An on-line monitoring device for oil-immersed transformer and a monitoring method thereof

Abstract

This invention relates to an online monitoring device and method for oil-immersed transformers, comprising a transformer tank, an oil-gas separator, a chromatographic column, a gas sensor, and a data processing module, as well as a self-triggered controller. The self-triggered controller includes a main body, a ball core, a spring, and a high-temperature feedback mechanism. The high-temperature feedback mechanism detects the insulating oil temperature and controls the activation of the self-triggered controller. When the insulating oil temperature rises, the self-triggered controller introduces the insulating oil into the oil-gas separator, making it easier for dissolved gases in the insulating oil to be released, thus improving the efficiency of oil-gas separation. In this invention, the flow channel area of ​​the insulating oil decreases after passing through the self-triggered controller, resulting in an expansion effect on the insulating oil. This allows dissolved gases in the oil system to be released from the oil more quickly, making it easier to separate the insulating oil and gases in the oil-gas separator, thereby improving the efficiency of oil-gas separation.

Description

Technical Field

[0001] This invention relates to the field of power supply and distribution facilities, and in particular to an online monitoring device and method for an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers are commonly used electrical devices in power systems, providing efficient power conversion while exhibiting good insulation performance and thermal stability. As transformers age, internal faults are inevitable. Transformer insulating oil is typically composed of various hydrocarbons. When encountering faults such as discharge or overheating, the carbon-carbon and hydrocarbon bonds in these compounds break down, producing H2 and a series of low-carbon hydrocarbon gases. Besides transformer oil, the carbon-carbon, hydrocarbon, and carbon-oxygen bonds in the cellulose molecules of solid insulating materials, such as transformer insulating paper, also break down under discharge or overheating faults, forming CO, CO2, H2O, and hydrocarbon gases. Different types and degrees of faults produce different types, concentrations, and proportions of fault gases. Therefore, by detecting the types and contents of gases dissolved in the insulating oil, the insulation condition and fault type of the oil-immersed transformer can be reflected. The oil-gas separation device is an important unit in the transformer online detection system. It is responsible for separating fault gases from the transformer insulating oil. The result of oil-gas separation directly affects the concentration of the extracted fault gases, and thus affects the quantitative detection results of the extracted fault gases. Therefore, the result of oil-gas separation has a decisive impact on the reliability of the entire system.

[0003] Existing oil-gas separation methods for oil-immersed transformers mainly include vacuum degassing, headspace degassing, and membrane degassing. Among them, membrane degassing has the advantage of avoiding direct contact between oil and gas during the degassing process, thus preventing transformer oil from being contaminated by air and endangering insulation. This makes membrane degassing the most promising oil-gas separation method. However, its degassing efficiency is low and the oil-gas equilibrium time is long. Therefore, it is necessary to design an auxiliary structure for oil-gas separation to improve the efficiency of membrane degassing. Summary of the Invention

[0004] This application proposes an online monitoring device and method for oil-immersed transformers, aiming to solve the technical problems of low oil-gas separation efficiency in the online monitoring of gas in transformer oil in the prior art.

[0005] The technical solution adopted in this invention is: an online monitoring device for an oil-immersed transformer, including a transformer oil tank, an oil-gas separator, a chromatographic column, a gas sensor, and a data processing module, and further including a self-triggering controller connected between the transformer oil tank and the oil-gas separator. The self-triggering controller includes: a main body having a channel, one end of which is an inlet and the other end is an outlet, the middle of which is a pressure control section, the cross-sectional dimension of which increases from the end near the inlet to the middle; a spherical core disposed in the pressure control section, a gap between the spherical core and the periphery of the pressure control section to form a flow channel, the maximum cross-section of which is larger than the cross-section of the end of the pressure control section near the inlet, and the spherical core being movably disposed within the... The pressure control section controls the opening and closing of the pressure control section; a spring, one end of which is connected to the ball core and the other end is fixed in the channel, is used to press the ball core against the end of the pressure control section near the inlet of the channel to close the pressure control section; a high-temperature feedback mechanism is used to detect the temperature of the insulating oil in the transformer tank to control the opening of the pressure control section. When the temperature of the insulating oil in the transformer tank rises, the high-temperature feedback mechanism controls the compression spring to move the ball core away from the end of the pressure control section to open the pressure control section. The insulating oil enters the oil-gas separator to separate and collect the gas components in the insulating oil. The chromatographic column, gas sensor, and data processing module detect the gas components and analyze and process the collected results.

[0006] Furthermore, the cross-section of the pressure control section increases from both ends to the middle, the ball core is movably disposed between the two ends of the pressure control section, and the maximum cross-sectional area of ​​the flow channel is smaller than the cross-sectional area of ​​the inlet, so that the pressure of the insulating oil decreases after passing through the flow channel.

[0007] Furthermore, a push rod is provided on one side of the ball core. The push rod passes through one end of the pressure control section near the channel outlet. A spring seat is also provided on the push rod. The spring seat is located outside the pressure control section, and the spring abuts against the other side of the spring seat opposite to the ball core.

[0008] Furthermore, the high-temperature feedback mechanism includes a pressure chamber, a temperature sensing tube, and a push pin. A spring is provided on one side of the pressure chamber, and the spring is connected to one end of the push pin. The other end of the push pin is connected to the ball core. One end of the temperature sensing tube is connected to the pressure chamber, and the other end is provided with a probe for detecting the temperature of the insulating oil in the transformer tank. The temperature sensing tube and the pressure chamber are filled with a temperature-sensitive medium. When the temperature of the insulating oil rises, the temperature-sensitive medium expands in volume, the pressure chamber expands, and pushes the spring to deform. The spring, through the push pin, drives the spring seat and the ball core to squeeze towards the spring side, thereby opening the pressure control section. After the pressure of the pressure control section of the insulating oil path decreases, it enters the oil-gas separator for oil-gas separation.

[0009] Furthermore, the oil-gas separator includes a housing and a permeable diaphragm. The permeable diaphragm is disposed inside the housing to divide the housing into an oil chamber and a gas chamber. The gas chamber is located outside the oil chamber. The top of the oil chamber has an oil inlet and the bottom has an oil outlet. The gas chamber has an outlet that communicates with the chromatographic column.

[0010] Furthermore, the breathable membrane includes a support frame and a polymer membrane fixed on the support frame.

[0011] Furthermore, the support frame is provided with a first set of baffles and a second set of baffles on the inside of the oil chamber. Both the first baffles and the second baffles are inclined downward from the support frame, and the first baffles and the second baffles are staggered.

[0012] Furthermore, the gas chamber is also provided with an air inlet, which is connected to a gas sensor. The chromatographic column is connected to the gas sensor to form a gas circulation loop, and a gas pump is provided on the gas circulation loop.

[0013] A monitoring method for an online monitoring device of an oil-immersed transformer includes: when the oil temperature of the transformer rises to a preset temperature, a self-triggering controller automatically opens to inject insulating oil into the oil-gas separator. After the insulating oil flows through the self-triggering controller, the outflow area decreases and the pressure drops, causing the gas in the insulating oil to expand and be released from the insulating oil. The gas is guided to a chromatographic column in the oil-gas separator for separation of gas components. Then, the gas concentration value is converted into a voltage signal by a gas sensor. The voltage signal is transmitted to a data processing module for analysis, storage, and display. After separation in the oil-gas separator, the insulating oil flows back to the transformer oil tank.

[0014] Furthermore, the monitoring method also includes a self-trigger controller control method: In the first stage, after the self-trigger controller is automatically turned on, the flow channel area of ​​the self-trigger controller gradually increases as the transformer insulating oil temperature gradually rises within a first temperature threshold; in the second stage, as the transformer insulating oil temperature continues to rise after reaching the first temperature threshold, the flow channel area of ​​the self-trigger controller gradually decreases; in the third stage, when the transformer insulating oil temperature continues to rise to a second temperature threshold, the self-trigger controller is automatically turned off.

[0015] Compared with existing technologies, the present invention achieves the following effects: After the insulating oil passes through the self-trigger controller, the flow channel area decreases, which reduces the pressure of the insulating oil and causes it to expand. Therefore, after passing through the self-trigger controller, the insulating oil undergoes pressure reduction and expansion, allowing dissolved gases in the oil system to be released from the oil more quickly. This makes it easier to separate the insulating oil and gases in the oil-gas separator, improving the efficiency of oil-gas separation and enabling rapid separation and collection of dissolved gases in the oil under abnormal transformer temperature and pressure conditions. At the same time, the temperature of the insulating oil decreases after expansion through the self-trigger controller, and its return to the transformer oil tank can also lower the transformer oil temperature. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic block diagram of the system structure of the online monitoring device in this invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the self-trigger controller in this invention;

[0019] Figure 3 This is a simplified structural diagram of the oil-gas separator in this invention.

[0020] Figure label:

[0021] 1. Transformer oil tank; 2. Self-triggered controller; 3. Oil-gas separator; 4. Chromatographic column; 5. Gas sensor; 6. Data processing module; 21. Main body; 22. Ball core; 23. Spring; 24. Probe; 25. Channel; 26. Inlet; 27. Outlet; 28. Pressure control section; 7. Flow channel; 8. Push rod; 9. Spring seat; 241. Pressure chamber; 242. Temperature detection tube; 243. Ejector pin; 244. Spring; 31. Outer shell; 32. Breathable diaphragm; 33. Oil chamber; 34. Gas chamber; 35. Oil inlet; 36. Oil outlet; 37. Gas outlet; 38. Gas inlet; 39. First baffle; 40. Second baffle. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] This invention provides an online monitoring device for oil-immersed transformers, such as... Figure 1 As shown, the device includes a transformer oil tank 1, a self-triggered controller 2, an oil-gas separator 3, a chromatographic column 4, a gas sensor 5, and a data processing module 6. Based on the above structure, the main online monitoring method of this invention is as follows: the transformer oil tank 1 is connected to the self-triggered controller 2, and the self-triggered controller 2 is connected to the oil-gas separator 3. When the transformer is within its normal temperature and pressure range, the self-triggered controller 2 is in the off state, and the monitoring device will not perform sampling operations. Each time an abnormal increase in temperature and pressure occurs in the transformer oil tank 1, until it exceeds the set temperature value, the self-triggered controller 2 will open and divert the insulating oil in the transformer oil tank 1 to the oil-gas separator 3. The process does not require a patented oil pump; it only relies on the pressure difference between the oil-gas separator 3 and the transformer tank 1. After passing through the self-triggered controller 2, the insulating oil flows into the oil-gas separator 3 for oil-gas separation. After passing through the oil-gas separator 3, the gas separated from the insulating oil enters the chromatographic column 4 for gas component separation. Then, the gas concentration values ​​of each component are converted into voltage signals by the gas sensor 5. The gas sensor 5 is connected to the data processing module 6 to transmit the voltage signals to the data processing module 6 for analysis and storage, and then displayed on the monitor. The insulating oil after gas separation returns to the transformer tank 1 for circulation.

[0024] Among them, such as Figure 2As shown, the self-trigger controller 2 specifically includes a main body 21, a ball core 22, a spring 23, and a high-temperature feedback mechanism. The main body 21 has a channel 25 inside, with an inlet 26 and an outlet 27. The inlet 26 and outlet 27 are located at opposite ends of the channel 25. The inlet 26 is connected to the transformer oil tank 1, and the outlet 27 is connected to the oil-gas separator 3. In the middle of the channel 25 is a pressure control section 28, with one end near the inlet 26 and the other end near the outlet 27. The ball core 22 is located within the pressure control section 28, and there is a gap between the ball core 22 and the inner circumference of the pressure control section 28. A gap is formed to create a flow channel 7. The maximum cross-section of the ball core 22 is larger than the cross-section of the pressure control section 28 near the inlet 26. The ball core 22 is movably disposed within the pressure control section 28. When the ball core 22 abuts against the end of the pressure control section 28 near the inlet 26, the ball core 22 blocks the pressure control section 28, thereby causing the self-triggered controller 2 to disconnect. The ball core 22 moves away from one end of the pressure control section 28 and moves towards the middle. The cross-sectional size of the pressure control section 28 near the inlet 26 increases towards the middle, creating a gap between the ball core 22 and the middle of the pressure control section 28. This gap serves as the flow channel 7 for the insulating oil, allowing... Insulating oil can flow into the oil-gas separator 3 for oil-gas separation; a push rod 8 is provided on one side of the ball core 22, the push rod 8 passes through the end of the pressure control section 28 near the outlet 27 of the channel 25, and a spring seat 23 is also provided on the push rod 8. The spring seat 23 is located outside the pressure control section 28, and the spring 23 is sleeved on the push rod 8. One end of the spring 23 abuts against the other side of the spring seat 23 opposite to the ball core 22, and the other end of the spring 23 abuts and is fixed inside the channel 25. Under normal conditions, the ball core 22 is abutted against the end of the pressure control section 28 near the inlet 26, so that the pressure control section 28 is in a normally closed state; high temperature feedback mechanism. The pressure control section 28 is used to detect the temperature of the insulating oil in the transformer tank 1 to control the opening of the pressure control section 28. When the temperature of the insulating oil in the transformer tank 1 rises, the high-temperature feedback mechanism controls the compression spring 23 to move the ball core 22 away from the end of the pressure control section 28 to open the pressure control section 28. The insulating oil enters the oil-gas separator 3 to separate and collect the gas components in the insulating oil. The chromatographic column 4, gas sensor 5 and processing module detect the gas components and analyze and process the collected structure. At the same time, the temperature of the insulating oil after expansion after passing through the self-trigger controller 2 will decrease, and the return to the transformer tank 1 can also reduce the transformer oil temperature.

[0025] Furthermore, the high-temperature feedback mechanism includes a pressure chamber 241, a temperature sensing tube 242, and a push pin 243. A spring piece 244 is provided on one side of the pressure chamber 241, connected to one end of the push pin 243. The other end of the push pin 243 is connected to the ball core 22. One end of the temperature sensing tube 242 communicates with the pressure chamber 241, and the other end is equipped with a probe for detecting the temperature of the insulating oil in the transformer tank 1. The temperature sensing tube 242 and the pressure chamber 241 are filled with a temperature-sensitive medium. As the temperature of the insulating oil rises, the temperature-sensitive medium expands, causing the pressure chamber 241 to expand and deform the spring piece 244. The spring piece 244, through the push pin 243, drives the spring seat 23 and the ball core 22 to press towards the spring 23, thus compressing the pressure control section 2. When the pressure of the insulating oil in the pressure control section 28 of the main body 21 is reduced, it enters the oil-gas separator 3 for oil-gas separation. The temperature-sensitive medium can be an inert gas or a mixture of gases containing inert gases. The temperature-sensitive medium can have good thermal conductivity and thermal expansion coefficient, such as helium or argon. In actual use, the amount of temperature-sensitive medium in the pressure chamber 241 and the temperature detection tube 242 can be determined according to the temperature range of the transformer tank 1 during normal operation to ensure that the pressure chamber 241 will not expand under normal temperature conditions of the transformer tank 1, thus avoiding false triggering. The temperature detection tube 242 and the probe 24 are generally made of copper, which has good thermal conductivity and improves the response speed of the high-temperature feedback mechanism.

[0026] Furthermore, in this invention, the cross-section of the pressure control section 28 increases from both ends to the middle. The spherical core 22 is movably disposed between the two ends of the pressure control section 28, and the maximum cross-sectional area of ​​the flow channel 7 is smaller than the cross-sectional area of ​​the inlet 26. After the insulating oil passes through the flow channel 7, the pressure decreases, and the insulating oil expands, making it easier for the gas in the insulating oil to be released, resulting in better separation effect of the oil-gas separator 3. At the same time, this design also provides a flow control and on / off control scheme for the flow channel 7 of the pressure control section 28, which specifically includes the following control stages: In the first stage, after the self-trigger controller 2 is automatically turned on, the area of ​​the flow channel 7 of the self-trigger controller 2 gradually increases after opening as the transformer insulating oil temperature gradually rises within the first temperature threshold; In the second stage, as the transformer insulating oil temperature continues to rise after reaching the first temperature threshold, the area of ​​the flow channel 7 of the self-trigger controller 2 gradually decreases; In the third stage, when the transformer insulating oil temperature continues to rise to the second temperature threshold, the self-trigger controller 2 is automatically turned off. This achieves the following effect: When the transformer temperature begins to rise, the self-trigger controller 2 opens and gradually increases the flow rate, allowing the insulating oil to quickly enter the oil-gas separator 3 for oil-gas separation. The flow channel 7 reaches its maximum cross-section when the temperature rises to the first temperature threshold, which is a safe temperature. Once the temperature of the transformer tank 1 exceeds the first temperature threshold and continues to rise, it indicates that the temperature and pressure of the transformer tank 1 are abnormal. At this time, the pressure difference between the inlet 26 side and the outlet 27 side of the self-trigger controller 2 is too large, which can easily cause excessive load and make the self-trigger controller 2 exceed the design pressure range, resulting in damage to the components of the self-trigger controller 2 or rupture due to excessive pressure. At this time, closing the self-trigger controller 2 can reduce the pressure load, protect the integrity of the system, prevent damage or failure caused by excessive pressure, and protect the self-trigger controller 2. The transformer is protected by the transformer's own oil tank or pressure relief valve.

[0027] Furthermore, such as Figure 3 As shown, the oil-gas separator 3 includes a housing 31 and a breathable diaphragm 32. The breathable diaphragm 32 is disposed inside the housing 31 to divide the housing 31 into an oil chamber 33 and a gas chamber 34. The gas chamber 34 is disposed outside the oil chamber 33. The top of the oil chamber 33 is provided with an oil inlet 35 and the bottom is provided with an oil outlet 36. The gas chamber 34 is provided with an outlet 37 that is connected to the chromatographic column 4. The insulating oil flowing out from the self-triggered controller 2 enters the oil chamber 33, while the gas flows from the breathable diaphragm 32 into the gas chamber 34. Finally, the gas enters the chromatographic column 4 and the gas sensor 5 through the outlet 37 for detection. The gas chamber 34 is also provided with an inlet 38 that is connected to the gas sensor 5. The chromatographic column 4 and the gas sensor 5 form a gas circulation loop. An air pump is provided on the gas circulation loop, which can realize the circulation of gas and circulate the gas in the insulating oil for detection.

[0028] Furthermore, the breathable diaphragm 32 includes a support frame and a polymer membrane fixed on the support frame. The support frame is fixed inside the outer shell 31 as a skeleton, and the polymer membrane is wound and fixed on the support frame to form the breathable diaphragm 32. The support frame is provided with a first set of baffles 39 and a second set of baffles 40 on the inner side of the oil chamber 33. The first baffles 39 and the second baffles 40 are both inclined downward from the support frame, and the first baffles 39 and the second baffles 40 are staggered. The baffles can provide a turbulent effect on the insulating oil entering the oil chamber 33, increase the flow area of ​​the insulating oil in the oil chamber 33, and further improve the oil-gas separation effect.

[0029] This invention also proposes a monitoring method for an online monitoring device of an oil-immersed transformer, which includes: when the oil temperature of the transformer rises to a preset temperature, the self-triggering controller 2 automatically opens to inject insulating oil into the oil-gas separator 3. After the insulating oil flows through the self-triggering controller 2, the outflow area decreases and the pressure drops, causing the gas in the insulating oil to expand and be released from the insulating oil. The gas is guided to the chromatographic column 4 in the oil-gas separator 3 for separation of gas components. Then, the gas concentration value is converted into a voltage signal by the gas sensor 5. The voltage signal is transmitted to the processing module for analysis, storage and display. After separation in the oil-gas separator 3, the insulating oil flows back to the transformer oil tank.

[0030] The present invention achieves the following effects: After the insulating oil passes through the self-trigger controller 2, the flow channel 7 area decreases, resulting in a reduction in the pressure of the insulating oil and thus causing it to expand. Therefore, after passing through the self-trigger controller 2, the insulating oil undergoes pressure reduction and expansion, allowing dissolved gases in the oil system to be released from the oil more quickly. This makes it easier to separate the insulating oil and gases in the oil-gas separator 3, improving the efficiency of oil-gas separation and enabling rapid separation and collection of dissolved gases in the oil under abnormal transformer temperature and pressure conditions. Simultaneously, the temperature of the insulating oil decreases after expansion following the self-trigger controller 2, and its return to the transformer oil tank 1 further reduces the transformer oil temperature. Furthermore, the present invention enables on-demand detection, effectively reducing monitoring costs.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0032] 1. An online monitoring device for an oil-immersed transformer, comprising a transformer tank, an oil-gas separator, a chromatographic column, a gas sensor, and a data processing module, characterized in that it further comprises a self-triggering controller connected between the transformer tank and the oil-gas separator, the self-triggering controller comprising:

[0033] The main body has a channel, one end of which is an inlet and the other end is an outlet. The middle part of the channel is a pressure control section, and the cross-sectional dimensions of the pressure control section increase from the end near the inlet to the middle.

[0034] A ball core is disposed in the pressure control section, and there is a gap between the ball core and the periphery of the pressure control section to form a flow channel. The maximum cross-section of the ball core is larger than the cross-section of the end of the pressure control section near the inlet. The ball core is movably disposed in the pressure control section to control the on / off state of the pressure control section.

[0035] A spring, one end of which is connected to the ball core and the other end of which is fixed inside the channel, is used to press the ball core against the end of the pressure control section near the inlet of the channel to close the pressure control section;

[0036] A high-temperature feedback mechanism is used to detect the temperature of the insulating oil in the transformer tank to control the opening of the pressure control section. When the temperature of the insulating oil in the transformer tank rises, the high-temperature feedback mechanism controls the compression spring to move the ball core away from the end of the pressure control section to open the pressure control section. The insulating oil enters the oil-gas separator to separate and collect the gas components in the insulating oil. The chromatographic column, gas sensor, and data processing module detect the gas components and analyze the collected data.

[0037] 2. The online monitoring device according to claim 1, characterized in that the cross-section of the pressure control section increases from both ends to the middle, the ball core is movably disposed between the two ends of the pressure control section, and the maximum cross-sectional area of ​​the flow channel is smaller than the cross-sectional area of ​​the inlet, and the pressure of the insulating oil decreases after passing through the flow channel.

[0038] 3. The online monitoring device according to claim 2, characterized in that a push rod is provided on one side of the ball core, the push rod passes through one end of the pressure control section near the channel outlet, and a spring seat is also provided on the push rod, the spring seat is located outside the pressure control section, and the spring abuts against the other side of the spring seat relative to the ball core.

[0039] 4. The online monitoring device according to claim 3, characterized in that the high temperature feedback mechanism includes a pressure chamber, a temperature sensing tube, and a push pin. A spring is provided on one side of the pressure chamber, and the spring is connected to one end of the push pin. The other end of the push pin is connected to the ball core. One end of the temperature sensing tube is connected to the pressure chamber, and the other end is provided with a probe for detecting the temperature of the insulating oil in the transformer tank. The temperature sensing tube and the pressure chamber are filled with a temperature-sensitive medium. When the temperature of the insulating oil rises, the temperature-sensitive medium expands in volume. The pressure chamber expands and pushes the spring to deform. The spring, through the push pin, drives the spring seat and the ball core to squeeze towards the spring side, thereby opening the pressure control section. After the pressure of the pressure control section of the insulating oil path body decreases, it enters the oil-gas separator for oil-gas separation.

[0040] 5. The online monitoring device according to claim 1, wherein the oil-gas separator comprises a shell and a permeable diaphragm, the permeable diaphragm being disposed inside the shell to divide the shell into an oil chamber and a gas chamber, the gas chamber being disposed outside the oil chamber, the oil chamber having an oil inlet at the top and an oil outlet at the bottom, and the gas chamber having an outlet communicating with the chromatographic column.

[0041] 6. The online monitoring device according to claim 5, wherein the breathable membrane comprises a support frame and a polymer membrane fixed on the support frame.

[0042] 7. The online monitoring device according to claim 6, wherein the support frame is provided with a first set of baffles and a second set of baffles on the inner side of the oil chamber, the first baffles and the second baffles are both inclined downward from the support frame, and the first baffles and the second baffles are staggered.

[0043] 8. The online monitoring device according to claim 5, wherein the gas chamber is further provided with an air inlet, the air inlet is connected to a gas sensor, the chromatographic column is connected to the gas sensor to form a gas circulation loop, and a gas pump is provided on the gas circulation loop.

[0044] 9. A monitoring method for an online monitoring device of an oil-immersed transformer, characterized in that it includes: when the oil temperature of the transformer rises to a preset temperature, the self-triggering controller automatically opens to inject insulating oil into the oil-gas separator. After the insulating oil flows through the self-triggering controller, the outflow area decreases and the pressure drops, causing the gas in the insulating oil to expand and be released from the insulating oil. The gas is guided to a chromatographic column in the oil-gas separator for separation of gas components. Then, the gas concentration value is converted into a voltage signal by a gas sensor. The voltage signal is transmitted to a data processing module for analysis, storage and display. After separation in the oil-gas separator, the insulating oil flows back to the transformer oil tank.

[0045] 10. The monitoring method of the online monitoring device according to claim 9, characterized in that the monitoring method further includes a self-triggering controller control method: in the first stage, after the self-triggering controller is automatically turned on, the flow channel area of ​​the self-triggering controller gradually increases as the transformer insulating oil temperature gradually rises within a first temperature threshold; in the second stage, as the transformer insulating oil temperature continues to rise after reaching the first temperature threshold, the flow channel area of ​​the self-triggering controller gradually decreases; in the third stage, when the transformer insulating oil temperature continues to rise to a second temperature threshold, the self-triggering controller is automatically turned off.

Claims

1. An on-line monitoring device for oil-immersed transformer, comprising a transformer oil tank, an oil-gas separator, a chromatographic column, a gas sensor and a data processing module, characterized in that, It also includes a self-triggering controller connected between the transformer tank and the oil-gas separator, the self-triggering controller comprising: The main body has a channel, one end of which is an inlet and the other end is an outlet. The middle part of the channel is a pressure control section, and the cross-sectional dimensions of the pressure control section increase from the end near the inlet to the middle. A ball core is disposed in the pressure control section, and there is a gap between the ball core and the periphery of the pressure control section to form a flow channel. The maximum cross-section of the ball core is larger than the cross-section of the end of the pressure control section near the inlet. The ball core is movably disposed in the pressure control section to control the on / off state of the pressure control section. A spring, one end of which is connected to the ball core and the other end of which is fixed inside the channel, is used to press the ball core against the end of the pressure control section near the inlet of the channel to close the pressure control section; A high-temperature feedback mechanism is used to detect the temperature of the insulating oil in the transformer tank to control the opening of the pressure control section. When the temperature of the insulating oil in the transformer tank rises, the high-temperature feedback mechanism controls the compression spring to move the ball core away from the end of the pressure control section to open the pressure control section. The insulating oil enters the oil-gas separator to separate and collect the gas components in the insulating oil. The chromatographic column, gas sensor and data processing module detect the gas components and analyze the collected structure. The pressure control section increases in cross-section from both ends to the middle. The ball core is movably disposed between the two ends of the pressure control section. The maximum cross-sectional area of ​​the flow channel is smaller than the cross-sectional area of ​​the inlet. The pressure of the insulating oil decreases after passing through the flow channel. A push rod is provided on one side of the ball core. The push rod passes through one end of the pressure control section near the channel outlet. A spring seat is also provided on the push rod. The spring seat is located outside the pressure control section. The spring abuts against the other side of the spring seat opposite to the ball core. The high-temperature feedback mechanism includes a pressure chamber, a temperature sensing tube, and a push pin. A spring is provided on one side of the pressure chamber, and the spring is connected to one end of the push pin. The other end of the push pin is connected to the ball core. One end of the temperature sensing tube is connected to the pressure chamber, and the other end is provided with a probe for detecting the temperature of the insulating oil in the transformer tank. The temperature sensing tube and the pressure chamber are filled with a temperature-sensitive medium. When the temperature of the insulating oil rises, the temperature-sensitive medium expands, the pressure chamber expands, and pushes the spring to deform. The spring, through the push pin, drives the spring seat and the ball core to squeeze towards the spring side, thereby opening the pressure control section. After the pressure of the pressure control section of the insulating oil path decreases, it enters the oil-gas separator for oil-gas separation.

2. The on-line monitoring device of claim 1, wherein, The oil-gas separator includes a shell and a permeable diaphragm. The permeable diaphragm is disposed inside the shell to divide the shell into an oil chamber and a gas chamber. The gas chamber is located outside the oil chamber. The top of the oil chamber has an oil inlet and the bottom has an oil outlet. The gas chamber has an outlet that communicates with the chromatographic column.

3. An on-line monitoring device according to claim 2, characterised in that, The breathable membrane includes a support frame and a polymer membrane fixed on the support frame.

4. An on-line monitoring device according to claim 3, characterised in that, The support frame is provided with a first set of baffles and a second set of baffles on the inside of the oil chamber. Both the first baffles and the second baffles are inclined downward from the support frame and are staggered.

5. The on-line monitoring device of claim 2, wherein, The gas chamber is also provided with an air inlet, which is connected to a gas sensor. The chromatographic column is connected to the gas sensor to form a gas circulation loop, and a gas pump is provided on the gas circulation loop.

6. The monitoring method of the on-line monitoring device of the oil-immersed transformer according to claim 1, characterized in that, include: Once the transformer oil temperature reaches the preset temperature, the self-triggering controller automatically opens to inject insulating oil into the oil-gas separator. After the insulating oil flows through the self-triggering controller, the outflow area decreases and the pressure drops, causing the gas in the insulating oil to expand and be released from the insulating oil. The gas is guided to a chromatographic column in the oil-gas separator for separation of gas components. Then, the gas concentration value is converted into a voltage signal by a gas sensor. The voltage signal is transmitted to the data processing module for analysis, storage, and display. After separation in the oil-gas separator, the insulating oil flows back to the transformer oil tank.

7. The monitoring method of the online monitoring device according to claim 6, characterized in that, The monitoring method also includes a self-trigger controller control method: In the first stage, after the self-trigger controller is automatically turned on, the flow channel area of ​​the self-trigger controller gradually increases as the transformer insulating oil temperature gradually rises within a first temperature threshold; in the second stage, as the transformer insulating oil temperature continues to rise after reaching the first temperature threshold, the flow channel area of ​​the self-trigger controller gradually decreases; in the third stage, when the transformer insulating oil temperature continues to rise to a second temperature threshold, the self-trigger controller is automatically turned off.

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