Oil-immersed power transformer and substation

Abstract

The present application relates to an oil-immersed power transformer and a transformer substation, and relates to the technical field of transformers, which comprises a transformer body and a plurality of conductive rods fixedly mounted on the transformer body; an insulating sleeve is sleeved on the outer circumference of the conductive rod, and the outer diameter of the insulating sleeve decreases in a direction away from the transformer body, and a fixing assembly for fixing the insulating sleeve is provided on the transformer body; due to the installation setting of the insulating sleeve, the present application uses a fixing assembly to fix the insulating sleeve on the outer circumference of the conductive rod, and the outer circumferential surface of the insulating sleeve is a smooth surface (the outer diameter is set to decrease), thereby reducing the volume of the connection structure on the high-voltage side of the oil-immersed transformer and meeting the use requirements of a compact transformer substation.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to an oil-immersed power transformer and a substation. Background Art

[0002] With the rapid advancement of urbanization and the continuous growth of electricity demand, urban space resources have become increasingly scarce. Traditional substations are difficult to meet the development needs of modern cities due to their large footprint and long construction period. For this reason, compact substations have emerged. Their compact structure, small footprint and comprehensive functions make them the preferred solution in urban power grid construction.

[0003] Compact substation, i.e. prefabricated or box-type substation, integrates multiple electrical components such as oil-immersed transformer, high-voltage circuit breaker, disconnector, grounding switch, current transformer, voltage transformer, etc. into one box through reasonable internal design and layout. This design not only improves the utilization of space, but also reduces construction cost and maintenance difficulty.

[0004] The connection structure on the high-voltage side of the oil-immersed power transformer mainly includes a high-voltage bushing and related insulating support components, wherein the high-voltage bushing is usually composed of a conductive rod, a porcelain sleeve, insulating oil and a capacitor core, wherein a plurality of shed structures are formed on the outer periphery of the porcelain sleeve, similar to the shape of the high-voltage insulating bushing in the invention application with publication number CN114628113A.

[0005] However, compact substations have high space requirements. Although the multiple umbrella skirt structures formed on the outer periphery of the porcelain bushing improve the insulation performance, they also increase the overall volume. As a result, the high-voltage bushing structure on the high-voltage side of the above-mentioned oil-immersed power transformer occupies a large space, which further increases the overall volume of the compact substation and cannot meet the use requirements of the compact substation. There is room for improvement. Summary of the invention

[0006] The purpose of the present application is to provide an oil-immersed power transformer and a substation to solve the problem that the high-voltage bushing structure on the above-mentioned oil-immersed power transformer occupies a large space and cannot meet the use requirements of a compact substation.

[0007] In the first aspect, the present application provides an oil-immersed power transformer adopting the following technical solution:

[0008] An oil-immersed power transformer comprises a transformer body and a plurality of conductive rods fixed on the transformer body; an insulating sleeve is sleeved on the outer circumference of the conductive rod, the outer diameter of the insulating sleeve decreases in a direction away from the transformer body, and a fixing assembly for fixing the insulating sleeve is provided on the transformer body.

[0009] By adopting the above technical solution, due to the installation setting of the insulating sleeve, the insulating sleeve is fixed to the outer periphery of the conductive rod using a fixing assembly, and the outer peripheral surface of the insulating sleeve is a smooth surface (the outer diameter size is set in decreasing order), thereby reducing the volume of the connection structure on the high-voltage side of the oil-immersed transformer and meeting the use requirements of a compact substation.

[0010] Optionally, the fixing assembly includes a plurality of positioning screws fixed on the transformer body, positioning nuts threadedly mounted on the outer circumference of the positioning screws, and a positioning ring mounted on the outside of the insulating sleeve, the positioning ring being provided with positioning through holes for the positioning screws to pass through; a retaining ring located below the positioning ring is fixed on the outer circumference of the end of the insulating sleeve facing the transformer body.

[0011] By adopting the above-mentioned technical scheme, due to the coordinated arrangement of the positioning screw, the positioning nut and the positioning ring, when using the positioning ring to fix the insulating sleeve, the positioning ring is first sleeved on the outer periphery of the insulating sleeve, and at the same time, the positioning screw is passed through the corresponding positioning through hole until the lower side surface of the positioning ring abuts against the upper side surface of the retaining ring, and finally the positioning nut is screwed onto the outer periphery of the positioning screw, and then the positioning ring is fixed to achieve the installation and fixation of the insulating sleeve.

[0012] Optionally, a plurality of heat pipes are provided above the transformer body, and a positioning notch is provided on the inner wall of the positioning ring facing the insulating sleeve for inserting and fixing one end of the heating pipe. The end of the heat pipe away from the positioning ring is located above the positioning ring and is bent and fixed in a direction away from the outer periphery of the insulating sleeve.

[0013] By adopting the above technical solution, due to the installation setting of the heat pipe, one end of the heat pipe is installed at a position close to the insulating sleeve, and the other end is installed at a position far away from the insulating sleeve, so as to conduct the heat generated by the conductive rod to the area far away from the insulating sleeve, thereby improving the overall heat dissipation effect of the oil-immersed transformer.

[0014] Optionally, a fixing plate is provided on the side of the positioning ring facing the transformer body, a fixing slot for inserting the outer periphery of the heating pipe is opened on the fixing plate, and an elastic pad is provided on the inner wall of the fixing slot.

[0015] By adopting the above technical solution, due to the installation setting of the fixed clamping plate, the fixed clamping groove on the fixed clamping plate can be used to further limit and fix the end of the heat pipe close to the insulating sleeve, thereby improving the installation stability of the heat pipe.

[0016] Optionally, the positioning ring is provided with an installation groove for inserting a fixed card plate, and the side of the fixed card plate away from the fixed card plate is hinged to the inner wall of the installation groove through a hinge shaft, and the hinge shaft is sleeved with a reset member for driving the fixed card plate to rotate toward the insulating sleeve.

[0017] By adopting the above technical solution, due to the setting of the reset member, when the fixed clamping plate rotates in the direction close to the insulating sleeve under the action of the reset member, the inner wall of the fixed clamping groove on the fixed clamping plate is pressed against the outer peripheral surface of the heat pipe, further improving the installation stability of the heat pipe.

[0018] Optionally, a locking piece is provided on the transformer body, and the locking piece includes a first bending portion and a second bending portion that are perpendicular to each other and fixedly connected; the first bending portion is fixed on the transformer body, and a first clearance slot for the first bending portion to be inserted is provided on the side of the retaining ring facing the transformer body, and a second clearance slot for the second bending portion to be inserted is provided on the outer periphery of the retaining ring.

[0019] By adopting the above technical solution, due to the installation arrangement of the locking piece, after the insulating sleeve is installed, the first bent portion and the second bent portion are inserted into the corresponding first clearance slot and the second clearance slot, thereby further improving the installation stability of the insulating sleeve.

[0020] Optionally, the positioning ring is provided with a limit plate for limiting the rotation of the fixed clamping plate, and the limit plate is fixed with a limit protrusion located between the fixed clamping plate and the positioning ring; the second bending portion is provided with a limit slot for the fixed clamping plate to be inserted toward the edge of the retaining ring.

[0021] By adopting the above technical solution, due to the corresponding settings of the limit plate and the limit slot, the rotation range of the fixed block is limited first. When the positioning ring is installed, the edge of the fixed card plate is convenient for abutting the outer side surface of the second bending part, and at the same time, the fixed card plate is inserted into the interior of the limit slot toward the edge of the retaining ring, thereby further improving the installation stability of the second bending part.

[0022] Optionally, edges of both the first bent portion and the second bent portion facing the retaining ring are chamfered surfaces.

[0023] By adopting the above technical solution, it is convenient to insert the first bent portion and the second bent portion into the corresponding first make way slot and the second make way slot.

[0024] Optionally, a positioning protrusion is fixedly provided on the side of the first bending portion away from the transformer body, and a positioning groove for the positioning protrusion to be placed is formed on the inner wall of the first clearance slot.

[0025] By adopting the above technical solution, due to the matching setting of the positioning protrusion and the positioning groove, when the insulating sleeve is installed, the positioning protrusion on the first bent part is inserted into the positioning slot on the inner wall of the first yielding slot, thereby further improving the installation stability of the first bent part in the first yielding slot.

[0026] In the second aspect, a substation provided by the present application adopts the following technical solution:

[0027] A transformer substation comprises a box body, a box door arranged on the box body and any one of the above-mentioned oil-immersed power transformers.

[0028] By adopting the above technical solution, the volume of the connection structure on the high-voltage side of the oil-immersed transformer is reduced, so that the overall volume of the oil-immersed transformer is reduced, thereby making the volume of the compact substation accommodating the oil-immersed power transformer meet the usage requirements.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. Due to the installation setting of the insulating sleeve, the insulating sleeve is fixed to the outer periphery of the conductive rod using a fixing assembly, and the outer peripheral surface of the insulating sleeve is a smooth surface (the outer diameter size is set in decreasing order), thereby reducing the volume of the connection structure on the high-voltage side of the oil-immersed transformer and meeting the use requirements of the compact substation.

[0031] 2. According to the actual application situation, the staff can not only further fix and limit the heat pipe by fixing the clamping plate, but also abut and lock the outside of the second bending part by fixing the clamping plate to improve the installation stability of the insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application;

[0034] Figure 2 It is a schematic diagram of the exploded structure of the installation distribution of the fixed components embodied in Example 1 of the present application;

[0035] Figure 3 It is a partial cross-sectional structural schematic diagram of the installation and matching of the fixing assembly embodied in the first embodiment of the present application;

[0036] Figure 4 This is a structural diagram of the installation coordination of the box body and the box door in Example 1 of the present application;

[0037] Figure 5 This is a partial structural diagram of the heat pipe installation and coordination in Example 2 of the present application;

[0038] Figure 6 This is a schematic diagram of the exploded structure of the installation distribution of the heat pipe and the locking member in Example 2 of the present application;

[0039] Figure 7 It is a partial cross-sectional structural schematic diagram of the installation and cooperation of the locking member in Example 2 of the present application;

[0040] Figure 8 yes Figure 7 A magnified schematic diagram of part A;

[0041] Fig. 9 It is a partial cross-sectional structural schematic diagram of the installation cooperation of the fixed card plate embodied in the second embodiment of the present application;

[0042] Fig.10 yes Fig. 9 A magnified schematic diagram of part B;

[0043] Fig.11 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the limit plate in Example 2 of the present application;

[0044] Fig.12 It is a partial cross-sectional structural schematic diagram of embodiment 2 of the present application showing the installation cooperation between the fixed clamping plate and the upper limit clamping groove of the second bending part.

[0045] In the figure, 1, transformer body; 11, conductive rod; 2, insulating sleeve; 21, retaining ring; 211, first make way slot; 2111, positioning groove; 212, second make way slot; 3, fixing assembly; 31, positioning screw; 32, positioning nut; 33, positioning ring; 331, positioning through hole; 332, positioning notch; 333, clamp; 334, mounting slot; 335, fixing slot; 4, box body; 5, box door; 6, heat pipe; 7, locking member; 71, first bending part; 711, positioning protrusion; 72, second bending part; 721, limiting slot; 8, fixing card plate; 81, fixing slot; 82, reset member; 821, torsion spring; 83, hinge shaft; 84, elastic pad; 9, limiting plate; 91, limiting protrusion; 92, fixing block. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0047] Embodiment 1:

[0048] Reference Figure 1 and Figure 2 An oil-immersed power transformer comprises a transformer body 1 and three conductive rods 11 fixedly mounted on the high-voltage side of the transformer body 1; and an insulating sleeve 2 is sleeved on the outer circumference of the three conductive rods 11, the insulating sleeve 2 is made of epoxy resin, and the outer diameter of the insulating sleeve 2 decreases in a direction away from the transformer body 1, and a fixing component 3 for fixing the insulating sleeve 2 is provided on the transformer body 1.

[0049] Reference Figure 2 and Figure 3 The fixing assembly 3 includes three positioning screws 31 fixed on the transformer body 1, positioning nuts 32 threadedly sleeved on the outer periphery of the positioning screws 31, and a positioning ring 33 sleeved on the outside of the insulating sleeve 2. The three positioning screws 31 are evenly distributed on the outside of the conductive rod 11; a retaining ring 21 located below the positioning ring 33 is formed on the outer periphery of the end of the insulating sleeve 2 facing the transformer body 1, and three positioning through holes 331 are opened on the positioning ring 33 for the positioning screws 31 to pass through;

[0050] When using the positioning ring 33 to fix the insulating sleeve 2, first put the positioning ring 33 on the outer periphery of the insulating sleeve 2, and at the same time make the positioning screw 31 pass through the corresponding positioning through hole 331 until the lower side of the positioning ring 33 abuts against the upper side of the retaining ring 21, and finally screw the positioning nut 32 on the outer periphery of the positioning screw 31 to fix the positioning ring 33.

[0051] Reference Figure 4 A substation includes a box body 4, a box door 5 arranged on the box body 4 and the above-mentioned oil-immersed power transformer, wherein one side of the box door 5 is hinged to the box body 4, and the other side of the box door 5 is detachably connected to the box body 4 through a conventional lock structure.

[0052] The implementation principle of the embodiment of the present application is:

[0053] Due to the installation arrangement of the insulating sleeve 2 and the fixing assembly 3, the volume of the connection structure on the high-voltage side of the oil-immersed transformer is reduced, meeting the use requirements of a compact substation.

[0054] Embodiment 2:

[0055] Reference Figure 5 and Figure 6 The difference between the embodiment of the present application and embodiment 1 is that three heat pipes 6 are provided above the transformer body 1, the interior of the heat pipe 6 is evacuated into a negative pressure state and filled with a suitable liquid, which has a low boiling point and is easy to volatilize; it is mainly based on the rapid conduction of heat through the evaporation and condensation process of the liquid in the heat pipe 6; the heat pipe 6 is a conventional heat transfer element, which is used to conduct the heat generated by the conductive rod 11 to an area away from the insulating sleeve 2, thereby optimizing the overall heat dissipation effect of the oil-immersed transformer.

[0056] A positioning notch 332 is provided on the inner wall of the positioning ring 33 facing the insulating sleeve 2, into which one end of the heat pipe 6 is placed and fixed by welding. The end of the heat pipe 6 away from the positioning ring 33 is located above the positioning ring 33 and is bent in a direction away from the outer periphery of the insulating sleeve 2. A clamp 333 for fixing the heat pipe 6 is provided on the positioning ring 33. This is a conventional clamp 333 structure and will not be described in detail here.

[0057] Reference Figure 6 and Figure 7 Three locking members 7 are fixedly arranged on the transformer body 1. The three locking members 7 are evenly distributed around the outer circumference of the conductive rod 11. The locking member 7 includes a first bending portion 71 and a second bending portion 72 which are perpendicular to each other and fixedly connected. The bottom side of the first bending portion 71 is fixedly arranged on the upper side of the transformer body 1.

[0058] A first clearance slot 211 for the first bent portion 71 to be inserted into is formed on the side of the retaining ring 21 facing the transformer body 1 , and a second clearance slot 212 for the second bent portion 72 to be inserted into is formed on the outer periphery of the retaining ring 21 .

[0059] Reference Figure 7 and Figure 8 The edges of the first bending portion 71 and the second bending portion 72 facing the retaining ring 21 are both chamfered surfaces, which facilitates the first bending portion 71 and the second bending portion 72 to be inserted into the corresponding first and second making way slots 211 and 212 .

[0060] A positioning protrusion 711 with an arcuate outer surface is fixedly formed on the side of the first bending portion 71 away from the transformer body 1, and a positioning groove 2111 for the positioning protrusion 711 to be placed is opened on the inner wall of the first clearance slot 211, thereby further improving the installation stability of the first bending portion 71 in the first clearance slot 211.

[0061] Reference Fig. 9 and Fig.10 Three fixed card plates 8 are provided on the side of the positioning ring 33 facing the transformer body 1, wherein the positioning ring 33 is provided with a mounting groove 334 for inserting the fixed card plate 8, and the side of the fixed card plate 8 away from the fixed card groove 81 is hinged to the inner wall of the mounting groove 334 through a hinge shaft 83, and a reset member 82 for driving the fixed card plate 8 to rotate toward the insulating sleeve 2 is sleeved on the outer periphery of the hinge shaft 83, and the reset member 82 is a torsion spring 821 structure, which is not repeated here; the fixed card plate 8 is provided with a fixed card groove 81 for inserting the outer periphery of the heating pipe 6, and an elastic pad 84 made of rubber material is fixed to the inner wall of the fixed card groove 81 by glue.

[0062] The outer periphery of the end of the heat pipe 6 facing the insulating sleeve 2 can be placed into the fixing groove 81 , so that the fixing groove 81 on the fixing clamp plate 8 can further limit and tighten the heat pipe 6 , thereby improving the installation stability of the heat pipe 6 .

[0063] Reference Fig.11 and Fig.12A limit plate 9 for limiting the rotation of the fixed card plate 8 is detachably provided below the positioning ring 33. Two fixing blocks 92 are fixedly provided on the side of the limit plate 9 facing the bottom side of the positioning ring 33. A fixing groove 335 for the fixing block 92 to be embedded is provided on the positioning ring 33. A limiting protrusion 91 is fixedly formed on the limit plate 9.

[0064] When the limiting plate 9 is used to limit the rotation range of the fixed clamping plate 8, the fixing block 92 on the limiting plate 9 is embedded in the fixing groove 335. At this time, the limiting protrusion 91 on the limiting plate 9 is located between the fixed clamping plate 8 and the positioning ring 33, and the fixed clamping plate 8 cannot be rotated into the installation groove 334 under the action of the torsion spring 821.

[0065] Reference Fig.12 The edge of the fixed card plate 8 facing the retaining ring 21 is rounded, and a limiting card slot 721 for inserting the edge of the fixed card plate 8 toward the retaining ring 21 is provided on the second bent portion 72; when the limiting plate 9 is used to limit the rotation range of the fixed card plate 8, at this time, after the positioning ring 33 is installed, the fixed card plate 8 is fixed on the torsion spring 821 (see Fig. 9 ) and abut against the outer side surface of the second bending portion 72, and at the same time, the edge of the fixed clamping plate 8 is inserted into the corresponding limiting clamping groove 721.

[0066] The implementation principle of the embodiment of the present application is:

[0067] During the application of the oil-immersed transformer, the heat pipe 6 can improve its heat dissipation performance; in addition, the heat pipe 6 can be further fixed and limited by the fixing clamp 8, and the outer part of the second bending part 72 can also be abutted and locked by the fixing clamp 8, thereby improving the installation stability of the insulating sleeve 2.

[0068] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0069] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil-immersed power transformer, comprising a transformer body (1) and a plurality of conductive rods (11) fixedly mounted on the transformer body (1); characterized in that: An insulating sleeve (2) is sleeved on the outer circumference of the conductive rod (11), the outer diameter of the insulating sleeve (2) decreases in a direction away from the transformer body (1), and a fixing component (3) for fixing the insulating sleeve (2) is provided on the transformer body (1); The fixing assembly (3) comprises a plurality of positioning screws (31) fixedly mounted on the transformer body (1), positioning nuts (32) threadedly sleeved on the outer periphery of the positioning screws (31), and a positioning ring (33) sleeved on the outside of the insulating sleeve (2), wherein the positioning ring (33) is provided with positioning through holes (331) for the positioning screws (31) to pass through; a retaining ring (21) located below the positioning ring (33) is fixedly mounted on the outer periphery of the end of the insulating sleeve (2) facing the transformer body (1); A plurality of heat pipes (6) are arranged above the transformer body (1); a positioning notch (332) is provided on the inner wall of the positioning ring (33) facing the insulating sleeve (2) for inserting and fixing one end of the heat pipe (6); the end of the heat pipe (6) away from the positioning ring (33) is located above the positioning ring (33) and is bent and fixed in a direction away from the outer periphery of the insulating sleeve (2).

2. The oil-immersed power transformer according to claim 1, characterized in that: A fixing plate (8) is provided on the side of the positioning ring (33) facing the transformer body (1), the fixing plate (8) is provided with a fixing groove (81) for inserting the outer periphery of the heating pipe (6), and an elastic pad (84) is provided on the inner wall of the fixing groove (81).

3. An oil-immersed power transformer according to claim 2, characterized in that: The positioning ring (33) is provided with an installation groove (334) for the fixed card plate (8) to be placed therein; the side of the fixed card plate (8) away from the fixed card plate (81) is hinged to the inner wall of the installation groove (334) via a hinge shaft (83); and a reset member (82) is sleeved on the hinge shaft (83) for driving the fixed card plate (8) to rotate in a direction close to the insulating sleeve (2).

4. The oil-immersed power transformer according to claim 3, characterized in that: The transformer body (1) is provided with a locking member (7), the locking member (7) comprising a first bending portion (71) and a second bending portion (72) which are perpendicular to each other and fixedly connected; The first bent portion (71) is fixedly arranged on the transformer body (1); a first clearance slot (211) for the first bent portion (71) to be inserted is provided on the side surface of the retaining ring (21) facing the transformer body (1); and a second clearance slot (212) for the second bent portion (72) to be inserted is provided on the outer periphery of the retaining ring (21).

5. The oil-immersed power transformer according to claim 4, characterized in that: The positioning ring (33) is provided with a limiting plate (9) for limiting the rotation of the fixed clamping plate (8), and the limiting plate (9) is fixedly provided with a limiting protrusion (91) located between the fixed clamping plate (8) and the positioning ring (33); the second bent portion (72) is provided with a limiting groove (721) for the fixed clamping plate (8) to be inserted toward the edge of the retaining ring (21).

6. The oil-immersed power transformer according to claim 4, characterized in that: The edges of the first bent portion (71) and the second bent portion (72) facing the retaining ring (21) are both chamfered surfaces.

7. The oil-immersed power transformer according to claim 4, characterized in that: A positioning protrusion (711) is fixedly provided on the side of the first bending portion (71) away from the transformer body (1), and a positioning groove (2111) for the positioning protrusion (711) to be placed is provided on the inner wall of the first clearance slot (211).

8. A substation, characterized in that: It comprises a box body (4), a box door (5) arranged on the box body (4), and an oil-immersed power transformer as claimed in any one of claims 1 to 7.

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