Box-type substation and box body thereof

Abstract

The invention relates to the field of power distribution equipment, and provides a box-type substation and a box thereof.The box comprises a main framework and a switch mounting frame, the main framework is matched with a side plate, a top cover and a door plate to define a box inner cavity, the box inner cavity is provided with a switch mounting space, and a switch fixing structure used for fixedly mounting a switch module is arranged on the switch mounting frame; the switch installation frame comprises two stand columns arranged in a front-back spaced mode, at least two cross beams connected with the two stand columns and lower supports arranged at the bottoms of the stand columns, and the main body framework is provided with a top opening allowing the switch installation frame to be hoisted into the switch installation space when the top cover is not installed. The front-back size of the portion where two stand columns of the switch installation frame are located is smaller than the front-back size of the switch installation space, and a lower support of the switch installation frame is supported on a base of the main body framework and fixed. And the compatibility of the box-type substation and the flexibility during installation are improved while the force bearing requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of distribution equipment, and particularly to a box-type substation and its box body. Background Art

[0002] A box-type substation, that is, a prefabricated substation or a prefabricated transformer substation, is a compact indoor or outdoor distribution equipment prefabricated in a factory. The Hua-type substation is a type of box-type substation, which has the characteristics of small volume, compact structure, safe and reliable operation, convenient maintenance, and mobility, and is widely used in new energy box substation technology.

[0003] A switch module is installed in the box body of the box-type substation, such as a high-voltage circuit breaker switch, a three-position disconnector, etc. The box body is usually formed by a main body frame and side plates, a top cover, and a door plate covering the main body frame. The main body frame is spliced by profiles such as columns and crossbeams. For the installation of the switch module in the box body, an installation seat for installing the switch is usually fixed on the columns or crossbeams of the main body frame of the box body, and the columns or crossbeams of the main body frame of the box body are used as the bearing foundation for the heavy switch module. However, this installation method makes the installation of the switch module depend on the bearing parts on the main body frame. Since the positions of the columns or crossbeams of the main body frame of the box body are fixed, when the switch module is installed in the box body, the installation position is limited and cannot be adjusted appropriately according to the space in the box body, and the installation is not flexible enough. Summary of the Invention

[0004] The purpose of the present invention is to provide a box body of a box-type substation to solve the problem that the structure of using the main body frame of the box body of the existing box-type substation as the bearing foundation for the installation of the switch module makes the installation not flexible enough; the present invention also provides a box-type substation to solve the above technical problems.

[0005] Technical solution of the box body of the box-type substation of the present invention: A box body of a box-type substation, the box body includes a main body frame and a switch mounting frame. The main body frame cooperates with side plates, a top cover, and a door plate to enclose an inner cavity of the box. The inner cavity of the box has a switch installation space. The switch mounting frame is provided with a switch fixing structure for fixedly installing a switch module. The switch mounting frame includes two columns arranged at intervals front and back, at least two crossbeams connecting the two columns, and a lower support provided at the bottom of the columns. The main body frame has a top opening for the switch mounting frame to be hoisted into the switch installation space when the top cover is not installed. The front and back dimensions of the part where the two columns of the switch mounting frame are located are smaller than the front and back dimensions of the switch installation space. The lower support of the switch mounting frame supports on the base of the main body frame and is fixed.

[0006] Further, one of the crossbeams is fixed to the tops of the two columns, and this crossbeam forms the upper crossbeam. The length of the upper crossbeam is greater than the front-to-back dimension of the part of the two columns of the switch mounting frame. The two ends of the upper crossbeam are detachably connected to two top side beams spaced apart front and back at the top of the main body skeleton.

[0007] Further, bolt connection holes for fixedly connecting with the top cover by bolts are provided on the upper crossbeam.

[0008] Further, the lower support extends in the left-right direction. The column is fixed at a position on one end of the lower support biased in the left-right direction. A reinforcing diagonal brace is provided between the other end of the lower support in the left-right direction and the column.

[0009] Further, the switch fixing structure is arranged on the column.

[0010] Further, an upper sealing plate and a lower sealing plate are also arranged between the two columns. A space for installing the switch module is formed between the upper sealing plate and the lower sealing plate. The switch fixing structure is arranged on the part of the column located between the upper sealing plate and the lower sealing plate.

[0011] Further, the lower sealing plate includes a separately arranged upper lower sealing plate and a lower lower sealing plate.

[0012] Further, the lower support is fixedly connected to the base of the main body skeleton by bolts. A plurality of bolt connection holes are arranged at intervals in the left-right direction on the base for the lower support to be able to connect to different bolt connection holes.

[0013] Further, the column is a channel steel section, and column reinforcing ribs are also arranged in the groove of the column.

[0014] Beneficial effects: The present invention pioneeringly provides a box body of a box-type substation. The switch module is installed by using a switch mounting frame independent of the main body skeleton. The two columns of the switch mounting frame are fixedly connected to each crossbeam to form an independent frame structure, ensuring the load-bearing performance after the switch module is installed. At the same time, since the main body skeleton is an open structure when the top cover, side plates and door panels are not installed, the top opening of the main body skeleton can be used as the hoisting entrance for the independent switch mounting frame, so that the switch mounting frame can be integrally installed into the switch installation space in the box body. The lower support of the switch mounting frame is supported on the base of the main body skeleton and fixed, without relying on the columns and crossbeams of the main body skeleton as the load-bearing foundation. The front-to-back dimension of the part where the two columns of the switch mounting frame are located is smaller than the front-to-back dimension of the switch installation space, meeting the hoisting requirements and allowing the position of the switch mounting frame to be moderately changed. Before the switch mounting frame is fixed to the base of the main body skeleton, the position of the switch mounting frame can be finely adjusted left and right according to the size of the corresponding switch module to accommodate errors, and the installation is relatively flexible.

[0015] The technical solution of the box-type substation of the present invention: A box-type substation includes a box body and a switch module installed in the box body. The box body includes a main body skeleton and a switch mounting rack. The main body skeleton cooperates with side plates, a top cover, and a door panel to enclose an inner cavity of the box. The inner cavity of the box has a switch installation space. The switch mounting rack is provided with a switch fixing structure for fixedly installing the switch module. The switch mounting rack includes two columns arranged at intervals front and rear, at least two cross beams connecting the two columns, and a lower support provided at the bottom of the columns. The main body skeleton has a top opening for hoisting the switch mounting rack into the switch installation space when the top cover is not installed. The front and rear dimensions of the part of the two columns of the switch mounting rack are smaller than the front and rear dimensions of the switch installation space. The lower support of the switch mounting rack supports on the base of the main body skeleton and is fixed.

[0016] Further, one of the cross beams is fixed to the tops of the two columns and forms an upper cross beam. The length of the upper cross beam is greater than the front and rear dimensions of the part of the two columns of the switch mounting rack. The two ends of the upper cross beam are respectively detachably connected to two top side beams spaced front and rear at the top of the main body skeleton.

[0017] Further, the upper cross beam is provided with bolt connection holes for fixedly connecting with the top cover by bolts.

[0018] Further, the lower support extends in the left-right direction. The columns are fixed at a position on one end of the lower support biased in the left-right direction. A reinforcing diagonal brace is provided between the other end of the lower support in the left-right direction and the columns.

[0019] Further, the switch fixing structure is arranged on the columns.

[0020] Further, an upper sealing plate and a lower sealing plate are also arranged between the two columns. A space for installing the switch module is formed between the upper sealing plate and the lower sealing plate. The switch fixing structure is arranged on the part of the columns located between the upper sealing plate and the lower sealing plate.

[0021] Further, the lower sealing plate includes a separately arranged lower upper sealing plate and a lower lower sealing plate.

[0022] Further, the lower support is fixedly connected to the base of the main body skeleton by bolts. A plurality of bolt connection holes are arranged at intervals in the left-right direction on the base for the lower support to be able to connect to different bolt connection holes.

[0023] Further, the columns are channel steel profiles, and column reinforcing ribs are also arranged in the grooves of the columns.

[0024] Beneficial effects: The present invention changes the installation structure of the switch module in the existing box-type substation. An independent switch mounting frame for installing the switch module is provided inside the box body of the box-type substation. While meeting the load-bearing performance, the independent switch mounting frame is more convenient for installation. Since the volumes of switch modules of different models vary, the switch installation space in the box body with a fixed installation position of the switch module in the prior art may not be suitable for switch modules of certain sizes. However, in the box-type substation of the present invention, the independent switch mounting frame can adjust its position in the left-right direction, overcoming the problem that some switch modules cannot be installed in the box-type substation due to inappropriate sizes, and solving the problem that the structure of using the main body framework of the box body as the load-bearing foundation for installing the switch module in the prior art makes the installation not flexible enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of the box body (without the top cover and door panel) of the box-type substation according to an embodiment of the present invention.

[0026] Figure 2 is Figure 1 the front view of the switch mounting frame (with the switch module installed) in Figure 3 is Figure 1 the side view of the switch mounting frame (with the switch module installed) in Figure 4 is Figure 1 the top view of the switch mounting frame (with the switch module installed) in

[0027] In the figure: 1, front mounting column; 2, rear mounting column; 3, lower support; 4, column stiffener; 7, triangular stiffener; 8, lower cross beam; 9, reinforcing diagonal brace; 10, upper sealing plate; 11, upper sealing plate of the lower part; 12, lower sealing plate of the lower part; 13, upper cross beam; 15, upper sealing plate stiffener; 16, switch module; 17, box body; 171, base; 172, top side beam; 173, door frame column; 174, high-voltage chamber; 175, low-voltage chamber; 176, partition board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0029] The principle and concept of the present invention is to design a box body of a box-type substation. The box body has a switch mounting frame independent of the main body frame for supporting a high-voltage circuit breaker switch. During the assembly process of the box body, first, the main body frame, side plates, and door plates are enclosed to form a basic frame and a switch mounting space. Before installing the top cover, the switch mounting frame can be hoisted into the switch mounting space, and then the switch mounting frame is fixedly installed on the base of the main body frame. During the process of fixing the switch mounting frame, the position of the switch mounting frame can also be finely adjusted to install switch modules of different models and volumes at appropriate positions in the box body of the box-type substation, improving the flexibility and compatibility of the installation of switch modules and solving the problem that the structure of using the main body frame of the box body as the bearing foundation for installing switch modules in the prior art makes the installation less flexible.

[0030] Based on the above principle, the present invention provides a box body of a box-type substation and various embodiments thereof.

[0031] In a basic embodiment, as Figures 1-4 In the provided embodiment, the box body of the box-type substation provided by the present invention includes a main body frame. The main body frame is a cubic frame, which includes a base 171, columns fixed on the base, and crossbeams fixed at the tops of the columns. Door frames are formed at the front and rear of the main body frame for installing door plates. A top cover is fixed at the top of the main body frame (not shown in the figure), and the top cover covers the entire top opening of the main body frame. Side plates are fixed on the remaining sides of the main body frame, so that the main body frame, in cooperation with the side plates, top cover, and door plates, can enclose a relatively closed box inner cavity. A partition 176 is also fixed in the box inner cavity. Top side beams forming a high-voltage chamber door frame, top side beams forming a low-voltage chamber door frame, and top side beams fixed on the top of the partition 176 are provided at the top of the main body frame. Each top side beam 172 is arranged at intervals front and back, and the top cover is fixedly connected to each top side beam. The high-voltage chamber door frame and the low-voltage chamber door frame face away from each other. There are two high-voltage chamber door frames, and the two high-voltage chamber door frames share a door frame column 173 located in the middle position. The partition 176 divides the internal space of the box body into two parts, thus forming a high-voltage chamber 174 and a low-voltage chamber 175. Both the high-voltage chamber 174 and the low-voltage chamber 175 have door plates. A switch module 16 is installed in the high-voltage chamber. The switch module 16 includes a high-voltage circuit breaker switch and a three-position disconnector switch, both of which are high-voltage switches and are equipped with corresponding operating mechanisms.

[0032] For the convenience of the fixed installation of the switch module, the box body further includes a switch mounting rack installed in the main body framework. The switch mounting rack is installed in the high-voltage chamber 174, and the high-voltage chamber 174 forms a switch installation space for installing the switch module 16. The switch mounting rack includes a front mounting column 1 and a rear mounting column 2 arranged at intervals in the front and rear directions, and an upper cross beam 13 and a lower cross beam 8 connecting the two mounting columns. The front mounting column 1 and the rear mounting column 2 are the columns of the switch mounting rack, and the upper cross beam 13 and the lower cross beam 8 are the cross beams of the switch mounting rack. A vertical frame structure is formed by splicing the mounting columns and the cross beams. A lower support 3 is further provided at the bottom of the mounting column. The lower support 3 is supported on the base 171 of the main body framework and fixed. A switch fixing structure for installing the switch module 16 is provided on the switch mounting rack; the dimensions of the front mounting column 1 and the rear mounting column 2 in the front and rear directions are smaller than the dimensions of the high-voltage chamber in the front and rear directions. The main body framework has a top opening for the switch mounting rack to be hoisted into the switch installation space when the top cover is not installed, so as to facilitate the overall hoisting of the switch mounting rack into the main body framework and fine-tuning the position left and right.

[0033] The switch module 16 is installed by using a switch mounting rack independent of the main body framework. The two columns of the switch mounting rack are fixedly connected to each cross beam to form an independent frame structure, ensuring the load-bearing performance after the switch module is installed. At the same time, since the main body framework is an open structure when the top cover, side plates and door panels are not installed, the top opening of the main body framework can be used as the hoisting entrance for the independent switch mounting rack, so that the switch mounting rack can be integrally installed into the switch installation space in the box body. The lower support 3 of the switch mounting rack is supported on the base of the main body framework and fixed, without relying on the columns and cross beams of the main body framework as the load-bearing foundation. The front and rear dimensions of the part where the two columns of the switch mounting rack are located are smaller than the front and rear dimensions of the switch installation space, meeting the hoisting requirements and allowing the position of the switch mounting rack to be moderately changed. Before the switch mounting rack is fixed to the base of the main body framework, the position of the switch mounting rack can be fine-tuned left and right according to the size of the corresponding switch module, compatible with errors, universal and flexible to install. Moreover, the switch mounting rack is set separately, which can also simplify the structure of the box body. The columns and cross beams of the box body do not need to bear the heavy switch module 16 and can use profiles with low strength, which is beneficial to cost control.

[0034] Based on the above embodiments, in one embodiment, such as Figures 1-4In the provided embodiment, the upper crossbeam 13 is fixedly arranged at the top positions of the front mounting column 1 and the rear mounting column 2. The length of the upper crossbeam 13 is greater than the distance between the two mounting columns. The upper crossbeam 13 extends forward and backward. The front and rear dimensions of the two-column part of the switch mounting frame, that is, the distance between the opposite side surfaces of the front mounting column 1 and the rear mounting column 2, is less than the length of the upper crossbeam 13. The length of the upper crossbeam 13 is adapted to the front and rear dimensions of the high-voltage chamber. After the switch mounting frame is installed into the main body framework, the two ends of the upper crossbeam 13 are detachably connected to two top side beams 172 on the box body 17 respectively to fix the entire switch mounting frame. The upper crossbeam 13 of the switch mounting frame has a longer length and the part below the upper crossbeam 13 has a smaller size, which is convenient for hoisting and at the same time uses the upper crossbeam 13 to ensure stable and reliable fixed installation.

[0035] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, bolt connection holes for connecting with the top cover are further arranged on the upper crossbeam 13. The upper crossbeam 13 and the top cover can be connected by bolts to improve the stability of the switch mounting frame and the stability of the top cover. In other embodiments, the upper crossbeam may not be connected to the top cover.

[0036] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, the circuit breaker switch and the three-position disconnector of the switch module 16 are arranged left and right. The switch module 16 is installed on the switch mounting frame in the left-right direction and one end of the switch module 16 with the circuit breaker is heavier and the other end is lighter; in this embodiment, the lower support 3 extends in the left-right direction. The front mounting column 1 and the rear mounting column 2 are respectively installed at the positions near one end in the left-right direction on the corresponding lower support 3. One end of the switch module 16 facing the column installation position is lighter, and a reinforcing diagonal brace 9 is arranged between the other end of the lower support 3 and the corresponding mounting column. One end of the switch module where the reinforcing diagonal brace 9 is located is heavier. By controlling the position of the column in the left-right direction on the lower support 3, when the heavier end of the switch module 16 is installed, it extends towards the longer end of the lower support 3 and the reinforcing diagonal brace 9 is added, which improves the overall balance performance of the switch mounting frame, prevents the switch mounting frame from tipping over towards the heavier end of the switch module, and at the same time avoids occupying too much space as a whole. In other embodiments, when the installation space permits, the columns can also be arranged in the middle.

[0037] Based on the above embodiment, in one embodiment, as Figures 1-4In the provided embodiment, bolt connection holes are provided in the middle of the front mounting column 1 and the rear mounting column 2 in the up-and-down direction. The bolt connection holes at this location constitute a switch fixing structure. The switch fixing structure is arranged on the front mounting column 1 and the rear mounting column 2. The switch module 16 bears the force by using the two side mounting columns. The operating mechanism of the switch module 16 extends from one side in the front-and-rear direction of either the front mounting column 1 or the rear mounting column 2. The mounting column and the door frame column 173 are staggered front and rear to facilitate operation. In other embodiments, multiple cross beams can also be provided, and the switch module is fixed by using two cross beams spaced up and down among them.

[0038] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, an upper sealing plate 10 and a lower sealing plate are further arranged between the front mounting column 1 and the rear mounting column 2. The upper sealing plate 10 is arranged above the switch mounting frame, and the lower sealing plate is arranged below the switch mounting frame. The space between the upper sealing plate 10 and the lower sealing plate constitutes a space for installing the switch module 16. The switch module 16 can pass through this space, with a part suspended on the left side of the switch mounting frame and a part suspended on the right side of the switch mounting frame. The switch fixing structure is arranged at the part of the front mounting column 1 and the rear mounting column 2 between the upper sealing plate 10 and the lower sealing plate. The high-voltage chamber 174 is divided into two spaces by the upper sealing plate 10 and the lower sealing plate, separating electrical components with different functions in the high-voltage chamber 174, improving the neatness of the electrical components inside the box-type substation and enhancing safety.

[0039] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, the lower sealing plate is a split structure, including a lower upper sealing plate 11 and a lower lower sealing plate 12 arranged separately. Compared with an integrally formed structure, small-sized profiles can be selected, and it is also convenient for fixed installation operations in a narrow space. In other embodiments, a large steel plate with an area equal to the total area of the lower upper sealing plate and the lower lower sealing plate can also be used as the lower sealing plate of the switch module.

[0040] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, the lower support 3 is fixed to the base of the main body framework by bolts. A plurality of bolt connection holes are arranged at intervals in the left-and-right direction on the base of the main body framework. The position of the switch mounting frame inside the main body framework is adjusted by fixing the lower support 3 in different bolt connection holes. The switch mounting frame and the main body framework are detachably connected, and the operation is simple. In other embodiments, if it is installed in place at one time and no longer moved, welding can also be used.

[0041] Based on the above embodiment, in one embodiment, as Figures 1-4In the provided embodiment, channel steel profiles are selected for the front mounting column 1 and the rear mounting column 2 of the present invention. The openings of the front mounting column 1 and the rear mounting column 2 face away from each other. A plurality of column reinforcing ribs 4 are added in the grooves of the front mounting column 1 and the rear mounting column 2 to strengthen the structural strength of the front mounting column 1 and the rear mounting column 2, thereby improving the overall structural strength of the switch mounting frame.

[0042] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, the upper crossbeam 13 is a channel steel profile. The front mounting column 1 and the rear mounting column 2 are inserted into the groove of the upper crossbeam 13. Connecting blocking plates extending downward along the two side walls of the upper crossbeam 13 are also welded in the groove of the upper crossbeam 13. Through holes are provided on the connecting blocking plates. Through holes corresponding to the through holes on the connecting blocking plates are provided on the two side walls of the channel steel profile of the front mounting column 1 and the rear mounting column 2. The connecting blocking plates are fixed to the front and rear mounting columns through bolts, and then the upper crossbeam 13 is fixed to the front and rear mounting columns. The structure is simple and the operation is convenient.

[0043] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, a lower crossbeam 8 is further provided on the switch mounting frame at a position close to the top of the lower sealing plate to connect the front and rear mounting columns horizontally, so as to strengthen the overall structural strength of the switch mounting frame.

[0044] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, an upper sealing plate reinforcing rib 15 is provided below the upper sealing plate 10. The upper sealing plate reinforcing rib 15 is formed by bending the bottom of the upper sealing plate 10 to strengthen the structural strength of the high-voltage upper sealing plate 10.

[0045] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, triangular reinforcing members 7 are provided on both the left and right sides of the connection between the lower support 3 and the corresponding front mounting column 1 and rear mounting column 2 to strengthen the structural strength of the connection part between the lower support 3 and the front and rear mounting columns, and prevent the switch mounting frame from tipping over due to damage to the connection part between the lower support 3 and the front and rear mounting columns.

[0046] Based on the above embodiment, in one embodiment, as Figures 1-4 In the provided embodiment, the lower support 3 is a channel steel profile. A lower support reinforcing rib is also welded in the groove of the lower support 3 to strengthen the structural strength of the lower support 3.

[0047] When assembling the box body, the following steps are included: Step 1: Position-weld the front mounting column 1 and the column reinforcing rib 4; Step 2: Position-weld the rear mounting column 2 and the column reinforcing rib 4; Step 3: Position-weld the upper crossbeam 13 and the connecting blanking plate; Step 4: Install the front mounting column 1 welded with the column stiffener 4 in Step 1 on the lower support 3 by bolts; Step 5: Install the rear mounting column 2 welded with the column stiffener 4 in Step 2 on the lower support 3 by bolts; Step 6: Install the lower crossbeam 8 between the front mounting column 1 and the rear mounting column 2 equipped with the lower support 3 by bolts, and fix the upper crossbeam 13 to the front mounting column 1 and the rear mounting column 2 through the connecting blanking plate to initially form the most basic switch mounting frame; Step 7: In the switch mounting frame formed by the assembly in Step 6, install the reinforcing diagonal brace 9 between the end of the lower support 3 extending relatively long with respect to the mounting column and the mounting column by bolts, and fixedly install the triangular reinforcing member 7 at the connection between the mounting column and the lower support 3 by bolts; Step 8: Fix and install the upper sealing plate 10, the lower upper sealing plate 11 and the lower lower sealing plate 12 between the front mounting column 1 and the rear mounting column 2 of the vertical frame structure equipped with the reinforcing diagonal brace 8 and the triangular reinforcing member 7 by bolts; Step 9: Lift the switch mounting frame installed with the upper sealing plate 10 and the lower sealing plate in Step 8 into the main skeleton of the box body of the box-type substation and fixedly install the switch mounting frame on the base of the box body of the box-type substation by bolts, and fix the upper crossbeam of the switch mounting frame to the corresponding top side beam by bolts; Step 10: Fix the switch module 16 between the upper sealing plate 10 and the lower sealing plate through the switch fixing structure on the front mounting column 1 and the rear mounting column 2.

[0048] Make the installation and replacement of high-voltage components more flexible, reduce the welding workload, shorten the time for the switch module to be assembled in the box body, reduce the assembly difficulty, and improve the production efficiency.

[0049] The present invention also provides an embodiment of a box-type substation: The box-type substation includes a box body and a switch module installed in the box body. The box body of the box-type substation in this embodiment is the same as the box body of the box-type substation provided in any of the above embodiments provided with an independent switch mounting frame, and will not be elaborated here.

[0050] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A box body of a box-type substation, characterized in that, The box body includes a main body skeleton and a switch mounting frame. The main body skeleton cooperates with side plates, a top cover and a door panel to enclose an inner cavity of the box body. The inner cavity of the box body has a switch mounting space. The switch mounting frame is provided with a switch fixing structure for fixedly mounting a switch module. The switch mounting frame includes two upright columns arranged at intervals front and rear, at least two cross beams connecting the two upright columns, and a lower support provided at the bottom of the upright columns. The main body skeleton has a top opening for the switch mounting frame to be hoisted into the switch mounting space when the top cover is not installed. The front and rear dimensions of the part of the switch mounting frame where the two upright columns are located are smaller than the front and rear dimensions of the switch mounting space. The lower support of the switch mounting frame is supported on the base of the main body skeleton and fixed.

2. The box body of the box-type substation according to claim 1, characterized in that, One of the cross beams is fixed to the tops of the two upright columns and this cross beam forms an upper cross beam. The length of the upper cross beam is greater than the front and rear dimensions of the part of the switch mounting frame where the two upright columns are located. The two ends of the upper cross beam are respectively detachably connected to two top side beams spaced front and rear at the top of the main body skeleton.

3. The box body of the box-type substation according to claim 2, characterized in that, The upper cross beam is provided with bolt connection holes for fixedly connecting with the top cover by bolts.

4. The box body of the box-type substation according to claim 1 or 2 or 3, characterized in that, The lower support extends in the left - right direction. The upright columns are fixed at a position on one end of the lower support biased in the left - right direction. A reinforcing diagonal brace is provided between the other end of the lower support in the left - right direction and the upright columns.

5. The casing of the box-type substation according to claim 1 or 2 or 3, characterized in that, The switch fixing structure is arranged on the upright columns.

6. The casing of the box-type substation according to claim 5, characterized in that An upper sealing plate and a lower sealing plate are further arranged between the two upright columns. A space for installing the switch module is formed between the upper sealing plate and the lower sealing plate. The switch fixing structure is arranged on the part of the upright columns between the upper sealing plate and the lower sealing plate.

7. The housing of the box-type substation according to claim 6, characterized in that, The lower sealing plate includes a separately arranged lower upper sealing plate and a lower lower sealing plate.

8. The box body of the box-type substation according to claim 1 or 2 or 3, characterized in that, The lower support is fixedly connected to the base of the main body skeleton by bolts. A plurality of bolt connection holes are arranged at intervals in the left - right direction on the base for the lower support to be able to connect to different bolt connection holes.

9. The casing of the box-type substation according to claim 1 or 2 or 3, characterized in that, The upright columns are channel steel profiles, and upright column reinforcing ribs are further arranged in the grooves of the upright columns.

10. A box-type substation, characterized in that, It includes a box body and a switch module installed in the box body. The box body is the box body of the box - type substation according to any one of claims 1 - 9.

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