Harmonic-resistant oil-immersed intelligent distribution transformer

Abstract

The application discloses an anti-harmonic oil-immersed intelligent power distribution transformer, relates to the field of transformers, and effectively solves the problems of limited harmonic suppression capacity of existing oil-immersed power distribution transformers and lack of intelligent monitoring and self-adaptive heat dissipation control means. The anti-harmonic oil-immersed intelligent power distribution transformer comprises a box body, the top of the box body is provided with a cover plate, the inside of the box body is provided with a magnetic core and a coil wound on the outer wall of the magnetic core, the connection group of the coil is Dzn0, the top of the coil is provided with a connecting assembly, the bottom of the connecting assembly is fixedly connected with the cover plate, the top of the cover plate is provided with a liquid storage assembly on one side, a group of side heat dissipation fins are arranged on the left and right sides of the box body, a plurality of main heat dissipation assemblies are arranged on the back of the box body, a detection assembly is arranged in the inside of the box body, an intelligent communication module is arranged on the top of the box body, and a support is arranged on the bottom of the box body.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to an anti-harmonic oil-immersed intelligent distribution transformer. Background Technology

[0002] Distribution transformers are core equipment in power systems, responsible for voltage transformation and power distribution. They are widely used in power supply and distribution systems in industrial and mining enterprises, residential communities, and commercial establishments. With the widespread use of power electronic equipment (such as frequency converters, rectifiers, and LED drivers), harmonic pollution in the power grid is becoming increasingly serious. Harmonic currents lead to increased core losses, winding overheating, and accelerated insulation aging in transformers, severely impacting their service life and operational safety. Existing oil-immersed distribution transformers have limited harmonic suppression capabilities. Furthermore, traditional transformers rely heavily on natural convection through the tank walls and passive cooling from heat sinks, resulting in low heat dissipation efficiency. Under harmonic conditions, the internal temperature rise of the transformer is high, easily triggering over-temperature protection and even causing malfunctions. In addition, existing transformers lack intelligent monitoring and adaptive heat dissipation control mechanisms, failing to automatically adjust heat dissipation intensity based on actual operating temperature, oil pressure, and other parameters, leading to both energy waste and insufficient heat dissipation.

[0003] Therefore, there is an urgent need for an anti-harmonic oil-immersed intelligent distribution transformer to solve the above-mentioned technical problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an anti-harmonic oil-immersed intelligent distribution transformer, which effectively solves the problems of limited harmonic suppression capability and lack of intelligent monitoring and adaptive heat dissipation control methods in existing oil-immersed distribution transformers.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes a housing, the top of which is provided with a cover plate, the interior of which is provided with a magnetic core and a coil wound around the outer wall of the magnetic core, the connection group of the coil is Dzn0, the top of the coil is provided with a connecting component, the bottom of the connecting component is fixedly connected to the cover plate, a liquid storage component is provided on one side of the top of the cover plate, a set of side heat dissipation fins are provided on each of the left and right sides of the housing, multiple sets of main heat dissipation components are provided on the rear side of the housing, a detection component is provided inside the housing, an intelligent communication module is provided on the top of the housing, and a support is provided at the bottom of the housing.

[0006] Preferably, the connection assembly includes a set of high-voltage insulating bushings and a set of low-voltage insulating bushings, and each set of high-voltage insulating bushings and low-voltage insulating bushings comprises multiple bushings.

[0007] Preferably, the bottom of the high-voltage insulating sleeve and the low-voltage insulating sleeve are fixedly connected to the cover plate, and the bottom of the high-voltage insulating sleeve and the low-voltage insulating sleeve are fixedly connected to the corresponding coil.

[0008] Preferably, the liquid storage assembly includes an oil tank, the bottom of which is fixedly connected to a cover plate, and a connecting pipe is connected to the bottom of the oil tank, with the bottom of the connecting pipe connected to the cover plate.

[0009] Preferably, the outer circumference of the oil tank is provided with multiple heat dissipation strips.

[0010] Preferably, the main heat dissipation component includes multiple main heat dissipation fins, and each main heat dissipation fin has multiple guide fins on its left and right sides. The bottom spacing of each group of guide fins is greater than the top spacing, and adjacent groups of guide fins are arranged linearly.

[0011] Preferably, the main heat dissipation fins are provided with a heat dissipation channel inside, the top of the heat dissipation channel is connected to a liquid inlet pipe, the liquid inlet pipe penetrates the side wall of the housing, and the inner side of the liquid inlet pipe is connected to a guide port.

[0012] Preferably, a liquid extraction pipe is connected to the bottom of the heat dissipation channel, the liquid extraction pipe penetrates the side wall of the box, and a circulation pump is connected to the inside of the liquid extraction pipe.

[0013] Preferably, the side of the housing away from the circulating pump has an inclined wall.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. Strong anti-harmonic capability: The coil adopts the Dzn0 connection group, which effectively suppresses the impact of harmonics on the transformer, reduces core loss and winding temperature rise, and fundamentally improves the anti-harmonic capability.

[0015] 2. Intelligent Adaptive Heat Dissipation: The detection components monitor the temperature, oil pressure, and liquid level inside the enclosure in real time. The intelligent communication module automatically controls the start and stop of the circulation pump based on the monitoring data. When the internal insulating oil temperature rises, the circulation pump automatically starts, drawing the cooling insulating oil from the main heat dissipation fins into the enclosure. Guided by the inclined wall, it forms a convection flow where the low-temperature oil at the bottom circulates upwards, significantly improving heat dissipation efficiency. When the temperature drops to a set threshold, the circulation pump automatically shuts off, achieving energy-saving operation.

[0016] 3. Synergistic Active and Passive Cooling: The main cooling component employs a forced oil cooling method driven by a circulating pump (active cooling), combined with natural convection cooling through side heat sink fins and oil tank heat exchange strips (passive cooling), forming a multi-stage cooling system. The rear of the enclosure features a single-sided main cooling design without heat sink fins, making it suitable for special installation environments such as wall mounting.

[0017] 4. Enhanced Heat Dissipation with Guide Fins: Two sets of guide fins, narrower at the top and wider at the bottom, are located on either side of the main heat dissipation fins. As the main heat dissipation fins heat up, the density of the heated air decreases, causing it to flow upwards and creating a negative pressure zone at the top. Cooler air at the bottom is drawn in and compressed and accelerated by the guide fins, increasing airflow velocity and improving heat dissipation efficiency. Simultaneously, the guide fins slow down rainwater flow in rainy weather, enabling rain-induced cooling, and also serve as heat conductors, further enhancing heat dissipation performance.

[0018] 5. Liquid Expansion Compensation: The oil tank is connected to the inside of the tank body through a connecting pipe. Utilizing the thermal expansion and contraction characteristics of oil, hot oil enters the oil tank for storage at high temperatures, and then flows back after being actively cooled by the heat dissipation strips on the outer edge of the oil tank, thus achieving natural regulation of oil temperature and volume compensation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0021] Figure 3 This is a front view of the overall structure of the present invention.

[0022] Figure 4 This is a schematic cross-sectional view of the housing of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the main heat dissipation fins of the present invention.

[0024] Figure 6 For the present invention Figure 3 A magnified schematic diagram of the central part of the structure.

[0025] Figure 7 This is a schematic diagram of the structure of the main heat dissipation fins and guide fins of the present invention.

[0026] The following are the labels in the diagram: 1. Housing; 2. Cover plate; 3. High-voltage insulating sleeve; 4. Low-voltage insulating sleeve; 5. Side heat dissipation fins; 6. Oil tank; 7. Heat dissipation strips; 8. Connecting pipe; 9. Bracket; 10. Main heat dissipation fins; 11. Guide fins; 12. Sloping wall; 13. Flow guide; 14. Circulation pump; 15. Heat dissipation channel; 16. Liquid inlet pipe; 17. Liquid extraction pipe. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] This invention proposes an anti-harmonic oil-immersed intelligent distribution transformer: such as Figures 1-3 As shown, the transformer includes a housing 1, which serves as the main outer shell of the transformer. The housing is filled with insulating oil and has no heat dissipation fins on the rear side, employing a single-sided main heat dissipation design. This design is suitable for special installation environments such as wall mounting and corner installation. A cover plate 2 is located on the top of the housing 1, and the housing 1 and cover plate 2 are connected by bolts. Inside the housing 1, there is a magnetic core and a coil wound around the outer wall of the magnetic core. The coil's connection group is Dzn0, meaning the high-voltage side is a delta (D) connection and the low-voltage side is a star (Z) connection with a neutral line (n) drawn out. This results in low zero-sequence impedance, effectively suppressing third and multiples of the third harmonics. A connecting assembly is located on the top of the coil, and the bottom of the connecting assembly... The part is fixedly connected to the cover plate 2. The top side of the cover plate 2 is provided with a liquid storage component. Each of the left and right sides of the box body 1 is provided with a set of side heat dissipation fins 5, which is a passive heat dissipation method that utilizes natural convection heat dissipation. The rear side of the box body 1 is provided with multiple sets of main heat dissipation components, which are active heat dissipation components. The inside of the box body 1 is provided with detection components, including pressure sensors, temperature sensors, and liquid level sensors, for real-time monitoring of operating parameters. The top of the box body 1 is provided with an intelligent communication module, including a controller and a wireless communication module, to realize data acquisition, logic judgment, remote communication, and control of the circulating pump 14. The bottom of the box body 1 is provided with a bracket 9 for supporting and fixing the transformer.

[0029] like Figure 1 and Figure 2 As shown, the connecting assembly includes a set of high-voltage insulating bushings 3 and a set of low-voltage insulating bushings 4. Each set of high-voltage insulating bushings 3 and low-voltage insulating bushings 4 consists of multiple bushings. The bottom of the high-voltage insulating bushings 3 and low-voltage insulating bushings 4 is fixedly connected to the cover plate 2. The bottom of the high-voltage insulating bushings 3 and low-voltage insulating bushings 4 is fixedly connected to the corresponding coil. The high-voltage insulating bushing 3 corresponds to the lead-out end of the high-voltage coil, and the low-voltage insulating bushing 4 corresponds to the lead-out end of the low-voltage coil. The multiple bushing design can meet the needs of multiple incoming and outgoing lines, adapt to different power distribution wiring schemes, and at the same time disperse the lead current and reduce the heat load of a single bushing.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the liquid storage assembly includes an oil tank 6 for storing excess hot insulating oil. The bottom of the oil tank 6 is fixedly connected to the cover plate 2, and the bottom of the oil tank 6 is connected to a connecting pipe 8. The bottom of the connecting pipe 8 is connected to the cover plate 2. When the transformer is running, the insulating oil expands due to heat, and the excess hot oil enters the oil tank 6 for storage through the connecting pipe 8. After the oil temperature drops, the oil contracts, and the cold oil in the oil tank 6 flows back to the tank body 1 through the connecting pipe 8, always keeping the oil level inside the tank body 1 sufficient.

[0031] like Figure 3As shown, multiple heat dissipation strips 7 are arranged around the outer circumference of the oil tank 6. The large number of heat dissipation strips 7 and the large heat dissipation area enable effective heat dissipation even in the absence of wind. After the hot oil entering the oil tank 6 is cooled by the heat dissipation strips 7, its density increases and it automatically flows back to the bottom of the tank body 1, forming a natural convection circulation in which hot oil rises and cold oil falls.

[0032] like Figure 1 , Figure 6 and Figure 7 As shown, the main heat dissipation component includes multiple main heat dissipation fins 10. Each main heat dissipation fin 10 has multiple guide fins 11 on its left and right sides. The bottom spacing of each group of guide fins 11 is greater than the top spacing, that is, the channel between the guide fins 11 has a narrow top and wide bottom shape. Adjacent groups of guide fins 11 are arranged linearly. After the main heat dissipation fins 10 heat up, the air rises, a negative pressure is formed at the top, and cold air is drawn in from the bottom. The narrow top and wide bottom guide fins 11 compress and accelerate the airflow, increase the flow rate, and improve the heat dissipation efficiency. When it rains, the guide fins 11 come into contact with rainwater on the vertical surface, slowing down the flow rate of the rainwater and extending the cooling time. The guide fins 11 conduct the heat of the main heat dissipation fins 10 to a larger area, enhancing heat dissipation.

[0033] like Figure 4 and Figure 5 As shown, the main heat dissipation fins 10 have a heat dissipation channel 15 inside, which provides a channel for the flow of insulating oil. The top of the heat dissipation channel 15 is connected to an inlet pipe 16, which penetrates the side wall of the housing 1. The inner side of the inlet pipe 16 is connected to a guide port 13, which adopts a trapezoidal cross-section structure (the large opening faces the inside of the housing 1, and the small opening faces the heat dissipation channel 15). The large opening facilitates the collection of hot insulating oil, and the small opening uses the cross-section contraction to achieve secondary acceleration and improve the inlet efficiency. The oil enters the heat dissipation channel 15 through the inlet pipe 16, and multiple inlet pipes 16 are interconnected with the guide port 13.

[0034] like Figure 4 , Figure 5 and Figure 7 As shown, a liquid extraction pipe 17 is connected to the bottom of the heat dissipation channel 15. The liquid extraction pipe 17 penetrates the side wall of the housing 1 and discharges the cooled insulating oil in the heat dissipation channel 15. A circulation pump 14 is connected to the inside of the liquid extraction pipe 17. The inside of the liquid extraction pipe 17 is connected to the circulation pump 14 to force the cooled insulating oil into the housing 1.

[0035] like Figure 4As shown, the side of the housing 1 away from the circulating pump 14 is provided with an inclined wall 12. After the circulating pump injects cooling insulating oil into the housing 1, the inclined wall 12 guides the oil flow, causing the cooling oil to slide along the inclined wall 12 to the bottom of the housing 1, forming a low-temperature oil layer at the bottom. At the same time, the hot oil inside the housing 1 rises naturally due to its lower density, forming a directional circulation flow of "bottom cold oil → inclined wall 12 guidance → hot oil rise → guide port 13 collection". This avoids the disorderly diffusion of cooling oil inside the housing 1 after injection. The directional flow is achieved through the inclined wall 12, which greatly improves the cooling efficiency and keeps the bottom of the housing 1 at a low temperature.

[0036] Specifically, the workflow of this invention is divided into four stages: harmonic suppression, real-time detection, intelligent judgment, and heat dissipation execution. Each stage works together to form a complete closed loop.

[0037] After the transformer is energized, the current flows through the coils, generating an alternating magnetic field. The coils in this invention employ a Dzn0 connection group, where the high-voltage side is delta (D) connected, and the third harmonic current forms a circulating current within the delta winding, preventing harmonics from being injected into the external power grid. The low-voltage side is star (Z) connected with a neutral line (N) led out, allowing the third harmonic current to flow smoothly through the neutral line loop. Thus, the third and multiples of the third harmonic are effectively suppressed, the additional losses in the core are significantly reduced, and the winding temperature rise is noticeably decreased. From an electrical principle perspective, heat generation is controlled to a minimum, reducing the burden on subsequent heat dissipation.

[0038] During transformer operation, the detection components installed inside tank 1 operate continuously. A temperature sensor monitors the temperature of the insulating oil in real time, a pressure sensor monitors the oil pressure inside tank 1 in real time, and a level sensor monitors the level of the insulating oil in real time. Data collected by these three sensors is transmitted in real time via electrical circuits to the controller in the intelligent communication module. The controller receives, stores, and analyzes the data, providing data support for intelligent judgment in the next stage. Simultaneously, the wireless communication module uploads the operating data to a remote monitoring platform, allowing maintenance personnel to view the transformer's operating status at any time.

[0039] The controller compares real-time data from the detection components with a preset temperature threshold and automatically determines the appropriate heat dissipation strategy. When the temperature of the insulating oil is lower than the first threshold T1, it is determined to be in normal operation. The controller issues a command to shut down the circulating pump 14, and the transformer relies solely on passive heat dissipation to maintain temperature balance. When the temperature of the insulating oil is between T1 and the second threshold T2, it is determined to be a temperature rise state. The controller issues a command to start the circulating pump 14 to run at low speed, and the forced oil cooling heat dissipation system starts to work. When the temperature of the insulating oil reaches or exceeds T2, it is determined to be a high-temperature operating state. The controller issues a command to make the circulating pump 14 run at full speed, and at the same time sends a high-temperature alarm to the remote monitoring platform through the wireless communication module. When the pressure sensor detects an abnormal oil pressure, the controller immediately shuts down the circulation pump 14 and sends a fault alarm. When the level sensor detects that the oil level is too low, the controller sends an oil replenishment alarm and shuts down the circulation pump 14 to prevent damage to the equipment caused by insufficient oil operation.

[0040] In addition, maintenance personnel can also manually send control commands through the remote monitoring platform. After receiving the remote commands, the controller will forcibly start and stop the circulating pump 14, thus realizing remote manual intervention.

[0041] When the circulating pump 14 is shut down, it relies solely on passive cooling to maintain operation. The side cooling fins 5 on both sides of the housing 1 utilize natural convection to dissipate heat from the side walls of the housing 1 into the air. Simultaneously, the hotter insulating oil inside the housing 1, due to its lower density, rises to the top and enters the oil tank 6 on the cover plate 2 through the connecting pipe 8. Numerous cooling strips 7 arranged circumferentially around the outer edge of the oil tank 6 naturally cool the hot oil. After cooling, the denser insulating oil flows back to the bottom of the housing 1 through the connecting pipe 8, forming a natural convection cycle of "hot oil rising → oil tank 6 cooling → cold oil descending." This mode operates with zero energy consumption and is suitable for low-load or low-temperature operating conditions. After the circulating pump 14 starts, the forced oil cooling circulation system begins to work, and the specific process is as follows: Step 1: Cooling oil injection. The circulating pump 14 extracts the cooled insulating oil from the heat dissipation channel 15 inside the main heat dissipation fins 10 and pumps it into the housing 1 through the extraction pipe 17.

[0042] Step 2: Sloping wall 12 guides the flow of cooling insulating oil. The pumped cooling insulating oil encounters the sloping wall 12 inside the housing 1. The sloping wall 12 guides the oil flow, causing the cooling oil to slide along the sloping wall 12 to the bottom of the housing 1, where a low-temperature oil layer is formed.

[0043] Step 3: Hot oil rise and collection. The original thermal insulating oil inside the housing 1, due to its lower density, naturally rises to the top. The rising hot oil is collected through the guide port 13 inside the inlet pipe 16. The guide port 13 adopts a trapezoidal cross-section structure, with the larger opening facing the inside of the housing 1 for efficient collection of hot oil, and the smaller opening facing the heat dissipation channel 15 to achieve secondary acceleration of the oil by utilizing the cross-sectional contraction, thereby improving the inlet efficiency.

[0044] Step 4: Cooling through heat dissipation channel 15. After the hot oil enters the heat dissipation channel 15 inside the main heat dissipation fin 10, it exchanges heat with the metal wall of the main heat dissipation fin 10, and the oil temperature gradually decreases.

[0045] Step 5: Guide fins 11 accelerate heat dissipation. After the main heat dissipation fins 10 heat up, the surrounding air is heated, its density decreases, and it rises, forming a negative pressure zone at the top of the main heat dissipation fins 10. The cool air at the bottom is drawn in and flows upward across the surface of the main heat dissipation fins 10. The guide fins 11 on the left and right sides of the main heat dissipation fins 10 have a larger bottom spacing than top spacing, forming a narrower top and wider bottom shape. This creates a compression channel effect on the rising airflow, causing the airflow to be compressed and accelerated as it passes through the guide fins 11, increasing the flow velocity and significantly improving the convective heat dissipation efficiency. At the same time, the guide fins 11 can slow down the flow rate of rainwater in rainy weather, prolonging the contact time between rainwater and the main heat dissipation fins 10, achieving a rain cooling effect; the guide fins 11 can also conduct heat from the main heat dissipation fins 10 to a larger area, playing an auxiliary role in heat conduction.

[0046] Step 6: Circulation. The insulating oil cooled in the heat dissipation channel 15 is drawn out again by the circulation pump 14 and pumped back into the housing 1, forming a closed-loop forced circulation of "bottom cold oil → inclined wall 12 guide → hot oil rise → guide port 13 collect → heat dissipation channel 15 cool → circulation pump 14 pump", which continuously reduces the internal temperature of the housing 1.

[0047] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0050] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A harmonic-resistant oil-immersed intelligent distribution transformer, comprising a housing (1), a cover plate (2) on the top of the housing (1), a magnetic core and a coil wound around the outer wall of the magnetic core inside the housing (1), wherein the connection group of the coil is Dzn0, characterized in that: The top of the coil is provided with a connecting component, the bottom of the connecting component is fixedly connected to the cover plate (2), the top side of the cover plate (2) is provided with a liquid storage component, the left and right sides of the box (1) are each provided with a set of side heat dissipation fins (5), the rear side of the box (1) is provided with multiple sets of main heat dissipation components, the inside of the box (1) is provided with a detection component, the top of the box (1) is provided with a smart communication module, and the bottom of the box (1) is provided with a bracket (9).

2. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 1, characterized in that: The connection assembly includes a set of high-voltage insulating bushings (3) and a set of low-voltage insulating bushings (4), and there are multiple sets of each set of high-voltage insulating bushings (3) and low-voltage insulating bushings (4).

3. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 2, characterized in that: The bottom of the high-voltage insulating sleeve (3) and the low-voltage insulating sleeve (4) are fixedly connected to the cover plate (2), and the bottom of the high-voltage insulating sleeve (3) and the low-voltage insulating sleeve (4) are fixedly connected to the corresponding coil.

4. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 1, characterized in that: The liquid storage assembly includes an oil tank (6), the bottom of which is fixedly connected to a cover plate (2), and a connecting pipe (8) is connected to the bottom of the oil tank (6), the bottom of which is connected to the cover plate (2).

5. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 4, characterized in that: The outer circumference of the oil tank (6) is provided with multiple heat dissipation strips (7).

6. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 1, characterized in that: The main heat dissipation component includes multiple main heat dissipation fins (10), and multiple guide fins (11) are provided on the left and right sides of each main heat dissipation fin (10). The bottom spacing of each group of guide fins (11) is greater than the top spacing, and adjacent groups of guide fins (11) are arranged linearly.

7. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 6, characterized in that: The main heat dissipation fin (10) has a heat dissipation channel (15) inside. The top of the heat dissipation channel (15) is connected to an inlet pipe (16). The inlet pipe (16) penetrates the side wall of the box (1). The inner side of the inlet pipe (16) is connected to a guide port (13).

8. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 7, characterized in that: The bottom of the heat dissipation channel (15) is connected to a liquid extraction pipe (17), which penetrates the side wall of the box (1). The inner side of the liquid extraction pipe (17) is connected to a circulation pump (14).

9. The anti-harmonic oil-immersed intelligent distribution transformer according to claim 8, characterized in that: The housing (1) has an inclined wall (12) on the side away from the circulating pump (14).

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