Drainage and leakage stoppage method for small copper pipe of cooling fin of oil-immersed transformer

Abstract

The invention relates to the technical field of power equipment maintenance, and particularly discloses an oil-immersed transformer cooling fin small copper pipe drainage plugging method, which comprises the following steps: searching cracking oil leakage and conventional plugging treatment positions, and marking the positions as plugging areas; the leaking stoppage area is cleaned; manufacturing a bent copper flow guide pipe, selecting one end of the flow guide pipe as an oil discharge port, and selecting the other end as a root part; a ball valve is installed at an oil discharge outlet of the flow guide pipe; the root of the flow guide pipe is split and tightly attached to the oil seepage face; the root of the flow guide pipe is filled with a rapidly-solidified oil-resistant metal plugging agent, so that leaked oil is drained to the oil discharge outlet through the flow guide pipe, and the plugging area is kept in a pressure relief state; the root of the flow guide pipe is coated with oil-resistant metal leaking stoppage glue; after 7 days, closing the ball valve if the leaking stoppage part is solidified and is well sealed; if the leaking stoppage part runs for 15 days and no oil leakage phenomenon exists, it is determined that leaking stoppage succeeds. According to the invention, the flow guide pipe is used for guiding and discharging insulating oil leaked from small cracks to drain oil pressure of a leaking stoppage surface, so that the problem of leaking stoppage of irregular corners of the cooling fin of the 500kV transformer is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment maintenance, and in particular to a method for draining and plugging leakage of a small copper tube of an oil-immersed transformer heat sink. Background Art

[0002] As a key equipment, the stable operation of 500kV oil-immersed transformers is crucial to the safety and reliability of the power system. However, during operation, the transformer heat sink may have oil leakage problems, which will not only affect the heat dissipation performance of the transformer, but also pose a threat to the safe operation of the equipment. Specifically, the oil leakage problem usually occurs on the outer shell of the heat sink, especially those areas with small cracks or compression seams. These cracks or gaps may gradually intensify and cause increased oil leakage due to electrical and mechanical stress during the operation of the transformer. The leaking insulating oil will not only cause equipment pollution and environmental pollution, but may also cause the insulating oil inside the oil tank to be damp and discharge and oil spray accidents, which seriously threaten the safe and stable operation of the oil-immersed transformer.

[0003] In the prior art, some plugging methods have been adopted, such as using oil-resistant sealants, high-strength glue and other materials to seal the cracks. However, these traditional methods have some obvious disadvantages in practical applications: 1. Since the basic filling of the plugging surface is not solid, small cracks are prone to oil leakage, resulting in poor sealing effect; 2. The plugging glue is easily affected by "oil blowing bubbles" before hardening, causing damage to the plugging surface and resulting in incomplete sealing; 3. Traditional methods also have problems such as irregular appearance structure of the plugging surface and poor sealing effect. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention proposes a small copper tube drainage plugging method for oil-immersed transformer heat sinks, which cleverly uses the guide tube to drain the insulating oil leaking from small cracks to release the oil pressure on the plugging surface, eliminates the damage to the plugging surface caused by "oil blowing bubbles" before the plugging glue on the plugging surface hardens, and overcomes the problem of plugging irregular corners of the 500kV transformer heat sink.

[0005] The method for draining and plugging leakage of a small copper tube of an oil-immersed transformer heat sink according to an embodiment of the present invention comprises:

[0006] Check the heat sink to find out where cracks and oil leaks are present and where conventional plugging has been performed, and mark them as plugging areas.

[0007] The plugging area is cleaned to ensure that there are no impurities and oil accumulation in the plugging area.

[0008] A copper guide tube with an angle adapted to the plugging area is manufactured, one end of the guide tube is selected as the oil discharge port, and the other end of the guide tube is selected as the root.

[0009] A stainless steel ball valve is selected for the guide pipe, and the ball valve is installed at the oil discharge port of the guide pipe, and it is ensured that the seal between the ball valve and the guide pipe is intact.

[0010] The root of the guide pipe is cut open to a certain length and closely fit with the oil seepage surface of the plugging area, and then the guide pipe is fixed on the heat sink.

[0011] A fast-solidifying oil-resistant metal plugging agent is used to fill the root of the guide pipe, so that the leaked oil is drained to the oil discharge port through the guide pipe, and the plugging area is kept in a pressure relief state.

[0012] Use oil-resistant metal plugging glue to brush the root of the guide pipe, and apply the next layer of oil-resistant metal plugging glue after the previous layer solidifies, and use the n+1 layer-by-layer brushing method to treat the oil seepage surface.

[0013] Continue for at least 7 days, observe the plugging part formed by the oil-resistant metal plugging glue, and close the stainless steel ball valve when the plugging part solidifies and the seal is intact.

[0014] Continue to observe the operation of the plugging part for at least 15 days. If there is no oil leakage, it can be considered a successful plugging.

[0015] The small copper tube drainage and plugging method for the oil-immersed transformer heat sink of the embodiment of the present invention cleverly uses the guide tube to drain the insulating oil leaking from the small cracks to release the oil pressure on the plugging surface, thereby eliminating the damage to the plugging surface caused by "oil blowing bubbles" before the plugging glue on the plugging surface hardens, thereby overcoming the problem of plugging irregular corners of the 500kV transformer heat sink.

[0016] In some embodiments, for a location that has undergone conventional plugging treatment, the step of cleaning the plugging area includes:

[0017] Grind off all the original plugging materials and ensure that the heat sink body is not damaged during the operation to prevent unnecessary expansion of the cracks;

[0018] After lightly grinding the paint layer around the crack, use a cleaning agent to clean the plugging area to remove impurities, oil stains and accumulated oil, so as to confirm the oil leakage location;

[0019] Use dry air to blow dry the plugged area to ensure that its surface is dry and free of moisture.

[0020] In some embodiments, the guide tube is designed to be L-shaped, and the step of fixing the guide tube on the heat sink includes:

[0021] Along the extension direction of the crack, apply the oil surface repair agent on the edges of both sides of the crack from top to bottom and from far away from the crack to gradually approach the crack to form a groove flow channel;

[0022] After the oil surface repair agent to be applied is completely solidified, the guide pipe is arranged along the flow channel direction;

[0023] An oil surface emergency repair agent is pre-buried between the guide pipe and the heat sink in a small amount and multiple times to strengthen the connection between the guide pipe and the heat sink and ensure that the leaking oil is drained into the guide pipe.

[0024] In some embodiments, after determining that the plugging is successful, the ball valve is used to drain the oil regularly. After confirming that the oil sealing effect is stable and the oil leakage problem is effectively controlled, a plug is installed at the oil discharge port of the guide tube to seal the guide tube.

[0025] In some embodiments, before cleaning the plugging area, stop the radiator and ensure that the oil pressure inside the heat sink has dropped to a safe range to avoid oil bubbles caused by excessive oil pressure during the plugging process, thereby further improving the plugging effect and the strength of the sealing surface.

[0026] In some embodiments, when the root of the guide tube is filled with the fast-solidifying oil-resistant metal plugging agent, the fast-solidifying oil-resistant metal plugging agent should be filled evenly and fully to ensure that there is no gap between the root of the guide tube and the oil seepage surface of the heat sink.

[0027] In some embodiments, before using the fast-setting oil-resistant metal plugging agent to fill the root of the guide pipe, the root of the guide pipe is pre-treated by grinding, rust removal, etc. to improve the adhesion and bonding of the plugging agent, thereby ensuring that the plugging effect is more durable and reliable.

[0028] In some embodiments, the coating thickness of the first n layers of oil-resistant metal plugging glue is 0.1 mm, and the coating thickness of the last layer of oil-resistant metal plugging glue is greater than 0.1 mm.

[0029] In some embodiments, the oil-resistant metal leak-proof adhesive should be applied evenly and continuously, and there should be an appropriate curing time between each layer.

[0030] In some embodiments, after the plugging is determined to be successful, the plugging area is regularly inspected and maintained to ensure that there is no oil leakage for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a method for draining and plugging leakage of a small copper tube of an oil-immersed transformer heat sink according to an embodiment of the present invention.

[0032] Figure 2The present invention is a flowchart of a method for draining and plugging leakage of a small copper tube of an oil-immersed transformer heat sink according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Heat sink 1, leak plugging area 2, flow guide pipe 3, ball valve 4. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] The following is combined with Figure 1 and 2 The invention describes a method for draining and plugging leakage of a small copper tube of an oil-immersed transformer heat sink 1 according to an embodiment of the present invention.

[0037] S1. Check the heat sink 1 to find the locations where cracks and oil leakage exist and the locations where conventional plugging treatment has been performed, and mark them as plugging areas 2.

[0038] A comprehensive and detailed inspection is performed on the heat sink 1 of the oil-immersed transformer. The purpose of this step is to find out all the locations on the heat sink 1 where cracks and oil leakage exist, as well as those locations that have been routinely sealed but may still have oil leakage problems, and to mark these locations as plugging areas 2 with obvious markings to facilitate subsequent operations.

[0039] S2. Clean the plugging area 2 to ensure that there are no impurities and oil accumulation in the plugging area 2.

[0040] Clean the marked plugging area 2, including removing any impurities and accumulated oil that may affect the plugging effect, to ensure that the surface of the plugging area 2 is clean and flat, so that the subsequent plugging materials can fit tightly to form an effective seal.

[0041] S3, make an angled copper guide tube 3 suitable for the plugging area 2, select one end of the guide tube 3 (such as Figure 1 The left end shown in the figure) is the oil outlet, and the other end of the guide tube 3 (as shown in the figure) is selected as the oil outlet. Figure 1 The right end shown) is the root.

[0042] According to the specific shape and size of the plugging area 2, an adaptive angled copper guide tube 3 is made. The design of this guide tube 3 should ensure that the leaked oil can be smoothly drained to a centralized oil drain port. One end of the guide tube 3 is selected as the oil drain port, and the other end is used as the root to fit closely with the plugging area 2.

[0043] S4. Select a stainless steel ball valve 4 to be installed on the flow guide pipe 3, install the ball valve 4 on the oil discharge port of the flow guide pipe 3, and ensure that the seal between the ball valve 4 and the flow guide pipe 3 is intact.

[0044] At the oil discharge port of the guide pipe 3, select a suitable stainless steel ball valve 4 for installation. The function of the ball valve 4 is to control the opening and closing of the oil discharge port so that the leaked oil can be easily discharged when needed, playing a role in drainage and pressure relief. After the plugging surface is sealed and hardened, close the ball valve to cut off the oil flow. When installing the ball valve 4, it is necessary to ensure that the seal between it and the guide pipe 3 is intact to prevent oil leakage from seeping out of the gap between the ball valve 4 and the guide pipe 3.

[0045] S5, cutting the root of the guide pipe 3 to a certain length and fitting it tightly to the oil seepage surface of the plugging area 2, and then fixing the guide pipe 3 on the heat sink 1.

[0046] The root of the guide pipe 3 is cut open to a certain length and made to fit tightly on the oil seepage surface of the plugging area 2 so that the insulating oil leaking from the oil seepage surface can enter the guide pipe 3. After the guide pipe 3 is placed at the set position, the guide pipe 3 is temporarily or permanently fixed on the heat sink 1 by an appropriate fixing method (for example, by tying it with wire or by pre-burying the guide pipe 3 on the heat sink 1 with a repair agent).

[0047] S6. Use a fast-solidifying oil-resistant metal plugging agent to fill the root of the guide pipe 3, so that the leaked oil is drained to the oil discharge port through the guide pipe 3, and the plugging area 2 is kept in a pressure relief state.

[0048] Use fast-solidifying oil-resistant metal plugging agent to fill the root of the guide pipe 3. On the one hand, it can further fix the guide pipe 3, and on the other hand, it can further ensure that the leaked oil can be smoothly drained to the oil drain port and keep the plugging area 2 in a pressure relief state, thereby eliminating the damage to the plugging surface caused by "oil blowing bubbles" before the plugging glue on the plugging surface hardens.

[0049] S7. Use oil-resistant metal plugging glue to brush the root of the guide pipe 3. Apply the next layer of oil-resistant metal plugging glue after the previous layer solidifies. Use the n+1 layer-by-layer brushing method to treat the oil leakage surface.

[0050] After the root of the guide pipe 3 is treated, start to apply the oil-resistant metal plugging glue, and use the n+1 layer-by-layer application method to treat the oil seepage surface, that is, the first n layers are applied with the same thickness, and a layer of plugging glue is applied first, and then the next layer of oil-resistant metal plugging glue is applied after it solidifies, until the n-th layer of oil-resistant metal plugging glue is applied, and after the n-th layer of oil-resistant metal plugging glue solidifies, apply the last layer of oil-resistant metal plugging glue, and the thickness of the last layer of oil-resistant metal plugging glue is greater than that of the first n layers of oil-resistant metal plugging glue, where n≥2; in this way, a multi-layer dense plugging layer can be formed, which ensures that the plugging surface is firm and better sealed while making the plugging surface beautiful in appearance.

[0051] S8. Continue for at least 7 days and observe the plugging part formed by the oil-resistant metal plugging glue. When the plugging part solidifies and the seal is intact, close the stainless steel ball valve 4.

[0052] Continue to observe for at least 7 days to check whether the plugging part formed by the oil-resistant metal plugging glue is solidified and the seal is intact. If everything is normal, it means that the sealing effect of the plugging part is intact, the stainless steel ball valve 4 can be closed, and the heat sink 1 can be put into use.

[0053] S9. Continue to observe the operation of the plugging unit for at least 15 days. If there is no oil leakage, the plugging is deemed successful.

[0054] The heat sink 1 is put into use for at least 15 days, and the plugging part is continuously observed. If there is no oil leakage, it means that the plugging part can maintain a good sealing effect under the working environment of the heat sink 1, and the plugging is deemed to be successful.

[0055] The small copper tube drainage and plugging method for the oil-immersed transformer heat sink 1 of the embodiment of the present invention cleverly uses the guide tube 3 to drain the insulating oil leaking from the small cracks to release the oil pressure on the plugging surface, thereby eliminating the damage to the plugging surface caused by "oil blowing bubbles" before the plugging glue on the plugging surface hardens, thereby overcoming the problem of plugging irregular corners of the 500kV transformer heat sink 1.

[0056] In some embodiments, for a location that has been subjected to conventional plugging treatment, the step of cleaning the plugging area 2 includes:

[0057] Grind off all the original plugging materials and ensure that the operation process does not damage the heat sink 1 body to prevent unnecessary expansion of the cracks. For locations that have been subjected to conventional plugging treatment but may still be leaking oil, first grind off all the original plugging materials and remove the old plugging materials so that the plugging treatment can be performed again. During the grinding process, special attention should be paid to not damage the main structure of the heat sink 1 to prevent unnecessary expansion of the cracks.

[0058] After lightly grinding the paint layer around the crack, use a cleaning agent to clean the plugging area 2, and clean up impurities, oil stains, and oil accumulation, so as to confirm the oil leakage location. After removing the original plugging material, it is necessary to lightly grind the paint layer around the crack to remove the aging and peeling parts of the paint layer surface, so as to facilitate the search for possible tiny cracks. At the same time, light grinding can also improve the bonding force between the plugging material and the surface of the heat sink 1, thereby improving the plugging effect; after grinding, use a cleaning agent to clean the plugging area 2, and clean up impurities, oil stains, and oil accumulation, on the one hand to avoid the influence of impurities, oil stains, and oil accumulation on the search for the oil leakage location and possible tiny cracks, and on the other hand to facilitate the subsequent application and curing of the plugging material.

[0059] Use dry air to blow dry the plugging area 2 to ensure that its surface is dry and free of moisture. On the one hand, this will eliminate the influence of water on finding the oil leakage location, and on the other hand, it will facilitate the subsequent application and curing of the plugging material.

[0060] Therefore, the method for plugging leakage by draining a small copper tube of an oil-immersed transformer heat sink 1 according to the embodiment of the present invention cleans the plugging area 2, which, on the one hand, avoids the influence of impurities, oil stains and accumulated oil on finding the oil seepage position and possible micro cracks, and on the other hand, facilitates the subsequent application and curing of the plugging material.

[0061] In some embodiments, the guide tube 3 is designed to be L-shaped. This design can ensure that the guide tube 3 can fit the crack tightly and effectively drain the seepage oil to the designated oil drain port. One end of the L-shaped guide tube 3 serves as the oil drain port, and the other end is arranged along the extension direction of the crack to better capture and drain the seepage oil. The steps of fixing the guide tube 3 on the heat sink 1 include:

[0062] Along the extension direction of the crack, the oil surface repair agent is applied from top to bottom and from far away from the crack to the crack edge on both sides to form a groove flow channel. Before fixing the guide tube 3, the oil surface repair agent needs to be applied to the crack edges on both sides of the heat sink 1. The application should be carried out from top to bottom and from far away from the crack to the crack edge to form a groove flow channel. The function of this groove flow channel is to guide the seepage oil to flow to the guide tube 3 and ensure that the seepage oil can be smoothly drained. When applying the oil surface repair agent, attention should be paid to controlling the thickness and uniformity of the application to ensure that the formed groove flow channel has sufficient depth and width.

[0063] After the applied oil surface repair agent is completely solidified, the guide tube 3 is arranged along the flow channel direction to ensure that the leaked insulating oil smoothly enters the guide tube 3. During the solidification process, care should be taken to avoid any form of touching or disturbing the applied area to avoid affecting the solidification effect of the oil surface repair agent.

[0064] An emergency oil surface repair agent is pre-buried between the guide tube 3 and the heat sink 1 in small amounts and multiple times to strengthen the connection between the guide tube 3 and the heat sink 1, ensure that the guide tube 3 will not loosen or fall off during long-term use, and ensure that the leaked oil is drained into the guide tube 3.

[0065] Therefore, the small copper tube drainage and plugging method for the oil-immersed transformer heat sink 1 of the embodiment of the present invention processes the cracks to form a groove flow channel, and makes the guide tube 3 and the groove flow channel cooperate with each other, which not only ensures the close fit and effective drainage of the guide tube 3 and the heat sink 1, but also further strengthens the fixing effect of the guide tube 3 by pre-embedded oil surface emergency repair agent.

[0066] In some embodiments, after determining that the plugging is successful, the ball valve 4 is used to drain the oil regularly. After confirming that the sealing effect is stable and the oil leakage problem is effectively controlled, a plug is installed at the oil discharge port of the guide tube 3 to seal the guide tube 3.

[0067] It should be noted that in order to ensure the stability and durability of the oil sealing effect, it is necessary to continue to use the stainless steel ball valve 4 to perform regular oil drainage operations to verify whether the plugging material has been completely solidified and formed an effective seal; after confirming that the oil sealing effect is stable and the oil leakage problem is effectively controlled, a plug can be installed at the oil discharge port of the guide pipe 3 for permanent sealing to reduce the risk of leakage at the guide pipe 3.

[0068] In some embodiments, before cleaning the plugging area 2, the operation of the radiator is stopped by controlling a switch or circuit breaker, and the oil pressure inside the heat sink 1 is gradually reduced to a safe range through the transformer oil pressure control system, and then the oil pressure reduction is stopped, and the oil pressure changes are continuously monitored to ensure that the oil pressure remains within a safe range to avoid oil blowing bubbles caused by excessive oil pressure during the plugging process, thereby further improving the plugging effect and the strength of the sealing surface.

[0069] Therefore, the small copper tube drainage plugging method for the oil-immersed transformer heat sink 1 of the embodiment of the present invention maintains the oil pressure inside the heat sink within a safe range to avoid oil blowing bubbles caused by excessive oil pressure during the plugging process, thereby further improving the plugging effect and the firmness of the sealing surface.

[0070] In some embodiments, when using a fast-solidifying oil-resistant metal plugging agent to fill the root of the guide pipe 3, the plugging agent is evenly applied to the root of the guide pipe 3 using special tools or manually, and the filling speed is controlled to ensure that the fast-solidifying oil-resistant metal plugging agent is filled evenly and fully. After filling, the plugging agent is gently tapped or compacted to fully fill all tiny gaps, ensuring that there is no gap between the root of the guide pipe 3 and the oil seepage surface of the heat sink 1.

[0071] In some embodiments, before using the fast-solidifying oil-resistant metal plugging agent to fill the root of the guide pipe 3, the root of the guide pipe 3 is pre-treated by grinding, rust removal, etc. using sandpaper or grinding tools to remove the oxide layer, dirt and rust on the surface of the guide pipe 3. After the pre-treatment, the impurities on the guide pipe 3 are cleaned to ensure that its surface is clean, thereby improving the adhesion and bonding degree of the plugging agent, thereby ensuring that the plugging effect is more durable and reliable.

[0072] In some embodiments, the oil-resistant metal plugging glue is divided into multiple layers for brushing, and it is ensured that each layer is brushed evenly and continuously. The coating thickness of the first n layers of oil-resistant metal plugging glue is 0.1 mm, ensuring that the plugging glue can fully penetrate into the tiny cracks on the surface of the heat sink 1 to form an effective sealing layer. The coating thickness of the last layer of oil-resistant metal plugging glue is greater than 0.1 mm to increase the strength and durability of the plugging area 2 to prevent oil leakage problems caused by factors such as oil pressure and temperature changes during long-term operation.

[0073] In some embodiments, the oil-resistant metal leak-proof glue should be applied evenly and continuously to avoid gaps in the application. There should be an appropriate curing time between each layer of application to reduce defects in the application of the oil-resistant metal leak-proof glue.

[0074] In some embodiments, after the plugging is determined to be successful, the plugging area 2 is regularly inspected and maintained, including but not limited to an appearance inspection of the plugging area 2 and the guide pipe 3 to observe whether there is oil leakage, cracking, falling off, etc., to ensure that there is no oil leakage for a long time.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0079] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sinks, characterized in that: include: Check the heat sink to find the locations where cracks and oil leakage exist and the locations that have been plugged conventionally, and mark them as plugging areas; Clean the plugging area to ensure that there are no impurities and oil accumulation in the plugging area; Making an angled copper guide pipe adapted to the plugging area, selecting one end of the guide pipe as the oil discharge port, and selecting the other end of the guide pipe as the root; Select a stainless steel ball valve to be equipped with the guide pipe, install the ball valve at the oil discharge port of the guide pipe, and ensure that the seal between the ball valve and the guide pipe is intact; The root of the guide pipe is cut to a certain length and is closely fitted with the oil seepage surface of the plugging area, and then the guide pipe is fixed on the heat sink; Use a fast-solidifying oil-resistant metal plugging agent to fill the root of the guide pipe, so that the leaked oil is drained to the oil discharge port through the guide pipe, and the plugging area is kept in a pressure relief state; Use oil-resistant metal plugging glue to brush the root of the guide pipe, brush the next layer of oil-resistant metal plugging glue after the previous layer solidifies, and use n+1 layer-by-layer brushing method to treat the oil seepage surface; Continue for at least 7 days, observe the plugging part formed by the oil-resistant metal plugging glue, and close the stainless steel ball valve when the plugging part solidifies and the seal is intact; Continue to observe the operation of the plugging part for at least 15 days. If there is no oil leakage, it can be considered a successful plugging.

2. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1 is characterized in that: For the location that has been subjected to conventional plugging treatment, the steps of cleaning the plugging area include: Grind off all the original plugging materials and ensure that the heat sink body is not damaged during the operation to prevent unnecessary expansion of the cracks; After lightly grinding the paint layer around the crack, use a cleaning agent to clean the plugging area to remove impurities, oil stains and accumulated oil, so as to confirm the oil leakage location; Use dry air to blow dry the plugged area to ensure that its surface is dry and free of moisture.

3. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 2 is characterized in that: The guide tube is designed to be L-shaped, and the steps of fixing the guide tube on the heat sink include: Along the extension direction of the crack, apply the oil surface repair agent on the edges of both sides of the crack from top to bottom and from far away from the crack to gradually approach the crack to form a groove flow channel; After the oil surface repair agent to be applied is completely solidified, the guide pipe is arranged along the flow channel direction; An oil surface emergency repair agent is pre-buried between the guide pipe and the heat sink in a small amount and multiple times to strengthen the connection between the guide pipe and the heat sink and ensure that the leaking oil is drained into the guide pipe.

4. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 3 is characterized in that: After determining that the plugging is successful, use the ball valve to drain the oil regularly. After confirming that the sealing effect is stable and the oil leakage problem is effectively controlled, install a plug at the oil discharge port of the guide pipe to seal the guide pipe.

5. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1 is characterized in that: Before cleaning the plugging area, stop the radiator and ensure that the oil pressure inside the heat sink has dropped to a safe range to avoid oil bubbles caused by excessive oil pressure during the plugging process, thereby further improving the plugging effect and the firmness of the sealing surface.

6. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1, characterized in that: In the process of filling the root of the guide pipe with the fast-solidifying oil-resistant metal plugging agent, the fast-solidifying oil-resistant metal plugging agent should be filled evenly and fully to ensure that there is no gap between the root of the guide pipe and the oil seepage surface of the heat sink.

7. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1, characterized in that: Before using the fast-setting oil-resistant metal plugging agent to fill the root of the guide pipe, the root of the guide pipe is pre-treated by grinding, rust removal, etc. to improve the adhesion and bonding of the plugging agent, thereby ensuring that the plugging effect is more durable and reliable.

8. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1, characterized in that: The coating thickness of the first n layers of oil-resistant metal plugging glue is 0.1mm, and the coating thickness of the last layer of oil-resistant metal plugging glue is greater than 0.1mm.

9. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1, characterized in that: The oil-resistant metal leak-proof glue should be applied evenly and continuously, and there should be appropriate curing time between each layer.

10. The method for draining and plugging leakage of small copper tubes of oil-immersed transformer heat sink according to claim 1, characterized in that: After confirming that the plugging is successful, the plugging area is regularly inspected and maintained to ensure that there is no oil leakage for a long time.

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