Heat dissipation structure of underground distribution transformer

Abstract

The present invention provides a heat dissipation structure of an underground distribution transformer, which belongs to the technical field of electric power equipment, and includes a transformer body, an air circulation system, and a water circulation refrigeration system; the transformer body is arranged in a pit, and a temperature difference generator is arranged on the outer wall of the transformer body; the air circulation system includes an air treatment device, a plurality of air cooling pipelines connected to the air treatment device, and an air outlet pipe, and the air outlet pipe is connected to the outside; the water circulation refrigeration system includes a water circulation pipeline, a driving pump and an electric refrigerator sequentially arranged on the water circulation pipeline, and the water circulation pipeline is connected to the air treatment device; the electric refrigerator is electrically connected to the temperature difference generator. The heat dissipation structure of the underground distribution transformer provided by the present invention cools the transformer with the help of the air circulation system and the water circulation refrigeration system, improves the cooling effect, and maintains the temperature in the pit at a relatively constant temperature value, which is beneficial to ensure the cooling effect of the transformer body.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment, and more specifically, relates to a heat dissipation structure of an underground distribution transformer. Background Art

[0002] The buried transformer is installed in a pit below the outdoor ground level, and the distribution cabinet is set on the ground surface above the pit, avoiding direct contact between the transformer and the public. The high-voltage cables for urban network reconstruction, new residential areas, and new urbanization construction are all laid underground, which is very convenient to connect with the buried distribution transformer. The buried distribution transformer is allowed to be submerged in water for a certain period of time and operate below 0.5m, which can resist flood disasters and effectively improve the reliability of the power supply system.

[0003] However, the underground distribution transformer is located below the ground surface, and the air circulation in the pit is inconvenient, and its natural heat dissipation effect is poor, which increases the temperature in the pit and affects the normal operation of the transformer. In the prior art, an exhaust fan is usually installed in the pit to solve the heat dissipation problem of the underground distribution transformer, but due to the influence of ambient temperature and inconvenient ventilation, the heat dissipation effect of the exhaust fan is not good. Summary of the invention

[0004] The object of the present invention is to provide a heat dissipation structure for an underground distribution transformer, aiming to solve the problem of poor heat dissipation effect of the underground distribution transformer.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a heat dissipation structure of an underground distribution transformer, comprising:

[0006] A transformer body, wherein the transformer body is arranged in a pit, and a temperature difference generator is arranged on an outer wall of the transformer body;

[0007] An air circulation system, the air circulation system comprising an air treatment device connected to the outside, an air cooling pipeline connected to the air treatment device, and an air outlet pipe connected to the air cooling pipeline, the air outlet pipe being connected to the outside;

[0008] A water circulation refrigeration system, the water circulation refrigeration system includes a water circulation pipeline, a driving pump and an electric refrigerator which are arranged on the water circulation pipeline in sequence, the water circulation pipeline is connected to the air treatment equipment and is used to cool the air in the air treatment equipment; the electric refrigerator is electrically connected to the temperature difference generator.

[0009] As another embodiment of the present application, a plurality of horizontal heat-conducting fins are longitudinally spaced apart on the two outer side walls of the transformer body, and the air-cooling pipeline is arranged on one side of the heat-conducting fins; the heat-conducting fins are spaced apart from the temperature difference generator.

[0010] As another embodiment of the present application, the air cooling pipeline is arranged between two adjacent heat conducting fins.

[0011] As another embodiment of the present application, the air circulation system further includes:

[0012] An air inlet buffer chamber, the air inlet buffer chamber is located at one end of the transformer body close to the air handling device, and both ends of the air inlet buffer chamber are respectively connected to a plurality of the air cooling pipelines and connecting pipes, and the connecting pipes are connected to the air handling device;

[0013] An air outlet buffer chamber is located at one end of the transformer body close to the air outlet pipe, and two ends of the air outlet buffer chamber are respectively connected to a plurality of the air cooling pipelines and the air outlet pipe.

[0014] As another embodiment of the present application, ventilation holes are provided on both the air inlet buffer cavity and the air outlet buffer cavity.

[0015] As another embodiment of the present application, the hot end of the thermoelectric generator is connected to the side wall of the transformer body, and the cold end of the thermoelectric generator extends into the soil outside the pit.

[0016] As another embodiment of the present application, the air treatment equipment includes:

[0017] An air inlet cavity, wherein an air filter and an air drying layer located at the rear side of the air filter are arranged in the air inlet cavity; an air inlet pipe is arranged at the front end of the air inlet cavity, and the air treatment device is connected to the outside world by means of the air inlet pipe;

[0018] A heat exchange chamber, the heat exchange chamber is located at the rear side of the air inlet chamber, a heat exchange device is provided in the heat exchange chamber; the water circulation pipeline is connected to the heat exchange device;

[0019] A fan chamber is located at the rear side of the heat exchange chamber and is connected to the connecting pipe, and a fan is installed in the fan chamber.

[0020] As another embodiment of the present application, an equipment pit is set on one side of the pit, a partition wall is provided between the equipment pit and the pit, the air handling equipment is arranged in the equipment pit, and the connecting pipe passes through the partition wall and extends into the pit.

[0021] As another embodiment of the present application, the water circulation refrigeration system further includes:

[0022] A water storage pit is connected to the water circulation pipeline; the water storage pit is connected to a rainwater flow channel, the rainwater flow channel extends to the bottom of the pit, and a rainwater filtering device is provided at one end of the rainwater flow channel close to the water storage pit.

[0023] As another embodiment of the present application, a power distribution cabinet is provided above the pit, and a first buffer chamber for connecting to the air treatment equipment and a second buffer chamber for connecting to the air outlet duct are provided in the power distribution cabinet, and air-permeable grilles respectively connected to the first buffer chamber and the second buffer chamber are provided on the side walls of the power distribution cabinet.

[0024] The beneficial effect of the heat dissipation structure of the underground distribution transformer provided by the present invention is that: compared with the prior art, the heat dissipation structure of the underground distribution transformer of the present invention, by arranging an air circulation system and a water circulation refrigeration system in the pit, uses the air circulation system and the water circulation refrigeration system to cool the transformer, thereby improving the cooling effect, and the temperature can be adjusted in real time by using the air circulation system and the water circulation refrigeration system to maintain the temperature in the pit at a relatively constant temperature value, which is beneficial to ensuring the cooling effect of the transformer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the heat dissipation structure of an underground distribution transformer provided in an embodiment of the present invention;

[0027] Figure 2 A structural diagram of the air cooling pipeline provided in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the cross section at AA in the middle;

[0029] Figure 4 A schematic structural diagram of a heat dissipation structure of an underground distribution transformer provided in another embodiment of the present invention.

[0030] In the figure: 100, pit; 101, power distribution cabinet; 102, rainwater flow channel; 110, transformer body; 111, temperature difference generator; 112, heat transfer fins; 200, first buffer chamber; 201, air inlet pipe; 202, air handling equipment; 2021, air filter; 2022, air drying layer; 2023, heat exchange device; 2024, fan; 203, air inlet buffer chamber; 204, air cooling pipeline; 205, air outlet buffer chamber; 206, second buffer chamber; 300, water storage pit; 301, water circulation pipeline; 302, drive pump; 303, electric refrigerator; 400, equipment pit. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be noted that when an element is referred to as "fixed on" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. It should be understood that the orientation or position relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] See also Figures 1 to 4 , the heat dissipation structure of the underground distribution transformer provided by the present invention is now described. The heat dissipation structure of the underground distribution transformer includes a transformer body 110, an air circulation system and a water circulation refrigeration system; wherein the transformer body 110 is arranged in the pit 100, and a temperature difference generator 111 is arranged on the outer wall of the transformer body 110; the air circulation system includes an air treatment device 202 connected to the outside, a plurality of air cooling pipelines 204 connected to the air treatment device 202, and an air outlet pipe connected to the air cooling pipeline 204, and the air outlet pipe is connected to the outside; the water circulation refrigeration system includes a water circulation pipeline 301, a driving pump 302 and an electric refrigerator 303 arranged on the water circulation pipeline 301 in sequence, the water circulation pipeline 301 is connected to the air treatment device 202, and is used to cool the air in the air treatment device 202; the electric refrigerator 303 is electrically connected to the temperature difference generator 111.

[0034] Compared with the prior art, the heat dissipation structure of the underground distribution transformer provided by the present invention is that a transformer body 110 is arranged in the pit 100, and an air circulation system and a water circulation refrigeration system are arranged in the pit 100. The air circulation system cools the air of the external environment through the air treatment device 202, and then exchanges heat with the transformer body 110 through the air cooling pipeline 204. The gas after heat exchange is blown out through the air outlet pipe; the water circulation pipeline 301 of the water circulation refrigeration system is driven by the pump 302 and the electric refrigerator 303. After the action of the transformer body 110, low-temperature cooling water is formed, and the low-temperature cooling water flows into the air treatment equipment 202 through the water circulation pipeline 301, and cools the air in the air treatment equipment 202, so as to cool the air in the air treatment equipment 202; a temperature difference generator 111 is also arranged on one side of the transformer body 110, and the temperature difference generator 111 generates electricity by utilizing the heat generated on the outer shell of the transformer body 110, and the electric energy is transmitted to the electric refrigerator 303, so as to drive the electric refrigerator 303 to cool the cooling water in the water circulation refrigeration system.

[0035] The heat dissipation structure of the underground distribution transformer provided by the present invention, by arranging an air circulation system and a water circulation refrigeration system in the pit 100, uses the air circulation system and the water circulation refrigeration system to cool the transformer, thereby improving the cooling effect, and the temperature adjustment by using the air circulation system and the water circulation refrigeration system can be achieved in real time, and the temperature in the pit 100 is maintained at a relatively constant temperature value, which is beneficial to ensuring the cooling effect of the transformer body 110.

[0036] In some possible embodiments, see Figure 2 and Figure 3 A plurality of horizontal heat-conducting fins 112 are longitudinally spaced apart on the two outer side walls of the transformer body 110 , and the air-cooling pipeline 204 is disposed on one side of the heat-conducting fins 112 ; the heat-conducting fins 112 are spaced apart from the thermoelectric generator 111 .

[0037] Specifically, a connection terminal is provided above the transformer body 110, a mounting bracket is provided below the transformer body 110, a temperature difference generator 111 is provided on the left side wall or the right side wall of the transformer body 110, and horizontal heat conduction fins 112 are provided on the front side wall and the rear side wall of the transformer body 110, and two adjacent heat conduction fins 112 are provided at intervals. The side wall of the transformer body 110 on which the temperature difference generator 111 is provided does not need to be provided with a heat conduction fin 112.

[0038] The air cooling pipeline 204 is distributed from left to right, the inlet end of the air cooling pipeline 204 is arranged at the left end of the transformer body 110, and the outlet end of the air cooling pipeline 204 is arranged at the right end of the transformer body 110. The air in the air cooling pipeline 204 flows from left to right, and absorbs the heat on the side wall of the transformer body 110 and the heat on the heat conducting fins 112 as well as the heat in the air in the pit 100 during the flow process. Through heat exchange, the temperature in the pit 100 and the temperature of the transformer body 110 are maintained at -25°C to 40°C.

[0039] Optionally, the length of the heat conducting fin 112 is greater than the diameter of the air cooling pipe 204. The heat conducting fins 112 are arranged at equal intervals in the longitudinal direction, and the interval between two adjacent heat conducting fins 112 is greater than the diameter of the air cooling pipe 204.

[0040] Optionally, the air cooling pipe 204 is arranged horizontally, and the air cooling pipe 204 is limited between two adjacent heat conducting fins 112. There are heat conducting fins 112 above and below the air cooling pipe 204, and the side of the air cooling pipe 204 is the transformer body 110. In the working state, the air cooling pipe 204 has heat exchange with the heat conducting fins 112 and the transformer body 110; and the side of the air cooling pipe 204 away from the heat conducting fins 112 and the transformer body 110 has heat exchange with the air in the pit 100.

[0041] Optionally, the outer side of the transformer body 110 is surrounded by a horizontal circulation channel by means of the heat-conducting fins 112, and the circulation channel is connected to the air handling device 202 and the air outlet pipe as a part of the air cooling pipeline 204. The low-temperature air exchanges heat with the side wall of the transformer body 110 and the heat-conducting fins 112 in the circulation channel, which can improve the heat transfer efficiency.

[0042] In some possible embodiments, see Figure 1 and Figure 4 The air circulation system also includes an air inlet buffer chamber 203 and an air outlet buffer chamber 205; wherein the air inlet buffer chamber 203 is located at one end of the transformer body 110 close to the air handling device 202, and the two ends of the air inlet buffer chamber 203 are respectively connected to multiple air cooling pipes 204 and connecting pipes, and the connecting pipes are connected to the air handling device 202; the air outlet buffer chamber 205 is located at one end of the transformer body 110 close to the air outlet pipe, and the two ends of the air outlet buffer chamber 205 are respectively connected to multiple air cooling pipes 204 and the air outlet pipe.

[0043] Specifically, the air inlet buffer chamber 203 and the air outlet buffer chamber 205 are respectively connected at both ends of the air cooling pipeline 204, wherein the air inlet buffer chamber 203 is located on the left side of the transformer body 110, and the air outlet buffer chamber 205 is located on the right side of the transformer body 110. The air enters the air cooling pipeline 204 from the air inlet buffer chamber 203, and enters the air outlet buffer chamber 205 after heat exchange with the transformer body 110 in the air cooling pipeline 204. The side of the air inlet buffer chamber 203 away from the air cooling pipeline 204 is connected to the air treatment device 202, that is, after the outside air enters the air treatment device 202, it is cooled in the air treatment device 202 and then enters the air inlet buffer chamber 203; the air outlet buffer chamber 205 is connected to the air outlet pipe.

[0044] Optionally, the cross-sectional shapes of the air inlet buffer chamber 203 and the air outlet buffer chamber 205 are both rectangular, and two rows of air cooling pipes 204 are arranged longitudinally spaced apart on the opposite side walls of the air inlet buffer chamber 203 and the air outlet buffer chamber 205. The two rows of pipes are located at the front and rear sides of the transformer body 110, respectively.

[0045] In some possible embodiments, see Figure 1 and Figure 4 Both the air inlet buffer chamber 203 and the air outlet buffer chamber 205 are provided with ventilation holes.

[0046] Specifically, ventilation holes are provided at the upper end of the air inlet buffer chamber 203 and the lower end of the air outlet buffer chamber 205. After the low-temperature air enters the air inlet buffer chamber 203, a part of it enters the air cooling pipe 204, and enters the air outlet buffer chamber 205 through the air cooling pipe 204, and the other part enters the pit 100 from the ventilation hole on the air inlet buffer chamber 203; the air in the air cooling pipe 204 enters the air outlet buffer chamber 205 after heat exchange with the transformer body 110, and the air in the pit 100 enters the air outlet buffer chamber 205 through the ventilation hole of the air outlet buffer chamber 205, thereby completing the renewal of the air in the pit 100.

[0047] In some possible embodiments, see Figure 4 The hot end of the thermoelectric generator 111 is connected to the side wall of the transformer body 110 , and the cold end of the thermoelectric generator 111 extends into the soil outside the pit 100 .

[0048] Specifically, the thermoelectric generator 111 generates electricity by means of the temperature difference between the hot end and the cold end. In order to improve the power generation effect of the thermoelectric generator 111, the hot end of the thermoelectric generator 111 is connected to the outer wall of the transformer body 110, and the cold end of the thermoelectric generator 111 extends from the side wall of the pit 100 and extends into the soil outside the pit 100.

[0049] The power generation of the thermoelectric generator 111 is not affected by the temperature change in the pit 100, but is affected by the soil temperature in different seasons. In different seasons, the temperature change of the soil is smaller than the temperature change of the air. Extending the cold end of the thermoelectric generator 111 into the soil can ensure the efficiency of the thermoelectric generator 111 as much as possible.

[0050] In some possible embodiments, see Figure 1 and Figure 4 The air handling device 202 includes an air inlet chamber, a heat exchange chamber and a fan chamber; wherein, an air filter 2021 and an air drying layer 2022 located at the rear side of the air filter 2021 are provided in the air inlet chamber; an air inlet pipe 201 is provided at the front end of the air inlet chamber, and the air handling device 202 is connected with the outside world by means of the air inlet pipe 201; the heat exchange chamber is located at the rear side of the air inlet chamber, and a heat exchange device 2023 is provided in the heat exchange chamber; the water circulation pipeline 301 is connected to the heat exchange device 2023; the fan chamber is located at the rear side of the heat exchange chamber and is connected to the connecting pipe, and a fan 2024 is installed in the fan chamber.

[0051] Specifically, the air handling device 202 is provided with an air inlet chamber, a heat exchange chamber and a fan chamber in sequence. The air inlet chamber is connected to the air inlet pipe 201. The air inlet pipe 201 penetrates the end cover of the pit 100 and extends into the external environment, and is used to pass the external air into the air inlet chamber. The air filter 2021 and the air drying layer 2022 provided in the air inlet chamber are used to perform preliminary treatment on the air introduced from the outside. First, the air is filtered through the air filter 2021, and then the filtered air is dried and absorbed through the drying layer to make the air dry; then, the dry air passes through the heat exchange chamber and is cooled by the low-temperature water in the water circulation pipeline 301 to obtain low-temperature dry air; finally, the low-temperature dry air is blown into the air inlet buffer chamber 203 through the fan 2024 in the fan chamber.

[0052] Optionally, the air filter 2021 is a dust removal net, and a stainless steel net can be selected.

[0053] Optionally, the air drying layer 2022 adopts an activated carbon layer.

[0054] In some possible embodiments, see Figure 1 and Figure 4 An equipment pit 400 is arranged on one side of the pit 100 , a partition wall is arranged between the equipment pit 400 and the pit 100 , an air handling device 202 is arranged in the equipment pit 400 , and a connecting pipe passes through the partition wall and extends into the pit 100 .

[0055] Specifically, in order to prevent the air handling device 202 from affecting the operation of the transformer body 110, the air handling device 202 is arranged outside the pit 100. An equipment pit 400 is arranged on one side of the pit 100, and the air handling device 202 is arranged in the equipment pit 400 to prevent it from affecting the operation of the transformer body 110. The air handling device 202 will make noise during operation, and arranging it in the underground equipment pit 400 can reduce the impact of its noise on people's production and life, and will not occupy the ground space.

[0056] Optionally, the driving pump 302 and the electric refrigerator 303 on the water circulation refrigeration system are also arranged in the equipment pit 400. The centralized arrangement of the equipment is convenient for later maintenance and repair.

[0057] In some possible embodiments, see Figure 1 and Figure 4 The water circulation refrigeration system also includes a water storage pit 300, which is connected to the water circulation pipeline 301; the water storage pit 300 is connected to a rainwater flow channel 102, which extends to the bottom of the pit 100, and a rainwater filtering device is provided at one end of the rainwater flow channel 102 close to the water storage pit 300.

[0058] Specifically, a water-conducting gravel layer is provided on the ground at the lower end of the pit 100 to facilitate water infiltration, and the transformer body 110 is provided above the water-conducting gravel layer. In extreme weather such as rain, water will accumulate in the pit 100, and the water-conducting gravel layer facilitates drainage of the pit 100. A rainwater flow channel 102 is provided below the water-conducting gravel layer, and the accumulated water infiltrates into the rainwater flow channel 102 through the water-conducting gravel layer, and then flows along the rainwater flow channel 102 to the water storage pit 300, wherein a rainwater filtering device is provided at the connection between the rainwater flow channel 102 and the water storage pit 300.

[0059] The rainwater entering the water storage pit 300 can be used as water for the water circulation pipeline 301. The water in the water storage pit 300 enters the heat exchange device to cool the air after driving the water pump and the electric refrigerator 303. Using the rainwater as circulating water after treatment can save water resources.

[0060] Optionally, a sterilization and disinfection device is provided in the water storage pit 300 to ensure that the water quality in the water storage pit 300 meets the standards.

[0061] Optionally, the side walls of the water storage pit 300 are made of rust-proof steel plates.

[0062] Optionally, a water supply pipe is provided on the water storage pit 300.

[0063] In some possible embodiments, see Figure 1 and Figure 4A power distribution cabinet 101 is provided above the pit 100. A first buffer chamber 200 for connecting to an air handling device 202 and a second buffer chamber 206 for connecting to an air outlet duct are provided in the power distribution cabinet 101. A ventilation grille which is respectively connected to the first buffer chamber 200 and the second buffer chamber 206 is provided on the side wall of the power distribution cabinet 101.

[0064] Specifically, the power distribution cabinet 101 is arranged above the pit 100, and the power distribution cabinet 101 is arranged on the ground. A first buffer chamber 200 and a second buffer chamber 206 are respectively arranged on both sides of the power distribution cabinet 101, and the first buffer chamber 200 and the second buffer chamber 206 are both connected to the outside through the air-permeable grille on the side wall of the power distribution cabinet 101; the first buffer chamber 200 is connected to the air inlet pipe 201, and the second buffer chamber 206 is connected to the air outlet pipe, so as to keep the wind speed stable.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The heat dissipation structure of the underground distribution transformer is characterized by: include: A transformer body, wherein the transformer body is arranged in a pit, and a temperature difference generator is arranged on an outer wall of the transformer body; An air circulation system, the air circulation system comprising an air treatment device connected to the outside, a plurality of air cooling pipelines connected to the air treatment device, and an air outlet pipe connected to the air cooling pipeline, the air outlet pipe being connected to the outside; A water circulation refrigeration system, the water circulation refrigeration system comprising a water circulation pipeline, a driving pump and an electric refrigerator sequentially arranged on the water circulation pipeline, the water circulation pipeline is connected to the air treatment equipment and is used to cool the air in the air treatment equipment; the electric refrigerator is electrically connected to the thermoelectric generator; A plurality of heat-conducting fins in a horizontal direction are longitudinally spaced apart on two outer side walls of the transformer body, and the air-cooling pipeline is arranged on one side of the heat-conducting fins; the heat-conducting fins and the thermoelectric generator are spaced apart; The outer side of the transformer body is surrounded by heat-conducting fins to form a horizontal flow channel, which, as a part of the air-cooling pipeline, is connected with the air handling device and the air outlet pipe.

2. The heat dissipation structure of the underground distribution transformer according to claim 1, characterized in that: The air circulation system also includes: An air inlet buffer chamber, the air inlet buffer chamber is located at one end of the transformer body close to the air handling device, and both ends of the air inlet buffer chamber are respectively connected to a plurality of the air cooling pipelines and connecting pipes, and the connecting pipes are connected to the air handling device; An air outlet buffer chamber is located at one end of the transformer body close to the air outlet pipe, and two ends of the air outlet buffer chamber are respectively connected to a plurality of the air cooling pipelines and the air outlet pipe.

3. The heat dissipation structure of the underground distribution transformer according to claim 2, characterized in that: The air inlet buffer cavity and the air outlet buffer cavity are both provided with ventilation holes.

4. The heat dissipation structure of the underground distribution transformer according to claim 3, characterized in that: The hot end of the thermoelectric generator is connected to the side wall of the transformer body, and the cold end of the thermoelectric generator extends into the soil outside the pit.

5. The heat dissipation structure of the underground distribution transformer according to claim 2, characterized in that: The air handling equipment comprises: An air inlet cavity, wherein an air filter and an air drying layer located at the rear side of the air filter are arranged in the air inlet cavity; an air inlet pipe is arranged at the front end of the air inlet cavity, and the air treatment device is connected to the outside world by means of the air inlet pipe; A heat exchange chamber, the heat exchange chamber is located at the rear side of the air inlet chamber, a heat exchange device is provided in the heat exchange chamber; the water circulation pipeline is connected to the heat exchange device; A fan chamber is located at the rear side of the heat exchange chamber and is connected to the connecting pipe, and a fan is installed in the fan chamber.

6. The heat dissipation structure of the underground distribution transformer according to claim 2, characterized in that: An equipment pit is arranged on one side of the pit, a partition wall is arranged between the equipment pit and the pit, the air handling equipment is arranged in the equipment pit, and the connecting pipe passes through the partition wall and extends into the pit.

7. The heat dissipation structure of the underground distribution transformer according to claim 1, characterized in that: The water circulation refrigeration system also includes: A water storage pit is connected to the water circulation pipeline; the water storage pit is connected to a rainwater flow channel, the rainwater flow channel extends to the bottom of the pit, and a rainwater filtering device is provided at one end of the rainwater flow channel close to the water storage pit.

8. The heat dissipation structure of the underground distribution transformer according to claim 1, characterized in that: A power distribution cabinet is provided above the pit, and a first buffer chamber for connecting to the air handling equipment and a second buffer chamber for connecting to the air outlet duct are provided in the power distribution cabinet. A ventilation grille respectively connected to the first buffer chamber and the second buffer chamber is provided on the side wall of the power distribution cabinet.

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