Box-type substation and energy storage, conversion and boosting all-in-one machine

Abstract

The utility model discloses a box-type substation and an energy storage, conversion and boosting all-in-one machine, which can optimize an air duct in a transformer body, so that heat in the transformer body can be better taken away, and the heat dissipation effect of the transformer body is improved. The box-type substation comprises a shell and a transformer body. A transformer chamber is arranged in the shell; an air inlet is formed in the bottom of the transformer chamber, an air outlet is formed in the top of the transformer chamber, and external air enters the transformer chamber from the air inlet and is exhausted from the air outlet. The transformer body is arranged in the transformer chamber and comprises an iron core, a primary winding, a secondary winding and an isolation insulating cylinder; the secondary winding and the primary winding are sequentially wound on the iron core from inside to outside, and a first gap is formed between the primary winding and the secondary winding; the isolation insulating cylinder is arranged in the first gap, so that a first air supply channel is formed between the primary winding and the isolation insulating cylinder, and a second air supply channel is formed between the secondary winding and the isolation insulating cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically relating to a box-type substation and an integrated energy storage, converter, and step-up transformer. Background Technology

[0002] With the rapid development of renewable energy, energy storage systems are being used more and more widely in power systems. Energy storage systems require efficient and reliable transformers to convert and transmit electrical energy. Traditional oil-immersed transformers have problems such as flammability, explosiveness, and complex maintenance, while dry-type transformers, due to their advantages of being environmentally friendly, safe, and easy to maintain, are gradually becoming the preferred choice for energy storage systems.

[0003] With the development of energy storage systems, the scale of energy storage system construction is also gradually increasing. At present, the scale of energy storage systems is basically above 100 megawatts.

[0004] The operating conditions of energy storage transformers in energy storage systems differ from those of conventional distribution transformers. Energy storage transformers typically need to operate at full power for 2-4 hours, and their operating conditions are much harsher than those of distribution transformers. During the operation of energy storage systems, the following problems were found with the energy storage transformers: the air inside the transformer chamber in existing energy storage systems is insufficient for effective heat dissipation from the transformer body, resulting in high temperature rise of the dry-type transformers in existing energy storage systems, which in turn affects the overall performance and reliability of the energy storage system.

[0005] In the prior art, in order to improve the heat dissipation effect of dry-type transformers in the transformer room, the air volume entering the transformer room is usually increased to better dissipate heat from the transformer body. However, the above method is difficult to remove the heat inside the transformer body, so the heat dissipation effect on the transformer body is limited. Utility Model Content

[0006] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the existing technology by providing a box-type substation and an integrated energy storage converter and step-up unit, which can optimize the air duct inside the transformer body, thereby better removing the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0007] In a first aspect, this utility model provides a prefabricated substation, which includes a housing and a transformer body. A transformer compartment is located inside the housing; an air inlet is located at the bottom of the transformer compartment, and an exhaust outlet is located at the top of the transformer compartment. External air enters the transformer compartment through the air inlet and exits through the exhaust outlet. The transformer body is located within the transformer compartment and includes an iron core, a primary winding, a secondary winding, and an insulating cylinder. The secondary winding and the primary winding are wound sequentially on the iron core from the inside out, with a first gap between the primary winding and the secondary winding. The insulating cylinder is disposed within the first gap to form a first air supply channel between the primary winding and the insulating cylinder, and a second air supply channel between the secondary winding and the insulating cylinder. After entering the transformer compartment through the air inlet, external air flows through the first air supply channel to dissipate heat from the inner surface of the primary winding and flows through the second air supply channel to dissipate heat from the outer surface of the secondary winding.

[0008] In some embodiments, the first air supply channel and the second air supply channel have the same width.

[0009] In some embodiments, the transformer body further includes a wind-guiding insulating cylinder. The wind-guiding insulating cylinder is sleeved on the outside of the primary winding, and a third air supply channel is formed between the wind-guiding insulating cylinder and the primary winding. After external air enters the transformer room through the air inlet, it also flows through the third air supply channel to dissipate heat from the outer surface of the primary winding.

[0010] In some embodiments, the width of the third air supply channel is a, where 20mm ≤ a ≤ 25mm.

[0011] In some embodiments, a cooling fan is provided below the transformer body, the cooling fan being used to draw in outside air from the air inlet and blow it towards the bottom of the transformer body. A wind baffle is provided at the bottom of the transformer chamber, the wind baffle being horizontally positioned and surrounding the outside of the air-guiding insulating cylinder of the transformer body. The inner ring of the wind baffle is closedly connected to the air-guiding insulating cylinder, and the outer ring of the wind baffle is closedly connected to the inner wall of the transformer chamber, thereby forming a wind pressure zone between the wind baffle and the bottom wall of the transformer chamber.

[0012] In some embodiments, the housing further includes a low-voltage switch compartment and a high-voltage switch compartment. The low-voltage switch compartment and the high-voltage switch compartment are adjacent to each other and are both located on the same side of the transformer compartment. The transformer compartment, the low-voltage switch compartment, and the high-voltage switch compartment are arranged in a triangular structure in the horizontal plane.

[0013] In some embodiments, an exhaust fan is provided at the exhaust vent to draw air from the transformer room to the outside.

[0014] In some embodiments, a second gap is provided between the core and the secondary winding to form a fourth air supply channel between the core and the secondary winding.

[0015] Therefore, the prefabricated substation provided in this embodiment of the utility model, by setting a transformer chamber inside the casing, with an air inlet at the bottom and an exhaust vent at the top, allows external air to enter the transformer chamber through the air inlet and exit through the exhaust vent, achieving air circulation within the transformer chamber. This allows cold external air to enter the transformer chamber to dissipate heat from the transformer body before flowing out through the exhaust vent, thus carrying away heat from the transformer chamber. By setting an insulating cylinder in the first gap between the primary and secondary windings, the insulation effect between the primary and secondary windings can be improved, forming a first air supply channel between the primary winding and the insulating cylinder, and a second air supply channel between the secondary winding and the insulating cylinder. This optimizes the airflow inside the transformer body, allowing external air to enter the transformer chamber through the air inlet, flow through the first air supply channel to dissipate heat from the inner surface of the primary winding, and flow through the second air supply channel to dissipate heat from the outer surface of the secondary winding, thereby better carrying away heat from the inside of the transformer body and improving the heat dissipation effect of the transformer body.

[0016] Secondly, this utility model embodiment also provides an integrated energy storage converter and booster unit, which includes a base plate, a prefabricated substation as described in the first aspect, and an energy storage converter. Both the prefabricated substation and the energy storage converter are mounted on the base plate. The prefabricated substation is electrically connected to an external energy storage device via the energy storage converter, and works in conjunction with the energy storage converter to convert electrical energy flowing into or out of the energy storage device.

[0017] In some embodiments, a third gap exists between the energy storage converter and the transformer compartment of the prefabricated substation.

[0018] The energy storage converter and booster integrated unit provided in this embodiment of the utility model has the same beneficial effects as the above-mentioned box-type substation, which will not be repeated here. Attached Figure Description

[0019] Figure 1 : A schematic diagram of a prefabricated substation provided in an embodiment of this utility model;

[0020] Figure 2 : A top view of the internal structure of a prefabricated substation provided in an embodiment of this utility model;

[0021] Figure 3 : A structural diagram of a transformer body provided for an embodiment of this utility model;

[0022] Figure 4 : A longitudinal sectional view of a transformer body provided for an embodiment of this utility model;

[0023] Figure 5 : A simulation diagram of the temperature distribution of a transformer body provided for an embodiment of this utility model;

[0024] Figure 6 : An internal structural diagram of a prefabricated substation provided in an embodiment of this utility model;

[0025] Figure 7 This is an internal structural diagram of a prefabricated substation provided in the prior art;

[0026] Figure 8 This is a simulation diagram of the temperature distribution of a transformer body in the prior art.

[0027] Figure 9 This is a diagram of an indoor airflow model for a transformer, provided as an embodiment of the present invention.

[0028] Among them, 1-primary winding; 2-secondary winding; 3-iron core; 4-isolation insulation cylinder; 5-air guide insulation cylinder; 6-wind baffle; 7-cooling fan; 8-shell; 9-energy storage converter; 10-low voltage switch room; 11-high voltage switch room; 12-transformer room; 13-grid; 14-induced draft fan. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] Example 1:

[0031] like Figure 1 As shown in the figure, this utility model embodiment provides a prefabricated substation, which is applied in the power field and is used to transform the input electrical energy before outputting it.

[0032] Combination Figure 1 and Figure 2 The prefabricated substation includes a casing 8 and a transformer body. A transformer compartment 12 is located inside the casing 8. An air inlet is located at the bottom of the transformer compartment 12, and an exhaust vent is located at the top of the transformer compartment 12. Outside air enters the transformer compartment 12 through the air inlet and exits through the exhaust vent.

[0033] For example, such as Figure 1As shown, the housing 8 is a box-shaped structure made of sheet metal and frame to protect its internal structure (such as the transformer body).

[0034] Transformer compartment 12 is used to house the transformer body.

[0035] For example, there can be multiple air inlets and multiple air outlets, which can be distributed on different sides of the transformer room 12.

[0036] For example, such as Figure 1 As shown, a grille 13 is installed at the air inlet of the transformer room 12 to filter the air entering the transformer room 12 and prevent foreign objects from entering the transformer room 12 through the air inlet.

[0037] For example, such as Figure 1 As shown, an exhaust fan 14 is installed at the exhaust vent of the transformer room 12. The exhaust fan 14 is used to draw the air in the transformer room 12 to the outside.

[0038] For example, there are multiple induced draft fans 14 to increase the air circulation speed inside the transformer room 12.

[0039] The above settings enable air circulation within the transformer chamber 12, allowing external cold air to enter the transformer chamber 12 to dissipate heat from the transformer body and then flow out through the exhaust vents of the transformer chamber 12 in a timely manner, thereby carrying away the heat within the transformer chamber 12.

[0040] like Figure 2 and Figure 3 As shown, the transformer body is located inside the transformer chamber 12. The transformer body includes an iron core 3, a primary winding 1, a secondary winding 2, and an insulating cylinder 4. The secondary winding 2 and the primary winding 1 are wound sequentially on the iron core 3 from the inside out, with a first gap between the primary winding 1 and the secondary winding 2. The insulating cylinder 4 is disposed in the first gap to form a first air supply channel between the primary winding 1 and the insulating cylinder 4, and a second air supply channel between the secondary winding 2 and the insulating cylinder 4. After entering the transformer chamber 12 through the air inlet, external air flows through the first air supply channel to dissipate heat on the inner surface of the primary winding 1, and flows through the second air supply channel to dissipate heat on the outer surface of the secondary winding 2.

[0041] Understandably, the transformer body described above refers to the body of a dry-type transformer, such as a 35kV energy storage dry-type transformer. The transformer body is in direct contact with the air inside the transformer chamber, and the heat on the transformer body is carried away by the airflow inside the transformer chamber.

[0042] The core 3, primary winding 1, and secondary winding 2 are all existing structures.

[0043] The first gap provides an insulation gap between the primary winding 1 and the secondary winding 2.

[0044] For example, the insulating cylinder 4 is fixed to the yoke of the iron core 3 to maintain its position. The insulating cylinder 4 is made of H-class insulation material, and its thickness needs to be set according to the width of the first gap and the insulation requirements between the primary winding 1 and the secondary winding 2. The thicker the insulating cylinder 4, the better the insulation effect it can provide.

[0045] For example, the width of the first air supply channel can be between 10mm and 15mm, the width of the second air supply channel can be between 10mm and 15mm, and the thickness of the insulating cylinder 4 can be between 1mm and 3mm.

[0046] Combination Figure 3 and Figure 4 After setting the isolation insulation cylinder 4, in addition to increasing the insulation effect between the primary winding 1 and the secondary winding 2, a first air supply channel and a second air supply channel can also be formed in the first gap between the primary winding 1 and the secondary winding 2. This optimizes the air duct inside the transformer body, so that when the air entering the transformer chamber 12 flows through the first air supply channel and the second air supply channel, it dissipates heat on the inner surface of the primary winding 1 and the outer surface of the secondary winding 2, respectively, thereby better removing the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0047] Therefore, the box-type substation provided in this utility model embodiment, by setting a transformer chamber inside the shell 8, and setting an air inlet at the bottom of the transformer chamber 12 and an exhaust vent at the top of the transformer chamber 12, allows external air to enter the transformer chamber 12 through the air inlet and exit through the exhaust vent, thus realizing the air circulation inside the transformer chamber 12. This allows external cold air to enter the transformer chamber 12 to dissipate heat from the transformer body and then flow out through the exhaust vent of the transformer chamber 12, thereby carrying away the heat inside the transformer chamber 12. By setting an insulating cylinder 4 in the first gap between the primary winding 1 and the secondary winding 2, the insulation effect between the primary winding 1 and the secondary winding 2 can be improved, and a first air supply channel is formed between the primary winding 1 and the insulating cylinder 4, and a second air supply channel is formed between the secondary winding 2 and the insulating cylinder 4. This optimizes the airflow inside the transformer body, allowing external air to enter the transformer chamber 12 through the air inlet, flow through the first air supply channel to dissipate heat on the inner surface of the primary winding 1, and flow through the second air supply channel to dissipate heat on the outer surface of the secondary winding 2. This better removes heat from inside the transformer body and improves the heat dissipation effect of the transformer body.

[0048] See Figure 5 , Figure 5To simulate the temperature distribution inside transformer room 12 after the installation of isolation insulation cylinder 4, from... Figure 5 It can be seen that after the airflow passes through the inside of the transformer body, it can effectively remove the heat inside the transformer body. Therefore, through... Figure 5 The simulation diagrams can verify the beneficial effects of the aforementioned prefabricated substation.

[0049] In some embodiments, such as Figure 4 As shown, the widths of the first and second air supply channels are the same.

[0050] That is, the insulating cylinder 4 is positioned at the center of the first gap, so that the airflow through the first air supply channel and the second air supply channel is approximately the same, thereby providing approximately the same heat dissipation effect to the inner surface of the primary winding 1 and the outer surface of the secondary winding 2, and avoiding the fact that the width of one of the first air supply channel and the second air supply channel is too low, which would affect the heat dissipation effect on the winding on the corresponding side.

[0051] The heat dissipation principle of a dry-type transformer body is as follows:

[0052] When a dry-type transformer is in operation, the no-load loss in the core and the load loss in the windings (including primary winding 1 and secondary winding 2, the same below) are converted into heat, causing the temperature of the core and windings to rise. In order to limit the temperature of the core and windings within the allowable values ​​specified in relevant standards and user technical agreements, the heat generated by the transformer body must be continuously and timely discharged from the casing so that the heat generated equals the heat dissipation to form a thermal balance.

[0053] Heat transfer is achieved through conduction, convection, and radiation. Heat inside the core and windings reaches the surface via thermal conduction, and then dissipates from the surface through the cooling medium (air). Heat dissipation from the core and winding surfaces primarily relies on convection and radiation. Once the dry-type transformer reaches thermal equilibrium, convection and radiation become the main heat transfer mechanisms, and their effects are considered independent, being the sum of their individual effects. For exposed heat dissipation surfaces (such as the outer surface of primary winding 1), the cooling medium (air) is in direct contact with the surface, exhibiting both convection and radiation effects. For internal heat dissipation surfaces (such as the inner surface of primary winding 1), only convection occurs, with radiation being negligible.

[0054] Under convective heat dissipation, the maximum temperature difference occurs in the stationary layer of cooling medium (air) that is in close contact with the surface of the heat-generating element. During natural convection, the air flow speed is about tens of centimeters per second. By accelerating the air flow speed, the thickness of the stationary air layer on the surface of the heat-generating element (primary winding 1 and secondary winding 2) of the transformer can be reduced. The temperature difference between the heat-generating element and the surrounding air will decrease rapidly, thereby reducing the temperature difference between the heat-generating element and the air and improving the heat dissipation effect on the heat-generating element.

[0055] Based on the above principles, in some embodiments, the transformer body further includes a wind-guiding insulating cylinder 5. The wind-guiding insulating cylinder 5 is sleeved on the outside of the primary winding 1, forming a third air supply channel between the wind-guiding insulating cylinder 5 and the primary winding 1. After external air enters the transformer chamber 12 through the air inlet, it also flows through the third air supply channel to dissipate heat from the outer surface of the primary winding 1.

[0056] The air guide insulating cylinder 5 is located outside the primary winding 1, so the insulation requirements for the air guide insulating cylinder 5 are relatively low.

[0057] For example, the material of the air-guiding insulating cylinder 5 can be, for instance, a Class B insulating material.

[0058] With the above settings, a chimney effect can be formed in the third air supply channel, increasing the air velocity in the third air supply channel, thereby allowing more air to flow through the third air supply channel to dissipate heat on the outer surface of the primary winding 1, thus improving the heat dissipation effect on the outer surface of the primary winding 1.

[0059] Furthermore, such as Figure 2 and Figure 3 As shown, to ensure insulation between the primary winding 1 and the inner wall of the transformer compartment 12, the insulation distance L between them needs to be maintained. Without the air-guided insulating cylinder 5, air is used as the insulating medium. It is understood that the insulating capacity of the air-guided insulating cylinder 5 is greater than that of air. Therefore, by installing the air-guided insulating cylinder 5, while ensuring insulation between the primary winding 1 and the inner wall of the transformer compartment 12, the insulation distance L between them can be reduced, thereby reducing the overall size of the transformer compartment 12 and thus lowering the manufacturing cost of the prefabricated substation.

[0060] It should be noted that when air flows through the third air supply duct, friction between the inner wall of the duct and the air creates air resistance. This air resistance affects the airflow velocity in the third air supply duct, thus impacting its heat dissipation effect. Figure 4 The width of the third air supply channel is 'a'. The inventor discovered that when the width 'a' of the third air supply channel decreases, the air resistance generated by the friction between the air duct wall and the air increases, and the airflow velocity decreases. Conversely, when the width 'a' of the third air supply channel increases, the air resistance generated by the friction between the air duct wall and the air decreases, but the chimney effect generated by the third air supply channel decreases, and uneven airflow distribution within the third air supply channel can occur, affecting the final heat dissipation. Therefore, to ensure a better heat dissipation effect of the third air supply channel, the width 'a' of the third air supply channel needs to be precisely set.

[0061] In some embodiments, such as Figure 4 As shown, the width of the third air supply channel is a, where 20mm ≤ a ≤ 25mm.

[0062] For example, the width 'a' of the third air supply duct can be 20mm, 23mm, 25mm, etc.

[0063] By setting the width 'a' of the third air supply channel within the aforementioned range, it is possible to ensure that the airflow velocity and air resistance generated when the air flows through the third air supply channel are within an optimal range, and to ensure that the airflow distribution within the third air supply channel is uniform, so that the air can better dissipate heat from the outer surface of the primary winding 1 when it flows through the third air supply channel.

[0064] In some embodiments, such as Figure 6 As shown, a cooling fan 7 is installed below the transformer body. The cooling fan 7 is used to draw in external air from the air inlet and blow it towards the bottom of the transformer body.

[0065] For example, the cooling fan 7 is a centrifugal fan with an air volume of 2000 m³ / h. The air intake of the cooling fan 7 is oriented towards the air inlet, and the air outlet of the cooling fan 7 is oriented towards the bottom of the transformer body.

[0066] For example, the number of cooling fans 7 can be one or more, such as six, with two cooling fans 7 provided on both sides of each phase winding of the transformer body.

[0067] This increases the air pressure and initial velocity of the air entering the first, second, and third air supply channels, thereby increasing the airflow speed through these channels and improving the heat dissipation effect on the transformer body.

[0068] like Figure 7 and Figure 8 As shown, the transformer room 12 in the prior art only contains the transformer body and the cooling fan 7. Figure 8 This is a simulation diagram of the airflow and temperature distribution within transformer chamber 12 in the existing technology. Figure 8 In the diagram, the lines with arrows indicate the direction of airflow. Figure 8 It is known that the airflow in the transformer room in the existing technology is relatively turbulent. Some of the air entering from the air inlets on both sides of the transformer room 12 is directly discharged without flowing over the transformer body to carry away heat. The air utilization rate is low, which also leads to poor heat dissipation effect of the air on the transformer body.

[0069] Based on this, in some embodiments of the present invention, such as Figure 4 and Figure 6As shown, a wind baffle 6 is provided at the bottom of the transformer chamber 12. The wind baffle 6 is horizontally arranged and surrounds the outside of the air-guiding insulation cylinder 5 of the transformer body. The inner ring of the wind baffle 6 is closedly connected to the air-guiding insulation cylinder 5, and the outer ring of the wind baffle 6 is closedly connected to the inner wall of the transformer chamber 12, so as to form a wind pressure zone between the wind baffle 6 and the bottom wall of the transformer chamber 12.

[0070] For example, the material of the wind baffle 6 can be Class B insulation material. A sealing material is provided between the wind baffle 6 and the air guide insulation cylinder 5.

[0071] like Figure 4 As shown, the wind deflector 6 is roughly flush with the bottom surfaces of the primary winding 1 and the secondary winding 2.

[0072] For example, the wind baffle 6 is fixed to the inner wall of the transformer room by a connector.

[0073] Understandably, under the action of cooling fan 7, a large amount of air is drawn into the air pressure zone, which makes the air pressure in the air pressure zone greater than the outside air pressure, thereby helping to increase the speed of air flowing through the first air supply channel, the second air supply channel and the third air supply channel, and improve the heat dissipation effect on the transformer body.

[0074] See Figure 9 , Figure 9 This is a model diagram of the airflow inside the transformer room 12 after the installation of the wind baffle 6. Figure 9 The blue arrows in the diagram indicate the path of air entering transformer room 12. Figure 9 For the air flowing out of transformer chamber 12. (By...) Figure 9 It can be seen that after the baffle plate 6 is installed, the airflow can enter the transformer chamber 12 in an orderly manner and the airflow path of the transformer chamber 12 can be improved, thereby avoiding the air being directly discharged without carrying away heat through the transformer body, thus improving the utilization rate of the air entering the transformer chamber 12.

[0075] Therefore, through the above settings, the airflow entering the transformer chamber 12 can be made more orderly, reducing the amount of air that flows out directly without cooling the transformer body, thereby improving the utilization rate of the air entering the transformer chamber 12. Under the same airflow into the transformer chamber 12, the heat dissipation effect on the transformer body can be improved.

[0076] In some embodiments, combined with Figure 1 and Figure 2 The housing 8 also houses a low-voltage switch chamber 10 and a high-voltage switch chamber 11. The low-voltage switch chamber 10 and the high-voltage switch chamber 11 are adjacent to each other and are both located on the same side of the transformer chamber 12. The transformer chamber 12, the low-voltage switch chamber 10, and the high-voltage switch chamber 11 are arranged in a triangular structure in the horizontal plane.

[0077] For example, the low-voltage switch compartment 10 is used to install low-voltage power distribution equipment. The high-voltage switch compartment 11 is used to install high-voltage power distribution equipment. The structures of the low-voltage and high-voltage power distribution equipment, as well as their connection methods to the transformer body, are prior art in this field and will not be described in detail here.

[0078] For example, such as Figure 2 As shown, both the low-voltage switch compartment 10 and the high-voltage switch compartment 11 are located to the left of the transformer compartment 12, and the low-voltage switch compartment 10 and the high-voltage switch compartment 11 are arranged back to back.

[0079] For example, the low-voltage switch room 10, the high-voltage switch room 11, and the transformer room 12 are all separated by partitions (e.g., wall panels), so that the low-voltage switch room 10, the high-voltage switch room 11, and the transformer room 12 form their own independent spaces, ensuring that the equipment in the low-voltage switch room 10, the high-voltage switch room 11, and the transformer room 12 do not affect each other and operate safely and reliably.

[0080] The above-mentioned setup can prevent the equipment in the low-voltage switch room 10, high-voltage switch room 11, and transformer room 12 from interfering with each other, and makes the structure of the prefabricated substation compact. The design and manufacturing process of the prefabricated substation is greatly reduced, thereby improving the production efficiency of the prefabricated substation and reducing the overall manufacturing difficulty and cost of the product. On the other hand, the above-mentioned setup also makes it easier to install switch doors on the low-voltage switch room 10, high-voltage switch room 11, and transformer room 12.

[0081] In some embodiments, such as Figure 3 and Figure 4 As shown, there is a second gap between the iron core 3 and the secondary winding 2 to form a fourth air supply channel between the iron core 3 and the secondary winding 2.

[0082] Understandably, air can flow through the fourth air supply channel to dissipate heat from the outer side of the iron core 3 and the inner side of the secondary winding 2, further improving the heat dissipation effect of the transformer body.

[0083] The inventors have verified that, after comprehensively using the above-mentioned improvement measures, the prefabricated substation provided in this utility model embodiment can improve heat dissipation efficiency by more than 40% compared with the prefabricated substation in the prior art.

[0084] In summary, after improving the heat dissipation effect on the transformer body, the prefabricated substation provided by this utility model embodiment has the characteristics of strong thermal shock resistance, large overload capacity and strong emergency overload capacity, convenient repair and maintenance, and safe and reliable performance.

[0085] Example 2:

[0086] The embodiment of the utility model further provides an energy storage converter and booster integrated machine, which is used in an energy storage system to convert and control the electric energy between the power grid and an energy storage device (such as an energy storage battery).

[0087] As Figure 1 and Figure 2 shown, the energy storage converter and booster integrated machine includes a bottom plate, the box-type substation in Embodiment 1, and an energy storage converter 9. The box-type substation and the energy storage converter 9 are both arranged on the bottom plate. The box-type substation is electrically connected to an external energy storage device through the energy storage converter, and is used to cooperate with the energy storage converter 9 to realize the conversion of the electric energy flowing into or out of the energy storage device.

[0088] Exemplarily, the bottom plate can be formed by welding a steel frame and a steel plate to improve the strength of the bottom plate. The housing 8 of the box-type substation is buckled on the bottom plate, and the transformer body in the box-type substation is fixed on the bottom plate.

[0089] Exemplarily, the energy storage converter 9 is electrically connected to an energy storage device (energy storage battery), and the energy storage converter 9 is also electrically connected to an external power grid through the box-type substation.

[0090] Exemplarily, as Figure 1 and Figure 2 shown, the low-voltage switch room 10, together with the high-voltage switch room 11, the box-type substation, and the energy storage converter 9, is arranged in a structure of a Chinese character "mu".

[0091] Through the above settings, it is convenient to lift the entire energy storage converter and booster integrated machine through the bottom plate, and the overall compactness of the energy storage converter and booster integrated machine is also improved. The design and manufacturing process difficulty is greatly reduced, the production efficiency of the energy storage converter and booster integrated machine is improved, and the overall manufacturing difficulty and cost of the energy storage converter and booster integrated machine are reduced. And because the box-type substation has a good heat dissipation effect, its short-circuit resistance ability is strong, which can improve the operation stability and reliability of the energy storage converter and booster integrated machine.

[0092] In some embodiments, as Figure 1 and Figure 2 shown, there is a third gap between the energy storage converter 9 and the transformer room 12 of the box-type substation.

[0093] The size of the third gap can be set according to the heat generation amount of the energy storage converter 9 and the heat generation amount of the transformer body in the transformer room 12.

[0094] In practical use, the energy storage converter 9 generates a large amount of heat, and the transformer body in the transformer room 12 also generates a large amount of heat. By setting a third gap between the energy storage converter 9 and the transformer room 12 of the box-type substation, it is equivalent to isolating the energy storage converter 9 and the transformer room 12 from dual heat sources. At the same time, it facilitates the independent heat dissipation of the energy storage converter 9 and the transformer room 12. Therefore, the energy storage converter and step-up integrated machine provided in this embodiment of the utility model does not need to introduce additional refrigeration equipment. It can achieve stable heat dissipation through its own air supply and exhaust technology, which is conducive to reducing total energy consumption and carbon emissions.

[0095] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A box-type substation, characterized by, The shell (8) is internally provided with a transformer chamber (12); the bottom of the transformer chamber (12) is provided with an air inlet, the top of the transformer chamber (12) is provided with an air outlet, external air enters the inside of the transformer chamber (12) from the air inlet and is discharged from the air outlet; and, The transformer body is arranged in the transformer chamber (12), and the transformer body comprises a core (3), a primary winding (1), a secondary winding (2) and an isolation insulation cylinder (4); the secondary winding (2) and the primary winding (1) are wound on the core (3) in turn from inside to outside, and the primary winding (1) and the secondary winding (2) have a first gap; the isolation insulation cylinder (4) is arranged in the first gap to form a first air supply channel between the primary winding (1) and the isolation insulation cylinder (4) and a second air supply channel between the secondary winding (2) and the isolation insulation cylinder (4); After the external air enters the inside of the transformer chamber (12) from the air inlet, it flows through the first air supply channel to dissipate heat from the inner surface of the primary winding (1) and flows through the second air supply channel to dissipate heat from the outer surface of the secondary winding (2). The widths of the first air supply channel and the second air supply channel are the same.

2. The box-type substation according to claim 1, characterized in that, The transformer body further comprises a wind-guiding insulation cylinder (5); 3. The box-type substation according to claim 1, characterized in that, The wind-guiding insulation cylinder (5) is sleeved on the outside of the primary winding (1), and a third air supply channel is formed between the wind-guiding insulation cylinder (5) and the primary winding (1); After the external air enters the inside of the transformer chamber (12) from the air inlet, it also flows through the third air supply channel to dissipate heat from the outer surface of the primary winding (1). The width of the third air supply channel is a, and 20mm≤a≤25mm.

4. The box-type substation according to claim 3, characterized in that, A cooling fan (7) is arranged below the transformer body, and the cooling fan (7) is used to blow external air from the air inlet to the bottom of the transformer body; 5. The box-type substation according to claim 3, characterized in that, A wind baffle (6) is arranged in the bottom of the transformer chamber (12), the wind baffle (6) is horizontally arranged and is arranged outside the wind-guiding insulation cylinder (5) of the transformer body, the inner ring of the wind baffle (6) is in closed connection with the wind-guiding insulation cylinder (5), and the outer ring of the wind baffle (6) is in closed connection with the inner side wall of the transformer chamber (12), so as to form an air pressure area between the wind baffle (6) and the bottom wall of the transformer chamber (12). The inside of the shell (8) is further provided with a low-voltage switch chamber (10) and a high-voltage switch chamber (11); 6. The box-type substation of claim 1, wherein The low-voltage switch chamber (10) and the high-voltage switch chamber (11) are adjacent and are both arranged on the same side of the transformer chamber (12), and the transformer chamber (12), the low-voltage switch chamber (10) and the high-voltage switch chamber (11) are arranged in a triangular shape in a horizontal plane. An air guide fan (14) is arranged at the air outlet, which is used to guide the air in the transformer chamber (12) to the outside.

7. The box-type substation of claim 1, wherein ​ 8. The box-type substation of claim 1, wherein The iron core (3) and the secondary winding (2) have a second gap to form a fourth air supply channel between the iron core (3) and the secondary winding (2).

9. A storage energy conversion and voltage boosting integrated machine, characterized in that, The box-type substation and the energy storage converter (9) are arranged on the bottom plate, and the box-type substation is electrically connected with an external energy storage device through the energy storage converter, and is used in cooperation with the energy storage converter (9) to realize conversion of electric energy flowing into or out of the energy storage device. The energy storage converter (9) and the transformer room (12) of the box-type substation have a third gap.

10. The energy storage converter boost integrated machine of claim 9, wherein, ​

Images