Modular analysis device and equipment for analyzing dissolved gas in transformer oil

Abstract

The invention relates to the technical field of on-line detection of transformer oil, in particular to a modular analysis device and equipment for analyzing dissolved gas in transformer oil, the modular analysis device comprises a cabinet body provided with a cabinet door, and a quantitative oil well pump used for pumping out the transformer oil is arranged in the cabinet body; an oil-gas separation module, an enrichment module and an analyzer are arranged in the cabinet body in the vertical direction from bottom to top; the cabinet body is further internally provided with two connecting pipes, any end of each connecting pipe is provided with a quick connector, the two ends of one connecting pipe are communicated with the oil-gas separation module and the enrichment module respectively, the two ends of the other connecting pipe are communicated with the enrichment module and the analyzer respectively, and the two ends of the other connecting pipe are communicated with the oil-gas separation module and the enrichment module respectively. Two of the oil-gas separation module, the enrichment module and the analyzer are provided with interfaces which can be connected with the quick connectors. According to the invention, the overall space arrangement in the cabinet is optimized, and the operation and maintenance convenience is improved.

Description

Technical Field

[0001] This invention relates to the field of online transformer oil testing technology, specifically to a modular analysis device and equipment for analyzing dissolved gases in transformer oil. Background Technology

[0002] Transformer oil dissolved gas analyzers are mainly divided into online and offline types. Online transformer oil dissolved gas analyzers are usually installed near the transformer and can extract transformer oil from the transformer in real time and analyze the dissolved gases in the transformer oil.

[0003] For example, Chinese Patent Publication No. CN107436328B discloses a calibration method for an online chromatographic analyzer of transformer insulating oil, including the following steps: Step 1: Connect a quantitative gas sampling tube for offline detection to the degassing device of the online chromatographic analyzer of transformer insulating oil, and install a control valve at the front end of the quantitative gas sampling tube; Step 2: When the online chromatographic analyzer is performing normal online detection, the control valve is in the closed state to realize the normal online detection function; when it is necessary to compare and calibrate with the offline detection results in the laboratory, the control valve is opened, so that the gas chamber of the degassing device of the online chromatographic analyzer is connected to the quantitative gas sampling tube, and when the gas reaches a state of equilibrium... Step 3: When taking gas from the degassing device, adjust the balancing time and vacuuming number of the degassing device according to the different gas taking principles of the online chromatograph degassing device. Step 4: Collect transformer insulating oil samples and gas samples from the quantitative gas taking tube to the laboratory for analysis of the content of various gases, and obtain the content of various gases in the oil sample and the content of various gases in the gas sample. Step 5: Set the degassing capability correction coefficient K1(n) of the online chromatograph degassing device for each gas and the analysis accuracy correction coefficient K2(n) of the online chromatograph gas detector for each gas.

[0004] The above-mentioned scheme discloses a method for detecting and analyzing dissolved gases in transformer oil. When applied to actual operation, the internal components of the equipment using this method or other similar detection methods are basically similar and relatively independent, such as transformer oil filters, vacuum oil-gas separators, quantitative tubes, chromatographs or optical gas analyzers, etc. All of the above devices are independent entities and need to be fixed in the cabinet in sequence during installation. When connecting transformer oil filters, vacuum oil-gas separators, quantitative tubes, chromatographs or optical gas analyzers, there are both power-carrying wires and gas-transporting pipes. The structural distribution inside the cabinet is complex, and the lines and pipes are intertwined, which makes installation difficult and operation cumbersome. Furthermore, in subsequent maintenance, the intertwined lines and pipes will also cause inconvenience. Summary of the Invention

[0005] To address the aforementioned issues, a modular analytical device and equipment for analyzing dissolved gases in transformer oil is provided. Through a vertically layered modular layout within the cabinet, coupled with a connecting pipe design featuring quick-connect couplings, it specifically solves the core problems of existing devices, such as scattered components and chaotic piping. It eliminates the cumbersome process of fixing each dispersed component individually, optimizes the overall space layout within the cabinet, avoids crisscrossing and chaotic piping, significantly reduces installation difficulty, and simplifies the assembly process. Furthermore, the quick-connect couplings enable rapid disassembly and assembly of the gas circuit, eliminating the need for disassembling the entire device for subsequent maintenance. Individual modules can be disassembled, avoiding interference from complex piping and improving the convenience of operation and maintenance.

[0006] To address the problems of existing technologies, the present invention provides a modular analysis device for analyzing dissolved gases in transformer oil, comprising a cabinet with a door, wherein a quantitative oil pump for extracting transformer oil is installed inside the cabinet. The cabinet contains an oil-gas separation module, an enrichment module, and an analyzer arranged vertically from bottom to top. The cabinet also contains: There are two connecting pipes, each with a quick connector at one end. One connecting pipe is connected to the oil-gas separation module and the enrichment module at both ends, and the other connecting pipe is connected to the enrichment module and the analyzer at both ends. Two of the oil-gas separation module, the enrichment module, and the analyzer have interfaces that can be connected to the quick connector.

[0007] Preferably, the oil-gas separation module is equipped with: A partition is vertically installed inside the oil-gas separation module and divides the oil-gas separation module into a filter chamber and a separation chamber in the horizontal direction. There is a gap between the lower end of the partition and the bottom of the oil-gas separation module. A filter element is disposed in the filter chamber.

[0008] Preferably, an oil inlet is provided on the side wall of the filter chamber above the filter element, and the upper end face of the filter element slopes downward from the oil inlet toward the separation chamber.

[0009] Preferably, the lower part of the separation chamber is provided with an oil drain port.

[0010] Preferably, the bottom of the oil-gas separation module slopes downward from the filter chamber toward the separation chamber.

[0011] Preferably, the lower part of the oil-gas separation module, the enrichment module, and the analyzer is provided with guide rails to support and slide with the above three components. All the guide rails are inclined downward from the cabinet door toward the cabinet body and are fixedly connected to the cabinet body.

[0012] Preferably, the oil-gas separation module facing the cabinet door, the enrichment module facing the cabinet door, and the analyzer facing the cabinet door are all provided with handles.

[0013] Preferably, the upper part of the oil-gas separation module and the enrichment module is provided with a removable cover plate.

[0014] Preferably, a lifting bracket is vertically provided on the filter element, and the lifting bracket extends above the upper end surface of the filter element.

[0015] A modular analytical device for analyzing dissolved gases in transformer oil includes an oil return pipeline and a modular analytical apparatus for analyzing dissolved gases in transformer oil.

[0016] The advantages of this invention compared to the prior art are: 1. This invention addresses the core issues of scattered components and chaotic piping in existing devices by using a vertically layered modular layout within the cabinet, combined with a connecting pipe design featuring quick-connect fittings. It eliminates the cumbersome process of fixing each component individually, optimizes the overall space layout within the cabinet, avoids crisscrossing and chaotic piping, significantly reduces installation difficulty, and simplifies the assembly process. Furthermore, the quick-connect fittings enable rapid disassembly and assembly of the air circuits, eliminating the need to disassemble the entire device for subsequent maintenance. Individual modules can be disassembled, avoiding interference from complex piping and improving ease of operation and maintenance. Additionally, it fully utilizes the vertical space of the cabinet, enhancing the overall integration and neatness of the device.

[0017] 2. Through the coordinated design of the internal partitions, filters, inclined filter surfaces, inclined bottom, and oil drain of the oil-gas separation module, the transformer oil filtration and oil-gas separation are carried out in a step-by-step and orderly manner. The gap at the lower end of the partition enables simultaneous vacuuming of the two chambers, simplifying the preliminary preparation process. The inclined filter end face can avoid local oil accumulation, solving the problem of reduced filtration efficiency caused by oil bubble formation in a vacuum environment. At the same time, it increases the contact area between the oil and the vacuum environment, greatly improving the oil-gas separation efficiency. Combined with the inclined structure at the bottom of the module and the lower oil drain, the oil is directed and completely drained, eliminating oil sludge and residue, avoiding residual oil from affecting the subsequent separation accuracy, and preventing oil deterioration and contamination of the module's interior, ensuring the long-term stable operation of the device.

[0018] 3. Through the matching structural design of inclined guide rails, external handles, detachable covers, and filter element lifting brackets, each functional module can be pushed in along the guide rails and locked by its own gravity, achieving stable positioning without additional fixing parts. This prevents modules from slipping or shifting during operation, ensuring air circuit sealing and operational safety. The side handle of the cabinet door allows for tool-free quick pulling of modules, and the detachable cover opens the internal maintenance space, allowing for internal component inspection without disassembling the modules. The filter element lifting bracket also enables contactless and quick replacement of oily filters, avoiding hand contamination. This comprehensively simplifies the installation, maintenance, and replacement process, further reducing the difficulty of operation and maintenance, and improving the overall practicality and ease of use of the device. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a modular analysis device for analyzing dissolved gases in transformer oil according to the present invention.

[0020] Figure 2 This is a three-dimensional schematic diagram of a modular analysis device for analyzing dissolved gases in transformer oil, after the cabinet door and part of the cabinet side wall have been removed.

[0021] Figure 3 This is a side view of a modular analysis device for analyzing dissolved gases in transformer oil according to the present invention.

[0022] Figure 4 This invention relates to a modular analytical device for analyzing dissolved gases in transformer oil. Figure 3 Schematic diagram of cross-section at point AA.

[0023] Figure 5 This is a cross-sectional three-dimensional schematic diagram of a modular analysis device for analyzing dissolved gases in transformer oil according to the present invention.

[0024] Figure 6 This is a three-dimensional schematic diagram of the enrichment module being extracted in a modular analysis device for analyzing dissolved gases in transformer oil according to the present invention.

[0025] Figure 7 This is a three-dimensional schematic diagram of the oil-gas separation module being replaced in a modular analysis device for analyzing dissolved gases in transformer oil according to the present invention.

[0026] The following are the labels in the diagram: 1. Cabinet; 11. Cabinet door; 12. Guide rail; 2. Quantitative oil pump; 3. Oil-gas separation module; 31. Partition; 311. Filter chamber; 312. Separation chamber; 313. Oil inlet; 32. Filter element; 321. Lifting bracket; 33. Oil outlet; 4. Enrichment module; 41. Enrichment chamber; 42. Filter membrane; 5. Analyzer; 6. Connecting pipe; 61. Quick connector; 7. Interface; 8. Handle; 9. Cover plate. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 7 A modular analytical device for analyzing dissolved gases in transformer oil includes a cabinet 1 with a door 11, and a quantitative oil pump 2 for extracting transformer oil is installed inside the cabinet 1. The cabinet 1 is equipped with an oil-gas separation module 3, an enrichment module 4 and an analyzer 5 arranged vertically from bottom to top. The cabinet 1 is also equipped with: There are two connecting pipes 6. Each end of the connecting pipe 6 is provided with a quick connector 61. The two ends of one connecting pipe 6 are connected to the oil-gas separation module 3 and the enrichment module 4, respectively. The two ends of the other connecting pipe 6 are connected to the enrichment module 4 and the analyzer 5, respectively. Two of the oil-gas separation module 3, the enrichment module 4 and the analyzer 5 have interfaces 7 that can be connected to the quick connector 61.

[0029] The enrichment module 4 includes an enrichment chamber 41 and a filter membrane 42. The enrichment chamber 41 is connected to the oil-gas separation module 3 through a connecting pipe 6. The filter membrane 42 is horizontally set in the enrichment chamber 41. The dissolved gas separated by the oil-gas separation module 3 enters the enrichment chamber 41 and needs to be filtered by the filter membrane 42 before it can be discharged, so as to avoid the impurities in the dissolved gas from affecting the analysis results.

[0030] Inside the cabinet 1, the oil-gas separation module 3, enrichment module 4, and analyzer 5 are arranged vertically from bottom to top, adopting a layered modular layout. Two connecting pipes 6 with quick-connect fittings 61 connect the gas paths between the functional modules. One connecting pipe 6 uses the quick-connect fitting 61 to quickly connect the oil-gas separation module 3 and the enrichment module 4, while the other connecting pipe 6 uses the quick-connect fitting 61 to quickly connect the enrichment module 4 and the analyzer 5. Interfaces 7 for the quick-connect fittings 61 are reserved for two corresponding modules in the oil-gas separation module 3, enrichment module 4, and analyzer 5 to ensure convenient and airtight gas path connections.

[0031] In the early stage of device operation, the quantitative oil pump 2 is started to extract transformer oil from inside the transformer and transport it to the oil-gas separation module 3. The oil-gas separation module 3 performs oil-gas separation treatment on the incoming transformer oil. The separated dissolved gas enters the enrichment chamber 41 of the enrichment module 4 through the corresponding connecting pipe 6. After entering the enrichment chamber 41, the dissolved gas needs to be filtered by the filter membrane 42 horizontally set inside the enrichment chamber 41. The filter membrane 42 can intercept impurities mixed in the dissolved gas. The pure dissolved gas after removing impurities is then transported to the analyzer 5 through another connecting pipe 6. The analyzer 5 performs accurate analysis of the dissolved gas. The entire process relies on the cooperation of each module and the connecting pipe 6 to realize the whole process of transformer oil dissolved gas extraction, separation, enrichment filtration and analysis.

[0032] During equipment maintenance, the quick connector 61 on the connecting pipe 6 can be directly disconnected from the corresponding interface 7 to quickly disconnect the gas circuit connection of the corresponding functional module. Without disassembling the complex and intertwined pipelines and lines, the oil-gas separation module 3, enrichment module 4, or analyzer 5 can be inspected and maintained separately. After maintenance, the connection can be quickly reset through the quick connector 61 to restore the normal operation of the equipment.

[0033] The modular integrated layout of the oil-gas separation module 3, enrichment module 4, and analyzer 5, arranged in layers from bottom to top within the cabinet 1, along with two connecting pipes 6 with quick connectors 61, enables rapid docking between modules. This not only optimizes the internal structure of the cabinet 1, avoiding disorderly pipeline intersections and significantly reducing overall installation difficulty and simplifying the assembly process, eliminating the need for complex component fixing and pipeline docking operations, but also effectively improves assembly efficiency. Furthermore, the detachable connection of the quick connectors 61 allows for quick separation of the gas path and individual disassembly and assembly of corresponding modules during subsequent maintenance and repair, without disassembling the entire device. This completely avoids interference from complex pipelines, significantly improving maintenance convenience and reducing operation and maintenance difficulty and time consumption. In addition, the horizontally positioned filter membrane 42 within the enrichment module 4 effectively filters impurities in the dissolved gas, preventing impurities from interfering with the analyzer 5's detection, ensuring the accuracy and reliability of dissolved gas analysis results. The overall modular design also fully utilizes the vertical space of the cabinet 1, making the internal layout more compact and orderly, improving the device's integration and overall integrity, and comprehensively optimizing the user experience throughout the entire process of installation, operation, and maintenance.

[0034] Reference Figure 4 The oil-gas separation module 3 is equipped with: A partition 31 is vertically installed inside the oil-gas separation module 3 and divides the oil-gas separation module 3 into a filter chamber 311 and a separation chamber 312 in the horizontal direction. There is a gap between the lower end of the partition 31 and the bottom of the oil-gas separation module 3. The filter element 32 is disposed in the filter chamber 311.

[0035] The internal space of the oil-gas separation module 3 is divided into a filtration chamber 311 and a separation chamber 312 by a vertical partition 31, enabling the step-by-step and orderly operation of transformer oil filtration and oil-gas separation, avoiding mutual interference between the filtration and separation processes, and ensuring the stability of the oil-gas separation process. The gap reserved at the lower end of the partition 31 allows the filtration chamber 311 and the separation chamber 312 to be connected, enabling the establishment of a unified vacuum environment in both chambers simultaneously before the oil-gas separation operation, eliminating the need to evacuate a single chamber separately, simplifying the vacuum establishment process, and improving the efficiency of the preliminary preparation. The transformer oil first enters the filtration chamber 311 and is filtered for impurities by the filter element 32, and then flows smoothly into the separation chamber 312 through the bottom gap to carry out oil-gas separation. This ensures the oil filtration effect and achieves orderly oil flow, preventing oil from accumulating inside the oil-gas separation module 3. At the same time, it continues the modular internal integrated design, eliminating the need for additional independent filter components, further optimizing the internal space layout of the cabinet, and continuing the advantage of convenient overall installation.

[0036] Reference Figure 4 , Figure 5 and Figure 7 An oil inlet 313 is provided on the side wall of the filter chamber 311 above the filter element 32, and the upper end face of the filter element 32 slopes downward from the oil inlet 313 toward the separation chamber 312.

[0037] The oil inlet 313 is located on the side wall of the filter chamber 311 above the filter element 32, allowing the transformer oil delivered by the metering pump 2 to fall directly onto the upper surface of the filter element 32, ensuring full contact between the oil and the filter element 32. The upper surface of the filter element 32 is designed with an inclination, which guides the transformer oil to flow and diffuse naturally along the inclination surface, preventing the oil from accumulating in local areas of the filter element 32. This solves the problem of reduced filtration speed and efficiency caused by oil bubble formation in a vacuum environment, and ensures smooth and continuous filtration through uniform flow guidance. At the same time, the inclination can accelerate the flow of oil through the filter element 32, expand the contact area between the oil and the vacuum environment, and further improve the overall oil-gas separation efficiency in conjunction with the oil-gas separation process. This optimizes the oil treatment effect from the source and avoids the impact of oil sludge on the stability of the device operation.

[0038] Reference Figure 4 and Figure 5 The lower part of the separation chamber 312 is provided with an oil drain port 33.

[0039] The oil drain port 33 is located at the lower part of the separation chamber 312, close to the sedimentation position of the transformer oil after oil-gas separation. It can promptly discharge the processed transformer oil from the oil-gas separation module 3 after the oil-gas separation process is completed, avoiding the long-term retention of separated oil in the separation chamber 312. This prevents residual oil from affecting the accuracy of the next oil-gas separation operation and also avoids oil deterioration and contamination of the module's internal structure. The layout of the oil drain port 33 fits the internal flow guidance logic of the module, eliminating the need for additional pumping components. Oil can be drained by its own gravity, simplifying the device operation process. At the same time, it avoids the problems of internal blockage and increased maintenance difficulty caused by residual oil, further improving the stability of the device operation and the convenience of subsequent maintenance.

[0040] Reference Figure 4 and Figure 5 The bottom of the oil-gas separation module 3 slopes downward from the filter chamber 311 toward the separation chamber 312.

[0041] The bottom of the oil-gas separation module 3 is sloping downwards towards the separation chamber 312. This allows for the directional flow of the filtered transformer oil flowing into the bottom of the module, enabling the oil to quickly converge along the sloping bottom surface to the lower part of the separation chamber 312. This, combined with the oil drain port 33 at the bottom of the separation chamber 312, ensures complete oil drainage, effectively solving the problem of oil accumulation and residue at the bottom of the module. This guarantees that no residual oil remains inside the module after each operation, preventing residual oil from interfering with the subsequent oil-gas separation accuracy. At the same time, the sloping bottom surface allows the oil flowing through the filter element 32 to spread out quickly, further increasing the contact area between the oil and the vacuum environment, enhancing the oil-gas separation effect, and improving the separation efficiency of dissolved gases. Moreover, this integrated sloping bottom design requires no additional assembly parts, continuing the advantages of modular assembly and not increasing installation difficulty.

[0042] Reference Figure 6 The lower part of the oil-gas separation module 3, the enrichment module 4 and the analyzer 5 are all provided with guide rails 12 to support the above three and slide in cooperation with the above three. All the guide rails 12 are inclined downward from the cabinet door 11 toward the cabinet body 1 and are fixedly connected to the cabinet body 1.

[0043] The inclined guide rail 12 provides a stable sliding support structure for the oil-gas separation module 3, enrichment module 4, and analyzer 5. During installation, each module is simply pushed into the cabinet 1 along the guide rail 12. Relying on the downward tilt of the guide rail 12 towards the cabinet 1, each module can lock itself in place by its own weight, eliminating the need for additional fasteners. This simplifies the module installation process and solves the problem of cumbersome work caused by the need to fix each of the traditional dispersed components one by one, significantly reducing installation difficulty. The sliding guide rail 12 design facilitates quick assembly and disassembly of the modules. Combined with the quick connector 61 connecting the pipe 6, it further optimizes installation and maintenance efficiency. At the same time, the locking effect of the inclined guide rail 12 can prevent the modules from sliding or falling during the operation of the device, ensuring the structural stability of the device during operation and preventing pipeline detachment and gas leakage caused by module displacement. This ensures the airtightness of the gas connection and the safety of the device operation.

[0044] Reference Figure 6 and Figure 7 The oil-gas separation module 3 facing the cabinet door 11, the enrichment module 4 facing the cabinet door 11, and the analyzer 5 facing the cabinet door 11 are all equipped with handles 8.

[0045] Handles 8 are positioned on the side of each module facing the cabinet door 11, conforming to the opening and closing direction of the cabinet door 11. When performing maintenance, staff can directly apply force through handles 8 to smoothly pull the corresponding module out of the cabinet 1 along the inclined guide rail 12 without the need for additional tools, making the operation simple and effortless. This design further optimizes the convenience of modular maintenance. When inspecting a single module, the target module can be quickly pulled out separately, avoiding interference from other modules and pipelines inside the cabinet, and avoiding maintenance inconvenience caused by limited operating space. At the same time, the layout of handles 8 does not affect the normal pushing and locking of modules or the internal space layout of the cabinet, and does not disrupt the compactness of the overall device, ensuring the convenience of operation for staff throughout the process and reducing the difficulty of operation and maintenance.

[0046] Reference Figure 7 The upper part of the oil-gas separation module 3 and the enrichment module 4 is provided with a removable cover plate 9.

[0047] Sealing rings are provided between the two cover plates 9 and the corresponding two modules. The removable cover plates 9 cover the top of the oil-gas separation module 3 and the enrichment module 4. During normal operation, they can close the top of the module to prevent external dust and impurities from entering the module and contaminating the oil and dissolved gases, thus ensuring the cleanliness of the oil-gas separation and gas enrichment filtration process and ensuring the accuracy of analysis. When it is necessary to inspect, replace or clean the internal parts of the module, the cover plates 9 can be removed directly to quickly open the internal space of the module without disassembling the entire module. This makes it convenient for staff to inspect, clean and replace the internal filter elements 32, filter membrane 42, valve body and other core components, solving the problem of small internal maintenance space and inconvenient operation, and further simplifying the internal maintenance process. At the same time, the removable cover plates 9 are easy to install and can be quickly reset and closed after maintenance without affecting the sealing performance of the module and the vacuum environment establishment effect.

[0048] Reference Figure 5 and Figure 7 A lifting bracket 321 is vertically provided on the filter element 32, and the lifting bracket 321 extends above the upper end surface of the filter element 32.

[0049] The vertically positioned lifting bracket 321 is fixed to the filter element 32 and extends above the upper surface of the filter element 32, leaving sufficient space for force application. When the filter element 32 needs to be replaced after long-term use, the operator can directly grab the lifting bracket 321 to remove the filter element 32 as a whole from the filter chamber 311 without directly contacting the oil-contaminated filter element 32 body, thus avoiding hand contamination and improving the cleanliness of maintenance operations. At the same time, the lifting bracket 321 ensures that the filter element 32 is subjected to uniform force during removal, preventing the filter element 32 from breaking due to uneven force and preventing residual debris from falling into the module. When used with the removable cover plate 9, the replacement of the filter element 32 can be completed quickly, further optimizing the internal maintenance efficiency of the oil-gas separation module 3 and solving the problems of cumbersome replacement of traditional filter components and easy hand contamination.

[0050] Reference Figures 1 to 7 A modular analytical device for analyzing dissolved gases in transformer oil, comprising an oil return pipeline and a modular analytical apparatus for analyzing dissolved gases in transformer oil.

[0051] Working principle: During installation, the quantitative oil pump 2 is installed at the bottom inside the cabinet 1. Then, an oil pipe is used to connect the output end of the quantitative oil pump 2 to the oil inlet 313 on the oil-gas separation module 3. An oil pipe is also connected between the quantitative oil pump 2 and the transformer. After completing the connection between the quantitative oil pump 2 and the oil-gas separation module 3, the oil-gas separation module 3 is pushed into the guide rail 12. Then, a connecting pipe 6 is used to connect the separation chamber 312 in the oil-gas separation module 3 to the enrichment chamber 41 in the enrichment module 4. The present invention provides an interface 7 on both the oil-gas separation module 3 and the enrichment module 4. The interface 7 on the enrichment module 4 is located above the filter membrane 42. The dissolved gas separated by the oil-gas separation module 3 enters the enrichment chamber 41 from below the filter membrane 42, then passes through the filter membrane 42 and is discharged into the analyzer 5 for analysis through the interface 7 on the enrichment module 4. In this invention, one end of a connecting pipe 6 without a quick connector 61 is fixedly mounted on the enrichment module 4. The connection between the connecting pipe 6 and the enrichment module 4 is located below the filter membrane 42. When connecting, simply connect the quick connector 61 on the connecting pipe 6 to the interface 7 on the oil-gas separation module 3. The quick connector 61 is a commonly used quick connector for oil-gas pipes on the market. Since there are many types of such quick interfaces 7, they will not be described in detail here. After the oil-gas separation module 3 and the enrichment module 4 are connected, the enrichment module 4 is pushed into the guide rail 12 located above the oil-gas separation module 3. Then, another connecting pipe 6 is used to connect the enrichment module 4 to the analyzer 5. The end of the connecting pipe 6 without the quick connector 61 is fixedly connected to the sample inlet of the analyzer 5, and the quick connector 61 at the end of the connecting pipe 6 is connected to the interface 7 on the enrichment module 4. After the connection is completed, the analyzer 5 is pushed into the guide rail 12 above the enrichment module 4. Since the guide rail 12 is inclined inward into the cabinet 1, the oil-gas separation module 3, the enrichment module 4 and the analyzer 5 pushed into the guide rail 12 can lock themselves by their own weight, and will not slip off the guide rail 12 and fall during operation. Both the oil-gas separation module 3 and the enrichment module 4 have built-in valve bodies. The valve bodies are located inside the interface 7. The valve body in the oil-gas separation module 3 is used to control the connection between the oil-gas separation module 3 and the enrichment module 4, and the valve body in the enrichment module 4 is used to control the connection between the enrichment module 4 and the analyzer 5.

[0052] During operation, since the oil-gas separation module 3 integrates the traditional oil-gas separator and transformer oil filter into one unit, it can both filter the transformer oil and perform oil-gas separation. The enrichment module 4 is equipped with a vacuum pump connected to the enrichment chamber 41 to extract gas from it. Before oil-gas separation, the enrichment module 4 is disconnected from the analyzer 5, and the oil-gas separation module 3 is disconnected from the transformer. The vacuum pump in the enrichment module 4 establishes a vacuum environment for the enrichment chamber 41, the filter chamber 311, and the separation chamber 312. At this time, the enrichment module 4 is connected to the analyzer 5. Subsequently, the metering pump 2 discharges a metered amount of transformer oil through the inlet 313 on the oil-gas separation module 3 into the filter chamber 311. After being filtered by the filter element 32, the oil falls to the bottom of the oil-gas separation module 3 and flows towards the lower part of the separation chamber 312 under the guidance of the bottom of the oil-gas separation module 3. It is worth noting that, since the filter chamber 311 and the separation chamber 312 are interconnected through the gap below the partition 31 before the transformer oil enters the oil-gas separation module 3, both the filter chamber 311 and the separation chamber 312 can establish a vacuum environment. Therefore, when the transformer oil is injected, the oil-gas separation phenomenon begins. The transformer oil passes through the filter element 32 under its own gravity. When the filter element 32 filters the transformer, the filter holes in the filter element 32 will separate the transformer oil into a large number of extremely thin oil films, small oil droplets or slender oil columns, so that the gas-liquid contact surface area of ​​the oil increases geometrically compared with the static oil surface, thereby improving the oil-gas separation efficiency. At the same time, the transformer oil will fall to the bottom of the oil-gas separation module 3 after filtration. Since the transformer oil passing through the filter element 32 cannot all fall to the bottom of the oil-gas separation module 3 at the same time, the transformer oil falling to the bottom of the oil-gas separation module 3 will spread out at the bottom of the oil-gas separation module 3, further improving the oil-gas separation efficiency.

[0053] It is worth noting that since the filter chamber 311 is already in a vacuum state when the transformer oil is injected, the transformer oil will bubble when it falls on the filter element 32, which will reduce the speed at which the transformer oil passes through the filter element 32 and thus reduce the filtration efficiency. In order to overcome the above problem, the upper part of the filter element 32 is set to be inclined, so that the transformer oil will not accumulate in the same position of the filter element 32, but will flow and diffuse on the upper part of the filter element 32 under the guidance of the upper end face of the filter element 32, thereby making up for the problem of reduced filtration efficiency.

[0054] After oil-gas separation is completed, the oil-gas separation module 3 is disconnected from the enrichment module 4. Carrier gas is then injected into the enrichment chamber 41 of the enrichment module 4, pressurizing it. At this time, the enrichment module 4 remains disconnected from the analyzer 5. After pressurization, the enrichment module 4 is connected to the analyzer 5, which analyzes the dissolved gas. Simultaneously, the oil drain port 33 in the oil-gas separation module 3 opens, draining the transformer oil stored at the bottom of the oil-gas separation module 3. Because the bottom of the oil-gas separation module 3 is inclined towards the separation chamber 312, the oil drain port 33, guided by the bottom of the oil-gas separation module 3, can drain all the transformer oil after oil-gas separation.

[0055] When maintenance is required, staff need to pull out the oil-gas separation module 3, enrichment module 4, or analyzer 5 requiring maintenance using handle 8. During this process, the connecting pipe 6 used for connection must be disconnected. When maintaining the oil-gas separation module 3, the filter element 32 is usually replaced. Since the filter element 32 often has significant oil residue, it can be removed by gripping the lifting bracket 321. Because the lifting bracket 321 extends above the filter element 32, hands will not be soiled with oil when removing it.

[0056] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A modular analysis device for analyzing dissolved gases in transformer oil, comprising a cabinet (1) with a door (11), wherein a quantitative oil pump (2) for extracting transformer oil is provided inside the cabinet (1). Its features are, The cabinet (1) is equipped with an oil-gas separation module (3), an enrichment module (4) and an analyzer (5) arranged vertically from bottom to top. The cabinet (1) is also equipped with: There are two connecting pipes (6), and a quick connector (61) is provided at one end of each connecting pipe (6). One end of the connecting pipe (6) is connected to the oil-gas separation module (3) and the enrichment module (4) respectively, and the other end of the connecting pipe (6) is connected to the enrichment module (4) and the analyzer (5) respectively. Two of the oil-gas separation module (3), the enrichment module (4) and the analyzer (5) have interfaces (7) that can be connected to the quick connector (61).

2. The modular analysis device for analyzing dissolved gases in transformer oil according to claim 1, characterized in that, The oil-gas separation module (3) is equipped with: A partition (31) is vertically installed inside the oil-gas separation module (3) and divides the oil-gas separation module (3) into a filter chamber (311) and a separation chamber (312) in the horizontal direction. There is a gap between the lower end of the partition (31) and the bottom of the oil-gas separation module (3). A filter element (32) is disposed in the filter chamber (311).

3. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 2, characterized in that, An oil inlet (313) is provided on the side wall of the filter chamber (311) above the filter element (32), and the upper end face of the filter element (32) is inclined downward from the oil inlet (313) toward the separation chamber (312).

4. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 2, characterized in that, The lower part of the separation chamber (312) is provided with an oil drain port (33).

5. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 4, characterized in that, The bottom of the oil-gas separation module (3) slopes downward from the filter chamber (311) toward the separation chamber (312).

6. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 1, characterized in that, The oil-gas separation module (3), the enrichment module (4) and the analyzer (5) are all provided with guide rails (12) at the bottom to support the above three and slide in cooperation with the above three. All the guide rails (12) are inclined downward from the cabinet door (11) toward the cabinet body (1) and are fixedly connected to the cabinet body (1).

7. A modular analytical apparatus for analyzing dissolved gases in transformer oil according to claim 6, characterized in that, The oil-gas separation module (3) facing the cabinet door (11), the enrichment module (4) facing the cabinet door (11), and the analyzer (5) facing the cabinet door (11) are all equipped with handles (8).

8. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 1, characterized in that, The upper part of the oil-gas separation module (3) and the enrichment module (4) is provided with a removable cover plate (9).

9. A modular analytical device for analyzing dissolved gases in transformer oil according to claim 2, characterized in that, A lifting bracket (321) is vertically provided on the filter element (32), and the lifting bracket (321) extends above the upper end face of the filter element (32).

10. A modular analytical device for analyzing dissolved gases in transformer oil, characterized in that, It includes an oil return pipeline and a modular analysis device for analyzing dissolved gases in transformer oil as described in any one of claims 1-9.

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