American box-type transformer substation

Abstract

The utility model discloses an American box transformer, which relates to the technical field of transformers and comprises a low-voltage chamber, a high-voltage chamber and a transformation chamber. A plurality of shielding type wiring structures which are arranged at intervals along the longitudinal direction are arranged in the high-voltage chamber, the plurality of shielding type wiring structures and the high-voltage bushings are consistent in number and are arranged in a one-to-one correspondence manner, and each shielding type wiring structure comprises a shielding type bushing joint, a shielding type lightning arrester joint and a plurality of shielding type cable joints; in each shielding type wiring structure, a shielding type sleeve joint is connected with a corresponding high-voltage sleeve in an inserted mode, and each shielding type cable joint is connected with a high-voltage incoming cable in an inserted mode, so that each high-voltage incoming cable is connected with the transformation chamber. The low-voltage chamber is internally provided with a plurality of busbars, the plurality of busbars are connected with the transformation chamber through a plurality of low-voltage sleeves, the plurality of busbars are arranged at intervals along the vertical direction, and each busbar is provided with a molded case circuit breaker. The American box transformer substation provided by the utility model is small in size and can be suitable for a relatively complex environment.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an American-style box-type transformer. Background Technology

[0002] To prevent high-voltage current in the high-voltage compartment of a modern American-style prefabricated substation from breaking down the air, electrical clearances need to be reserved between the circuits in the high-voltage compartment to ensure stable operation of the equipment. However, reserving these electrical clearances requires the high-voltage compartment to occupy a large space, resulting in a large size for the American-style prefabricated substation. Furthermore, the low-voltage compartment of the American-style prefabricated substation has many devices and also requires a large space, further increasing the size of the American-style prefabricated substation. This makes it difficult for American-style prefabricated substations to be used in more complex environments. Utility Model Content

[0003] The main purpose of this utility model is to propose an American-style box-type substation, which aims to solve the technical problem that American-style box-type substations are large in size and difficult to apply to more complex environments.

[0004] To achieve the above objectives, the American-style box-type substation proposed in this utility model includes a low-voltage chamber, a high-voltage chamber, and a transformer chamber;

[0005] The high-voltage chamber and the transformer chamber are both located on one side of the low-voltage chamber along the longitudinal direction, and the low-voltage chamber and the high-voltage chamber are distributed sequentially along the transverse direction. A plurality of low-voltage bushings are arranged between the low-voltage chamber and the transformer chamber and are connected to the transformer chamber at intervals along the transverse direction. A plurality of high-voltage bushings are arranged between the high-voltage chamber and the transformer chamber and are connected to the transformer chamber at intervals along the longitudinal direction.

[0006] The high-voltage room is equipped with multiple shielded wiring structures spaced longitudinally. The number of shielded wiring structures and high-voltage bushings are the same and they are arranged in a one-to-one correspondence. Each shielded wiring structure includes a shielded bushing connector, a shielded surge arrester connector, and multiple shielded cable connectors. The multiple shielded cable connectors are spaced laterally. The shielded bushing connectors and the shielded surge arrester connectors are distributed on both sides of the multiple shielded cable connectors along the lateral direction. In each shielded wiring structure, the shielded bushing connector is inserted into its corresponding high-voltage bushing, each shielded cable connector is inserted into a high-voltage incoming cable to connect each high-voltage incoming cable to the transformer room, and the shielded surge arrester connector is inserted into a shielded surge arrester.

[0007] The low-voltage chamber is equipped with multiple busbars, which are connected to the transformer chamber through multiple low-voltage bushings. The multiple busbars are arranged at vertical intervals, and each busbar is equipped with a molded case circuit breaker.

[0008] In one embodiment, the high-voltage chamber is provided with a plurality of longitudinally spaced installation structures, the number of which is consistent with and corresponds one-to-one with the number of shielded wiring structures. Each installation structure includes an installation beam and a plurality of clamps. In each installation structure, the installation beam is installed in the high-voltage chamber and extends laterally, and the plurality of clamps are longitudinally spaced on the installation beam. The number of clamps is consistent with and corresponds one-to-one with the number of high-voltage incoming cables connected in the corresponding shielded wiring structure, and each clamp is fitted on the outside of the corresponding high-voltage incoming cable.

[0009] In one embodiment, a longitudinally extending support beam is installed in the high-voltage room, and multiple shielded surge arresters are supported and installed on the support beam.

[0010] In one embodiment, each of the high-pressure bushings is an external conical bushing, and each of the low-pressure bushings is a resin dry bushing.

[0011] In one embodiment, a frame circuit breaker is provided in the low-voltage room, and multiple busbars are connected to the frame circuit breaker. The frame circuit breaker is connected to multiple low-voltage bushings through copper flexible connectors.

[0012] In one embodiment, a current transformer is provided between each of the busbars and the frame circuit breaker.

[0013] In one embodiment, the low-pressure chamber has an air outlet on the side laterally away from the high-pressure chamber, and the air outlet is located near the top of the low-pressure chamber. The low-pressure chamber has an air inlet on the side longitudinally away from the transformer chamber, and the air inlet is located near the bottom of the low-pressure chamber and away from the air outlet.

[0014] In one embodiment, an exhaust fan is provided at the air outlet.

[0015] In one embodiment, an air intake grille is provided at the air inlet, and a fan cover is provided at the air outlet, which is placed over the exhaust fan.

[0016] In one embodiment, the bottom wall of the high-voltage chamber is equipped with a plurality of glands, the number of which is the same as the number of the high-voltage incoming cables and they are arranged in a one-to-one correspondence. Each high-voltage incoming cable passes through its corresponding gland and extends into the high-voltage chamber to be plugged into the corresponding shielded cable connector.

[0017] The technical solution of this utility model concentrates the high-voltage compartment and transformer compartment on one side of the low-voltage compartment, arranged laterally in a triangular pattern. This arrangement makes more rational use of space in both the longitudinal and lateral directions, resulting in a more compact overall structure and effectively reducing the volume of the American-style transformer substation. Furthermore, this triangular arrangement effectively reduces the length of both low-voltage and high-voltage bushings and facilitates easier layout. The high-voltage compartment is equipped with a shielded wiring structure, which includes shielded bushing connectors, multiple shielded cable connectors, and shielded surge arrester connectors arranged laterally. High-voltage bushings only need to be plugged into the bushing connectors, and each high-voltage incoming cable only needs to be plugged into its corresponding shielded cable connector to connect the high-voltage incoming cable to the transformer, making the connection simple and convenient. Because the high-voltage incoming cables have insulated sheaths, the high-voltage current in the cables can effectively prevent air breakdown. Furthermore, each cable is plugged into a shielded cable connector, which provides insulation protection to the ends of the high-voltage incoming cables, further reducing the risk of current breakdown and thus reducing or eliminating the need for pre-reserved electrical clearances. Therefore, the American-style prefabricated transformer provided by this invention reduces or even eliminates electrical clearances, thereby reducing the volume of the high-voltage compartment and further reducing the overall size of the invention. Moreover, the high-voltage compartment is equipped with multiple shielded wiring structures spaced longitudinally, each including multiple shielded cable connectors spaced laterally. This allows for more high-voltage incoming cables to connect to the transformer compartment within the same high-voltage compartment volume, resulting in higher space utilization and further reducing the volume of the high-voltage compartment. This, in turn, further reduces the size of the American-style prefabricated transformer of this invention, making it better suited for more complex environments. Multiple busbars are spaced longitudinally, which makes more efficient use of the vertical space inside the low-voltage room. This allows for more busbars and electrical equipment to be accommodated within a limited space, improving space utilization and further reducing the overall size of the American-style prefabricated substation. This further meets the requirements of this American-style prefabricated substation for use in more complex environments. The molded case circuit breaker in the low-voltage room provides overload and short-circuit protection, effectively protecting the circuits and equipment and improving the reliability of the low-voltage room. Furthermore, the shielded surge arrester in the high-voltage room effectively limits transient overvoltages such as lightning overvoltages and switching overvoltages, providing overload protection for the high-voltage room and improving its reliability. This further enhances the stability of the American-style prefabricated substation, making it more suitable for more complex environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A top perspective view of an embodiment of the American-style box-type substation provided by this utility model;

[0020] Figure 2 A partial perspective view of the high-voltage compartment in an embodiment of the American-style box-type substation provided by this utility model;

[0021] Figure 3 A partial perspective view of the low-voltage compartment in an embodiment of the American-style box-type substation provided by this utility model;

[0022] Figure 4 This is a rear view of the low-voltage compartment of an embodiment of the American-style prefabricated transformer provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 100. American-style prefabricated substation; 10. High-voltage compartment; 11. Shielded wiring structure; 111. Shielded bushing connector; 112. Shielded surge arrester connector; 113. Shielded cable connector; 114. High-voltage incoming cable; 115. Shielded surge arrester; 116. Installation structure; 1161. Mounting beam; 1162. Clamp; 117. Support beam; 118. Gland; 20. Low-voltage compartment; 21. Busbar; 22. Molded case circuit breaker; 23. Frame circuit breaker; 24. Copper flexible connector; 25. Current transformer; 26. Air outlet; 27. Air inlet; 28. Air intake grille; 30. Transformer compartment; 40. High-voltage bushing; 50. Low-voltage bushing.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] To prevent high-voltage current in the high-voltage compartment of a modern American-style prefabricated substation from breaking down the air, electrical clearances need to be reserved between the circuits in the high-voltage compartment to ensure stable operation of the equipment. However, reserving these electrical clearances requires the high-voltage compartment to occupy a large space, resulting in a large size for the American-style prefabricated substation. Furthermore, the low-voltage compartment of the American-style prefabricated substation has many devices and also requires a large space, further increasing the size of the American-style prefabricated substation. This makes it difficult for American-style prefabricated substations to be used in more complex environments.

[0030] This utility model proposes an American-style box-type transformer substation 100.

[0031] Please see Figures 1 to 4In one embodiment of this utility model, the American-style box-type substation 100 includes a low-voltage compartment 20, a high-voltage compartment 10, and a transformer compartment 30. Both the high-voltage compartment 10 and the transformer compartment 30 are located on one side of the low-voltage compartment 20 along its longitudinal direction, and are sequentially distributed along its transverse direction. Multiple low-voltage bushings 50 are arranged between the low-voltage compartment 20 and the transformer compartment 30, spaced laterally. Multiple high-voltage bushings 40 are arranged between the high-voltage compartment 10 and the transformer compartment 30, spaced longitudinally. Multiple shielded wiring structures 11 are arranged within the high-voltage compartment 10, spaced longitudinally. The number of shielded wiring structures 11 and high-voltage bushings 40 is the same and they correspond one-to-one. Each shielded wiring structure 11 includes a shielded bushing connector 111 and a shielded surge arrester connector 112. The transformer 30 is equipped with multiple shielded cable connectors 113, which are spaced laterally. Shielded bushing connectors 111 and shielded surge arrester connectors 112 are distributed on both sides of the shielded cable connectors 113 along the lateral direction. In each shielded wiring structure 11, the shielded bushing connector 111 is plugged into its corresponding high-voltage bushing 40, and each shielded cable connector 113 is plugged into a high-voltage incoming cable 114 to connect the high-voltage incoming cable 114 to the transformer room 30. The shielded surge arrester connector 112 is plugged into a shielded surge arrester 115. Multiple busbars 21 are provided in the low-voltage room 20. The multiple busbars 21 are connected to the transformer room 30 through multiple low-voltage bushings 50. The multiple busbars 21 are spaced vertically, and each busbar 21 is equipped with a molded case circuit breaker 22.

[0032] Horizontal Figure 1 The left and right directions, and the vertical direction are Figure 1 The front and back directions, and the vertical direction are... Figure 2 The up and down directions in the middle.

[0033] The technical solution of this utility model concentrates the high-voltage chamber 10 and the transformer chamber on one side of the low-voltage chamber 20, arranged laterally, so that the transformer chamber 30, high-voltage chamber 10 and low-voltage chamber 20 are arranged in a triangular shape. This makes the space utilization of the entire transformer substation more reasonable in both the longitudinal and lateral directions, the overall structure more compact, and effectively reduces the volume of the American-style transformer substation 100. Furthermore, the triangular arrangement effectively reduces the length of the low-voltage bushing 50 and the high-voltage bushing 40, and makes their arrangement more convenient. The high-voltage chamber 10 is equipped with a shielded wiring structure 11, which includes shielded bushing connectors 111, multiple shielded cable connectors 113, and shielded surge arrester connectors 112 arranged sequentially in the left-right direction. The high-voltage bushing 40 only needs to be inserted into the bushing connector, and each high-voltage incoming cable 114 only needs to be inserted into its corresponding shielded cable connector 113 to connect the high-voltage incoming cable 114 to the transformer, making the connection simple and convenient. Because the high-voltage incoming cable 114 has an insulated sheath, it can effectively prevent the high-voltage current in the cable from breaking down the air. Furthermore, each cable is plugged into a shielded cable connector 113, which provides insulation protection to the ends of the high-voltage incoming cable 114, further reducing the risk of current breakdown and thus reducing or eliminating the need for pre-reserved electrical clearances. Therefore, the American-style prefabricated substation 100 provided by this invention can reduce the volume of the high-voltage chamber 10 by reducing or even eliminating electrical clearances, thereby further reducing the overall size of this invention. Moreover, the high-voltage chamber 10 is equipped with multiple shielded wiring structures 11 spaced apart along the front-to-back direction. Each shielded wiring structure 11 includes multiple shielded cable connectors 113 spaced apart along the left-to-right direction, allowing more high-voltage incoming cables 114 to connect to the transformer chamber 30 within the same volume of the high-voltage chamber 10. This results in higher space utilization and further reduces the volume of the high-voltage chamber 10, thus further reducing the size of the American-style prefabricated substation 100 of this invention, making it better suited for more complex environments. Multiple busbars 21 are spaced apart in the vertical direction. This vertical arrangement can make more efficient use of the vertical space inside the low-voltage room 20, allowing more busbars 21 and electrical equipment to be accommodated in a limited space, thus improving space utilization and further reducing the overall volume of the American-style box-type substation 100. This can further meet the needs of the American-style box-type substation 100 of this utility model to be suitable for more complex environments.The molded case circuit breaker 22 inside the low-voltage compartment 20 provides overload and short-circuit protection, effectively protecting the safe operation of the circuit and equipment and improving the reliability of the low-voltage compartment 20. Furthermore, the shielded surge arrester 115 inside the high-voltage compartment 10 effectively limits transient overvoltages such as lightning overvoltages and operational overvoltages, providing overload protection for the high-voltage compartment 10 and further improving its operational reliability. This, in turn, enhances the operational stability of the American-style transformer substation 100, making it more suitable for complex environments.

[0034] In one embodiment of this utility model, a plurality of installation structures 116 are arranged longitudinally at intervals in the high-voltage chamber 10. The number of installation structures 116 is the same as that of the shielded wiring structure 11 and they correspond one-to-one. Each installation structure 116 includes an installation beam 1161 and a plurality of clamps 1162. In each installation structure 116, the installation beam 1161 is installed in the high-voltage chamber 10 and extends laterally. The plurality of clamps 1162 are arranged longitudinally at intervals on the installation beam 1161. The number of clamps 1162 is the same as that of the high-voltage incoming cables 114 connected in the corresponding shielded wiring structure 111 and they correspond one-to-one. Each clamp 1162 is sleeved on the outside of the corresponding high-voltage incoming cable 114.

[0035] Specifically, such as Figure 2 As shown, multiple mounting beams 1161 are provided in the high-voltage chamber 10. The multiple mounting beams 1161 are spaced apart in the front-to-back direction and each mounting beam 1161 extends in the left-to-right direction. Multiple clamps 1162 are installed on the mounting beams 1161 at intervals in the left-to-right direction. Multiple high-voltage incoming cables 114 that are plugged into the shielded wiring structure 11 corresponding to each mounting structure 116 can be fixed through the multiple clamps 1162 on each mounting beam 1161. The high-voltage incoming cables 114 can be firmly installed, the structural reliability is higher, and thus the operational stability of the American-style box-type substation 100 of this utility model is improved, so that this utility model can be more suitable for more complex environments.

[0036] In one embodiment of this utility model, a longitudinally extending support beam 117 is installed inside the high-voltage chamber 10, and multiple shielded surge arresters 115 are supported and installed on the support beam 117.

[0037] Specifically, such as Figure 2 As shown, by installing the shielded surge arrester 115 inside the high-voltage chamber 10, the shielded surge arrester 115 can be installed stably, and the structural reliability is higher, thereby improving the operational stability of the American-style box-type substation 100 of this utility model, so that this utility model can be more suitable for more complex environments.

[0038] In one embodiment of this utility model, each high-pressure bushing 40 is an outer conical bushing, and each low-pressure bushing 50 is a resin dry bushing.

[0039] Specifically, the compact structure of the outer conical bushing helps reduce the overall volume of the American-style transformer substation 100 of this invention. Furthermore, the outer conical bushing possesses excellent insulation properties and high withstand voltage, thereby improving the applicability of the American-style transformer substation 100 of this invention. The resin dry bushing exhibits good weather resistance and chemical corrosion resistance, maintaining stable performance under harsh environmental conditions, which can further enhance the applicability of the American-style transformer substation 100 of this invention.

[0040] In one embodiment of this utility model, a frame circuit breaker 23 is provided in the low-pressure chamber 20, and multiple busbars 21 are connected to the frame circuit breaker 23. The frame circuit breaker 23 is connected to multiple low-pressure bushings 50 through copper flexible connectors 24.

[0041] Specifically, multiple busbars 21 are connected to the frame circuit breaker 23, and multiple low-voltage bushings 50 are then connected to the frame circuit breaker 23 via flexible copper connectors, thus connecting the multiple busbars 21 to the transformer. By installing the frame circuit breaker 23 between the busbars 21 and the transformer, overload and short-circuit protection can be provided for both the busbars 21 and the transformer. In the event of a circuit abnormality, the busbars 21 can be disconnected from the transformer to protect equipment safety and improve reliability. Due to the good flexibility of the copper flexible connector 24, connecting the low-voltage bushings 50 to the frame circuit breaker 23 using the copper flexible connector 24 is convenient and simple to install.

[0042] In one embodiment of this utility model, a current transformer 25 is provided between each busbar 21 and the frame circuit breaker 23.

[0043] Specifically, the current transformer 25 can monitor the current in the busbar 21 in real time and transmit the current signal to the frame circuit breaker 23. Thus, in the event of overload or short circuit, the current transformer 25 can more accurately cause the frame circuit breaker 23 to disconnect the busbar 21 from the transformer, resulting in better protection and higher reliability.

[0044] In one embodiment of the present invention, an air outlet 26 is provided on the side of the low-pressure chamber 20 away from the high-pressure chamber 10 in the horizontal direction. The air outlet 26 is located near the top of the low-pressure chamber 20. An air inlet 27 is provided on the side of the low-pressure chamber 20 away from the transformer chamber 30 in the longitudinal direction. The air inlet 27 is located near the bottom of the low-pressure chamber 20 and away from the air outlet 26.

[0045] Specifically, such as Figure 3 and Figure 4As shown, an air outlet 26 is located on the right side of the low-pressure chamber 20, near the top of the chamber. Since hot air is less dense and rises naturally, this design allows the rising hot air within the chamber to be quickly expelled from the outlet 26, accelerating the exhaust and improving heat dissipation efficiency and performance. An air inlet 27 is located on the rear side of the low-pressure chamber 20, near the bottom and away from the right side. Since cold air is denser and sinks, this arrangement allows cold air to gradually rise after entering the bottom of the chamber, forming convection with the hot air and effectively carrying away the heat generated during operation, resulting in higher heat dissipation efficiency and better performance. Furthermore, the distance between the outlet 26 and the inlet 27 allows air to flow more comprehensively throughout the low-pressure chamber 20, thus more evenly dissipating heat and further enhancing heat dissipation.

[0046] In one embodiment of this utility model, an exhaust fan is provided at the air outlet 26. The exhaust fan can accelerate the air convection speed in the low-pressure chamber 20, thereby further improving the heat dissipation efficiency and achieving a better heat dissipation effect.

[0047] In one embodiment of this utility model, an air intake grille 28 is provided at the air inlet 27, and a fan cover covering the exhaust fan is provided at the air outlet 26.

[0048] Specifically, such as Figure 3 and Figure 4 As shown, the air intake grille 28 at the air inlet 27 effectively filters large particles such as dust and debris from the air, preventing them from entering the low-voltage compartment 20 of the American-style transformer substation 100. This avoids contamination and damage to electrical equipment, improving equipment reliability and service life. Furthermore, the air intake grille 28 provides some protection for the electrical equipment at the air inlet 27, preventing foreign objects from entering and causing short circuits or damage, thus improving equipment operational safety. The fan guard installed at the air outlet 26, covering the exhaust fan, effectively prevents personnel or foreign objects from contacting the blades of the operating exhaust fan, avoiding accidents or equipment damage, and improving equipment safety and reliability.

[0049] In one embodiment of this utility model, a plurality of glands 118 are installed on the bottom wall of the high-voltage chamber 10. The number of glands 118 and the number of high-voltage incoming cables 114 are the same and are arranged in a one-to-one correspondence. Each high-voltage incoming cable 114 passes through its corresponding gland 118 and extends into the high-voltage chamber 10 to be plugged into the corresponding shielded cable connector 113.

[0050] Specifically, such as Figure 2As shown, glands 118 are provided on the bottom wall of the high-voltage chamber 10 at the positions corresponding to each high-voltage incoming cable 114. The glands 118 have through holes, through which the high-voltage incoming cables 114 extend into the high-voltage chamber 10. The high-voltage incoming cables 114 can be fixed by the glands 118, thereby improving the installation stability of the high-voltage incoming cables 114 and making the structure more reliable.

[0051] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A US box transformer characterized in that, The American box transformer comprises a low-voltage chamber, a high-voltage chamber and a transformer chamber; The high-voltage chamber and the transformer chamber are arranged on one side of the low-voltage chamber along the longitudinal direction, and the low-voltage chamber and the high-voltage chamber are arranged in sequence along the transverse direction; a plurality of low-voltage bushings are arranged between the low-voltage chamber and the transformer chamber and are connected to the transformer chamber along the transverse direction; a plurality of high-voltage bushings are arranged between the high-voltage chamber and the transformer chamber and are connected to the transformer chamber along the longitudinal direction; A plurality of shielded wiring structures are arranged in the high-voltage chamber along the longitudinal direction; the number of the shielded wiring structures is consistent with the number of the high-voltage bushings, and the shielded wiring structures are arranged one by one in correspondence with the high-voltage bushings; each shielded wiring structure comprises a shielded bushing connector, a shielded lightning arrester connector and a plurality of shielded cable connectors; the shielded cable connectors are arranged in the shielded wiring structure along the transverse direction; the shielded bushing connector and the shielded lightning arrester connector are arranged on both sides of the shielded cable connectors along the transverse direction; in each shielded wiring structure, the shielded bushing connector is connected to the corresponding high-voltage bushing, each shielded cable connector is connected to a high-voltage incoming line cable, so as to connect the high-voltage incoming line cable to the transformer chamber, and the shielded lightning arrester connector is connected to a shielded lightning arrester. A plurality of busbars are arranged in the low-voltage chamber; the busbars are connected to the transformer chamber through the low-voltage bushings; the busbars are arranged in the low-voltage chamber along the vertical direction; and each busbar is provided with a molded case circuit breaker.

2. The American box transformer as claimed in claim 1, characterized in that A plurality of mounting structures are arranged in the high-voltage chamber along the longitudinal direction; the number of the mounting structures is consistent with the number of the shielded wiring structures, and the mounting structures are arranged one by one in correspondence with the shielded wiring structures; each mounting structure comprises a mounting beam and a plurality of clamps; in each mounting structure, the mounting beam is arranged in the high-voltage chamber and extends along the transverse direction; the clamps are arranged in the mounting beam along the longitudinal direction; the number of the clamps is consistent with the number of the high-voltage incoming line cables connected to the corresponding shielded wiring structure, and each clamp is arranged on the outside of the corresponding high-voltage incoming line cable.

3. The American box transformer as claimed in claim 1, characterized in that A support beam extending along the longitudinal direction is arranged in the high-voltage chamber; and each shielded lightning arrester is supported and arranged on the support beam.

4. The American box transformer as claimed in claim 1, characterized in that Each high-voltage bushing is an outer tapered bushing, and each low-voltage bushing is a resin dry-type bushing.

5. The American box transformer according to any of claims 1 to 4, characterized in that A frame circuit breaker is arranged in the low-voltage chamber; and each busbar is connected to the frame circuit breaker; the frame circuit breaker is connected to the low-voltage bushings through copper flexible connectors.

6. The US box transformer of claim 5, wherein, A current transformer is arranged between each busbar and the frame circuit breaker.

7. The American box transformer according to any one of claims 1 to 4, characterized in that An air outlet is arranged on the side of the low-voltage chamber away from the high-voltage chamber along the transverse direction; the air outlet is arranged close to the top of the low-voltage chamber; an air inlet is arranged on the side of the low-voltage chamber away from the transformer chamber along the longitudinal direction; and the air inlet is arranged close to the bottom of the low-voltage chamber and away from the air outlet.

8. The American box transformer as claimed in claim 7, characterized in that An exhaust fan is arranged at the air outlet.

9. The American box transformer as claimed in claim 8, characterized in that An air inlet grille is arranged at the air inlet; and a fan shroud is arranged outside the exhaust fan at the air outlet.

10. The American box transformer according to any one of claims 1 to 4, characterized in that The bottom wall of the high-voltage chamber is provided with a plurality of Luer tips, the number of the Luer tips is consistent with that of the high-voltage incoming cables, and each high-voltage incoming cable is inserted into the high-voltage chamber through the corresponding Luer tip to be plugged with the corresponding shielded cable joint.

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