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

Abstract

The invention 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] The present invention belongs to the technical field of transformers, and particularly relates to a box-type substation and an energy storage converter and booster integrated machine. Background Art

[0002] With the rapid development of renewable energy, energy storage systems are increasingly widely used in power systems. Energy storage systems require efficient and reliable transformers to achieve the conversion and transmission of electrical energy. Traditional oil-immersed transformers have problems such as flammability, explosiveness, and complex maintenance, while dry-type transformers have gradually become the first choice for energy storage systems due to their environmental protection, safety, and simple maintenance.

[0003] With the development of energy storage systems, the construction scale of energy storage systems is also gradually increasing. Currently, the scale of energy storage systems is basically above the gigawatt level.

[0004] The operating conditions of the energy storage transformers in the energy storage system are different from those of conventional distribution transformers. Energy storage transformers usually need to operate at full power for 2h - 4h, and the operating conditions are much harsher compared to distribution. During the operation of the energy storage system, it is found that there are the following problems with the energy storage transformers in the energy storage system: It is difficult for the air in the transformer room of the existing energy storage system to effectively dissipate the heat of the transformer body, resulting in a relatively high temperature rise of the dry-type transformers in the existing energy storage system, thereby affecting the overall performance and reliability of the energy storage system.

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

[0006] The technical problem to be solved by the present invention is to provide a box-type substation and an energy storage converter and booster integrated machine aiming at the above deficiencies existing in the prior art, which can optimize the air duct inside the transformer body, thereby better taking away the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0007] In a first aspect, an embodiment of the present invention provides a box-type substation, which includes a housing and a transformer body. A transformer chamber is provided inside the housing; an air inlet is provided at the bottom of the transformer chamber, and an air outlet is provided at the top of the transformer chamber. External air enters the interior of the transformer chamber through the air inlet and is discharged from the air outlet. The transformer body is disposed in the transformer chamber, and the transformer body includes an iron core, a primary winding, a secondary winding, and an isolation insulating cylinder; the secondary winding and the primary winding are wound around the iron core in sequence from the inside to the outside, and there is a first gap between the primary winding and the secondary winding; the isolation insulating cylinder is disposed in the first gap to form a first air supply channel between the primary winding and the isolation insulating cylinder, and a second air supply channel between the secondary winding and the isolation insulating cylinder. After the external air enters the interior of the transformer chamber through the air inlet, it 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 widths of the first air supply channel and the second air supply channel are the same.

[0009] In some embodiments, the transformer body further includes a wind guiding insulating cylinder. The wind guiding insulating cylinder is sleeved outside the primary winding, and a third air supply channel is formed between the wind guiding insulating cylinder and the primary winding. After the external air enters the interior of the transformer chamber 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, and 20 mm ≤ a ≤ 25 mm.

[0011] In some embodiments, a cooling fan is provided below the transformer body, and the cooling fan is used to suck external 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 is horizontally arranged and surrounds the outside of the wind guiding insulating cylinder of the transformer body, the inner circle of the wind baffle is hermetically connected to the wind guiding insulating cylinder, and the outer circle of the wind baffle is hermetically connected to the inner side wall of the transformer chamber to form a wind pressure area between the wind baffle and the bottom wall of the transformer chamber.

[0012] In some embodiments, a low-voltage switch room and a high-voltage switch room are further provided inside the housing. The low-voltage switch room and the high-voltage switch room are adjacent and are both arranged on the same side of the transformer chamber. The transformer chamber, the low-voltage switch room, and the high-voltage switch room are arranged in a pin-shaped structure in the horizontal plane.

[0013] In some embodiments, an induced draft fan is provided at the air outlet for drawing the air in the transformer chamber to the outside.

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

[0015] Thus, for the box-type substation provided by the embodiments of the present invention, by providing a transformer chamber in the housing, arranging an air inlet at the bottom of the transformer chamber, and arranging an air outlet at the top of the transformer chamber, external air can enter the inside of the transformer chamber from the air inlet and be discharged from the air outlet, so that the air in the transformer chamber can circulate, enabling the external cold air to enter the transformer chamber to dissipate heat from the transformer body and then flow out from the air outlet of the transformer chamber, thereby taking away the heat in the transformer chamber. By arranging an isolation insulating cylinder in the first gap between the primary winding and the secondary winding, the insulation effect between the primary winding and the secondary winding can be improved, and 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 to optimize the air duct inside the transformer body. Therefore, after the external air enters the inside of the transformer chamber from the air inlet, it can 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 taking away the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0016] In a second aspect, the embodiments of the present invention further provide an energy storage converter and booster integrated machine, which includes a bottom plate, the box-type substation in the first aspect, and an energy storage converter. The box-type substation and the energy storage converter are both arranged on the bottom plate, and 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 to realize the conversion of the electric energy flowing into or out of the energy storage device.

[0017] In some embodiments, a third gap is provided between the energy storage converter and the transformer chamber of the box-type substation.

[0018] The energy storage converter and booster integrated machine provided by the embodiments of the present invention has the same beneficial effects as the above box-type substation, which will not be elaborated here. Description of the Drawings

[0019] Figure 1 : A schematic diagram of a box-type substation provided by an embodiment of the present invention;

[0020] Figure 2 : A top view of the internal structure of a box-type substation provided by an embodiment of the present invention;

[0021] Figure 3: It is a structural diagram of the transformer body provided by the embodiment of the present invention;

[0022] Figure 4 : It is a longitudinal sectional view of the transformer body provided by the embodiment of the present invention;

[0023] Figure 5 : It is a simulation diagram of the temperature distribution of the transformer body provided by the embodiment of the present invention;

[0024] Figure 6 : It is an internal structural diagram of a box-type substation provided by the embodiment of the present invention;

[0025] Figure 7 : It is an internal structural diagram of a box-type substation provided in the prior art;

[0026] Figure 8 : It is a simulation diagram of the temperature distribution of the transformer body provided in the prior art;

[0027] Figure 9 : It is an air flow model diagram of the transformer room provided by the embodiment of the present invention.

[0028] Among them, 1 - primary winding; 2 - secondary winding; 3 - iron core; 4 - isolation insulating cylinder; 5 - air guiding insulating cylinder; 6 - wind baffle; 7 - cooling fan; 8 - housing; 9 - energy storage converter; 10 - low-voltage switch room; 11 - high-voltage switch room; 12 - transformer room; 13 - grille; 14 - induced draft fan. Specific embodiments

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

[0030] Embodiment 1:

[0031] As Figure 1 shown, the embodiment of the present invention provides a box-type substation, which is applied in the power field and is used to step down the input electric energy and then output it.

[0032] Combining Figure 1 and Figure 2 , the box-type substation includes a housing 8 and a transformer body. Inside the housing 8, there is a transformer room 12. An air inlet is provided at the bottom of the transformer room 12, and an air outlet is provided at the top of the transformer room 12. External air enters the inside of the transformer room 12 through the air inlet and is discharged from the air outlet.

[0033] Exemplarily, as Figure 1 shown, the housing 8 is a box-type structure surrounded by iron sheets and frames to protect the internal structure (such as the transformer body).

[0034] The transformer chamber 12 is used to accommodate the transformer body.

[0035] Exemplarily, the number of the air inlets and the number of the air outlets can both be multiple, and the multiple air inlets and the multiple air outlets can be distributed on different sides of the transformer chamber 12.

[0036] Exemplarily, as Figure 1 shown, a grille 13 is provided at the air inlet of the transformer chamber 12, which is used to filter the air entering the transformer chamber 12 and prevent foreign objects from entering the transformer chamber 12 through the air inlet.

[0037] Exemplarily, as Figure 1 shown, an induced draft fan 14 is provided at the air outlet of the transformer chamber 12, and the induced draft fan 14 is used to draw the air in the transformer chamber 12 to the outside.

[0038] Exemplarily, the number of the induced draft fans 14 is multiple to increase the air flow rate in the transformer chamber 12.

[0039] Through the above settings, the air flow in the transformer chamber 12 can be realized, so that the cold air outside enters the transformer chamber 12 to dissipate heat from the transformer body and then flows out from the air outlet of the transformer chamber 12 in time, thereby taking away the heat in the transformer chamber 12.

[0040] As Figure 2 and Figure 3 shown, the transformer body is arranged in the transformer chamber 12, and the transformer body includes an iron core 3, a primary winding 1, a secondary winding 2 and an isolation insulating cylinder 4. The secondary winding 2 and the primary winding 1 are wound around the iron core 3 in sequence from the inside to the outside, and there is a first gap between the primary winding 1 and the secondary winding 2. The isolation insulating cylinder 4 is arranged in the first gap to form a first air supply channel between the primary winding 1 and the isolation insulating cylinder 4 and a second air supply channel between the secondary winding 2 and the isolation insulating cylinder 4. After the external air enters the interior of the transformer chamber 12 through 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.

[0041] It can be understood that the above-mentioned transformer body is the body of a dry-type transformer, for example, the body of a 35 kV energy storage dry-type transformer. The transformer body is directly in contact with the air in the transformer chamber, and the heat on the transformer body is taken away by the flow of the air in the transformer chamber.

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

[0043] The first gap can provide an insulating gap between the primary winding 1 and the secondary winding 2.

[0044] Exemplarily, the isolation insulating cylinder 4 is fixed on the yoke of the iron core 3 to maintain the position of the isolation insulating cylinder 4. The material of the isolation insulating cylinder 4 is H-class insulating material, and the thickness of the isolation insulating cylinder 4 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 thickness of the isolation insulating cylinder 4, the better the insulation effect that can be provided.

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

[0046] Combined Figure 3 with Figure 4 , after setting the isolation insulating cylinder 4, while 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, optimizing 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 from the inner surface of the primary winding 1 and the outer surface of the secondary winding 2 respectively, thereby better taking away the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0047] Therefore, for the box-type substation provided by the embodiment of the present invention, by arranging a transformer chamber in the housing 8, arranging an air inlet at the bottom of the transformer chamber 12, and arranging an air outlet at the top of the transformer chamber 12, the external air can enter the inside of the transformer chamber 12 from the air inlet and be discharged from the air outlet, realizing the circulation of the air in the transformer chamber 12, enabling the external cold air to enter the transformer chamber 12 to dissipate heat from the transformer body and flow out from the air outlet of the transformer chamber 12, thereby taking away the heat in the transformer chamber 12. By arranging the isolation 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 isolation insulating cylinder 4, and a second air supply channel is formed between the secondary winding 2 and the isolation insulating cylinder 4 to optimize the air duct inside the transformer body. Therefore, after the external air enters the inside of the transformer chamber 12 from the air inlet, it can flow through the first air supply channel to dissipate heat from the inner surface of the primary winding 1 and flow through the second air supply channel to dissipate heat from the outer surface of the secondary winding 2, thereby better taking away the heat inside the transformer body and improving the heat dissipation effect of the transformer body.

[0048] See Figure 5 , Figure 5 is a simulation diagram of the temperature distribution in the transformer chamber 12 after setting the isolation insulating cylinder 4. From Figure 5It can be seen that after the air flow passes through the interior of the transformer body, it can effectively carry away the heat inside the transformer body. Therefore, through Figure 5 The simulation diagram can verify the beneficial effects of the above box-type substation.

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

[0050] That is, the isolation insulating cylinder 4 is arranged at the central position of the first gap, so that the air volumes flowing through the first air supply channel and the second air supply channel are approximately the same, thereby providing approximately the same heat dissipation effect for the inner surface of the primary winding 1 and the outer surface of the secondary winding 2, and avoiding the situation that the width of one of the first air supply channel and the second air supply channel is too low, which affects the heat dissipation effect of the corresponding side winding.

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

[0052] When the transformer body of the dry-type transformer is in operation, the no-load loss in the iron core and the load loss in the windings (including the primary winding 1 and the secondary winding 2, the same below) are all converted into heat, which causes the temperature of the iron core and the windings to rise. In order to limit the temperature of the iron core and the windings within the allowable values specified in the relevant standards and the user's technical agreement, it is necessary to continuously and timely discharge the heat generated by the transformer body from the shell, so that the heat generation is equal to the heat dissipation to form a heat balance.

[0053] The transfer of heat is achieved by conduction, convection and radiation. The heat inside the iron core and windings reaches the surface through heat conduction, and then the heat is dissipated from the surface by the cooling medium (air). The heat dissipation on the surface of the iron core and windings is mainly carried out by convective and radiative heat transfer. When the temperature rise of the dry-type transformer reaches the thermal equilibrium stable state, convective and radiative heat dissipation play a major role, and it is considered that the heat transfer processes of the two do not affect each other, and their effects are the sum of the individual effects of the two. For the exposed heat dissipation surface (such as the outer surface of the primary winding 1), the cooling medium (air) is in direct contact with the heat dissipation surface, with convective and radiative effects; for the inner heat dissipation surface (such as the inner surface of the primary winding 1), there is only convection and the radiative effect is very small and can be ignored.

[0054] In the case of convective heat dissipation, the maximum temperature difference appears in the stationary layer of the cooling medium (air) close to the surface of the heat-generating body. In natural convection, the air flow velocity is about several tens of centimeters per second. By accelerating the air flow velocity, the thickness of the stationary layer of air on the surface of the heat-generating body (the primary winding 1 and the secondary winding 2) of the transformer can be reduced, and the temperature difference between the heat-generating body and the surrounding air will rapidly decrease, thereby reducing the temperature difference between the heat-generating body and the air and improving the heat dissipation effect on the heat-generating body.

[0055] Based on the above principle, in some embodiments, the transformer body further includes a wind guiding insulating cylinder 5. The wind guiding insulating cylinder 5 is sleeved outside the primary winding 1, and a third air supply channel is formed between the wind guiding insulating cylinder 5 and the primary winding 1. After the outside 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 wind guiding insulating cylinder 5 is arranged outside the primary winding 1, so the insulation requirement for the wind guiding insulating cylinder 5 is relatively low.

[0057] Exemplarily, the material of the wind guiding insulating cylinder 5 can be, for example, a Class B insulating material.

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

[0059] Furthermore, as Figure 2 and Figure 3 shown, in order to ensure the insulation between the primary winding 1 and the inner side wall of the transformer chamber 12, it is necessary to ensure the insulation distance L between the primary winding 1 and the inner side wall of the transformer chamber 12. When the wind guiding insulating cylinder 5 is not provided, only air is used as the insulating medium. It can be understood that the insulation ability of the wind guiding insulating cylinder 5 is greater than that of air. Therefore, after the wind guiding insulating cylinder 5 is provided, while ensuring the insulation between the primary winding 1 and the inner side wall of the transformer chamber 12, the insulation distance L between the primary winding 1 and the inner side wall of the transformer chamber 12 can be reduced, thereby reducing the overall size of the transformer chamber 12 and thus reducing the manufacturing cost of the box-type substation.

[0060] It should be noted that when air flows through the third air supply channel, air resistance is generated due to the friction between the inner side wall of the third air supply channel and the air. The air resistance has a certain influence on the flow velocity of the third air supply channel, and thus affects the heat dissipation effect of the third air supply channel. Combining Figure 4 , the width of the third air supply channel is a. The inventor found that when the width a of the third air supply channel decreases, the air resistance generated by the friction between the airway wall of the third air supply channel and the air increases, and the air flow velocity decreases; when the width a of the third air supply channel increases, the air resistance generated by the friction between the airway wall of the third air supply channel and the air decreases, but the chimney effect generated by the third air supply channel decreases, and it will cause uneven air flow distribution in the third air supply channel, affecting the final heat dissipation. Therefore, in order to ensure a better heat dissipation effect of the third air supply channel, it is necessary to accurately set the width a of the third air supply channel.

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

[0062] Exemplarily, the width a of the third air supply channel may be 20 mm, 23 mm, 25 mm, etc.

[0063] By setting the width a of the third air supply channel within the above range, it can ensure that the air flow velocity and the air resistance generated when the air flows through the third air supply channel are within a better range, and ensure uniform air flow distribution within the third air supply channel, so that the air can better dissipate heat from the outer surface of the primary winding 1 when flowing through the third air supply channel.

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

[0065] Exemplarily, the cooling fan 7 is a centrifugal fan, and the air volume of the cooling fan 7 is 2000 m³ / h. The air suction port of the cooling fan 7 is arranged towards the air inlet, and the air outlet of the cooling fan 7 is arranged towards the bottom of the transformer body.

[0066] Exemplarily, the number of the cooling fans 7 can be one or more, for example, six, and two cooling fans 7 are arranged on both sides of each phase winding of the transformer body.

[0067] This can increase the air pressure and initial velocity of the air entering the first air supply channel, the second air supply channel, and the third air supply channel, and then increase the air flow velocity when the air flows through the first air supply channel, the second air supply channel, and the third air supply channel, improving the heat dissipation effect on the transformer body.

[0068] As Figure 7 and Figure 8 shown, only the transformer body and the cooling fan 7 are provided in the transformer chamber 12 in the prior art. Figure 8 is a simulation diagram of the air flow and temperature distribution in the transformer chamber 12 in the prior art. Figure 8 In it, the arrowed lines are the flow directions of the air flow. As can be seen from Figure 8 , the air flow in the transformer chamber in the prior art is relatively disordered. Some of the air entering from the air inlets on both sides of the transformer chamber 12 is directly discharged without flowing through the transformer body to take away heat, resulting in low air utilization rate and poor heat dissipation effect of the air on the transformer body.

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

[0070] Exemplarily, 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 guiding insulating cylinder 5.

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

[0072] Exemplarily, the wind baffle 6 is fixed to the inner side wall of the transformer chamber by a connecting member.

[0073] It can be understood that under the action of the cooling fan 7, a large amount of air is sucked into the air pressure area, so that the air pressure in the air pressure area is greater than the external air pressure, which is conducive to increasing the speed of air flowing through the first air supply channel, the second air supply channel, and the third air supply channel, and improving the heat dissipation effect on the transformer body.

[0074] See Figure 9 , Figure 9 For the air flow model diagram in the transformer chamber 12 after the wind baffle 6 is provided, Figure 9 the blue arrows in Figure 9 are the paths of the air entering the transformer chamber 12, Figure 9 and

[0075] is the air flowing out of the transformer chamber 12. It can be seen from

[0076] that after the wind baffle 6 is provided, the air flow can enter the transformer chamber 12 and the paths of the air flowing out of the transformer chamber 12 in an orderly manner, thus preventing the air from being directly discharged without flowing through the transformer body to carry away heat, and improving the utilization rate of the air entering the transformer chamber 12. Figure 1 and Figure 2 that inside the housing 8, a low-voltage switch room 10 and a high-voltage switch room 11 are further provided. The low-voltage switch room 10 and the high-voltage switch room 11 are adjacent and both are provided on the same side of the transformer chamber 12. The transformer chamber 12, the low-voltage switch room 10, and the high-voltage switch room 11 are arranged in a triangular structure in the horizontal plane.

[0077] Exemplarily, the low-voltage switch room 10 is used to install low-voltage power distribution equipment. The high-voltage switch room 11 is used to install high-voltage power distribution equipment. The structures of the low-voltage power distribution equipment and the high-voltage power distribution equipment, as well as the connection manners between the two and the transformer body, are all prior arts in this field and will not be elaborated herein.

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

[0079] Exemplarily, the low-voltage switch room 10, the high-voltage switch room 11, and the transformer room 12 are separated by partitions (for example, 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] Through the above-mentioned arrangement, the mutual influence of the equipment in the low-voltage switch room 10, the high-voltage switch room 11 and the transformer room 12 can be avoided, and the structure of the box-type substation is made compact, and the difficulty of the design and manufacturing process of the box-type substation is greatly reduced, thereby improving the production efficiency of the box-type substation and reducing the overall manufacturing difficulty and cost of the product; on the other hand, the above-mentioned arrangement also facilitates the setting of switch doors on the low-voltage switch room 10, the high-voltage switch room 11 and the transformer room 12.

[0081] In some embodiments, 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] It can be understood that air can flow through the fourth air supply channel to dissipate heat to the outside of the core 3 and the inside 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, compared with the box-type substation in the prior art, the box-type substation provided by the embodiment of the present invention can improve the heat dissipation efficiency by more than 40%.

[0084] In summary, after improving the heat dissipation effect of the transformer body, the box-type substation provided by the embodiment of the present invention 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] Embodiment 2:

[0086] An embodiment of the present invention further provides an integrated energy storage converter and booster, which is used in an energy storage system to convert and control electrical energy between a power grid and an energy storage device (eg, an energy storage battery).

[0087] like Figure 1 and Figure 2As shown in the figure, the integrated energy storage converter and booster 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 like the Chinese character "mu".

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

[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 of the energy storage converter 9 and the heat generation of the transformer body in the transformer room 12.

[0094] In actual use, the heat generation of the energy storage converter 9 is relatively large, and the heat generation of the transformer body in the transformer room 12 is also relatively large. 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 two heat sources of the energy storage converter 9 and the transformer room 12, and at the same time facilitating the independent heat dissipation of the energy storage converter 9 and the transformer room 12. Therefore, the integrated energy storage converter and booster provided by the embodiments of the present invention do not need to introduce additional refrigeration unit equipment, and can achieve stable heat dissipation through its own air supply and exhaust technology, which is beneficial to reducing the total energy consumption and carbon emissions.

[0095] It is understandable that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A box-type substation, characterized in that: include: A housing (8) having a transformer chamber (12) disposed therein; an air inlet disposed at the bottom of the transformer chamber (12), an air outlet disposed at the top of the transformer chamber (12), external air entering the transformer chamber (12) through the air inlet and being discharged from the air outlet; and, A transformer body is arranged in the transformer chamber (12), the transformer body comprising an iron core (3), a primary winding (1), a secondary winding (2) and an isolating insulating cylinder (4); the secondary winding (2) and the primary winding (1) are wound on the iron core (3) in sequence from the inside to the outside, and a first gap is provided between the primary winding (1) and the secondary winding (2); the isolating insulating cylinder (4) is arranged in the first gap to form a first air supply channel between the primary winding (1) and the isolating insulating cylinder (4), and a second air supply channel is formed between the secondary winding (2) and the isolating insulating cylinder (4); After the external air enters the transformer chamber (12) through 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).

2. The box-type substation according to claim 1, characterized in that: The first air supply channel and the second air supply channel have the same width.

3. The box-type substation according to claim 1, characterized in that: The transformer body also includes an air guide insulating cylinder (5); The wind-guiding insulating cylinder (5) is sleeved on the outside of the primary winding (1), and a third air supply channel is formed between the wind-guiding insulating cylinder (5) and the primary winding (1); After the 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).

4. The box-type substation according to claim 3, characterized in that: The width of the third air supply channel is a, 20mm≤a≤25mm.

5. 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 suck in external air from the air inlet and blow it toward the bottom of the transformer body; A windshield (6) is provided at the bottom of the transformer chamber (12). The windshield (6) is arranged horizontally and surrounds the outside of the wind-guiding insulating cylinder (5) of the transformer body. The inner circle of the windshield (6) is sealed and connected to the wind-guiding insulating cylinder (5), and the outer circle of the windshield (6) is sealed and connected to the inner wall of the transformer chamber (12), so as to form a wind pressure zone between the windshield (6) and the bottom wall of the transformer chamber (12).

6. The box-type substation according to claim 1, characterized in that: A low-voltage switch chamber (10) and a high-voltage switch chamber (11) are also provided inside the housing (8); The low-voltage switch room (10) and the high-voltage switch room (11) are adjacent to each other and are both arranged on the same side of the transformer room (12); the transformer room (12), the low-voltage switch room (10), and the high-voltage switch room (11) are arranged in a herringbone structure in a horizontal plane.

7. The box-type substation according to claim 1, characterized in that: An induced draft fan (14) is provided at the air outlet, for leading the air in the transformer room (12) to the outside.

8. The box-type substation according to claim 1, characterized in that: A second gap is provided between the iron core (3) and the secondary winding (2) so as to form a fourth air supply channel between the iron core (3) and the secondary winding (2).

9. An integrated energy storage, current conversion and voltage boosting machine, characterized in that: It comprises a base plate, a box-type substation as claimed in any one of claims 1 to 8, and an energy storage converter (9); The box-type substation and the energy storage converter (9) are both arranged on the base plate. The box-type substation is electrically connected to an external energy storage device via the energy storage converter and is used to cooperate with the energy storage converter (9) to realize the conversion of electric energy flowing into or out of the energy storage device.

10. The integrated energy storage, current conversion and voltage boosting device according to claim 9, characterized in that: A third gap is provided between the energy storage converter (9) and the transformer room (12) of the box-type substation.

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