The T-shaped busbar device at the bottom of the inverter cabinet in a prefabricated substation and the inverter cabinet of the prefabricated substation

Abstract

The present invention relates to the field of electric power equipment, and in particular to a T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation, which comprises a T-shaped busbar, a busbar fixing structure and a mounting bracket. The cross section of the T-shaped busbar is a T-shaped structure, which comprises a busbar vertical portion and a busbar horizontal portion connected to the busbar vertical portion, the busbar vertical portion is connected to at least one rectangular busbar, the busbar fixing structure comprises a T-shaped slot arranged thereon, the T-shaped busbar is inserted into the T-shaped slot, and the busbar fixing structure is fixed by a mounting bracket; the T-shaped busbar device of the present invention is simple and reliable to assemble, stable in operation and large in current carrying capacity; and also relates to an inverter cabinet of a prefabricated substation comprising the T-shaped busbar device, which has a simple structure, is simple and reliable to assemble, has high structural strength and large in current carrying capacity.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, and in particular to a T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation, and an inverter cabinet of a prefabricated substation comprising the T-shaped busbar device at the bottom of an inverter cabinet in the prefabricated substation. Background Art

[0002] In the power transmission and transformation system of photovoltaic power generation, a large number of prefabricated substations equipped with inverter equipment, transformers, high-voltage switchgear, etc. are required. Inverter equipment is an extremely important component. It converts the direct current generated by the photovoltaic module into low-voltage alternating current that meets the requirements, and then boosts it to high-voltage alternating current through the transformer. The high-voltage switchgear transmits the electric energy to the power grid. Considering the capacity limit of the inverter equipment, the inverter equipment required for each prefabricated substation is generally composed of multiple units arranged in a row, which collects the alternating current output from the bottom of each inverter equipment cabinet and transmits the electric energy to the low-voltage side of the transformer.

[0003] At present, the same type of prefabricated substation inverter equipment for photovoltaic power generation in the industry generally has two ways to collect the AC power output from the bottom of each inverter equipment cabinet. One is to connect to the busbar on the low-voltage side of the transformer through many low-voltage cables. The other is to collect the AC power output from the bottom of each inverter equipment cabinet to the rectangular busbar and then connect it to the low-voltage side of the transformer. The above two methods have the following shortcomings:

[0004] 1. Use multiple low-voltage cables to connect to the busbar on the low-voltage side of the transformer:

[0005] (1) There are a large number of inverter devices, which requires a large number of low-voltage cables, and the manufacturing process is complex and the workload is large;

[0006] (2) The low-voltage cable channel has a small space and complex shape, making it difficult to bend and fix the cable;

[0007] (3) It is difficult to connect the low-voltage cable on the low-voltage side of the transformer;

[0008] (4) The connection method of low-voltage cables is costly and difficult to maintain.

[0009] 2. Use rectangular busbar to connect to the low voltage side of the transformer:

[0010] (1) The long side and width of the rectangular busbar vary greatly, and its transverse and longitudinal bending strength, mechanical strength, etc. also vary greatly. When the equipment is in normal operation, the working current passing through the three-phase busbar is small, and the electric force generated by the current is small, which has little impact on the rectangular busbar; if the equipment is in an accident state (such as a short circuit fault), the fault current will generally rise to tens of thousands of amperes or more, and the electric force generated between the busbars will be quite large. If the fixing strength of the busbar and its supporting parts is not enough, it is easy to damage its supporting parts, causing a larger secondary accident;

[0011] (2) The fixing method of the rectangular busbar requires opening mounting holes, which increases the manufacturing difficulty, reduces the current carrying capacity of the rectangular busbar, and causes heat;

[0012] (3) The safety protection of the three-phase busbar is difficult and maintenance is not convenient. Summary of the invention

[0013] The purpose of the present invention is to overcome the defects of the prior art and provide a T-shaped busbar device at the bottom of the inverter cabinet in a prefabricated substation, which is simple and reliable to assemble, stable in operation and has a large current carrying capacity. An inverter cabinet of a prefabricated substation including the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation is also provided, which has a simple structure, is easy and reliable to assemble, has a high structural strength and has a large current carrying capacity.

[0014] To achieve the above object, the present invention adopts the following technical solutions:

[0015] A T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation includes a T-shaped busbar 7, a busbar fixing structure 6 and a mounting bracket 8. The cross section of the T-shaped busbar 7 is a T-shaped structure, including a busbar vertical portion 70 and a busbar horizontal portion 71 connected to the busbar vertical portion 70. The busbar vertical portion 70 is connected to at least one rectangular busbar 2. The busbar fixing structure 6 includes a T-shaped slot 60 arranged thereon. The T-shaped busbar 7 is inserted into the T-shaped slot 60. The busbar fixing structure 6 is fixedly arranged by the mounting bracket 8.

[0016] Preferably, the T-shaped slot 60 includes a slot horizontal portion 600 and a slot vertical portion 601, the busbar horizontal portion 71 is inserted into the slot horizontal portion 600 and the busbar vertical portion 70 is inserted into the slot vertical portion 601, the busbar fixing structure 6 also includes a busbar fastener 50, and a busbar fastener 50 is provided on each side of the slot vertical portion 601, and the busbar fastener 50 presses the busbar horizontal portion 71 into the slot horizontal portion 600.

[0017] Preferably, the busbar fixing structure 6 also includes an insert 61, an insert 61 is provided on each side of the vertical portion 601 of the slot, the insert 61 includes an insert threaded hole 610 arranged in the middle thereof, the busbar fastener 50 is a busbar fastening screw, the busbar fastening screw is threadedly connected to the insert 61, and the two busbar fastening screws respectively press the two ends of the busbar horizontal portion 71.

[0018] Preferably, the insert 61 is in a dumbbell shape as a whole, and includes insert ends 612 respectively arranged at its two ends, an insert connecting portion 613 arranged between the two insert ends 612, and an insert threaded hole 610 axially arranged in the middle of the insert 61, the two ends of the insert connecting portion 613 are respectively connected to the two insert ends 612, the insert end 612 is a polygonal column structure, and an annular groove 611 is provided between the two insert ends 612 and on the outside of the insert connecting portion 613.

[0019] Preferably, the mounting bracket 8 is a U-shaped structure, the busbar fixing structure 6 is arranged at the bottom of the U-shaped structure of the mounting bracket 8, and the two ends of the busbar fixing structure 6 are respectively connected to the two arms of the U-shaped structure of the mounting bracket 8, and the two arms of the U-shaped structure of the mounting bracket 8 are fixedly arranged.

[0020] Preferably, two ends of the busbar fixing structure 6 are connected to two arms of the U-shaped structure of the mounting bracket 8 through connecting pieces 51 respectively.

[0021] Preferably, an embedding piece 61 is respectively provided at both ends of the busbar fixing structure 6 , and the connecting piece 51 is a connecting screw threadedly connected to the embedding piece 61 .

[0022] Preferably, the mounting bracket 8 includes a bracket base plate 80 and a bracket arm, the two bracket arms are respectively arranged at both ends of the bracket base plate 80, each bracket arm includes a bracket arm first plate 81, a bracket arm second plate 82 and a bracket arm third plate 83, the bracket arm first plate 81 is bent and connected to the bracket base plate 80, one end of the bracket arm second plate 82 is bent and connected to the bracket arm first plate 81, and the other end is bent and connected to the bracket arm third plate 83, and the bracket arm third plate 83 is parallel to the bracket arm first plate 81;

[0023] The two support arm first plates 81 are respectively connected to two ends of the busbar fixing structure 6 , and the two support arm third plates 83 are fixedly arranged.

[0024] Preferably, the T-shaped busbar 7 also includes a first connecting hole 72 arranged on the busbar vertical portion 70, and a second connecting hole is provided at one end of the rectangular busbar 2. The connecting screw 1 fixes the rectangular busbar 2 to the busbar vertical portion 70 through the first connecting hole 72 and the second connecting hole; the busbar vertical portion 70 has the same thickness as the busbar horizontal portion 71.

[0025] Preferably, it includes multiple T-shaped busbars 7 arranged in parallel, multiple busbar fixing structures 6 and multiple mounting brackets 8, each busbar fixing structure 6 is provided with multiple T-shaped slots 60 side by side, each T-shaped busbar 7 is inserted into the T-shaped slots 60 of the multiple busbar fixing structures 6, and each T-shaped busbar 7 is connected to at least one rectangular busbar 2, and a busbar fixing structure 6 is provided at each end of each mounting bracket 8.

[0026] An inverter cabinet of a prefabricated substation comprises a T-shaped busbar device at the bottom of an inverter cabinet in any prefabricated substation.

[0027] Preferably, it also includes an inverter cabinet 3 and a base 9, the base 9 is arranged below the inverter cabinet 3 and connected thereto, and the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation is arranged in the base 9 and fixedly connected to the base 9 through the mounting bracket 8.

[0028] The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention comprises a T-shaped busbar, a busbar fixing structure and a mounting bracket. Compared with a rectangular busbar with the same cross-sectional area, the T-shaped busbar has a larger surface area, faster heat dissipation and a larger current carrying capacity. Furthermore, the cross-section of the T-shaped busbar is a T-shaped structure, which significantly improves its lateral and longitudinal bending strength and mechanical strength, and can withstand the action of large electric forces in multiple directions that appear when the line is tested for fault current (short-circuit current), avoiding the occurrence of secondary accidents caused by insufficient strength of the busbar itself. The busbar fixing structure comprises a T-shaped slot, and the T-shaped busbar is inserted into the T-shaped slot. The busbar fixing structure is fixed by the mounting bracket, which significantly improves the assembly efficiency of the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention, and ensures the reliability of the T-shaped busbar assembly. The inverter cabinet of the prefabricated substation of the present invention includes a T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation, which can significantly improve production and assembly efficiency and ensure the personal safety of operators during maintenance and operation and the reliable operation of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation of the present invention, and it also shows an assembly structure of the T-shaped busbar device at the bottom of an inverter cabinet in the prefabricated substation and an inverter cabinet of the prefabricated substation;

[0030] Figure 2 It is a schematic diagram of the structure of a T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention from a top view;

[0031] Figure 3 It is a structural schematic diagram of the busbar fixing structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the embedding part of the present invention;

[0033] Figure 5 is another structural schematic diagram of the embedding part of the present invention;

[0034] Figure 6 It is a schematic structural diagram of a T-shaped busbar of the present invention;

[0035] Figure 7 It is a structural schematic diagram of the mounting bracket of the present invention;

[0036] Figure 8 It is another structural schematic diagram of the mounting bracket of the present invention. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-8 The given embodiments further illustrate the specific implementation of the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention is not limited to the description of the following embodiments.

[0038] The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention includes a T-shaped busbar 7, a busbar fixing structure 6 and a mounting bracket 8. The cross-section of the T-shaped busbar 7 is a T-shaped structure, which includes a busbar vertical portion 70 and a busbar horizontal portion 71 connected to the busbar vertical portion 70. The busbar vertical portion 70 is connected to at least one rectangular busbar 2. The busbar fixing structure 6 includes a T-shaped slot 60 arranged thereon. The T-shaped busbar 7 is inserted into the T-shaped slot 60. The busbar fixing structure 6 is fixed by the mounting bracket 8.

[0039] The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention comprises a T-shaped busbar 7, a busbar fixing structure 6 and a mounting bracket 8. Compared with a rectangular busbar of the same cross-sectional area, the T-shaped busbar 7 has a larger surface area, faster heat dissipation and a larger current carrying capacity. Furthermore, the cross-section of the T-shaped busbar 7 is a T-shaped structure, which significantly improves its lateral and longitudinal bending strength and mechanical strength, and can withstand the action of large electric forces in multiple directions that occur when the line is tested for fault current (short-circuit current), avoiding the occurrence of secondary accidents caused by insufficient strength of the busbar itself. The busbar fixing structure 6 comprises a T-shaped slot 60, and the T-shaped busbar 7 is inserted into the T-shaped slot 60. The busbar fixing structure 6 is fixedly arranged by the mounting bracket 8, which significantly improves the assembly efficiency of the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention, and ensures the reliability of the assembly of the T-shaped busbar 7.

[0040] like Figure 1-8FIG. 1 is an embodiment of a T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation of the present invention.

[0041] like Figure 1-3 As shown in FIG. 6 , the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention includes a T-shaped busbar 7, a busbar fixing structure 6 and a mounting bracket 8. The cross section of the T-shaped busbar 7 is a T-shaped structure, which includes a busbar vertical portion 70 and a busbar horizontal portion 71 connected to the busbar vertical portion 70. The busbar vertical portion 70 is connected to at least one rectangular busbar 2. The busbar fixing structure 6 includes a T-shaped slot 60 arranged thereon. The T-shaped busbar 7 is inserted into the T-shaped slot 60. The busbar fixing structure 6 is fixedly arranged by the mounting bracket 8. Specifically, as shown in FIG. Figure 1 In the direction shown, the lower end of the rectangular busbar 2 is connected to the upper end of the busbar vertical portion 70, the T-shaped busbar 7 is invertedly inserted into the inverted T-shaped slot 60 of the busbar fixing structure 6, and the two ends of the busbar fixing structure 6 are respectively connected to the mounting bracket 8, and the mounting bracket 8 is fixedly arranged.

[0042] Preferably, the main body of the busbar fixing structure 6 is made of insulating material.

[0043] Preferably, Figure 1 and 3 As shown, the T-shaped slot 60 includes a slot horizontal portion 600 and a slot vertical portion 601, the busbar horizontal portion 71 is inserted into the slot horizontal portion 600 and the busbar vertical portion 70 is inserted into the slot vertical portion 601, the busbar fixing structure 6 also includes a busbar fastener 50, and a busbar fastener 50 is provided on each side of the slot vertical portion 601, and the busbar fastener 50 presses the busbar horizontal portion 71 into the slot horizontal portion 600. Specifically, as Figure 1 and 3 In the direction shown, two busbar fasteners 50 are arranged on both sides of the vertical portion 601 of the slot, corresponding to the two ends of the horizontal portion 600 of the slot respectively. The two busbar fasteners 500 are connected to the busbar fixing structure 6, and the lower ends respectively press the two ends of the busbar horizontal portion 71 to ensure that the T-shaped busbar 7 is reliably and stably inserted into the T-shaped slot of the busbar fixing structure 6. The assembly and fixing operations are simple, which significantly improves the assembly efficiency.

[0044] Preferably, Figure 3As shown, the busbar fixing structure 6 also includes an insert 61, and an insert 61 is provided on each side of the slot vertical portion 601. The insert 61 includes an insert threaded hole 610 arranged in the middle thereof. The busbar fastener 50 is a busbar fastening screw, and the busbar fastening screw is threadedly connected to the insert 61, and the two busbar fastening screws respectively press the two ends of the busbar horizontal portion 71. The busbar fastener 50 cooperates with the insert 61 to increase the pressure of the busbar fastener 50 on the busbar horizontal portion 71, and prevents the busbar fastener 50 from slipping or detaching from the busbar fixing structure 6 bracket due to excessive screwing, long-term use or high temperature, which is beneficial to increase the service life of the busbar fixing structure 6.

[0045] Preferably, Figure 3-5 As shown, the insert 61 is in a dumbbell shape as a whole, and includes an insert end 612 respectively arranged at its two ends, an insert connection portion 613 arranged between the two insert ends 612, and an insert threaded hole 610 axially arranged in the middle of the insert 61. The two ends of the insert connection portion 613 are respectively connected to the two insert ends 612. The insert end 612 is a polygonal column structure, and an annular groove 611 is provided between the two insert ends 612 and on the outside of the insert connection portion 613. The insert end 612 is a polygonal column, which can prevent the insert 61 and the busbar fixing structure 6 from sliding relative to each other, and the busbar fastener 50 cannot be tightened. The annular groove 611 can prevent the insert 61 from being pulled out or ejected. Preferably, the insert 61 is made of metal material, such as steel.

[0046] Preferably, Figure 1 As shown, the mounting bracket 8 is a U-shaped structure, the busbar fixing structure 6 is arranged at the bottom of the U-shaped structure of the mounting bracket 8, and the two ends of the busbar fixing structure 6 are respectively connected to the two arms of the U-shaped structure of the mounting bracket 8, and the two arms of the U-shaped structure of the mounting bracket 8 are fixedly arranged. Figure 1 As shown, the left and right ends of the busbar fixing structure 6 are respectively connected to the lower ends of the left arm and the right arm of the U-shaped structure of the mounting bracket 8, and the upper ends of the left arm and the right arm of the mounting bracket 8 are respectively fixed. The mounting bracket 8 and the busbar fixing structure 6 have a simple assembly structure, high assembly efficiency, and easy operation. The busbar fixing structure 6 can be reliably assembled by the mounting bracket 8. Further, as Figure 1 As shown, the two ends of the busbar fixing structure 6 are connected to the two arms of the U-shaped structure of the mounting bracket 8 through the connecting piece 51. Figure 1 As shown, an embedding piece 61 is respectively provided at both ends of the busbar fixing structure 6 , and the connecting piece 51 is a connecting screw which is threadedly connected to the embedding piece 61 .

[0047] Preferably, Figure 7 and8 As shown, the mounting bracket 8 is a U-shaped structure, which includes a bracket base plate 80 and a bracket arm. Two bracket arms are respectively arranged at the two ends of the bracket base plate 80. Each bracket arm includes a bracket arm first plate 81, a bracket arm second plate 82 and a bracket arm third plate 83. The bracket arm first plate 81 is connected to the bracket base plate 80 by bending, one end of the bracket arm second plate 82 is connected to the bracket arm first plate 81 by bending, and the other end is connected to the bracket arm third plate 83 by bending, and the bracket arm third plate 83 is parallel to the bracket arm first plate 81; the two bracket arm first plates 81 are respectively connected to the two ends of the busbar fixing structure 6, and the two bracket arm third plates 83 are fixedly arranged. Further, the bracket arm first plate 81 is connected to the bracket base plate 80 at a right angle, the bracket arm second plate 82 is respectively connected to the bracket arm first plate 81 and the bracket arm third plate 83 at a right angle, and the bracket arm second plate 82 is bent in a direction away from the bracket base plate 80. Furthermore, the support base plate 80 and the two support arms enclose an inverted “convex” shaped space with an open upper end for assembling the busbar fixing structure 6 .

[0048] like Figure 1 and 6 As shown, the T-shaped busbar 7 further includes a first connection hole 72 provided on the busbar vertical portion 70, a second connection hole (not shown in the figure) is provided at one end of the rectangular busbar 2, and the connection screw 1 is fixedly connected to the rectangular busbar 2 and the busbar vertical portion 70 through the first connection hole 72 and the second connection hole. It should be pointed out that the first connection hole 72 on the busbar vertical portion 70 can be increased as needed, and the rectangular busbars 2 connected to the busbar vertical portion 70 can also be increased as needed.

[0049] Preferably, the T-shaped busbar 7 has the same thickness as the busbar vertical portion 70 and the busbar horizontal portion 71. Figure 1 As shown, the thickness of the busbar vertical portion 70 is t1, the thickness of the busbar horizontal portion 71 is t2, t1=t2 and both t1 and t2 are greater than 0. Figure 1 As shown, the free end (i.e., the top end) of the busbar vertical portion 70 is not provided with a wedge-shaped structure. Figure 1 As shown, no chamfer structure of any kind is provided on the top of the busbar vertical portion 70 .

[0050] like Figure 1-2 As shown, another embodiment of the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention is shown. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation may include a plurality of T-shaped busbars 7 arranged in parallel.

[0051] The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of the present invention is different from the above-mentioned embodiment in that:

[0052] The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation of this embodiment includes multiple parallel T-shaped busbars 7, multiple busbar fixing structures 6 and multiple mounting brackets 8. Each busbar fixing structure 6 is provided with multiple T-shaped slots 60 in parallel. Each T-shaped busbar 7 is inserted into the T-shaped slots 60 of the multiple busbar fixing structures 6. Each T-shaped busbar 7 is connected to at least one rectangular busbar 2. Each mounting bracket 8 has a busbar fixing structure 6 at both ends. Multiple mounting brackets 8 are arranged side by side. Specifically, Figure 2 In the direction shown, multiple T-shaped busbars 7 are arranged side by side from left to right and are spaced apart from each other, multiple busbar fixing structures 6 are arranged side by side along the length direction of the T-shaped busbar 7 and are spaced apart from each other, and multiple mounting brackets 8 are arranged side by side along the length direction of the T-shaped busbar 7 and are spaced apart from each other.

[0053] Preferably, Figure 8 As shown, a third connecting hole 810 is provided at both ends of the first plate 81 of the bracket arm of each mounting bracket 8, and the connecting piece 51 is connected to the busbar fixing structure 6 through the third connecting hole 810. A fourth connecting hole 820 is provided at both ends of the third plate 83 of the bracket arm of each mounting bracket 8, and the mounting bracket 8 is fixedly set through the fourth connecting hole 820.

[0054] like Figure 1 and 2 As shown, the present invention further discloses an inverter cabinet of a prefabricated substation, which comprises a T-shaped busbar device at the bottom of the inverter cabinet in any of the above-mentioned prefabricated substations.

[0055] Preferably, the inverter cabinet of the prefabricated substation of the present invention further includes an inverter cabinet 3 and a base 9, the base 9 is arranged below the inverter cabinet 3 and connected thereto, the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation is arranged in the base 9, and is fixedly connected to the base 9 through the mounting bracket 8 by fixing screws 4, one end of the rectangular busbar 2 is connected to the T-shaped busbar 7 of the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation, and the other end is connected to the inverter.

[0056] The T-shaped busbar device at the bottom of the inverter cabinet in the modular prefabricated substation of the present invention is modularly produced according to the cabinet width of the inverter cabinet, which can improve the production and assembly efficiency. The inverter cabinet of the prefabricated substation of the present invention includes the T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation, which ensures the personal safety of operators during maintenance and operation and the reliable operation of equipment.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation, characterized in that: It comprises a T-shaped busbar (7), a busbar fixing structure (6) and a mounting bracket (8); the cross section of the T-shaped busbar (7) is a T-shaped structure, comprising a busbar vertical portion (70) and a busbar horizontal portion (71) connected to the busbar vertical portion (70); the busbar vertical portion (70) is connected to at least one rectangular busbar (2); the busbar fixing structure (6) comprises a main body and a T-shaped slot (60) arranged on the main body; the T-shaped busbar (7) is inserted into the T-shaped slot (60); and the busbar fixing structure (6) is fixedly arranged by the mounting bracket (8); The T-shaped slot (60) comprises a slot horizontal portion (600) and a slot vertical portion (601), the busbar horizontal portion (71) is inserted into the slot horizontal portion (600) and the busbar vertical portion (70) is inserted into the slot vertical portion (601), the busbar fixing structure (6) further comprises a busbar fastener (50), a busbar fastener (50) is provided on each side of the slot vertical portion (601), the busbar fastener (50) presses the busbar horizontal portion (71) into the slot horizontal portion (600), the two busbar fasteners (50) are connected to the busbar fixing structure (6) and the lower ends thereof respectively press the two ends of the busbar horizontal portion (71); The mounting bracket (8) is a U-shaped structure, the busbar fixing structure (6) is arranged at the bottom of the U-shaped structure of the mounting bracket (8), and the two ends of the busbar fixing structure (6) are respectively connected to the two arms of the U-shaped structure of the mounting bracket (8), and the two arms of the U-shaped structure of the mounting bracket (8) are fixedly arranged; the two ends of the busbar fixing structure (6) are respectively connected to the two arms of the U-shaped structure of the mounting bracket (8) through connecting pieces (51); the mounting bracket (8) comprises a bracket bottom plate (80) and bracket arms, and the two bracket arms are respectively arranged on the two ends of the bracket bottom plate (80). The support arms are connected to the support base plate (80) by bending, and each support arm comprises a support arm first plate (81), a support arm second plate (82) and a support arm third plate (83); the support arm first plate (81) is connected to the support base plate (80) by bending, one end of the support arm second plate (82) is connected to the support arm first plate (81) by bending, and the other end is connected to the support arm third plate (83) by bending, and the support arm third plate (83) is parallel to the support arm first plate (81); the two support arm first plates (81) are respectively connected to the two ends of the busbar fixing structure (6), and the two support arm third plates (83) are fixedly arranged.

2. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation according to claim 1 is characterized in that: The busbar fixing structure (6) further comprises an embedding piece (61), wherein an embedding piece (61) is respectively provided on both sides of the vertical portion (601) of the slot, the embedding piece (61) comprises an embedding piece threaded hole (610) arranged in the middle thereof, and the busbar fastening piece (50) is a busbar fastening screw, the busbar fastening screw is threadably connected to the embedding piece (61), and the two busbar fastening screws respectively press the two ends of the busbar horizontal portion (71).

3. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation according to claim 2 is characterized in that: The insert (61) is in a dumbbell shape as a whole, and comprises insert end portions (612) respectively arranged at both ends thereof, an insert connection portion (613) arranged between the two insert end portions (612), and an insert threaded hole (610) axially arranged in the middle of the insert (61), the two ends of the insert connection portion (613) are respectively connected to the two insert end portions (612), the insert end portion (612) is a polygonal columnar structure, and an annular groove (611) is provided between the two insert end portions (612) and on the outside of the insert connection portion (613).

4. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation according to claim 1 is characterized in that: An embedding piece (61) is respectively provided at both ends of the busbar fixing structure (6), and the connecting piece (51) is a connecting screw which is threadedly connected to the embedding piece (61).

5. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation according to claim 1 is characterized in that: The T-shaped busbar (7) further comprises a first connection hole (72) arranged on the busbar vertical portion (70); a second connection hole is arranged at one end of the rectangular busbar (2); a connection screw (1) is used to fixedly connect the rectangular busbar (2) and the busbar vertical portion (70) through the first connection hole (72) and the second connection hole; the busbar vertical portion (70) and the busbar horizontal portion (71) have the same thickness.

6. The T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation according to claim 1, characterized in that: The invention comprises a plurality of T-shaped busbars (7) arranged in parallel, a plurality of busbar fixing structures (6) and a plurality of mounting brackets (8), wherein each busbar fixing structure (6) is provided with a plurality of T-shaped slots (60) arranged in parallel, each T-shaped busbar (7) is inserted into the T-shaped slots (60) of the plurality of busbar fixing structures (6), and each T-shaped busbar (7) is connected to at least one rectangular busbar (2), and each mounting bracket (8) is provided with a busbar fixing structure (6) at both ends.

7. An inverter cabinet for a prefabricated substation, characterized in that: It comprises a T-shaped busbar device at the bottom of an inverter cabinet in a prefabricated substation according to any one of claims 1-6.

8. The inverter cabinet of the prefabricated substation according to claim 7, characterized in that: It also includes an inverter cabinet (3) and a base (9), wherein the base (9) is arranged below the inverter cabinet (3) and connected thereto, and a T-shaped busbar device at the bottom of the inverter cabinet in the prefabricated substation is arranged in the base (9) and fixedly connected to the base (9) via a mounting bracket (8).

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