A transformer

Abstract

This invention pertains to the field of general transformer components, specifically providing a transformer. The transformer includes a casing and a transformer body located within the casing. The low-voltage side of the transformer body is electrically connected to a terminal block via a flexible connector. A bracket for suspending the terminal block is provided on the casing, located at the top of the casing and directly above the terminal block. This invention effectively prevents loosening of the connecting bolts between the terminal block and the low-voltage side of the transformer, while ensuring a greater insulation distance between the high-voltage cable and the high-voltage side, thereby improving safety. Simultaneously, it ensures ample space between the terminal block and the top of the casing, facilitating connection between the terminal block and the low-voltage switchgear.

Description

Technical Field

[0001] This invention pertains to the field of general components of transformers, and in particular relates to a transformer. Background Technology

[0002] Dry-type transformers have advantages such as no leakage, fewer accessories, simple maintenance, and no risk of fire or explosion, and are now widely used in power systems such as power generation, distribution, and consumption. The main body of a dry-type transformer generally includes an iron core, high-voltage coil, low-voltage coil, upper clamp, lower clamp, and fixed base. Considering heat dissipation, dry-type transformers are usually equipped with cooling fans, such as the dry-type transformer structure disclosed in utility model patent with authorization announcement number CN221812045U.

[0003] During normal use, dry-type transformers inevitably generate vibration and noise. For example, core vibration is caused by the magnetostriction of silicon steel sheets; core vibration is caused by electromagnetic attraction due to leakage flux at the joints and between laminations of silicon steel sheets; and coil vibration is caused by leakage flux generated by the load current in the windings. Furthermore, the fan in the cooling fan directly generates vibration during operation, and vibrations from other parts of the transformer are transmitted to the cooling fan, exacerbating its vibration. In some cases, dry-type transformers are directly mounted on mobile equipment (such as tunnel boring machines), and the vibrations generated by the equipment itself during operation are also transmitted to the transformer.

[0004] When dry-type transformers and low-voltage switchgear are arranged side-by-side, the low-voltage side connection often uses a side-outgoing busbar (usually a copper busbar). This method typically involves mounting a bracket on the transformer body to support the busbar, with bolts connecting the busbar to the transformer body. During long-term operation, vibrations generated by the transformer body are transmitted to the connection points of the busbar, easily causing the bolts to loosen, thus posing a potential safety hazard to the power supply.

[0005] A search revealed that a utility model patent with authorization announcement number CN219916848U discloses a transformer. The transformer includes a shell, a transformer body, copper busbars, a support assembly, and flexible connectors. The copper busbars are connected to the low-voltage side of the transformer body through flexible connectors. The front of the shell is provided with a cabinet door. The support assembly includes a first support extending in the front-back direction and second supports located at both ends of the first support. The first support is connected to the front and back sides of the shell through the second supports at both ends to support the copper busbars.

[0006] Although the purpose of setting up a bracket assembly to connect the copper busbar to the outer casing in the above patent is to improve the versatility of the bracket, objectively speaking, the use of a soft connection between the copper busbar and the low-voltage side of the transformer body in the above patent can reduce the transmission of the transformer body's vibration to the copper busbar through the connection point. In addition, the outer casing is relatively stable during use, which can also prevent the vibration of the transformer body from being transmitted to the copper busbar through the bracket, thereby reducing the risk of bolt loosening.

[0007] However, in the aforementioned patent, the bracket assembly is installed on the front and rear sides inside the casing. This still presents two major problems: First, the bracket assembly (first bracket) is quite long, actually "penetrating" both the high-voltage and low-voltage sides of the transformer body. The part of the bracket assembly on the high-voltage side is close to the incoming cable on the high-voltage side, resulting in a short electrical insulation distance and insufficient safety. Second, in order for the bracket assembly to stably support the copper busbar, at least one bracket should be set at the phase-to-phase position of each phase terminal on the low-voltage side of the transformer body. The phase-to-phase position generally corresponds to the cabinet door position of the casing. In this case, the bracket can only be connected to the top (above the cabinet door) of the front and rear sides of the casing. The reserved space for the copper busbar to connect to the low-voltage cabinet is very limited. The busbar of the low-voltage cabinet is larger in size and also requires a larger space to connect normally with the copper busbar of the low-voltage cabinet. Summary of the Invention

[0008] The purpose of this invention is to provide a transformer that solves the technical problems in the prior art, such as insufficient safety and inconvenience in connecting the output busbar to the low-voltage switchgear, caused by the brackets supporting the output busbars being installed inside the casing on the front and rear sides.

[0009] To achieve the above objectives, the technical solution for the transformer provided by this invention is as follows: A transformer includes a casing and a transformer body located inside the casing. The low-voltage side of the transformer body is electrically connected to a lead bus via a flexible connector. The casing is provided with a bracket for supporting the lead bus, which is located at the top of the casing and directly above the lead bus.

[0010] As a further improvement, the bracket includes a connecting rod with an external thread at its top, and the top of the connecting rod passes through the top of the housing. Locking nuts are connected to the connecting rod at the inner and outer sides of the top of the housing to fix the connecting rod at the top of the housing.

[0011] As a further improvement, a pad is installed between the locking nut and the top of the housing, and a first damping pad is installed between the pad and the top of the housing.

[0012] As a further improvement, a first damping pad is installed between the locking nut and the top of the housing.

[0013] As a further improvement, the bottom end of the connecting rod is provided with an external thread, and an insulating upper clamping block and a lower clamping block are fitted on the bottom end of the connecting rod. The upper clamping block and the lower clamping block are respectively clamped at the upper and lower ends of the cable outlet. The bottom end of the connecting rod is also connected with clamping nuts located on the upper side of the upper clamping block and the lower side of the lower clamping block respectively, so that the upper clamping block and the lower clamping block clamp the cable outlet.

[0014] As a further improvement, the transformer is a dry-type transformer, and a second vibration damping pad is provided between the pad block of the transformer body and the coil.

[0015] As a further improvement, the second damping pad has a protrusion and the pad block has a concave portion, with the protrusion embedded in the concave portion to fix the second damping pad and the pad block.

[0016] As a further improvement, the transformer is a dry-type transformer, and a vibration damper is connected between the lower clamp of the transformer body and the fixed base.

[0017] As a further improvement, a shim is provided between the shock absorber and the lower clamp to elevate the portion above the lower clamp.

[0018] As a further improvement, the transformer is a dry-type transformer, with a cooling fan installed on the fixed base of the transformer body, and a third vibration damping pad between the cooling fan and the fixed base.

[0019] This invention relates to an invention based on element modification. Its beneficial effects are as follows: the outgoing line busbar is connected to the low-voltage side of the transformer body via a flexible connector, which greatly reduces the transmission of vibrations generated by the transformer body to the outgoing line busbar. Simultaneously, the outgoing line busbar is suspended on the outer casing by a bracket, and the outer casing is relatively stable during use. This also prevents vibrations from the transformer body from being transmitted to the outgoing line busbar through the bracket, thereby solving the problem of bolts easily loosening during long-term operation of the transformer.

[0020] The support bracket for the cable outlet is located on the top of the transformer housing, directly above the cable outlet. This position keeps the bracket far from the high-voltage side of the transformer, ensuring a greater insulation distance between the high-voltage cables and the high-voltage side, thus improving safety. Furthermore, the top of the housing provides numerous mounting points for the bracket, allowing for flexible adjustments to its vertical length based on actual conditions. For example, the bracket can be appropriately lengthened to ensure ample space between the cable outlet and the top of the housing, facilitating connection between the cable outlet and the low-voltage switchgear. Attached Figure Description

[0021] Figure 1 This is a front view of the transformer body in an embodiment of the present invention; Figure 2 This is a side view of the transformer body in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the installation and assembly of the lead busbar and the housing in an embodiment of the transformer of the present invention; Figure 4 for Figure 3 A magnified view of the location of the central support; Figure 5 for Figure 1 Schematic diagram of the installation and assembly of the middle pad and the second vibration damping pad; Figure 6 for Figure 1 Top view of the middle shock absorber (top cover hidden); Figure 7 for Figure 1 Front view of the middle vibration damper; Figure 8 This is a schematic diagram showing the installation and assembly of the low-voltage coil and iron core of the transformer body in an embodiment of the present invention. Figure 9 for Figure 2 A schematic diagram showing the installation and assembly of the intermediate cooling fan and the fixed base.

[0022] Explanation of reference numerals in the attached figures: 1. Iron core; 2. Upper clamp; 3. High-voltage coil; 4. Vibration damper; 5. Fixed base; 6. Lower clamp; 7. Pad; 8. Cooling fan; 9. Elevating material; 10. Housing; 11. Bracket; 12. Outlet cable; 13. Flexible connector; 14. Low-voltage cabinet connection; 15. Second vibration damping pad; 16. Low-voltage coil; 17. Silicone rod; 18. Third vibration damping pad; 19. Angle steel; 401. Vibration damping base; 402. Fixed mounting hole; 403. Spring mounting hole; 404. Top cover; 405. Connecting bolt; 1101. Connecting rod; 1102. Pad; 1103. Locking nut; 1104. First vibration damping pad; 1105. Upper clamp; 1106. Lower clamp; 1107. Clamping nut. Detailed Implementation

[0023] In order to provide a transformer that can effectively prevent the connecting bolts between the outgoing line busbar and the low-voltage side of the transformer from loosening, and has high safety and facilitates the connection between the outgoing line busbar and the low-voltage switchgear, the basic technical concept of this invention is to connect the low-voltage side of the transformer body to the outgoing line busbar through a flexible connector, and to set the support bracket for hoisting and supporting the outgoing line busbar at the top of the outer shell and directly above the outgoing line busbar.

[0024] Based on the above concept, the present invention will be further described in detail below with reference to the embodiments.

[0025] As a basic embodiment, with Figures 1-3 and Figure 8Taking the dry-type transformer shown as an example, the transformer provided in this embodiment includes a housing 10 and a transformer body located inside the housing 10. The basic structure of the transformer body is basically the same as that of existing dry-type transformers, specifically including an iron core 1, an upper clamp 2, a lower clamp 6, a high-voltage coil 3, a low-voltage coil 16, a fixed base 5, a pad 7, a cooling fan 8, etc. It has a high-voltage side and a low-voltage side. The specific working principle of the transformer is well known in the art and will not be described in detail here. The low-voltage side of the transformer body is electrically connected to the output busbar 12 through a flexible connector 13. The output busbar 12 can be made of copper. Of course, other embodiments do not completely exclude the use of output busbars 12 made of other conductive metals. The flexible connector 13 can be any existing technology, and the specific type is not limited. Compared with the method of connecting the low-voltage side to the output busbar 12 through a hard connection structure, the flexible connector 13 can play a vibration isolation role, which can minimize the transmission of the vibration of the transformer body to the output busbar 12, thereby improving the problem of loosening of the bolts connecting the output busbar 12 caused by the vibration of the transformer body.

[0026] The outer casing 10 is equipped with a bracket 11 for suspending the cable outlet 12. This suspension can be understood as suspending (hoisting) and supporting the cable outlet 12. During normal use, the outer casing 10 is on a relatively fixed foundation. Compared with placing the bracket 11 on the transformer body, this also avoids the vibration of the transformer body being transmitted to the cable outlet 12 through the bracket 11. In conjunction with the flexible connector 13, this solves the problem of the bolts connecting the cable outlet 12 becoming loose due to the vibration of the transformer body.

[0027] The bracket 11 is located at the top of the housing 10 and directly above the cable outlet 12. Compared to connecting the bracket 11 to the front and rear sides inside the housing 10, this arrangement allows the bracket 11 to be further away from the high-voltage side of the transformer body, ensuring a greater insulation distance between the high-voltage cable and the high-voltage side, thus improving safety. Furthermore, the top of the housing 10 provides numerous mounting points for the bracket 11, allowing for flexible adjustment of its vertical length based on actual conditions. Figure 3 For example, the bracket 11 can be lengthened appropriately to ensure that there is a large space between the outlet busbar 12 and the top of the housing, and a vertically longer low-voltage cabinet connection part 14 can be set on the outlet busbar 12 to connect with the larger-sized busbar of the low-voltage cabinet, thereby facilitating the connection between the outlet busbar 12 and the low-voltage cabinet.

[0028] As a preferred embodiment, such as Figure 4As shown, the bracket 11 includes a connecting rod 1101, the top of which has an external thread (equivalent to a screw). The top of the connecting rod 1101 passes through the top of the outer shell 10. Furthermore, locking nuts 1103 are connected to the connecting rod 1101 at the inner and outer sides of the top of the shell. By tightening the inner and outer locking nuts 1103 respectively, the inner and outer sides of the top of the shell can be pressed together, thereby fixing the connecting rod 1101 to the top of the shell through the locking nuts 1103.

[0029] Compared to an alternative embodiment where the connecting rod 1101 is directly fixed (e.g., welded) to the top of the housing, in the preferred embodiment, the position can be adjusted by moving the connecting rod 1101 up and down (equivalent to a nut screw mechanism) by tightening the locking nut 1103, thereby improving the versatility of the bracket 11 and making the bracket 11 suitable for different specifications of cable outlets 12.

[0030] Based on the preferred embodiments described above, even more preferably, such as Figure 4 As shown, a pad 1102 is also provided between the locking nut 1103 and the top of the housing 10. The pad 1102 allows the locking nut 1103 to have a larger contact area with the top of the housing, thereby improving the reliability of the connecting rod 1101. Of course, in other alternative embodiments, it is not excluded that the pad 1102 is not provided, that is, the locking nut 1103 directly presses against the top of the housing.

[0031] Although the flexible connector 13 can isolate most of the vibration transmission, it cannot completely prevent vibration from being transmitted to the outgoing line 12. Furthermore, the low-voltage switchgear experiences normal operating vibration, and when the transformer is used in mobile equipment, the vibration of the low-voltage switchgear will increase, and the vibration of the casing 10 will also occur, which can also be transmitted to the outgoing line 12. As a preferred embodiment, the bracket 11 is also equipped with vibration damping pads to enhance the vibration reduction and noise reduction effect of the transformer. For ease of description, the vibration damping pads here can be defined as the first vibration damping pad 1104. Specifically, the vibration damping pads can be made of materials such as silicone or rubber, and can achieve vibration damping through their own deformation. Figure 4 For example, in the case of a configuration with a pad 1102, the first damping pad 1104 can be installed between the top of the housing and the pad 1102. In the case of a configuration without a pad 1102, the first damping pad 1104 can be directly installed between the locking nut 1103 and the top of the housing.

[0032] To further improve the versatility of the support 11, in a preferred embodiment, such as... Figure 4As shown, the bottom end of the connecting rod 1101 is provided with an external thread (equivalent to a double-ended screw). An upper clamping block 1105 and a lower clamping block 1106 are fitted onto the bottom end of the connecting rod 1101. Both the upper clamping block 1105 and the lower clamping block 1106 are made of insulating material and are respectively clamped at the upper and lower ends of the cable outlet 12. Specifically, grooves can be provided on the upper clamping block 1105 and the lower clamping block 1106. The bottom end of the connecting rod 1101 is also connected to clamping nuts 1107 located above the upper clamping block 1105 and below the lower clamping block 1106, respectively, to clamp the cable outlet 12.

[0033] In a preferred embodiment, the distance between the upper clamping block 1105 and the lower clamping block 1106 and the height of the upper clamping block 1105 and the lower clamping block 1106 can be changed by adjusting the clamping nut 1107, so that the bracket 11 can be used for different specifications of cable outlets 12, further improving versatility.

[0034] The main idea of ​​the embodiments listed above is to prevent vibration from being transmitted to the output line 12. In fact, for the transformer body, in some embodiments, vibration damping pads can also be set at corresponding positions to play the role of active vibration reduction and noise reduction.

[0035] For example, in some embodiments, such as Figure 1 and Figure 5 As shown, a vibration damping pad can be placed between the pad 7 and the coils (including the high-voltage coil 3 and the low-voltage coil 16). This vibration damping pad can be defined as the second vibration damping pad 15, and its material can be the same as the first vibration damping pad 1104. In this way, without affecting the clamping and fixing of the coils, the vibration in the vertical direction of the transformer body can be reduced, thus reducing noise. In addition, it can also prevent damage to the coil ends caused by vibration during transportation.

[0036] Specifically, such as Figure 5 As shown, taking the spacer 7 between the clamp 2 and the coil as an example, the second damping pad 15 has a protrusion, and the spacer 7 has a concave portion. For example, the protrusion can be a long rib, and the concave portion can be a groove. The protrusion is embedded into the concave portion to fix the second damping pad 15 and the spacer 7. At this time, the second damping pad 15 and the spacer 7 can be reliably fixed without the need for any additional connecting structures, which is convenient and efficient.

[0037] Alternatively, in some embodiments, such as Figure 1 and Figure 2 As shown, a vibration damper 4 is connected between the lower clamp 6 of the transformer body and the fixed base 5. Specifically, the vibration damper 4 can be a spring vibration damper 4 as used in the prior art, such as... Figure 6 and Figure 7As shown, the vibration damper 4 includes a vibration damping base 401. The vibration damping base has mounting holes 402, through which fasteners (e.g., bolts) can be installed to connect the vibration damper 4 to the fixed base 5. It should be noted that the figure shows four mounting holes 402, but in other embodiments, more mounting holes 402 may be provided, or only two or three may be provided. The fixed base 5 has four spring mounting holes 403, in which damping springs (not shown in the figure) with a set load-bearing stiffness can be installed. Simultaneously, an upper cover 404 is fitted onto the fixed base 5. The upper cover 404 is lifted by springs and is used to connect to the lower clamp 6. Specifically, a connecting bolt 405 can be provided at the top of the upper cover 404. The connecting bolt 405 passes through a through hole on the lower clamp 6 and is then connected to the upper cover 404 with a nut. Of course, in other embodiments, other forms of vibration dampers 4, such as hydraulic vibration dampers 4, are also possible. It should be noted that the number of vibration dampers 4 is not limited here, as long as it can support the portion above the lower clamp 6. By configuring vibration dampers 4, this embodiment can reduce the vibration of the iron core 1 and the coil, prevent vibration from being transmitted to the ground through the fixed base 5, and reduce noise.

[0038] Furthermore, in some embodiments, such as Figure 2 As shown, a shim 9 is provided between the shock absorber 4 and the lower clamp 6 to elevate the portion above the lower clamp 6. For example, the shim 9 can be a round steel bar fitted onto the connecting bolt 405. In this case, the portion above the lower clamp 6 can be elevated to ensure a larger insulation distance between the top surface of the shock absorber 4 and the iron core 1, eliminating the need for a larger lower clamp 6.

[0039] Alternatively, in some embodiments, such as Figure 2 and Figure 9 As shown, for example, the cooling fan 8 on the fixed base 5 is installed in place by setting an angle steel 19. A vibration damping pad is provided between the angle steel 19 and the cooling fan 8. This vibration damping pad can be defined as the third vibration damping pad 18, and the material of the third vibration damping pad 18 can be the same as the first vibration damping pad 1104. This can reduce the vibration and noise of the cooling fan 8 during operation and isolate the vibration of the cooling fan 8 from being transmitted to the fixed base 5.

[0040] Furthermore, in some embodiments, such as Figure 8 As shown, a silicone rod 17 is also used to fill the space between the low-voltage coil 16 and the iron core 1, or a rubber rod can be used in other embodiments. This reduces the horizontal vibration of the transformer and lowers the noise.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transformer, characterized in that, The transformer includes an outer casing and a transformer body located inside the casing. The low-voltage side of the transformer body is electrically connected to a lead-out bar via a flexible connector. The outer casing is equipped with a bracket for suspending the lead-out bar, which is located at the top of the casing and directly above the lead-out bar.

2. The transformer according to claim 1, characterized in that, The bracket includes a connecting rod with an external thread at its top, and the top of the connecting rod passes through the top of the outer shell. Locking nuts are connected to the connecting rod on both the inner and outer sides of the top of the shell to fix the connecting rod to the top of the shell.

3. The transformer according to claim 2, characterized in that, A pad is installed between the locking nut and the top of the housing, and a first damping pad is installed between the pad and the top of the housing.

4. The transformer according to claim 2, characterized in that, A first damping pad is installed between the locking nut and the top of the housing.

5. The transformer according to any one of claims 2-4, characterized in that, The bottom end of the connecting rod is provided with an external thread. The bottom end of the connecting rod is fitted with an insulating upper clamp and a lower clamp. The upper clamp and the lower clamp are respectively clamped at the upper and lower ends of the cable outlet. The bottom end of the connecting rod is also connected with clamping nuts located on the upper side of the upper clamp and the lower side of the lower clamp to clamp the cable outlet.

6. The transformer according to any one of claims 1-4, characterized in that, The transformer is a dry-type transformer, and a second vibration damping pad is provided between the pad block of the transformer body and the coil.

7. The transformer according to claim 6, characterized in that, The second damping pad has a protrusion, and the pad block has a concave portion. The protrusion is embedded into the concave portion to fix the second damping pad and the pad block.

8. The transformer according to any one of claims 1-4, characterized in that, The transformer is a dry-type transformer, and a vibration damper is connected between the lower clamp of the transformer body and the fixed base.

9. The transformer according to claim 8, characterized in that, A shim is provided between the shock absorber and the lower clamp to elevate the part above the lower clamp.

10. The transformer according to any one of claims 1-4, characterized in that, The transformer is a dry-type transformer. A cooling fan is installed on the fixed base of the transformer body, and a third vibration damping pad is installed between the cooling fan and the fixed base.

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