Transformer insulating oil purification device using cuprous sulfide precipitation

Abstract

This application discloses a cuprous sulfide precipitation and purification device for transformer insulating oil, belonging to the field of power equipment maintenance technology. Its main purpose is to purify cuprous sulfide precipitates in transformer insulating oil. The main technical solution of this application is as follows: the cuprous sulfide precipitation and purification device for transformer insulating oil includes a filtration section, which is a concentric nested cylindrical structure composed of multiple filter cartridges. The oil inlet direction of the filtration section is axial, and the oil outlet direction is radial.

Description

Technical Field

[0001] This application belongs to the field of power equipment repair and maintenance technology, specifically relating to a copper sulfide precipitation and purification device for transformer insulating oil. Background Technology

[0002] As a core piece of equipment in the power system, the operating status of transformers directly affects the stability and reliability of the power grid.

[0003] However, during long-term operation, it was found that corrosive sulfur in transformer insulating oil readily reacts chemically with copper windings, resulting in the deposition of cuprous sulfide. Since cuprous sulfide deposits are conductive, they degrade the insulation performance of the transformer insulating oil, increasing the risk of partial discharge within the transformer. In severe cases, this can even lead to insulation breakdown, causing major power accidents and threatening the safe operation of the entire power system. Utility Model Content

[0004] In view of this, this application provides a copper sulfide precipitation purification device for transformer insulating oil, the main purpose of which is to purify the copper sulfide precipitate in transformer insulating oil.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] This application provides a copper sulfide precipitation and purification device for transformer insulating oil, including a filter section. The filter section is a concentric nested cylindrical structure composed of multiple filter cartridges. The oil inlet direction of the filter section is the axial direction of the filter section, and the oil outlet direction of the filter section is the radial direction of the filter section.

[0007] Optionally, the innermost filter element in the filtration section is connected to an oil inlet pipe, and in the radial direction of the filtration section, the filtration level of each filter element increases sequentially from the innermost filter element to the outermost filter element.

[0008] Optionally, the transformer insulating oil cuprous sulfide precipitation purification device further includes a housing and a drive unit. The filter unit is disposed inside the housing, and the drive unit is connected to the filter unit. The drive unit is used to drive the filter unit to rotate inside the housing.

[0009] Optionally, the transformer insulating oil cuprous sulfide precipitation and purification device further includes an oil storage tank, which is located on the vertical side of the outer casing and is connected to the outer casing through a communication channel.

[0010] Optionally, the oil storage tank is connected to an oil outlet pipe, and an on / off valve is provided on the oil outlet pipe to control the opening or closing of the oil outlet pipe.

[0011] Optionally, the transformer insulating oil cuprous sulfide precipitation and purification device further includes a storage tank disposed on the upper surface of the oil storage tank, and a feeding valve connected to the storage tank, the feeding valve being used to control the feeding of materials from the storage tank into the oil storage tank.

[0012] Optionally, the material is a cuprous sulfide inhibitor.

[0013] Optionally, the transformer insulating oil cuprous sulfide precipitation and purification device further includes a switching valve connected to the oil storage tank. The switching valve is used to switch between a first working position and a second working position. When the switching valve is switched to the first working position, the switching valve blocks the communication channel, and the feeding valve is closed. When the switching valve is switched to the second working position, the switching valve divides the oil storage tank into an oil storage chamber and a material storage chamber, and the feeding valve is opened.

[0014] Optionally, the transformer insulating oil cuprous sulfide precipitation and purification device further includes a liquid level sensor, which is installed in the oil storage chamber and is used to monitor the liquid level of the transformer insulating oil in the oil storage chamber in real time.

[0015] Optionally, the transformer insulating oil cuprous sulfide precipitation and purification device further includes a control unit, which is connected to the liquid level sensor, the switching valve, the feeding valve and the on / off valve respectively.

[0016] By employing the above technical solution, this application has at least the following beneficial effects:

[0017] The copper sulfide precipitation purification device for transformer insulating oil provided in the embodiments of this application, by setting the filter section as a concentric nested cylindrical structure composed of multiple filter cartridges, with the oil inlet direction being axial and the oil outlet direction being radial, can increase the contact area between the transformer insulating oil and the filter cartridges when passing through the filter section, extend the flow path of the transformer insulating oil, effectively remove precipitates (such as copper sulfide precipitates) that cause a decline in insulation performance due to oxidation of the transformer insulating oil, thereby improving the insulation performance of the transformer insulating oil, reducing the risk of partial discharge caused by a decline in insulation performance, reducing the possibility of insulation breakdown, and improving the safety and reliability of transformer operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a copper sulfide precipitation and purification device for transformer insulating oil according to an optional embodiment of this application.

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Filtration unit; 101. Filter cartridge; 2. Oil inlet pipe; 3. Outer shell; 4. Drive unit; 5. Oil storage tank; 501. Oil storage chamber; 502. Material storage chamber; 6. Connecting channel; 7. Oil outlet pipe; 8. On / off valve; 9. Material storage tank; 10. Feeding valve; 11. Switching valve; 12. Liquid level sensor; 13. Control unit. Detailed Implementation

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0025] See Figure 1 As shown in the embodiment of this application, a copper sulfide precipitation purification device for transformer insulating oil is provided, including a filter section 1. The filter section 1 is a concentric nested cylindrical structure composed of multiple filter cylinders 101. The oil inlet direction of the filter section 1 is the axial direction of the filter section 1, and the oil outlet direction of the filter section 1 is the radial direction of the filter section 1.

[0026] In this embodiment, by setting the filter section 1 as a concentric nested cylindrical structure composed of multiple filter cartridges 101, with the oil inlet direction being axial and the oil outlet direction being radial, the contact area between the transformer insulating oil and the filter cartridges 101 when passing through the filter section 1 can be increased, the flow path of the transformer insulating oil can be extended, and the precipitates (such as cuprous sulfide precipitates) that cause the insulation performance to decline due to the oxidation of the transformer insulating oil can be effectively removed. This improves the insulation performance of the transformer insulating oil, reduces the risk of partial discharge caused by the decline in insulation performance, reduces the possibility of insulation breakdown, and improves the safety and reliability of transformer operation.

[0027] The copper sulfide precipitation and purification device for transformer insulating oil provided in this application embodiment is a device for purifying transformer insulating oil. Transformer insulating oil plays an important role in transformers, including insulation, heat dissipation, and arc extinguishing. The purpose of this device is to remove impurities from transformer insulating oil caused by various factors (such as oxidation and contamination) to ensure the stability and good performance of the transformer insulating oil, thereby ensuring the normal operation of the transformer.

[0028] The filter section 1 is the core component of the aforementioned copper sulfide precipitation and purification device for transformer insulating oil. Its main function is to filter the transformer insulating oil and remove impurities such as copper sulfide precipitate. After passing through the filter section 1, the transformer insulating oil achieves a purification effect, removing substances that affect its performance.

[0029] Among them, the filter cartridge 101 is the basic unit of filtration. It can be made of materials with filtration function (such as filter paper, filter screen, etc.) and can intercept and adsorb impurity particles, insoluble colloids, and sludge deposits, such as cuprous sulfide deposits, in transformer insulating oil.

[0030] The filter section 1 is composed of multiple filter cartridges 101, which can increase the filtration area and effect, thereby effectively removing impurities from the transformer insulating oil.

[0031] In this design, multiple filter cartridges 101 are nested concentrically, meaning their central axes coincide, with one cartridge 101 nested around another, forming a structure similar to a "cylinder within a cylinder." This maximizes the filtration area within a limited space and makes the flow path of the transformer insulating oil through the filter cartridges 101 more complex and thorough, thereby improving filtration efficiency.

[0032] The multiple filter cartridges 101 are all cylindrical in shape, which is conducive to the uniform distribution of oil flow, so that the transformer insulating oil can come into relatively uniform contact with the filter cartridges 101 during the filtration process, ensuring the consistency of the filtration effect.

[0033] Specifically, in practical applications, the filter section 1 is arranged horizontally, with its axis pointing horizontally. When transformer insulating oil enters the filter section 1, it flows in from one end along the central axis, allowing the oil to enter smoothly and distribute more evenly among the filter cartridges 101. After being filtered by the filter cartridges 101, the oil flows out of the filter section 1 from the side of the filter cartridges 101 (perpendicular to the central axis) by its own weight, ensuring timely discharge of the filtered oil. Furthermore, since the oil outlet direction is perpendicular to the inlet direction, it helps to further separate impurities from the oil, improving the filtration quality. Further, when the filter section 1 is a concentric nested cylindrical structure composed of multiple filter cartridges 101, after the transformer insulating oil flows in from one axial end of the filter section 1, it flows radially from the inside out, passing through each filter cartridge 101 sequentially, and finally flows out from the outer peripheral wall of each filter cartridge 101.

[0034] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the innermost filter cartridge 101 of the filter section 1 is connected to the oil inlet pipe 2. In the radial direction of the filter section 1, the filtration level of each filter cartridge 101 increases sequentially from the innermost filter cartridge 101 to the outermost filter cartridge 101.

[0035] In this embodiment, by arranging the filter cartridges 101 radially in the filter section 1, with the filtration level of each cartridge 101 increasing sequentially from the innermost to the outermost, the transformer insulating oil can be filtered sequentially through each cartridge 101 as it flows radially from the inside out of the filter section 1. First, the innermost cartridge 101, with its relatively lower filtration level, initially filters out larger particles or more impurities. As the oil flows to the outermost cartridges 101, the cartridges 101 with higher filtration levels further filter out smaller impurity particles, insoluble colloids, sludge, and other fine impurities. This achieves the effect of gradually improving filtration accuracy, effectively removing substances that affect the performance of the transformer insulating oil, further ensuring the purification effect of the transformer insulating oil, thereby better ensuring the normal operation of the transformer and reducing the risk of partial discharge caused by a decline in insulation performance.

[0036] Among them, the innermost filter cartridge 101 in the filter section 1, which is connected to the oil inlet pipe 2, is the inlet for the transformer insulating oil to enter the filter section 1. It can guide the oil flow into the filter section 1 in an orderly manner from the innermost layer, so that the transformer insulating oil is evenly distributed between the filter cartridges 101, providing a stable oil flow input for the subsequent filtration process.

[0037] Specifically, in the filtration section 1, the filtration capacity of each filter cartridge 101 gradually increases from the innermost to the outermost cartridge, meaning the filtration level increases sequentially. This implies that the innermost filter cartridge 101 has a relatively low filtration precision, capable of initially filtering out larger impurity particles in the transformer insulating oil, such as some with larger particle sizes. As the oil flows radially from the inside to the outside, the filtration level of the filter cartridges 101 gradually increases, filtering out increasingly smaller impurities. For example, the middle filter cartridge 101 may filter out some smaller insoluble colloids, while the outermost filter cartridge 101 can intercept and adsorb finer sludge deposits and other tiny impurity particles, even ions that may affect the insulation performance of the transformer insulating oil. Through this graded filtration method, the purity of the transformer insulating oil can be gradually improved, effectively removing impurities of various particle sizes and properties, thereby better ensuring the insulation and heat dissipation performance of the transformer insulating oil and ensuring the stable operation of the transformer. In this embodiment, the filter section 1 is a concentric nested cylindrical structure composed of three filter cartridges 101. From the innermost filter cartridge 101 to the outermost filter cartridge 101, the filtration accuracy of each filter cartridge 101 is 10um, 1um, and 0.1um, respectively.

[0038] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation purification device for transformer insulating oil also includes a housing 3 and a drive unit 4. The filter unit 1 is disposed inside the housing 3, and the drive unit 4 is connected to the filter unit 1. The drive unit 4 is used to drive the filter unit 1 to rotate inside the housing 3.

[0039] In this embodiment, by setting the drive unit 4 to drive the filter unit 1 to rotate within the housing 3, the contact between the transformer insulating oil and the filter cartridge 101 can be made more thorough. On the one hand, this avoids the problem of uneven filtration caused by the oil flow rate being too fast or too slow in local areas, allowing impurities in the transformer insulating oil to be intercepted and adsorbed by the filter cartridge 101 more often. On the other hand, rotation can make the impurities on the surface of the filter cartridge 101 more evenly distributed, preventing local clogging of the filter cartridge 101, thereby improving the overall filtration effect.

[0040] Among them, the outer shell 3 is the external structure of the copper sulfide precipitation and purification device for transformer insulating oil. It is in the shape of a box and is used to protect the internal filter section 1. At the same time, it provides a closed space for the filter section 1 to prevent transformer insulating oil leakage and external impurities from entering.

[0041] The filter section 1 is provided with a drive section 4 on its axial side. The drive section 4 can be a power device such as an electric motor or a hydraulic motor. It transmits power to the filter section 1 through a transmission device (such as a gear or belt) so that the filter section 1 can rotate at a certain speed and direction.

[0042] Specifically, in this embodiment, the transmission device is a central shaft passing through the center of multiple filter cartridges 101, and the drive unit 4 is connected to the central shaft. Furthermore, to ensure the stability of rotation, the central shaft can be mounted on the housing 3 through components such as bearings. When the drive unit 4 drives the central shaft to rotate, the central shaft drives each filter cartridge 101 to rotate synchronously.

[0043] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation and purification device for transformer insulating oil also includes an oil storage tank 5, which is located on the vertical side of the outer casing 3 and is connected to the outer casing 3 through a connecting channel 6.

[0044] In this embodiment, by setting up the oil storage tank 5, the purified transformer insulating oil can be collected, providing a relatively independent and closed storage space for the purified transformer insulating oil, avoiding it from being contaminated again by external impurities, moisture, air, etc., which helps to maintain the purity and performance stability of the transformer insulating oil, and ensures that its insulation, heat dissipation and other functions are not affected.

[0045] The oil storage tank 5 is also box-shaped and is arranged on the vertical side of the outer shell 3. Utilizing the principle of gravity, the purified transformer insulating oil, after being processed by the filter section 1, can flow naturally into the oil storage tank 5 through the connecting channel 6 to complete the storage without the need for an additional power device.

[0046] The connecting channel 6 is a channel structure that connects the outer shell 3 and the oil storage tank 5. It provides a path for the transformer insulating oil, after being purified by the filter section 1, to flow from the inside of the outer shell 3 to the oil storage tank 5, so that the transformer insulating oil can flow smoothly from the filter section 1 inside the outer shell 3 to the oil storage tank 5 for storage under the action of gravity.

[0047] Specifically, the bottom of the outer casing 3 is roughly funnel-shaped, which guides the purified transformer insulating oil to converge at the lowest point, making full use of gravity to allow the transformer insulating oil to flow more smoothly into the oil storage tank 5 through the connecting channel 6. It should be noted that, compared with the conventional flat-bottom design, the funnel-shaped bottom reduces the residual transformer insulating oil in the outer casing 3 and improves the efficiency of transformer insulating oil discharge.

[0048] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the oil storage tank 5 is connected to the oil outlet pipe 7, and the oil outlet pipe 7 is equipped with an on / off valve 8, which is used to control the opening or closing of the oil outlet pipe 7.

[0049] In this embodiment, by setting the on / off valve 8, the opening or closing of the oil outlet pipe 7 can be flexibly controlled, making it convenient to output the purified transformer insulating oil from the oil storage tank 5 when needed. For example, when it is necessary to replenish the purified transformer insulating oil into the transformer, the on / off valve 8 can be opened to allow the transformer insulating oil to flow out; when it is not necessary to output oil or perform other operations, closing the on / off valve 8 can prevent the transformer insulating oil from flowing out.

[0050] Among them, the on / off valve 8 can be a solenoid valve.

[0051] The oil outlet pipe 7 is located in the lower half of the oil storage tank 5 and is close to the bottom of the oil storage tank 5.

[0052] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation and purification device for transformer insulating oil also includes a storage tank 9 disposed on the upper surface of the oil storage tank 5, and a feeding valve 10 connected to the storage tank 9. The feeding valve 10 is used to control the feeding of materials from the storage tank 9 into the oil storage tank 5.

[0053] In this embodiment, by setting up a storage tank 9 and a feeding valve 10, the required materials can be flexibly added to the oil storage tank 5 according to the actual condition of the transformer insulating oil. For example, when it is necessary to add antioxidants, rust inhibitors, and other additives to the purified transformer insulating oil to further improve its performance, the feeding valve 10 can be opened to put the corresponding materials in the storage tank 9 into the oil storage tank 5 to meet different usage requirements.

[0054] The storage bin 9 is located on the upper surface of the oil storage tank 5. It can use gravity to allow the material in the storage bin 9 to be smoothly fed into the oil storage tank 5.

[0055] The feeding valve 10 connected to the storage tank 9 can be a solenoid valve or a rotary valve plate. In practical applications, the feeding valve 10 controls the feeding of materials into the storage tank 9. When materials need to be added to the oil storage tank 5, the feeding valve 10 is opened, and the materials in the storage tank 9 fall into the oil storage tank 5 under gravity. When no materials need to be added, the feeding valve 10 is closed to prevent materials in the storage tank 9 from entering the oil storage tank 5, thus avoiding unnecessary material addition.

[0056] Specifically, in this embodiment, the material is a passivating agent, such as a cuprous sulfide inhibitor. During transformer operation, when the transformer insulating oil comes into contact with copper components, a chemical reaction may occur under certain conditions to generate cuprous sulfide. This cuprous sulfide can deposit in critical parts of the transformer, affecting its insulation performance and increasing the risk of faults such as partial discharge. By adding a passivating agent to the transformer insulating oil, it can react with substances that may participate in the formation of cuprous sulfide, altering the reaction pathway or reducing reactivity, thereby reducing the rate and amount of cuprous sulfide formation.

[0057] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation and purification device for transformer insulating oil also includes a switching valve 11 connected to the oil storage tank 5. The switching valve 11 is used to switch between a first working position and a second working position. When the switching valve 11 switches to the first working position, the switching valve 11 blocks the connecting channel 6 and the feeding valve 10 is closed. When the switching valve 11 switches to the second working position, the switching valve 11 divides the oil storage tank 5 into an oil storage chamber 501 and a material storage chamber 502, and the feeding valve 10 is opened.

[0058] In this embodiment, the material feeding process is precisely controlled by the switching valve 11, which ensures that materials such as passivating agents are added to the transformer insulating oil at the appropriate time. This helps maintain the stability of the transformer insulating oil's performance, reduces the formation of cuprous sulfide, and thus improves the insulation performance and service life of the transformer insulating oil. This ensures the safe and stable operation of power equipment such as transformers, and ultimately improves the purification effect and overall performance of the copper sulfide precipitation and purification device for transformer insulating oil.

[0059] The switching valve 11 connected to the oil reservoir 5 can be a rotary valve plate structure, and the working state can be adjusted by driving the valve plate to rotate through an electric actuator.

[0060] Specifically, when the switching valve 11 is switched to the first working position, it blocks the connecting channel 6. The connecting channel 6 is the channel connecting the outer shell 3 (the space where the filter section 1 is located) and the oil storage tank 5, allowing the transformer insulating oil purified by the filter section 1 to flow from the inside of the outer shell 3 to the oil storage tank 5. Blocking the connecting channel 6 means that the purified transformer insulating oil cannot flow from the outer shell 3 into the oil storage tank 5 at this time. At the same time, the feeding valve 10 is closed. The feeding valve 10 is the valve that controls the feeding of materials from the storage tank 9 into the oil storage tank 5. Closing the feeding valve 10 prevents materials (such as passivating agents) from entering the oil storage tank 5, avoiding accidental feeding of materials when no materials are needed. When the switching valve 11 is switched to the second working position, the switching valve 11 acts as a partition inside the oil storage tank 5, dividing the oil storage tank 5 into two parts: the oil storage chamber 501 and the material storage chamber 502. At this time, the feeding valve 10 opens, and the material in the storage tank 9 (such as cuprous sulfide inhibitor) can enter the storage chamber 502 under the action of gravity or other power through the opened feeding valve 10. It should be noted that dividing the oil storage tank 5 can, on the one hand, temporarily isolate the added material (such as passivating agent) from the transformer insulating oil in the oil storage chamber 501 in the storage chamber 502, preventing the added material (such as passivating agent) from mixing with the transformer insulating oil too early. On the other hand, it can allow the filtered transformer insulating oil to stand in the oil storage chamber 501, which helps to eliminate any air bubbles that may be present in the oil. It is understandable that if the added material (such as passivating agent) mixes with the transformer insulating oil too early, the added material (such as passivating agent) will adhere to the air bubbles in the transformer insulating oil, causing the air bubbles to be unable to break and be discharged, thereby affecting the insulation performance of the transformer insulating oil.

[0061] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation purification device for transformer insulating oil also includes a liquid level sensor 12, which is installed in the oil storage chamber 501. The liquid level sensor 12 is used to monitor the liquid level of the transformer insulating oil in the oil storage chamber 501 in real time.

[0062] In this embodiment, by monitoring the level of transformer insulating oil in the oil storage chamber 501 in real time, it can serve as a reference for controlling the opening or closing of the on / off valve 8 of the oil outlet pipe 7 and adjusting the working state of the switching valve 11, thereby improving the automation level and reliability of the device.

[0063] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the copper sulfide precipitation purification device for transformer insulating oil also includes a control unit 13, which is connected to the liquid level sensor 12, the switching valve 11, the feeding valve 10, and the on / off valve 8.

[0064] In this embodiment, by setting the control unit 13, the operation of the switching valve 11, the feeding valve 10 and the on / off valve 8 can be automatically controlled according to the liquid level height information of the transformer insulating oil in the oil storage chamber 501 monitored in real time by the liquid level sensor 12.

[0065] The control unit 13 can be an industrial computer, a PCL (programmable logic controller), or a microcontroller. In practical applications, the control unit 13 is located on the upper surface of the oil tank 5 and is electrically connected to the level sensor 12, the switching valve 11, the feeding valve 10, and the on / off valve 8.

[0066] Specifically, in this embodiment, when the transformer insulating oil level in the oil storage chamber 501 rises to a preset threshold, the level sensor 12 sends a signal to the control unit 13. Upon receiving the signal, the control unit 13 switches the switching valve 11 from the second working position to the first working position, opens the on / off valve 8 on the oil outlet pipe 7, and simultaneously closes the feeding valve 10. In this state, the transformer insulating oil in the oil storage chamber 501 begins to flow into the storage chamber 502 and mixes thoroughly with the pre-added material in the storage chamber 502. Subsequently, both flow synchronously to the oil outlet pipe 7, realizing the discharge of the transformer insulating oil. After the oil discharge process is completed, the control unit 13 resumes its function, switching the switching valve 11 from the first working position back to the second working position, restoring the oil storage function of the oil storage tank 5; simultaneously, it closes the on / off valve 8 on the oil outlet pipe 7 to prevent transformer insulating oil leakage, and reopens the feeding valve 10 to prepare for possible subsequent material addition operations, ensuring the continuous and stable operation of the copper sulfide precipitation purification device for transformer insulating oil.

[0067] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A device for precipitating and purifying cuprous sulfide in transformer insulating oil, characterized in that, It includes a filter unit (1), a housing (3), an oil storage tank (5), an oil outlet pipe (7), a material storage tank (9), a feeding valve (10), a switching valve (11), a liquid level sensor (12), and a control unit (13). The filter section (1) is disposed inside the outer shell (3). The filter section (1) is a concentric nested cylindrical structure composed of multiple filter cylinders (101). The oil inlet direction of the filter section (1) is the axial direction of the filter section (1), and the oil outlet direction of the filter section (1) is the radial direction of the filter section (1). The oil storage tank (5) is located on the vertical side of the outer shell (3), and the oil storage tank (5) is connected to the outer shell (3) through a connecting channel (6); The oil outlet pipe (7) is connected to the oil storage tank (5), and an on / off valve (8) is provided on the oil outlet pipe (7). The on / off valve (8) is used to control the oil outlet pipe (7) to open or close. The storage tank (9) is disposed on the upper surface of the oil storage tank (5); The feeding valve (10) is connected to the storage tank (9), and the feeding valve (10) is used to control the feeding of materials in the storage tank (9) into the oil storage tank (5); The material is a cuprous sulfide inhibitor; The switching valve (11) is connected to the oil storage tank (5), and the switching valve (11) is used to switch between a first working position and a second working position; when the switching valve (11) switches to the first working position, the switching valve (11) blocks the communication channel (6), and the feeding valve (10) is closed; when the switching valve (11) switches to the second working position, the switching valve (11) divides the oil storage tank (5) into an oil storage chamber (501) and a material storage chamber (502), and the feeding valve (10) is opened; The liquid level sensor (12) is installed in the oil storage chamber (501) and is used to monitor the liquid level of transformer insulating oil in the oil storage chamber (501) in real time. The control unit (13) is connected to the liquid level sensor (12), the switching valve (11), the feeding valve (10) and the on / off valve (8), respectively.

2. The copper sulfide precipitation and purification device for transformer insulating oil according to claim 1, characterized in that, The innermost filter cartridge (101) in the filter section (1) is connected to an oil inlet pipe (2). In the radial direction of the filter section (1), from the innermost filter cartridge (101) to the outermost filter cartridge (101), the filtration level of each filter cartridge (101) increases sequentially.

3. The copper sulfide precipitation and purification device for transformer insulating oil according to claim 1, characterized in that, It also includes a drive unit (4), which is connected to the filter unit (1) and is used to drive the filter unit (1) to rotate inside the housing (3).

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