High-voltage bushing monitoring device

Abstract

The invention provides a high-voltage bushing monitoring device, and the device comprises an oil-gas separation part which is communicated with the interior of a high-voltage bushing, so as to receive insulating oil in the high-voltage bushing and separate dissolved gas from the insulating oil; the gas detection component is connected with the oil-gas separation component, is positioned on one side far away from the high-voltage bushing, and is used for receiving the dissolved gas separated from the oil-gas separation component and detecting components and corresponding concentrations of the dissolved gas; the problems that in the prior art, a monitoring device of a high-voltage bushing is too large in size, and continuous monitoring cannot be achieved are solved.

Description

Technical Field

[0001] The present invention relates to the field of online monitoring of power equipment status, and in particular to a high-voltage bushing monitoring device. Background Art

[0002] High-voltage bushings, a key component of large power transformers and converter transformers, are characterized by complex structures, hidden faults, low oil consumption, narrow internal space, and a slender shape. While they typically only account for approximately 2% of a transformer's total cost, they are a high-risk component prone to frequent failures in high-voltage transmission and transformation equipment. Statistics show that high-voltage bushing failures account for 20%-35% of all transformer accidents. These failures often develop slowly in the early stages and are difficult to detect. However, once they occur, they can disrupt the high-voltage transmission system, making them difficult to repair or replace while energized and requiring a long recovery period, resulting in significant socioeconomic losses.

[0003] Currently, the mainstream method for assessing the extent of insulation faults within high-voltage bushings relies on monitoring the concentration of specific fault characteristic gases, such as acetylene (C2H2) dissolved in transformer oil. However, in the existing photoacoustic spectroscopy gas detection technology, the oil-gas separation module and the gas detection cell are two independent parts. The oil-gas separation module is used to extract dissolved gases from the oil sample, and then the gas is sent to the gas detection cell via an external air pump for gas concentration detection. The independent separation and detection components make the device bulky as a whole, making it difficult to install directly on the main body or oil inlet of the high-voltage bushing. In addition, the air pump needs to be started at regular intervals to send the gas generated by the oil-gas separation module into the gas detection cell, limiting its real-time monitoring capabilities.

[0004] Therefore, how to develop a monitoring device with a small volume, which can be directly installed on the bushing body and has a long maintenance cycle is an important issue in realizing online monitoring of high-pressure bushing gas. Summary of the Invention

[0005] The main purpose of the present invention is to provide a high-voltage bushing monitoring device to solve the problem that the high-voltage bushing monitoring device in the prior art is too large and cannot achieve continuous monitoring.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, a high-voltage bushing monitoring device is provided, comprising: an oil-gas separation component, the oil-gas separation component being in communication with the interior of the high-voltage bushing to receive insulating oil within the high-voltage bushing and to separate dissolved gas from the insulating oil; and a gas detection component, the gas detection component being connected to the oil-gas separation component and being located on a side away from the high-voltage bushing, for receiving the dissolved gas separated from the oil-gas separation component and detecting the components and corresponding concentrations of the dissolved gas.

[0007] Furthermore, the oil-gas separation component also includes: a connecting piece, in which a first oil storage chamber is provided for connecting to the high-voltage bushing to receive insulating oil from the high-voltage bushing; an oil-gas separation body, which is connected to the connecting piece and is located on a side of the connecting piece away from the high-voltage bushing, and in which a second oil storage chamber communicating with the first oil storage chamber is provided, and an end of the second oil storage chamber away from the first oil storage chamber is communicated with the gas detection component; and an oil-gas separation membrane group, which is arranged in the second oil storage chamber.

[0008] Furthermore, the oil-gas separation membrane group includes: a permeable membrane, which is arranged in the second oil storage chamber to receive the insulating oil in the first oil storage chamber; a support plate, which is arranged in the second oil storage chamber and is located on the side of the permeable membrane close to the gas detection component, and the support plate is provided with filter holes; wherein, an oil-blocking sealing ring is provided between the permeable membrane and the first oil storage chamber, so that the permeable membrane is supported in the second oil storage chamber under the action of the oil-blocking sealing ring and the support plate; a gas sealing ring is provided between the support plate and the gas detection component to prevent the dissolved gas separated from the oil-gas separation membrane group from leaking.

[0009] Furthermore, the material used to make the permeable membrane includes fluoropolymer; and / or the thickness of the permeable membrane is 30 μm to 80 μm; and / or the material used to make the support sheet includes stainless steel; and / or the filter holes are circular holes with a diameter of 0.5 μm to 2 μm; and / or there are multiple filter holes, and the multiple filter holes are spaced apart on the support sheet.

[0010] Furthermore, the gas detection component also includes: a gas detection shell, the gas detection shell includes a first side surface, a second side surface and a third side surface connected in sequence, wherein the first side surface is in contact with the oil-gas separation component, the second side surface is perpendicular to the first side surface, and the third side surface is parallel to the first side surface and is located on the side of the first side surface away from the oil-gas separation component; a gas chamber, the gas chamber is arranged inside the gas detection shell, and is connected to the oil-gas separation membrane group to receive the dissolved gas separated in the oil-gas separation membrane group.

[0011] Furthermore, the gas detection component also includes: a laser light source module, which is connected to the gas chamber to provide a laser light source of a specific wavelength to the gas chamber; a monitoring module, the detection probe of the monitoring module is arranged in the gas chamber to receive and monitor the acoustic wave signal generated after the laser light source irradiates the dissolved gas, and convert the acoustic wave signal into an electrical signal; a control module, which is electrically connected to the laser light source module and the monitoring module to control the working state of the laser light source module, and calculate the corresponding dissolved gas components and corresponding concentrations based on the electrical signal received from the monitoring module.

[0012] Furthermore, the gas detection shell also includes: a laser mounting hole, which is arranged on the second side and connected to the gas chamber to install the laser light source module; and / or an air inlet hole group and an air outlet hole group, which are arranged at intervals on the third side and are both connected to the gas chamber, wherein the air inlet hole group is used to introduce the gas to be purged, and the air outlet hole group is used to discharge the dissolved gas and the purge gas; and / or a monitoring mounting hole, which is located on the third side and connected to the gas chamber to install the monitoring module; and / or an air pressure detection hole, which is located on the third side and connected to the gas chamber, for installing an air pressure sensor to monitor the air pressure changes in the gas chamber; and / or the laser light source module also includes: a laser emitter for generating a laser beam; a laser controller, which is electrically connected to the laser emitter to generate a driving signal to drive the laser emitter to work; a collimator, which is electrically connected to the laser emitter, and the collimator is installed on the gas detection component and arranged toward the gas chamber so that the laser beam generated by the laser emitter is collimated and emitted into the gas chamber.

[0013] Furthermore, the monitoring module also includes: a pad, which is connected to the third side of the gas detection shell, and a pad mounting hole with a diameter larger than the monitoring mounting hole is provided in the pad; a microphone, which is inserted into the pad mounting hole, and the receiving end of the microphone extends into the monitoring mounting hole to receive the sound wave signal from the gas chamber.

[0014] Furthermore, the monitoring module also includes: a signal converter, which is electrically connected to the microphone to receive the electrical signal output from the microphone and convert the electrical signal into a digital signal; a signal amplifier, which is electrically connected to the signal converter to receive the digital signal and amplify the digital signal into an amplified signal; wherein the control module is electrically connected to the signal amplifier to receive and process the amplified signal and calculate the corresponding dissolved gas components and corresponding concentrations.

[0015] Furthermore, the oil-gas separation body is also provided with: an exhaust hole, which is arranged at the top of the oil-gas separation body and is connected to the second oil storage chamber for discharging air in the oil-gas separation body, and a seal is also provided in the exhaust hole to seal the exhaust hole when the high-voltage bushing monitoring device is working; a moisture detection hole, which is connected to the second oil storage chamber, and the high-voltage bushing monitoring device also includes a moisture sensor at least partially installed in the moisture detection hole, and the detection probe of the moisture sensor extends into the second oil storage chamber to detect the moisture content in the insulating oil.

[0016] By applying the technical solution of the present invention, the present invention designs a high-voltage bushing monitoring device as an interconnected oil-gas separation component and a gas detection component, making the entire monitoring device compact and capable of being installed directly in a narrow space near the high-voltage bushing. This reduces the length of the oil pipeline and reduces the risk of leakage. Furthermore, by first separating the dissolved gas in the insulating oil and then performing gas concentration detection, interference with the test results by the oil sample is avoided, thereby improving detection accuracy. Furthermore, because the gas detection component is tightly coupled with the oil-gas separation component, losses and contamination during gas transfer are reduced, ensuring the reliability of the test results. Therefore, the monitoring device of the present invention can continuously and in real time monitor changes in gas concentration within the high-voltage bushing, promptly detecting potential insulation faults and effectively resolving the problem of high-voltage bushing monitoring devices in the prior art being too large and unable to achieve continuous monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It shows a schematic diagram of the overall structure of an embodiment of a high-voltage bushing monitoring device according to the present invention;

[0019] Figure 2 An exploded view of an oil-gas separation component of a high-voltage bushing monitoring device according to the present invention is shown;

[0020] Figure 3 It shows a schematic diagram of the overall structure of the oil-gas separation component of the high-voltage bushing monitoring device according to the present invention;

[0021] Figure 4 A schematic structural diagram of a gas detection component of a high-voltage bushing monitoring device according to the present invention is shown at one viewing angle;

[0022] Figure 5 A schematic structural diagram of the gas detection component of the high-voltage bushing monitoring device according to the present invention is shown from another perspective.

[0023] The above drawings include the following reference numerals:

[0024] 10. Oil-gas separation component; 20. Gas detection component; 30. Oil-gas separation membrane group; 40. Air pressure sensor;

[0025] 110. Connecting piece; 120. Oil-gas separation body;

[0026] 111, first oil storage chamber; 121, second oil storage chamber;

[0027] 210, gas detection housing; 220, gas chamber; 230, laser light source module; 240, monitoring module; 250, control module;

[0028] 211, first side; 212, second side; 213, third side;

[0029] 231. Laser emitter; 232. Laser controller; 233. Collimator;

[0030] 310, permeable membrane; 320, support sheet; 330, oil-blocking seal ring; 340, gas seal ring;

[0031] 1201, exhaust hole; 1202, moisture detection hole;

[0032] 2101, laser mounting hole; 2102, air inlet hole group; 2103, air outlet hole group; 2104, monitoring mounting hole; 2105, air pressure detection hole;

[0033] 2401, pad; 2402, pad mounting hole; 2403, microphone; 2404, signal converter; 2405, signal amplifier. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] like Figures 1 to 5As shown, the high-voltage bushing monitoring device of the present invention includes: an oil-gas separation component 10, which is connected to the interior of the high-voltage bushing to receive insulating oil inside the high-voltage bushing and separate dissolved gas from the insulating oil; and a gas detection component 20, which is connected to the oil-gas separation component 10 and located on a side away from the high-voltage bushing, for receiving the dissolved gas separated from the oil-gas separation component 10 and detecting the components and corresponding concentrations of the dissolved gas. Thus, by designing the high-voltage bushing monitoring device as an interconnected oil-gas separation component 10 and gas detection component 20, the present invention makes the entire monitoring device compact and can be directly installed in a small space near the high-voltage bushing, thereby reducing the length of the oil pipeline and lowering the risk of leakage. Furthermore, by first separating the dissolved gas in the insulating oil and then performing gas concentration detection, interference of the oil sample on the test results is avoided, thereby improving detection accuracy. At the same time, since the gas detection component 20 is tightly coupled with the oil-gas separation component 10, the loss and contamination during the gas transfer process are reduced, thereby ensuring the reliability of the detection results. Therefore, the monitoring device of the present invention can continuously and in real time monitor the concentration changes of the gas inside the high-voltage bushing, and promptly discover potential insulation faults, thereby effectively solving the problem in the prior art that the high-voltage bushing monitoring device is too large and cannot achieve continuous monitoring.

[0036] like Figure 2 and Figure 3 As shown, the oil-gas separation component 10 also includes: a connecting piece 110, in which a first oil storage chamber 111 is provided for connecting to the high-voltage bushing to receive insulating oil from the high-voltage bushing. The firm connection between the connecting piece 110 and the high-voltage bushing ensures the stability of the entire monitoring device; an oil-gas separation body 120, which is connected to the connecting piece 110 and is located on the side of the connecting piece 110 away from the high-voltage bushing. A second oil storage chamber 121 communicating with the first oil storage chamber 111 is provided in the oil-gas separation body 120, and one end of the second oil storage chamber 121 away from the first oil storage chamber 111 is communicated with the gas detection component 20. By providing the second oil storage chamber 121 in the oil-gas separation body 120 and communicating its end away from the first oil storage chamber 111 with the gas detection component 20, the consumption of insulating oil during the monitoring process is reduced, especially for oil-poor equipment such as high-voltage bushings, thereby avoiding the damage to the internal insulation state caused by frequent oil production.

[0037] Preferably, one end of the connector 110 away from the oil-gas separation body 120 is a threaded structure and is threadedly connected to the high-voltage bushing, and the other end of the connector 110 is fixed to the gas detection component 20 through a fixing nut.

[0038] The oil-gas separation component 10 of the present invention also includes an oil-gas separation membrane group 30. The oil-gas separation membrane group 30 is arranged in the second oil storage chamber 121, and can effectively separate the dissolved gas in the insulating oil. The separation efficiency is high, ensuring that the gas detection component 20 receives pure gas to be tested, thereby improving the accuracy and sensitivity of gas detection.

[0039] like Figure 2 As shown, the oil-gas separation membrane group 30 includes a permeable membrane 310, which is arranged in the second oil storage chamber 121 to receive the insulating oil in the first oil storage chamber 111. The permeable membrane 310 is specifically used to separate dissolved gas from the insulating oil. Its high-efficiency separation ability ensures that the gas detection component 20 can receive pure gas samples, thereby improving the accuracy of gas detection.

[0040] Preferably, the design of the permeable membrane 310 only requires a small amount of oil sample to achieve efficient gas separation, which is beneficial to the subsequent monitoring process and reduces the loss of oil sample inside the high-voltage bushing. It is particularly important for high-voltage bushings with little oil, and helps to protect the insulation state inside the bushing.

[0041] The oil-gas separation membrane group 30 also includes a support sheet 320, which is arranged in the second oil storage chamber 121 and is located on the side of the permeable membrane 310 close to the gas detection component 20. The support sheet 320 is provided with a filter hole. The support sheet 320 is located on the side of the permeable membrane 310 close to the gas detection component 20. The permeable membrane 310 is made of a flexible material. The support sheet 320 not only provides the necessary mechanical support for the permeable membrane 310 to prevent it from deforming or rupturing under oil pressure, but also further purifies the gas passing through the permeable membrane through the filter holes thereon to ensure the purity of the gas sample.

[0042] Preferably, an oil-blocking sealing ring 330 is provided between the permeable membrane 310 and the first oil storage chamber 111, so that the permeable membrane 310 is supported in the second oil storage chamber 121 under the action of the oil-blocking sealing ring 330 and the supporting plate 320; a gas sealing ring 340 is provided between the supporting plate 320 and the gas detection component 20 to prevent the leakage of dissolved gas separated from the oil-gas separation membrane group 30. The setting of the oil-blocking sealing ring 330 and the gas sealing ring 340 effectively prevents the leakage of insulating oil and the leakage of dissolved gas separated from the oil-gas separation membrane group, thereby ensuring the safety of the monitoring process and the reliability of the results.

[0043] In the present invention, the diameter of the support plate 320 is greater than the diameter of the permeable membrane 310, and is located on the side of the permeable membrane 310 close to the gas detection component 20; specifically, the second oil storage chamber 121 is a stepped hole, and the stepped hole includes a first hole section and a second hole section connected to form an annular step surface, the inner diameter of the first hole section is greater than the inner diameter of the second hole section and the first hole section is located on the side of the second hole section close to the gas detection component 20, wherein the diameter of each component in the oil-gas separation module 30 is greater than the inner diameter of the second hole section and smaller than the inner diameter of the first hole section. During installation, the oil retaining sealing ring 330, the permeable membrane 310 and the support plate 320 are stacked in sequence on the annular step surface to support the permeable membrane 310 in the second oil storage chamber 121.

[0044] The permeable membrane 310 of the present invention is made of materials including fluoropolymers. Fluoropolymers such as FEP and PTFE have good chemical stability and good permeability to a variety of gases. Especially under high-pressure environments, they can effectively separate fault characteristic gases without adsorption or reaction, thereby ensuring the accuracy and stability of gas detection.

[0045] The thickness of the permeable membrane 310 of the present invention is 30 μm to 80 μm, preferably 50 μm, which balances the permeability and mechanical strength of the permeable membrane 310. The thin film-shaped permeable membrane 310 can improve the gas permeability, while the sufficient thickness can ensure that the permeable membrane 310 is not easily broken when subjected to the oil pressure inside the high-pressure casing, thereby extending the service life of the permeable membrane 310.

[0046] The support sheet 320 is made of stainless steel, which not only provides the physical support required by the permeable membrane, but also ensures the stability of the support structure during long-term operation due to its excellent corrosion resistance, thereby extending the overall life of the monitoring device.

[0047] The filter holes are circular holes with a diameter of 0.5 μm to 2 μm, preferably 1 μm, which can effectively filter out solid particles and other non-gas components in the oil, ensuring the purity of the gas entering the gas detection component 20 and improving detection accuracy and reliability.

[0048] There are multiple filter holes, which are spaced apart on the support sheet 320, ensuring that the gas can evenly reach the gas detection component 20 from the permeable membrane 310, avoiding problems of excessive local pressure or poor circulation, and making the gas detection process smoother and more efficient.

[0049] like Figure 4 and Figure 5As shown, the gas detection component 20 also includes a gas detection shell 210, and the gas detection shell 210 includes a first side 211, a second side 212 and a third side 213 connected in sequence, wherein the first side 211 is in contact with the oil-gas separation component 10, the second side 212 is perpendicular to the first side 211, and the third side 213 is parallel to the first side 211 and is located on the side of the first side 211 away from the oil-gas separation component 10.

[0050] Preferably, the gas detection housing 210 is made of brass.

[0051] In the present invention, the gas detection shell 210 is composed of a first side 211, a second side 212 and a third side 213, forming an orderly gas flow path from the oil and gas separation component 10 to the gas detection component 20, which is conducive to the smooth transmission and detection of the gas, avoids turbulence or retention during the gas flow process, and enhances the stability of the detection process.

[0052] The gas detection component 20 further includes a gas chamber 220 . The gas chamber 220 is disposed inside the gas detection housing 210 and communicates with the oil-gas separation membrane group 30 to receive dissolved gas separated in the oil-gas separation membrane group 30 .

[0053] Preferably, a closed gas chamber 220 is formed inside the gas detection housing 210, ensuring that the dissolved gas separated from the oil-gas separation membrane group 30 can be detected in an environment without external interference, thereby improving the accuracy of the detection results.

[0054] like Figure 1As shown, the gas detection component 20 also includes: a laser light source module 230, which is connected to the gas chamber 220 to provide a laser light source of a specific wavelength to the gas chamber 220. The laser light beam of a specific wavelength matches the absorption spectrum of a specific dissolved gas such as acetylene C2H2. The laser light source module 230 can specifically excite the target gas molecules, generate a photoacoustic effect, and generate an acoustic wave signal. This highly selective detection can effectively reduce the interference of other non-target gases and improve the detection accuracy; a monitoring module 240, wherein the detection probe of the monitoring module 240 is arranged in the gas chamber 220 to receive and monitor the acoustic wave signal generated after the dissolved gas is irradiated by the laser light source, and transmit the acoustic wave signal to the gas chamber 220. The wave signal is converted into an electrical signal, and the monitoring module 240 can instantly receive the sound wave signal generated by the photoacoustic effect, realizing real-time monitoring of the fault characteristic gas, thereby improving the timeliness of the fault warning; the control module 250, the control module 250 is electrically connected to the laser light source module 230 and the monitoring module 240 to control the working state of the laser light source module 230, and calculate the corresponding dissolved gas components and corresponding concentrations according to the received electrical signal from the monitoring module 240. The control module can receive the electrical signal from the monitoring module in real time, and quickly calculate the dissolved gas components and corresponding concentrations, providing immediate data support for fault diagnosis of power equipment, which is conducive to rapid response and decision-making.

[0055] like Figure 4 As shown, specifically, the gas detection housing 210 also includes a laser mounting hole 2101, which is arranged on the second side 212 and is connected to the gas chamber 220 to install the laser light source module 230. The setting of the laser mounting hole 2101 ensures that the laser light source module can be accurately aligned with the gas chamber 220. The collimated injection of the laser beam reduces light scattering, improves the signal-to-noise ratio of the photoacoustic detection, and thus improves the accuracy of dissolved gas detection.

[0056] like Figure 5 As shown, the gas detection shell 210 also includes an air inlet hole group 2102 and an air outlet hole group 2103, which are spaced apart on the third side 213 and are both connected to the gas chamber 220, wherein the air inlet hole group 2102 is used to introduce the gas to be purged, and the air outlet hole group 2103 is used to discharge the dissolved gas and the purge gas. The design of the air inlet hole group 2102 and the air outlet hole group 2103 realizes the introduction of the gas to be purged and the discharge of the dissolved gas and the purge gas, avoids the accumulation and contamination of the gas in the detection chamber, ensures that a fresh gas sample of the dissolved gas can be used for each detection, and improves the accuracy and reliability of the detection.

[0057] like Figure 5As shown, the gas detection housing 210 also includes a monitoring mounting hole 2104, which is located on the third side 213 and is connected to the gas chamber 220 for installing the monitoring module 240. The setting of the monitoring mounting hole 2104 enables the monitoring module to be accurately installed near the gas chamber 220, reducing the attenuation and delay in the signal transmission process, and enhancing the stability of the signal and the immediacy of detection.

[0058] Furthermore, the gas detection housing 210 also includes an air pressure detection hole 2105, which is located on the third side 213 and connected to the gas chamber 220, and is used to install an air pressure sensor 40 to monitor the air pressure changes in the gas chamber 220. The air pressure detection hole 2105 is used to install an air pressure sensor to realize real-time monitoring of the air pressure changes in the gas chamber 220, which helps to monitor the stability of the gas detection process, prevent overpressure or underpressure, and ensure the safe operation of the monitoring device.

[0059] In addition, the air inlet group 2102 and the air outlet group 2103 in the present invention are also provided with normally closed solenoid valves, which are electrically connected to the control module 250. In the initial installation stage, the solenoid valve on the air inlet group 2102 is opened to introduce the gas to be purged (dry air) to purge the monitoring device. At the same time, the solenoid valve on the air outlet group 2103 is opened to discharge the purge gas, remove impurities and moisture that may exist inside the device, and create clean environmental conditions for the normal operation of the device; after the monitoring is completed, the dissolved gas can be quickly discharged by opening the solenoid valve on the air outlet group 2103 to prepare a clean gas environment for the next monitoring, reducing waiting time and preparation process, and improving monitoring efficiency.

[0060] like Figure 1 As shown, the laser light source module 230 also includes: a laser emitter 231 for generating a laser beam; a laser controller 232, which is electrically connected to the laser emitter 231 to generate a driving signal to drive the laser emitter 231 to work. The close cooperation between the laser emitter 231 and the laser controller 232 ensures the stable output of the light source, reduces the impact of the external environment on the laser light source, and enhances the anti-interference ability of the entire monitoring system.

[0061] Specifically, the control module 250 is electrically connected to the laser controller 232 to transmit a control signal to the laser controller 232 .

[0062] like Figure 1As shown, the laser light source module 230 also includes a collimator 233, which is electrically connected to the laser emitter 231. The collimator 233 is installed on the gas detection component 20 and is arranged toward the gas chamber 220, so that the laser beam generated by the laser emitter 231 can be collimated and emitted into the gas chamber 220. The collimation processing of the laser beam by the collimator 233 reduces the risk of false alarm of the monitoring module 240 and improves the credibility of the detection result.

[0063] In the present invention, the installation angle of the collimator 233 is set by the laser mounting hole 2101. The laser mounting hole 2101 forms a certain angle with the normal of the inner wall surface of the gas chamber 220, and the angle is preferably 2 to 10 degrees. At this time, after the laser is emitted into the gas chamber 220 by the collimator 233, it can form a certain incident angle with the inner wall surface of the gas chamber 220, so that the laser produces multiple light reflections on the inner wall of the chamber, increasing the path length of the laser contacting the gas molecules, thereby enhancing the photoacoustic effect and improving the sensitivity and efficiency of gas detection.

[0064] like Figure 1 and Figure 5 As shown, the monitoring module 240 further includes a pad 2401 connected to the third side surface 213 of the gas detection housing 210, and a pad mounting hole 2402 having a larger diameter than the monitoring mounting hole 2104 is provided in the pad 2401. The design of the pad 2401 not only provides a mounting base for the microphone, so that the microphone can be fixed at a position closer to the gas chamber 220, but also provides additional installation space by the design that the pad mounting hole 2402 has a larger diameter than the monitoring mounting hole 2104. Microphone 2403, microphone 2403 is inserted into the pad mounting hole 2402, and the receiving end of microphone 2403 extends into the monitoring mounting hole 2104 to receive the sound wave signal from the gas chamber 220. Microphone 2403 extends into the monitoring mounting hole 2104 through the pad mounting hole 2402, directly receiving the sound wave signal from the gas chamber 220, reducing the loss in the signal transmission process, ensuring the stability and accuracy of signal reception, and thus improving the accuracy of gas concentration detection.

[0065] Preferably, by setting up a detachable mode of the pad 2401 and the microphone 2403, and a pluggable installation method of the microphone 2403, the modularity of the monitoring module 240 is improved, the replacement and maintenance of the microphone 2403 are facilitated, and the maintenance cost and downtime are reduced.

[0066] like Figure 1As shown, the monitoring module 240 also includes: a signal converter 2404, which is electrically connected to the microphone 2403 to receive the electrical signal output from the microphone 2403 and convert the electrical signal into a digital signal. By using digital signal processing technology, the accuracy and stability of the signal are improved, making subsequent data analysis more accurate; a signal amplifier 2405, which is electrically connected to the signal converter 2404 to receive the digital signal and amplify the digital signal into an amplified signal. This process significantly enhances the signal strength, which is especially important for weak photoacoustic signals, ensuring that a clear and reliable signal can be obtained even in a low-concentration gas environment; wherein, the control module 250 is electrically connected to the signal amplifier 2405 to receive and process the amplified signal and calculate the corresponding dissolved gas components and corresponding concentrations. The control module 250 receives the amplified digital signal and, through advanced data processing algorithms, can accurately calculate the concentration of dissolved gases such as acetylene (C2H2), providing key data for evaluating the insulation status of the high-voltage bushing and predicting potential faults.

[0067] Preferably, in the present invention, the laser controller 232 is electrically connected to the transmission signal amplifier 2405, and is used to generate a driving signal for the laser emitter 231 and send a reference signal to the signal amplifier 2405, so that the signal amplifier 2405 can work synchronously with the laser emitter 231 when receiving the reference signal. This synchronization mechanism reduces the phase error in the signal processing process, enhances the accuracy of signal amplification and processing, and ensures the reliability of the monitoring data; at the same time, the laser controller 232 can also control the operating temperature of the laser emitter 231 to maintain the stability and consistency of the laser output.

[0068] like Figure 2 and Figure 3 As shown, an exhaust hole 1201 is also provided on the oil-gas separation body 120. The exhaust hole 1201 is provided at the top of the oil-gas separation body 120 and is connected to the second oil storage chamber 121 for discharging the air in the oil-gas separation body 120. During the initial installation stage of the monitoring device, the air inside the oil-gas separation body 120 is discharged through the exhaust hole 1201, thereby avoiding interference of gases such as oxygen in the air with subsequent gas detection, thereby ensuring the accuracy of the measurement; a sealing member is also provided in the exhaust hole 1201 to seal the exhaust hole 1201 when the high-voltage bushing monitoring device is working, thereby ensuring that the exhaust hole 1201 can be effectively sealed when the monitoring device is working normally, preventing oil leakage and intrusion of outside air, maintaining the stability of the internal medium, reducing medium loss, and protecting the sealing of the high-voltage bushing monitoring device.

[0069] like Figure 2 and Figure 3As shown, a moisture detection hole 1202 is also provided on the oil-gas separation body 120, and the moisture detection hole 1202 is connected to the second oil storage chamber 121. The high-voltage bushing monitoring device also includes a moisture sensor 1203 at least partially installed in the moisture detection hole 1202, and the detection probe of the moisture sensor 1203 extends into the second oil storage chamber 121 to detect the moisture content in the insulating oil.

[0070] The moisture sensor 1203 extends into the second oil storage chamber 121 through the moisture detection hole 1202, and can monitor the moisture content in the insulating oil in real time. Moisture is one of the main factors that accelerate the aging of high-voltage bushings and damage the insulation performance. Continuous monitoring of moisture content can provide early warning of equipment aging and timely measures to prevent the occurrence of faults such as short circuits.

[0071] Specifically, the control module 250 is electrically connected to the moisture sensor 1203 to receive a detection signal from the moisture sensor 1203 to obtain moisture content data in the insulating oil according to the detection signal.

[0072] The monitoring process of the monitoring device of the present invention is as follows:

[0073] Initial installation phase:

[0074] 1. Connect one end of the oil-gas separation component 10 to the high-voltage bushing, then open the vent 1201 to exhaust the air in the oil-gas separation body 120. At this time, the transformer oil inside the high-voltage bushing flows into the oil-gas separation component 10, filling the oil sample and infiltrating the permeable membrane 310. After the transformer oil is full, immediately close the vent 1201 to prevent oil leakage.

[0075] 2. Open the solenoid valve on the air inlet group 2102 and inject dry air or inert gas to purge the gas detection component 20. At the same time, open the solenoid valve on the air outlet group 2103 to discharge the purge gas and remove any residual moisture or impurities. After the purge is completed, close the solenoid valve on the air inlet group 2102 and then close the solenoid valve on the air outlet group 2103 to ensure that the gas detection component 20 is in a closed state.

[0076] Testing process stages:

[0077] 1. The gas in the oil diffuses from the oil-gas separation membrane group 30 to one side of the support sheet 320 and enters the gas chamber 220 of the gas detection component 20;

[0078] 2. The laser light source module 230 is started, the laser emitter 231 emits laser light of a specific wavelength, and the laser controller 232 controls the intensity and operating temperature of the laser light. The laser light passes through the collimator 233 and is incident on the gas chamber 220 at a certain angle. It interacts with the gas molecules in the gas chamber 220 and produces a photoacoustic effect, that is, the gas molecules absorb the incident light energy and generate sound waves.

[0079] 3. The microphone 2403 detects the pressure fluctuation signal (i.e., photoacoustic signal) generated by the photoacoustic effect, and these signals are transmitted to the signal converter 2404 via a cable; the signal converter 2404 converts the analog electrical signal output by the microphone 2403 into a digital signal, preparing for subsequent data processing; the signal amplifier 2405 receives the digital signal, amplifies the signal according to the reference signal provided by the laser controller 232, and enhances the signal strength; the control center 2406 receives and processes the amplified digital signal, and calculates the components and corresponding concentrations of the measured gas through signal processing by the phase-locked amplifier 7 combined with the data analysis algorithm, and at the same time evaluates the potential impact of the moisture content on the detection results.

[0080] End of monitoring phase:

[0081] 1. Open the solenoid valve on the gas outlet group 2103 to exhaust the gas in the gas chamber 220 and prepare for the next monitoring.

[0082] 2. The air pressure sensor 40 monitors the internal pressure of the gas chamber 220 to ensure that the pressure changes smoothly during the gas discharge process to avoid damage to the high-voltage bushing monitoring device.

[0083] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0084] The high-voltage bushing monitoring device of the present invention includes: an oil-gas separation component 10, which is in communication with the interior of the high-voltage bushing to receive insulating oil in the high-voltage bushing and separate dissolved gas from the insulating oil; and a gas detection component 20, which is connected to the oil-gas separation component 10 and is located on a side away from the high-voltage bushing to receive the dissolved gas separated from the oil-gas separation component 10 and detect the components and corresponding concentrations of the dissolved gas.

[0085] As can be seen, the present invention, by designing the high-voltage bushing monitoring device as an interconnected oil-gas separation component 10 and gas detection component 20, makes the entire monitoring device compact and can be directly installed in a small space near the high-voltage bushing, thereby reducing the length of the oil pipeline and lowering the risk of leakage. Furthermore, by first separating the dissolved gas in the insulating oil and then performing gas concentration detection, interference with the test results by the oil sample is avoided, thereby improving detection accuracy. At the same time, because the gas detection component 20 is tightly coupled with the oil-gas separation component 10, losses and contamination during gas transfer are reduced, ensuring the reliability of the test results. Therefore, the monitoring device of the present invention can continuously and in real time monitor changes in gas concentration within the high-voltage bushing, promptly detecting potential insulation faults, and effectively solving the problem of high-voltage bushing monitoring devices in the prior art being too large and unable to achieve continuous monitoring.

[0086] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0087] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0088] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0089] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0090] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0091] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A high voltage bushing monitoring device, characterized in that: include: An oil-gas separation component (10), the oil-gas separation component (10) being in communication with the interior of the high-voltage bushing to receive insulating oil in the interior of the high-voltage bushing and to separate dissolved gas from the insulating oil; A gas detection component (20) is connected to the oil-gas separation component (10) and is located on a side away from the high-voltage bushing, for receiving the dissolved gas separated from the oil-gas separation component (10) and detecting the components and corresponding concentrations of the dissolved gas.

2. The high voltage bushing monitoring device according to claim 1, characterized in that: The oil-gas separation component (10) further includes: A connecting piece (110), wherein a first oil storage chamber (111) is provided in the connecting piece (110) for connecting to the high-voltage bushing to receive the insulating oil from the high-voltage bushing; an oil-gas separation body (120), the oil-gas separation body (120) being connected to the connecting piece (110) and being located on a side of the connecting piece (110) away from the high-voltage bushing; a second oil storage chamber (121) communicating with the first oil storage chamber (111) being provided in the oil-gas separation body (120); an end of the second oil storage chamber (121) away from the first oil storage chamber (111) being communicated with the gas detection component (20); An oil-gas separation membrane group (30) is provided in the second oil storage cavity (121).

3. The high voltage bushing monitoring device according to claim 2, characterized in that: The oil-gas separation membrane group (30) comprises: a permeable membrane (310), the permeable membrane (310) being arranged in the second oil storage chamber (121) to receive the insulating oil in the first oil storage chamber (111); a support sheet (320), the support sheet (320) being arranged in the second oil storage cavity (121) and located on a side of the permeable membrane (310) close to the gas detection component (20), and the support sheet (320) being provided with a filter hole; An oil-blocking sealing ring (330) is provided between the permeable membrane (310) and the first oil storage chamber (111), so that the permeable membrane (310) is supported in the second oil storage chamber (121) under the action of the oil-blocking sealing ring (330) and the supporting plate (320); and a gas sealing ring (340) is provided between the supporting plate (320) and the gas detection component (20) to prevent leakage of the dissolved gas separated from the oil-gas separation membrane group (30).

4. The high voltage bushing monitoring device according to claim 3, characterized in that: The permeable membrane (310) is made of a material comprising a fluoropolymer; and / or The thickness of the permeable membrane (310) is 30 μm to 80 μm; and / or The supporting plate (320) is made of stainless steel; and / or The filter holes are circular holes, and the diameter of the filter holes is 0.5 μm to 2 μm; and / or There are multiple filter holes, and the multiple filter holes are arranged at intervals on the support sheet (320).

5. The high voltage bushing monitoring device according to claim 2, characterized in that: The gas detection component (20) further comprises: A gas detection housing (210), the gas detection housing (210) comprising a first side surface (211), a second side surface (212), and a third side surface (213) connected in sequence, wherein the first side surface (211) contacts the oil-gas separation component (10), the second side surface (212) is perpendicular to the first side surface (211), and the third side surface (213) is parallel to the first side surface (211) and is located on a side of the first side surface (211) away from the oil-gas separation component (10); A gas chamber (220) is provided inside the gas detection housing (210) and is in communication with the oil-gas separation membrane group (30) to receive the dissolved gas separated in the oil-gas separation membrane group (30).

6. The high voltage bushing monitoring device according to claim 5, characterized in that: The gas detection component (20) further comprises: a laser light source module (230), the laser light source module (230) being in communication with the gas chamber (220) to provide a laser light source of a specific wavelength to the gas chamber (220); a monitoring module (240), wherein a detection probe of the monitoring module (240) is disposed in the gas chamber (220) to receive and monitor an acoustic wave signal generated after the laser light source irradiates the dissolved gas, and convert the acoustic wave signal into an electrical signal; A control module (250) is electrically connected to the laser light source module (230) and the monitoring module (240) to control the working state of the laser light source module (230) and calculate the corresponding components and concentrations of the dissolved gas according to the electrical signals received from the monitoring module (240).

7. The high voltage bushing monitoring device according to claim 6, characterized in that: The gas detection housing (210) further comprises: a laser mounting hole (2101), the laser mounting hole (2101) being arranged on the second side surface (212) and communicating with the gas chamber (220) for mounting the laser light source module (230); and / or An air inlet group (2102) and an air outlet group (2103) are spaced apart on the third side surface (213) and are both in communication with the gas chamber (220), wherein the air inlet group (2102) is used to introduce the gas to be purged, and the air outlet group (2103) is used to discharge the dissolved gas and the purging gas; and / or a monitoring installation hole (2104), located on the third side (213) and connected to the gas chamber (220), for installing the monitoring module (240); and / or an air pressure detection hole (2105), located on the third side surface (213) and connected to the gas chamber (220), for installing an air pressure sensor (40) to monitor air pressure changes in the gas chamber (220); and / or The laser light source module (230) further includes: a laser emitter (231) for generating a laser beam; a laser controller (232), the laser controller (232) being electrically connected to the laser emitter (231) to generate a driving signal for driving the laser emitter (231) to operate; and a collimator (233), the collimator (233) being electrically connected to the laser emitter (231), the collimator (233) being mounted on the gas detection component (20) and disposed toward the gas chamber (220), so that the laser beam generated by the laser emitter (231) is collimated and emitted into the gas chamber (220).

8. The high voltage bushing monitoring device according to claim 7, characterized in that: The monitoring module (240) further includes: a pad (2401), the pad (2401) being connected to the third side surface (213) of the gas detection housing (210), and a pad mounting hole (2402) having a diameter larger than that of the monitoring mounting hole (2104) being provided in the pad (2401); A microphone (2403), wherein the microphone (2403) is inserted into the pad mounting hole (2402), and the receiving end of the microphone (2403) extends into the monitoring mounting hole (2104) to receive the sound wave signal from the gas chamber (220).

9. The high voltage bushing monitoring device according to claim 8, characterized in that: The monitoring module (240) further includes: a signal converter (2404), the signal converter (2404) being electrically connected to the microphone (2403) to receive the electrical signal outputted from the microphone (2403) and convert the electrical signal into a digital signal; a signal amplifier (2405), the signal amplifier (2405) being electrically connected to the signal converter (2404) to receive the digital signal and amplify the digital signal into an amplified signal; The control module (250) is electrically connected to the signal amplifier (2405) to receive and process the amplified signal and calculate the corresponding components and concentrations of the dissolved gas.

10. The high voltage bushing monitoring device according to claim 2, characterized in that: The oil-gas separation body (120) is further provided with: an exhaust hole (1201), the exhaust hole (1201) being arranged at the top of the oil-gas separation body (120) and being in communication with the second oil storage chamber (121) for exhausting air in the oil-gas separation body (120); a sealing member being further arranged in the exhaust hole (1201) for sealing the exhaust hole (1201) when the high-voltage bushing monitoring device is in operation; A moisture detection hole (1202), the moisture detection hole (1202) is in communication with the second oil storage cavity (121), the high-voltage bushing monitoring device further comprises a moisture sensor (1203) at least partially installed in the moisture detection hole (1202), the detection probe of the moisture sensor (1203) extends into the second oil storage cavity (121) to detect the moisture content in the insulating oil.

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