A low-voltage busbar cabinet of a box-type substation

Abstract

This invention relates to the field of electrical cabinet technology, and particularly to a prefabricated low-voltage combiner cabinet for substations, comprising a cabinet body and circuit breakers. The cabinet body has a distribution chamber, within which a first partition plate forms a switch compartment with the front panel of the cabinet body. The distribution chamber also has a second partition plate, separating a branch combiner compartment and a cable compartment on the left and right sides of the rear of the switch compartment. The first partition plate includes a first partition sub-plate, a partition mother plate, and a second partition sub-plate arranged sequentially in a left-right direction. The first partition sub-plate cooperates with the partition mother plate to separate the branch combiner compartment and the switch compartment; the second partition sub-plate cooperates with the partition mother plate to separate the switch compartment and the cable compartment. The incoming line connector of each circuit breaker passes through the space between the first partition sub-plate and the partition mother plate into the branch combiner compartment; the outgoing line connector of each circuit breaker passes through the space between the second partition sub-plate and the partition mother plate into the cable compartment. This design satisfies both the high isolation requirements and facilitates the installation of the circuit breaker connectors.

Description

Technical Field

[0001] This invention relates to the field of electrical cabinet technology, and in particular to a box-type low-voltage combiner cabinet for substations. Background Technology

[0002] For overseas prefabricated substations, due to the need to meet shipping requirements, they are usually made into 20HC containers. Therefore, the low-voltage combiner cabinets in string-type prefabricated substations need to be as compact as possible, and as many switching circuits as possible need to be added within the limited space.

[0003] In the prior art, such as the box-type substation and photovoltaic system disclosed in patent document CN120033541A, all circuit breakers in the combiner cabinet are vertically installed and distributed in two rows, one above the other. Both the upper and lower circuit breakers have their own vertical ends with outgoing lines. At the same time, the upper combiner chamber and the lower cable chamber are separated by a horizontal partition on the rear side of the lower circuit breaker. The lower connecting bars of the upper and lower circuit breakers need to extend into the cable chamber to connect with the external cables.

[0004] However, since both the upper and lower circuit breakers have their cables routed from their vertical ends, the lower connecting bars of the upper circuit breaker and the upper connecting bars of the lower circuit breaker run between the two rows of circuit breakers. This results in densely packed connecting bars, which can easily become confusing or interfere with each other, making installation and replacement of the connecting bars inconvenient. Furthermore, the backplates on the rear sides of each circuit breaker have large gaps on the upper and lower sides for the three-phase connecting bars, meaning the space where the circuit breakers are located is not completely separated from the space where the busbars are located. Moreover, the lower connecting bars of the upper circuit breakers need to extend downwards into the cable room from the space where the rear busbars are located, failing to meet the design requirements for a high degree of isolation. Summary of the Invention

[0005] The main objective of this invention is to provide a box-type low-voltage combiner cabinet for substations that can meet the design requirements of high isolation and facilitate the installation of circuit breaker connection bars.

[0006] To achieve the above objectives, the present invention proposes a prefabricated substation low-voltage combiner cabinet, comprising a cabinet body and a circuit breaker; the cabinet body has a power distribution chamber, and a first partition plate is provided in the power distribution chamber to form a switch chamber between the first partition plate and the front panel of the cabinet body; a second partition plate is provided on the rear side of the power distribution chamber to separate a branch combiner chamber and a cable chamber on the left and right sides of the rear side of the switch chamber; the first partition plate includes a first partition sub-plate, a partition mother plate and a second partition sub-plate arranged sequentially in the left-right direction; the partition mother plate is connected to the cabinet body and is located on the front side of the second partition plate; both the first partition sub-plate and the second partition sub-plate are detachably connected to the cabinet body; the first partition sub-plate cooperates with the partition mother plate to separate the branch combiner chamber and the switch chamber; the second partition sub-plate cooperates with the partition mother plate to separate the switch chamber and the cable chamber; Several circuit breakers are arranged laterally on the front surface of the partition mother plate and along the height direction; the incoming line connection of each circuit breaker passes through the branch junction box from between the first partition sub-plate and the partition mother plate; the outgoing line connection of each circuit breaker passes through the cable compartment from between the second partition sub-plate and the partition mother plate.

[0007] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, a first splicing gap is formed between the first partition sub-plate and the partition mother plate, and a second splicing gap is formed between the second partition sub-plate and the partition mother plate.

[0008] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, a group of first through holes for incoming line connectors to pass through is formed between the first partition subplate and the partition mother plate, and a group of second through holes for outgoing line connectors to pass through is formed between the second partition subplate and the partition mother plate.

[0009] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, the branch combiner chamber is provided with three branch combiner connection bars, which are arranged on the same plane and distributed at intervals in the front-to-back direction; the thickness direction of each branch combiner connection bar is consistent with the left-to-right direction; each first through-hole group includes three incoming through-holes arranged at intervals in the height direction; in the first through-hole group, the three incoming through-holes correspond one-to-one with the incoming connect bars of the three phases of the same circuit breaker; the incoming connect bars of the three phases of the same circuit breaker pass through the corresponding incoming through-holes and connect to the branch combiner connection bars of the corresponding phases.

[0010] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, in the first through-hole group, two incoming through-holes are set flush with each other in the horizontal direction, and another incoming through-hole protrudes in the horizontal direction relative to the two flush incoming through-holes, so as to be close to the branch busbar located on the front side.

[0011] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, each of the second through-hole groups includes three outgoing through-holes spaced apart in the vertical direction. Within the second through-hole, the three outgoing through-holes correspond one-to-one with the outgoing connection bars of the same circuit breaker. The inside of the cable compartment is provided with a fixing seat that matches the outgoing through-holes one-to-one. The outgoing connection bars of the same circuit breaker pass through the corresponding outgoing through-holes and are fixedly connected to the fixing seat.

[0012] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, three fixed seats connected to the same circuit breaker form a group. The three fixed seats in the same group are arranged at intervals along the left and right directions, and the height of the three fixed seats in the same group is consistent with the height of the corresponding outgoing through hole. The three fixed seats in each group are arranged in the same order in the left and right directions.

[0013] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, the two fixed seats in the same row of adjacent groups are staggered in the vertical direction.

[0014] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, the cable compartment is provided with an insulating fixing plate, the insulating fixing plate is spaced apart from the first partition plate, the fixing seat is provided on the back of the insulating fixing plate, and the insulating fixing plate is provided with a clearance hole for the outgoing line connection to pass through.

[0015] In the aforementioned low-voltage combiner cabinet of the prefabricated substation, the front panel of the cabinet is provided with a front connecting opening for connecting to the switch compartment, and the rear panel of the cabinet is provided with a rear connecting opening for connecting to the cable compartment. The front connecting opening and the rear connecting opening are respectively provided with a cover plate that can be detachably connected to the cabinet.

[0016] The technical solution provided by this invention may include the following beneficial effects: In the low-voltage combiner cabinet provided in this application, the branch combiner compartment, the switch compartment, and the cable compartment are independently isolated from each other. The incoming line connection bars of each circuit breaker can directly enter the branch combiner compartment from the switch compartment, and the outgoing line connection bars of each circuit breaker can directly enter the cable compartment from the switch compartment. Compared with existing combiner cabinets, this application eliminates the need for outgoing line connection bars to enter the branch combiner compartment and then extend to the cable compartment, thus meeting the design requirements for a high degree of isolation.

[0017] The first partition plate is composed of a first partition sub-plate, a partition mother plate, and a second partition sub-plate, which facilitates the assembly of multiple incoming line connection bars and outgoing line connection bars. When it is necessary to inspect or replace the incoming line connection bars and outgoing line connection bars, the first partition sub-plate and the second partition sub-plate can be removed, which improves the convenience of inspection and maintenance.

[0018] It is worth noting that in this application, the circuit breakers are all horizontally mounted on the front surface of the partition panel and arranged along the height direction. This allows all incoming line connection bars to be located on the side of the circuit breaker closer to the branch junction box, and all outgoing line connection bars to be located on the side of the circuit breaker closer to the cable compartment. This ensures that the incoming and outgoing line connection bars are distributed on opposite sides of the circuit breaker, reducing wiring confusion and facilitating installation by on-site personnel. Furthermore, all incoming and outgoing line connection bars are also arranged along the height direction for a rational distribution, effectively preventing the connection bars from being concentrated at the bottom of the cabinet, thus eliminating the need for on-site personnel to squat for extended periods while wiring. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the low-voltage combiner cabinet of the prefabricated substation of the present invention; Figure 2 This is a schematic diagram of the power distribution chamber of the present invention; Figure 3 This is a schematic diagram of the structure of the first partition plate of the present invention; Figure 4 for Figure 3 An enlarged schematic diagram of region A in the embodiment; Figure 5 This is an exploded structural diagram of the first partition plate of the present invention; Figure 6 This is a schematic diagram of the internal structure of the low-voltage combiner cabinet of the box-type substation of the present invention; Figure 7 This is a schematic diagram showing the connection of the incoming line connection bar and the outgoing line connection bar of the circuit breaker of the present invention; Figure 8 This is a schematic diagram showing the fit between the front side of the cabinet and the cover plate of the present invention; Figure 9 This is a schematic diagram showing the fit between the rear side of the cabinet and the front cover of the present invention; In the attached diagram: 100 - Cabinet, 110 - Distribution Chamber, 111 - First Partition Plate, 1111 - First Sub-Partition Plate, 1112 - Main Partition Plate, 1113 - Second Sub-Partition Plate, 1114 - First Joint Gap, 1115 - Second Joint Gap, 1116 - First Through-Hole Group, 11161 - Inlet Through-Hole, 11162 - First Notch, 11163 - Second Notch, 1117 - Second Through-Hole Group, 11171 - Outlet Through-Hole, 11172 - Third Notch, 11173 - ... Four notches, 112-Switch room, 113-Second partition plate, 114-Branch busbar room, 115-Cable room, 1151-Fixed base, 1152-Insulation fixing plate, 1153-Avoidance hole, 120-Front connection opening, 130-Rear connection opening, 140-Eaves, 150-Face cover plate, 151-Operating window, 152-Hook slot, 200-Circuit breaker, 210-Incoming line connection bar, 220-Outgoing line connection bar, 300-Main busbar connection bar, 400-Branch busbar connection bar. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Furthermore, in this invention, descriptions involving "first," "second," etc., 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 word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. 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 invention.

[0025] The following description, with reference to the accompanying drawings, describes a low-voltage combiner cabinet for a prefabricated substation according to an embodiment of the present invention. The cabinet includes a cabinet 100 and a circuit breaker 200, wherein the cabinet 100 is provided with a power distribution chamber 110. In this application, the cabinet 100 may be provided with multiple power distribution chambers 110, such as… Figure 2 As shown, three power distribution chambers 110 can be set along the length of the cabinet 100.

[0026] Each of the power distribution chambers 110 is provided with a first partition plate 111 to form a switch chamber 112 between it and the front panel of the cabinet 100. The power distribution chamber 110 is provided with a second partition plate 113 on the rear side of the first partition plate 111 to separate the branch junction chamber 114 and the cable chamber 115 on the left and right sides of the rear side of the switch chamber 112. In this way, the branch junction chamber 114, the switch chamber 112 and the cable chamber 115 are isolated from each other.

[0027] like Figure 3 As shown, the first partition plate 111 includes a first partition sub-plate 1111, a partition mother plate 1112, and a second partition sub-plate 1113 arranged sequentially in the left-right direction. The partition mother plate 1112 is connected to the cabinet 100 and is disposed on the front side of the second partition plate 113. Both the first partition sub-plate 1111 and the second partition sub-plate 1113 are detachably connected to the cabinet 100. The first partition sub-plate 1111 cooperates with the partition mother plate 1112 to separate the branch junction chamber 114 and the switch chamber 112. The second partition sub-plate 1113 cooperates with the partition mother plate 1112 to separate the switch chamber 112 and the cable chamber 115. Specifically, the two side edges of the partition mother plate 1112 are spaced apart from the left and right side walls of the power distribution chamber 110 to form an opening that can connect the branch junction chamber 114 and the cable chamber 115. The opening is filled by the first partition plate 1111 and the second partition plate 1113 to separate the switch chamber 112 from the branch junction chamber 114 and the cable chamber 115.

[0028] Furthermore, several circuit breakers 200 are arranged laterally on the front surface of the partition mother plate 1112 and along the height direction; the incoming line connection bar 210 of each circuit breaker 200 passes through the branch junction box 114 from between the first partition sub-plate 1111 and the partition mother plate 1112; the outgoing line connection bar 220 of each circuit breaker 200 passes through the cable compartment 115 from between the second partition sub-plate 1113 and the partition mother plate 1112. Specifically, as... Figure 2 As shown, the incoming terminal of the circuit breaker 200 is located at the end of its length direction near the branch busbar 114, and the outgoing terminal of the circuit breaker 200 is also located at the end of its length direction near the branch busbar 114. The incoming terminal of the circuit breaker 200 is connected to the branch busbar 400 via the incoming connection busbar 210. The outgoing terminal of the circuit breaker 200 is connected to an external cable via the outgoing connection busbar 220. It is worth noting that in the embodiments of this application, as... Figure 6 As shown, the cabinet 100 is equipped with a main busbar 300, and each branch busbar 114 in the distribution chamber 110 is equipped with a branch busbar 400. The top of the branch busbar 400 is connected to the main busbar 300. In a preferred embodiment, top partition plates can be provided on the top of the switch chamber 112 and the top of the cable chamber 115 to separate the circuit breaker 200 and external cables from the main busbar 300.

[0029] In the low-voltage combiner cabinet provided in this application, the branch combiner compartment 114, the switch compartment 112, and the cable compartment 115 are isolated from each other. The incoming line connectors 210 of each circuit breaker 200 can directly enter the branch combiner compartment 114 from the switch compartment 112, and the outgoing line connectors 220 of each circuit breaker 200 can directly enter the cable compartment 115 from the switch compartment 112. Compared with existing combiner cabinets, this application eliminates the need for the outgoing line connectors 220 to enter the branch combiner compartment 114 and then extend to the cable compartment 115, thus meeting the design requirements for a high degree of isolation.

[0030] Furthermore, the first partition plate 111 is constructed by splicing together a first partition sub-plate 1111, a partition mother plate 1112, and a second partition sub-plate 1113 to facilitate the assembly of multiple incoming line connection blocks 210 and outgoing line connection blocks 220. Specifically, when assembling the circuit breaker 200 in the combiner cabinet, multiple circuit breakers 200 are first fixed in an arranged manner on the surface of the partition mother plate 1112. Since the first partition sub-plate 1111 is not installed, an opening is formed between the partition mother plate 1112 and the side wall of the distribution chamber 110, connecting the branch combiner chamber 114, so that the incoming line connection blocks 210 can connect the branch combiner connection blocks 400 and the incoming terminals of the circuit breakers 200. Similarly, since the second partition sub-plate 1113 is not installed, an opening is formed between the partition mother plate 1112 and the side wall of the distribution chamber 110, connecting the cable chamber 115, so that the outgoing line connection blocks 220 can connect the external cables and the outgoing terminals of the circuit breakers 200. After all incoming line connectors 210 and outgoing line connectors 220 are installed, the first partition panel 1111 and the second partition panel 1113 are then installed to isolate the switch compartment 112 from the branch junction compartment 114 and the cable compartment 115, thus meeting the isolation requirements of the junction box. When it is necessary to inspect or replace the incoming line connectors 210 and outgoing line connectors 220, the first partition panel 1111 and the second partition panel 1113 can be removed, improving the convenience of maintenance.

[0031] It is worth noting that in this application, all circuit breakers 200 are horizontally arranged on the front surface of the partition panel 1112 and arranged along the height direction. This allows all incoming line connection bars 210 to be located on the side of the circuit breaker 200 near the branch junction box 114, and all outgoing line connection bars 220 to be located on the side of the circuit breaker 200 near the cable compartment 115. This ensures that the incoming line connection bars 210 and outgoing line connection bars 220 are correspondingly distributed on both sides of the circuit breaker 200, reducing wiring confusion and facilitating installation by on-site personnel. In addition, all incoming line connection bars 210 and outgoing line connection bars 220 are also arranged along the height direction, achieving a reasonable distribution and effectively preventing the connection bars from being concentrated at the bottom of the cabinet 100, thus eliminating the need for on-site personnel to squat for extended periods to connect wires.

[0032] Optionally, a first splicing gap 1114 is formed between the first partition sub-plate 1111 and the partition mother plate 1112, and a second splicing gap 1115 is formed between the second partition sub-plate 1113 and the partition mother plate 1112. By reserving the first splicing gap 1114 and the second splicing gap 1115, installation leeway is ensured. In some preferred embodiments, the width of the first splicing gap 1114 and the second splicing gap 1115 is 2mm to 5mm.

[0033] Optionally, a plurality of first through-hole groups 1116 are formed between the first partition sub-plate 1111 and the partition mother plate 1112 for the incoming line connection busbars 210 to pass through, and a plurality of second through-hole groups 1117 are formed between the second partition sub-plate 1113 and the partition mother plate 1112 for the outgoing line connection busbars 220 to pass through. Specifically, one first through-hole group 1116 consists of three incoming line through-holes 11161, and the three incoming line through-holes 11161 in one first through-hole group 1116 are used for the three incoming line connection busbars 210 of the same circuit breaker 200 to pass through. Similarly, the second through-hole group 1117 consists of three outgoing line through-holes 11171, and the three outgoing line through-holes 11171 in one second through-hole group 1117 are used for the three outgoing line connection busbars 220 of the same circuit breaker 200 to pass through.

[0034] More specifically, in combination Figure 4 and Figure 5 As shown, the first partition sub-plate 1111, the partition mother plate 1112, and the second partition sub-plate 1113 are sequentially spliced ​​from left to right to form the first partition plate 111. The right edge of the first partition sub-plate 1111 is provided with several first notches 11162, and the left edge of the partition mother plate 1112 is provided with several second notches 11163 corresponding to the first notches 11162. When the first partition sub-plate 1111 and the partition mother plate 1112 are spliced ​​together, the several first notches 11162 and the several second notches 11163 are correspondingly spliced ​​together to form several first through hole groups 1116. Similarly, the left edge of the second partition sub-plate 1113 is provided with several third notches 11172, and the right edge of the partition mother plate 1112 is provided with several fourth notches 11173 corresponding to the third notches 11172. When the second partition sub-plate 1113 and the partition mother plate 1112 are spliced ​​together, the several third notches 11172 and the several fourth notches 11173 are spliced ​​together to form several second through hole groups 1117.

[0035] Specifically, the branch busbar compartment 114 is provided with three branch busbar connectors 400, which are arranged on the same plane and spaced apart in the front-to-back direction. The thickness direction of each branch busbar connector 400 is consistent with the left-to-right direction. In this embodiment, the thickness direction of the branch busbar connector 400 is consistent with the length direction of the cabinet 100, and the three branch busbar connectors 400 are arranged in a vertical plane. The left-to-right dimensions of the branch busbar compartment 114 are made small enough to provide sufficient space for the cable compartment 115, thereby facilitating connection to external cables. Above the distribution chamber 110, the cabinet 100 is provided with main busbar connectors 300, including an A-phase main busbar connector 300, a B-phase main busbar connector 300, and a C-phase main busbar connector 300. The three branch busbar connectors 400 are connected one-to-one with the A-phase main busbar connector 300, the B-phase main busbar connector 300, and the C-phase main busbar connector 300.

[0036] In this embodiment, each of the first through-hole groups 1116 includes three incoming through-holes 11161 spaced apart in the vertical direction; within the first through-hole group 1116, the three incoming through-holes 11161 correspond one-to-one with the three-phase incoming connection blocks 210 of the same circuit breaker 200; the three-phase incoming connection blocks 210 of the same circuit breaker 200 pass through the corresponding incoming through-holes 11161 and connect to the corresponding phase's branch busbar connection block 400. Thus, the three-phase incoming connection blocks 210 of the circuit breaker 200 all pass through the incoming through-holes 11161, through the first partition plate 111, into the branch busbar chamber 114, and connect to the corresponding phase's branch busbar connection block 400.

[0037] Optionally, within the first through-hole group 1116, two inlet through-holes 11161 are flush in the horizontal direction, and another inlet through-hole 11161 protrudes horizontally relative to the two flush inlet through-holes 11161, so as to be close to the branch busbar 400 located on the front side. Figure 4 and Figure 7 As shown, after the first partition plate 111 extends, the one-phase incoming line connection bar 210 of the circuit breaker 200 bends backward from the protruding incoming line through hole 11161 and enters the branch busbar 114 to connect with the branch busbar 400 located on the front side. Only one bend is required, so that the number of bends of the phase incoming line through hole 11161 is minimized.

[0038] The remaining two phase incoming line connectors 210 bend backward from the two flush incoming line through holes 11161 and extend into the branch busbar chamber 114. When one phase incoming line connector 210 extends backward to the middle branch busbar connector 400, it bends and extends towards the middle branch busbar connector 400 before connecting to it. Similarly, when the other phase incoming line connector 210 extends backward to the rear branch busbar connector 400, it bends and extends towards the rear branch busbar connector 400 before connecting to it. This ensures sufficient clearance between the incoming line connectors 210 passing through the two flush incoming line through holes 11161 and the front branch busbar connector 400, improving safety.

[0039] Optionally, each of the second through-hole groups 1117 includes three outgoing through-holes 11171 spaced apart in the vertical direction. Within the second through-holes, the three outgoing through-holes 11171 correspond one-to-one with the outgoing connection blocks 220 of the same circuit breaker 200. The cable compartment 115 is provided with fixing seats 1151 that match the outgoing through-holes 11171 one-to-one. The three-phase outgoing connection blocks 220 of the same circuit breaker 200 pass through the corresponding outgoing through-holes 11171 and are fixedly connected to the fixing seats 1151. In this embodiment, after a three-phase outgoing connection block 220 of a circuit breaker 200 passes through the corresponding outgoing through-hole 11171, it is fixedly connected to the fixing seats 1151 in the cable compartment 115, preventing bending due to the weight of external cables and improving the stability of the outgoing connection blocks 220.

[0040] Optionally, three mounting brackets 1151 connected to the same circuit breaker 200 form a group. The three mounting brackets 1151 in the same group are spaced apart in the left-right direction, and the height of the three mounting brackets 1151 in the same group matches the height of the corresponding outgoing through hole 11171. The three mounting brackets 1151 in each group are arranged in the same order in the left-right direction. For example... Figure 7As shown, the three fixing seats 1151 in the same group can be arranged diagonally, which not only makes the three fixing seats 1151 spaced apart in the height direction, but also staggered horizontally, so that there is a sufficient gap between the ends of the three-phase outgoing connection bars 220 of the same circuit breaker 200. Of course, in some alternative embodiments, in the same group of fixing seats 1151, the highest fixing seat 1151 can also be located in the middle, the middle-height fixing seat 1151 is located to the left of the highest fixing seat 1151, and the lowest-height fixing seat 1151 is located to the right of the highest fixing seat 1151. In this way, the three fixing seats 1151 in the same group can also be arranged spaced apart in the left and right direction, and the height of the three fixing seats 1151 in the same group is consistent with the height of the corresponding outgoing through hole 11171. In addition, the three fixing seats 1151 in each group are arranged in the same order in the left and right direction, which can avoid the air gap between the fixing seats 1151 in the same row in adjacent groups being too small and failing to meet electrical safety requirements.

[0041] Optionally, in adjacent groups of fixing seats 1151, two fixing seats 1151 in the same column are staggered in the vertical direction. For example... Figure 7 As shown, among the fixed seats 1151 in the same row, one of the fixed seats 1151 will be horizontally offset by a certain distance, so that the two fixed seats 1151 in the same row are staggered in the vertical direction, increasing the air gap between the two fixed seats 1151 in the same row, so as to meet the electrical safety requirements.

[0042] Optionally, the cable compartment 115 is provided with an insulating fixing plate 1152, which is spaced apart from the first partition plate 111. The fixing seat 1151 is located on the back of the insulating fixing plate 1152, and the insulating fixing plate 1152 is provided with a clearance hole 1153 for the cable connection bar 220 to pass through. Specifically, as shown... Figure 7In the illustrated embodiment, the insulating fixing plate 1152 corresponds one-to-one with the circuit breaker 200. A set of fixing seats 1151 is provided behind each insulating fixing plate 1152. Of course, in other embodiments, the insulating fixing plate 1152 can be a single, continuous plate, with multiple sets of fixing seats 1151 positioned behind it. In this embodiment, the space formed between the insulating fixing plate 1152 and the rear side of the first partition plate 111 allows the end of a portion of the outgoing cable connection bar 220 to pass rearward through the first partition plate 111, then bend horizontally towards the branch junction box 114, and then exit through the corresponding outgoing cable through-hole 11171, finally connecting to the corresponding fixing seat 1151. This arrangement, where a portion of the outgoing cable connection bar 220 passes behind the circuit breaker 200 through the insulating fixing plate 1152, facilitates a compact configuration of the junction box. Furthermore, it reduces the area of ​​the outgoing cable connection bar 220 exposed in the cable compartment 115. More specifically, the fixing seat 1151 is an L-shaped insulating component, one flat portion of which is connected and fixed to the insulating fixing plate 1152 by a threaded component, and the other flat portion is threaded and fixed to the end of the cable outlet connector 220, thereby fixing the end of the cable outlet connector 220. More preferably, the insulating fixing plate 1152 has a square connecting hole for connecting to the fixing seat 1151, and the fixing seat 1151 and the insulating fixing plate 1152 are connected by a carriage bolt. The head of the carriage bolt abuts against the surface of the insulating fixing plate 1152 near the first partition plate 111, and the stud of the carriage bolt passes through the square connecting hole and the insulating fixing plate 1152 before being connected and fixed to a nut. The square neck of the carriage bolt engages with the square connecting hole, preventing the carriage bolt from rotating when connected to the nut. Therefore, there is no need to use a wrench in the narrow space between the insulating fixing plate 1152 and the first partition plate 111, facilitating assembly.

[0043] Optionally, the front panel of the cabinet 100 has a front connecting opening 120 for connecting to the switch chamber 112, and the rear panel of the cabinet 100 has a rear connecting opening 130 for connecting to the cable chamber 115. The front connecting opening 120 and the rear connecting opening 130 are each provided with a face cover 150 detachably connected to the cabinet 100. Thus, by removing the face cover 150, the switch chamber 112 and the cable chamber 115 can be opened for wiring. Specifically, as... Figure 8As shown, the cover plate 150 located at the front connecting opening 120 is also provided with an operation window 151, exposing the switch handle of the circuit breaker 200 for easy switching operation. Preferably, the cabinet 100 has a protruding eave 140 above the front connecting opening 120 and above the rear connecting opening 130, and the upper edge of the cover plate 150 has a hook groove 152, which engages with the protruding eave 140. In this embodiment, the cover plate 150 is initially positioned by hooking onto the protruding eave 140 through the hook groove 152, eliminating the need for another maintenance personnel to support the cover plate 150 before it is fixedly connected to the cabinet 100 by threaded parts, allowing for installation and removal by a single maintenance personnel. In addition, the hook groove 152 also functions as a handle, facilitating the lifting of the cover plate 150 by maintenance personnel.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A low-voltage combiner cabinet for a prefabricated substation, characterized in that, include: The cabinet includes a power distribution chamber. A first partition plate within the power distribution chamber forms a switch compartment with the front panel of the cabinet. A second partition plate is located behind the first partition plate, dividing the switch compartment into a branch junction compartment and a cable compartment on the left and right sides. The first partition plate includes a first sub-partition, a main partition, and a second sub-partition arranged sequentially in a left-right direction. The main partition is connected to the cabinet and positioned in front of the second partition plate. Both the first and second sub-partitions are detachably connected to the cabinet. The first sub-partition cooperates with the main partition to separate the branch junction compartment and the switch compartment; the second sub-partition cooperates with the main partition to separate the switch compartment and the cable compartment. The circuit breakers, a plurality of which are arranged laterally on the front surface of the partition mother plate and arranged along the height direction; the incoming line connection bar of each circuit breaker passes through the branch junction box from between the first partition sub-plate and the partition mother plate; the outgoing line connection bar of each circuit breaker passes through the cable compartment from between the second partition sub-plate and the partition mother plate.

2. The box-type substation low-voltage bus-dedicated cubicle according to claim 1, characterized in that: A first splicing gap is formed between the first partition sub-plate and the partition mother plate, and a second splicing gap is formed between the second partition sub-plate and the partition mother plate.

3. The box-type substation low-voltage bus-dedicated cubicle according to claim 1, characterized in that: A plurality of first through holes are formed between the first partition subplate and the partition mother plate for the incoming line connection to pass through, and a plurality of second through holes are formed between the second partition subplate and the partition mother plate for the outgoing line connection to pass through.

4. The box-type substation low-voltage bus-dedicated cubicle according to claim 3, characterized in that: The branch junction chamber is equipped with three branch junction connection bars, which are arranged on the same plane and distributed at intervals in the front-to-back direction; the thickness direction of each branch junction connection bar is consistent with the left-to-right direction; Each of the first through-hole groups includes three incoming through-holes spaced apart in the height direction; within the first through-hole group, the three incoming through-holes correspond one-to-one with the three-phase incoming connection blocks of the same circuit breaker; the three-phase incoming connection blocks of the same circuit breaker pass through the corresponding incoming through-holes and are connected to the branch busbar of the corresponding phase.

5. The box-type substation low-voltage bus-dedicated cubicle according to claim 4, characterized in that: Within the first through-hole group, two inlet through-holes are flush in the horizontal direction, and another inlet through-hole protrudes in the horizontal direction relative to the two flush inlet through-holes, so as to be close to the branch busbar located on the front side.

6. The box-type substation low-voltage bus-dedicated cubicle according to claim 3, characterized in that: Each of the second through holes includes three outgoing through holes spaced apart in the height direction. Within the second through holes, the three outgoing through holes correspond one-to-one with the outgoing connection bars of the same three-phase circuit breaker. The inside of the cable compartment is provided with a fixing seat that matches the outgoing through holes one-to-one. The outgoing connection bars of the same three-phase circuit breaker pass through the corresponding outgoing through holes and are fixedly connected to the fixing seat.

7. The box-type substation low-voltage bus-dedicated cubicle according to claim 6, characterized in that: Three mounting brackets connected to the same circuit breaker form a group. The three mounting brackets in the same group are spaced apart in the left and right direction, and the height of the three mounting brackets in the same group is consistent with the height of the corresponding outgoing through hole. The three mounting brackets in each group are arranged in the same order in the left and right direction.

8. The box-type substation low-voltage bus-dedicated cubicle according to claim 7, characterized in that: In adjacent groups of fixed seats, two fixed seats in the same column are staggered in the vertical direction.

9. The box-type substation low-voltage bus-dedicated cubicle according to claim 6, characterized in that: The cable compartment is provided with an insulating fixing plate, which is spaced apart from the first partition plate. The fixing seat is located on the back of the insulating fixing plate, and the insulating fixing plate is provided with a clearance hole for the outgoing cable connection to pass through.

10. The box-type substation low-voltage bus duct of claim 1, wherein: The front panel of the cabinet has a front connecting opening for connecting to the switch compartment, and the rear panel of the cabinet has a rear connecting opening for connecting to the cable compartment. The front connecting opening and the rear connecting opening are respectively provided with a cover plate that can be detachably connected to the cabinet.

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