A compact box-type substation low-voltage bus cabinet

Abstract

This invention relates to the field of electrical cabinet technology, and particularly to a compact prefabricated substation low-voltage combiner cabinet, comprising a cabinet body and power distribution components. The cabinet body is divided into at least two power distribution chambers along its length. Each power distribution chamber is further divided into a switch chamber, a branch combiner chamber, and a cable chamber. The branch combiner chamber and the cable chamber are located behind the switch chamber and are separated from each other along the length of the cabinet body. The cabinet body also includes a main combiner chamber, which is located above all the power distribution chambers. Top partitions are provided on the tops of the switch chamber and the cable chamber. In this application, the switch chamber is separately isolated from the main combiner chamber, the branch combiner chamber, and the cable chamber, and the cable chamber is separately isolated from the branch combiner chamber and the main combiner chamber. The outgoing lines of each circuit breaker can directly enter the cable chamber from the switch chamber. Compared with existing combiner cabinets, this application does not require entering the branch combiner chamber and then extending to the cable chamber, thus meeting the design requirements for a high degree of isolation.

Description

Technical Field

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

[0002] For overseas prefabricated substations, due to shipping requirements, they are typically constructed as 20HC containers. Therefore, the low-voltage combiner cabinets in string-type prefabricated substations need to be as compact as possible, while maximizing the number of switching circuits within a limited space. However, in existing technologies, such as the prefabricated substation and photovoltaic system disclosed in patent document CN120033541A, the circuit breakers in the combiner cabinet are vertically arranged in two rows, with a horizontal partition separating the upper combiner compartment and the lower cable compartment behind the lower row of circuit breakers. The connection strips for the upper row of circuit breakers to connect to external cables need to extend downwards from the rear combiner compartment into the cable compartment. At this point, the cable compartment contains the connection strips for both the upper and lower row circuit breakers to external cables. Because the cable compartment has limited space, the more switching circuits there are, the denser the connection strips become, making on-site installation difficult when connecting to external cables. In addition, the connection bar between the upper circuit breaker and the external cable will also enter the busbar room. That is, the connection bar between the upper circuit breaker and the external cable is not separated from the busbar, which cannot meet the design requirements of a high degree of isolation. Summary of the Invention

[0003] The main objective of this invention is to provide a compact prefabricated substation low-voltage combiner cabinet that meets the design requirements of high isolation while maximizing the number of switching circuits and facilitating on-site wiring.

[0004] To achieve the above objectives, this invention proposes a compact prefabricated substation low-voltage combiner cabinet, comprising a cabinet body and power distribution components; the cabinet body is divided into at least two power distribution chambers along its length; each power distribution chamber is further divided into a switch chamber, a branch combiner chamber, and a cable chamber, with the branch combiner chamber and cable chamber located behind the switch chamber and separated from the cable chamber along the length of the cabinet body; the cabinet body also includes a main combiner chamber, which is located above all the power distribution chambers; the tops of the switch chamber and cable chamber are respectively provided with top partition plates to separate them from the main combiner chamber. The power distribution assembly includes a main busbar, branch busbars, and circuit breakers. The main busbar is located in the main busbar compartment. In each power distribution compartment, a branch busbar is located in the branch busbar compartment, with its top end connected to the main busbar. In each power distribution compartment, multiple circuit breakers are arranged horizontally and along the height of the cabinet in the switch compartment. Each circuit breaker is connected to the branch busbar in the branch busbar compartment via an incoming line connector. Each circuit breaker is connected to the external cables in the cable compartment via an outgoing line connector.

[0005] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, the cabinet body is provided with at least one first partition plate to separate at least two power distribution chambers; each power distribution chamber is provided with a second partition plate to form a switch chamber between the second partition plate and the front panel of the cabinet body; each power distribution chamber is provided with a third partition plate located behind the second partition plate to separate a branch combiner chamber and a cable chamber along the length of the cabinet body.

[0006] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, branch combiner compartments and cable compartments are arranged alternately along the length of the cabinet.

[0007] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, the thickness direction of the branch combiner connection bar is consistent with the length direction of the cabinet body; in the same branch combiner room, the number of branch combiner connection bars is three, the three branch combiner connection bars are on the same plane, and are distributed at intervals along the width direction of the cabinet body.

[0008] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, the incoming line terminal of the circuit breaker is located at the end of its own length direction near the branch combiner compartment. In each circuit breaker, there are three incoming line terminals and three incoming line connection bars. The incoming line terminals are spaced apart along the height direction of the cabinet. One end of each incoming line connection bar is connected to the corresponding incoming line terminal of the circuit breaker, and the other end of the incoming line connection bar is connected to the corresponding branch combiner connection bar.

[0009] In the aforementioned compact box-type substation low-voltage combiner cabinet, a fixed base is provided in the cable compartment, the outgoing end of the circuit breaker is located at the end of its own length direction close to the cable compartment, one end of the outgoing connection bar is connected to the outgoing end of the circuit breaker, and the other end of the outgoing connection bar extends backward into the cable compartment and is fixedly connected to the fixed base.

[0010] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, each circuit breaker has three outgoing terminals and three outgoing connection bars, with the outgoing terminals spaced apart along the height of the cabinet. Three mounting brackets connected to the same circuit breaker form a group, and the three mounting brackets in the same group are spaced apart along the length of the cabinet, with the height of the three mounting brackets in the same group matching the height of the corresponding outgoing terminal of the circuit breaker. The three mounting brackets in each group are spaced apart in the same order in the left-right direction.

[0011] In the aforementioned compact box-type substation low-voltage combiner cabinet, the cable compartment is equipped with an insulating fixing plate, which is spaced apart on the rear side of the switch compartment to form a horizontally curved space for the power supply line connection bar; the fixing base is located on the rear side of the insulating fixing plate, and the insulating fixing plate has through holes through which the power supply line connection bar passes.

[0012] In the aforementioned compact prefabricated substation low-voltage combiner cabinet, there are two first partition plates and three distribution chambers.

[0013] In the aforementioned compact box-type substation low-voltage combiner cabinet, the front panel of the cabinet is provided with multiple connecting openings corresponding to the switch compartment, and the cabinet is provided with multiple faceplates corresponding to the connecting openings; the cabinet is provided with a protruding eave above the connecting opening, and the faceplate is provided with a hook groove, which is in concave-convex fit with the protruding eave.

[0014] The technical solution provided by this invention may include the following beneficial effects: In the low-voltage combiner cabinet provided by this invention, the branch combiner compartment and the cable compartment are located behind the switch compartment, and the branch combiner compartment and the cable compartment are separated along the length of the cabinet. The top of the switch compartment and the cable compartment are respectively provided with a top partition plate to separate them from the main combiner compartment, so that the switch compartment is isolated from the main combiner compartment, the branch combiner compartment and the cable compartment, and the cable compartment is isolated from the branch combiner compartment and the main combiner compartment. The outgoing lines of each circuit breaker can directly enter the cable compartment from the switch compartment. Compared with the existing combiner cabinet, this application does not need to enter the branch combiner compartment and then extend to the cable compartment, which can meet the design requirements of high isolation.

[0015] The branch busbar compartment and the cable compartment are separated along the length of the cabinet, resulting in a larger cable compartment height. This prevents the branch busbars from occupying space in the height direction of the cable compartment, thus avoiding the concentration of all outgoing connection strips at the bottom of the cabinet and facilitating on-site connection to external cables. Simultaneously, all incoming connection strips are located on the side of the circuit breaker closest to the branch busbar compartment, and all outgoing connection strips are located on the side of the circuit breaker closest to the cable compartment. This ensures that the incoming and outgoing connection strips are distributed on opposite sides of the circuit breaker, reducing wiring confusion and facilitating on-site installation.

[0016] Furthermore, the horizontal arrangement of the circuit breaker in this application allows for the addition of as many switching circuits as possible within a limited space. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the external structure of the compact box-type substation low-voltage combiner cabinet of the present invention; Figure 2 This is a schematic diagram of the power distribution chamber of the present invention; Figure 3This is a schematic diagram of the internal structure of the compact box-type substation low-voltage combiner cabinet of the present invention; Figure 4 This is a schematic diagram of the power distribution component of the present invention; Figure 5 This is a schematic diagram of the structure of the second partition plate of the present invention; Figure 6 for Figure 5 An enlarged structural diagram of region A in the embodiment; Figure 7 This is a schematic diagram showing the connection between the circuit breaker, branch bus, and fixed base of the present invention; Figure 8 This is a schematic diagram of the structure of the front panel of the present invention; Figure 9 This is a schematic diagram of the column spacing between two adjacent vertically placed circuit breakers in the prior art; Figure 10 This is a schematic diagram showing the column spacing between two adjacent horizontally placed circuit breakers in this invention; In the attached diagram: 100 - Cabinet, 110 - Distribution Chamber, 111 - Switch Chamber, 112 - Branch Busbar Chamber, 113 - Cable Chamber, 1131 - Mounting Base, 1132 - Insulation Mounting Plate, 1133 - Through Hole, 120 - Main Busbar Chamber, 130 - Frame Circuit Breaker Chamber, 140 - Secondary Wiring Chamber, 150 - First Partition Plate, 160 - Second Partition Plate, 161 - First Partition Sub-plate, 162 - Partition Mother Plate, 163 - Second Partition Sub-plate, 170 - Third Partition Plate 164-First gap, 165-Second gap, 166-Third gap, 167-Fourth gap, 180-Connecting opening, 181-Face cover, 182-Eaves, 183-Hanging slot, 184-Operating window, 190-Top partition, 200-Power distribution assembly, 210-Main busbar connection, 220-Branch busbar connection, 230-Circuit breaker, 231-Incoming line connection, 232-Outgoing line connection, 233-Incoming end, 234-Outgoing end. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] In a specific application embodiment, the compact prefabricated substation low-voltage combiner cabinet provided by the present invention is used in a photovoltaic system. The photovoltaic system includes multiple photovoltaic modules, multiple photovoltaic inverters, a prefabricated substation, and a power grid. Each photovoltaic module converts solar energy into direct current (DC) through the photovoltaic effect and inputs it into the corresponding photovoltaic inverter. The multiple photovoltaic inverters convert the DC output from the photovoltaic modules into alternating current (AC) and further transmit the AC to the prefabricated substation. The prefabricated substation combines the low-voltage AC input from the multiple photovoltaic inverters through the low-voltage combiner cabinet, and then steps up the voltage through a step-up transformer before transmitting it to the power grid.

[0024] The following is combined Figures 1 to 4 This invention describes a compact box-type substation low-voltage combiner cabinet, comprising a cabinet 100 and a power distribution assembly 200.

[0025] like Figure 2 As shown, the cabinet 100 is divided into at least two power distribution chambers 110 along its length; each power distribution chamber 110 is further divided into a switch chamber 111, a branch junction chamber 112, and a cable chamber 113. The branch junction chamber 112 and the cable chamber 113 are located behind the switch chamber 111, and the branch junction chamber 112 and the cable chamber 113 are separated along the length of the cabinet 100; Figure 3As shown, the cabinet 100 is also provided with a main busbar compartment 120, which is located above all the power distribution compartments 110; the top of the switch compartment 111 and the cable compartment 113 are respectively provided with top partition plates 190 to separate them from the main busbar compartment 120.

[0026] like Figure 4 As shown, the power distribution assembly 200 includes a main busbar 210, a branch busbar 220, and circuit breakers 230. The main busbar 210 is located in the main busbar compartment 120. In each power distribution compartment 110, a branch busbar 220 is located in a branch busbar compartment 112, and the top of the branch busbar 220 is connected to the main busbar 210. In each power distribution compartment 110, multiple circuit breakers 230 are arranged laterally and along the height of the cabinet 100 in the switch compartment 111. Each circuit breaker 230 is connected to the branch busbar 220 in the branch busbar compartment 112 via an incoming line connector 231. Each circuit breaker 230 is connected to the external cables in the cable compartment 113 via an outgoing line connector 232.

[0027] In the low-voltage combiner cabinet provided by the present invention, the branch combiner compartment 112 and the cable compartment 113 are located behind the switch compartment 111, and the branch combiner compartment 112 and the cable compartment 113 are separated along the length of the cabinet 100. The top of the switch compartment 111 and the cable compartment 113 are respectively provided with top partition plates 190 to separate them from the main combiner compartment 120, so that the switch compartment 111 is isolated from the main combiner compartment 120, the branch combiner compartment 112 and the cable compartment 113, and the cable compartment 113 is isolated from the branch combiner compartment 112 and the main combiner compartment 120. The outgoing line connection bar 232 of each circuit breaker 230 can directly enter the cable compartment 113 in the switch compartment 111. Compared with the existing combiner cabinet, this application does not need to enter the branch combiner compartment 112 and then extend into the cable compartment 113, which can meet the design requirements of high isolation.

[0028] The branch busbar compartment 112 and the cable compartment 113 are separated along the length of the cabinet 100, resulting in a larger cable compartment 113. This prevents the branch busbars from occupying space in the height direction of the cable compartment 113, thus avoiding the concentration of all outgoing connection bars 232 at the bottom of the cabinet 100, facilitating on-site connection to external cables. Simultaneously, all incoming connection bars 231 can be located on the side of the circuit breaker 230 closest to the branch busbar compartment 112, and all outgoing connection bars 232 can be located on the side of the circuit breaker 230 closest to the cable compartment 113. This ensures that the incoming and outgoing connection bars 231 and 232 are correspondingly distributed on both sides of the circuit breaker 230, reducing wiring confusion and facilitating on-site installation.

[0029] Furthermore, it is worth noting that, such as Figure 1In the illustrated embodiment, the circuit breakers 230 of this application are arranged laterally, allowing for a row of eight circuit breakers 230 to be installed within a single switch compartment 111, which is more conducive to maximizing the number of switching circuits within a limited space. Specifically, due to maritime transport requirements, the height of shipping containers is generally fixed, and the overall height of existing combiner cabinets and the combiner cabinet of this application will be at the standard height, i.e., the height of the combiner cabinet is limited to within 2300mm. Therefore, to accommodate as many switching circuits as possible, the length of the cabinet 100 will be increased, while the width of the cabinet 100 will remain unchanged. Figure 9 As shown, for the prior art circuit breaker 230 arranged in two rows, the column spacing between the two circuit breakers 230 in the length direction is 135mm. However, in the solution of this application, as... Figure 10 As shown, the spacing between the two rows of circuit breakers 230 is 510mm. If the design target is 24 switching circuits, existing combiner cabinets require two rows of circuit breakers 230, with 12 circuit breakers in each row, requiring a length of 135mm * 12 = 1620mm. In this application, however, three rows of circuit breakers 230 are required, occupying a length of 510mm * 3 = 1530mm. If the design length within the cabinet 100 that can accommodate the circuit breakers 230 is 1530mm, then existing combiner cabinets can only hold 22 circuit breakers 230, while this application can hold 24. Therefore, this application can accommodate more switching circuits.

[0030] In some optional embodiments, the cabinet 100 is further provided with a frame circuit breaker compartment 130 and a secondary line compartment 140 above the main busbar compartment 120, and the frame circuit breaker compartment 130 and the secondary line compartment 140 are separated along the length of the cabinet 100. The frame circuit breaker compartment 130 contains a frame circuit breaker 230, which is connected to the main busbar and can directly control the on / off state of the entire low-voltage busbar.

[0031] Optionally, the cabinet 100 is provided with at least one first partition plate 150 to separate at least two power distribution chambers 110; each power distribution chamber 110 is provided with a second partition plate 160 so that a switch chamber 111 is formed between the second partition plate 160 and the front panel of the cabinet 100; each power distribution chamber 110 is provided with a third partition plate 170 located behind the second partition plate 160 to separate a branch junction chamber 112 and a cable chamber 113 along the length of the cabinet 100. Specifically, as shown... Figure 2In one embodiment shown, the first partition plate 150 is arranged parallel to the side wall along the length of the cabinet 100, thereby dividing the cabinet 100 into at least two power distribution chambers 110. The second partition plate 160 is parallel to the front panel of the cabinet 100, such that the front panel of the cabinet 100, the second partition plate 160, and the side walls of the power distribution chambers 110 together form a switch chamber 111. The third partition plate 170 is arranged parallel to the first partition plate 150, thereby dividing the cabinet into a branch junction chamber 112 and a cable chamber 113.

[0032] In an optional embodiment of the present invention, the second partition plate 160 is an insulating plate, including a first partition sub-plate 161, a partition mother plate 162, and a second partition sub-plate 163 arranged sequentially in the left-right direction. The partition mother plate 162 is connected to the cabinet 100 and is disposed on the front side of the second partition plate 160. Both the first partition sub-plate 161 and the second partition sub-plate 163 are detachably connected to the cabinet 100. The first partition sub-plate 161 cooperates with the partition mother plate 162 to separate the branch junction chamber 112 and the switch chamber 111. The second partition sub-plate 163 cooperates with the partition mother plate 162 to separate the switch chamber 111 and the cable chamber 113. Figure 5 In the illustrated embodiment, the two side edges of the partition panel 162 are spaced apart from the left and right side walls of the distribution chamber 110, forming openings that connect to the branch junction chamber 112 and the cable chamber 113. The openings are filled by the first partition sub-plate 161 and the second partition sub-plate 163 to separate the switch chamber 111 from the branch junction chamber 112 and the cable chamber 113. A plurality of circuit breakers 230 are laterally arranged on the front surface of the partition panel 162 and along the height direction; the incoming line connection bar 231 of each circuit breaker 230 passes through the first partition sub-plate 161 and the partition panel 162 into the branch junction chamber 112; the outgoing line connection bar 232 of each circuit breaker 230 passes through the second partition sub-plate 163 and the partition panel 162 into the cable chamber 113. Specifically, as shown... Figure 6 As shown, the incoming terminal 233 of the circuit breaker 230 is located at the end of its length near the branch busbar 112, and the outgoing terminal 234 of the circuit breaker 230 is located at the end of its length near the branch busbar 112. The incoming terminal 233 of the circuit breaker 230 is connected to the branch busbar 220 via the incoming connection busbar 231. The outgoing terminal 234 of the circuit breaker 230 is connected to external cables via the outgoing connection busbar 232.

[0033] The second partition plate 160 is constructed by splicing together a first partition sub-plate 161, a partition mother plate 162, and a second partition sub-plate 163 to facilitate the assembly of multiple incoming line connection bars 231 and outgoing line connection bars 232. Specifically, when assembling the circuit breaker 230 in the combiner cabinet, multiple circuit breakers 230 are first fixed in an arranged manner on the surface of the partition mother plate 162. Since the first partition sub-plate 161 is not installed, an opening is formed between the partition mother plate 162 and the side wall of the distribution chamber 110, connecting the branch combiner chamber 112, so that the incoming line connection bars 231 can connect the branch combiner connection bars 220 and the incoming line terminals 233 of the circuit breakers 230. Similarly, since the second partition sub-plate 163 is not installed, an opening is formed between the partition mother plate 162 and the side wall of the distribution chamber 110, connecting the cable chamber 113, so that the outgoing line connection bars 232 can connect the external cables and the outgoing line terminals 234 of the circuit breakers 230. After all incoming line connectors 231 and outgoing line connectors 232 are installed, the first partition panel 161 and the second partition panel 163 are then installed to isolate the switch compartment 111 from the branch junction compartment 112 and the cable compartment 113, thus meeting the isolation requirements of the combiner cabinet. When it is necessary to inspect or replace the incoming line connectors 231 and outgoing line connectors 232, the first partition panel 161 and the second partition panel 163 can be removed, improving the convenience of maintenance.

[0034] In an optional embodiment of the present invention, such as Figure 2 As shown, the branch busbars 112 and cable compartments 113 are arranged alternately along the length of the cabinet 100. This ensures that the spacing between the branch busbars 220 in different power distribution compartments 110 is uniform, preventing the branch busbars 220 from being too close together and hindering their connection to the main busbar 210.

[0035] Furthermore, such as Figure 4 As shown, in this application, there are three main busbars 210, each corresponding to one of the three phases of the AC power supply. Correspondingly, in each distribution chamber, there are also three branch busbars 220, and each circuit breaker 230 has three incoming busbars and three outgoing busbars.

[0036] In a preferred embodiment of the present invention, such as Figure 2 As shown, the thickness direction of the branch busbar 220 is consistent with the length direction of the cabinet 100; in the same branch busbar compartment 112, three branch busbars 220 are on the same plane and are distributed at intervals along the width direction of the cabinet 100. In this embodiment, the thickness direction of the branch busbar 220 is consistent with the length direction of the cabinet 100, and the three branch busbars 220 are arranged in a vertical plane; the size of the branch busbar compartment 112 in the length direction of the cabinet 100 is made small enough so that the cable compartment 113 has enough space, thereby facilitating wiring.

[0037] In optional embodiments of the present invention, such as Figure 5 As shown, the incoming terminal 233 of the circuit breaker 230 is located at the end of its length near the branch junction box 112, and the outgoing terminal 234 of the circuit breaker 230 is located at the end of its length near the cable compartment 113. In each circuit breaker 230, there are three incoming terminals 233 and three incoming connection bars 231, and three outgoing terminals 234 and three outgoing connection bars 232. The incoming terminals 233 are spaced apart along the height of the cabinet 100, and one end of each incoming connection bar 231 is connected to the corresponding incoming terminal 233 of the circuit breaker 230, as shown below. Figure 7 As shown, the other end of the incoming line connector 231 bends backward and passes through the second partition plate 160 before connecting to the corresponding branch bus connector 220. Outgoing line terminals 234 are spaced apart along the height of the cabinet 100. One end of the outgoing line connector 232 is connected to the outgoing line terminal 234 of the circuit breaker 230, and the other end of the outgoing line connector 232 bends backward and passes through the second partition plate 160 before connecting to the corresponding external cable.

[0038] Optionally, a plurality of first through-hole groups are formed between the first partition sub-plate 161 and the partition mother plate 162 for the incoming line connection group 231 to pass through. Each first through-hole group consists of three incoming line through-holes, and the three incoming line through-holes in one first through-hole group are used for the three incoming line connection groups 231 of the same circuit breaker 230 to pass through. Specifically, as shown... Figure 6 In the illustrated embodiment, the first partition sub-plate 161, the partition mother plate 162, and the second partition sub-plate 163 are sequentially spliced ​​from left to right to form the second partition plate 160. The right edge of the first partition sub-plate 161 is provided with several first notches 164, and the left edge of the partition mother plate 162 is provided with several second notches 165 corresponding to the first notches 164. When the first partition sub-plate 161 and the partition mother plate 162 are spliced ​​together, the several first notches 164 and the several second notches 165 are correspondingly spliced ​​together to form several first through-hole groups, so that the incoming line connection busbars 231 of the three phases of the circuit breaker 230 pass through the incoming line through-holes through the second partition plate 160 and enter the branch busbar chamber 112 to connect with the corresponding phase branch busbar connection busbars 220.

[0039] Similarly, in this embodiment, a plurality of second through-hole groups are formed between the second partition sub-plate 163 and the partition mother plate 162 for the outgoing line connection busbars 232 to pass through. Each group of second through-holes consists of three outgoing through-holes, and the outgoing through-holes within one group are used for the passage of three outgoing line connection busbars 232 of the same circuit breaker 230. Specifically, as... Figure 6In the illustrated embodiment, the first partition sub-plate 161, the partition mother plate 162, and the second partition sub-plate 163 are sequentially spliced ​​from left to right to form the second partition plate 160. The left edge of the second partition sub-plate 163 has several third notches 166, and the right edge of the partition mother plate 162 has several fourth notches 167 corresponding to the third notches 166. When the second partition sub-plate 163 and the partition mother plate 162 are spliced, the several third notches 166 and the several fourth notches 167 correspond to each other and form several groups of second through holes. This allows the three-phase outgoing line connectors 232 of the circuit breaker 230 to pass through the outgoing line through holes, pass through the second partition plate 160, and enter the cable compartment 113.

[0040] More preferably, such as Figure 6 As shown, in the first through-hole group, two inlet through-holes are horizontally flush, while another inlet through-hole protrudes horizontally relative to the two flush inlet through-holes, close to the branch busbar 220 located at the front. Thus, after one phase inlet busbar 231 of the circuit breaker 230 extends from the second partition plate 160, it bends backward from the protruding inlet through-hole into the branch busbar chamber 112 to connect with the branch busbar 220 located at the front, requiring only one bend, minimizing the number of bends for that phase inlet busbar 231. The remaining two phase inlet busbars 231 bend backward from the two flush inlet through-holes and extend into the branch busbar chamber 112. When one phase inlet busbar 231 extends backward to the middle branch busbar 220, it bends and extends towards the middle branch busbar 220 before connecting with it. When the other phase incoming line connector 231 extends rearward to the rear branch busbar, the phase incoming line connector 231 bends and extends towards the rear branch busbar connector 220 before connecting to it. This ensures sufficient clearance between the incoming line connector 231, which passes through two flush incoming line through-holes, and the front branch busbar connector 220, improving safety.

[0041] Optionally, a fixing seat 1131 is provided inside the cable compartment 113, and one end of the outgoing cable connector 232 extends rearward into the cable compartment 113 and is fixedly connected to the fixing seat 1131. In this embodiment, the fixing seat 1131 is used to fix the end of the outgoing cable connector 232, so that the end position of the outgoing cable connector 232 is fixed and will not be bent due to the weight of the external cable, thereby improving the stability of the outgoing cable connector 232.

[0042] In this embodiment, three mounting brackets 1131 connected to the same circuit breaker 230 form a group. The three mounting brackets 1131 in the same group are spaced apart along the length of the cabinet 100, and their height corresponds to the height of the corresponding outgoing terminal 234 of the circuit breaker 230. The three mounting brackets 1131 in each group are arranged in the same order in the left-right direction. In this embodiment, the mounting brackets 1131 correspond in height to the outgoing terminal 234, and the three mounting brackets 1131 are staggered along the length of the cabinet 100. This causes the ends of the outgoing connection strip 232 that connect to external cables to be horizontally and vertically offset, increasing the air gap between the ends of the outgoing connection strip 232. This facilitates electrical safety requirements and also makes it easier to connect to external cables. Furthermore, the same order in the left-right direction of the three mounting brackets 1131 in each group prevents the air gap between mounting brackets 1131 in adjacent groups from being too small, thus failing to meet electrical safety requirements.

[0043] Specifically, such as Figure 7 As shown, the three fixing seats 1131 in the same group can be arranged diagonally, which not only makes the three fixing seats 1131 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 line connection bar 232 of the same circuit breaker 230. Of course, in some alternative embodiments, in the same group of fixing seats 1131, the highest fixing seat 1131 can also be located in the middle, the middle-height fixing seat 1131 is located to the left of the highest fixing seat 1131, and the lowest-height fixing seat 1131 is located to the right of the highest fixing seat 1131. In this way, the three fixing seats 1131 in the same group can also be arranged spaced apart in the left and right direction, and the height of the three fixing seats 1131 in the same group is consistent with the height of the corresponding outgoing line through hole 1133.

[0044] More preferably, in adjacent groups of fixing seats 1131, two fixing seats 1131 in the same column are staggered in the vertical direction. For example... Figure 7 As shown, among the fixed seats 1131 in the same row, one of the fixed seats 1131 will be horizontally offset by a certain distance, so that the two fixed seats 1131 in the same row are staggered in the vertical direction, increasing the air gap between the two fixed seats 1131 in the same row, so as to meet the electrical safety requirements.

[0045] Further optional, such as Figure 3As shown, the cable compartment 113 is provided with insulating fixing plates 1132, which are spaced apart on the rear side of the switch compartment 111 to form a space for the horizontal bending of the outgoing line connection strip 232. A fixing seat 1131 is provided on the rear side of the insulating fixing plate 1132, which has a through hole 1133 through which the outgoing line connection strip 232 passes. In this embodiment, the space formed by the insulating fixing plate 1132 and the rear side of the switch compartment 111 allows the ends of a portion of the outgoing line connection strip 232 to pass rearward through the second partition plate 160, then bend horizontally towards the branch junction compartment 112, and then exit through the through hole 1133 to connect with the fixing seat 1131. This allows a portion of the outgoing line connection strip 232 to pass through the insulating fixing plate 1132 on the rear side of the circuit breaker 230, facilitating a compact arrangement of the junction box. Furthermore, it reduces the area of ​​the outgoing line connection strip 232 exposed in the cable compartment 113.

[0046] Specifically, such as Figure 7 As shown, the number of insulating fixing plates 1132 corresponds one-to-one with the number of circuit breakers 230. More specifically, the fixing seat 1131 is an L-shaped component, with one flat portion connected and fixed to the insulating fixing plate 1132 via a threaded connection, and the other flat portion connected and fixed to the end of the outgoing line connection bar 232 via a threaded connection, thus fixing the end of the outgoing line connection bar 232. More preferably, the insulating fixing plate 1132 has a square connecting hole for connecting to the fixing seat 1131, and the fixing seat 1131 and the insulating fixing plate 1132 are connected by a carriage bolt. The head of the carriage bolt abuts against the surface of the insulating fixing plate 1132 near the second partition plate 160, and the stud of the carriage bolt passes through the square connecting hole and the insulating fixing plate 1132 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 1132 and the second partition plate 160, facilitating assembly.

[0047] Preferably, such as Figure 2As shown, there are two first partition plates 150 and three distribution chambers 110. In this embodiment, there are three distribution chambers 110 and three branch busbars 220 for each phase, which helps to reduce the amount of conductive material used. Specifically, the branch busbars 220 are copper busbars. Taking a design with 24 switch circuits as an example, the existing busbar cabinet uses two rows of circuit breakers 230, so there are two branch busbars for each phase. Each phase branch busbar needs to connect 12 circuit breakers 230. Since the more circuit breakers 230 connected, the larger the specifications of the branch busbars need to be, each phase branch busbar uses two copper busbars with a cross-sectional area of ​​10×120 mm. In this embodiment, although the number of branch busbars 220 for each phase has increased, each branch busbar 220 connects only eight circuit breakers 230. Therefore, the copper busbar specifications can be reduced, using three copper busbars with a cross-sectional area of ​​5×120 mm. Since the total number of circuit breakers 230 connected is the same, the total length of all branch busbars 220 is basically similar. However, the copper busbar specifications used in the branch busbars 220 of this application are reduced, thus reducing the overall amount of copper busbars used.

[0048] Optionally, the front panel of the cabinet 100 has multiple connecting openings 180 corresponding to the switch chambers 111, and the cabinet 100 has multiple faceplates 181 corresponding to the connecting openings 180. Preferably, the cabinet 100 has a protruding eave 182 above the connecting openings 180, and the faceplate 181 has a hook groove 183, which engages with the protruding eave 182. When installing the faceplate 181, it needs to be fixedly connected to the cabinet 100 using threaded parts. To facilitate installation by maintenance personnel, in this embodiment, the faceplate 181 is initially positioned by hooking onto the protruding eave 182 through the hook groove 183, eliminating the need for another maintenance personnel to support the faceplate 181, allowing one maintenance personnel to install and remove it. In addition, the hook groove 183 can also serve as a handle to facilitate lifting the faceplate 181 by maintenance personnel. More specifically, as shown in the figure... Figure 8 As shown, the faceplate 181 has an operation window 184, which exposes the switch handle of the circuit breaker 230 for easy switching operation.

[0049] 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 compact cubicle transformer substation low voltage busway characterized by: Including cabinet and power distribution components; The cabinet is divided into at least two power distribution chambers along its length. Each power distribution chamber is further divided into a switch chamber, a branch junction chamber, and a cable chamber. The branch junction chamber and the cable chamber are located behind the switch chamber and are separated from the cable chamber along the length of the cabinet. The cabinet also has a main junction chamber, which is located above all the power distribution chambers. The tops of the switch chamber and the cable chamber are respectively provided with top partitions to separate them from the main junction chamber. The power distribution assembly includes a main busbar, branch busbars, and circuit breakers; the main busbar is located in the main busbar compartment; in each power distribution compartment, the branch busbar is located in the branch busbar compartment, and the top of the branch busbar is connected to the main busbar; in each power distribution compartment, multiple circuit breakers are arranged laterally and along the height of the cabinet in the switch compartment; each circuit breaker is connected to the branch busbar in the branch busbar compartment via an incoming line connector; each circuit breaker is connected to external cables in the cable compartment via an outgoing line connector.

2. The compact cubicle transformer substation low voltage busway of claim 1, wherein: The cabinet is provided with at least one first partition to divide at least two power distribution chambers; each power distribution chamber is provided with a second partition to form a switch chamber between the second partition and the front panel of the cabinet; each power distribution chamber is provided with a third partition located behind the second partition to divide a branch junction chamber and a cable chamber along the length of the cabinet.

3. The compact cubicle transformer substation low voltage busway of claim 1, wherein: Along the length of the cabinet, the branch junction chamber and the cable chamber are arranged alternately.

4. The compact cubicle transformer substation low voltage busway of claim 1, wherein: The thickness direction of the branch busbar is consistent with the length direction of the cabinet; in the same branch busbar room, there are three branch busbars, which are arranged on the same plane and are spaced apart along the width direction of the cabinet.

5. The compact cubicle transformer substation low voltage busway of claim 1, wherein: The incoming line terminal of the circuit breaker is located at the end of its length direction near the branch busbar. In each circuit breaker, there are three incoming line terminals and three incoming line connection bars. The incoming line terminals are spaced apart along the height direction of the cabinet. One end of each incoming line connection bar is connected to the corresponding incoming line terminal of the circuit breaker, and the other end of the incoming line connection bar is connected to the corresponding branch busbar connection bar.

6. The compact cubicle transformer substation low voltage busway of claim 1, wherein: The cable compartment is equipped with a fixed base. The outgoing terminal of the circuit breaker is located at the end of its length direction near the cable compartment. One end of the outgoing connection bar is connected to the outgoing terminal of the circuit breaker, and the other end of the outgoing connection bar extends backward into the cable compartment and is fixedly connected to the fixed base.

7. The compact cubicle transformer substation low voltage busway of claim 6, wherein: In each circuit breaker, there are three outgoing terminals and three outgoing connection bars, and the outgoing terminals are spaced apart along the height of the cabinet. Three mounting brackets connected to the same circuit breaker form a group. The three mounting brackets in the same group are spaced apart along the length of the cabinet, and the height of the three mounting brackets in the same group is consistent with the height of the corresponding outgoing terminal of the circuit breaker. The three mounting brackets in each group are spaced apart in the same order in the left and right directions.

8. The compact cubicle transformer substation low voltage busway of claim 7, wherein: The cable compartment is provided with an insulating fixing plate, which is spaced apart on the rear side of the switch compartment to form a space for the horizontal bending of the supply line connection bar; the fixing base is provided on the rear side of the insulating fixing plate, and the insulating fixing plate is provided with a through hole through which the supply line connection bar passes.

9. The compact cubicle transformer substation low voltage busway of claim 2, wherein: The number of the first partition plate is two, and the number of the power distribution chambers is three.

10. The compact cubicle transformer substation low voltage busway of claim 1, wherein: The front panel of the cabinet has multiple connecting openings that correspond one-to-one with the switch compartments, and the cabinet has multiple faceplates that correspond one-to-one with the connecting openings; the cabinet has a raised eave above the connecting openings, and the faceplate has a hook groove that engages with the raised eave.

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