Online detection system for dissolved gas in transformer oil

Abstract

The invention relates to the technical field of transformer monitoring, in particular to an online detection system for dissolved gas in transformer oil, which comprises an oil-gas separation module, the oil-gas separation module comprises a separation bin which is vertically arranged on one side of the oil sample quantitative collection module and is communicated with the oil sample quantitative collection module; the deformation film is of an annular structure and is arranged in the separation bin, the separation bin and the upper portion of the deformation film jointly form a separation cavity used for storing transformer oil, an inner ring of the deformation film is an oil discharge outlet, and a valve body is arranged on the lower portion of the oil discharge outlet; the lifting device is arranged below the deformation film and used for driving the inner ring of the deformation film to ascend and descend, when the inner ring of the deformation film ascends to the highest position, the upper end face of the deformation film is in a horizontal shape, and when the inner ring of the deformation film descends to the lowest position, the upper end face of the deformation film is in a funnel shape; and the extraction opening is formed in the top of the separation bin and communicates with the gas collection module. According to the invention, fault misjudgment is avoided, and the long-term stability and detection accuracy of online monitoring are improved.

Description

Technical Field

[0001] This invention relates to the field of transformer monitoring technology, specifically to an online detection system for dissolved gases in transformer oil. Background Technology

[0002] Dissolved gases in transformer oil can reflect the operating status of the transformer. By detecting dissolved gases, early warnings can be issued in the early stages of transformer faults, preventing the fault from worsening and causing the transformer to burn out.

[0003] Chinese Patent Publication No. CN116539534B discloses an online monitoring device for dissolved gases in transformer oil based on remote data analysis. The device comprises: a transformer oil cylinder, an oil pump, an oil sample quantitative acquisition module, an oil-gas separation module, a gas collection module, a first vacuum pump, a gas optical recognition module, a buffer return oil module, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a communication module, and a controller. The gas optical recognition module includes an optical sensor. The oil outlet of the transformer oil cylinder is connected to the oil inlet of the oil sample quantitative acquisition module via the oil pump, and the oil outlet of the oil sample quantitative acquisition module is connected to the... The first valve is connected to the oil inlet of the oil-gas separation module, the oil outlet of the oil-gas separation module is connected to the oil inlet of the buffer return oil module, and the oil outlet of the buffer return oil module is connected to the oil inlet of the oil cylinder; the gas outlet of the oil-gas separation module is connected to the gas inlet of the gas collection module through the second valve, the gas outlet of the gas collection module is connected to the gas inlet of the gas optical recognition module through the third valve, and the gas outlet of the gas optical recognition module is connected to the outside through the fourth valve; the first vacuum pump is connected to the gas inlet of the gas collection module through the fifth valve; and the communication module establishes a communication connection with the server.

[0004] After oil-gas separation, the above solution leaves some transformer oil trapped at the bottom of the oil-gas separation module. Improving drainage requires creating a drain outlet at the bottom of the module, which would prevent the magnetic stirring device originally installed at the bottom from being properly installed. Furthermore, because the bottom of the oil-gas separation module is horizontal, even with a drain outlet, some transformer oil will still remain. This residual oil is prone to deterioration after prolonged standing, potentially contaminating the quality of subsequent transformer oil, and the oil accumulation problem worsens with operation. While there may be no obvious abnormalities in the short term, long-term use can lead to continuous data drift and misdiagnosis of faults. Summary of the Invention

[0005] To address the aforementioned issues, an online dissolved gas detection system for transformer oil is provided. This system utilizes an annular deformation membrane installed inside the separation chamber, coupled with a lifting device to control the raising and lowering of the inner ring of the membrane. During the oil-gas separation stage, the inner ring of the deformation membrane is raised to its highest position, ensuring the upper surface of the membrane remains horizontal. This guarantees a stable oil storage and separation space within the separation chamber, ensuring sufficient contact between the transformer oil and the vacuum environment, and maximizing dissolved gas extraction efficiency. During the oil discharge stage, the inner ring of the deformation membrane is lowered to its lowest position, forming a funnel shape at its upper surface. Utilizing the guiding nature of the funnel structure, and with the opening of the valve at the bottom of the discharge port, the degassed oil within the separation chamber is completely discharged, preventing oil residue accumulation at the bottom of the separation chamber.

[0006] To address the problems of existing technologies, this invention provides an online detection system for dissolved gases in transformer oil, comprising a gas optical recognition module, a gas collection module, a transformer oil cylinder, an oil sample quantitative acquisition module, and an oil-gas separation module; The oil-gas separation module includes: The separation chamber is vertically installed on one side of the oil sample quantitative acquisition module and is connected to the oil sample quantitative acquisition module; A deformation membrane, in the form of a ring, is disposed inside the separation chamber. The separation chamber and the upper part of the deformation membrane together form a separation cavity for storing transformer oil. The inner ring of the deformation membrane is an oil drain port, and a valve body is disposed at the lower part of the oil drain port. A lifting device is installed below the deformable membrane to drive the inner ring of the deformable membrane to rise and fall. When the inner ring of the deformable membrane rises to the highest position, the upper end face of the deformable membrane is horizontal. When the inner ring of the deformable membrane falls to the lowest position, the upper end face of the deformable membrane is funnel-shaped. An exhaust port is located at the top of the separation chamber and is connected to the gas collection module.

[0007] Preferably, when the deformation membrane is horizontal, the ratio of the oil level of the rated amount of transformer oil stored in the separation chamber to the diameter of the separation chamber is less than 0.1.

[0008] Preferably, the deformable membrane has multiple layers.

[0009] Preferably, the inner layer of the deformable membrane in contact with the transformer oil is made of an oleophobic elastic material.

[0010] Preferably, the lifting device includes a lifting ring fixedly disposed between the oil drain port and the valve body.

[0011] Preferably, the lifting device further includes: An extension ring is fixedly disposed on the inner wall of the separation chamber along the axis of the separation chamber, and the extension ring is located below the deformation membrane; A sealing ring is disposed on the upper part of the lifting ring, and the sealing ring is coaxial with the lifting ring.

[0012] Preferably, the side wall of the separation chamber is provided with an oil inlet for transformer oil to enter, and the oil inlet is located in the lower layer of the separation chamber.

[0013] Preferably, the separation chamber is provided with an agitation unit for stirring the transformer oil.

[0014] Preferably, the agitation unit includes: The stirring frame is vertically rotatable within the separation chamber; A drive unit is located on one side of the agitator and is used to drive the agitator to rotate.

[0015] Preferably, the driving unit is magnetically driven.

[0016] The advantages of this invention compared to the prior art are: 1. This invention, by setting an annular deformation membrane inside the separation chamber and using a lifting device to control the raising and lowering of the inner ring of the deformation membrane, raises the inner ring of the deformation membrane to its highest position during the oil-gas separation stage, keeping the upper end face horizontal. This ensures that the separation chamber has a stable oil storage and oil-gas separation space, ensuring that the transformer oil is in full contact with the vacuum environment and guaranteeing the efficiency of dissolved gas precipitation. During the oil discharge stage, the inner ring of the deformation membrane is lowered to its lowest position, forming a funnel shape on the upper end face. Utilizing the guiding nature of the funnel structure, and with the opening of the valve body at the lower part of the oil discharge port, the degassed oil in the separation chamber can be completely discharged, avoiding the accumulation and residue of oil at the bottom of the separation chamber. This fundamentally eliminates the problem of residual oil deteriorating and contaminating subsequent oil samples due to prolonged standing, ensuring the purity of each oil sample tested, eliminating the risk of data drift caused by oil accumulation, avoiding misjudgment of faults, and improving the long-term stability and detection accuracy of online monitoring.

[0017] 2. Through the structural design of the deformation membrane combined with the lifting device, flexible switching between the two core processes of oil-gas separation and oil discharge is achieved. The separation state and the oil discharge state do not interfere with each other. This ensures that the oil is stably spread out and the gas is fully extracted during the oil-gas separation process, and enables rapid and thorough oil discharge during the oil discharge process. Overall, this improves the operating efficiency and continuous working capability of the online monitoring system, meets the requirements for long-term uninterrupted online monitoring of transformers, extends the service life of the oil-gas separation module, and reduces the risk of failure during long-term operation of the device.

[0018] 3. By setting up an agitation unit in the separation chamber and using a magnetically driven drive unit to rotate the agitator, the magnetic drive eliminates the need for transmission holes in the inner wall of the separation chamber, ensuring the vacuum sealing of the separation chamber and preventing vacuum leakage from causing a decrease in gas evolution efficiency. At the same time, the agitation unit gently agitates the transformer oil during the vacuum gas evolution process, breaking the static balance inside the oil and promoting the rapid evolution of deeply dissolved gases. This solves the problem of incomplete gas evolution relying solely on vacuum static setting, further improving the accuracy and reliability of oil-gas separation, ensuring that the test results truly reflect the transformer's operating status, and reducing the probability of missed fault detection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an online detection system for dissolved gases in transformer oil according to the present invention.

[0020] Figure 2 This is a three-dimensional schematic diagram of the oil-gas separation module in an online detection system for dissolved gases in transformer oil according to the present invention.

[0021] Figure 3 This is a side view of the oil-gas separation module in an online detection system for dissolved gases in transformer oil according to the present invention.

[0022] Figure 4 This invention relates to an online detection system for 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 the oil-gas separation module in an online detection system for dissolved gases in transformer oil according to the present invention.

[0024] Figure 6 This invention relates to an online detection system for dissolved gases in transformer oil. Figure 5 A magnified view of a portion of point B in the middle.

[0025] Figure 7 This is a partial cross-sectional three-dimensional schematic diagram of the oil-gas separation module in the online detection system for dissolved gases in transformer oil of the present invention when it is in the oil discharge stage.

[0026] Figure 8 This is a partial cross-sectional three-dimensional schematic diagram of the oil-gas separation module in the online detection system for dissolved gases in transformer oil of the present invention when the oil-gas separation is in progress.

[0027] The diagram is labeled as follows: 1. Gas optical recognition module; 2. Gas collection module; 3. Transformer cylinder; 4. Oil sample quantitative collection module; 5. Oil-gas separation module; 51. Separation chamber; 52. Deformation membrane; 521. Oil outlet; 522. Valve body; 53. Lifting device; 531. Lifting ring; 532. Lifting rod; 533. Sleeve; 534. Extension ring; 535. Sealing ring; 54. Air extraction port; 55. Oil inlet; 56. Agitation unit; 561. Agitation frame; 562. Drive unit. Detailed Implementation

[0028] 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.

[0029] Reference Figures 1 to 4 A system for online detection of dissolved gases in transformer oil includes a gas optical recognition module 1, a gas collection module 2, a transformer oil cylinder 3, an oil sample quantitative acquisition module 4, and an oil-gas separation module 5. The oil-gas separation module 5 includes: The separation chamber 51 is vertically arranged on one side of the oil sample quantitative acquisition module 4 and is connected to the oil sample quantitative acquisition module 4; The deformation membrane 52 has an annular structure and is disposed inside the separation chamber 51. The separation chamber 51 and the upper part of the deformation membrane 52 together form a separation cavity for storing transformer oil. The inner ring of the deformation membrane 52 is an oil drain port 521, and a valve body 522 is disposed at the lower part of the oil drain port 521. A lifting device 53 is disposed below the deformable membrane 52 and is used to drive the inner ring of the deformable membrane 52 to rise and fall. When the inner ring of the deformable membrane 52 rises to the highest position, the upper end face of the deformable membrane 52 is horizontal. When the inner ring of the deformable membrane 52 falls to the lowest position, the upper end face of the deformable membrane 52 is funnel-shaped. An exhaust port 54 is located at the top of the separation chamber 51 and is connected to the gas collection module 2.

[0030] The existing detection system works as follows: A quantitative oil sample acquisition module 4 is connected to one side of the transformer oil cylinder 3, capable of quantitatively collecting oil from the cylinder. This module 4 is connected to an oil-gas separation module 5, which periodically supplies a quantitative amount of oil to the separation module 5. The upper part of the oil-gas separation module 5 is connected to a gas collection module 2, which is connected to a gas optical recognition module 1. The gas collection module 2 discharges the collected gas into the gas optical recognition module 1 for identification. A vacuum valve is connected to one side of the gas collection module 2. The vacuum pump creates a vacuum environment in the oil-gas separation module 5 and the gas collection module 2, causing dissolved gases in the transformer oil to separate from the oil. When the gas collection module 2 and the oil-gas separation module 5 are connected and a vacuum environment is formed, the gas optical recognition module 1 is disconnected from the gas collection module 2. After the gas collection is completed, the gas collection module 2 and the gas optical recognition module 1 are reconnected. The separated gas enters the gas optical recognition module 1 through the gas collection module 2, while the transformer oil remaining in the oil-gas separation module 5 is discharged and flows back to the transformer oil cylinder 3.

[0031] The specific working process of the oil-gas separation module 5 in this invention is as follows: After the system is started, the gas collection module 2, in conjunction with an external vacuum pump, evacuates the gas inside the separation chamber through the evacuation port 54 to create a vacuum environment. Subsequently, the oil sample quantitative collection module 4 quantitatively collects the transformer oil to be tested from the transformer oil cylinder 3 and delivers the quantitative oil to the separation chamber 51 connected to it. At this time, the deformation membrane 52 inside the separation chamber 51 is in working condition. The upper surface of the deformation membrane 52 remains horizontal, and the separation chamber formed by the upper part of the deformation membrane 52 and the separation chamber 51 is in a stable oil storage state. The quantitative transformer oil is retained in the separation chamber and is in a flat state, so that the dissolved gas in the transformer oil is fully extracted. The evacuation port 54 at the top of the separation chamber 51 is connected to the gas collection module 2, and the extracted gas is extracted through the evacuation port 54. The gas enters the gas collection module 2 through port 54, and is then transported by the gas collection module 2 to the gas optical recognition module 1 to complete gas recognition and detection, realizing online monitoring and fault early warning of the transformer's working status. After the oil-gas separation operation is completed, the inner ring of the deformation membrane 52 is driven to the lowest position by the lifting device 53. At this time, the upper surface of the deformation membrane 52 changes from a horizontal shape to a funnel shape. Then, by the preset control program, the valve body 522 at the bottom of the oil outlet 521 is opened by the controller. The transformer oil that has been degassed in the separation chamber is guided by the funnel-shaped deformation membrane 52 and quickly discharged from the oil outlet 521 and flows back into the transformer oil cylinder 3, completing the single oil sample detection and oil return process. Subsequently, a quantitative amount of oil can be periodically delivered through the oil sample quantitative acquisition module 4 to repeat the above process to achieve continuous online detection.

[0032] In summary, this invention solves the core problem of oil residue at the bottom of traditional oil-gas separation modules 5. By setting an annular deformation membrane 52 inside the separation chamber 51 and using a lifting device 53 to control the raising and lowering of the inner ring of the deformation membrane 52, the inner ring of the deformation membrane 52 is raised to its highest position during the oil-gas separation stage, keeping the upper end face horizontal. This ensures that the separation chamber has a stable oil storage and oil-gas separation space, ensuring that the transformer oil is in full contact with the vacuum environment and guaranteeing the efficiency of dissolved gas precipitation. During the oil discharge stage, the inner ring of the deformation membrane 52 is lowered to its lowest position, forming a funnel shape at the upper end face. Utilizing the guiding nature of the funnel structure, and with the opening of the valve body 522 at the lower part of the oil discharge port 521, the degassed oil in the separation chamber can be completely discharged, avoiding the accumulation of oil residue at the bottom of the separation chamber 51. This fundamentally eliminates the problem of residual oil deteriorating and contaminating subsequent oil samples after prolonged standing, ensuring the purity of each oil sample tested, eliminating the risk of data drift caused by oil accumulation, avoiding misjudgment of faults, and improving the long-term stability and detection accuracy of online monitoring.

[0033] Secondly, through the structural design of the deformation membrane 52 in conjunction with the lifting device 53, the two core processes of oil-gas separation and oil discharge are flexibly switched. The separation state and the oil discharge state do not interfere with each other. This ensures that the oil is stably spread out and the gas is fully extracted in the oil-gas separation process, and also enables rapid and thorough oil discharge in the oil discharge process. Overall, this improves the operating efficiency and continuous working capability of the online detection system, meets the requirements of long-term uninterrupted online monitoring of transformers, extends the service life of the oil-gas separation module 5, and reduces the risk of failure during long-term operation of the device.

[0034] Reference Figure 5 When the deformation membrane 52 is horizontal, the ratio of the height of the rated amount of transformer oil stored in the separation chamber to the diameter of the separation chamber is less than 0.1.

[0035] When the deformation membrane 52 is in a horizontal working state and the separation chamber forms a stable oil-gas separation space, after the rated amount of transformer oil enters the separation chamber, the oil will be evenly spread on the upper surface of the deformation membrane 52 in a relatively thin state due to the ratio of oil height to separation chamber diameter. This greatly expands the contact area between the transformer oil and the vacuum environment inside the separation chamber. During the vacuum gas extraction and gas separation process, the dissolved gas inside the oil can be extracted from the oil more quickly and fully, effectively improving the rate and thoroughness of oil-gas separation. This avoids the problem of incomplete gas extraction and inaccurate detection results due to excessive oil thickness. At the same time, it is compatible with the quantitative oil inlet working logic and does not affect the subsequent deformation and oil discharge process of the deformation membrane 52, further ensuring the efficiency and accuracy of online detection.

[0036] Reference Figure 6 The deformable membrane 52 has multiple layers.

[0037] To address the technical issues of insufficient strength of the single-layer deformation membrane 52 and its susceptibility to damage and oil leakage under long-term oil pressure and repeated lifting deformation, the deformation membrane 52 is designed as a multi-layer structure. The multi-layer structure significantly improves the overall structural strength and elastic durability of the deformation membrane 52. During the oil-gas separation stage, it withstands the pressure of a metered transformer oil, and during the oil discharge stage, it repeatedly undergoes lifting deformation following the lifting device 53, preventing the breakage and cracking issues common in single-layer structures. Simultaneously, it enhances the sealing performance of the deformation membrane 52, eliminating the problem of transformer oil leakage from the separation chamber through structural gaps. This avoids issues such as damage to the vacuum environment of the separation chamber and oil contamination caused by oil leakage, extending the service life of the deformation membrane 52, ensuring the long-term stable operation of the oil-gas separation module 5, eliminating the need for frequent replacement of core components, and reducing system maintenance costs.

[0038] The deformation membrane 52 has at least a double-layer structure, but can also have three or four layers.

[0039] Reference Figure 6 The inner layer of the deformation film 52 that is in contact with the transformer oil is made of an oleophobic elastic material.

[0040] The oleophobic elastic material itself possesses the property of not adhering to oil while retaining elastic deformation capability. This allows it to work in conjunction with the multi-layer structure to ensure the overall strength and deformation performance of the deformation membrane 52. Furthermore, during the oil drainage stage, when the deformation membrane 52 is funnel-shaped, it allows the degassed transformer oil to completely slide down and drain along the inner oleophobic layer, preventing oil from adhering to the surface of the deformation membrane 52. This eliminates the possibility of trace oil residue deterioration and contamination of subsequent oil samples, further addressing the issues of oil accumulation and data drift at the material level. Simultaneously, the oleophobic material does not affect the uniform spreading of oil during the oil-gas separation stage, balancing gas separation efficiency and thorough oil drainage. The preferred oleophobic elastic material is polydimethylsiloxane. Polydimethylsiloxane, with its smooth surface, possesses both oleophobicity and elasticity. In this invention, the inner surface of the deformation membrane 52 is smooth.

[0041] As a supplement, fluorine-modified thermoplastic polyurethane, perfluorinated elastomer film, elastomer composite nano-coating film, etc. can also be selected as deformation film 52. All of the above materials have both oleophobic and elastic functions.

[0042] Reference Figure 8 The lifting device 53 includes a lifting ring 531 fixedly disposed between the oil drain port 521 and the valve body 522.

[0043] The lifting device 53 also includes a lifting rod 532, a sleeve 533, and a pump body. The lifting rod 532 is vertically installed at the bottom of the lifting ring 531, and the sleeve 533 is vertically installed at the bottom of the separation chamber 51. The lower end of the lifting rod 532 extends into the sleeve 533 and slides within it. The pump body is connected to the bottom of the sleeve 533, allowing it to either expel air from the sleeve 533 or inject air into it, thus enabling the lifting rod 532 to drive the lifting ring 531 to rise and fall. It is worth noting that when the lifting ring 531 rises and falls, an inflation space is formed between the lifting ring 531 and the deformation membrane 52. However, there is a gap between the outer ring of the lifting ring 531 and the inner wall of the separation chamber 51, meaning there is a gap between the outer ring of the lifting ring 531 and the inner wall of the separation chamber 51. Therefore, the inflation space is connected to the outside air, and no negative pressure is generated in the inflation space when the lifting ring 531 rises and falls. However, when the inner ring of the deformable membrane 52 is at its highest position, due to the sealing ring 535 on the lifting ring 531 and the extension ring 534 on the inner wall of the separation chamber 51, the sealing ring 535 and the extension ring 534 are tightly fitted together. The lifting ring 531 exerts upward pressure on the extension ring 534 through the sealing ring 535, thereby completing the sealing of the inflation space. Since the inflation space is connected to the outside air during the rising process of the lifting ring 531, the air in the inflation space can pass through the lifting ring 531 when the lifting ring 531 rises. The gap between the sealing ring 535 and the extension ring 534 is drained to the outside. When the sealing ring 535 and the extension ring 534 are tightly fitted, only a very small amount of air remains in the inflation space. This is because the upper end of the lifting ring 531 is in contact with the lower end of the deformation membrane 52. When the vacuum pump acts on the separation chamber and forms a vacuum environment, the very small amount of air remaining in the inflation space cannot affect the deformation membrane 52, and will not cause the deformation membrane 52 to bulge upward. When the inner ring of the deformation membrane 52 is at its lowest position, the lifting rod 532 is completely retracted into the sleeve 533.

[0044] Before oil-gas separation, the pump body injects air into the sleeve 533, pushing the lifting rod 532 inside the sleeve 533 to slide upward, which in turn drives the lifting ring 531 at the top to rise synchronously, lifting the inner ring of the deformable membrane 52 to the highest position. The lifting ring 531 provides stable bottom support for the deformable membrane 52, preventing the deformable membrane 52 from bulging downward under pressure after the metered oil is injected, and ensuring that the upper surface of the deformable membrane 52 remains horizontal. When draining oil after oil-gas separation, the pump body extracts the air from the sleeve 533, and the lifting rod 532 slides downward under the action of air pressure and retracts completely into the sleeve 533, driving the lifting ring 531 to descend, which in turn pulls the inner ring of the deformable membrane 52 down to the lowest position, so that the deformable membrane 52 forms a funnel shape to complete the oil drainage. The entire lifting structure is pneumatically driven, with smooth operation and rapid response. The lifting ring 531 is directly connected to the inner ring of the deformation membrane 52, ensuring precise and lag-free transmission. At the same time, the fitting structure of the sealing ring 535 and the extension ring 534 ensures the stability of the deformation membrane 52 during the lifting process. It is fully adaptable to the process switching of oil-gas separation and oil discharge, ensuring the stable operation of the core process.

[0045] Reference Figure 6 The lifting device 53 further includes: An extension ring 534 is fixedly disposed on the inner wall of the separation chamber 51 along the axis of the separation chamber 51, and the extension ring 534 is located below the deformation membrane 52. A sealing ring 535 is disposed on the upper part of the lifting ring 531, and the sealing ring 535 is coaxial with the lifting ring 531.

[0046] The extension ring 534 is fixed to the inner wall of the separation chamber 51 and located below the deformation membrane 52, coaxially corresponding to the lifting ring 531. When the lifting ring 531 drives the inner ring of the deformation membrane 52 to the highest position, the sealing ring 535 on the upper part of the lifting ring 531 simultaneously moves upward and tightly fits against the lower end of the extension ring 534, forming a complete sealing and isolation structure. This completely isolates the space below the deformation membrane 52 from the outside air, preventing the external atmospheric pressure from squeezing the deformation membrane 52 upward and causing it to bulge and deform when a vacuum environment is formed inside the separation chamber. This would disrupt the flat distribution of the transformer oil in the separation chamber, ensuring that the oil is always evenly spread during the oil-gas separation process and maintaining a stable vacuum gas separation environment. At the same time, the sealing structure does not affect the normal lifting and lowering action of the lifting ring 531. During the oil discharge stage, the lifting ring 531 descends, and the sealing ring 535 separates from the extension ring 534, without hindering the deformation of the deformation membrane 52, further ensuring the vacuum sealing performance and oil-gas separation efficiency of the separation chamber.

[0047] Reference Figure 6 The separation chamber has an oil inlet 55 on its side wall for transformer oil to enter, and the oil inlet 55 is located in the lower layer of the separation chamber.

[0048] The oil inlet 55 is located on the lower layer of the side wall of the separation chamber, near the bottom area of ​​the deformation membrane 52 when it is in a horizontal state. When the oil sample quantitative collection module 4 delivers quantitative transformer oil, the oil slowly flows into the separation chamber from the lower oil inlet 55 and spreads smoothly along the upper surface of the deformation membrane 52. This prevents splashing caused by the oil falling from a height, avoiding splashed oil adhering to the top of the separation chamber 51 or the air extraction port 54, which would affect the construction of the vacuum environment. At the same time, it ensures that the oil spreads quickly and evenly, reduces the waiting time during the oil inlet process, improves the continuity of the overall detection process, and also prevents oil loss and internal contamination caused by oil splashing, ensuring a clean internal environment of the separation chamber.

[0049] Reference Figure 7 The separation chamber is equipped with an agitation unit 56 for stirring the transformer oil.

[0050] During the vacuum gas separation process, the stirring unit 56 continuously and gently stirs the transformer oil spread on the deformation film 52, breaking the static equilibrium inside the oil and allowing the dissolved gases trapped deep within to quickly move to the surface of the oil. Under vacuum, these gases are then fully separated, solving the problems of low efficiency and gas residue caused by relying solely on vacuum static separation. This further improves the thoroughness of oil-gas separation, ensuring that the test results accurately reflect the dissolved gas content in the transformer oil and avoiding missed faults due to insufficient gas separation. At the same time, the stirring action is gentle, without disrupting the spread of the oil or affecting the vacuum environment of the separation chamber, thus adapting to the stable operation logic of the entire system.

[0051] Reference Figure 8 The stirring unit 56 includes: The stirring frame 561 is rotatably disposed in the separation chamber in a vertical direction; A drive unit 562 is disposed on one side of the agitator 561 and is used to drive the agitator 561 to rotate.

[0052] The agitator 561 is vertically rotatable inside the separation chamber, and its rotation trajectory is aligned with the upper surface of the deformation membrane 52 in a horizontal state. This ensures that the transformer oil in the separation chamber is fully covered. The drive unit 562 serves as the power source, stably driving the agitator 561 to rotate at a low and uniform speed. During the agitation process, no violent disturbances are generated. It only breaks up the static film on the surface of the oil, promoting the precipitation of deep gas. It does not affect the flat distribution of the metered oil or the normal deformation of the deformation membrane 52. At the same time, the layout of the rotating parts is reasonable, avoiding interference with the oil inlet, gas extraction, and oil outlet processes. This ensures that the agitation function works in coordination with other core processes, further optimizing the gas precipitation effect.

[0053] Reference Figures 1 to 8 The driving unit 562 is magnetically driven.

[0054] The drive unit 562 is driven by magnetic force because if the drive unit 562 uses gear transmission or belt transmission, it would be difficult to create a vacuum environment in the separation chamber 51. The drive unit 562 includes multiple electromagnets that can be energized in sequence. The stirring frame 561 is also equipped with magnetic pieces that can be attracted by the electromagnets. When the electromagnets in the drive unit 562 are energized one by one, the magnetic pieces on the stirring frame 561 can be attracted, thereby driving the stirring frame 561 to rotate.

[0055] Magnetic drive eliminates the need for transmission holes in the inner wall of separation chamber 51, avoiding sealing leaks caused by mechanical transmission structures such as gears and belts. This ensures complete vacuum sealing of the separation chamber and solves the problems of vacuum leakage and reduced gas evolution efficiency caused by mechanical transmission. Magnetic drive rotates the stirring frame 561 in the air via magnetic force, eliminating internal mechanical transmission friction and preventing impurities from contaminating the transformer oil. It also provides smooth and noiseless operation and precise control of the stirring frame 561's speed, meeting the gentle stirring requirements of vacuum gas evolution. This achieves efficient stirring and gas evolution without disrupting the core vacuum working environment of the system, balancing functional practicality and sealing reliability, and meeting the sealing requirements of long-term online monitoring.

[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. An online detection system for dissolved gases in transformer oil, comprising a gas optical recognition module (1), a gas collection module (2), a transformer oil cylinder (3), an oil sample quantitative acquisition module (4), and an oil-gas separation module (5); Its features are, The oil-gas separation module (5) includes: The separation chamber (51) is vertically arranged on one side of the oil sample quantitative acquisition module (4) and is connected to the oil sample quantitative acquisition module (4); The deformation membrane (52) has an annular structure and is disposed inside the separation chamber (51). The separation chamber (51) and the upper part of the deformation membrane (52) together form a separation cavity for storing transformer oil. The inner ring of the deformation membrane (52) is an oil drain port (521), and a valve body (522) is disposed at the lower part of the oil drain port (521). A lifting device (53) is provided below the deformation membrane (52) to drive the inner ring of the deformation membrane (52) to rise and fall. When the inner ring of the deformation membrane (52) rises to the highest position, the upper end face of the deformation membrane (52) is horizontal. When the inner ring of the deformation membrane (52) falls to the lowest position, the upper end face of the deformation membrane (52) is funnel-shaped. An exhaust port (54) is located at the top of the separation chamber (51) and is connected to the gas collection module (2).

2. The online detection system for dissolved gases in transformer oil according to claim 1, characterized in that, When the deformation membrane (52) is horizontal, the ratio of the height of the rated amount of transformer oil stored in the separation chamber to the diameter of the separation chamber is less than 0.

1.

3. The online detection system for dissolved gases in transformer oil according to claim 1, characterized in that, The deformable membrane (52) has multiple layers.

4. The online detection system for dissolved gases in transformer oil according to claim 3, characterized in that, The inner layer of the deformable membrane (52) in contact with the transformer oil is made of an oleophobic elastic material.

5. The online detection system for dissolved gases in transformer oil according to claim 1, characterized in that, The lifting device (53) includes a lifting ring (531) fixedly disposed between the oil drain port (521) and the valve body (522).

6. The online detection system for dissolved gases in transformer oil according to claim 5, characterized in that, The lifting device (53) also includes: An extension ring (534) is fixedly disposed on the inner wall of the separation chamber (51) along the axis of the separation chamber (51), and the extension ring (534) is located below the deformation membrane (52); A sealing ring (535) is disposed on the upper part of the lifting ring (531), and the sealing ring (535) is coaxial with the lifting ring (531).

7. The online detection system for dissolved gases in transformer oil according to claim 1, characterized in that, The separation chamber has an oil inlet (55) on its side wall for transformer oil to enter, and the oil inlet (55) is located in the lower layer of the separation chamber.

8. The online detection system for dissolved gases in transformer oil according to claim 1, characterized in that, The separation chamber is equipped with an agitation unit (56) for stirring the transformer oil.

9. The online detection system for dissolved gases in transformer oil according to claim 8, characterized in that, The stirring unit (56) includes: A stirring frame (561) is rotatably disposed in the separation chamber in a vertical direction; A drive unit (562) is disposed on one side of the agitator (561) and is used to drive the agitator (561) to rotate.

10. The online detection system for dissolved gases in transformer oil according to claim 9, characterized in that, The drive unit (562) is magnetically driven.

Images