Lead structure led out from two sides and transformer

Abstract

The utility model discloses a lead structure led out from two sides and a transformer, which relate to the technical field of transformers and have the technical key points that the lead structure led out from two sides is applied to the transformer, three-phase coils of the transformer are distributed in parallel, and the transformer is provided with a first side and a second side in the parallel direction of the three-phase coils. The lead wire structure comprises a first lead wire assembly, a second lead wire assembly and a third lead wire assembly, and by arranging the first lead wire assembly, the second lead wire assembly and the third lead wire assembly, on the premise that it is ensured that an a1-phase sleeve, a b1-phase sleeve, a c1-phase sleeve, an a2-phase sleeve, a b2-phase sleeve and a c2-phase sleeve can be connected into a circuit, due to the fact that the impedance difference between a first side and a second side is small, the lead wire assembly can be connected into the circuit; the problem that in the prior art, due to the fact that the impedance difference between half-ride-through operation and full-ride-through operation is large, time for selecting a fuse protection system is inconvenient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and particularly relates to a lead structure led out from both sides and a transformer. Background Technique

[0002] With the intensification of competition in the North American optical storage market, the demand for split transformers has increased significantly. In the prior art, split transformers usually have three phases, namely A, B, and C phases. Split transformers may have fault forms such as single-phase grounding short circuit, two-phase short circuit, and three-phase short circuit, and the fault forms are complex. Therefore, the fuse protection system is also an essential part of split transformers. However, split transformers usually operate in two modes: semi-through operation and full-through operation. Among them, when one branch of the low-voltage split winding operates against the high-voltage winding, it is called semi-through operation. At this time, the short-circuit impedance of the transformer is called the semi-through impedance. When the two low-voltage windings are connected in parallel and both the high-voltage and low-voltage windings are put into operation, it is called full-through operation. At this time, the short-circuit impedance of the transformer is called the full-through impedance. The impedance difference between semi-through operation and full-through operation is large, which will lead to a large difference in short-circuit current in the two cases, making it difficult to select a suitable fuse protection system. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a lead structure led out from both sides and a transformer. By setting the first lead assembly, the second lead assembly, and the third lead assembly, on the premise that the a1-phase bushing, b1-phase bushing, c1-phase bushing, a2-phase bushing, b2-phase bushing, and c2-phase bushing can all be connected to the circuit, due to the small impedance difference between the first side and the second side, the problem in the prior art that it is inconvenient to select a fuse protection system due to the large impedance difference between semi-through operation and full-through operation is solved.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] A lead structure led out from both sides is applied to a transformer. The three-phase coils of the transformer are arranged in parallel. The transformer has a first side and a second side in the direction of the parallel arrangement of the three-phase coils. The transformer is provided with an a1-phase bushing, a b1-phase bushing, and a c1-phase bushing on the first side, and the transformer is provided with an a2-phase bushing, a b2-phase bushing, and a c2-phase bushing on the second side. The lead structure includes:

[0006] A first lead assembly, the first lead assembly includes a first-side short lead segment and a second-side long lead segment. The starting ends of the first-side short lead segment and the second-side long lead segment are commonly connected to the outgoing line end of the coil near the first side. The terminal of the first-side short lead segment is connected to the a1-phase bushing on the first side, and the terminal of the second-side long lead segment is connected to the a2-phase bushing on the second side;

[0007] The second lead assembly, the second lead assembly includes a first-side middle lead segment and a second-side middle lead segment, the starting ends of the first-side middle lead segment and the second-side middle lead segment are commonly connected to the outgoing line end of the coil near the middle, the terminal of the first-side middle lead segment is connected to the b-phase bushing on the first side, and the terminal of the second-side middle lead segment is connected to the b2-phase bushing on the second side;

[0008] The third lead assembly, the third lead assembly includes a first-side long lead segment and a second-side short lead segment, the starting ends of the first-side long lead segment and the second-side short lead segment are commonly connected to the outgoing line end of the coil near the second side, the terminal of the first-side long lead segment is connected to the c1-phase bushing on the first side, and the terminal of the second-side short lead segment is connected to the c2-phase bushing on the second side;

[0009] Wherein, the length of the first-side middle lead segment is greater than the length of the first-side short lead segment and less than the length of the first-side long lead segment, and the length of the second-side middle lead is greater than the length of the second-side short lead segment and less than the length of the second-side long lead segment;

[0010] And, the absolute value of the difference between the sum of the first-side short lead segment, the first-side middle lead segment and the first-side long lead segment and the sum of the second-side short lead segment, the second-side middle lead segment and the second-side long lead segment does not exceed 20 centimeters.

[0011] Optionally, the first-side short lead segment includes at least one a1 flexible connection row, the starting end of the a1 flexible connection row is connected to the outgoing line end of the coil near the first side, and the terminal of the a1 flexible connection row is connected to the a1-phase bushing.

[0012] Optionally, the second-side long lead segment includes a first transition row and an a2 flexible connection row, the starting end of the first transition row is connected to the outgoing line end of the coil near the first side, and the terminal of the first transition row is connected to the a2-phase bushing through the a2 flexible connection row.

[0013] Optionally, the first-side middle lead segment includes a second transition row, a third transition row, a first arched row and a b1 flexible connection row, the starting end of the second transition row is connected to the outgoing line end of the coil near the middle, the terminal of the second transition row and the starting end of the third transition row are connected through the first arched row, the starting end of the third transition row is connected to the b1-phase bushing through the b1 flexible connection row, and the first transition row passes under the first arched row.

[0014] Optionally, the lead segment on the second side includes a fourth transition row and a b2 flexible connection row. The starting end of the fourth transition row is connected to the outgoing line end of the coil near the middle, and the terminal of the fourth transition row is connected to the b2 phase bushing through the b2 flexible connection row.

[0015] Optionally, the long lead segment on the first side includes a fifth transition row, a sixth transition row, a second arched row, and a c1 flexible connection row. The starting end of the fifth transition row is connected to the outgoing line end of the coil near the second side. The terminal of the fifth transition row and the starting end of the sixth transition row are connected through the second arched row. The terminal of the sixth transition row is connected to the c1 phase bushing through the c1 flexible connection row. The first transition row and the second arched row pass through from below the second arched row.

[0016] Optionally, the short lead segment on the second side includes at least one c2 flexible connection row. The starting end of the c2 flexible connection row is connected to the outgoing line end of the coil near the second side, and the terminal of the c2 flexible connection row is connected to the c2 phase bushing.

[0017] Optionally, there is laminated wood at the adjacent position of the first transition row and the second arched row, at the adjacent position of the fourth transition row and the fifth transition row, at the adjacent position of the third transition row and the sixth transition row, and at the adjacent position of the first transition row and the third transition row.

[0018] Optionally, fixing plates are provided on the a1 phase bushing, b1 phase bushing, c1 phase bushing, a2 phase bushing, b2 phase bushing, and c2 phase bushing, and through holes are provided on the fixing plates.

[0019] The present utility model also provides a transformer, including the lead structure led out from both sides described above.

[0020] Compared with the prior art, the embodiments of the present utility model have the following beneficial effects:

[0021] In practical applications, the lead structures led out from both sides of the present application are used in combination with the transformers in the prior art. Specifically, a lead structure led out from both sides provided by the present utility model is provided with a first lead assembly, a second lead assembly, and a third lead assembly. The first lead assembly includes a first-side short lead segment and a second-side long lead segment. Among them, since the absolute value of the difference between the sum of the first-side short lead segment, the first-side middle lead segment, and the first-side long lead segment and the sum of the second-side short lead segment, the second-side middle lead segment, and the second-side long lead segment does not exceed 20 cm, on the premise that the a1-phase bushing, b1-phase bushing, c1-phase bushing, a2-phase bushing, b2-phase bushing, and c2-phase bushing can all be connected to the circuit, due to the small difference in the paths through which the currents flowing into the first side and the second side pass, the sum of the resistances of the first-side short lead segment, the first-side middle lead segment, and the first-side long lead segment and the sum of the resistances of the second-side short lead segment, the second-side middle lead segment, and the second-side long lead segment have a small resistance difference, realizing that when the transformer operates in semi-through mode and full-through mode, the impedance difference is small, and when it operates in semi-through mode and full-through mode, the current difference is small, which is convenient for selecting the time of the fuse protection system, and solves the problem in the prior art that it is inconvenient to select the time of the fuse protection system due to the large impedance difference between the semi-through operation and the full-through operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an embodiment of the lead structure led out from both sides of the present utility model;

[0023] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0024] Figure 3 is a bottom view of an embodiment of the lead structure led out from both sides of the present utility model;

[0025] Figure 4 is a schematic structural diagram of an embodiment of the transformer of the present utility model;

[0026] Figure 5 is a rear view of an embodiment of the transformer of the present utility model;

[0027] Figure 6 is a wiring schematic diagram of an embodiment of the transformer of the present utility model;

[0028] Figure 7 is a wiring schematic diagram of Test 1 of an embodiment of the lead structure led out from both sides of the present utility model;

[0029] Figure 8 is a wiring schematic diagram of Test 2 of an embodiment of the lead structure led out from both sides of the present utility model;

[0030] Figure 9This is the wiring schematic diagram of Test 3 of an embodiment of the lead structure led out from both sides of the present utility model.

[0031] Explanation of the reference numerals in the attached drawings: 1. Transformer; 2. a1-phase bushing; 3. b1-phase bushing; 4. c1-phase bushing; 5. a2-phase bushing; 6. b2-phase bushing; 7. c2-phase bushing; 8. First lead assembly; 801. First short lead segment on one side; 8011. a1 flexible connection row; 802. Second long lead segment on one side; 8021. First transition row; 8022. a2 flexible connection row; 9. Second lead assembly; 901. First middle lead segment on one side; 9011. Second transition row; 9012. Third transition row; 9013. First arched row; 9014. b1 flexible connection row; 902. Second middle lead segment on one side; 9021. Fourth transition row; 9022. b2 flexible connection row; 10. Third lead assembly; 1001. First long lead segment on one side; 10011. Fifth transition row; 10012. Sixth transition row; 10013. Second arched row; 10014. c1 flexible connection row; 1002. Second short lead segment on one side; 10021. c2 flexible connection row; 11. Laminated wood; 12. Fixed plate. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The present utility model provides a lead structure with leads drawn out from both sides.

[0037] Please refer to Figures 1 - 5, the lead structure led out from both sides is applied to the transformer 1. The three-phase coils of the transformer 1 are arranged side by side. The transformer 1 has a first side and a second side in the direction of the side-by-side arrangement of the three-phase coils. The transformer 1 is provided with an a1-phase bushing 2, a b1-phase bushing 3, and a c1-phase bushing 4 on the first side, and the transformer 1 is provided with an a2-phase bushing 5, a b2-phase bushing 6, and a c2-phase bushing 7 on the second side. The lead structure includes: a first lead assembly 8, the first lead assembly 8 includes a first-side short lead segment 801 and a second-side long lead segment 802. The starting end of the first-side short lead segment 801 and the starting end of the second-side long lead segment 802 are commonly connected to the outgoing line end of the coil near the first side. The terminal of the first-side short lead segment 801 is connected to the a1-phase bushing 2 on the first side, and the terminal of the second-side long lead segment 802 is connected to the a2-phase bushing 5 on the second side; a second lead assembly 9, the second lead assembly 9 includes a first-side middle lead segment 901 and a second-side middle lead segment 902. The starting end of the first-side middle lead segment 901 and the starting end of the second-side middle lead segment 902 are commonly connected to the outgoing line end of the coil near the middle. The terminal of the first-side middle lead segment 901 is connected to the b1-phase bushing 3 on the first side, and the terminal of the second-side middle lead segment 902 is connected to the b2-phase bushing 6 on the second side; a third lead assembly 10, the third lead assembly 10 includes a first-side long lead segment 1001 and a second-side short lead segment 1002. The starting end of the first-side long lead segment 1001 and the starting end of the second-side short lead segment 1002 are commonly connected to the outgoing line end of the coil near the second side. The terminal of the first-side long lead segment 1001 is connected to the c1-phase bushing 4 on the first side, and the terminal of the second-side short lead segment 1002 is connected to the c2-phase bushing 7 on the second side; wherein, the length of the first-side middle lead segment 901 is greater than the length of the first-side short lead segment 801 and less than the length of the first-side long lead segment 1001, and the length of the second-side middle lead is greater than the length of the second-side short lead segment 1002 and less than the length of the second-side long lead segment 802; and, the absolute value of the difference between the sum of the first-side short lead segment 801, the first-side middle lead segment 901, and the first-side long lead segment 1001 and the sum of the second-side short lead segment 1002, the second-side middle lead segment 902, and the second-side long lead segment 802 does not exceed 20 centimeters.

[0038] A lead structure with leads drawn out from both sides provided by the present utility model is provided with a first lead assembly 8, a second lead assembly 9, and a third lead assembly 10. The first lead assembly 8 includes a first-side short lead segment 801 and a second-side long lead segment 802. The second lead assembly 9 includes a first-side middle lead segment 901 and a second-side middle lead segment 902. The third lead assembly 10 includes a first-side long lead segment 1001 and a second-side short lead segment 1002. Among them, since the absolute value of the difference between the sum of the first-side short lead segment 801, the first-side middle lead segment 901, and the first-side long lead segment 1001 and the sum of the second-side short lead segment 1002, the second-side middle lead segment 902, and the second-side long lead segment 802 does not exceed 20 cm, on the premise that the a1-phase bushing 2, b1-phase bushing 3, c1-phase bushing 4, a2-phase bushing 5, b2-phase bushing 6, and c2-phase bushing 7 can all be connected to the circuit, because the difference in the paths through which the currents flowing into the first side and the second side pass is small, that is, the sum of the resistances of the first-side short lead segment 801, the first-side middle lead segment 901, and the first-side long lead segment 1001 and the sum of the resistances of the second-side short lead segment 1002, the second-side middle lead segment 902, and the second-side long lead segment 802 have a small resistance difference, it is realized that whether the transformer operates unilaterally or bilaterally, the impedance difference is small. When operating in the above three cases, the short-circuit current difference is small, and it is more convenient to select the fuse protection system time, solving the problem in the prior art that due to the large impedance difference between the semi-through operation and the full-through operation, it is more inconvenient to select the fuse protection system time.

[0039] Please refer to Figure 1 and Figure 3 , in an embodiment of the present utility model, the first-side short lead segment 801 includes at least one a1 flexible connection row 8011. The starting end of the a1 flexible connection row 8011 is connected to the outgoing line end of the coil near the first side, and the terminal end of the a1 flexible connection row 8011 is connected to the a1-phase bushing 2.

[0040] In the technical solution of this embodiment, since the flexible connection row is usually made of copper wire braid and can be deformed to a certain extent, connecting the a1-phase bushing 2 through the a1 flexible connection row 8011 facilitates adjusting the position of the a1-phase bushing 2 for wiring on the a1-phase bushing 2.

[0041] Please refer to Figure 1 and Figure 3 , in an embodiment of the present utility model, the second-side long lead segment 802 includes a first transition row 8021 and an a2 flexible connection row 8022. The starting end of the first transition row 8021 is connected to the outgoing line end of the coil near the first side, and the terminal end of the first transition row 8021 is connected to the a2-phase bushing 5 through the a2 flexible connection row 8022.

[0042] In the technical solution of this embodiment, by segmenting the second side long lead wire into a first transition row 8021 and an a2 flexible connection row 8022, the installation of the second side long lead wire is relatively convenient. The a2 flexible connection row 8022 is used to connect the first transition row 8021 and the a2 phase bushing 5. Since the flexible connection row is usually made of copper wire braiding, it can be deformed to a certain extent, which is convenient for adjusting the position of the a2 phase bushing 5 to facilitate wiring on the a2 phase bushing 5. Of course, a whole copper row can also be used to replace the second side long lead wire. In this way, there is no need to consider the problem of conductive stability after the connection between the segmented row bodies. However, the installation of a whole copper row is relatively inconvenient, and the choice can be made according to specific requirements.

[0043] Please refer to Figure 1 and Figure 3 In an embodiment of the present utility model, the first side middle lead segment 901 includes a second transition row 9011, a third transition row 9012, a first arched row 9013, and a b1 flexible connection row 9014. The starting end of the second transition row 9011 is connected to the outgoing line end of the coil near the middle. The terminal of the second transition row 9011 and the starting end of the third transition row 9012 are connected through the first arched row 9013. The starting end of the third transition row 9012 is connected to the b1 phase bushing 3 through the b1 flexible connection row 9014. The first transition row 8021 passes through the lower part of the first arched row 9013.

[0044] In the technical solution of this embodiment, by segmenting the first side middle lead segment 901 into a second transition row 9011, a third transition row 9012, a first arched row 9013, and a b1 flexible connection row 9014, the installation of the segmented first side middle lead segment 901 is relatively convenient. The first transition row 8021 passes through the first arched row 9013, which can prevent the second side long lead wire from contacting the first side middle lead segment 901 and causing a short circuit. At the same time, the b1 flexible connection row 9014 is set. The third transition row 9012 is connected to the b1 phase bushing 3 through the b1 flexible connection row 9014. Since the flexible connection row is usually made of copper wire braiding, it can be deformed to a certain extent, which is convenient for adjusting the position of the b1 phase bushing 3 to facilitate wiring on the b1 phase bushing 3. Of course, a whole copper row can also be used to replace the first side middle lead segment 901. In this way, there is no need to consider the problem of conductive stability after the connection between the segmented row bodies. However, the installation of a whole copper row is relatively inconvenient, and the choice can be made according to specific requirements.

[0045] Please refer to Figure 1 and Figure 3, in an embodiment of the present utility model, the lead wire segment 902 in the second side includes a fourth transition row 9021 and a b2 flexible connection row 9022. The starting end of the fourth transition row 9021 is connected to the outgoing line end of the coil near the middle, and the terminal end of the fourth transition row is connected to the b2 phase bushing 6 through the b2 flexible connection row 9022.

[0046] In the technical solution of this embodiment, by segmenting the lead wire segment 902 in the second side into a fourth transition row 9021 and a b2 flexible connection row 9022, the segmented lead wire segment 902 in the second side is relatively convenient to install. At the same time, the fourth transition row 9021 and the b2 phase bushing 6 are connected through the b2 flexible connection row 9022. Since the flexible connection row is usually made of copper wire braiding, it can be deformed to a certain extent, which is convenient for adjusting the position of the b2 phase bushing 6 to facilitate wiring on the b2 phase bushing 6. Of course, a whole copper row can also be used to replace the segmentation of the lead wire segment 902 in the second side. In this way, there is no need to consider the problem of conductive stability after the connection of the segmented row bodies. However, the installation of a whole copper row is relatively inconvenient, and it can be selected according to specific requirements.

[0047] Please refer to Figure 1 and Figure 3 , in an embodiment of the present utility model, the first side long lead wire segment 1001 includes a fifth transition row 10011, a sixth transition row 10012, a second arched row 10013, and a c1 flexible connection row 10014. The starting end of the fifth transition row 10011 is connected to the outgoing line end of the coil near the second side. The terminal end of the fifth transition row 10011 and the starting end of the sixth transition row 10012 are connected through the second arched row 10013. The terminal end of the sixth transition row 10012 is connected to the c1 phase bushing 4 through the c1 flexible connection row 10014. The first transition row 8021 and the second arched row 10013 pass through the lower part of the second arched row.

[0048] In the technical solution of this embodiment, by segmenting the first side long lead segment 1001 into a fifth transition row 10011, a sixth transition row 10012, a second arched row 10013, and a c1 flexible connection row 10014, the installation of the segmented first side long lead segment 1001 is also relatively convenient. The second arched row 10013 and the third transition row 9012 are connected by the first arched row 9013, and the c1 flexible connection row 10014 is set. The sixth transition row 10012 is connected to the c1 phase bushing 4 through the c1 flexible connection row 10014. Since the flexible connection row is usually made of copper wire braiding, it can be deformed to a certain extent, facilitating the adjustment of the position of the c1 phase bushing 4 for wiring on the c1 phase bushing 4. The second arched row 10013 passes through the first arched row 9013, which can prevent the second side long lead from contacting the first side middle lead segment 901 and causing a short circuit. Of course, a whole copper row can also be used to replace the first side middle lead segment 901. In this way, there is no need to consider the problem of conductive stability after the connection of the segmented rows, but the installation of a whole copper row is relatively inconvenient, and it can be selected according to specific requirements.

[0049] Please refer to Figure 1 and Figure 3 In an embodiment of the present invention, the second side short lead segment 1002 has at least one c2 flexible connection row 10021. The starting end of the c2 flexible connection row 10021 is connected to the outgoing line end of the coil near the second side, and the terminal end of the c2 flexible connection row 10021 is connected to the c2 phase bushing 7.

[0050] In the technical solution of this embodiment, since the flexible connection row is usually made of copper wire braiding, connecting the c2 phase bushing 7 through the c2 flexible connection row 10021 facilitates the position of the c2 phase bushing 7 for wiring on the c2 phase bushing 7.

[0051] Please refer to Figure 1 and Figure 3 In an embodiment of the present invention, there is a laminated wood 11 at the adjacent position of the first transition row 8021 and the second arched row 10013, a laminated wood 11 at the adjacent position of the fourth transition row 9021 and the fifth transition row 10011, a laminated wood 11 at the adjacent position of the third transition row 9012 and the sixth transition row 10012, and a laminated wood 11 at the adjacent position of the first transition row 8021 and the third transition row 9012.

[0052] In the technical solution of this embodiment, to make the present utility model more stable, a laminated wood 11 at the end of the laminated wood 11 is arranged between the first transition row 8021 and the second arched row 10013 and contacts the first conductive row 5, and is fixed by an insulating bolt, so that the first transition row 8021 and the second arched row 10013 form an integral body. In addition, the laminated wood 11 is also arranged at the adjacent position of the first transition row 8021 and the fourth transition row 9021, the adjacent position of the third transition row 9012 and the fifth transition row 10011, and the adjacent position of the fourth transition row 9021 and the sixth transition row 10012, so that the first lead assembly 8, the second lead assembly 9 and the third lead assembly 10 form an integral body, effectively preventing the first lead assembly 8, the second lead assembly 9 and the third lead assembly 10 from being bent.

[0053] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, fixing plates 12 are provided on the a1-phase bushing 2, b1-phase bushing 3, c1-phase bushing 4, a2-phase bushing 5, b2-phase bushing 6 and c2-phase bushing 7, and through holes are provided in the fixing plates 12.

[0054] In the technical solution of this embodiment, since the a1-phase bushing 2, b1-phase bushing 3, c1-phase bushing 4, a2-phase bushing 5, b2-phase bushing 6 and c2-phase bushing 7 will move, a fixing plate 12 is provided on the a1-phase bushing 2, b1-phase bushing 3, c1-phase bushing 4, a2-phase bushing 5, b2-phase bushing 6 and c2-phase bushing 7. Holes for installing screws can be provided on the fixing plate 12. During installation, the a1-phase bushing 2, b1-phase bushing 3, c1-phase bushing 4, a2-phase bushing 5, b2-phase bushing 6 and c2-phase bushing 7 are fixed on the transformer tank by screws to prevent them from moving.

[0055] Please refer to Figure 4 and Figure 5 , the present utility model also provides a transformer, including the lead structure led out on both sides as described above. The specific structure of this transformer refers to the above embodiment. Since this transformer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0056] The wiring method of the lead structure led out from both sides provided by the present utility model is as follows: it is installed on the transformer 1, which has an A-phase coil near the first side, a B-phase coil in the middle, and a C-phase coil near the second side. The A-phase coil, B-phase coil, and C-phase coil all have a high-voltage coil and a low-voltage coil. The ends of the low-voltage coils of the A-phase coil, B-phase coil, and C-phase coil 103 are connected in a Y shape through a zero-phase busbar, and the heads of the low-voltage coils of the A-phase coil, B-phase coil, and C-phase coil 103 are all provided with outgoing terminals, which are used to connect the first lead assembly 8, the second lead assembly 9, and the third lead assembly 10. The ends of the high-voltage coils of the A-phase coil, B-phase coil, and C-phase coil are connected in a D shape, and high-voltage output cables are respectively led out from the high-voltage coils of the A-phase coil 101. As Figure 6 shown, after the high-voltage coils of the A-phase coil, B-phase coil, and C-phase coil are connected in a D shape, the high-voltage output cables led out from the high-voltage coils are connected to the overload fuse and the backup fuse, and then are respectively led to the high-voltage side A1, B1, C1 bushings, and are respectively led out to A2, B2, C2 through leads to complete the ring network wiring.

[0057] To illustrate that the line impedance differences on both sides of the first lead assembly 8, the second lead assembly 9, and the third lead assembly 10 are relatively small, an embodiment of the present utility model provides three tests. In the three tests, the absolute value of the difference between the sum of the first-side short lead segment 801, the first-side middle lead segment 901, and the first-side long lead segment 1001 and the sum of the second-side short lead segment 1002, the second-side middle lead segment 902, and the second-side long lead segment 802 is 20 cm. The calculation formula for the impedance is: (√3 * current * voltage) / rated capacity * 100%.

[0058] The specific tests are as follows:

[0059] The first group of test data: Short-circuit the a1-phase bushing 2, b1-phase bushing 3, and c1-phase bushing 4, and short-circuit the a2-phase bushing 5, b2-phase bushing 6, and c2-phase bushing 7. Apply a specified value of current to the A1, B1, C1 sides through a test power supply. The wiring schematic diagram is as Figure 7 shown, where the voltage of gear 1 is set to +5% of the rated voltage, the voltage of gear 3 is the rated voltage, and the voltage of gear 5 is set to -5% of the rated voltage.

[0060] The test results are as follows:

[0061]

[0062] The second group of test data: Short-circuit the a1-phase bushing 2, b1-phase bushing 3, and c1-phase bushing 4, and apply a specified value of current to the A1, B1, C1 sides through a test power supply. The wiring principle Figure 8 is shown.

[0063] The test results are as follows:

[0064]

[0065] The third group of test data: The a2-phase bushing 5, b2-phase bushing 6, and c2-phase bushing 7 are short-circuited, and a current of a specified value is applied through the test power supply on the A1, B1, and C1 sides. The wiring schematic diagram is as Figure 9 shown.

[0066] The test results are as follows:

[0067]

[0068]

[0069] Conclusion: From the above three groups of data, whether the low-voltage side is short-circuited on the left or the right, the differences in impedance voltage and load loss among the three are very small, and it will not impose an excessive balance adjustment output burden on the inverters on both sides.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A lead structure with leads drawn from both sides, applied to a transformer. The three-phase coils of the transformer are arranged in parallel. The transformer has a first side and a second side in the direction of the parallel arrangement of the three-phase coils. The transformer is provided with an a1-phase bushing, a b1-phase bushing, and a c1-phase bushing on the first side, and the transformer is provided with an a2-phase bushing, a b2-phase bushing, and a c2-phase bushing on the second side. It is characterized in that, The lead structure includes: A first lead assembly, the first lead assembly including a first-side short lead segment and a second-side long lead segment. The starting end of the first-side short lead segment and the starting end of the second-side long lead segment are jointly connected to the outgoing line end of the coil near the first side. The terminal end of the first-side short lead segment is connected to the a1-phase bushing on the first side, and the terminal end of the second-side long lead segment is connected to the a2-phase bushing on the second side. A second lead assembly, the second lead assembly including a first-side middle lead segment and a second-side middle lead segment. The starting end of the first-side middle lead segment and the starting end of the second-side middle lead segment are jointly connected to the outgoing line end of the coil near the middle. The terminal end of the first-side middle lead segment is connected to the b-phase bushing on the first side, and the terminal end of the second-side middle lead segment is connected to the b2-phase bushing on the second side. A third lead assembly, the third lead assembly including a first-side long lead segment and a second-side short lead segment. The starting end of the first-side long lead segment and the starting end of the second-side short lead segment are jointly connected to the outgoing line end of the coil near the second side. The terminal end of the first-side long lead segment is connected to the c1-phase bushing on the first side, and the terminal end of the second-side short lead segment is connected to the c2-phase bushing on the second side. Wherein, the length of the first-side middle lead segment is greater than the length of the first-side short lead segment and less than the length of the first-side long lead segment, and the length of the second-side middle lead is greater than the length of the second-side short lead segment and less than the length of the second-side long lead segment. And, the absolute value of the difference between the sum of the first-side short lead segment, the first-side middle lead segment and the first-side long lead segment and the sum of the second-side short lead segment, the second-side middle lead segment and the second-side long lead segment does not exceed 20 centimeters.

2. The lead structure led out from both sides according to claim 1, characterized in that, The first-side short lead segment includes at least one a1 flexible connection row. The starting end of the a1 flexible connection row is connected to the outgoing line end of the coil near the first side, and the terminal end of the a1 flexible connection row is connected to the a1-phase bushing.

3. The lead structure led out from both sides according to claim 1, characterized in that The second-side long lead segment includes a first transition row and an a2 flexible connection row. The starting end of the first transition row is connected to the outgoing line end of the coil near the first side, and the terminal end of the first transition row is connected to the a2-phase bushing through the a2 flexible connection row.

4. The lead structure led out from both sides according to claim 3, characterized in that, The first-side middle lead segment includes a second transition row, a third transition row, a first arched row and a b1 flexible connection row. The starting end of the second transition row is connected to the outgoing line end of the coil near the middle. The terminal end of the second transition row and the starting end of the third transition row are connected through the first arched row. The starting end of the third transition row is connected to the b1-phase bushing through the b1 flexible connection row, and the first transition row passes under the first arched row.

5. The lead structure led out from both sides according to claim 4, wherein The second-side middle lead segment includes a fourth transition row and a b2 flexible connection row. The starting end of the fourth transition row is connected to the outgoing line end of the coil near the middle, and the terminal end of the fourth transition row is connected to the b2-phase bushing through the b2 flexible connection row.

6. The lead structure led out from both sides according to claim 5, wherein, The first side long lead segment includes a fifth transition row, a sixth transition row, a second arched row, and a c1 soft connection row. The starting end of the fifth transition row is connected to the outgoing line end of the coil near the second side. The terminal end of the fifth transition row and the starting end of the sixth transition row are connected through the second arched row. The terminal end of the sixth transition row is connected to the c1 phase bushing through the c1 soft connection row. The first transition row and the second arched row pass through from below the second arched row.

7. The lead structure led out from both sides according to claim 1, characterized in that The second side short lead segment includes at least one c2 soft connection row. The starting end of the c2 soft connection row is connected to the outgoing line end of the coil near the second side. The terminal end of the c2 soft connection row is connected to the c2 phase bushing.

8. The lead structure led out from both sides according to claim 6, wherein Laminated wood is provided at the adjacent positions of the first transition row and the second arched row, at the adjacent positions of the fourth transition row and the fifth transition row, at the adjacent positions of the third transition row and the sixth transition row, and at the adjacent positions of the first transition row and the third transition row.

9. The lead structure led out from both sides according to claim 1, characterized in that, Fixing plates are provided on each of the a1 phase bushing, b1 phase bushing, c1 phase bushing, a2 phase bushing, b2 phase bushing, and c2 phase bushing. Through holes are formed in the fixing plates.

10. A transformer, characterized in that, It includes a lead structure with leads drawn out from both sides as described in any one of claims 1-9.

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