Wire outlet end assembly for power transformer and power transformer

Abstract

The utility model relates to a leading-out terminal assembly for a power transformer and the power transformer. The outlet terminal assembly includes: an outgoing line led out from one end of a cylindrical winding of the power transformer, the outgoing line including a first lead section and a second lead section, the winding defining an axial direction, a radial direction and a circumferential direction, the first lead section and the second lead section being connected to each other and arranged at an angle to each other; the insulation angle ring comprises an angle ring base part and an angle ring protruding part connected with the angle ring base part, the angle ring base part is suitable for being installed at the end part of the winding, and the angle ring protruding part extends away from the winding in the axial direction from the angle ring base part and extends outwards in the radial direction to protrude out of the angle ring base part. Therefore, a containing space for the first lead section and the second lead section to pass through is formed in a corner area defined by the angle ring base part and the angle ring protruding part. According to the leading-out terminal assembly, the insulation angle ring is utilized to ensure an enough safe distance, and the occupied space is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power engineering, specifically to an output terminal assembly for a power transformer and a power transformer. Background Technology

[0002] When the voltage level of a power transformer is high, a large space must be left between the outgoing terminal and the surrounding iron parts to ensure a sufficient safety distance and prevent discharge.

[0003] In the prior art, the following solution is usually adopted to solve the above problems: a safety distance is ensured by wrapping multiple layers of insulation on the copper wire at the output end. However, this output end still requires a large safety distance, occupies a lot of space, and affects heat dissipation, which can easily cause local overheating of the transformer. Utility Model Content

[0004] The present invention aims to provide an output terminal assembly for a power transformer and a power transformer, wherein the output terminal assembly can ensure sufficient safety distance, reduce the space occupied, and ensure heat dissipation.

[0005] According to one aspect of this application, an output terminal assembly for a power transformer is provided. Specifically, the output terminal assembly includes: a lead wire extending from one end of a cylindrical winding of the power transformer, the lead wire including a first lead section and a second lead section, the first lead section and the second lead section being interconnected and arranged at an angle to each other, the winding defining an axial direction, a radial direction, and a circumferential direction; and an insulating corner ring including a corner ring base and a corner ring protrusion connected to the corner ring base, wherein the shape of the corner ring base is adapted to be mounted to the end of the winding, and the corner ring protrusion extends from the corner ring base away from the winding in the axial direction and extends outward in the radial direction to protrude beyond the corner ring base, thereby forming a receiving space for the passage of the first lead section and the second lead section in a corner region enclosed by the corner ring base and the corner ring protrusion.

[0006] In this way, the outgoing terminal assembly of this utility model uses insulating corner rings to reduce the local electric field strength, ensure the insulation distance, thereby reducing the space occupied, and at the same time, the heat dissipation effect is good.

[0007] In one exemplary embodiment, the corner ring base includes an interconnected base radial portion and a base axial portion, wherein the base radial portion is shaped as a sheet extending in the radial direction and the circumferential direction and is positioned to face the end face of the end of the winding; and wherein the base axial portion is shaped as a sheet extending in the axial direction and the circumferential direction and is positioned to face the inner circumferential surface of the end of the winding.

[0008] In this way, the insulating corner ring is more securely fixed to the end of the winding, while this structural design helps to reduce space occupation and improve heat dissipation efficiency.

[0009] In one exemplary embodiment, the corner ring protrusion is formed from the middle region of the corner ring base, whereby the radial portion of the base includes two flaps that are respectively connected to both sides of the corner ring protrusion in the circumferential direction.

[0010] In this way, while ensuring the smooth passage of the lead wire, the structure of the insulating corner ring can be further optimized, the insulation distance can be ensured, the local field strength can be reduced, and the setting of the two fins can help the insulating corner ring better adapt to the circumferential direction of the winding, enhance the stability of the overall structure, and at the same time help to form a more effective heat dissipation channel.

[0011] In one exemplary embodiment, the first lead segment extends along the axial direction and the second lead segment extends along the radial direction, such that the first lead segment and the second lead segment are perpendicular to each other.

[0012] In this way, not only is the space occupied by the leads inside the transformer reduced, but the insulation distance between the leads and the surrounding iron parts is also ensured, thus improving the heat dissipation effect.

[0013] In one exemplary embodiment, the corner ring protrusion includes: a first sidewall and a second sidewall, both extending from the radial portion of the base of the corner ring base and arranged opposite to each other; a planar first connecting wall connecting the first sidewall and the second sidewall; and a curved second connecting wall connecting the first sidewall and the second sidewall; wherein one side of the second connecting wall is connected to the first connecting wall, and the other side of the second connecting wall opposite to the one side is connected to the axial portion of the base of the corner ring base.

[0014] In this way, the path of the first lead section and the second lead section is optimized, the heat dissipation area is increased, and the heat dissipation effect is improved.

[0015] In one exemplary embodiment, the first sidewall and the second sidewall extend outward in the radial direction from the radial portion of the base of the corner ring, such that the outer edges of the first sidewall and the outer edges of the second sidewall are aligned with the outer circumference of the winding.

[0016] In this way, the radial extension design of the first and second sidewalls aligns their outer edges with the outer circumference of the winding. This not only helps to form a more uniform insulation distance and reduce the local field strength, but also allows the structure to make better use of the space outside the winding, forming an effective heat dissipation channel and improving heat dissipation efficiency.

[0017] In one exemplary embodiment, a gap is provided between the radial portion of the base and the end of the winding to form a first oil passage for cooling oil to pass through.

[0018] In this way, the first oil channel provides a flow path for the cooling oil, improving heat dissipation and reducing the risk of localized overheating of the transformer.

[0019] In one exemplary embodiment, a gap is provided between the first lead section and the first sidewall, the second sidewall and the second connecting wall to form a second oil passage for cooling oil to pass through; a gap is provided between the second lead section and the first sidewall, the second sidewall and the first connecting wall to form a third oil passage for cooling oil to pass through; the second oil passage communicates with the third oil passage.

[0020] In this way, the second and third oil channels not only increase the flow path of the cooling oil and improve heat dissipation efficiency, but their interconnected design also ensures that the cooling oil is evenly distributed, improves the overall heat dissipation effect, reduces space occupation, and reduces the risk of local overheating of the transformer.

[0021] In one exemplary embodiment, the insulating corner ring is composed of one or more insulating layers.

[0022] In this way, the insulation performance of the insulating corner ring can be adjusted according to specific needs, which can not only meet the insulation distance requirements under high voltage levels, but also flexibly adapt to transformers of different specifications. At the same time, the multi-layer insulation structure can further reduce the local field strength, optimize heat dissipation, and reduce space occupation.

[0023] According to another aspect of this application, a power transformer is also provided, the power transformer including the output terminal assembly for a power transformer as described in any of the exemplary embodiments above.

[0024] In summary, the present invention provides a power transformer output terminal assembly and a power transformer, which can achieve at least the following beneficial technical effects.

[0025] First, the outgoing terminal assembly of this utility model for power transformers reduces local electric field strength, ensures safe insulation distance, and reduces the space occupied.

[0026] Secondly, the oil channel isolation of the output terminal assembly of the power transformer in this utility model ensures good heat dissipation. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a perspective view of an output terminal assembly for a power transformer and related cylindrical windings according to an exemplary embodiment of the present invention.

[0029] Figure 2 This is a perspective view of an outgoing terminal assembly for a power transformer according to an exemplary embodiment of the present invention.

[0030] Figure 3 This is another perspective view of an output terminal assembly for a power transformer according to an exemplary embodiment of the present invention.

[0031] Figure 4 This is a perspective view of an insulating corner ring for an output terminal assembly of a power transformer according to an exemplary embodiment of the present invention.

[0032] Figure 5 This is another perspective view of an insulating corner ring for an output terminal assembly of a power transformer according to an exemplary embodiment of the present invention.

[0033] The accompanying figure is labeled as follows:

[0034] 10. Insulating corner rings

[0035] 11. Corner ring base

[0036] 12. Axial portion of the base

[0037] 13. Radial portion of the base

[0038] 14. Wing

[0039] 20. Corner ring protrusion

[0040] 21. First sidewall

[0041] 22. Second sidewall

[0042] 23. First connecting wall

[0043] 24. Second connecting wall

[0044] 25. Outer edge

[0045] 30. Lead wire

[0046] 31. First lead section

[0047] 32. Second lead section

[0048] 40. Winding

[0049] 41. End

[0050] 51. First oil passage

[0051] 52. Second oil passage

[0052] 53. Third oil passage Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate the utility model in detail. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model. The nouns and pronouns referring to persons in this patent application are not limited to specific genders.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0055] First, refer to Figure 1 The diagram illustrates a terminal assembly for a power transformer and a cylindrical winding 40. It should be noted that the radial, circumferential, and axial directions mentioned in this application are defined relative to the cylindrical winding 40, and their meanings will be clearly understood by those skilled in the art. The terminal assembly mainly includes leads 30 and insulating corner rings 10.

[0056] Simultaneously refer to Figure 1 and Figure 2Lead 30 extends from one end 41 of the cylindrical winding 40 of the power transformer. Lead 30 includes a first lead section 31 and a second lead section 32, which are connected to each other and arranged at an angle to each other. Specifically, the first lead section 31 may extend axially, and the second lead section 32 may extend radially, thereby making the first lead section 31 and the second lead section 32 substantially perpendicular to each other. Of course, the first lead section 31 and the second lead section 32 may also form other suitable angles, such as angles in the range of 80 degrees to 100 degrees.

[0057] Simultaneously refer to Figure 1 and Figure 2 The insulating corner ring 10 includes a corner ring base 11 and a corner ring protrusion 20 connected to the corner ring base 11. The corner ring base 11 is shaped to be mounted to the end 41 of the winding 40. The corner ring protrusion 20 extends axially away from the winding 40 from the corner ring base 11 and extends radially outward to protrude from the corner ring base, thereby forming a receiving space in the corner region enclosed by the corner ring base 11 and the corner ring protrusion 20 for the passage of the first lead section 31 and the second lead section 32.

[0058] It should be noted that even when the first lead section 31 and the second lead section 32 are housed in the housing space, the housing space can still have channels that allow cooling oil to pass through, so as to improve the heat dissipation effect.

[0059] Reference Figure 4 As can be seen, the corner ring base 11 includes a radial base portion 13 and an axial base portion 12 that are interconnected. (See also...) Figure 1 and Figure 4 As can be seen, the base radial portion 13 is shaped as a sheet extending in both the radial and circumferential directions of the winding 40, and is positioned facing the end face of the end 41 of the winding 40. Specifically, a gap may be present between the base radial portion 13 and the end face of the end 41 of the winding 40 to form a first oil passage 51 for cooling oil. The base axial portion 12 is shaped as a sheet extending in both the axial and circumferential directions, and is positioned facing the inner circumferential surface of the end 41 of the winding 40. From... Figure 3 It can also be seen that an appropriate chamfer can be formed in the area where the radial portion 13 and the axial portion 12 of the base meet.

[0060] Reference Figure 2The corner ring protrusion 20 is formed protruding from the middle region of the corner ring base 11, whereby the radial portion 13 of the base includes two flaps 14 that respectively connect to both sides of the corner ring protrusion 20 in the circumferential direction. It is understood that the radial extension of the two flaps 14 can be appropriately varied. In this embodiment, the two flaps 14 are arranged substantially symmetrically with respect to the corner ring protrusion 20, having substantially the same circumferential length and curvature. Furthermore, appropriate chamfers can be formed in the portions where the two flaps 14 connect to both sides of the corner ring protrusion 20. Figure 2 It can also be seen that the two free ends of the corner ring base 11 have bevels to facilitate processing and assembly.

[0061] Reference Figure 4 The corner ring protrusion 20 may include: a first sidewall 21 and a second sidewall 22, both extending from the radial portion 13 of the base of the corner ring base 11 and arranged opposite to each other; a planar first connecting wall 23 connecting the first sidewall 21 and the second sidewall 22; and a curved second connecting wall 24 connecting the first sidewall 21 and the second sidewall 22. One side of the second connecting wall 24 is connected to the first connecting wall 23, and the other side of the second connecting wall 24 opposite to the first side is connected to the axial portion 12 of the base of the corner ring base 11.

[0062] Reference Figure 1 It can be seen that the first sidewall 21 and the second sidewall 22 extend outward in the radial direction from the base radial portion 13 of the corner ring base 11, so that the outer edge 25 of the first sidewall 21 and the outer edge of the second sidewall 22 are aligned with the outer circumference of the winding 40.

[0063] Reference Figure 3 As can be seen, gaps are provided between the first lead section 31 and the first sidewall 21, the second sidewall 22, and the second connecting wall 24 to form a second oil passage 52 for cooling oil to pass through; gaps are provided between the second lead section 32 and the first sidewall 21, the second sidewall 22, and the first connecting wall 23 to form a third oil passage 53 for cooling oil to pass through; the second oil passage 52 and the third oil passage 53 are connected. Of course, the first oil passage 51 is also connected to the second oil passage 52 and the third oil passage 53 to achieve the best cooling effect.

[0064] Depending on the type of transformer and its application, the insulating corner ring 10 can be composed of one or more insulating layers. It should be noted that the dimensions of each component of the corner ring protrusion of this invention can be appropriately designed as needed. For example, the corner ring base 11 can extend at an angle of approximately 30 degrees along the circumferential direction of the winding, while the corner ring protrusion 20 can extend at an angle of approximately 15 degrees along the circumferential direction of the winding 40.

[0065] This utility model also provides a power transformer, specifically, the power transformer includes the output terminal assembly as described above. In summary, the power transformer of this utility model adds a specially designed insulating corner ring at the output terminal to isolate the oil passage, reduce local electric field strength, ensure insulation distance, reduce space occupation, and simultaneously ensure good heat dissipation.

[0066] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An outlet terminal assembly for an electrical power transformer, characterized by The outlet end assembly comprises: a lead-out wire (30) leading out from one end (41) of a cylindrical winding (40) of a power transformer, the lead-out wire (30) comprising a first lead section (31) and a second lead section (32), the first lead section (31) and the second lead section (32) being connected to each other and being angularly arranged to each other, the winding (40) defining an axial direction, a radial direction and a circumferential direction; and an insulating corner ring (10) comprising a corner ring base (11) and a corner ring protrusion (20) connected to the corner ring base (11), wherein the corner ring base (11) is shaped to be mounted to the end (41) of the winding (40), the corner ring protrusion (20) extends from the corner ring base (11) away from the winding (40) in the axial direction and outward in the radial direction to protrude from the corner ring base, so as to form an accommodation space for the first lead section (31) and the second lead section (32) to pass through in a corner region enclosed by the corner ring base (11) and the corner ring protrusion (20).

2. The outlet end assembly for a power transformer according to claim 1, wherein the corner ring base (11) comprises a base radial portion (13) and a base axial portion (12) connected to each other, wherein the base radial portion (13) is shaped as a sheet extending in the radial direction and the circumferential direction and positioned to face an end face of the end (41) of the winding (40); and wherein the base axial portion (12) is shaped as a sheet extending in the axial direction and the circumferential direction and positioned to face an inner circumferential surface of the end (41) of the winding (40).

3. The outlet terminal assembly for a power transformer of claim 2, wherein, the corner ring protrusion (20) is formed protrusively from a middle region of the corner ring base (11), whereby the base radial portion (13) comprises two flaps (14) respectively interfacing two sides of the corner ring protrusion (20) in the circumferential direction.

4. The outlet terminal assembly for a power transformer of any one of claims 1 to 3, characterized in that, the first lead section (31) extends in the axial direction and the second lead section (32) extends in the radial direction, whereby the first lead section (31) and the second lead section (32) are perpendicular to each other.

5. The outlet terminal assembly for a power transformer of claim 3, wherein, the corner ring protrusion (20) comprises: a first side wall (21) and a second side wall (22) both extending from the base radial portion (13) of the corner ring base (11) and being oppositely arranged to each other; a planar first connecting wall (23) connected between the first side wall (21) and the second side wall (22); a curved second connecting wall (24) connected between the first side wall (21) and the second side wall (22); One side of the second connecting wall (24) is connected with the first connecting wall (23), and the other side of the second connecting wall (24) opposite to the one side is connected with the base axial portion (12) of the base of the corner ring (11).

6. The terminal assembly for power transformer according to claim 5, wherein, The first side wall (21) and the second side wall (22) extend outwardly from the base radial portion (13) of the base of the corner ring (11) in the radial direction by a distance such that the outer edge (25) of the first side wall (21) and the outer edge of the second side wall (22) are aligned with the outer circumference of the winding (40).

7. The outlet assembly for a power transformer of claim 5, wherein, The base radial portion (13) and the end portion (41) of the winding (40) have a gap therebetween to form a first oil passage (51) for cooling oil to pass through.

8. The outlet assembly for a power transformer according to any one of claims 5 to 7, characterized in that, The first lead section (31) is configured with a gap between the first side wall (21), the second side wall (22) and the second connecting wall (24) to form a second oil passage (52) for cooling oil to pass through; The second lead section (32) is configured with a gap between the first side wall (21), the second side wall (22) and the first connecting wall (23) to form a third oil passage (53) for cooling oil to pass through; The second oil passage (52) is communicated with the third oil passage (53).

9. The outlet terminal assembly for a power transformer of any one of claims 1 to 3, wherein, The insulating corner ring (10) is composed of one insulating layer or multiple insulating layers.

10. An electrical transformer, characterized by The power transformer comprises the terminal assembly for power transformer according to any one of claims 1 to 9.

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