An oil sludge cleaning device, oil sludge precipitation and oil sludge removal process

Abstract

The application relates to an oil sludge cleaning device which comprises a pressure cleaning device and an oil sludge collecting device. The pressure cleaning device comprises an oil chamber and a pressure supplier connected with the oil chamber. The oil chamber is filled with filter oil and inert gas, and the oil chamber is communicated with a transformer. The pressure supplier is used for providing pressure between the oil chamber and the transformer, so that the filter oil and the inert gas form an oil-gas mixture which is introduced into the transformer. The oil sludge collecting device comprises a recovery container, a pipeline assembly and an adsorption assembly. One end of the pipeline assembly is communicated with the transformer, and the other end is communicated with the recovery container. The adsorption assembly is used for sucking out the oil sludge in the transformer to the recovery container through the pipeline assembly. The oil sludge cleaning device is provided with the pressure supplier, and the oil-gas mixture is introduced into the transformer to impact the oil sludge adsorbed on the transformer, so that the oil sludge adhered to the surface of the internal components of the transformer is better discharged. The cleaned oil sludge is collected in the recovery container through the adsorption assembly, and the cleaning device can be operated in a system mode and effectively improves the cleaning effect.

Description

Technical Field

[0001] This application relates to the field of transformer cleaning technology, and in particular to an oil sludge cleaning device, an oil sludge precipitation and oil sludge removal process. Background Technology

[0002] During high-voltage power transmission, insulating oil is injected into the transformer as a cooling medium to ensure its normal operation, providing both heat dissipation and insulation. During transformer operation under high electric field strength, the insulating oil slowly decomposes and releases sludge. This sludge adheres to the surfaces of components such as the insulating windings and core clamps. Although sludge formation is a slow process, when it accumulates to a certain level or adheres to critical components like the core clamps, it can reduce the insulation of the core clamps, thus threatening the normal operation of the transformer.

[0003] To remove sludge, conventional technologies involve flushing the transformer with cleaning solvents or cleaning it in a cleaning container. However, these methods are not thorough enough, and sludge residue is easily left behind. In other words, the technologies do not offer a systematic and effective cleaning solution. Summary of the Invention

[0004] Therefore, it is necessary to provide an oil sludge cleaning device, oil sludge precipitation and oil sludge removal process to address the problem that the oil sludge accumulated on transformers over a long period of time cannot be completely removed.

[0005] An embodiment of the first aspect of this application provides an oil sludge cleaning device, the oil sludge cleaning device comprising:

[0006] A pressure cleaning device includes an oil chamber and a pressure supply unit connected to the oil chamber. The oil chamber is filled with filtered oil and inert gas, and the oil chamber is connected to a transformer. The pressure supply unit is used to provide pressure between the oil chamber and the transformer so that the filtered oil and inert gas form an oil-gas mixture and are introduced into the transformer.

[0007] An oil sludge collection device includes a recovery container, a pipeline assembly, and an adsorption assembly. One end of the pipeline assembly is connected to the bottom of the transformer, and the other end is connected to the recovery container. The adsorption assembly extracts the oil sludge inside the transformer into the recovery container through the pipeline assembly.

[0008] In one embodiment, the piping assembly includes a first piping and a second piping, one end of the first piping being connected to one side of the bottom of the transformer and the other end of the first piping being connected to the recycling container; the second piping being connected to the other side of the bottom of the transformer and the other end of the second piping being connected to the recycling container.

[0009] The adsorption assembly includes a first negative pressure adsorption pump, a first isolation valve, a second negative pressure adsorption pump, and a second isolation valve. The first negative pressure adsorption pump and the first isolation valve are disposed on the first pipeline, and the second negative pressure adsorption pump and the second isolation valve are disposed on the second pipeline.

[0010] In one embodiment, the recycling container is provided with a viewing window.

[0011] In one embodiment, the sludge cleaning equipment further includes a drying device and a third pipeline, one end of which is connected to the drying device and the other end of which is connected to the transformer; a third isolation valve is provided on the third pipeline; the drying device is configured to introduce dry compressed gas into the transformer through the third pipeline.

[0012] In one embodiment, the transformer includes a transformer body and a transformer oil conservator communicating with the transformer body, and a manhole is provided on one side of the bottom of the transformer body;

[0013] The sludge cleaning equipment also includes a fourth pipeline, one end of which is connected to the oil chamber and the other end of which is connected to the manhole; the pressure supply device is used to provide pressure to the oil-gas mixture that is introduced into the transformer body through the fourth pipeline.

[0014] In one embodiment, the sludge cleaning equipment further includes an oil filtration device connected to the oil chamber for supplying the required filtered oil to the oil chamber. The oil filtration device is equipped with a heater for adjusting the temperature of the filtered oil.

[0015] In one embodiment, the oil filtration processing device is provided with an oil-gas regulator, which adjusts the amount of filtered oil delivered by the oil filtration processing device to the oil chamber to adjust the ratio of filtered oil to inert gas output from the oil chamber to the transformer body.

[0016] The pressure supply device is a pressure regulator that can adjust the output pressure of the oil-gas mixture introduced into the transformer body.

[0017] In one embodiment, a first circulation hole is provided on the upper part of one side of the transformer body, and a second circulation hole is provided on the lower part of the other side of the transformer body. The sludge cleaning equipment also includes a circulation pipeline, which includes a first circulation pipeline and a second circulation pipeline. One end of the first circulation pipeline is connected to the first circulation hole, and the other end is connected to the oil filtration processing device. One end of the second circulation pipeline is connected to the second circulation hole, and the other end is connected to the oil filtration processing device, so that the filtered oil enters the transformer body through the first circulation hole and then flows out through the second circulation hole, forming an upward-inward and downward-outward circulation pattern.

[0018] An embodiment of the second aspect of this application provides an oil sludge precipitation process, in which oil sludge is precipitated from a transformer using the oil sludge cleaning equipment. The oil sludge precipitation process includes the following steps:

[0019] S1: Start the oil filtration device and introduce filtered oil into the transformer through the circulation pipeline to make the transformer continuously circulate and filter oil for 4 hours. After the operation is completed, stop the oil filtration device.

[0020] S2: Allow the filter oil and sludge in the transformer to stand and exchange for 2 hours to precipitate out.

[0021] S3: Start the oil filtration device and continue to feed filtered oil into the transformer so that the transformer can continuously circulate and filter oil for 3 hours. After the operation is completed, stop the oil filtration device.

[0022] S4: After allowing the filter oil and sludge in the transformer to stand and exchange for 1 hour, remove the circulation pipeline and seal the first and second circulation holes.

[0023] An embodiment of the third aspect of this application provides an oil sludge removal process, in which the oil sludge cleaning equipment is used to clean the oil sludge from a transformer. The oil sludge removal process includes the following steps:

[0024] S1: Drain all the filter oil inside the transformer and introduce dry compressed gas into the transformer;

[0025] S2: Connect the pressure cleaning device to the transformer and start the pressure cleaning device to clean the sludge inside the transformer;

[0026] S3: Activate the adsorption component to pump the sludge from the bottom of the transformer to the recovery container through the pipeline assembly;

[0027] S4: Observe the discharge of oil sludge from the transformer through the recovery container;

[0028] S5: When no obvious sludge is discharged from the pipeline assembly to the recovery container, and the extracted material from the pipeline assembly is mainly transparent filter oil, stop the pressure cleaning device and stop the introduction of dry compressed gas into the transformer.

[0029] S6: Measure the internal insulation resistance of the transformer. When the measured insulation resistance value and its average rate of change return to the normal range, the sludge removal operation is completed.

[0030] The aforementioned sludge cleaning equipment includes a pressure cleaning device and a sludge collection device. The pressure cleaning device includes an oil chamber and a pressure supply unit connected to the oil chamber. The oil chamber is filled with filtered oil and inert gas, and the oil chamber is connected to the transformer. By setting the pressure supply unit to provide pressure between the oil chamber and the transformer, the filtered oil and inert gas form an oil-gas mixture that is introduced into the transformer, impacting the sludge adsorbed on the transformer, thereby effectively removing the sludge adhering to the surfaces of components such as insulating windings and core clamps. The sludge collection device includes a recovery container, a pipeline assembly, and an adsorption assembly. By configuring the pipeline assembly with one end connected to the bottom of the transformer and the other end connected to the recovery container, the adsorption assembly, in conjunction with the pipeline assembly, extracts the sludge inside the transformer into the recovery container. Because the pipeline assembly is connected to the bottom of the transformer, it can better remove the deposited sludge. At the same time, the sludge cleaning status can be judged by observing the recovery container. This sludge cleaning equipment can be operated systematically and further improves the sludge cleaning effect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the device connection of the sludge cleaning equipment in one embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the sludge removal process in the sludge cleaning equipment of one embodiment of this application.

[0033] Reference numerals: 100, Pressure cleaning device; 110, Oil chamber; 120, Pressure feeder; 130, Fourth pipeline; 200, Sludge collection device; 210, Recovery container; 220, Piping assembly; 221, First pipeline; 222, Second pipeline; 230, Adsorption assembly; 231, First negative pressure adsorption pump; 232, First isolation valve; 233, Second negative pressure adsorption pump; 234, Second isolation valve; 300, Drying device; 310, Third pipeline; 320, Third isolation valve; 400, Transformer body; 410, Manhole; 420, First circulation hole; 430, Second circulation hole; 500, Transformer oil conservator; 600, Oil filtration device; 610, Circulation pipeline; 611, First circulation pipeline; 612, Second circulation pipeline. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] First, it's important to understand that the formation of sludge on the transformer body is a slow process. When the sludge accumulates to a certain level or adheres to critical components such as the core clamps, it can threaten the transformer's normal operation. Therefore, predictive identification before sludge accumulation has a substantial impact is crucial. Specific predictive identification mainly focuses on the impact of sludge adhesion on the insulation of the core clamps and windings. This is determined by judging the rate of change between insulation measurements and three previous values. There are two specific identification methods:

[0041] Regarding the trend detection method for iron core clamp insulation data: the existing iron core clamp insulation standard requires an insulation resistance of ≥2000MΩ to ground and between the two, which is a single judgment value; by establishing a historical trend comparison analysis method, the change rate of the measured value is compared with the previous three historical measured values ​​and the average change rate is calculated. Under the condition that the measured data is qualified, when any one of the three measured values, namely the iron core to ground insulation value, the clamp to ground insulation value, and the iron core to clamp insulation value, has an average change rate of <-50% compared with the previous three data, an early warning signal for sludge accumulation is given.

[0042] Winding insulation data trend detection method: In the existing winding insulation standard, the insulation requirement for the winding in 10 minutes is ≥500 MΩ, and when the absorption ratio ≥1.3 or the polarization index ≥1.5, it is judged as qualified, which is a single judgment value for two data; by establishing a historical trend comparison analysis method, compare the change rate of the measured value with the past three historical measured values and calculate its average change rate. When the measured data is qualified, when the average change rate value calculated by comparing any one of the three measured data of the 15-second insulation value, 60-second insulation value, and 10-minute insulation value with the previous three data < -30%, an early warning signal for the accumulated amount of sludge is given.

[0043] When it is judged through the above method that the accumulated sludge on the transformer has a potential impact, it needs to be cleaned.

[0044] Refer to Figure 1 , an embodiment of the first aspect of the present application provides a sludge cleaning device, including a pressure cleaning device 100 and a sludge collection device 200. The pressure cleaning device 100 includes an oil chamber 110 and a pressure supply device 120 connected to the oil chamber 110. The oil chamber 110 is filled with filtered oil and inert gas, and the oil chamber is connected to the transformer. The pressure supply device 120 is used to provide pressure between the oil chamber 110 and the transformer, so that the filtered oil and inert gas form an oil-gas mixture and enter the transformer; the sludge collection device 200 includes a recovery container 210, a pipeline assembly 220, and an adsorption assembly 230. One end of the pipeline assembly 220 is connected to the bottom of the transformer, and the other end is connected to the recovery container 210. The adsorption assembly 230 extracts the sludge inside the transformer into the recovery container 210 through the pipeline assembly 220.

[0045] The sludge cleaning device includes a pressure cleaning device 100 and a sludge collection device 200. The pressure cleaning device 100 includes an oil chamber 110 and a pressure supply device 120 connected to the oil chamber 110. The oil chamber 110 is filled with filtered oil and inert gas, and the oil chamber 110 is connected to the transformer. By setting the pressure supply device 120 to provide pressure between the oil chamber 110 and the transformer, the filtered oil and inert gas form an oil-gas mixture and enter the transformer interior, impacting the sludge adsorbed on the transformer, so as to better discharge the sludge adhering to the surfaces of components such as the insulating winding and the core clamping parts. The sludge collection device 200 includes a recovery container 210, a pipeline assembly 220, and an adsorption assembly 230. By configuring the pipeline assembly 220 to be connected to the bottom of the transformer at one end and to the recovery container 210 at the other end, and then through the cooperation of the adsorption assembly 230 and the pipeline assembly 220, the sludge inside the transformer is extracted into the recovery container 210. Since the pipeline assembly 220 is connected to the bottom of the transformer, it can better discharge the deposited sludge, and at the same time, the situation of sludge cleaning can be judged by observing the recovery container 210. The sludge cleaning device can operate systematically and further improve the effect of sludge cleaning.

[0046] See Figure 1 In some embodiments, the pipeline assembly 220 includes a first pipeline 221 and a second pipeline 222. One end of the first pipeline 221 is connected to one side of the bottom of the transformer, and the other end of the first pipeline 221 is connected to the recycling container 210. The second pipeline 222 is connected to the other side of the bottom of the transformer, and the other end of the second pipeline 222 is connected to the recycling container 210. The adsorption assembly 230 includes a first negative pressure adsorption pump 231, a first isolation valve 232, a second negative pressure adsorption pump 233, and a second isolation valve 234. The first negative pressure adsorption pump 231 and the first isolation valve 232 are disposed on the first pipeline 221, and the second negative pressure adsorption pump 233 and the second isolation valve 234 are disposed on the second pipeline 222.

[0047] Furthermore, oil sludge removal usually requires conventional oil filtration inside the transformer. After filtration, the oil sludge will gradually settle to the bottom of the transformer. Therefore, by setting a first pipe 221 and a second pipe 222 connected to the bottom of the transformer on both sides, and in conjunction with the adsorption component 230, the efficiency of oil sludge collection is improved.

[0048] In some embodiments, a viewing window is provided on the recycling container 210.

[0049] Furthermore, by setting a viewing window, it is possible to better observe the discharge of sludge from the recovery container 210, as well as the color and fluidity of the discharged sludge and filter oil mixture, thereby judging the sludge removal status.

[0050] See Figure 1 In some embodiments, the sludge cleaning equipment further includes a drying device 300 and a third pipeline 310, one end of which is connected to the drying device 300 and the other end of which is connected to the transformer; a third isolation valve 320 is provided on the third pipeline 310; the drying device 300 is configured to allow the introduction of dry compressed gas into the transformer through the third pipeline 310.

[0051] Furthermore, when the amount of filter oil inside the transformer is low or the filter oil is drained, dry compressed air is introduced into the transformer through the drying device 300 to prevent the internal components of the transformer from getting damp, reduce the impact of the oil sludge cleaning work on the transformer, and ensure its normal operation.

[0052] See Figure 1 In some embodiments, the transformer includes a transformer body 400 and a transformer oil conservator 500 connected to the transformer body 400. A manhole 410 is provided on one side of the bottom of the transformer body 400. The sludge cleaning device also includes a fourth pipeline 130, one end of which is connected to the oil chamber 110 and the other end of which is connected to the manhole 410. A pressure supply device 120 is used to provide pressure to the oil-gas mixture that is introduced into the transformer through the fourth pipeline 130.

[0053] Furthermore, during the sludge removal process, the oil circulation range of the transformer oil conservator 500 and its external pipelines connected to the transformer is reduced to improve the sludge removal effect. A manhole cover is installed on the manhole 410. The manhole cover is used to connect or disconnect the fourth pipeline 130 connected to the inside of the transformer, thereby cooperating with the oil chamber 110 to introduce or stop the introduction of oil-gas mixture into the transformer.

[0054] See Figure 1 In some embodiments, the sludge cleaning equipment further includes an oil filtration device 600, which is connected to the oil chamber 110 and is used to provide the required filtered oil to the oil chamber 110. The oil filtration device 600 is provided with a heater for adjusting the temperature of the filtered oil.

[0055] Furthermore, by using a heater to set the oil filtration temperature in the oil filtration processing device 600 to 65°C, the effect of oil filtration on the precipitation of sludge deposited inside the transformer is improved.

[0056] In some embodiments, the oil filtration processing device 600 is provided with an oil-gas regulator, which adjusts the amount of filtered oil delivered by the oil filtration processing device 600 to the oil chamber 110 to adjust the ratio of filtered oil and inert gas output from the oil chamber 110 to the transformer body 400; the pressure supply device 120 is a pressure regulator that can adjust the output pressure of the oil-gas mixture introduced into the transformer body 400.

[0057] Furthermore, based on the on-site needs and the actual removal of sludge, the ratio of filtered oil and inert gas input into the transformer body 400, as well as the output pressure of the oil-gas mixture introduced into the transformer body 400, can be adjusted to further improve the efficiency of sludge removal.

[0058] See Figure 2 In some embodiments, a first circulation hole 420 is provided on the upper part of one side of the transformer body 400, and a second circulation hole 430 is provided on the lower part of the other side of the transformer body 400. The sludge cleaning equipment also includes a circulation pipeline 610, which includes a first circulation pipeline 611 and a second circulation pipeline 612. One end of the first circulation pipeline 611 is connected to the first circulation hole 420, and the other end is connected to the oil filtration processing device 600. One end of the second circulation pipeline 612 is connected to the second circulation hole 430, and the other end is connected to the oil filtration processing device 600, so that the filtered oil enters the transformer body 400 through the first circulation hole 420 and then flows out through the second circulation hole 430, forming an upward-inward and downward-outward circulation pattern.

[0059] Furthermore, since the insulating oil operates in a bottom-in, top-out manner during normal operation of the transformer, the first circulation hole 420 and the second circulation hole 430 are set to a top-in, bottom-out manner during oil filtration circulation, forming a circulation method that is the opposite of the conventional operation method. This improves the precipitation effect of oil sludge and thus enhances the removal effect of oil sludge.

[0060] See Figure 1 and Figure 2 The second aspect of this application provides an oil sludge precipitation process, specifically using oil sludge cleaning equipment to precipitate oil sludge from a transformer. The oil sludge precipitation process includes the following steps:

[0061] S1: Start the oil filtration device 600 and introduce filtered oil into the transformer through the circulation pipeline 610 to make the transformer continuously circulate and filter oil for 4 hours. After the operation is completed, stop the oil filtration device 600.

[0062] S2: Allow the filter oil and sludge in the transformer to stand and exchange for 2 hours to precipitate out.

[0063] S3: Start the oil filtration device 600 and continue to feed the filtered oil into the transformer to keep the transformer circulating and filtering the oil for 3 hours. After the operation is completed, stop the oil filtration device 600.

[0064] S4: After allowing the filter oil and sludge in the transformer to stand and exchange for 1 hour, remove the circulation pipe 610 and seal the first circulation hole 420 and the second circulation hole 430.

[0065] Furthermore, the oil filtration processing device 600 is configured as a vacuum oil filter. By filtering the insulating oil in the transformer and purifying it through multiple cycles, it can remove impurities from the slightly deteriorated transformer oil. At the same time, it can separate oil and gas, and perform preliminary treatment on the insulating oil in the transformer to bring it close to the qualified oil standard.

[0066] See Figure 1 The third aspect of this application provides an oil sludge removal process, specifically using the aforementioned oil sludge cleaning equipment to clean the oil sludge from the transformer. The oil sludge removal process includes the following steps:

[0067] S1: Drain all the filter oil inside the transformer and introduce dry compressed gas into the transformer;

[0068] S2: Connect the pressure cleaning device 100 to the transformer and start the pressure cleaning device 100 to clean the oil sludge inside the transformer.

[0069] S3: Start the adsorption component 230 so that it can pump the oil sludge at the bottom of the transformer to the recovery container 210 through the pipeline component 220;

[0070] S4: Observe the discharge of oil sludge from the transformer through the recycling container 210;

[0071] S5: When no obvious sludge is discharged from the pipeline assembly 220 to the recovery container 210, and the extracted material from the pipeline assembly 220 is mainly transparent filter oil, stop the pressure cleaning device 100 and stop the introduction of dry compressed gas into the transformer.

[0072] S6: Measure the internal insulation resistance of the transformer. When the measured insulation resistance value and its average rate of change return to the normal range, the sludge removal operation is completed.

[0073] Furthermore, in one embodiment, step S1 includes: purging all the filter oil inside the transformer, opening the third isolation valve 320, and allowing the drying device 300 to introduce dry compressed gas into the transformer through the third pipeline 310.

[0074] In one embodiment, step S2 includes: connecting the high-voltage cleaning device to the manhole 410 and starting the high-voltage cleaning device to clean the sludge inside the transformer.

[0075] In one embodiment, step S3 includes: opening the first isolation valve 232 and starting the first negative pressure adsorption pump 231 to pump the sludge on the bottom left side of the transformer to the recovery container 210 through the first pipeline 221; and opening the second isolation valve 234 and starting the second negative pressure adsorption pump 233 to pump the sludge on the bottom right side of the transformer to the recovery container 210 through the second pipeline 222.

[0076] In one embodiment, step S4 includes: observing the discharge of sludge from the transformer through a viewing window of the recovery container 210.

[0077] In one embodiment, step S5 includes: when no obvious sludge is discharged from the first pipeline 221 and the second pipeline 222, and the extracted material is observed to be mainly transparent filtered oil, the high-pressure cleaning device and the drying device 300 are shut down.

[0078] In one embodiment, step S6 includes: measuring the internal insulation resistance value of the transformer; when the measured insulation resistance value and its average rate of change return to the normal range, the sludge removal operation ends.

[0079] In one embodiment, step S1 includes: draining all the filter oil inside the transformer; and opening the third isolation valve 320 to prevent the internal components of the transformer from directly contacting the humid air, so that the drying device 300 can introduce dry compressed gas into the transformer through the third pipeline 310.

[0080] In one embodiment, step S2 includes: after opening the manhole cover of the manhole 410, connecting the high-pressure cleaning device to the manhole 410, and cooperating with the oil chamber 110 to introduce a high-pressure oil-gas mixture into the transformer, so that the transformer interior is subjected to impact cleaning.

[0081] In one embodiment, step S3 includes: opening the first isolation valve 232 and starting the first negative pressure adsorption pump 231 to pump the sludge on the bottom left side of the transformer to the recovery container 210 through the first pipeline 221; and opening the second isolation valve 234 and starting the second negative pressure adsorption pump 233 to pump the sludge on the bottom right side of the transformer to the recovery container 210 through the second pipeline 222.

[0082] In one embodiment, step S4 includes: after the sludge is extracted, observing the discharge of the sludge from the recovery container 210 through the viewing window of the recovery container 210.

[0083] In one embodiment, step S5 includes: when it is observed that no obvious sludge is discharged from the first pipeline 221 and the second pipeline 222, and the extracted material is mainly transparent filtered oil, the pressure cleaning device 100 and the drying device 300 are stopped.

[0084] In one embodiment, step S6 includes: measuring the insulation data trend detection method for the core clamp and winding as described above, and when the measured insulation resistance value and its average rate of change return to the normal range, the sludge removal operation ends.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil sludge cleaning device, characterized in that, include: A pressure cleaning device (100) includes an oil chamber (110) and a pressure supply device (120) connected to the oil chamber (110). The oil chamber (110) is filled with filter oil and inert gas, and the oil chamber (110) is connected to a transformer. The pressure supply device (120) is used to provide pressure between the oil chamber (110) and the transformer so that the filter oil and inert gas form an oil-gas mixture and are introduced into the transformer. Oil sludge collection device (200), the oil sludge collection device (200) includes a recovery container (210), a pipeline assembly (220) and an adsorption assembly (230), one end of the pipeline assembly (220) is connected to the bottom of the transformer and the other end is connected to the recovery container (210), the adsorption assembly (230) extracts the oil sludge inside the transformer into the recovery container (210) through the pipeline assembly (220); The transformer includes a transformer body (400) and a transformer oil conservator (500) connected to the transformer body (400). A manhole (410) is provided on one side of the bottom of the transformer body (400). One end of the fourth pipeline (130) is connected to the oil chamber (110), and the other end is connected to the manhole (410). The pressure supply device (120) is used to provide pressure to the oil-gas mixture that is introduced into the transformer body (400) through the fourth pipeline (130). A manhole cover is provided on the manhole (410), which is used to connect or disconnect the fourth pipeline (130) connected to the inside of the transformer. An oil filtration processing device (600) is provided with an oil-gas regulator. The oil filtration processing device (600) is connected to the oil chamber (110) and is used to provide the required filtered oil to the oil chamber (110). The oil filtration processing device (600) is provided with a heater for adjusting the filtered oil temperature to set the filtered oil temperature in the oil filtration processing device (600) at 65°C. The oil-gas regulator adjusts the amount of filtered oil delivered by the oil filtration processing device (600) to the oil chamber (110) to adjust the ratio of filtered oil and inert gas output from the oil chamber (110) to the transformer body (400). The pressure supply device (120) is a pressure regulator that can adjust the output pressure of the oil-gas mixture entering the transformer body (400).

2. The sludge cleaning equipment according to claim 1, characterized in that, The pipeline assembly (220) includes a first pipeline (221) and a second pipeline (222). One end of the first pipeline (221) is connected to one side of the bottom of the transformer, and the other end of the first pipeline (221) is connected to the recycling container (210). The second pipeline (222) is connected to the other side of the bottom of the transformer, and the other end of the second pipeline (222) is connected to the recycling container (210). The adsorption assembly (230) includes a first negative pressure adsorption pump (231), a first isolation valve (232), a second negative pressure adsorption pump (233), and a second isolation valve (234). The first negative pressure adsorption pump (231) and the first isolation valve (232) are disposed on the first pipeline (221), and the second negative pressure adsorption pump (233) and the second isolation valve (234) are disposed on the second pipeline (222).

3. The sludge cleaning equipment according to claim 1, characterized in that, The recycling container (210) is provided with a viewing window.

4. The sludge cleaning equipment according to claim 1, characterized in that, The sludge cleaning equipment also includes a drying device (300) and a third pipeline (310), one end of which is connected to the drying device (300) and the other end is connected to the transformer; a third isolation valve (320) is provided on the third pipeline (310); the drying device (300) is configured to allow the introduction of dry compressed gas into the transformer through the third pipeline (310).

5. The sludge cleaning equipment according to claim 1, characterized in that, A first circulation hole (420) is provided on the upper part of one side of the transformer body (400), and a second circulation hole (430) is provided on the lower part of the other side of the transformer body (400). The sludge cleaning equipment also includes a circulation pipeline (610), which includes a first circulation pipeline (611) and a second circulation pipeline (612). One end of the first circulation pipeline (611) is connected to the first circulation hole (420), and the other end is connected to the oil filtration processing device (600). One end of the second circulation pipeline (612) is connected to the second circulation hole (430), and the other end is connected to the oil filtration processing device (600), so that the filtered oil enters the transformer body (400) through the first circulation hole (420) and then flows out through the second circulation hole (430), forming an upward-inward and downward-outward circulation pattern.

6. A process for removing oil sludge, characterized in that, The transformer is subjected to sludge removal using the sludge cleaning equipment as described in claim 5, wherein the sludge removal process includes the following steps: S1: Start the oil filtration processing device (600) and introduce filtered oil into the transformer through the circulation pipeline (610) so that the transformer can continuously circulate and filter oil for 4 hours. After the operation is completed, stop the oil filtration processing device (600). S2: Allow the filter oil and sludge in the transformer to stand and exchange for 2 hours to precipitate out. S3: Start the oil filtration device (600) and continue to feed filtered oil into the transformer so that the transformer can continuously circulate and filter oil for 3 hours. After the operation is completed, stop the oil filtration device (600). S4: After allowing the filter oil and sludge in the transformer to stand and exchange for 1 hour, remove the circulation pipeline (610) and seal the first circulation hole (420) and the second circulation hole (430).

7. A process for removing sludge, characterized in that, The transformer is cleaned of oil sludge using the oil sludge cleaning equipment as described in any one of claims 1-5, wherein the oil sludge removal process includes the following steps: S1: Drain all the filter oil inside the transformer and introduce dry compressed gas into the transformer; S2: Connect the pressure cleaning device (100) to the transformer and start the pressure cleaning device (100) to clean the sludge inside the transformer; S3: Activate the adsorption component (230) to pump the sludge at the bottom of the transformer to the recovery container (210) through the pipeline component (220). S4: Observe the discharge of oil sludge from the transformer through the recovery container (210); S5: When no obvious sludge is discharged from the pipeline assembly (220) to the recovery container (210), and the substance extracted from the pipeline assembly (220) is mainly transparent filter oil, the pressure cleaning device (100) is shut down and the dry compressed gas is stopped from being introduced into the transformer. S6: Measure the internal insulation resistance of the transformer. When the measured insulation resistance value and its average rate of change return to the normal range, the sludge removal operation is completed.

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