A transformer oil leakage detection method

Abstract

The application discloses a transformer oil leakage detection method applied to the detection field, which is characterized in that: the detection oil roll is embedded between the heat dissipation scales, then the medium is filled in to make the detection oil roll expand and contact the heat dissipation scales, then the magnetic field is added, so that the detection oil roll continuously extrudes and rubs the surface of the heat dissipation scales, thereby generating a pushing force on the deposited dust and the condensation block of the oil seepage point, and the oil seepage point is shifted and dropped, so that the leakage point can continue to seep out the transformer oil, then through the repeated operation of releasing the medium and filling the medium again, the position between the detection oil roll and the heat dissipation scales can be adjusted, the extrusion contact state is maintained for a period of time, and then the oil seeped out of the leakage point can leave obvious marks on the surface of the detection oil roll, compared with the prior art, the oil leakage in the small gap can be converted into the observation of the marks on the surface of the detection oil roll with the position being changed at will, thereby the difficulty of oil leakage detection is greatly reduced, and the situation that the oil leakage point is ignored is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of testing, and in particular to a method for detecting transformer oil leakage. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Transformers can be classified according to their uses as follows: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type transformer test transformers, angle transformers, high-current transformers, excitation transformers, etc.

[0003] To ensure heat dissipation, oil-immersed transformers are often equipped with multiple heat dissipation fins on their surface. Due to the relatively small gaps between the heat dissipation fins and the accumulation of dust on the transformer surface, when the end face of the heat dissipation fin facing inward cracks and causes transformer oil to overflow, the initial oil leakage is small and easily absorbed and condensed by the accumulated dust, making it difficult to drip off. In the environment of many small gaps, it is difficult for staff to carry out maintenance, and it is easy to overlook the oil leakage point. Summary of the Invention

[0004] The purpose of this application is to reduce the difficulty of detecting oil leaks during maintenance. Compared with existing technologies, it provides a method for detecting transformer oil leaks, including the following steps:

[0005] S1. First, select a suitable oil testing coil according to the size of the transformer to be tested, and then unfold the oil testing coil and install it into the gap between multiple heat dissipation fins on the transformer.

[0006] S2. Then, a medium is filled into the oil detection roll, causing the part of the oil detection roll located between the two heat dissipation fins to expand and press against the heat dissipation fins, thereby generating a pushing force on the deposited dust and the condensed clumps at the oil seepage points.

[0007] S3. Apply an external magnetic field to the outside of the oil detection roll and continuously move the position of the applied magnetic field up and down so that the expanded part of the oil detection roll continuously rubs and contacts the inner wall of the heat dissipation fins.

[0008] S4. Release some medium, then refill with medium to make the oil detection coil press against the heat dissipation fins again. After standing for a period of time, remove the oil detection coil and observe the marks on the surface of the oil detection coil to determine whether the transformer is leaking oil and the location of the leak.

[0009] By embedding an oil detection coil between heat dissipation fins and then filling it with a medium to expand it and decompress it into contact with the fins, an external magnetic field is applied. This causes the oil detection coil to continuously press and rub against the surface of the heat dissipation fins, pushing the deposited dust and oil clumps at the leak point to fall off and shift, allowing transformer oil to continue to seep from the leak point. By repeatedly releasing and refilling the medium, the position between the oil detection coil and the heat dissipation fins can be adjusted to maintain a state of pressure contact for a period of time. This ensures that the oil seeping from the leak point leaves a clear mark on the surface of the oil detection coil. Compared with existing technologies, this method transforms the observation of oil leaks from small gaps into the observation of marks on the surface of an oil detection coil that can be moved at will, thus significantly reducing the difficulty of oil leak detection and effectively preventing oil leaks from being overlooked.

[0010] Furthermore, in step S3, before applying the external magnetic field, the upper and lower ends of the oil detection roll are fixed and limited. This can be done by adding external brackets and bolts, or by bonding. The fixing method is existing technology and will not be elaborated on here. By limiting the position of the oil detection roll, it is not easy for its two ends to shift when the external magnetic field is applied.

[0011] Furthermore, in step S4, the amount of medium released does not exceed 1 / 3 of the actual amount filled, and after releasing part of the medium, the oil detection roll just comes into contact with the adjacent heat dissipation fins. This effectively ensures that when an external magnetic field is applied, the oil detection wiping strip can fully rub against the inner wall of the heat dissipation fins, thereby effectively eliminating some dust and the oil-dust condensation points at the oil seepage points. This makes the oil seepage phenomenon more obvious during detection, making it easier to detect. In addition, the amount of medium refilled is not less than the amount of medium released, so that after refilling the medium, it effectively ensures that the oil detection wiping strip is in full contact with the inner wall of the heat dissipation fins, making the oil seepage point more fully contacted by the oil detection wiping strip and leaving a clearer mark.

[0012] Furthermore, the oil detection roll includes multiple oil detection strips. Limiting tubes and limiting ropes are fixedly connected between the ends of two adjacent oil detection strips on the same side. The limiting tubes and limiting ropes on the same side of the multiple oil detection strips are spaced apart, with the limiting tubes and ropes having the same length. The limiting tubes connect two adjacent oil detection strips, allowing the multiple oil detection strips to be connected end-to-end. This means that when filling with medium, only one oil detection strip with an opening needs to be filled to achieve the effect of filling both left and right oil detection strips with medium, effectively reducing the amount of operation required. Additionally, the limiting ropes connect two adjacent oil detection strips, ensuring that the positions of the two adjacent oil detection strips are stable and less prone to large-scale displacement under the combined action of the limiting tubes and limiting ropes.

[0013] Furthermore, the oil detection strip includes two hollow fixed sections and an oil detection moving section fixedly connected between the two hollow fixed sections. Both oil detection strips located on the left and right sides of the oil detection roll are provided with openings. One opening is located on the upper hollow fixed section of one oil detection strip, and the other opening is located on the lower hollow fixed section of the other oil detection strip. The openings, hollow fixed sections, and oil detection moving sections are interconnected, allowing the medium to enter through one opening, flow through multiple oil detection strips and limiting pipes in sequence, and then flow out through the other opening, making the release of the medium smoother.

[0014] Furthermore, the oil detection section includes an outer expansion oil detection layer on the outside and an inner liquid-conducting layer on the inside. The inner liquid-conducting layer is fixedly connected between the close ends of the two hollow fixed sections. Multiple air holes are drilled in the inner liquid-conducting layer, which are connected to the hollow fixed sections. The outer expansion oil detection layer has a light-colored elastic sealing structure, which allows the transformer oil to leave a relatively obvious mark on its surface after overflowing, making it easy to detect oil leaks in time. The inner liquid-conducting layer has an elastic porous tubular structure, preferably a rubber structure similar to a pressure pulse band, which gives the inner liquid-conducting layer greater elasticity, making it less likely to change its overall longitudinal span when filled with medium. This effectively ensures the position of the oil detection strip between two adjacent heat dissipation fins. At the same time, the inner liquid-conducting layer is used to transfer the medium. When the medium is filled, the medium first enters the inner liquid-conducting layer through the hollow fixed section, and then overflows from the gaps on the surface of the inner liquid-conducting layer and diffuses into the outer expansion oil detection layer, causing the outer expansion oil detection layer to expand, thereby achieving extrusion contact with the heat dissipation fins.

[0015] Furthermore, multiple uniformly distributed magnetic sheets are fixedly connected to the surface of the inner liquid layer. There is a mutual attraction between the magnetic sheets and the external magnetic field. The magnetic sheets make the inner liquid layer magnetic. When the external magnetic field is applied, by moving the magnetic field, different parts of the inner liquid layer can be driven to bulge outward, thereby achieving friction with the heat dissipation fins and effectively ensuring the accuracy of oil leakage detection.

[0016] Furthermore, the magnetic sheet is located on the inner surface of the outer expansion oil detection layer, and the surface of the outer expansion oil detection layer is bonded with short fibers with oil absorption properties, giving the magnetic sheet surface a certain degree of adsorption. When there is oil leakage on the side wall of the heat dissipation fins, the seeping oil can be adsorbed by the short fibers with oil absorption properties, thereby making the detection effect of the oil leakage point more accurate.

[0017] Compared to existing technologies, the advantages of this application are:

[0018] (1) By embedding the oil detection roll between the heat dissipation fins, and then filling it with a medium to expand it and decompress it into contact with the heat dissipation fins, and then applying an external magnetic field, the oil detection roll is continuously squeezed and rubbed against the surface of the heat dissipation fins, thereby generating a pushing force on the deposited dust and the condensate at the oil seepage point, causing it to fall and shift, so that the leak point can continue to seep transformer oil. Afterwards, by repeatedly releasing and refilling the medium, the position between the oil detection roll and the heat dissipation fins can be adjusted to maintain a state of squeezed contact for a period of time, so that the oil seeping from the leak point can leave a clear mark on the surface of the oil detection roll. Compared with the existing technology, the observation of oil leakage through small gaps can be transformed into the observation of the mark on the surface of the oil detection roll, which can be moved at will, thereby greatly reducing the difficulty of oil leakage detection and effectively avoiding the situation where the oil leakage point is overlooked.

[0019] (2) In step S4, the amount of medium released does not exceed 1 / 3 of the actual amount filled. After releasing part of the medium, the oil detection roll just contacts the adjacent heat dissipation fins. This effectively ensures that when an external magnetic field is applied, the oil detection strip can fully rub against the inner wall of the heat dissipation fins, thereby effectively eliminating some dust and the oil-dust condensation points at the oil seepage points. This makes the oil seepage phenomenon more obvious during detection and easier to detect. In addition, the amount of medium refilled is not less than the amount of medium released. After refilling the medium, this effectively ensures that the oil detection strip is in full contact with the inner wall of the heat dissipation fins, making the oil seepage point more fully contacted by the oil detection strip and leaving a clearer mark.

[0020] (3) Multiple oil detection strips are connected end to end, so that when filling the medium, only one oil detection strip with an opening needs to be filled to achieve the effect that both oil detection strips on the left and right are filled with the medium, thereby effectively reducing the amount of operation when filling the medium. In addition, the limiting rope is used to connect two adjacent oil detection strips, so that under the combined action of the limiting pipe and the limiting rope, the positions of the two adjacent oil detection strips are stable and not prone to large-scale displacement.

[0021] (4) The outer expansion oil detection layer is a light-colored elastic sealing structure, which can leave relatively obvious marks on its surface after the transformer oil overflows, making it easy to detect the oil leak in time. The inner liquid flow layer is an elastic porous tubular structure, preferably a rubber structure similar to a pressure pulse belt, which makes the inner liquid flow layer have greater elasticity, so that its overall longitudinal span is not easily changed when the medium is filled, thereby effectively ensuring the position of the oil detection strip between two adjacent heat dissipation fins. At the same time, the inner liquid flow layer is used to transfer the medium. When the medium is filled, the medium first enters the inner liquid flow layer through the hollow fixed section, and then overflows from the gaps on the surface of the inner liquid flow layer and diffuses into the outer expansion oil detection layer, causing the outer expansion oil detection layer to expand, thereby achieving the squeezing contact between the outer expansion oil detection layer and the heat dissipation fins.

[0022] (5) Multiple uniformly distributed magnetic sheets are fixedly connected to the surface of the inner liquid layer. There is a mutual attraction between the magnetic sheets and the external magnetic field. By setting the magnetic sheets, the inner liquid layer becomes magnetic. When the external magnetic field is applied, by moving the magnetic field, different parts of the inner liquid layer can be driven to bulge outward, thereby achieving friction with the heat dissipation fins, effectively ensuring the accuracy of oil leakage detection.

[0023] (6) The magnetic sheet is located on the inner surface of the outer expansion oil detection layer. The surface of the outer expansion oil detection layer is bonded with short fibers with oil absorption properties, which makes the surface of the magnetic sheet have a certain degree of adsorption. When there is oil leakage on the side wall of the heat dissipation fins, the seeping oil can be adsorbed by the short fibers with oil absorption properties, thereby making the detection effect of the oil leakage point more accurate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the detection process structure in this application;

[0025] Figure 2 This is a flowchart illustrating the testing process of this application;

[0026] Figure 3 This is a schematic diagram of the structure after the oil inspection coil of this application is installed on the transformer;

[0027] Figure 4 This is a structural schematic diagram of the cross-section of the oil inspection roll in this application;

[0028] Figure 5 This is a structural diagram of the front of the oil testing roll of this application;

[0029] Figure 6 This is a schematic diagram of the structure of the oil testing coil in this application when it is filled with the medium;

[0030] Figure 7 This is a structural schematic diagram of the front side of the oil detection wiping strip in this application;

[0031] Figure 8 This is a schematic diagram of the cross-section of the oil-detecting wiping strip in this application.

[0032] Explanation of the labels in the diagram:

[0033] 1. Oil detection strip, 11. Hollow fixed section, 12. Oil detection moving section, 121. External expansion oil detection layer, 122. Internal liquid flow layer, 13. Limiting pipe, 14. Limiting rope, 2. Opening, 3. Magnetic plate. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] Example 1:

[0036] This application discloses a method for detecting transformer oil leakage. Please refer to [link / reference]. Figure 1-2 In the diagram, 'a' represents a heat dissipation fin, which includes the following steps:

[0037] S1. First, select a suitable oil testing coil based on the size of the transformer to be tested, such as... Figure 3 Then the oil testing roll is unrolled and installed into the gap between multiple heat dissipation fins on the transformer;

[0038] S2. Then, a medium is filled into the oil detection roll, causing the part of the oil detection roll located between the two heat dissipation fins to expand and press against the heat dissipation fins, thereby generating a pushing force on the deposited dust and the condensed clumps at the oil seepage points.

[0039] S3. Apply an external magnetic field to the outside of the oil detection roll and continuously move the position of the applied magnetic field up and down so that the expanded part of the oil detection roll continuously rubs and contacts the inner wall of the heat dissipation fins.

[0040] S4. Release some medium, then refill with medium to make the oil detection coil press against the heat dissipation fins again. After standing for a period of time, remove the oil detection coil and observe the marks on the surface of the oil detection coil to determine whether the transformer is leaking oil and the location of the leak.

[0041] In step S3, before applying the external magnetic field, the upper and lower ends of the oil detection roll are fixed and limited. This can be done by adding an external bracket and bolts, or by adhesive bonding. The fixing method is existing technology and will not be elaborated here. By limiting the position of the oil detection roll, the two ends are not easily displaced when the external magnetic field is applied. In step S4, the amount of medium released does not exceed 1 / 3 of the actual filling amount. After releasing part of the medium, the oil detection roll just makes contact with the adjacent heat dissipation fins. This effectively ensures that when the external magnetic field is applied, the oil detection wiping strip 1 can fully rub against the inner wall of the heat dissipation fins, thereby effectively eliminating some dust and the oil-dust condensation points at the oil seepage points. This makes the oil seepage phenomenon more obvious during detection and easier to detect. In addition, the amount of medium refilled is not less than the amount of medium released. After refilling the medium, it effectively ensures that the oil detection wiping strip 1 makes full contact with the inner wall of the heat dissipation fins, making the oil seepage point more fully contacted with the oil detection wiping strip 1 and leaving a clearer mark.

[0042] like Figure 4-5 The oil detection roll includes multiple oil detection strips 1. A limiting tube 13 and a limiting rope 14 are fixedly connected between the ends of two adjacent oil detection strips 1 on the same side. The limiting tubes 13 and limiting ropes 14 on the same side of the multiple oil detection strips 1 are spaced apart. The limiting tubes 13 and limiting ropes 14 are of the same length, and the limiting tubes 13 connect two adjacent oil detection strips 1. Figure 6 The arrows in the diagram indicate the direction of medium movement, allowing multiple oil detection strips 1 to be connected end to end. This means that when filling with medium, only one oil detection strip 1 with an opening 2 needs to be filled to achieve the effect that both left and right oil detection strips 1 are filled with medium, thus effectively reducing the amount of operation required when filling with medium. In addition, the limiting rope 14 is used to connect two adjacent oil detection strips 1, so that under the combined action of the limiting tube 13 and the limiting rope 14, the positions of two adjacent oil detection strips 1 are stable and not prone to large-scale displacement.

[0043] Please see Figure 7-8 The oil detection strip 1 includes two hollow fixed sections 11 and an oil detection moving section 12 fixedly connected between the two hollow fixed sections 11. Both oil detection strips 1 located on the left and right sides of the oil detection roll are provided with openings 2. One opening 2 is located on the upper hollow fixed section 11 of one oil detection strip 1, and the other opening 2 is located on the lower hollow fixed section 11 of the other oil detection strip 1. The openings 2, the hollow fixed sections 11 and the oil detection moving section 12 are interconnected, so that the medium can enter through one of the openings 2, flow through multiple oil detection strips 1 and the limiting pipe 13 in sequence, and then flow out through the other opening 2, so that the release of the medium can be smoother.

[0044] The oil detection section 12 includes an outer expansion oil detection layer 121 on the outer side and an inner liquid-conducting layer 122 on the inner side. The inner liquid-conducting layer 122 is fixedly connected between the close ends of two hollow fixed sections 11. Multiple air holes are drilled in the inner liquid-conducting layer 122, which communicate with the hollow fixed sections 11. The outer expansion oil detection layer 121 has a light-colored, elastic sealing structure, allowing transformer oil to leave relatively obvious marks on its surface after overflow, facilitating timely detection of leaks. The inner liquid-conducting layer 122 has an elastic, porous tubular structure, preferably a rubber structure similar to a pressure band, giving it greater elasticity and preventing changes in its overall longitudinal span during medium filling. This effectively ensures the position of the oil detection strip 1 between adjacent heat dissipation fins. Simultaneously, the inner liquid-conducting layer 122 is used to transfer the medium. During medium filling, the medium first enters the inner liquid-conducting layer 122 through the hollow fixed sections 11, and then flows from... The voids on the surface of the inner liquid layer 122 overflow and diffuse into the outer expansion detection layer 121, causing the outer expansion detection layer 121 to expand, thereby achieving extrusion contact with the heat dissipation fins. Multiple uniformly distributed magnetic sheets 3 are fixedly connected to the surface of the inner liquid layer 122. There is a mutual attraction between the magnetic sheets 3 and the external magnetic field. Through the setting of the magnetic sheets 3, the inner liquid layer 122 becomes magnetic. When the external magnetic field is applied, by moving the magnetic field, different parts of the inner liquid layer 122 can be driven to bulge outward, thereby achieving friction with the heat dissipation fins and effectively ensuring the accuracy of oil leakage detection. The magnetic sheets 3 are located on the inner surface of the outer expansion detection layer 121. The surface of the outer expansion detection layer 121 is adhered with oil-absorbing short fibers, giving the surface of the magnetic sheets 3 a certain degree of adsorption. When there is oil leakage on the side wall of the heat dissipation fins, the seeping oil can be adsorbed by the oil-absorbing short fibers, thereby making the detection effect of oil leakage more accurate.

[0045] By using an oil detection roll, when it is necessary to detect oil leakage on the inner wall of the transformer's heat dissipation fins, the oil detection roll can be embedded between the heat dissipation fins. After filling with a medium, it expands and decompresses into contact with the heat dissipation fins. Then, an external magnetic field is applied, which controls the oil detection roll to continuously squeeze and rub against the surface of the heat dissipation fins. This generates a pushing force on the deposited dust and condensed oil at the seepage point, causing the condensed points and some dust to fall off and shift, allowing transformer oil to continue to seep out from the leak point. By repeatedly releasing and refilling the medium, the position between the oil detection roll and the heat dissipation fins can be adjusted to maintain a state of squeezed contact for a period of time. This allows the oil seeping from the leak point to leave a clear mark on the surface of the oil detection roll. Compared with existing technologies, this method transforms the observation of oil leakage through small gaps into the observation of the mark on the surface of the oil detection roll, which can be moved at will, thus greatly reducing the difficulty of oil leakage detection and effectively preventing oil leakage points from being overlooked.

[0046] It is also worth noting that when oil detection coils are used for oil leak detection, the medium can be either air or liquid, and the medium can be kept at room temperature. In special cases, oil detection coils can also be used as temporary external heat sinks. After being installed on the transformer, the medium can be low-temperature water. By circulating water moving inside the oil detection coil, the heat dissipation of the transformer can be temporarily accelerated.

[0047] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A transformer oil leakage detection method, characterized by, The method comprises the following steps: S1, first, according to the size of the transformer to be detected, a suitable oil detection roll is selected, then the oil detection roll is unfolded and installed into the gap between the multiple heat dissipation scales on the transformer; S2, then, the oil detection roll is filled with medium, the part of the oil detection roll between the two heat dissipation scales is expanded, and is in extrusion contact with the heat dissipation scales, thereby generating a pushing force on the deposited dust and the condensation block of the oil seepage point; S3, an external magnetic field is applied to the oil detection roll, and the position of the external magnetic field is moved up and down continuously, so that the expanded part of the oil detection roll is in friction contact with the inner wall of the heat dissipation scale continuously; S4, a part of the medium is released, then the medium is filled again, so that the oil detection roll is in extrusion contact with the heat dissipation scale again, after a period of standing, the oil detection roll is taken out, and the mark on the surface of the oil detection roll is observed to determine whether the transformer is leaking oil and the position of the oil leakage.

2. The transformer oil leakage detection method of claim 1, wherein In the step S3, the upper and lower ends of the oil detection roll are fixed and limited before the external magnetic field is applied.

3. The transformer oil leakage detection method of claim 1, wherein, In the step S4, the amount of the released medium is not more than 1 / 3 of the actual filled amount, and after the part of the medium is released, the oil detection roll is in contact with the adjacent heat dissipation scale; in addition, the amount of the filled medium again is not less than the amount of the released medium.

4. The transformer oil leakage detection method of claim 1, wherein The oil detection roll comprises multiple oil detection wipers (1), the end portions between the adjacent two oil detection wipers (1) on the same side are fixedly connected with a limiting tube (13) and a limiting rope (14) respectively, and the limiting tube (13) and the limiting rope (14) on the same side of the multiple oil detection wipers (1) are distributed at intervals.

5. The transformer oil leakage detection method of claim 4, wherein, The limiting tube (13) and the limiting rope (14) have the same length, and the limiting tube (13) communicates the adjacent two oil detection wipers (1).

6. The transformer oil leakage detection method of claim 5, wherein, The oil detection wiper (1) comprises two hollow fixed sections (11) and an oil detection movable section (12) fixedly connected between the two hollow fixed sections (11), and two oil detection wipers (1) on the left and right sides of the oil detection roll are provided with openings (2), one of the openings (2) is located on the upper end hollow fixed section (11) of one of the oil detection wipers (1), and the other opening (2) is located on the lower end hollow fixed section (11) of the other oil detection wiper (1), and the openings (2), the hollow fixed sections (11) and the oil detection movable section (12) are in communication with each other.

7. The transformer oil leakage detection method of claim 6, wherein The oil detection movable section (12) comprises an outer expansion oil detection layer (121) located on the outer side and an inner liquid passing layer (122) located on the inner side, the inner liquid passing layer (122) is fixedly connected between the end portions of the two hollow fixed sections (11) close to each other, a plurality of air holes are opened in the inner liquid passing layer (122), and the air holes are in communication with the hollow fixed sections (11).

8. The transformer oil leakage detection method of claim 7, wherein, The outer expansion oil detection layer (121) is a light-colored elastic sealing structure, and the inner liquid passing layer (122) is an elastic porous tubular structure.

9. The transformer oil leakage detection method of claim 7, wherein, A plurality of uniformly distributed magnetic sheets (3) are fixedly connected to the surface of the inner liquid passing layer (122), and the magnetic sheets (3) and the external magnetic field have mutual adsorption force.

10. The transformer oil leakage detection method of claim 9, wherein, The magnetic sheets (3) are located on the inner surface of the outer expansion oil detection layer (121), and the surface of the outer expansion oil detection layer (121) is bonded with oil-absorbing short fibers.

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