Transformer insulation state monitoring device and monitoring method

Abstract

The invention relates to the technical field of power transformer monitoring, in particular to a transformer insulation state monitoring device and method.The transformer insulation state monitoring device comprises a circulating cylinder, the lower end and the upper end of the circulating cylinder are provided with a liquid inlet pipe and a liquid outlet pipe respectively, a driving shaft is rotationally arranged in the circulating cylinder, and a filtering disc connected with the driving shaft is rotationally installed in a circulating cavity; a separation monitor corresponding to the filtering disc is arranged on one side of the circulating barrel and comprises a dust collecting hopper arranged in the circulating barrel, one end of the dust collecting hopper penetrates out of the circulating barrel and is provided with a connector, a storage tank is detachably arranged at the bottom of the connector, and a scraping strip making contact with the bottom of the filtering disc is arranged at an opening of the dust collecting hopper. Gas guided into the expansion chamber of the transformer oil tank through the gas inlet pipe and insulating oil form a gas-liquid mixture, bubbles can adsorb small impurities suspended in the oil, escape of the small impurities is greatly reduced in cooperation with the intercepting effect of the filtering disc, and compared with single insulating oil filtering, the impurity separation comprehensiveness is improved.

Description

Technical Field

[0001] This application relates to the technical field of power transformer monitoring, and in particular to a transformer insulation condition monitoring device and method. Background Technology

[0002] Transformers are core equipment in power systems that realize voltage transformation and power transmission. The stability of their internal insulation system directly determines the safety and service life of the equipment. Oil-paper insulation is the mainstream insulation form for transformers, mainly composed of insulating paper, insulating oil, and windings. As a liquid insulating medium, the insulating oil has multiple functions such as insulation, heat dissipation, arc extinguishing, and suppression of partial discharge.

[0003] During long-term operation, transformers are affected by factors such as electric field, temperature, moisture, and oxygen. The insulating oil will gradually oxidize and decompose, and the solid insulation material will age and crack, producing solid impurities such as carbon powder, metal fragments, and sludge, as well as various characteristic gases. These impurities and gases are suspended or dissolved in the insulating oil, which will reduce the oil's insulation strength, increase the risk of partial discharge and overheating, and ultimately lead to a decline in insulation performance, or even equipment failure.

[0004] Existing technologies can continuously collect data during normal transformer operation through online monitoring, compensating for the lag in offline detection. For example, a paper-insulated transformer with monitoring function, as described in application number CN202311171990.0, has several heat dissipation plates and cooling fan boxes on both sides of the transformer chassis. Temperature sensors are used to automatically detect the temperature of the insulating oil and achieve different levels of heat dissipation according to different temperatures. The oil level is automatically monitored and oil is automatically added through a liquid level monitoring system, and the insulating oil is automatically filtered using a filter barrel. The insulation performance monitoring system automatically monitors the paper insulation performance and can transmit the temperature, oil level, and insulation performance of the insulating oil to the cloud wirelessly.

[0005] However, when the aforementioned existing technologies are used to monitor the insulation status of transformers, the sensors are easily affected by external interference signals such as switching operations and electromagnetic radiation in the power system when capturing partial discharge signals, resulting in a high misjudgment rate and difficulty in distinguishing between real discharge signals and interference signals, which affects the reliability of monitoring results.

[0006] The detection of parameters such as dielectric loss, water content, and dissolved gas content of insulating oil mostly relies on periodic sampling analysis or fixed-point monitoring by sensors. This cannot achieve real-time feedback of the oil's condition across the entire range, and it is difficult to capture early trends of insulating oil degradation in a timely manner, which may lead to missing the best intervention opportunity.

[0007] Existing technologies only focus on data acquisition and threshold alarms, lacking in-depth coupling analysis of monitoring data with the intrinsic mechanisms of insulation material aging, partial discharge development, and oil deterioration. This makes it difficult to accurately predict the trend of insulation deterioration and can only issue alarms after a fault occurs, failing to provide early warning of potential risks.

[0008] Based on this, as stated above, there is still room for improvement in the existing technology for monitoring the insulation condition of transformers. Summary of the Invention

[0009] To address the aforementioned technical problems, this application provides a transformer insulation condition monitoring device and method, employing the following technical solution: In a first aspect, a transformer insulation condition monitoring device includes a circulating cylinder, with an inlet pipe and an outlet pipe respectively provided at the lower and upper ends of the circulating cylinder, a drive shaft rotatably disposed inside the circulating cylinder, and a filter disc connected to the drive shaft rotatably installed inside the circulating cylinder, the filter disc being used to intercept impurities in the insulating oil. The circulation cylinder is equipped with a circulation drive component, which is used to transport the mixture of insulating oil and transformer air from the inlet pipe to the outlet pipe to achieve gas-liquid mixing circulation. A separation monitor corresponding to the filter disc is installed on one side of the circulation cylinder. The separation monitor is used to separate and collect impurities on the filter disc and detect the weight increment and type of impurities. The separation monitor includes a dust collection hopper located at the lower end of the filter disc inside the circulation cylinder. One end of the dust collection hopper extends through to the outside of the circulation cylinder and is equipped with a connector. A storage tank is detachably installed at the bottom of the connector. A scraper is installed at the opening of the dust collection hopper to contact the bottom of the filter disc.

[0010] Preferably, the dust collection hopper includes a hopper section and a pipe section, and a conveying component is provided inside the pipe section. The conveying component is used to transport impurities in the hopper section to a storage tank. The conveying component includes a rotating shaft rotatably mounted inside the tube, and helical blades are mounted on the rotating shaft.

[0011] Preferably, a driven gear is provided at one end of the rotating shaft, and a drive gear that meshes with the driven gear is provided on the drive shaft.

[0012] Preferably, the pipe is inclined downwards and outwards from the circulation cylinder.

[0013] Preferably, the connector includes a tube extending through to a cylinder outside the circulation cylinder, a plunger rotatably engaged inside the cylinder, and a flow channel on the plunger corresponding to the tube, the flow channel connecting the tube and the storage tank.

[0014] Preferably, the storage tank includes a tank body that can be detachably installed at the lower end of the connector, a baffle is slidably provided at the bottom of the tank body, and an adjusting screw is rotatably provided at the bottom of the tank body to drive the baffle to slide along the bottom of the tank body.

[0015] Preferably, the circulation drive includes a baffle that slides inside the circulation cylinder. The baffle has a one-way flow port that allows fluid to flow only from bottom to top. The baffle is used in conjunction with the drive shaft to realize the circulation and delivery of fluid.

[0016] Preferably, the baffle divides the inside of the circulation cylinder into an upper circulation chamber and a lower circulation chamber, and the upper circulation chamber and the lower circulation chamber are connected through a one-way flow port; The liquid inlet pipe is located at the bottom of the lower circulation chamber, the liquid outlet pipe is installed at the upper end of the upper circulation chamber, and the air inlet pipe is provided at the bottom of the circulation cylinder, which is connected to the lower circulation chamber.

[0017] Preferably, the drive shaft is provided with a reciprocating thread section located at the lower end of the filter disc. The partition plate is threadedly engaged with the reciprocating thread section. When the drive shaft rotates, it drives the partition plate to slide up and down, which, together with the unidirectional flow port, enables the gas-liquid mixture in the lower circulation chamber to be transported upward to the filter disc.

[0018] Secondly, a method for monitoring the insulation condition of a transformer, the method of use of which includes the following steps: Step 1: Circulation filtration. Start the drive shaft to drive the reciprocating thread section, filter disc and drive gear to rotate synchronously. Through the threaded engagement between the reciprocating thread section and the baffle, the rotational motion is converted into linear motion, driving the baffle to slide up and down along the circulation cylinder. Utilize the pressure difference formed by the up and down sliding of the baffle to draw in the transformer insulating oil through the liquid inlet pipe and push it to the filter disc through the one-way flow port. Step 2: Impurity collection. As the filter disc rotates, the scraper continuously removes impurities intercepted on the surface. Under the combined action of gravity and the spiral blades, the impurities are sent into the storage tank through the dust collection hopper, joint, and plunger channel. The filtered insulating oil flows back to the transformer oil tank through the outlet pipe, completing the closed-loop circulation. Step 3: Impurity detection. After impurities are sent into the storage tank, the sensors simultaneously carry out detection work, accurately count the increase in impurity weight within the period, and identify the types of impurities through image recognition and spectral analysis. Step 4: Sampling and maintenance. Rotate the plunger and adjust the baffle to double-seal the insulating oil. Remove the old storage tank and tighten the cap to prevent leakage. Replace the tank with a new one pre-filled with insulating oil and then reset the components. The insulating oil must be sealed before sensor maintenance. After inspection and calibration, seal and install the device to ensure it returns to normal operation.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention introduces gas into the expansion chamber of the transformer oil tank through an air inlet pipe, forming a gas-liquid mixture with the insulating oil. The bubbles can adsorb fine impurities suspended in the oil, and with the interception effect of the filter disc, the escape of tiny impurities is greatly reduced. Compared with single insulating oil filtration, the comprehensiveness of impurity separation is improved.

[0020] Meanwhile, the gas flow can reduce the viscosity of the insulating oil. Combined with the pressure difference conveying through the sliding of the partition and the directional pushing of the spiral blades, it can prevent impurities from accumulating, ensure the continuity of filtration and collection, and the static insulating oil environment can further prevent impurities from drifting away with the oil flow, thus improving the accuracy of collection.

[0021] 2. The present invention integrates the drive shaft to drive the filter disc, reciprocating thread section and drive gear, without the need for an additional power source. This simplifies the structure and reduces energy consumption, and achieves synchronous linkage of circulating filtration, impurity scraping and conveying, thereby improving the overall operating efficiency of the device.

[0022] The gas-liquid mixing and circulation reduces the deposition of impurities caused by the static storage of insulating oil, ensuring a uniform distribution of insulating oil and deterioration products. This avoids the accumulation of local impurities affecting the detection accuracy and adapts to the transformer insulation monitoring needs under different operating conditions.

[0023] 3. This invention removes impurities from insulating oil through efficient filtration and timely discharges characteristic gases generated by insulation deterioration, thereby reducing the erosion of transformer insulation materials by impurities and gaseous deterioration products, lowering the risk of partial discharge, slowing down the aging rate of insulation, and extending the service life of the transformer.

[0024] At the same time, accurate early warning of potential faults enables preventive maintenance, avoiding major losses caused by the escalation of faults and significantly reducing overall maintenance costs. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram from the first perspective of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the present invention.

[0027] Figure 3 This is a schematic diagram of the filter disc and separation monitor of the present invention.

[0028] Figure 4 This is a cross-sectional view of the filter disc of the present invention.

[0029] Figure 5 This is a cross-sectional view of the separation monitor of the present invention.

[0030] Figure 6 This is the present invention. Figure 5 Enlarged view of a portion of point A in the middle.

[0031] Figure 7 This is a schematic diagram of the joint and storage tank of the present invention.

[0032] Figure 8 This is a schematic diagram of the structure of the storage tank of the present invention.

[0033] Figure 9 This is a schematic diagram of the structure of the cyclic drive component of the present invention.

[0034] Explanation of reference numerals in the attached drawings: 1. Circulation cylinder; 11. Inlet pipe; 12. Outlet pipe; 13. Air inlet pipe; 2. Drive shaft; 3. Filter disc; 4. Circulation drive component; 41. Baffle plate; 42. One-way flow port; 43. Upper circulation chamber; 44. Lower circulation chamber; 45. Reciprocating threaded section; 5. Separation monitor; 6. Dust collection hopper; 61. Hopper section; 62. Pipe section; 63. Scraper; 7. Conveying component; 71. Rotating shaft; 72. Spiral blade; 73. Driven gear; 74. Drive gear; 8. Connector; 81. Cylinder section; 82. Plunger; 83. Flow channel; 9. Storage tank; 91. Tank body; 92. Baffle plate; 93. Adjusting screw; 94. Tank cover. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1 to 9 This application will be described in further detail.

[0036] This application discloses a transformer insulation condition monitoring device and method. Through the mixing and circulating filtration of insulating oil, gas and liquid, simultaneous scraping and conveying of impurities, and precise detection in the storage tank, combined with a convenient maintenance structure of double sealing and detachable storage tank, the device achieves efficient monitoring of transformer insulation condition and safe operation and maintenance.

[0037] Example 1: Reference Figure 1 and 2 As shown, a transformer insulation condition monitoring device includes a circulation cylinder 1. The lower end of the circulation cylinder 1 is provided with an inlet pipe 11 connected to the bottom of the transformer oil tank for introducing insulating oil from the transformer oil tank into the circulation cylinder 1. The upper end of the circulation cylinder 1 is provided with an outlet pipe 12 connected to the top of the transformer oil tank for returning the filtered insulating oil to the transformer oil tank. Both the inlet pipe 11 and the outlet pipe are provided with one-way valves.

[0038] A drive shaft 2 is rotatably installed inside the circulation cylinder 1, and a filter disc 3 connected to the drive shaft 2 is rotatably installed inside the circulation cylinder 1. The filter disc 3 is used to intercept impurities in the insulating oil and to drive the filter disc 3 to rotate synchronously. The outlet pipe 12 is located above the filter disc 3. A circulation drive component 4 is provided on the circulation cylinder 1 to provide power for fluid transportation. The circulation drive component 4 is used to transport the insulating oil from the inlet pipe 11 to the outlet pipe 12 to realize the circulation of the insulating oil.

[0039] During operation, the circulation drive 4 is activated to generate fluid transport power, drawing the insulating oil from the transformer into the circulation chamber of the circulation cylinder 1 through the inlet pipe 11 (connected to the bottom of the transformer tank). Simultaneously, air from the transformer itself is drawn in, and the two combine to form insulating oil within the circulation chamber. The drive shaft 2 rotates synchronously, causing the filter disc 3, which is installed within the circulation chamber and located in the upper circulation chamber 43, to rotate as well. Because the outer diameter of the filter disc 3 matches the inner diameter of the upper circulation chamber 43, the insulating oil cannot flow around the gap between the filter disc 3 and the upper circulation chamber 43; it must all pass through the filter disc 3.

[0040] During the process of insulating oil flowing through filter disc 3, impurities contained therein are precisely intercepted by filter disc 3, achieving separation of impurities from insulating oil. After filtration, the insulating oil continues to flow upward, and after reaching the upper end of circulation cylinder 1, it flows back to transformer oil tank through the outlet pipe 12 located above filter disc 3 (connected to the top of transformer oil tank), ultimately achieving closed-loop circulation and impurity collection of insulating oil.

[0041] A separation monitor 5 corresponding to the filter disc 3 is installed on one side of the circulation cylinder 1. The separation monitor 5 works synchronously to separate and collect impurities on the filter disc 3, and detects the weight increase and type of impurities. The detection data of impurities by the separation monitor 5 can be used as a basis for judging the insulation status of the transformer.

[0042] By separating and collecting the impurities intercepted on filter disc 3, the total amount of impurities collected in each cycle is counted sequentially according to the same set time period. The actual amount of impurities in the current cycle is calculated by subtracting the total amount of impurities in the previous cycle from the total amount of impurities in the current cycle. At the same time, the types of impurities in the corresponding cycle are detected. Finally, based on the trend of the actual amount of impurities in a single cycle and the types of impurities, the operating status of the insulating oil is determined.

[0043] Reference Figure 3 and 4 As shown, specifically, the separation monitor 5 includes a dust collection hopper 6 installed inside the circulation cylinder 1, and the dust collection hopper 6 is located at the lower end of the filter disc 3, serving as the initial collection component after impurities are scraped off; a scraper 63 is installed at the opening of the dust collection hopper 6 and keeps in contact with the bottom of the filter disc 3; one end of the dust collection hopper 6 extends through to the outside of the circulation cylinder 1 and is provided with a connector 8, and a storage tank 9 is detachably installed at the bottom of the connector 8, which is the final collection and storage location for impurities.

[0044] As the filter disc 3 rotates with the drive shaft 2, the scraper 63, which is in continuous contact with its bottom, simultaneously scrapes the surface of the filter disc 3, removing the insulating oil impurities intercepted on the filter disc 3. Under the action of gravity, the scraped impurities fall into the dust collection hopper 6, which is located at the lower end of the filter disc 3 and is filled with insulating oil. The dust collection hopper 6, the connector 8, and the storage tank 9 are all filled with insulating oil and connected. The insulating oil is uniformly in a relatively static state inside the three, and the impurities will settle and collect in the static insulating oil.

[0045] The collected impurities are transported through the dust collection hopper 6 to the connector 8, which is filled with static insulating oil outside the circulating cylinder 1, and finally enter the storage tank 9, which is also filled with static insulating oil, to complete the collection and storage. This provides physical samples for the subsequent statistics of impurity quantity, difference calculation and impurity type detection in each cycle. During the entire impurity collection process, the fullness and relative stillness of the insulating oil can prevent impurities from drifting with the oil flow and ensure the accuracy of collection.

[0046] Reference Figure 5 and 6 As shown, the dust collection includes a hopper 61 and a pipe 62. The hopper 61 receives the scraped impurities, and the pipe 62 is an impurity conveying channel. The pipe 62 is inclined downwards and outwards from the outside of the circulation cylinder 1, and the impurities are conveyed to the storage tank 9 under the combined action of gravity and the conveying component 7. The conveying component 7 is provided inside the pipe 62, and the conveying component 7 is used to convey the impurities in the hopper 61 to the storage tank 9.

[0047] Specifically, the conveying component 7 includes a rotating shaft 71 rotatably disposed inside the tube 62, and a spiral blade 72 disposed on the rotating shaft 71 that rotates synchronously with the rotating shaft 71 to achieve directional conveying of impurities by pushing in the direction of rotation; a driven gear 73 is disposed at one end of the rotating shaft 71, and a drive gear 74 is disposed on the drive shaft 2 and meshes with the driven gear 73.

[0048] Because the pipe section 62 of the dust collection hopper 6 is inclined downwards and outwards from the circulation cylinder 1, the impurities collected in the hopper section 61 will naturally slide and converge towards the pipe section 62 under the action of gravity. At the same time, when the drive shaft 2 rotates, it drives the drive gear 74 on it to rotate synchronously. The drive gear 74 meshes with the driven gear 73 at the end of the rotating shaft 71, transmitting power to the rotating shaft 71, causing the rotating shaft 71 in the pipe section 62 to drive the spiral blades 72 to rotate. The rotation of the spiral blades 72 generates a directional pushing force, which works synergistically with the inclined gravity of the pipe section 62 to stably and directionally transport the impurities in the hopper section 61 to the end of the pipe section 62, and then send them into the storage tank 9 through the connector 8.

[0049] Throughout the process, the insulating oil fills the hopper 61, pipe 62, joint 8, and storage tank 9 and remains relatively stationary. The active pushing of the conveyor 7, combined with gravity assistance, effectively promotes the sedimentation and transport of impurities in the stationary insulating oil, preventing impurities from accumulating in the pipe 62 and ensuring the continuity and integrity of impurity collection.

[0050] Reference Figure 7As shown, the connector 8 includes a tube 62 with one end extending through a cylinder 81 outside the circulation cylinder 1. A plunger 82 is rotatably engaged inside the cylinder 81 and can rotate relative to the cylinder 81. The plunger 82 has a flow channel 83 corresponding to the tube 62, which is a flow channel for impurities and insulating oil. The flow channel 83 can form a corresponding fit with the tube 62 of the dust collection hopper 6, connecting the tube 62 of the dust collection hopper 6 with the storage tank 9, so as to realize the directional transportation of impurities.

[0051] A sensor (existing detection technology) is installed on the plunger 82. The sensor is detachably installed on the plunger 82 through a sealing thread, passes through the plunger 82 and extends into the storage tank 9, and comes into direct contact with the insulating oil and impurities in the storage tank 9 (adapted to oil-resistant design). The storage tank 9, the flow channel 83 of the plunger 82, the cylinder 81 of the connector 8 and the dust collection hopper 6 are all filled with insulating oil and are in a relatively static state, providing a stable environment for sensor detection.

[0052] When impurities are transported to storage tank 9 through dust collection hopper 6 pipe 62 and plunger 82 flow channel 83, the weight sensor collects the total weight of impurities and corresponding insulating oil in storage tank 9 in real time. By using the preset insulating oil weight parameter (the weight of insulating oil is constant under a fixed volume), the weight of insulating oil is deducted to obtain the net weight of impurities. Then, by subtracting the net weight of impurities from the previous period from the net weight of impurities in the current period, the increase in impurity weight in this period is calculated.

[0053] Simultaneously, the sensor works to collect the microscopic morphology of impurities and uses image recognition algorithms to distinguish the appearance characteristics of different impurities; the near-infrared spectral sensor emits near-infrared light and analyzes the spectral absorption characteristics of impurities to determine the impurity composition, thereby accurately identifying the types of impurities such as carbon powder, metal powder, and sludge.

[0054] The connection structure facilitates the later maintenance, calibration and replacement of the sensor, and ensures sealing performance to prevent insulation oil leakage from affecting the detection stability. The two sensors work together (or one can be used at a time) to accurately detect the increase in weight and type of impurities in the storage tank 9, providing data support for subsequent judgment of the transformer insulation oil condition and analysis of insulation degradation.

[0055] The plunger 82 can rotate 180 degrees around its own axis. After rotation, it can block the pipe 62 of the dust collection hopper 6, so that the flow channel 83 is away from the direction of the pipe 62, blocking the connection between the insulating oil and the storage tank 9. At this time, the storage tank 9 can be safely disassembled to carry out cleaning operations such as sampling. Before disassembling the sensor, the same plunger 82 rotation and blocking steps must be performed to avoid the leakage of insulating oil, which would pollute the environment or affect the operation of the equipment.

[0056] Reference Figure 7 and 8As shown, the storage tank 9 includes a tank body 91 that can be detachably installed at the lower end of the connector 8. A baffle 92 is slidably provided at the bottom of the tank body 91. An adjusting screw 93 is rotatably provided at the bottom of the tank body 91 to drive the baffle 92 to slide along the bottom of the tank body 91. A space is reserved between the bottom of the baffle 92 and the tank body 91.

[0057] When sampling or cleaning the storage tank 9 is required, the plunger 82 must first be rotated 180 degrees to seal the dust collection hopper 6 pipe 62 and the flow channel 83 away from the pipe 62, thus blocking the connection between the insulating oil and the storage tank 9. The adjusting screw 93 can be rotated to drive the baffle 92 to slide downward along the bottom of the tank body 91. The space reserved between the bottom of the baffle 92 and the tank body 91 is used to expand the interior of the tank body 91, allowing the insulating oil in the connector 8 to flow smoothly into the tank body 91. At the same time, it is convenient for impurities to enter the tank body 91 with the insulating oil for collection. This avoids the situation where the tank body 91 and the cylinder 81 of the connector 8 are both filled with insulating oil. If the plunger 82 sealing and the baffle 92 auxiliary control operation are not performed, directly disassembling the tank body 91 may easily lead to leakage of the insulating oil in the cylinder 81, causing pollution and potential equipment operation hazards.

[0058] The canister 91 is equipped with a removable cap. After the canister 91 is disassembled, the removable cap should be immediately closed to prevent leakage of insulating oil inside the canister. Then, a new canister 91 is installed on the connector 8, and the flow channel 83 is opened to ensure continuous impurity collection and detection. The new canister 91 is pre-filled with insulating oil and sealed with a cap, which can avoid the reduction of the overall amount of insulating oil due to multiple sampling and canister replacement operations, and ensure the stability of the device's detection environment. After the replacement is completed, impurity collection and detection can be resumed.

[0059] Reference Figure 9 As shown, specifically, the circulation drive component 4 includes a partition 41 that is slidably disposed inside the circulation cylinder 1. The partition 41 is provided with a one-way flow port 42, which only allows fluid to flow from bottom to top. The partition 41 is used to cooperate with the drive shaft 2 to realize the circulation and transportation of fluid. The partition 41 divides the inside of the circulation cylinder 1 into an upper circulation chamber 43 and a lower circulation chamber 44. The upper circulation chamber 43 and the lower circulation chamber 44 are connected through the one-way flow port 42, dividing the inside of the circulation cylinder 1 into two independent chambers, and at the same time, it cooperates with the one-way flow port 42 to complete the fluid transportation.

[0060] The drive shaft 2 is provided with a reciprocating thread section 45 located at the lower end of the filter plate 3. The partition plate 41 is threadedly engaged with the reciprocating thread section 45. When the drive shaft 2 rotates, it drives the partition plate 41 to slide up and down, which, together with the one-way flow port 42, enables the insulating oil in the lower circulation chamber 44 to be transported upward to the filter plate 3. The liquid inlet pipe 11 is located at the bottom of the lower circulation chamber 44, and the liquid outlet pipe 12 is installed at the upper end of the upper circulation chamber 43.

[0061] When the drive shaft 2 is driven to rotate, the reciprocating thread section 45 on it rotates synchronously. Since the partition plate 41 is threadedly engaged with the reciprocating thread section 45, the rotational motion is converted into linear motion, causing the partition plate 41 to slide up and down along the inside of the circulation cylinder 1. The partition plate 41 divides the inside of the circulation cylinder 1 into an upper circulation chamber 43 and a lower circulation chamber 44. The two are connected through a one-way flow port 42 on the partition plate 41. The one-way flow port 42 only allows fluid to flow from bottom to top, which can effectively prevent fluid backflow.

[0062] The insulating oil in the transformer is introduced into the lower circulation chamber 44 through the inlet pipe 11. When the partition 41 slides downward, the internal space of the lower circulation chamber 44 increases and the air pressure decreases, and the insulating oil is drawn into the lower circulation chamber 44. When the partition 41 slides upward, the internal space of the lower circulation chamber 44 decreases and the air pressure increases, which pushes the insulating oil in the lower circulation chamber 44 to flow upward and enter the upper circulation chamber 43 through the one-way flow port 42.

[0063] After entering the upper circulation chamber 43, the oil continues to flow upward to the filter plate 3 to intercept impurities, and finally is discharged through the outlet pipe 12 installed at the upper end of the upper circulation chamber 43, realizing the closed-loop circulation and transportation of insulating oil. During the entire circulation process, the up-and-down sliding of the partition plate 41 and the unidirectional conduction characteristics of the one-way flow port 42 work together to ensure the stability and directionality of the insulating oil transportation, and provide continuous fluid dynamic support for subsequent impurity filtration, collection and detection.

[0064] Example 2: Refer to Figure 1 As shown, based on Embodiment 1, the transformer oil tank expansion chamber is connected to the far end of the air inlet pipe 13 and is an auxiliary structure of the transformer oil tank. It is used to contain the gas discharged when the insulating oil is heated and expanded during transformer operation, and to provide a stable gas source for the air inlet pipe 13.

[0065] The bottom of the circulation cylinder 1 is equipped with an air inlet pipe 13, and a one-way valve is installed on the air inlet pipe 13 to allow air to enter the circulation cylinder 1. One end is connected to the lower circulation chamber 44 inside the circulation cylinder 1, and the other end is connected to the expansion chamber of the transformer oil tank. This is the channel for the gas in the expansion chamber of the transformer oil tank to be introduced into the lower circulation chamber 44. This is adapted to the installation layout of the circulation cylinder 1 and the transformer oil tank to ensure the sealing and stability of the gas transportation.

[0066] When the transformer is running, the insulating oil expands due to heat and releases gas. This gas is collected in the expansion chamber of the transformer tank and is stably introduced into the lower circulation chamber 44 of the circulation cylinder 1 through the guiding effect of the air inlet pipe 13.

[0067] The gas introduced into the lower circulation chamber 44 will be fully mixed with the insulating oil that enters the lower circulation chamber 44 through the liquid inlet pipe 11 to form a gas-liquid mixture. This provides a gas source for the subsequent circulation drive 4 to push the fluid upward, complete the filtration and circulation process, and at the same time, it can help remove some of the tiny impurities in the insulating oil, indirectly improving the efficiency of subsequent impurity filtration. Its interconnected structure ensures the smoothness of gas transportation and avoids the leakage of insulating oil.

[0068] The participation of gas in circulation helps to efficiently separate impurities. The gas forms tiny bubbles in the insulating oil, which can adsorb fine impurity particles suspended in the oil. It flows together with the gas-liquid mixture, improving the interception effect of filter disc 3 on impurities. This allows more impurities caused by insulation deterioration to be collected, providing a more comprehensive sample for the statistical analysis of impurity weight increment and the detection of types, helping to accurately determine the degree of insulation oil contamination; and simultaneously reflecting insulation aging and potential faults.

[0069] When transformers are in operation, the insulating oil and solid insulating materials decompose and produce characteristic gases when they age, overheat, or discharge. These gases, along with the gases introduced into the expansion chamber, participate in the circulation and can flow with the insulating oil through subsequent detection stages. By analyzing the types, concentrations, and trends of these characteristic gases, latent faults can be predicted in advance. For example, local overheating will produce ethylene and acetylene, while discharge will produce hydrogen and methane, allowing for accurate determination of the fault type and severity.

[0070] In addition, to optimize monitoring stability, gas-liquid mixing and circulation can reduce impurity deposition caused by static insulation oil, allowing the insulation oil and its deterioration products and impurities to be evenly distributed, avoiding the impact of local impurity accumulation on the accuracy of detection data. At the same time, gas flow can help reduce the viscosity of insulation oil, improve circulation efficiency, and ensure continuous and stable data acquisition by the monitoring device. It also assists in the control of insulation performance. The participation of gas in circulation can reduce the excessive precipitation of dissolved gases in the insulation oil, forming bubbles, and prevent bubbles from reducing the insulation strength of the oil and causing partial discharge. At the same time, circulation can promptly remove gaseous products in the insulation oil that are prone to accelerated aging, indirectly assisting in the assessment of the insulation performance status of the insulation oil, and providing multiple data supports for the comprehensive monitoring of transformer insulation status and fault prediction.

[0071] Finally, the present invention also provides a method for monitoring the insulation condition of a transformer, the method of use of which includes the following steps: Step 1: Circulation filtration. Start the drive shaft 2, which drives the reciprocating thread section 45, filter disc 3 and drive gear 74 to rotate synchronously. Through the threaded engagement between the reciprocating thread section 45 and the partition plate 41, the rotational motion is converted into linear motion, driving the partition plate 41 to slide up and down along the circulation cylinder 1. Utilizing the pressure difference formed by the up and down sliding of the partition plate 41, the insulating oil inside the transformer is drawn in through the liquid inlet pipe 11, and at the same time, the gas in the expansion chamber of the transformer tank is drawn in through the air inlet pipe 13. After the gas and liquid are mixed, they are directionally pushed to the filter disc 3 through the one-way flow port 42.

[0072] Step 2: When the gas-liquid mixture formed by the gas and insulating oil passes through filter plate 3, the bubbles adsorb small impurities in the oil, improve the interception effect of filter plate 3 on impurities, reduce the escape of small impurities, and ensure the comprehensiveness of impurity separation.

[0073] Step 3: Impurity collection. When the filter disc 3 rotates, the scraper 63 continuously scrapes away the impurities intercepted on the surface. Under the combined action of gravity and the push of the spiral blade 72, the impurities are sent into the storage tank 9 through the dust collection hopper 6, the connector 8, and the flow channel 83 of the plunger 82. The filtered insulating oil flows back to the transformer oil tank through the liquid outlet pipe 12, completing the closed-loop circulation.

[0074] Step 4: Impurity detection. After impurities are sent into storage tank 9, the sensors simultaneously carry out detection work, accurately count the increase in impurity weight within the cycle, and identify the types of impurities through image recognition and spectral analysis.

[0075] Step 5: Sampling and maintenance. Rotate plunger 82 and adjust baffle 92 to double-seal the insulating oil. Disassemble the old storage tank 9 and tighten the cap to prevent leakage. Replace with a new tank 91 pre-filled with insulating oil and then reset the components. Insulating oil sealing must be completed before sensor maintenance. After inspection and calibration, the device must be sealed and installed to ensure it returns to normal operation.

[0076] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A transformer insulation condition monitoring device, comprising a circulation cylinder (1), wherein an inlet pipe (11) and an outlet pipe (12) are respectively provided at the lower and upper ends of the circulation cylinder (1), characterized in that: A drive shaft (2) is rotatably installed inside the circulation cylinder (1), and a filter disc (3) connected to the drive shaft (2) is rotatably installed inside the circulation cylinder (1). The filter disc (3) is used to intercept impurities in the insulating oil. A circulation drive (4) is provided on the circulation cylinder (1), which is used to transport the mixture of insulating oil and transformer air from the inlet pipe (11) to the outlet pipe (12). A separation monitor (5) corresponding to the filter disc (3) is provided on one side of the circulation cylinder (1). The separation monitor (5) is used to separate and collect impurities on the filter disc (3) and to detect the weight increment and type of impurities. The separation monitor (5) includes a dust collection hopper (6) located at the lower end of the filter disc (3) inside the circulation cylinder (1). One end of the dust collection hopper (6) extends through to the outside of the circulation cylinder (1) and is provided with a connector (8). A storage tank (9) is detachably provided at the bottom of the connector (8). A scraper (63) is provided at the opening of the dust collection hopper (6) and contacts the bottom of the filter disc (3).

2. The transformer insulation condition monitoring device according to claim 1, characterized in that: The dust collection hopper (6) includes a hopper section (61) and a pipe section (62). A conveying component (7) is provided inside the pipe section (62). The conveying component (7) is used to convey the impurities in the hopper section (61) to the storage tank (9). The conveying component (7) includes a rotating shaft (71) rotatably disposed inside the tube (62), and a spiral blade (72) is disposed on the rotating shaft (71).

3. The transformer insulation condition monitoring device according to claim 2, characterized in that: A driven gear (73) is provided at one end of the rotating shaft (71), and a drive gear (74) that meshes with the driven gear (73) is provided on the drive shaft (2).

4. The transformer insulation condition monitoring device according to claim 2, characterized in that: The tube (62) is inclined to the outside and below the circulation cylinder (1).

5. A transformer insulation condition monitoring device according to claim 2, characterized in that: The connector (8) includes a tube (62) extending through a cylinder (81) outside the circulation cylinder (1). A plunger (82) is rotatably engaged inside the cylinder (81). A flow channel (83) corresponding to the tube (62) is opened on the plunger (82). The flow channel (83) connects the tube (62) and the storage tank (9).

6. The transformer insulation condition monitoring device according to claim 1, characterized in that: The storage tank (9) includes a tank body (91) that can be detachably installed at the lower end of the connector (8). A baffle (92) is slidably provided at the bottom of the tank body (91). An adjusting screw (93) is rotatably provided at the bottom of the tank body (91) to drive the baffle (92) to slide along the bottom of the tank body (91).

7. The transformer insulation condition monitoring device according to claim 1, characterized in that: The circulation drive (4) includes a partition (41) that is slidably disposed inside the circulation cylinder (1). A one-way flow port (42) is provided on the partition (41). The one-way flow port (42) only allows fluid to flow from bottom to top. The partition (41) is used to cooperate with the drive shaft (2) to realize the circulation and transportation of fluid.

8. A transformer insulation condition monitoring device according to claim 7, characterized in that: The partition (41) divides the inside of the circulation cylinder (1) into an upper circulation chamber (43) and a lower circulation chamber (44), and the upper circulation chamber (43) and the lower circulation chamber (44) are connected through a one-way flow port (42); The inlet pipe (11) is located at the bottom of the lower circulation chamber (44), the outlet pipe (12) is installed at the upper end of the upper circulation chamber (43), and the bottom of the circulation cylinder (1) is provided with an air inlet pipe (13), which is connected to the lower circulation chamber (44).

9. A transformer insulation condition monitoring device according to claim 7, characterized in that: The drive shaft (2) is provided with a reciprocating thread section (45) located at the lower end of the filter plate (3). The partition plate (41) is threadedly engaged with the reciprocating thread section (45). When the drive shaft (2) rotates, it drives the partition plate (41) to slide up and down. Together with the one-way flow port (42), the gas-liquid mixture in the lower circulation chamber (44) is transported upward to the filter plate (3).

10. A method for monitoring the insulation condition of a transformer, employing a transformer insulation condition monitoring device as described in any one of claims 1-9, characterized in that, Its usage includes the following steps: Step 1: Circulation filtration. Start the drive shaft (2) to drive the reciprocating thread section (45), filter disc (3) and drive gear (74) to rotate synchronously. Through the threaded engagement between the reciprocating thread section (45) and the partition plate (41), the rotational motion is converted into linear motion, driving the partition plate (41) to slide up and down along the circulation cylinder (1). Utilizing the pressure difference formed by the sliding of the partition plate (41), the insulating oil inside the transformer is drawn in through the liquid inlet pipe (11) and directionally pushed to the filter disc (3) through the one-way flow port (42). Step 2: Impurity collection. When the filter disc (3) rotates, the scraper (63) continuously scrapes away the impurities intercepted on the surface. Under the combined action of gravity and the spiral blade (72), the impurities are sent into the storage tank (9) through the dust collection hopper (6), the joint (8), and the plunger (82) flow channel (83). The filtered insulating oil flows back to the transformer oil tank through the liquid outlet pipe (12) to complete the closed-loop circulation. Step 3: Impurity detection. After the impurities are sent into the storage tank (9), the sensor performs detection work simultaneously, accurately counts the increase in the weight of impurities within the cycle, and identifies the types of impurities through image recognition and spectral analysis. Step 4: Sampling and maintenance. Rotate the plunger (82) and adjust the baffle (92) to double-seal the insulating oil. Remove the old storage tank (9) and tighten the cap to prevent leakage. Replace the new tank (91) with pre-filled insulating oil and then reset the components. Before sensor maintenance, the insulating oil must be sealed. After inspection and calibration, seal and install to ensure that the device returns to normal operation.

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