gas automatic switching device according to claim 1, characterized in that, The automatic standard gas switching device includes a cabinet (8), and the cabinet (8) is provided with a standard gas cylinder rack (81); the standard gas cylinder rack (81) includes a plurality of storage seats (811) spaced apart from top to bottom, and the storage seats have storage cavities for accommodating standard gas cylinders; the standard gas cylinder (1) is detachably installed in the storage cavity.

10. The standard gas automatic switching device according to claim 1, characterized in that, The standard gas automatic switching device includes a control touch screen connected to the controller.

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