Transformer bushing mounting flange

Abstract

A transformer bushing mounting flange is configured to be fitted on a tubular transformer bushing, the inner diameter of the transformer bushing mounting flange being greater than the outer diameter of the transformer bushing so that a cavity is formed between the transformer bushing mounting flange and the transformer bushing, the transformer bushing mounting flange comprising: an annular recess configured to be recessed downward from the top surface of the transformer bushing mounting flange and to accommodate a sealing ring; an exhaust passage provided in the transformer bushing mounting flange and configured to communicate the cavity with the external environment; and a plug configured to be insertable into the outlet of the exhaust passage to sealingly close the outlet of the exhaust passage. The transformer bushing mounting flange of the present invention eliminates the risk of excessive electric field strength due to air that can exist in the cavity.

Description

Technical Field

[0001] This invention relates generally to the technical field of transformers, and more specifically to a transformer bushing mounting flange. Background Technology

[0002] Traditionally, a certain gap is required during the assembly of transformer bushings and their mounting flanges. This means that the inner diameter of the flange is typically slightly larger than the outer diameter of the bushing to facilitate assembly. However, after assembly, air may remain in the gap, which cannot be expelled. This results in a higher electric field strength at this point, potentially leading to partial discharge. Summary of the Invention

[0003] In view of this, in order to eliminate or mitigate the above problems, the present invention discloses a transformer bushing mounting flange. The transformer bushing mounting flange has an annular shape and includes an inner circumferential surface and an outer circumferential surface, as well as a flat top surface and a bottom surface opposite each other in the axial direction. The transformer bushing mounting flange is configured to be fitted onto a tubular transformer bushing. The inner diameter of the transformer bushing mounting flange is larger than the outer diameter of the transformer bushing. When the transformer bushing mounting flange is connected to the transformer bushing, the top surface of the transformer bushing mounting flange connects to the bottom surface of an annular protrusion that projects radially outward from the outer circumferential surface of the transformer bushing, thereby forming a cavity between the transformer bushing mounting flange and the transformer bushing. The transformer bushing mounting flange includes: an annular recess configured to recess downward from the top surface of the transformer bushing mounting flange, such that the top of the transformer bushing mounting flange has an inner annular protrusion and an outer annular protrusion, and the annular recess is configured to accommodate a sealing ring; an exhaust passage disposed in the transformer bushing mounting flange and configured to communicate the cavity with the external environment, the outlet of the exhaust passage being disposed on the outer peripheral surface of the transformer bushing mounting flange to allow air from the cavity to exit the exhaust passage; and a plug configured to be inserted into the outlet of the exhaust passage to seal the outlet of the exhaust passage.

[0004] Furthermore, the height of the top surface of the inner annular protrusion in the vertical direction is lower than the height of the top surface of the transformer bushing mounting flange, so that when the transformer bushing mounting flange is connected to the transformer bushing, there is a gap between the top surface of the annular protrusion and the annular protrusion of the transformer bushing.

[0005] Furthermore, the inlet of the exhaust passage is located on the top surface of the annular protrusion to allow air from the cavity to enter the exhaust passage.

[0006] Furthermore, the exhaust passage includes a first section extending in a vertical direction and a second section extending in a horizontal direction, the first section and the second section being interconnected.

[0007] Furthermore, one end of the first section is connected to the inlet, and one end of the second section is connected to the outlet.

[0008] Furthermore, the height of the top surface of the inner annular protrusion in the vertical direction is equal to the height of the top surface of the transformer bushing mounting flange.

[0009] Furthermore, the inlet of the exhaust passage is located on the inner circumferential surface of the transformer bushing mounting flange and adjacent to the top of the annular protrusion to allow air from the cavity to enter the exhaust passage.

[0010] Furthermore, multiple screw holes are provided on the top surface of the outer annular protrusion.

[0011] Furthermore, the plurality of screw holes are equidistant from each other in the circumferential direction.

[0012] The above arrangement eliminates the risk of excessively high electric field strength caused by air that may be present in the cavity. Attached Figure Description

[0013] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent to those skilled in the art. In the drawings:

[0014] Figure 1 This is a perspective view showing a transformer bushing mounting flange according to an embodiment of the present invention;

[0015] Figure 2 It shows Figure 1 The top view of the transformer bushing mounting flange shown;

[0016] Figure 3 It shows Figure 1 The diagram shows a side sectional view of the transformer bushing mounting flange, wherein the transformer bushing mounting flange is assembled with the transformer bushing; and

[0017] Figure 4 It shows Figure 3 The image shown is a perspective view of the transformer bushing mounting flange assembled with the transformer bushing.

[0018] The accompanying figure is labeled as follows:

[0019] 1 Transformer bushing mounting flange

[0020] 11 Inner circumferential surface

[0021] 12 Outer Peripheral Surface

[0022] 13 Top surface

[0023] 14 Bottom

[0024] 15. Annular recess

[0025] 16 Inner ring protrusions

[0026] 16' Outer ring protrusion

[0027] 17. Plug

[0028] 2 Transformer bushings

[0029] 21. Annular protrusions

[0030] 22 Through Holes

[0031] P Exhaust passage

[0032] P1 Entrance

[0033] P2 Exit

[0034] PA Section 1

[0035] PB Second Section

[0036] H screw hole

[0037] S gap

[0038] C cavity

[0039] O sealing ring

[0040] B bolt Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the following embodiments are provided to further illustrate the present invention in detail.

[0042] like Figures 1 to 4 As shown, the present invention provides a transformer bushing mounting flange 1. The transformer bushing mounting flange 1 has an annular shape and includes an inner circumferential surface 11 and an outer circumferential surface 12, as well as a flat top surface 13 and a bottom surface 14 facing each other in the axial direction. The transformer bushing mounting flange 1 is configured to be fitted onto a tubular transformer bushing 2, and the inner diameter of the transformer bushing mounting flange 1 is larger than the outer diameter of the transformer bushing 2. When the transformer bushing mounting flange 1 is connected to the transformer bushing 2, the top surface 13 of the transformer bushing mounting flange 1 connects to the bottom surface of an annular protrusion 21 that projects radially outward from the outer circumferential surface of the transformer bushing 2, thereby forming a cavity C between the transformer bushing mounting flange 1 and the transformer bushing 2.

[0043] When transformer bushing mounting flange 1 is assembled with transformer bushing 2 (e.g.) Figure 3 After that (as shown), its lower part will be immersed in transformer oil, and the transformer oil will enter the cavity C, but at this time there may be air in the cavity C that is difficult to be expelled.

[0044] Therefore, to expel any air that may be present, the transformer bushing mounting flange 1 is designed to also include an annular recess 15, an exhaust passage P, and a plug 17. The annular recess 15 is configured to recess downwards from the top surface 13 of the transformer bushing mounting flange 1, such that an inner annular protrusion 16 and an outer annular protrusion 16' are formed on the top of the transformer bushing mounting flange 1. The annular recess 15 is configured to accommodate a sealing ring O. The exhaust passage P is disposed in the transformer bushing mounting flange 1 and configured to communicate the cavity C with the external environment. The plug 17 is configured (particularly after the air in the cavity C has been expelled) to be inserted into the outlet P2 of the exhaust passage P to seal the outlet P2 of the exhaust passage P.

[0045] Accordingly, with this arrangement, the transformer oil entering the cavity C can travel further along the exhaust channel P, thereby expelling any air that may be present in the cavity C to the external environment via the exhaust channel P, and after the air is expelled (for example, when the transformer oil flows out from the outlet P2 of the exhaust channel P), the exhaust channel P is sealed with plug 17.

[0046] exist Figure 3 In the illustrated embodiment, the height of the top surface of the inner annular protrusion 16 in the vertical direction can be lower than (particularly lower, slightly lower than) the height of the top surface 13 of the transformer bushing mounting flange 1, such that when the transformer bushing mounting flange 1 is connected to the transformer bushing 2, there is a gap S between the top surface of the annular protrusion 16 and the annular protrusion 21 of the transformer bushing 2. In this case, the inlet P1 of the exhaust channel P can be located on the top surface of the annular protrusion 16 to allow air from the cavity C to enter the exhaust channel P, and the outlet P2 of the exhaust channel P can be located on the outer peripheral surface 12 of the transformer bushing mounting flange 1 to allow air from the cavity C to exit the exhaust channel P.

[0047] Furthermore, in an embodiment not shown, the height of the top surface of the inner annular protrusion 16 in the vertical direction can be equal to the height of the top surface 13 of the transformer bushing mounting method 1, that is, there is no gap S. In this case, the inlet P1 of the exhaust channel P can be located on the inner circumferential surface 11 of the transformer bushing mounting flange 1 and adjacent to the top of the annular protrusion 16 to allow air from the cavity C to enter the exhaust channel P, and the outlet P2 of the exhaust channel P can be located on the outer circumferential surface 12 of the transformer bushing mounting flange 1 to allow air from the cavity C to exit the exhaust channel P.

[0048] In this invention, the specific configuration of the exhaust channel P is not particularly limited, as long as it is located in the transformer bushing mounting flange 1 and can exhaust any air that may be present in the cavity C. Preferably, in Figure 3 In the embodiment shown, the exhaust passage P may include a first section PA extending in a vertical direction and a second section PB extending in a horizontal direction, the first section PA and the second section PB being connected to each other.

[0049] Specifically, one end of the first segment PA is connected to the inlet P1, and one end of the second segment PB is connected to the outlet P2. Of course, at this time, the other end of the first segment PA and the other end of the second segment PB are connected to each other.

[0050] like Figure 1 , Figure 2 and Figure 4 As shown, multiple screw holes H can be provided on the top surface of the outer annular protrusion 16', and multiple through holes 22 corresponding to the aforementioned multiple screw holes H are formed in the annular protrusion 21 of the transformer bushing 2, so that each of the multiple screw holes H is aligned with the corresponding through hole 22 and inserted by, for example, the corresponding bolt B, thereby realizing the connection between the transformer bushing mounting flange 1 and the transformer bushing 2.

[0051] like Figure 2 As shown, multiple screw holes H can be equidistant from each other in the circumferential direction. In other words, multiple screw holes H are arranged on the circumference of an imaginary circle concentric with the transformer bushing mounting flange 1.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 bushing mounting flange (1) having an annular shape and including an inner circumferential surface (11) and an outer circumferential surface (12), and flat top surface (13) and bottom surface (14) opposite each other in the axial direction, the transformer bushing mounting flange (1) being configured to be fitted onto a tubular transformer bushing (2), the inner diameter of the transformer bushing mounting flange (1) being larger than the outer diameter of the transformer bushing (2), and when the transformer bushing mounting flange (1) is connected to the transformer bushing (2), the top surface (13) of the transformer bushing mounting flange (1) is connected to the bottom surface of an annular protrusion (21) projecting radially outward from the outer circumferential surface of the transformer bushing (2), such that a cavity (C) is formed between the transformer bushing mounting flange (1) and the transformer bushing (2), characterized in that, The transformer bushing mounting flange (1) includes: An annular recess (15) is configured to be recessed downward from the top surface (13) of the transformer bushing mounting flange (1), such that an inner annular protrusion (16) and an outer annular protrusion (16') are formed on the top of the transformer bushing mounting flange (1), and the annular recess (15) is configured to accommodate a sealing ring (O). An exhaust passage (P) is disposed in the transformer bushing mounting flange (1) and configured to communicate the cavity (C) with the external environment. An outlet (P2) of the exhaust passage (P) is disposed on the outer peripheral surface (12) of the transformer bushing mounting flange (1) to allow air from the cavity (C) to exit the exhaust passage (P). A plug (17) is configured to be inserted into the outlet (P2) of the exhaust passage (P) to seal the outlet (P2) of the exhaust passage (P).

2. The transformer bushing mounting flange according to claim 1, characterized in that, The height of the top surface of the inner annular protrusion (16) in the vertical direction is lower than the height of the top surface (13) of the transformer bushing mounting flange (1), so that when the transformer bushing mounting flange (1) is connected to the transformer bushing (2), there is a gap (S) between the top surface of the annular protrusion (16) and the annular protrusion (21) of the transformer bushing (2).

3. The transformer bushing mounting flange according to claim 2, characterized in that, The inlet (P1) of the exhaust passage (P) is located on the top surface of the annular protrusion (16) to allow air from the cavity (C) to enter the exhaust passage (P).

4. The transformer bushing mounting flange according to claim 3, characterized in that, The exhaust passage (P) includes a first section (PA) extending vertically and a second section (PB) extending horizontally, the first section (PA) and the second section (PB) being interconnected.

5. The transformer bushing mounting flange according to claim 4, characterized in that, One end of the first section (PA) is connected to the inlet (P1), and one end of the second section (PB) is connected to the outlet (P2).

6. The transformer bushing mounting flange according to claim 1, characterized in that, The height of the top surface of the inner annular protrusion (16) in the vertical direction is equal to the height of the top surface (13) of the transformer bushing mounting flange (1).

7. The transformer bushing mounting flange according to claim 6, characterized in that, The inlet (P1) of the exhaust passage (P) is located on the inner circumferential surface (11) of the transformer bushing mounting flange (1) and adjacent to the top of the annular protrusion (16) to allow air from the cavity (C) to enter the exhaust passage (P).

8. The transformer bushing mounting flange according to claim 1 or 2, characterized in that, Multiple screw holes (H) are provided on the top surface of the outer annular protrusion (16').

9. The transformer bushing mounting flange according to claim 8, characterized in that, The plurality of screw holes (H) are equidistant from each other in the circumferential direction.

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