Low-voltage lead structure and transformer
By introducing rotatable longitudinal rows and soft connection rows into the transformer's low-voltage lead structure, the design cycle extension of the transformer's phase spacing in different environments is solved, and the versatility and cost saving of the lead structure are achieved.
Patent Information
- Application Number
- CN202422011653.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-08-19
AI Technical Summary
When existing transformers adjust the phase spacing of low-voltage sleeves in different environments, the lead structure needs to be redesigned, resulting in extended design cycles and increased costs.
The low-voltage lead structure is adopted, including busbars, transverse rows, longitudinal rows and soft connection rows. By setting arc holes on the longitudinal rows, they can rotate within a certain range, and the phase spacing is adjusted without redesigning the lead structure.
It realizes that the transformer lead structure is not required to repeatedly design in different environments, shortens the design cycle and saves project costs.
Smart Images
Figure CN223260437U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer manufacturing, in particular to a low-voltage lead structure and a transformer. Background Art
[0002] Transformers are essential electrical equipment, widely used across all aspects of power systems. The insulation distance requirements for transformers vary depending on the application scenario. While ensuring electrical safety, transformers may need to adjust the phase spacing between low-voltage bushings to meet specific safety standards and adapt to different operating environments. However, adjusting the phase spacing often requires designers to redesign the lead structure to accommodate the transformer's operating environment, making it difficult to shorten the design cycle and hindering project cost savings.
[0003] In view of this, it is necessary to propose a low-voltage lead structure and a transformer to solve or at least alleviate the above technical problems. Utility Model Content
[0004] The main purpose of the utility model is to provide a low-voltage lead structure and a transformer, aiming to solve the technical problem of difficulty in shortening the design cycle when designing transformers with different phase spacings.
[0005] To achieve the above objectives, the present invention provides a low-voltage lead structure, comprising:
[0006] A low-voltage lead, comprising a busbar, a transverse row, three winding rows, three longitudinal rows, and a flexible connection row corresponding to each of the three longitudinal rows, wherein the winding rows comprise an inner winding row and an outer winding row, and the outer winding row is connected to the busbar;
[0007] At least two arc-shaped holes are spaced apart at both ends of the longitudinal row, and the centers of at least two of the arc-shaped holes at each end coincide with each other;
[0008] The longitudinal row is rotatably connected to the soft connection row through at least two of the arc-shaped holes at one end thereof, two of the three longitudinal rows are rotatably connected to the transverse row through at least two of the arc-shaped holes at the other end thereof, and the transverse row is connected to the inner winding row, and the remaining longitudinal row is rotatably connected to the inner winding row through at least two of the arc-shaped holes at the other end thereof.
[0009] In one embodiment, the low-voltage lead also includes a 0-phase longitudinal row, and a 0-phase soft connection row arranged corresponding to the 0-phase longitudinal row, and at both ends of the 0-phase longitudinal row are provided with at least two arc-shaped holes with the same center, and the 0-phase longitudinal row is rotatably connected to the 0-phase soft connection row through at least two arc-shaped holes at one end thereof, and the 0-phase longitudinal row is rotatably connected to the bus through at least two arc-shaped holes at the other end thereof.
[0010] In one embodiment, one end of each of the three longitudinal rows is connected to the corresponding flexible connection row via a bolt, the other ends of two of the longitudinal rows are connected to the transverse row via a bolt, and the other end of another longitudinal row is connected to the inner winding row via a bolt;
[0011] One end of the 0-phase longitudinal row is bolted to the 0-phase flexible connection row, and the other end is bolted to the busbar;
[0012] The bolts pass through the arc-shaped holes accordingly, and the bolts can slide in the arc-shaped holes.
[0013] In one embodiment, the low-voltage lead structure also includes an outlet box and a bushing mounting piece, the bushing mounting piece is provided with a through hole for installing a low-voltage bushing, the low-voltage bushing is connected to the flexible connection row in a one-to-one correspondence, and the bushing mounting piece is detachably mounted on a side of the outlet box away from the flexible connection row.
[0014] In one embodiment, the outlet box includes a square tube and a connection panel, the connection panel is provided with a square hole capable of accommodating the square tube, the square tube is fixedly connected to the connection panel through the square hole, and the sleeve mounting piece is detachably mounted on the connection panel.
[0015] In one embodiment, a sealing gasket is provided between the bushing mounting member and the connection panel, and the sealing gasket is provided with an accommodating hole capable of accommodating the low-voltage bushing to pass through.
[0016] In one embodiment, a plurality of gasket stoppers are provided on one side of the connection panel connected to the sleeve mounting member, the gasket is arranged between the plurality of gasket stoppers, and the gasket stoppers are used to fix the gasket.
[0017] In one embodiment, the low-voltage lead structure further includes three low-voltage coils with different phases, and the three low-voltage coils with different phases are connected to the three winding rows in a one-to-one correspondence.
[0018] In one embodiment, a starting section of the low-voltage coil is connected to the inner winding row, and an ending section of the low-voltage coil is connected to the outer winding row.
[0019] The present utility model also provides a transformer, which includes the low-voltage lead structure described in any one of the above items.
[0020] In the technical solution provided by the present invention, the low-voltage lead structure includes a low-voltage lead, wherein the low-voltage lead includes the bus, the transverse row, three winding rows, three longitudinal rows and the soft connection row arranged in one-to-one correspondence with the three longitudinal rows, the winding row includes the inner winding row and the outer winding row, and the outer winding row is connected to the bus; at least two arc-shaped holes are spaced apart at both ends of the longitudinal row, and the centers of at least two arc-shaped holes at each end coincide; the longitudinal row is rotatably connected to the soft connection row through at least two arc-shaped holes at one end thereof, two of the three longitudinal rows are rotatably connected to the transverse row through at least two arc-shaped holes at the other end thereof, and the transverse row is connected to the inner winding row, and the remaining longitudinal row is rotatably connected to the inner winding row through at least two arc-shaped holes at the other end thereof. Through this arrangement, when the phase spacing of the transformer needs to be adjusted in different environments, it is only necessary to rotate the longitudinal rows and the flexible connection rows within the range of the arc-shaped hole to change the spacing of the flexible connection rows, and connect the flexible connection rows to the low-voltage bushing to achieve the adjustment of the phase spacing. There is no need to repeatedly design the lead structure of the transformer, which can effectively shorten the design cycle and help save project costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0022] Figure 1 A structural diagram of an embodiment of a low-voltage lead structure provided by the utility model;
[0023] Figure 2 A schematic structural diagram of a low-voltage lead in an embodiment of a low-voltage lead structure provided by the present invention;
[0024] Figure 3 This is a structural diagram of an embodiment of the low-voltage lead structure provided by the present invention when the longitudinal rows are in a normal position;
[0025] Figure 4 This is a structural schematic diagram of an embodiment of the low-voltage lead structure provided by the present invention when the longitudinal row is at the left extreme position;
[0026] Figure 5This is a structural diagram of an embodiment of the low-voltage lead structure provided by the present invention when the longitudinal row is at an extreme position;
[0027] Figure 6 A partial structural diagram of an embodiment of a low-voltage lead structure provided by the utility model;
[0028] Figure 7 This is a schematic diagram of the partial structure of an embodiment of the low-voltage lead structure provided by the present invention.
[0029] Description of Figure Numbers:
[0030] 100. Low-voltage lead structure; 1. Low-voltage lead; 11. Winding row; 11a. A-phase winding row; 11b. B-phase winding row; 11c. C-phase winding row; 111. Inner winding row; 112. Outer winding row; 12. Busbar; 13. Longitudinal row; 13a. A-phase longitudinal row; 13b. B-phase longitudinal row; 13c. C-phase longitudinal row; 131. Arc-shaped hole; 14. Flexible connection row; 14a. A-phase flexible connection row; 14b. B-phase flexible connection row; 14c. C-phase flexible connection row; 15. Horizontal row; 16. 0-phase longitudinal row; 17. 0-phase flexible connection row; 2. Terminal box; 21. Square tube; 22. Connection panel; 23. Sealing gasket; 24. Sealing gasket limiter; 3. Bushing mounting parts; 4. Low-voltage bushing; 5. Low-voltage coil; 6. Transformer box wall.
[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0035] New energy transformers boost the voltage of electricity generated by wind and photovoltaic power and connect it to the grid, and are an important part of the new power system. According to the applicant's observation and research, the use scenarios of new energy transformers are relatively complex. Wind farms and solar fields are often distributed in high-altitude, desert, offshore and other environments with different altitudes and environmental pollution levels, which puts different requirements on the insulation distance of the transformer. When changing the insulation distance of the transformer, it is usually necessary to adjust it according to the phase spacing of the low-voltage bushing. The phase spacing of the low-voltage bushing needs to be designed according to the external environmental requirements and safety regulations. After determining the phase spacing of the low-voltage bushing, the lead structure of the transformer is designed accordingly. However, the lead structure of a transformer can usually only adapt to a few situations with different phase spacings of low-voltage bushings, and is not universal. In application scenarios in different environments, the lead structure of the transformer often needs to be redesigned. This situation makes it difficult to shorten the design cycle of the transformer construction project, which is not conducive to reducing construction costs.
[0036] In view of this, it is necessary to propose a low-voltage lead structure to solve the above technical problems.
[0037] See also Figure 1 and Figure 2In one embodiment of the present invention, a low-voltage lead structure 100 includes a low-voltage lead 1, wherein the low-voltage lead 1 includes a bus bar 12, a transverse row 15, three winding rows 11, three longitudinal rows 13, and a flexible connection row 14 corresponding to the three longitudinal rows 13. The winding row 11 includes an inner winding row 111 and an outer winding row 112, and the outer winding row 112 is connected to the bus bar 12; both ends of the longitudinal row 13 are spaced apart and have at least two arc-shaped holes. 131, the centers of at least two arc-shaped holes 131 at each end coincide; the longitudinal row 13 is rotatably connected to the soft connection row 14 through at least two arc-shaped holes 131 at one end thereof, two of the three longitudinal rows 13 are rotatably connected to the transverse row 15 through at least two arc-shaped holes 131 at the other end thereof, and the transverse row 15 is connected to the inner winding row 111, and the remaining longitudinal row 13 is rotatably connected to the inner winding row 111 through at least two arc-shaped holes 131 at the other end thereof.
[0038] Specifically, the low voltage lead 1 is mainly used to adjust the phase spacing in the low voltage lead structure 100. The low voltage lead 1 includes a winding row 11, a bus bar 12, a longitudinal row 13, a flexible connection row 14 and a transverse row 15. Figure 2 There are three winding rows 11, corresponding to phases a, b, and c respectively. Figure 2 From left to right in the middle are the a-phase winding row 11a, the b-phase winding row 11b and the c-phase winding row 11c. Correspondingly, the longitudinal rows 13 corresponding to the winding rows 11 of the three phases a, b and c are provided with the a-phase longitudinal row 13a, the b-phase longitudinal row 13b and the c-phase longitudinal row 13c. Among them, in order to meet the spacing setting between the low-voltage bushings 4 under normal circumstances, it is necessary to adjust the spacing between the longitudinal rows 13 through the transverse row 15. For example, in this embodiment, the vertical center axis of the b-phase winding row 11b is generally set to coincide with the vertical center axis of the low-voltage bushing 4 corresponding to b, so that the b-phase winding row 11b is directly connected to the b-phase longitudinal row 13b, and the b-phase longitudinal row 13 is connected to the corresponding low-voltage bushing 4 through the b-phase soft connection row 14b; and in order to control the spacing between the longitudinal rows 13, the a-phase winding row 11a is connected to the a-phase longitudinal row 13a through the transverse row 15, and the c-phase winding row 11c is connected to the c-phase longitudinal row 13c through the transverse row 15, so that the current in the a-phase and c-phase currents are gathered in the direction of the b-phase, and finally connected to the low-voltage bushings 4 corresponding to the a-phase and c-phase through the a-phase soft connection row 14a and the c-phase soft connection row 14c, and the current is delivered to the outside of the transformer. In other embodiments, one of the a-phase winding row 11a and the c-phase winding row 11c can be directly connected to its corresponding longitudinal row 13, and the winding rows 11 of the other two phases can be connected to the other two corresponding longitudinal rows 13 through the transverse rows 15. The installation position and length of the transverse rows 15 can be flexibly designed according to actual conditions.
[0039] More specifically, the winding rows 11 each include an inner winding row 111 and an outer winding row 112. In this embodiment, the outer winding row 112 of each phase is connected to the busbar 12. The inner winding row 111 of phase a is connected to the longitudinal row 13a of phase a via the transverse row 15. The inner winding row 111 of phase c is connected to the longitudinal row 13c of phase c via the transverse row 15. The inner winding row 111 of phase b is directly connected to the longitudinal row 13b of phase b. At least two arc-shaped holes 131 are provided at both ends of the longitudinal row 13 of each phase. The centers of the at least two arc-shaped holes 131 are the same. Figure 2 At the upper and lower ends of the longitudinal row 13, four concentric arc holes 131 are respectively provided. The four arc holes 131 at the same end are located in the same circular ring, that is, the four arc holes 131 at the same end are four equal arcs on a circular ring, and the center of each equal arc is the same, and the center of each arc is located at the center point of the circular ring. The a-phase longitudinal row 13a is connected to the a-phase soft-connection row 14a through the four arc-shaped holes 131 at its upper end, so that the two can rotate relative to each other, and is connected to the transverse row 15 through the four arc-shaped holes 131 at its lower end, so that the a-phase longitudinal row 13a can rotate around the transverse row 15; the b-phase longitudinal row 13b is connected to the b-phase soft-connection row 14b through the four arc-shaped holes 131 at its upper end, so that the two can rotate relative to each other, and is connected to the inner winding row 111 of the b-phase winding row 11b through the four arc-shaped holes 131 at its lower end, so that the b-phase longitudinal row 13b can rotate around the inner winding row 111 of the b-phase; the c-phase longitudinal row 13c is connected to the c-phase soft-connection row 14c through the four arc-shaped holes 131 at its upper end, so that the two can rotate relative to each other, and is connected to the transverse row 15 through the four arc-shaped holes 131 at its lower end, so that the c-phase longitudinal row 13c can rotate around the transverse row 15. Through this arrangement, the longitudinal rows 13 of each phase can rotate, so that the longitudinal rows 13 of each phase can drive the soft connection rows 14 of each phase to move, and then the spacing between the soft connection rows 14 of each phase is changed, and finally the spacing requirements of the low-voltage bushings 4 of each phase under different environments are met, so that the phase spacing adjustment can be completed without redesigning other wiring of the low-voltage lead 1.
[0040] By providing at least two arc-shaped holes 131 on the longitudinal row 13, the longitudinal row 13 and the flexible connection row 14 can rotate within a certain range, rather than setting the longitudinal row 13 to be able to rotate 360° around the transverse row 15 or the winding row 11. The reason is to ensure the contact area between the longitudinal row 13 and other connection rows to avoid affecting the current transmission efficiency or generating large transmission losses.
[0041] See also Figures 3 to 5Taking the connection between the a-phase longitudinal row 13a and the transverse row 15 and the a-phase flexible connecting row 14a in this embodiment as an example, under normal conditions where the phase spacing does not need to be adjusted, the vertical center axis of the a-phase longitudinal row 13a and the a-phase flexible connecting row 14a coincide with each other, the a-phase longitudinal row 13a and the transverse row 15 are arranged perpendicularly, and the a-phase flexible connecting row 14a is directly connected to the low-voltage bushing 4 corresponding to a; when the spacing between the low-voltage bushings 4 changes, the position of the flexible connecting row 14 needs to be adjusted accordingly, please refer to Figure 4 and Figure 5 The a-phase longitudinal row 13a can rotate around the transverse row 15, and the range of rotation is the opening angle range of the arc-shaped hole 131, that is, the rotation range of the a-phase longitudinal row 13a is the range between the left limit position and the right limit position. In order to ensure the connection between the a-phase soft connection row 14a and the low-voltage bushing 4 corresponding to a, the a-phase soft connection row 14a needs to rotate to the right accordingly when the a-phase longitudinal row 13a rotates to the left, so that it always remains in a vertical state, that is, the rotation directions of the a-phase longitudinal row 13a and the a-phase soft connection row 14a are opposite, and the rotation angles are the same.
[0042] It should be noted that in this embodiment, the flexible connecting strip 14 is made of one of copper and aluminum strips, and 5, 7, or 9 strips can be used as appropriate. Specifically, a 0.1-0.4 mm thick copper strip is generally folded in half and tinned. After the fold, circular holes are opened at both ends. The number of circular holes is determined by the number of holes in the longitudinal strip 13 and the low-voltage bushing 4. This arrangement gives the flexible connecting strip 14 a certain degree of vertical flexibility, allowing it to adapt to changes in the height direction of the flexible connecting strip 14 caused by the rotation of the longitudinal strip 13, so that it can still be connected to its corresponding low-voltage bushing 4 after rotation, and avoids the situation where the low-voltage bushing 4 is compressed and causes excessive stress.
[0043] In this embodiment, the spacing between the low-voltage bushings 4 is usually set to 100-300mm, the central angle of the arc hole 131 is 20°, and the distance between the centers of the arc holes 131 at the upper and lower ends of the longitudinal row 13 is 200mm, so that the longitudinal row 13 and the soft connection row 14 can rotate within the range of ±10°, and the horizontal spacing between the left extreme position and the right extreme position and the normal position is about 35mm, and the height difference is about 3mm.
[0044] In the embodiment provided by the present invention, the low-voltage lead structure 100 includes a low-voltage lead 1, wherein the low-voltage lead 1 includes a bus 12, a transverse row 15, three winding rows 11, three longitudinal rows 13 and a soft connection row 14 arranged in a one-to-one correspondence with the longitudinal rows 13, the winding row 11 includes an inner winding row 111 and an outer winding row 112, and the outer winding row 112 is connected to the bus 12; at least two arc-shaped holes 131 are spaced apart at both ends of the longitudinal row 13, and the centers of the at least two arc-shaped holes 131 at each end coincide; the longitudinal row 13 is rotatably connected to the soft connection row 14 through at least two arc-shaped holes 131 at one end thereof, wherein two longitudinal rows 13 are rotatably connected to the transverse row 15 through at least two arc-shaped holes 131 at the other end thereof, and the transverse row 15 is connected to the inner winding row 111, and the other longitudinal row 13 is rotatably connected to the inner winding row 111 through at least two arc-shaped holes 131 at the other end. Through this arrangement, when the phase spacing of the transformer needs to be adjusted in different environments, it is only necessary to rotate the longitudinal row 13 and the flexible connection row 14 within the range of the arc hole 131 to change the spacing of the flexible connection row 14, and connect the flexible connection row 14 to the low-voltage bushing 4. The phase spacing can be adjusted without repeatedly designing the lead structure of the transformer. A universal solution for the transformer lead structure design can be formed, thereby effectively shortening the design cycle and saving project costs.
[0045] Furthermore, the connection method of the low voltage lead 1 of the transformer is usually a triangle connection (D connection) or a star connection (Y connection), please refer to Figure 2 In one embodiment of the present invention, the low-voltage lead structure 100 adopts a Y connection. The low-voltage lead 1 also includes a 0-phase longitudinal row 16 and a 0-phase soft connection row 17 corresponding to the 0-phase longitudinal row 16. Both ends of the 0-phase longitudinal row 16 are provided with at least two arc-shaped holes 131 with the same center. The 0-phase longitudinal row 16 is rotatably connected to the 0-phase soft connection row 17 through the at least two arc-shaped holes 131 at one end thereof, and the 0-phase longitudinal row 16 is rotatably connected to the busbar 12 through the at least two arc-shaped holes 131 at the other end thereof. Specifically, Figure 2 From left to right in the figure are respectively the a-phase longitudinal row 13a, the b-phase longitudinal row 13b, the c-phase longitudinal row 13c and the 0-phase longitudinal row 16. The 0-phase longitudinal row 16 is directly connected to the bus 12, and in order to adjust the spacing between the 0-phase longitudinal row 16 and the other-phase longitudinal rows 13, at least two arc-shaped holes 131 are also provided at the upper and lower ends of the 0-phase longitudinal row 16, respectively. The arc-shaped holes 131 provided on the 0-phase longitudinal row 16 are the same in shape, position, size and central angle as the arc-shaped holes 131 provided on the other-phase longitudinal rows 13. The beneficial effects that can be achieved by the arc-shaped holes 131 of the 0-phase longitudinal row 16 are the same as the beneficial effects that can be achieved by the arc-shaped holes 131 of the other-phase longitudinal rows 13, and will not be repeated here.
[0046] In another embodiment of the present invention, the low-voltage lead structure 100 adopts D-connection, and the 0-phase longitudinal row 16 and the 0-phase soft connection row 17 corresponding to the 0-phase longitudinal row 16 are no longer provided.
[0047] It should be noted that the 0-phase longitudinal row 16 in the embodiment of the present invention refers to the neutral point lead-out row when the transformer lead structure adopts Y connection, which can ensure the independent operation of the three-phase load. Even if the load is asymmetric, the neutral line can maintain equal voltage for each phase load to ensure the stable operation of the power system; at the same time, the neutral point lead-out row provides a grounding path. When the transformer leaks, it can quickly conduct the current to the ground to avoid electric shock accidents and ensure the personal safety of users.
[0048] Furthermore, one end of each of the three longitudinal rows 13 is connected to its corresponding flexible connection row 14 by bolts, wherein the other ends of two longitudinal rows 13 are connected to the transverse row 15 by bolts, and the other end of another longitudinal row 13 is connected to the inner winding row 111 by bolts; one end of the 0-phase longitudinal row 16 is bolted to the 0-phase flexible connection row 17, and the other end thereof is bolted to the busbar 12; the bolts pass through the arc-shaped holes 131 accordingly, and the bolts can slide in the arc-shaped holes 131. Specifically in this embodiment, the a-phase longitudinal row 13a is connected to the transverse row 15 and the a-phase flexible connection row 14a by bolts; the b-phase longitudinal row 13b is connected to the b-phase flexible connection row 14b and the inner winding row 111 of the b-phase winding row 11b by bolts; and the c-phase longitudinal row 13c is connected to the transverse row 15 and the c-phase flexible connection row 14c by bolts. A circular hole is provided on each phase soft connection row 14 at a position corresponding to the arc hole 131, and bolts are passed through the arc hole 131 and the circular hole to connect the longitudinal row 13 of each phase with its corresponding soft connection row 14; a circular hole corresponding to the arc hole 131 at the lower end of the a-phase transverse row 15 is provided on the transverse row 15 corresponding to the a-phase longitudinal row 13a, and bolts are passed through the arc hole 131 and the circular hole to connect the a-phase longitudinal row 13a and the transverse row 15; a circular hole is provided on the inner winding row 111 of the b-phase winding row 11b at a position corresponding to the arc hole 131 at the lower end of the b-phase longitudinal row 13b, and bolts are used to connect the b-phase longitudinal row 13b The arc-shaped hole 131 at the lower end is connected to the circular hole in the b-phase winding row 11b, so that the b-phase longitudinal row 13b is connected to the b-phase winding row 11b; a circular hole corresponding to the arc-shaped hole 131 at the lower end of the c-phase transverse row 15 is opened on the transverse row 15 corresponding to the c-phase longitudinal row 13c, and the bolt passes through the arc-shaped hole 131 and the circular hole to connect the c-phase longitudinal row 13c and the transverse row 15; a circular hole corresponding to the arc-shaped hole 131 at the lower end of the 0-phase row is opened on the bus 12, and the bolt passes through the arc-shaped hole 131 at the lower end of the 0-phase longitudinal row 16 and the circular hole on the bus 12 to connect the 0-phase longitudinal row 16 and the bus 12.
[0049] In one embodiment of the present invention, the transformer low-voltage lead structure 100 further includes an outlet box 2 and a bushing mounting member 3. The bushing mounting member 3 is provided with a through hole for mounting a low-voltage bushing 4. The low-voltage bushing 4 is connected to the flexible connection bar 14 in a one-to-one correspondence. The bushing mounting member 3 is detachably mounted on the side of the outlet box 2 away from the flexible connection bar 14. For details, please refer to Figure 1 、 Figure 6 and Figure 7 , each phase soft connection row 14 is connected to its corresponding low-voltage bushing 4, and the low-voltage bushing 4 is installed in the through hole opened on the bushing mounting member 3. By setting the bushing mounting member 3 and the outlet box 2 to be detachable, the outlet box 2 can be installed with bushing mounting members 3 with different opening spacings. When the phase spacing needs to be adjusted, the phase spacing is first determined according to the environment and safety standards, and then the low-voltage bushing 4 is installed in the through hole of the bushing mounting member 3. Subsequently, the bushing mounting member 3 is installed on the side of the outlet box 2 away from the soft connection row 14, and the longitudinal row 13 and the soft connection row 14 are rotated according to the spacing between the low-voltage bushings 4 after adjustment to adjust the spacing of the soft connection row 14 so that it is suitable for connecting the low-voltage bushing 4. Finally, the low-voltage bushing 4 is connected to the soft connection row 14, and the phase spacing adjustment is finally completed without the need to design a new model of low-voltage lead structure 100.
[0050] Furthermore, in one embodiment of the present invention, the outlet box 2 includes a square tube 21 and a connection panel 22. The connection panel 22 is provided with a square hole capable of accommodating the square tube 21. The square tube 21 is fixedly connected to the connection panel 22 through the square hole. The sleeve mounting member 3 is detachably mounted on the connection panel 22. Figure 1 、 Figure 6 and Figure 7 The four sides of the square tube 21 are welded to the holes in the transformer tank wall 6. The connection panel 22 is inserted through the square holes and welded to the four sides of the square tube 21. It is located at the end of the square tube 21 away from the flexible connector bar 14 and is arranged parallel to the transformer tank wall 6. On this basis, the bushing mounting member 3 is detachably mounted on the connection panel 22.
[0051] Furthermore, a sealing gasket 23 is provided between the bushing mounting member 3 and the connection panel 22. The sealing gasket 23 has a receiving hole that can accommodate the low-voltage bushing 4. Specifically, the receiving hole provided by the sealing gasket 23 is roughly the same shape and size as the square hole provided by the connection panel 22. The low-voltage bushing 4 can successively pass through the receiving hole provided by the sealing gasket 23, the square hole provided by the connection panel 22, and the cavity of the square tube 21 to extend into the interior of the transformer and connect to the flexible connecting bar 14. By providing the sealing gasket 23 between the bushing mounting member 3 and the connection panel 22, the leakage of transformer oil can be effectively prevented, the sealing performance of the transformer can be ensured, and thus its reliability and service life can be improved. The material of the sealing gasket 23 includes one of acrylic ester and high-quality nitrile rubber.
[0052] In addition, a plurality of gasket retainers 24 are provided on one side of the connection panel 22 where it connects to the sleeve mounting member 3. The gasket 23 is positioned between the plurality of gasket retainers 24, and the gasket retainers 24 are used to secure the gasket 23. Specifically, the gasket retainers 24 are welded or bolted to the outer edge of the connection panel 22. At least two gasket retainers 24 are welded to each side of the connection panel 22. In this embodiment, two to eight gasket retainers 24 are welded to each side. The gasket 23 is slightly larger than the space between the gasket retainers 24, allowing the gasket 23 to be secured between the gasket retainers 24. This arrangement prevents the gasket retainers 24 from falling out when not supported by the sleeve mounting member 3. This allows the gasket 23 to remain in place when the sleeve mounting member 3 is replaced or repaired, eliminating the need to reinstall the gasket 23. This improves the efficiency of replacing and repairing the sleeve mounting member 3.
[0053] It should be noted that in this embodiment, the cross-sectional dimensions of the square tube 21 are determined by the size of the through-hole provided in the transformer tank wall 6. The length and width of the cross-section of the square tube 21 parallel to the transformer tank wall 6 must be less than 1 mm or 2 mm of the length and width of the through-hole to facilitate welding. Furthermore, the connection panel 22 includes a flange plate of the outlet box 2, and the bushing mounting member 3 includes a bushing flange. Holes for mounting bolts are provided on the connection panel 22. The holes are 15 to 35 mm from the edge of the connection panel 22, and the spacing between the holes does not exceed 120 mm to avoid affecting the sealing performance of the transformer. Similarly, holes are provided at corresponding locations on the sealing gasket 23 and the bushing mounting member 3 to facilitate bolt connection.
[0054] In one embodiment of the present invention, the low-voltage lead structure 100 further includes three low-voltage coils 5 of different phases, and the three low-voltage coils 5 of different phases are connected to the three winding rows 11 in a one-to-one correspondence. Figure 1 ,exist Figure 1 Among the low-voltage coils 5, from right to left are the a-phase low-voltage coil 5, the b-phase low-voltage coil 5 and the c-phase low-voltage coil 5, which are respectively connected to the a-phase winding row 11a, the b-phase winding row 11b and the c-phase winding row 11c.
[0055] The starting section of each low-voltage coil 5 is connected to the inner winding row 111, and the terminal section of the low-voltage coil 5 is connected to the outer winding row 112. To save material for the winding row 11, in this embodiment, the height of the low-voltage coil 5 is set to H, and the length of the outer winding row 112 is set to 1 / 3 to 2 / 3 of the height H of the low-voltage coil 5. The inner winding row 111 adopts a chamfered design, with its bottom retaining 5 to 20 mm in the width direction and a chamfered angle in the height direction, cutting off a length of H-(5-20 mm) in the height direction, ultimately forming a chamfer on the inner winding row 111 of each phase. On this basis, the position of the terminal section of the low-voltage coil 5 connected to the outer winding row 112 is adaptively adjusted according to the height of the outer winding row 112.
[0056] The present invention also proposes a transformer, which includes a low-voltage lead structure 100. The specific structure of the low-voltage lead structure 100 refers to the above embodiment. Since the 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 described one by one here.
[0057] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A low voltage lead structure, characterized in that: include: A low-voltage lead, comprising a busbar, a transverse row, three winding rows, three longitudinal rows, and a flexible connection row corresponding to each of the three longitudinal rows, wherein the winding rows comprise an inner winding row and an outer winding row, and the outer winding row is connected to the busbar; At least two arc-shaped holes are spaced apart at both ends of the longitudinal row, and the centers of at least two of the arc-shaped holes at each end coincide with each other; The longitudinal row is rotatably connected to the soft connection row through at least two of the arc-shaped holes at one end thereof, two of the three longitudinal rows are rotatably connected to the transverse row through at least two of the arc-shaped holes at the other end thereof, and the transverse row is connected to the inner winding row, and the remaining longitudinal row is rotatably connected to the inner winding row through at least two of the arc-shaped holes at the other end thereof.
2. The low-voltage lead structure according to claim 1, wherein: The low-voltage lead also includes a 0-phase longitudinal row and a 0-phase soft connection row arranged corresponding to the 0-phase longitudinal row. Both ends of the 0-phase longitudinal row are provided with at least two arc-shaped holes with the same center. The 0-phase longitudinal row is rotatably connected to the 0-phase soft connection row through at least two arc-shaped holes at one end thereof, and the 0-phase longitudinal row is rotatably connected to the bus through at least two arc-shaped holes at the other end thereof.
3. The low-voltage lead structure according to claim 2, wherein: One end of each of the three longitudinal rows is connected to the corresponding flexible connection row via a bolt, the other ends of two of the longitudinal rows are connected to the transverse row via a bolt, and the other end of another longitudinal row is connected to the inner winding row via a bolt; One end of the 0-phase longitudinal row is bolted to the 0-phase flexible connection row, and the other end is bolted to the busbar; The bolts pass through the arc-shaped holes accordingly, and the bolts can slide in the arc-shaped holes.
4. The low-voltage lead structure according to claim 1, wherein: The low-voltage lead structure also includes an outlet box and a bushing mounting piece. The bushing mounting piece is provided with a through hole for installing a low-voltage bushing. The low-voltage bushing is connected to the flexible connection row in a one-to-one correspondence. The bushing mounting piece is detachably mounted on a side of the outlet box away from the flexible connection row.
5. The low voltage lead structure according to claim 4, wherein: The outlet box includes a square tube and a connection panel. The connection panel is provided with a square hole capable of accommodating the square tube. The square tube is fixedly connected to the connection panel through the square hole. The sleeve mounting piece is detachably mounted on the connection panel.
6. The low-voltage lead structure according to claim 5, wherein: A sealing gasket is provided between the bushing mounting piece and the connection panel, and the sealing gasket is provided with an accommodating hole capable of accommodating the low-voltage bushing to pass through.
7. The low-voltage lead structure according to claim 6, wherein: A plurality of sealing gasket stoppers are provided on one side where the connection panel is connected to the sleeve mounting piece. The sealing gasket is arranged between the plurality of sealing gasket stoppers, and the sealing gasket stoppers are used to fix the sealing gasket.
8. The low voltage lead structure according to claim 1, wherein: The low-voltage lead structure further includes three low-voltage coils with different phases, and the three low-voltage coils with different phases are connected to the three winding rows in a one-to-one correspondence.
9. The low-voltage lead structure according to claim 8, wherein: The starting section of the low-voltage coil is connected to the inner winding row, and the ending section of the low-voltage coil is connected to the outer winding row.
10. A transformer, characterized in that: The invention comprises the low-voltage lead structure according to any one of claims 1 to 9.