Zero-sequence current transformer mounting structure and low-voltage cabinet

Abstract

The utility model provides a zero-sequence current transformer installation structure and a low-voltage cabinet, which belong to the technical field of low-voltage cabinets and comprise an installation beam and a transformer installation module. The mounting beam is vertically mounted on the inner wall of a side plate of the low-voltage cabinet; the mounting beam is located behind the vertical row cover plate, and a mounting space is formed between the mounting beam and the vertical row cover plate; the mutual inductor mounting module comprises a sliding module and a limiting module; the sliding module has the freedom degree of moving in the length direction of the mounting beam. The limiting module is arranged on the sliding module; and the plurality of zero sequence current transformers are respectively arranged on the plurality of limiting modules. According to the zero-sequence current transformer installation structure provided by the utility model, the installation beam is arranged on the side plate of the low-voltage cabinet, so that the zero-sequence current transformer is separated from the vertical row cover plate, the heat dissipation of the vertical row cover plate is not influenced, and a primary cable and a secondary cable can be effectively separated by virtue of the installation space between the installation beam and the vertical row cover plate; the construction is convenient.

Description

A zero-sequence current transformer mounting structure and low-voltage switchgear Technical Field

[0001] This utility model belongs to the field of low-voltage switchgear technology, specifically relating to a zero-sequence current transformer installation structure and a low-voltage switchgear. Background Technology

[0002] Zero-sequence current transformers in low-voltage cabinet drawers provide fire prevention and electrical protection. Currently, most zero-sequence current transformers in low-voltage cabinets are installed on the vertical cover plate at the back of the drawer. However, this installation method has the following disadvantages: the vertical cover plate and other electrical components are heat-generating parts; the cables passing through the zero-sequence current transformer to the drawer's main contacts result in messy primary and secondary wiring, hindering construction, affecting heat dissipation, and requiring the zero-sequence secondary wiring to be connected to a fire detector. This prevents clear separation between primary and secondary cables, impacting the safety and tidiness of the electrical room. Summary of the Invention

[0003] This utility model provides a zero-sequence current transformer mounting structure and low-voltage switchgear to solve the technical problems in the prior art where the zero-sequence current transformer is mounted on a vertical cover plate, which affects the heat dissipation of the vertical cover plate and other components and makes it inconvenient for the construction of primary and secondary cables.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a zero-sequence current transformer mounting structure, comprising:

[0005] The mounting beam is vertically installed on the inner wall of the side panel of the low-voltage switchgear; the mounting beam is located behind the vertical cover plate, and there is an installation space between the mounting beam and the vertical cover plate;

[0006] Multiple current transformer mounting modules are provided; these modules are arranged vertically and spaced parallel to each other on the mounting beam; each mounting module includes a sliding module and a limiting module; the sliding module has a degree of freedom to move along the length of the mounting beam; the limiting module is located on the sliding module and is used to restrict the movement of the sliding module; multiple zero-sequence current transformers are respectively located on the multiple limiting modules; a fire detector is fixed on the mounting beam and located below the zero-sequence current transformers.

[0007] In one possible implementation, the sliding module includes a sliding plate and two limiting plates; the sliding plate is slidably connected to the mounting beam; the limiting plates are provided with grooves, the two limiting plates are located on both sides of the sliding plate, and the two grooves are respectively slidably connected to the two side walls of the mounting beam; a zero-sequence current transformer is located on the sliding plate.

[0008] In one possible implementation, the mounting beam has multiple mounting holes arranged along the length of the mounting beam; the sliding plate has limiting holes corresponding to the mounting holes; the limiting module includes a limiting body, a limiting block, and an elastic element; the limiting body is fixed to the side of the mounting beam away from the sliding plate, and the limiting body has limiting grooves, with multiple limiting grooves corresponding one-to-one with multiple mounting holes; one end of the limiting block is disposed in the limiting groove and slidably connected to the limiting groove, and the other end extends out of the mounting hole; both ends of the elastic element are connected to the inner wall of the limiting groove and the limiting block, respectively.

[0009] In one possible implementation, the end of the limiting block away from the limiting groove is an arc-shaped head.

[0010] In one possible implementation, a mounting plate is provided between the zero-sequence current transformer and the slide plate, and the mounting plate has an opening on the side near the slide plate to avoid the limiting block.

[0011] In one possible implementation, the mounting plate is detachably connected to the skateboard.

[0012] In one possible implementation, the limiting plate is integrally formed with the sliding plate.

[0013] In one possible implementation, a fixed beam is provided on the side of the mounting beam away from the zero-sequence current transformer, and the two ends of the limiting body are respectively connected to the mounting beam and the fixed beam; the fixed beam is fixedly connected to the side plate of the low-voltage switchgear.

[0014] In one possible implementation, the fixed beam is provided with a plurality of wire holes; the plurality of wire holes are arranged vertically on the fixed beam.

[0015] The beneficial effects of the zero-sequence current transformer installation structure provided by this utility model are as follows: Compared with the prior art, in use, the installation beam of this utility model is vertically fixed to the inner wall of the side plate of the low-voltage switchgear, and an installation space is reserved between the installation beam and the vertical cover plate; at the same time, multiple transformer installation modules are installed on the installation beam, ensuring that the sliding module of each transformer installation module is in a free sliding state, and the limiting module does not restrict its movement. According to the cable routing in the low-voltage switchgear and the actual monitoring position, the limiting module with the zero-sequence current transformer is moved along the length of the installation beam through the sliding module to find a suitable installation position. The cable to be monitored is passed through the center hole of the zero-sequence current transformer. Since the position of the transformer installation module has been adjusted, the cable can pass smoothly through the zero-sequence current transformer, ensuring that the cable is in the center position of the zero-sequence current transformer, so as to ensure that the zero-sequence current transformer can accurately detect the zero-sequence current of the cable. After the cable is successfully threaded through the zero-sequence current transformer, the limit module is activated to restrict the movement of the sliding module, thus fixing the zero-sequence current transformer in its current position. This ensures that the zero-sequence current transformer will not shift during subsequent operation, guaranteeing monitoring accuracy. Simultaneously, the fire detector is fixed to the mounting beam as required, located below the zero-sequence current transformer. This method of placing the mounting beam on the side panel of the low-voltage cabinet isolates the zero-sequence current transformer from the vertical cover plate, preserving its heat dissipation. The installation space between the mounting beam and the vertical cover plate also effectively isolates the primary and secondary cables, facilitating construction and resulting in a neat and aesthetically pleasing cabinet interior for future maintenance. Positioning the fire detector below the zero-sequence current transformer facilitates current acquisition wiring between the transformer and the detector, standardizing the wiring harness. Furthermore, the sliding module design of the transformer mounting module allows for flexible adjustment of the zero-sequence current transformer's position during cable installation, eliminating the need for precise pre-installation positioning and significantly improving installation efficiency. When it is necessary to replace the zero-sequence current transformer, simply release the limit module from the sliding module and slide the transformer mounting module to an easy-to-operate position for replacement. This eliminates the need for large-scale disassembly of the entire low-voltage cabinet structure, reducing maintenance costs and time.

[0016] Another objective of this utility model is to provide a low-voltage switchgear, including any of the above-mentioned zero-sequence current transformer mounting structures.

[0017] The low-voltage switchgear provided by this utility model isolates the zero-sequence current transformer from the vertical cover plate by placing the mounting beam on the side plate, thus not affecting the heat dissipation of the vertical cover plate. The installation space between the mounting beam and the vertical cover plate also effectively isolates the primary and secondary cables, facilitating construction. After construction, the interior of the low-voltage switchgear is neat and aesthetically pleasing, facilitating future maintenance. The fire detector is placed below the zero-sequence current transformer, facilitating current acquisition wiring between the zero-sequence current transformer and the fire detector, and standardizing the wiring harness. Furthermore, the sliding module design of the transformer mounting module allows for flexible adjustment of the zero-sequence current transformer's position during cable installation, eliminating the need for precise pre-installation positioning and significantly improving installation efficiency. When replacing the zero-sequence current transformer, simply release the limiting module from the sliding module, slide the transformer mounting module to an easily accessible position, and replace it without extensive disassembly of the entire low-voltage switchgear structure, reducing maintenance costs and time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the connection between the installation structure and the low-voltage switchgear provided in this embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the connection between the installation structure and the low-voltage switchgear provided in the embodiment of this utility model;

[0021] Figure 3 is a schematic diagram of the connection between the mounting beam and the current transformer mounting module provided in an embodiment of this utility model.

[0022] Figure 4 is a schematic diagram of the connection between the mounting beam and the current transformer mounting module provided in the embodiment of this utility model.

[0023] Figure 5 is a schematic diagram of the current transformer installation module provided in an embodiment of this utility model.

[0024] Figure 6 is a schematic diagram of the structure of the current transformer installation module provided in this embodiment of the present invention.

[0025] The following are the labeling elements in the figure:

[0026] 1. Mounting beam; 11. Mounting space; 12. Mounting hole; 2. Current transformer mounting module; 21. Sliding module; 211. Slide plate; 212. Limiting plate; 213. Slide groove; 214. Limiting hole; 215. Threaded hole; 22. Limiting module; 221. Limiting body; 222. Limiting block; 223. Elastic element; 224. Limiting groove; 225. Arc head; 3. Low-voltage cabinet; 31. Vertical row cover plate; 4. Zero-sequence current transformer; 5. Fire detector; 6. Mounting plate; 61. Circumvention opening; 62. Through hole; 63. Bolt; 7. Fixing beam; 71. Wiring hole. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] Please refer to Figures 1 to 6. The zero-sequence current transformer installation structure provided by this utility model will now be described. A zero-sequence current transformer installation structure includes a mounting beam 1 and transformer installation modules 2. The mounting beam 1 is vertically installed on the inner wall of the side plate of the low-voltage switchgear 3. The mounting beam 1 is located behind the vertical cover plate 31, and an installation space 11 is provided between the mounting beam 1 and the vertical cover plate 31. There are multiple transformer installation modules 2. The multiple transformer installation modules 2 are arranged vertically and are parallel and spaced on the mounting beam 1. The transformer installation module 2 includes a sliding module 21 and a limiting module 22. The sliding module 21 has a degree of freedom to move along the length direction of the mounting beam 1. The limiting module 22 is provided on the sliding module 21 and is used to limit the movement of the sliding module 21. Multiple zero-sequence current transformers 4 are respectively provided on the multiple limiting modules 22. A fire detector 5 is fixed on the mounting beam 1 and located below the zero-sequence current transformers 4.

[0032] Compared with the prior art, the zero-sequence current transformer installation structure provided in this embodiment, during use, involves vertically fixing the mounting beam 1 to the inner wall of the side plate of the low-voltage switchgear 3, with an installation space 11 reserved between the mounting beam 1 and the vertical cover plate 31; simultaneously, multiple transformer installation modules 2 are installed on the mounting beam 1, ensuring that the sliding module 21 of each transformer installation module 2 is in a free sliding state, and the limiting module 22 does not restrict its movement. Based on the cable routing within the low-voltage switchgear 3 and the actual monitoring location, the limiting module 22 with the zero-sequence current transformer 4 is moved along the length of the mounting beam 1 via the sliding module 21 to find a suitable installation position. The cable to be monitored passes through the central hole of the zero-sequence current transformer 4. Since the position of the transformer installation module 2 has been adjusted, the cable can smoothly pass through the zero-sequence current transformer 4, ensuring that the cable is in the center position of the zero-sequence current transformer 4, thus ensuring that the zero-sequence current transformer 4 can accurately detect the zero-sequence current of the cable. After the cable is successfully inserted into the zero-sequence current transformer 4, the limit module 22 is activated to restrict the movement of the sliding module 21, thereby fixing the zero-sequence current transformer 4 in its current position. This ensures that the zero-sequence current transformer 4 will not shift during subsequent operation, guaranteeing the accuracy of monitoring. Simultaneously, the fire detector 5 is fixed to the mounting beam 1 as required, located below the zero-sequence current transformer 4. In this way, the mounting beam 1 is placed on the side plate of the low-voltage cabinet 3, isolating the zero-sequence current transformer 4 from the vertical cover plate 31, without affecting the heat dissipation of the vertical cover plate 31. The installation space 11 between the mounting beam 1 and the vertical cover plate 31 also effectively isolates the primary and secondary cables, facilitating construction and resulting in a neat and aesthetically pleasing interior for future maintenance. Placing the fire detector 5 below the zero-sequence current transformer 4 facilitates current acquisition wiring between the zero-sequence current transformer 4 and the fire detector 5, standardizing the wiring harness. Meanwhile, the sliding module 21 design of the transformer mounting module 2 allows for flexible adjustment of the position of the zero-sequence current transformer 4 during cable installation, eliminating the need to precisely determine its fixed position before installation and significantly improving installation efficiency. When the zero-sequence current transformer 4 needs replacement, simply release the restriction of the limiting module 22 on the sliding module 21, slide the transformer mounting module 2 to an easily operable position, and the replacement can be performed without large-scale disassembly of the entire low-voltage switchgear 3, reducing maintenance costs and time.

[0033] Please refer to Figures 3 to 6. As a specific embodiment of the zero-sequence current transformer installation structure provided by this utility model, the sliding module 21 includes a sliding plate 211 and two limiting plates 212. The sliding plate 211 is slidably connected to the mounting beam 1. The limiting plates 212 have grooves 213, and the two limiting plates 212 are located on both sides of the sliding plate 211, with the two grooves 213 respectively slidably connected to the two side walls of the mounting beam 1. The zero-sequence current transformer 4 is mounted on the sliding plate 211. With the help of the sliding plate 211 and the two limiting plates 212, the zero-sequence current transformer 4 can move flexibly along the length of the mounting beam 1. This allows for convenient adjustment of the position of the zero-sequence current transformer 4 according to the actual cable routing and specific monitoring requirements within the low-voltage switchgear 3, ensuring accurate monitoring of the zero-sequence current of the target cable, and improving the flexibility and adaptability of the installation. The sliding grooves 213 of the two limiting plates 212 are slidably connected to the two side walls of the mounting beam 1. This not only provides guidance for the sliding of the slide plate 211, ensuring that the slide plate 211 can only move along the length of the mounting beam 1 without swaying or deviating, but also provides stable limiting for the slide plate 211 and the zero-sequence current transformer 4 during installation and use, preventing accidental displacement due to external forces or other factors, thereby ensuring the accuracy and stability of the monitoring position of the zero-sequence current transformer 4.

[0034] Please refer to Figures 3 to 6. As a specific embodiment of the zero-sequence current transformer mounting structure provided by this utility model, the mounting beam 1 has multiple mounting holes 12 arranged along the length of the mounting beam 1; the sliding plate 211 has limiting holes 214 corresponding to the mounting holes 12; the limiting module 22 includes a limiting body 221, a limiting block 222, and an elastic element 223; the limiting body 221 is fixed to the side of the mounting beam 1 away from the sliding plate 211, and the limiting body 221 has... A limiting groove 224 is provided, with multiple limiting grooves 224 corresponding one-to-one with multiple mounting holes 12. A limiting block 222 is located at one end inside the limiting groove 224 and is slidably connected to the limiting groove 224, while the other end extends out of the mounting hole 12. The elastic element 223 is connected at both ends to the inner wall of the limiting groove 224 and the limiting block 222, respectively. Multiple mounting holes 12 are arranged along the length of the mounting beam 1, and the sliding plate 211 is provided with corresponding limiting holes 214. The limiting block 222 can cooperate with the limiting hole 214 through the mounting hole 12. When it is necessary to fix the sliding plate 211 and the zero-sequence current transformer 4, the limiting block 222 extends out of the mounting hole 12 and inserts into the limiting hole 214 under the action of the elastic element 223, which can accurately fix the sliding plate 211 at a specific position on the mounting beam 1, ensuring that the zero-sequence current transformer 4 is in an accurate monitoring position. When the position of the zero-sequence current transformer 4 needs to be adjusted, simply overcome the elastic force of the elastic element 223 to press the limiting block 222 into the limiting groove 224, causing the limiting block 222 to disengage from the limiting hole 214. The sliding plate 211 can then slide along the mounting beam 1. After finding the appropriate position, release the limiting block 222, allowing it to automatically engage with the corresponding limiting hole 214 under the action of the elastic element 223. This achieves quick adjustment and re-fixation, making the operation convenient and fast, and improving the efficiency of the installation and commissioning of the zero-sequence current transformer 4. Optionally, the elastic element 223 is a spring.

[0035] Please refer to Figures 5 and 6. As a specific embodiment of the zero-sequence current transformer mounting structure provided by this utility model, the end of the limiting block 222 furthest from the limiting groove 224 is an arc-shaped head 225. The design of the arc-shaped head 225 makes it easier for the limiting block 222 to align with the limiting hole 214 on the sliding plate 211. When the sliding plate 211 approaches the mounting beam 1, the arc-shaped head 225 guides the limiting block 222 to smoothly insert into the limiting hole 214, reducing insertion difficulties caused by positional deviations and improving the convenience and efficiency of installation. During insertion and removal from the limiting hole 214, the contact area between the arc-shaped head 225 and the limiting hole 214 is relatively small, and the contact method is relatively smooth, effectively reducing the friction between them and reducing wear on the edges of the limiting block 222 and the limiting hole 214. This extends the service life of the limiting block 222 and the sliding plate 211, and also ensures the reliability of the limiting module 22.

[0036] Please refer to Figures 5 and 6. As a specific embodiment of the zero-sequence current transformer mounting structure provided by this utility model, a mounting plate 6 is provided between the zero-sequence current transformer 4 and the slide plate 211. The mounting plate 6 has a clearance opening 61 on the side near the slide plate 211 to avoid the limiting block 222. The mounting plate 6 provides a stable mounting platform for the zero-sequence current transformer 4, allowing it to be more firmly fixed to the slide plate 211. By mounting the zero-sequence current transformer 4 on the mounting plate 6 and then connecting the mounting plate 6 to the slide plate 211, the weight of the zero-sequence current transformer 4 can be distributed, avoiding excessive local stress that might occur if the zero-sequence current transformer 4 is directly connected to the slide plate 211, thereby improving the stability and reliability of the entire mounting structure. The clearance opening 61 on the mounting plate 6 avoids the limiting block 222, ensuring that the limiting block 222 works normally between the mounting hole 12 of the mounting beam 1 and the limiting hole 214 of the slide plate 211, without being obstructed by the mounting plate 6. When the sliding plate 211 is limited and fixed by the limiting block 222, the insertion and removal of the limiting block 222 will not be affected by the presence of the mounting plate 6, ensuring the normal function of the limiting module 22, so that the sliding plate 211 can be accurately fixed at a specific position on the mounting beam 1 when needed.

[0037] Please refer to Figure 6. As a specific embodiment of the zero-sequence current transformer mounting structure provided by this utility model, the mounting plate 6 and the sliding plate 211 are detachably connected. When the zero-sequence current transformer 4 malfunctions or requires regular maintenance, the mounting plate 6 can be easily removed from the sliding plate 211, and the zero-sequence current transformer 4 can be removed for inspection or replacement. This eliminates the need for large-scale disassembly of the entire mounting structure, reducing maintenance workload and time, and improving maintenance efficiency. The mounting plate 6 has a through hole 62, and the sliding plate 211 has a threaded hole 215. A bolt 63 passes through the through hole 62 and is threaded into the threaded hole 215, thereby fixing the mounting plate 6 to the sliding plate 211.

[0038] Please refer to Figures 5 and 6. As a specific embodiment of the zero-sequence current transformer installation structure provided by this utility model, the limiting plate 212 and the sliding plate 211 are integrally formed. The integrally formed structure eliminates the connection gap between the limiting plate 212 and the sliding plate 211, making the two a whole, thereby improving the structural strength and stability of the entire sliding module 21, ensuring that the sliding module 21 can work reliably during long-term use, and is not prone to deformation or breakage.

[0039] Please refer to Figures 2, 4, and 5. As a specific embodiment of the zero-sequence current transformer mounting structure provided by this utility model, a fixed beam 7 is provided on the side of the mounting beam 1 away from the zero-sequence current transformer 4. The two ends of the limiting body 221 are respectively connected to the mounting beam 1 and the fixed beam 7. The fixed beam 7 is fixedly connected to the side plate of the low-voltage switchgear 3. The fixed beam 7 and the side plate of the low-voltage switchgear 3 provide a clear installation reference for the entire mounting structure. The mounting beam 1 and the fixed beam 7 are connected by the limiting body 221, forming a stable frame structure.

[0040] Please refer to Figures 2, 4, and 5. As a specific embodiment of the zero-sequence current transformer installation structure provided by this utility model, the fixed beam 7 is provided with multiple through holes 71. These through holes 71 are arranged vertically on the fixed beam 7. The through holes 71 provide a dedicated channel for the connection wires of devices such as the zero-sequence current transformer 4, making the wiring neater and more standardized. The vertically arranged through holes 71 allow cables to be arranged orderly along the vertical direction of the fixed beam 7, avoiding messy tangling of cables, facilitating the identification and management of different cables, and improving the neatness and aesthetics of the wiring inside the low-voltage cabinet 3.

[0041] Please refer to Figures 1 and 2. Another objective of this utility model is to provide a low-voltage switchgear 3, which includes any of the zero-sequence current transformer mounting structures described above.

[0042] The low-voltage switchgear 3 provided by this utility model isolates the zero-sequence current transformer 4 from the vertical cover plate 31 by placing the mounting beam 1 on the side plate of the low-voltage switchgear 3, thus not affecting the heat dissipation of the vertical cover plate 31. Furthermore, the installation space 11 between the mounting beam 1 and the vertical cover plate 31 effectively isolates the primary and secondary cables, facilitating construction. After construction, the interior of the low-voltage switchgear 3 is neat and aesthetically pleasing, making future maintenance easier. The fire detector 5 is placed below the zero-sequence current transformer 4, facilitating current acquisition wiring between the zero-sequence current transformer 4 and the fire detector 5, and standardizing the wiring harness. Simultaneously, the sliding module 21 design of the transformer installation module 2 allows for flexible adjustment of the position of the zero-sequence current transformer 4 during cable installation, eliminating the need to precisely determine its fixed position before installation, greatly improving installation efficiency. When it is necessary to replace the zero-sequence current transformer 4, simply release the restriction of the limit module 22 on the sliding module 21, slide the transformer mounting module 2 to an easy-to-operate position, and the replacement can be carried out without the need for large-scale disassembly of the entire low-voltage cabinet 3, thus reducing maintenance costs and time.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A zero-sequence current transformer mounting structure, characterized in that, The device includes: a mounting beam, vertically installed on the inner wall of the side panel of the low-voltage switchgear; the mounting beam is located behind the vertical cover plate, and an installation space is provided between the mounting beam and the vertical cover plate; multiple current transformer mounting modules; the multiple current transformer mounting modules are vertically arranged and parallel to each other on the mounting beam; each current transformer mounting module includes a sliding module and a limiting module; the sliding module has a degree of freedom to move along the length direction of the mounting beam; the limiting module is disposed on the sliding module and is used to restrict the movement of the sliding module; multiple zero-sequence current transformers are respectively disposed on the multiple limiting modules; and a fire detector is fixed on the mounting beam and located below the zero-sequence current transformers.

2. The zero-sequence current transformer mounting structure as described in claim 1, characterized in that, The sliding module includes a sliding plate and two limiting plates; the sliding plate is slidably connected to the mounting beam; the limiting plates are provided with sliding grooves, the two limiting plates are located on both sides of the sliding plate, and the two sliding grooves are respectively slidably connected to the two side walls of the mounting beam; a zero-sequence current transformer is located on the sliding plate.

3. The zero-sequence current transformer mounting structure as described in claim 2, characterized in that, The mounting beam has multiple mounting holes arranged along its length. The sliding plate has corresponding limiting holes. The limiting module includes a limiting body, a limiting block, and an elastic element. The limiting body is fixed to the side of the mounting beam away from the sliding plate, and has limiting grooves that correspond one-to-one with the mounting holes. One end of the limiting block is located in the limiting groove and is slidably connected to it, while the other end extends out of the mounting hole. Both ends of the elastic element are connected to the inner wall of the limiting groove and the limiting block, respectively.

4. The zero-sequence current transformer mounting structure as described in claim 3, characterized in that, The end of the limiting block away from the limiting groove has an arc-shaped head.

5. The zero-sequence current transformer mounting structure as described in claim 3, characterized in that, A mounting plate is provided between the zero-sequence current transformer and the slide plate, and the mounting plate has an opening on the side near the slide plate to avoid the limiting block.

6. The zero-sequence current transformer mounting structure as described in claim 5, characterized in that, The mounting plate is detachably connected to the sliding plate.

7. The zero-sequence current transformer mounting structure as described in claim 2, characterized in that, The limiting plate and the sliding plate are integrally formed.

8. The zero-sequence current transformer mounting structure as described in claim 3, characterized in that, A fixed beam is provided on the side of the mounting beam away from the zero-sequence current transformer, and the two ends of the limiting body are respectively connected to the mounting beam and the fixed beam; the fixed beam is fixedly connected to the side plate of the low-voltage switchgear.

9. The zero-sequence current transformer mounting structure as described in claim 8, characterized in that, The fixed beam is provided with multiple wire holes; the multiple wire holes are arranged vertically on the fixed beam.

10. A low-voltage switchgear, characterized in that, Including a zero-sequence current transformer mounting structure as described in any one of claims 1-9.

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