Lead structure and box-type transformer suitable for low voltage and large current

Abstract

The utility model relates to box type transformer technical field, especially suitable for low voltage large current's lead structure and box type transformer, including leading out row subassembly and low pressure bushing subassembly, low pressure bushing subassembly sets up in the side of leading out row subassembly, the one end of first soft row and the one end of second soft row are connected with A phase transition row, and the other end of first soft row and the other end of second soft row are connected with two first bushings respectively, the one end of third soft row and the one end of fourth soft row are connected with B phase transition row, and the other end of third soft row and the other end of fourth soft row are connected with two second bushings respectively, the utility model has realized the shunt of large current, makes the current that flows through each bushing all less than respective rated current, can effectively avoid bushing overheat damage and influence the normal operation of box type transformer condition, solved the existing lead structure not suitable for low voltage large current's working condition, cannot guarantee the problem that large capacity box type transformer safely and stably operates.

Description

Technical Field

[0001] This utility model relates to the field of box-type transformer technology, and in particular to a lead structure and box-type transformer suitable for low voltage and high current. Background Technology

[0002] In box-type transformers, the low-voltage side typically uses a Y-connection. The first row of the low-voltage coil is connected to the low-voltage bushing via a lead-out terminal to achieve electrical continuity. The location of the low-voltage bushing depends on customer requirements; it generally extends from the short side wall of the transformer enclosure and connects to the external circuit. Under normal circumstances, a 5140kVA box-type transformer has a low-voltage side voltage of 0.69kV, at which point the rated current on the low-voltage side is 4300A. This means that the current flowing through the outlet and the low-voltage bushing will reach 4300A. In order to ensure the safe and stable operation of the low-voltage bushing under rated load, the rated current of the low-voltage bushing should be greater than the rated current of the low-voltage side. In this case, a low-voltage bushing with a rated current of 5500A can meet the requirements.

[0003] However, for larger-capacity box-type transformers, such as those with a capacity of 6750kVA, if the existing lead structure is used, the rated current on the low-voltage side will reach 5648A, exceeding the rated current of the low-voltage bushing, assuming the low-voltage side voltage remains constant. If this large current flows through the low-voltage bushing, prolonged operation will cause a significant accumulation of heat, leading to overheating and damage, thus affecting the normal operation of the transformer. Therefore, the existing lead structure is unsuitable for low-voltage, high-current operating conditions and cannot guarantee the safe and stable operation of large-capacity box-type transformers. Furthermore, the high current flow will cause the temperature of the box-type transformer to rise, and the existing heat dissipation performance is poor, failing to dissipate heat effectively, ultimately shortening the transformer's lifespan. Utility Model Content

[0004] The main purpose of this utility model is to provide a lead structure suitable for low voltage and high current, which realizes the shunting of high current, so that the current flowing through each first bushing, each second bushing and each third bushing is less than their respective rated current. This can effectively avoid the bushing overheating and damage, which would affect the normal operation of the box-type transformer. It solves the problem that the existing lead structure is not suitable for low voltage and high current conditions and cannot guarantee the safe and stable operation of large-capacity box-type transformers.

[0005] Another objective of this invention is to provide a box-type transformer, including the aforementioned lead structure, which achieves current shunting, ensuring that the current flowing through each first bushing, each second bushing, and each third bushing is less than their respective rated current. This effectively avoids bushing overheating and damage that could affect the normal operation of the box-type transformer, and solves the problem that existing lead structures are not suitable for low-voltage, high-current conditions and cannot guarantee the safe and stable operation of large-capacity box-type transformers.

[0006] To achieve the above objectives, the present invention proposes a lead structure suitable for low voltage and high current, including a lead-out assembly and a low-voltage bushing assembly; the low-voltage bushing assembly is disposed on one side of the lead-out assembly;

[0007] The lead-out bus assembly includes a connecting bus, an A-phase transition bus, a B-phase transition bus, a C-phase transition bus, a first soft bus and a second soft bus arranged opposite to each other, a third soft bus and a fourth soft bus arranged opposite to each other, and a fifth soft bus and a sixth soft bus arranged opposite to each other.

[0008] The connecting bar is used to connect the tail rows of three low-voltage coils; the A-phase transition bar, the B-phase transition bar, and the C-phase transition bar are respectively used to connect the first row of one of the low-voltage coils;

[0009] The low-pressure bushing assembly includes two first bushings, two second bushings, and two third bushings;

[0010] One end of the first flexible busbar and one end of the second flexible busbar are connected to the A-phase transition busbar, and the other ends of the first flexible busbar and the second flexible busbar are respectively connected to two first sleeves; one end of the third flexible busbar and one end of the fourth flexible busbar are connected to the B-phase transition busbar, and the other ends of the third flexible busbar and the fourth flexible busbar are respectively connected to two second sleeves; one end of the fifth flexible busbar and one end of the sixth flexible busbar are connected to the C-phase transition busbar, and the other ends of the fifth flexible busbar and the sixth flexible busbar are respectively connected to two third sleeves.

[0011] Optionally, one end of the A-phase transition row along its length, one end of the B-phase transition row along its length, and one end of the C-phase transition row along its length are respectively connected to the first row of one of the low-voltage coils;

[0012] The other end of the A-phase transition busbar along its length is perpendicularly connected to the first flexible busbar and the second flexible busbar; the end of the first flexible busbar away from the A-phase transition busbar and the end of the second flexible busbar away from the A-phase transition busbar are respectively connected to the two first sleeves;

[0013] The other end of the B-phase transition busbar along its length is perpendicularly connected to the third and fourth flexible busbars; the end of the third flexible busbar away from the B-phase transition busbar and the end of the fourth flexible busbar away from the B-phase transition busbar are respectively connected to the two second sleeves;

[0014] The other end of the C-phase transition busbar along its length is perpendicularly connected to the fifth and sixth flexible busbars; the end of the fifth flexible busbar away from the C-phase transition busbar and the end of the sixth flexible busbar away from the C-phase transition busbar are respectively connected to the two third sleeves;

[0015] Furthermore, the first soft board, the second soft board, the third soft board, the fourth soft board, the fifth soft board, and the sixth soft board all extend upward in a vertical direction.

[0016] Optionally, two first sleeves are sandwiched between the first flexible busbar and the second flexible busbar, and the two first sleeves are spaced apart and arranged in parallel along the vertical direction;

[0017] Two second sleeves are sandwiched between the third flexible busbar and the fourth flexible busbar, and the two second sleeves are spaced apart and parallel to each other in the vertical direction;

[0018] The two third sleeves are sandwiched between the fifth flexible busbar and the sixth flexible busbar, and the two third sleeves are spaced apart and arranged in parallel along the vertical direction;

[0019] The first sleeve, the second sleeve, and the third sleeve are arranged in a row.

[0020] Optionally, the first flexible busbar includes a first L-shaped section and a first extension section, and the second flexible busbar includes a second L-shaped section and a second extension section. One end of the first L-shaped section and one end of the second L-shaped section are both connected to the A-phase transition busbar. The other end of the first L-shaped section is perpendicularly connected to the first extension section, and the other end of the second L-shaped section is perpendicularly connected to the second extension section. Two first sleeves are disposed between the first extension section and the second extension section.

[0021] The third flexible busbar includes a third L-shaped section and a third extension section, and the fourth flexible busbar includes a fourth L-shaped section and a fourth extension section. One end of the third L-shaped section and one end of the fourth L-shaped section are both connected to the B-phase transition busbar. The other end of the third L-shaped section is perpendicularly connected to the third extension section, and the other end of the fourth L-shaped section is perpendicularly connected to the fourth extension section. Two second sleeves are disposed between the third extension section and the fourth extension section.

[0022] The fifth flexible busbar includes a fifth L-shaped section and a fifth extension section, and the sixth flexible busbar includes a sixth L-shaped section and a sixth extension section. One end of the fifth L-shaped section and one end of the sixth L-shaped section are both connected to the C-phase transition busbar. The other end of the fifth L-shaped section is perpendicularly connected to the fifth extension section, and the other end of the sixth L-shaped section is perpendicularly connected to the sixth extension section. Two third sleeves are disposed between the fifth extension section and the sixth extension section.

[0023] Furthermore, the first L-shaped segment, the second L-shaped segment, the third L-shaped segment, the fourth L-shaped segment, the fifth L-shaped segment, and the sixth L-shaped segment are parallel to each other.

[0024] Optionally, the lead structure further includes a first insulating component;

[0025] The A-phase transition busbar, the B-phase transition busbar, and the C-phase transition busbar are fixedly connected by the first insulating component;

[0026] The connecting bar, the B-phase transition bar, and the C-phase transition bar are fixedly connected by the first insulating component;

[0027] The connecting bar and the C-phase transition bar are fixedly connected by the first insulating component.

[0028] Optionally, the lead structure further includes a second insulation component and a third insulation component;

[0029] The first L-shaped segment, the second L-shaped segment, the third L-shaped segment, and the fourth L-shaped segment are fixedly connected by a second insulating component;

[0030] The third L-shaped segment, the fourth L-shaped segment, the fifth L-shaped segment, and the sixth L-shaped segment are fixedly connected by another second insulating component;

[0031] The first extension segment, the second extension segment, the third extension segment, the fourth extension segment, the fifth extension segment, and the sixth extension segment are fixedly connected by the third insulating component.

[0032] This utility model also proposes a box-type transformer, including a box body, a heat dissipation assembly, several sets of heat sinks, and the lead structure described in any one of the above.

[0033] Several groups of radiators are disposed on the long side wall of the housing and are arranged at intervals along the length of the housing. The heat dissipation assembly is disposed on the top of the several groups of radiators. The heat dissipation assembly includes a first fixing plate, a first connecting rod and several fans.

[0034] Several first fixing plates are fixed to the top of the radiator, and the first connecting rod spans across the top of several groups of radiators, and the first connecting rod is detachably connected to several first fixing plates; the fans are detachably connected to one of the first connecting rods at both ends along the width direction of the housing, and several fans are spaced apart along the arrangement direction of several groups of radiators to draw air and dissipate heat from several groups of radiators.

[0035] The lead wire structure is disposed inside the housing, and one end of the first sleeve, one end of the second sleeve, and one end of the third sleeve all pass through the short side wall of the housing and are located outside the housing.

[0036] Optionally, the short side wall of the enclosure is provided with a hand hole and six mounting ports. The hand hole is located at the lower part of the short side wall of the enclosure and is used to install the A-phase transition busbar, the first flexible busbar, and the second flexible busbar; the B-phase transition busbar, the third flexible busbar, and the fourth flexible busbar; and the C-phase transition busbar, the fifth flexible busbar, and the sixth flexible busbar. The short side wall of the enclosure is also provided with a cover plate, which is detachably connected to the enclosure and is used to cover the hand hole. The six mounting ports are used for two first sleeves, two second sleeves, and two third sleeves to pass through the short side wall of the enclosure.

[0037] Optionally, the box-type transformer further includes a second connecting rod, several second fixing plates, and several support components;

[0038] Several second fixing plates are respectively fixed to the bottom ends of several groups of heat sinks, and the second connecting rod spans across the bottom of several groups of heat sinks, and the second connecting rod is detachably connected to several second fixing plates; the support assembly is detachably connected to the second connecting rod, and several support assemblies are respectively spaced along the length direction of the second connecting rod, and the several support assemblies are used to support several groups of heat sinks.

[0039] Optionally, the support assembly includes a support plate, a buffer pad, a plurality of third studs, and a plurality of fourth nuts;

[0040] The support plate is disposed below the second connecting rod, and one end of the third stud along its length is detachably connected to the second connecting rod via the fourth nut; the other end of the third stud along its length is detachably connected to the support plate via the fourth nut.

[0041] The buffer pad is disposed at the bottom end of the support plate.

[0042] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0043] In this lead structure, the first and second flexible busbars are simultaneously connected to the A-phase transition busbar and two first bushings; the third and fourth flexible busbars are simultaneously connected to the B-phase transition busbar and two second bushings; and the fifth and sixth flexible busbars are simultaneously connected to the C-phase transition busbar and two third bushings. Each phase transition busbar is connected to two flexible busbars, and each of the two flexible busbars is connected to two bushings. Thus, the two first bushings are connected in parallel, the two second bushings are connected in parallel, and the two third bushings are connected in parallel. That is, this lead structure uses six bushings, with the two bushings of each phase connected in parallel. This allows the large current to flow from each phase transition busbar through two flexible busbars into two bushings, achieving current shunting and uniform distribution. As a result, the current flowing through each first bushing, each second bushing, and each third bushing is less than its rated current, effectively preventing bushing overheating and damage that could affect the normal operation of the box-type transformer. Therefore, this lead structure can be used in low-voltage, high-current conditions, ensuring the safe and stable operation of large-capacity box-type transformers. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural diagram of a lead wire structure suitable for connecting a low-voltage, high-current coil according to an embodiment of the present invention.

[0045] Figure 2 This is a schematic diagram of a lead wire structure suitable for connecting a low-voltage, high-current coil according to an embodiment of the present invention.

[0046] Figure 3 This is a side view of a lead structure suitable for low voltage and high current connection with a low voltage coil according to an embodiment of the present invention.

[0047] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0048] Figure 5 This is a rear view of a lead structure suitable for low voltage and high current connection with a low voltage coil according to an embodiment of the present invention.

[0049] Figure 6 This is a schematic diagram of the structure of a box-type transformer according to an embodiment of the present invention;

[0050] Figure 7 This is a structural schematic diagram of a box-type transformer (with a hidden fan) according to an embodiment of the present invention;

[0051] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0052] Figure 9This is a side view of a box-type transformer (hidden cover and low-voltage bushing assembly) according to an embodiment of the present invention;

[0053] Figure 10 for Figure 9 Enlarged view of point C in the middle;

[0054] Figure 11 This is a wiring diagram of existing technology;

[0055] Figure 12 This is a wiring diagram of a lead structure suitable for low voltage and high current according to an embodiment of the present invention.

[0056] In the attached diagram: 1. Lead wire structure; 11. Lead-out busbar assembly; 111. Connecting busbar; 112. Phase A transition busbar; 113. Phase B transition busbar; 114. Phase C transition busbar; 115. First flexible busbar; 1151. First L-shaped segment; 1152. First extension segment; 116. Second flexible busbar; 1161. Second L-shaped segment; 1162. Second extension segment; 117. Third flexible busbar; 1171. Third L-shaped segment; 117 2. Third extension section; 118. Fourth flexible busbar; 1181. Fourth L-shaped section; 1182. Fourth extension section; 119. Fifth flexible busbar; 1191. Fifth L-shaped section; 1192. Fifth extension section; 1110. Sixth flexible busbar; 11101. Sixth L-shaped section; 11102. Sixth extension section; 12. Low-pressure bushing assembly; 121. First bushing; 122. Second bushing; 123. Third bushing; 13. 1. First insulating assembly; 131. Sealing plate; 132. First clamp; 133. First bolt; 134. First nut; 14. Second insulating assembly; 141. Connector; 142. Second clamp; 143. First stud; 144. Second nut; 15. Third insulating assembly; 151. Third clamp; 152. Second stud; 153. Third nut; 2. Housing; 21. Hand hole; 22. Cover plate; 23. Mounting port; 3. Radiator; 4. Heat dissipation assembly; 41. First fixing plate; 42. First connecting rod; 421. Second through hole; 43. Fan; 431. First through hole; 5. Second connecting rod; 6. Second fixing plate; 7. Support assembly; 71. Support plate; 72. Buffer pad; 73. Third stud; 74. Fourth nut; 81. Phase A low-voltage coil; 82. Phase B low-voltage coil; 83. Phase C low-voltage coil. Detailed Implementation

[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0058] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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 indicator will also change accordingly.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" 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 utility model according to the specific circumstances.

[0060] Furthermore, in this utility model, 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, features 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 utility model.

[0061] This invention proposes a lead structure suitable for low voltage and high current.

[0062] In the embodiments of this utility model, such as Figures 1 to 4 As shown, the lead structure suitable for low voltage and high current includes a lead-out assembly 11 and a low-voltage bushing assembly 12; the low-voltage bushing assembly 12 is disposed on one side of the lead-out assembly 11.

[0063] The lead-out bus assembly 11 includes a connecting bus 111, an A-phase transition bus 112, a B-phase transition bus 113, a C-phase transition bus 114, a first soft bus 115 and a second soft bus 116 arranged opposite to each other, a third soft bus 117 and a fourth soft bus 118 arranged opposite to each other, and a fifth soft bus 119 and a sixth soft bus 1110 arranged opposite to each other.

[0064] Connecting bus 111 is used to connect the tail bus of three low-voltage coils; A-phase transition bus 112, B-phase transition bus 113 and C-phase transition bus 114 are used to connect the first bus of one low-voltage coil respectively;

[0065] The low-pressure bushing assembly 12 includes two first bushings 121, two second bushings 122 and two third bushings 123;

[0066] One end of the first flexible busbar 115 and one end of the second flexible busbar 116 are connected to the A-phase transition busbar 112, and the other ends of the first flexible busbar 115 and the second flexible busbar 116 are respectively connected to two first bushings 121; one end of the third flexible busbar 117 and one end of the fourth flexible busbar 118 are connected to the B-phase transition busbar 113, and the other ends of the third flexible busbar 117 and the fourth flexible busbar 118 are respectively connected to two second bushings 122; one end of the fifth flexible busbar 119 and one end of the sixth flexible busbar 1110 are connected to the C-phase transition busbar 114, and the other ends of the fifth flexible busbar 119 and the sixth flexible busbar 1110 are respectively connected to two third bushings 123.

[0067] In this lead structure 1, the first flexible busbar 115 and the second flexible busbar 116 are both simultaneously connected to the A-phase transition busbar 112 and two first sleeves 121; the third flexible busbar 117 and the fourth flexible busbar 118 are both simultaneously connected to the B-phase transition busbar 113 and two second sleeves 122; the fifth flexible busbar 119 and the sixth flexible busbar 1110 are both simultaneously connected to the C-phase transition busbar 114 and two third sleeves 123. Each phase transition busbar in this lead structure 1 is connected to two flexible busbars, and each of the two flexible busbars is connected to two sleeves. Thus, the two first sleeves 121 are connected in parallel, the two second sleeves 122 are connected in parallel, and the two third sleeves 123 are connected in parallel. The bushings 121, 122, and 123 are connected in parallel, meaning that this lead structure 1 uses six bushings. The two bushings of each phase are connected in parallel, so that the large current flows from the transition busbar of each phase through two flexible busbars into the two bushings. This achieves the current splitting of the large current and the uniform distribution of the large current. As a result, the current flowing through each first bushing 121, each second bushing 122, and each third bushing 123 is less than its respective rated current. This can effectively avoid the bushing overheating and damage that would affect the normal operation of the box-type transformer. Therefore, this lead structure 1 can be used in low-voltage, high-current conditions and can ensure the safe and stable operation of large-capacity box-type transformers.

[0068] This invention solves the problem that existing lead wire structures are not suitable for low-voltage, high-current operating conditions, and cannot guarantee the safe and stable operation of large-capacity box-type transformers.

[0069] To further explain, phase A transition row 112 is used to connect the first row of phase A low-voltage coil 81, phase B transition row 113 is used to connect the first row of phase B low-voltage coil 82, and phase C transition row 114 is used to connect the first row of phase C low-voltage coil 83. Viewed from closest to furthest from the three low-voltage coils, the connecting row 111, phase A transition row 112, phase B transition row 113, and phase C transition row 114 are arranged sequentially, with the connecting row 111 located on the innermost side and the phase C transition row 114 on the outermost side.

[0070] like Figure 11 The diagram shown is a wiring schematic of the existing technology using three low-voltage bushings. Figure 12 The diagram shows the wiring principle of this lead structure 1, which uses 6 bushings, with the two bushings of each phase connected in parallel. Phase A transition bus 112 is connected to the first flexible bus 115 and the second flexible bus 116, and both the first flexible bus 115 and the second flexible bus 116 are connected to the two first bushings 121. Phase B transition bus 113 is connected to the third flexible bus 117 and the fourth flexible bus 118, and both the third flexible bus 117 and the fourth flexible bus 118 are connected to the two second bushings 122. Phase C transition bus 114 is connected to the fifth flexible bus 119 and the sixth flexible bus 1110, and both the fifth flexible bus 119 and the sixth flexible bus 1110 are connected to the two third bushings 123.

[0071] Preferably, the first bushing 121, the second bushing 122, and the third bushing 123 adopt the same specifications and dimensions, and the rated current of the first bushing 121, the second bushing 122, and the third bushing 123 is the same.

[0072] like Figure 1 and 2 As shown, in one embodiment of this application, one end of the A-phase transition row 112 along its length, one end of the B-phase transition row 113 along its length, and one end of the C-phase transition row 114 along its length are respectively connected to the first row of a low-voltage coil.

[0073] The other end of the A-phase transition busbar 112 along its length is perpendicularly connected to the first flexible busbar 115 and the second flexible busbar 116; the end of the first flexible busbar 115 away from the A-phase transition busbar 112 and the end of the second flexible busbar 116 away from the A-phase transition busbar 112 are respectively connected to the two first sleeves 121.

[0074] The other end of the B-phase transition bus 113 along its length is perpendicularly connected to the third flexible bus 117 and the fourth flexible bus 118; the end of the third flexible bus 117 away from the B-phase transition bus 113 and the end of the fourth flexible bus 118 away from the B-phase transition bus 113 are respectively connected to the two second sleeves 122.

[0075] The other end of the C-phase transition busbar 114 along its length is perpendicularly connected to the fifth flexible busbar 119 and the sixth flexible busbar 1110; the end of the fifth flexible busbar 119 away from the C-phase transition busbar 114 and the end of the sixth flexible busbar 1110 away from the C-phase transition busbar 114 are respectively connected to the two third sleeves 123.

[0076] Furthermore, the first soft board 115, the second soft board 116, the third soft board 117, the fourth soft board 118, the fifth soft board 119, and the sixth soft board 1110 are all arranged to extend upward in the vertical direction.

[0077] In this lead structure 1, the A-phase transition bus 112 is perpendicularly connected to the first flexible bus 115 and the second flexible bus 116, the B-phase transition bus 113 is perpendicularly connected to the third flexible bus 117 and the fourth flexible bus 118, and the C-phase transition bus 114 is perpendicularly connected to the fifth flexible bus 119 and the sixth flexible bus 1110. Thus, this lead structure 1 is not only suitable for low-voltage and high-current operating conditions, but also forms a compact spatial layout. In addition, this lead structure 1 has the advantage of high installation convenience.

[0078] like Figure 3 As shown, in one embodiment of this application, two first sleeves 121 are sandwiched between the first flexible busbar 115 and the second flexible busbar 116, and the two first sleeves 121 are spaced apart and arranged in parallel along the vertical direction.

[0079] Two second sleeves 122 are sandwiched between the third flexible busbar 117 and the fourth flexible busbar 118, and the two second sleeves 122 are spaced apart and parallel in the vertical direction;

[0080] Two third sleeves 123 are sandwiched between the fifth flexible busbar 119 and the sixth flexible busbar 1110. The two third sleeves 123 are spaced apart and parallel in the vertical direction.

[0081] The first sleeve 121, the second sleeve 122, and the third sleeve 123 are arranged in a row.

[0082] The above-mentioned structural arrangement not only facilitates the connection of the two first sleeves 121 with the first flexible busbar 115 and the second flexible busbar 116, but also facilitates the connection of the two second sleeves 122 with the third flexible busbar 117 and the fourth flexible busbar 118, and facilitates the connection of the two third sleeves 123 with the fifth flexible busbar 119 and the sixth flexible busbar 1110. It can also form a neat and orderly structure, thereby improving the aesthetics of this lead wire structure 1.

[0083] like Figures 1 to 3As shown, in one embodiment of this application, the first flexible busbar 115 includes a first L-shaped section 1151 and a first extension section 1152, and the second flexible busbar 116 includes a second L-shaped section 1161 and a second extension section 1162. One end of the first L-shaped section 1151 and one end of the second L-shaped section 1161 are both connected to the A-phase transition busbar 112. The other end of the first L-shaped section 1151 is perpendicularly connected to the first extension section 1152, and the other end of the second L-shaped section 1161 is perpendicularly connected to the second extension section 1162. Two first sleeves 121 are disposed between the first extension section 1152 and the second extension section 1162.

[0084] The third flexible busbar 117 includes a third L-shaped section 1171 and a third extension section 1172, and the fourth flexible busbar 118 includes a fourth L-shaped section 1181 and a fourth extension section 1182. One end of the third L-shaped section 1171 and one end of the fourth L-shaped section 1181 are both connected to the B-phase transition busbar 113. The other end of the third L-shaped section 1171 is perpendicularly connected to the third extension section 1172, and the other end of the fourth L-shaped section 1181 is perpendicularly connected to the fourth extension section 1182. Two second sleeves 122 are disposed between the third extension section 1172 and the fourth extension section 1182.

[0085] The fifth flexible busbar 119 includes a fifth L-shaped section 1191 and a fifth extension section 1192, and the sixth flexible busbar 1110 includes a sixth L-shaped section 11101 and a sixth extension section 11102. One end of the fifth L-shaped section 1191 and one end of the sixth L-shaped section 11101 are both connected to the C-phase transition busbar 114. The other end of the fifth L-shaped section 1191 is perpendicularly connected to the fifth extension section 1192, and the other end of the sixth L-shaped section 11101 is perpendicularly connected to the sixth extension section 11102. Two third sleeves 123 are disposed between the fifth extension section 1192 and the sixth extension section 11102.

[0086] Furthermore, the first L-shaped segment 1151, the second L-shaped segment 1161, the third L-shaped segment 1171, the fourth L-shaped segment 1181, the fifth L-shaped segment 1191, and the sixth L-shaped segment 11101 are parallel to each other.

[0087] In this lead wire structure 1, each flexible busbar includes an L-shaped segment and an extension segment, and the L-shaped segment and the extension segment of each flexible busbar are vertically connected. The six L-shaped segments are parallel to each other, and the six extension segments are parallel to each other. In this way, this lead wire structure 1 can not only meet the requirement of low-pressure bushings exiting on the short side, but also form a compact spatial layout and improve the aesthetics of this lead wire structure 1.

[0088] To further clarify, the height of the first L-shaped segment 1151 < the height of the second L-shaped segment 1161 < the height of the third L-shaped segment 1171 < the height of the fourth L-shaped segment 1181 < the height of the fifth L-shaped segment 1191 < the height of the sixth L-shaped segment 11101; the length of the first extension segment 1152 > the length of the second extension segment 1162 > the length of the third extension segment 1172 > the length of the fourth extension segment 1182 > the length of the fifth extension segment 1192 > the length of the sixth extension segment 11102.

[0089] like Figure 1 and 2 As shown, in one embodiment of this application, the lead structure 1 further includes a first insulating component 13;

[0090] The A-phase transition bus 112, the B-phase transition bus 113 and the C-phase transition bus 114 are fixedly connected by the first insulating component 13;

[0091] The connecting bar 111, the B-phase transition bar 113 and the C-phase transition bar 114 are fixedly connected by the first insulating component 13;

[0092] The connecting row 111 and the C-phase transition row 114 are fixedly connected by the first insulating component 13.

[0093] During operation, the box-type transformer will vibrate, causing vibrations in the connecting busbar 111, the A-phase transition busbar 112, the B-phase transition busbar 113, and the C-phase transition busbar 114. To prevent the connecting busbar 111 and the three phase transition busbars from shaking and causing interference between the busbars, a first insulation component 13 is installed to clamp and fix the A-phase transition busbar 112, the B-phase transition busbar 113, and the C-phase transition busbar 114, the B-phase transition busbar 113 and the C-phase transition busbar 114, and the connecting busbar 111 and the C-phase transition busbar 114. This can improve the mechanical strength of this lead structure 1 and ensure that the box-type transformer can operate safely and stably.

[0094] like Figure 4As shown, in one embodiment of this utility model, the first insulating component 13 includes a sealing plate 131, a plurality of first clamps 132, a plurality of first bolts 133, and a plurality of first nuts 134. The first clamps 132 are used for the connecting row 111, the A-phase transition row 112, the B-phase transition row 113, or the C-phase transition row 114 to pass through. The head of the first bolt 133 is located on one side of the sealing plate 131. The shank of the first bolt 133 passes through the sealing plate 131 and the plurality of first clamps 132 in sequence and is threadedly connected to the nut. By setting the first insulating component 13, the A-phase transition row 112, the B-phase transition row 113, and the C-phase transition row 114 can be fixedly connected, or the connecting row 111 and the C-phase transition row 114 can be fixedly connected, thereby playing a clamping and fixing role for the connecting row 111, the A-phase transition row 112, the B-phase transition row 113, and the C-phase transition row 114.

[0095] Preferably, both the sealing plate 131 and the first clamp 132 are made of laminated wood.

[0096] like Figure 1 , 3 As shown in Figure 5, in one embodiment of this application, the lead structure 1 further includes a second insulating component 14 and a third insulating component 15;

[0097] The first L-shaped segment 1151, the second L-shaped segment 1161, the third L-shaped segment 1171 and the fourth L-shaped segment 1181 are fixedly connected by a second insulating component 14;

[0098] The third L-shaped segment 1171, the fourth L-shaped segment 1181, the fifth L-shaped segment 1191 and the sixth L-shaped segment 11101 are fixedly connected by another second insulating component 14;

[0099] The first extension segment 1152, the second extension segment 1162, the third extension segment 1172, the fourth extension segment 1182, the fifth extension segment 1192 and the sixth extension segment 11102 are fixedly connected by the third insulating component 15.

[0100] By setting the second insulation component 14, the first L-shaped segment 1151, the second L-shaped segment 1161, the third L-shaped segment 1171, and the fourth L-shaped segment 1181 are fixed, as are the third L-shaped segment 1171, the fourth L-shaped segment 1181, the fifth L-shaped segment 1191, and the sixth L-shaped segment 11101. Furthermore, by setting the third insulation component 15, the six extension segments are fixed. In this way, the lead structure 1 can avoid collisions and interference between the six flexible busbars caused by the vibration of the box-type transformer. It can also improve the mechanical strength of the lead structure 1, prevent the lead structure 1 from being damaged under the action of external forces, thereby ensuring the safe and stable operation of the box-type transformer and extending the service life of the lead structure 1.

[0101] like Figure 5 As shown, in one embodiment of the utility model, the second insulating component 14 includes a connector 141, two second clamps 142, a plurality of first studs 143, and a plurality of second nuts 144. The second clamps 142 are used for the simultaneous passage of the first L-shaped segment 1151 and the second L-shaped segment 1161, or for the simultaneous passage of the third L-shaped segment 1171 and the fourth L-shaped segment 1181, or for the simultaneous passage of the fifth L-shaped segment 1191 and the sixth L-shaped segment 11101. The connector 141 is disposed on the two second clamps 141. Between 42, the first stud 143 passes through a second clamp 142, a connector 141 and another second clamp 142 in sequence. The two ends of the first stud 143 are threadedly connected to two nuts respectively. The first L-shaped segment 1151, the second L-shaped segment 1161, the third L-shaped segment 1171 and the fourth L-shaped segment 1181 are fixedly connected by the second insulating assembly 14, or the third L-shaped segment 1171, the fourth L-shaped segment 1181, the fifth L-shaped segment 1191 and the sixth L-shaped segment 11101 are fixedly connected.

[0102] like Figure 5 As shown, in one embodiment of the utility model, the third insulating component 15 includes two third clamps 151, a plurality of second studs 152 and a plurality of third nuts 153; six extension segments are disposed between the two third clamps 151, the second studs 152 pass through the two third clamps 151, and the two ends of the second studs 152 are respectively threadedly connected to the third nuts 153, and the six extension segments are fixedly connected by the third insulating component 15.

[0103] Preferably, the connector 141, the second clamp 142 and the third clamp 151 are all made of laminated wood.

[0104] To further explain, before the lead-out assembly 11 of this lead structure 1 is placed into the housing 2, the six L-shaped segments and the six extension segments need to be fixed and tied with strapping. This is because the six soft strips and the three transition strips (hard strips) will interfere with each other when the lead-out assembly 11 is placed into the housing 2, which will affect the housing operation.

[0105] This utility model also proposes a box-type transformer.

[0106] In the embodiments of this utility model, such as Figures 6 to 8 As shown, the box-type transformer includes a box body 2, a heat dissipation assembly 4, several sets of heat sinks 3, and the aforementioned lead structure 1;

[0107] Several sets of radiators 3 are arranged on the long side wall of the box 2 and are spaced apart along the length of the box 2. The heat dissipation assembly 4 is arranged on the top of several sets of radiators 3. The heat dissipation assembly 4 includes a first fixing plate 41, a first connecting rod 42 and several fans 43.

[0108] Several first fixing plates 41 are fixed to the top of the radiator 3, and a first connecting rod 42 spans across the top of several groups of radiators 3. The first connecting rod 42 is detachably connected to several first fixing plates 41. Fans 43 are detachably connected to a first connecting rod 42 at both ends along the width direction of the housing 2. Several fans 43 are spaced apart along the arrangement direction of several groups of radiators 3 to draw air and dissipate heat from several groups of radiators 3.

[0109] The lead wire structure 1 is located inside the housing 2. One end of the first sleeve 121, one end of the second sleeve 122, and one end of the third sleeve 123 all pass through the short side wall of the housing 2 and are located outside the housing 2.

[0110] In this box-type transformer, the lead structure 1 employs six bushings, with two bushings of each phase connected in parallel. This allows high current to flow from each phase transition busbar through two flexible busbars into the two bushings, achieving current shunting and uniform distribution. Consequently, the current flowing through each first bushing 121, each second bushing 122, and each third bushing 123 is less than its rated current, effectively preventing bushing overheating and damage that could affect the normal operation of the box-type transformer. Therefore, this box-type transformer can be used in low-voltage, high-current applications, ensuring the safe and stable operation of large-capacity box-type transformers. Furthermore, in this box-type transformer, the first connecting rod 42 is fixed to the top of each group of radiators 3 via the first fixing plate 41. Fans 43 are detachably connected to one of the first connecting rods 42 at each end along the width of the box body 2. By using several fans 43 to draw air from several groups of radiators 3, the temperature rise of this box-type transformer is reduced, effectively improving its heat dissipation and promptly dissipating heat. Therefore, this box-type transformer also has the advantage of a long service life.

[0111] This invention solves the problem that existing lead wire structures are not suitable for low-voltage, high-current operating conditions, and cannot guarantee the safe and stable operation of large-capacity box-type transformers.

[0112] like Figure 7 and 8 As shown, in one embodiment of the present invention, the frame of the fan 43 is provided with a plurality of first through holes 431, and the first connecting rod 42 is provided with a second through hole 421 corresponding to the plurality of first through holes 431. The first through holes 431 and the second through holes 421 are used for bolts to pass through, thereby realizing a detachable connection between the fan 43 and the first connecting rod 42.

[0113] Preferably, the number of fans 43 is two.

[0114] like Figure 7 and 9 As shown, in one embodiment of this application, the short side wall of the housing 2 is provided with a hand hole 21 and six mounting ports 23. The hand hole 21 is located at the lower part of the short side wall of the housing 2. The hand hole 21 is used to install the A-phase transition busbar 112, the first flexible busbar 115 and the second flexible busbar 116, the B-phase transition busbar 113, the third flexible busbar 117 and the fourth flexible busbar 118, and the C-phase transition busbar 114, the fifth flexible busbar 119 and the sixth flexible busbar 1110. The short side wall of the housing 2 is also provided with a cover plate 22, which is detachably connected to the housing 2. The cover plate 22 is used to cover the hand hole 21. The six mounting ports 23 are used to allow two first sleeves 121, two second sleeves 122 and two third sleeves 123 to pass through the short side wall of the housing 2.

[0115] This box-type transformer features a handhole 21 for easy installation of three phase transition busbars and six flexible busbars. When installation is required, workers can pass through the handhole 21 and install the transformer using bolts. After installation, a cover plate 22 is placed over the handhole 21 to ensure the sealing and safety of the box-type transformer. Six mounting ports 23 are provided to allow six bushings to pass through the short side wall of the enclosure 2, thereby enabling the electrical connection between the box-type transformer and the external circuit.

[0116] To further explain, the A-phase transition busbar 112, the B-phase transition busbar 113, and the C-phase transition busbar 114 are set on the long side wall of the enclosure 2; the six flexible busbars and the six sleeves are set on the short side wall of the enclosure 2.

[0117] like Figure 6 , 9 As shown in Figure 10, in one embodiment of this application, the box-type transformer further includes a second connecting rod 5, a plurality of second fixing plates 6, and a plurality of support components 7;

[0118] Several second fixing plates 6 are respectively fixed to the bottom of several groups of radiators 3. The second connecting rod 5 spans across the bottom of several groups of radiators 3 and is detachably connected to several second fixing plates 6. The support component 7 is detachably connected to the second connecting rod 5. Several support components 7 are respectively arranged at intervals along the length direction of the second connecting rod 5. The several support components 7 are used to support several groups of radiators 3.

[0119] Since the weight of several fans 43 will exert vertical downward pressure on each group of radiators 3, the risk of oil leakage increases when the radiators 3 are under pressure. In order to reduce the risk of oil leakage, this box-type transformer is equipped with a second connecting rod 5, several second fixing plates 6 and several support components 7. The support components 7 are fixed to the bottom of each group of radiators 3 through the second connecting rod 5, and provide support for several groups of radiators 3, providing upward support force for each group of radiators 3, further improving the stability of the use of this box-type transformer and extending the service life of this box-type transformer.

[0120] like Figure 10 As shown, in one embodiment of this application, the support assembly 7 includes a support plate 71, a buffer pad 72, a plurality of third studs 73 and a plurality of fourth nuts 74;

[0121] The support plate 71 is located below the second connecting rod 5. One end of the third stud 73 along its length is detachably connected to the second connecting rod 5 via a fourth nut 74. The other end of the third stud 73 along its length is detachably connected to the support plate 71 via a fourth nut 74.

[0122] The buffer pad 72 is located at the bottom of the support plate 71.

[0123] This box-type transformer, with the cooperation of support plate 71, buffer pad 72, third stud 73 and fourth nut 74, supports several groups of radiators 3. It can provide good support for each group of radiators 3, avoid oil leakage of radiators 3, and the buffer pad 72 can protect support plate 71, reduce wear of support plate 71, and thus extend the service life of support assembly 7.

[0124] The installation process of one embodiment of this utility model is as follows:

[0125] (1) Before lowering the box, first use bolts to connect the tail row of the three low-voltage coils to the connecting row 111. Then use bolts to connect the first row of the A-phase low-voltage coil 81 to the A-phase transition row 112, the first row of the B-phase low-voltage coil 82 to the B-phase transition row 113, and the first row of the C-phase low-voltage coil 83 to the C-phase transition row 114.

[0126] (2) Use the first insulating assembly 13 to connect the A-phase transition bus 112, the B-phase transition bus 113 and the C-phase transition bus 114, connect the connecting bus 111, the B-phase transition bus 113 and the C-phase transition bus 114, and connect the connecting bus 111 and the C-phase transition bus 114.

[0127] (3) Before lowering the casing, insert the two first sleeves 121, the two second sleeves 122, and the two third sleeves 123 from the outside of the casing 2 into the corresponding mounting ports 23. Then, use screws (the screws are set on the side wall of the casing 2) and nuts to fix the six sleeves to the side wall of the casing 2. Use the second insulating assembly 14 to fix the first L-shaped section 1151, the second L-shaped section 1161, the third L-shaped section 1171, and the fourth L-shaped section 1181, as well as the third L-shaped section 1171, the fourth L-shaped section 1181, the fifth L-shaped section 1191, and the sixth L-shaped section 11101; then use the third insulating assembly 15 to fix the six extension sections. Then use tie-up straps to tie and fix the six L-shaped sections and the six extension sections. Next, bolts and nuts are used to connect the two first sleeves 121 to the first extension 1152 and the second extension 1162, the two second sleeves 122 to the third extension 1172 and the fourth extension 1182, and the two third sleeves 123 to the fifth extension 1192 and the sixth extension 11102.

[0128] (4) After the casing is lowered, untie the cable ties, and then use bolts and nuts to connect the A-phase transition strip 112 to the first L-shaped section 1151 and the second L-shaped section 1161 through the handhole 21; connect the B-phase transition strip 113 to the third L-shaped section 1171 and the fourth L-shaped section 1181; and connect the C-phase transition strip 114 to the fifth L-shaped section 1191 and the sixth L-shaped section 11101. After installation, cover the handhole 21 with the cover plate 22.

[0129] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A lead structure suitable for low voltage and high current, characterized by, It includes a lead-out assembly and a low-pressure bushing assembly; the low-pressure bushing assembly is disposed on one side of the lead-out assembly; The lead-out bus assembly includes a connecting bus, an A-phase transition bus, a B-phase transition bus, a C-phase transition bus, a first soft bus and a second soft bus arranged opposite to each other, a third soft bus and a fourth soft bus arranged opposite to each other, and a fifth soft bus and a sixth soft bus arranged opposite to each other. The connecting bar is used to connect the tail rows of three low-voltage coils; the A-phase transition bar, the B-phase transition bar, and the C-phase transition bar are respectively used to connect the first row of one of the low-voltage coils; The low-pressure bushing assembly includes two first bushings, two second bushings, and two third bushings; One end of the first flexible busbar and one end of the second flexible busbar are connected to the A-phase transition busbar, and the other ends of the first flexible busbar and the second flexible busbar are respectively connected to two first sleeves; one end of the third flexible busbar and one end of the fourth flexible busbar are connected to the B-phase transition busbar, and the other ends of the third flexible busbar and the fourth flexible busbar are respectively connected to two second sleeves; one end of the fifth flexible busbar and one end of the sixth flexible busbar are connected to the C-phase transition busbar, and the other ends of the fifth flexible busbar and the sixth flexible busbar are respectively connected to two third sleeves.

2. The lead structure suitable for low voltage and large current according to claim 1, characterized by, One end of the A-phase transition row along its length, one end of the B-phase transition row along its length, and one end of the C-phase transition row along its length are respectively connected to the first row of one of the low-voltage coils; The other end of the A-phase transition busbar along its length is perpendicularly connected to the first flexible busbar and the second flexible busbar; the end of the first flexible busbar away from the A-phase transition busbar and the end of the second flexible busbar away from the A-phase transition busbar are respectively connected to the two first sleeves; The other end of the B-phase transition busbar along its length is perpendicularly connected to the third and fourth flexible busbars; the end of the third flexible busbar away from the B-phase transition busbar and the end of the fourth flexible busbar away from the B-phase transition busbar are respectively connected to the two second sleeves; The other end of the C-phase transition busbar along its length is perpendicularly connected to the fifth and sixth flexible busbars; the end of the fifth flexible busbar away from the C-phase transition busbar and the end of the sixth flexible busbar away from the C-phase transition busbar are respectively connected to the two third sleeves; Furthermore, the first soft board, the second soft board, the third soft board, the fourth soft board, the fifth soft board, and the sixth soft board all extend upward in a vertical direction.

3. The lead structure suitable for low voltage and large current according to claim 2, characterized by, Two first sleeves are sandwiched between the first flexible busbar and the second flexible busbar, and the two first sleeves are spaced apart and arranged in parallel along the vertical direction; Two second sleeves are sandwiched between the third flexible busbar and the fourth flexible busbar, and the two second sleeves are spaced apart and parallel to each other in the vertical direction; The two third sleeves are sandwiched between the fifth flexible busbar and the sixth flexible busbar, and the two third sleeves are spaced apart and arranged in parallel along the vertical direction; The first sleeve, the second sleeve, and the third sleeve are arranged in a row.

4. The lead structure suitable for low voltage and large current according to claim 3, characterized by, The first flexible busbar includes a first L-shaped section and a first extension section, and the second flexible busbar includes a second L-shaped section and a second extension section. One end of the first L-shaped section and one end of the second L-shaped section are both connected to the A-phase transition busbar. The other end of the first L-shaped section is perpendicularly connected to the first extension section, and the other end of the second L-shaped section is perpendicularly connected to the second extension section. Two first sleeves are disposed between the first extension section and the second extension section. The third flexible busbar includes a third L-shaped section and a third extension section, and the fourth flexible busbar includes a fourth L-shaped section and a fourth extension section. One end of the third L-shaped section and one end of the fourth L-shaped section are both connected to the B-phase transition busbar. The other end of the third L-shaped section is perpendicularly connected to the third extension section, and the other end of the fourth L-shaped section is perpendicularly connected to the fourth extension section. Two second sleeves are disposed between the third extension section and the fourth extension section. The fifth flexible busbar includes a fifth L-shaped section and a fifth extension section, and the sixth flexible busbar includes a sixth L-shaped section and a sixth extension section. One end of the fifth L-shaped section and one end of the sixth L-shaped section are both connected to the C-phase transition busbar. The other end of the fifth L-shaped section is perpendicularly connected to the fifth extension section, and the other end of the sixth L-shaped section is perpendicularly connected to the sixth extension section. Two third sleeves are disposed between the fifth extension section and the sixth extension section. Furthermore, the first L-shaped segment, the second L-shaped segment, the third L-shaped segment, the fourth L-shaped segment, the fifth L-shaped segment, and the sixth L-shaped segment are parallel to each other.

5. The lead structure suitable for low voltage and high current according to claim 4, characterized in that, The lead structure also includes a first insulating component; The A-phase transition busbar, the B-phase transition busbar, and the C-phase transition busbar are fixedly connected by the first insulating component; The connecting bar, the B-phase transition bar, and the C-phase transition bar are fixedly connected by the first insulating component; The connecting bar and the C-phase transition bar are fixedly connected by the first insulating component.

6. The lead structure suitable for low voltage and large current according to claim 4, wherein The lead structure also includes a second insulation component and a third insulation component; The first L-shaped segment, the second L-shaped segment, the third L-shaped segment, and the fourth L-shaped segment are fixedly connected by a second insulating component; The third L-shaped segment, the fourth L-shaped segment, the fifth L-shaped segment, and the sixth L-shaped segment are fixedly connected by another second insulating component; The first extension segment, the second extension segment, the third extension segment, the fourth extension segment, the fifth extension segment, and the sixth extension segment are fixedly connected by the third insulating component.

7. A box-type transformer characterized by It includes a housing, a heat dissipation assembly, several sets of heat sinks, and a lead wire structure as described in any one of claims 1 to 6; Several groups of radiators are disposed on the long side wall of the housing and are arranged at intervals along the length of the housing. The heat dissipation assembly is disposed on the top of the several groups of radiators. The heat dissipation assembly includes a first fixing plate, a first connecting rod and several fans. Several first fixing plates are fixed to the top of the radiator, and the first connecting rod spans across the top of several groups of radiators, and the first connecting rod is detachably connected to several first fixing plates; the fans are detachably connected to one of the first connecting rods at both ends along the width direction of the housing, and several fans are spaced apart along the arrangement direction of several groups of radiators to draw air and dissipate heat from several groups of radiators. The lead wire structure is located inside the housing, with one end of the first sleeve, one end of the second sleeve, and one end of the third sleeve all passing through the short side wall of the housing and located outside the housing.

8. The box-type transformer according to claim 7, characterized in that, The short side wall of the enclosure has a hand hole and six mounting ports. The hand hole is located at the lower part of the short side wall of the enclosure and is used to install the A-phase transition busbar, the first flexible busbar, and the second flexible busbar; the B-phase transition busbar, the third flexible busbar, and the fourth flexible busbar; and the C-phase transition busbar, the fifth flexible busbar, and the sixth flexible busbar. The short side wall of the enclosure is also provided with a cover plate, which is detachably connected to the enclosure and is used to cover the hand hole. The six mounting ports are used for two first sleeves, two second sleeves, and two third sleeves to pass through the short side wall of the enclosure.

9. The box-type transformer according to claim 7, characterized in that, The box-type transformer also includes a second connecting rod, several second fixing plates, and several support components; Several second fixing plates are respectively fixed to the bottom ends of several groups of heat sinks, and the second connecting rod spans across the bottom of several groups of heat sinks, and the second connecting rod is detachably connected to several second fixing plates; the support assembly is detachably connected to the second connecting rod, and several support assemblies are respectively spaced along the length direction of the second connecting rod, and the several support assemblies are used to support several groups of heat sinks.

10. The box-type transformer according to claim 9, characterized in that, The support assembly includes a support plate, a buffer pad, several third studs, and several fourth nuts; The support plate is disposed below the second connecting rod, and one end of the third stud along its length is detachably connected to the second connecting rod via the fourth nut; the other end of the third stud along its length is detachably connected to the support plate via the fourth nut. The buffer pad is disposed at the bottom end of the support plate.

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