Dry-type transformer convenient for hoisting high-voltage coil and low-voltage coil

Abstract

The utility model relates to the technical field of dry-type transformers, in particular to a dry-type transformer facilitating hoisting of high-voltage coils and low-voltage coils, which comprises an iron core assembly, three coil assemblies and three outgoing line copper bar groups, the iron core assembly comprises three vertically arranged vertical iron cores, each coil assembly comprises a high-voltage coil and a low-voltage coil with a first through hole, a vertical iron core penetrates through the first through hole, the low-voltage coil is sleeved with a high-voltage coil, the low-voltage coil is provided with outgoing line copper bar sets, each outgoing line copper bar set comprises a low-voltage inner outgoing line copper bar and a low-voltage outer outgoing line copper bar, and each of the low-voltage inner outgoing line copper bar and the low-voltage outer outgoing line copper bar comprises a connecting part and an extension part. According to the utility model, each extension part is detachably connected with the corresponding connecting part, so that the low-voltage coil can be hoisted first, then the high-voltage coil can be hoisted, and the hoisting is more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of dry-type transformers, and more specifically to a dry-type transformer that is convenient for hoisting high and low voltage coils. Background Art

[0002] A dry-type transformer is a transformer whose core and winding are not immersed in insulating oil. It is widely used in local lighting, high-rise buildings, airports, dock machinery and equipment and other places.

[0003] Our company currently has a dry-type transformer, such as Figure 1 As shown, it includes an iron core component 90, three coil components 91 and three outgoing copper bar groups 92. The iron core component 90 includes three vertically arranged vertical iron cores 901. Each of the coil components 91 includes a high-voltage coil 911 and a low-voltage coil 912. Each of the low-voltage coils 912 has a vertical iron core 901 passing through it. Each of the low-voltage coils 912 is sleeved with a high-voltage coil 911 on the outside. Each of the low-voltage coils 912 is provided with an outgoing copper bar group 92. The outgoing copper bar group 92 includes a low-voltage inner outgoing copper bar 921 and a low-voltage outer copper bar 922. One end of the low-voltage inner outgoing copper bar 921 is fixedly installed on the inner side of the low-voltage coil 912, and the low-voltage outer copper bar 922 is fixedly installed on the outer side of the low-voltage coil 912. The ends of the low-voltage inner outgoing copper bar 921 and the low-voltage outer copper bar 922 facing away from the low-voltage coil 912 both have an extension portion 9211 extending outward along the circumferential direction of the low-voltage coil 912. However, since the extension portion 9211 extends outwardly in the circumferential direction of the low-voltage coil 912, and the low-voltage inner-outgoing copper bar 921 and the low-voltage outer-outgoing copper bar 922 are both fixedly connected to the low-voltage coil 912, during installation, after arranging the vertical core 901, the operator can only hoist the high-voltage coil 911 to a specified position by hoisting equipment, and then hoist the low-voltage coil 912 so that the low-voltage coil 912 is located between the vertical core 901 and the high-voltage coil 911, but cannot hoist the low-voltage coil 911 to a specified position. 12, and then hoist the high-voltage coil 911. Otherwise, the high-voltage coil 911 will be blocked by the low-voltage inner copper busbar 921 and the low-voltage outer copper busbar 922 during its downward movement and cannot be mounted on the low-voltage coil 912. If the high-voltage coil 911 is hoisted first and then the low-voltage coil 912, it is necessary to consider whether the inner and outer sides of the low-voltage coil 912 collide with the vertical iron core 901 and the high-voltage coil 911 during the hoisting of the low-voltage coil 912. This requires high attention from the hoisting personnel and is relatively inconvenient.

[0004] Therefore, there is a need to provide a dry-type transformer that can first hoist the low-voltage coil and then the high-voltage coil, which is more convenient for hoisting. Utility Model Content

[0005] The main purpose of the present application is to provide a dry-type transformer that is convenient for hoisting high and low voltage coils, wherein the dry-type transformer that is convenient for hoisting high and low voltage coils includes a core assembly, three coil assemblies and three outgoing copper bar groups, the core assembly includes three vertically arranged vertical cores and two horizontally arranged horizontal cores, the two horizontal cores are respectively arranged at the two ends of the three vertical cores, each of the coil assemblies includes a high-voltage coil and a low-voltage coil, each of the low-voltage coils includes a first through hole, the first through hole extends from the bottom surface of the low-voltage coil to the top surface, each of the low-voltage coils is sleeved with a high-voltage coil on the outside, each of the first through holes is penetrated by a vertical core, and each of the low-voltage coils is provided with There is an outgoing copper bar group, each of which includes a low-voltage inner outgoing copper bar and a low-voltage outer copper bar. The low-voltage inner outgoing copper bar and the low-voltage outer copper bar each include a connecting portion and an extension portion. The two connecting portions are respectively fixedly connected to the hole wall of the first through hole and the outer side wall of the low-voltage coil, and each extension portion is detachably connected to the corresponding connecting portion. By designing the low-voltage inner outgoing copper bar and the low-voltage outer copper bar as separate parts and detachably connecting them, it is possible to first hoist the low-voltage coil and then hoist the high-voltage coil. During hoisting, only one side needs to be concerned about the collision. Compared with the prior art, the low-voltage coil can be hoisted first and then the high-voltage coil, which is more convenient for hoisting.

[0006] Another object of the present application is to provide a dry-type transformer that is convenient for hoisting high and low voltage coils, wherein each of the connecting parts has a first threaded hole at one end, and each of the connecting parts has an end of the first threaded hole extending out of the top opening of the first through hole by a predetermined distance, and each of the extension parts has a second threaded hole at one end, and the end of the connecting part having the first threaded hole is threadedly connected to the end of the extension part having the second threaded hole, and each of the connecting parts has a slide groove at one end having the first threaded hole, and each of the extension parts has a boss at one end having the second threaded hole, and when the first threaded hole is opposite to the second threaded hole, the boss extends into the slide groove, and the boss extends into the slide groove, and the extension part is threadedly connected to the connecting part, so as to realize the detachable connection between the extension parts and the corresponding connecting parts.

[0007] In order to achieve at least one of the above-mentioned invention purposes, the present application provides a dry-type transformer that is convenient for hoisting high and low voltage coils, wherein the dry-type transformer that is convenient for hoisting high and low voltage coils comprises:

[0008] An iron core assembly, the iron core assembly comprising three vertical iron cores arranged vertically and two horizontal iron cores arranged horizontally, the two horizontal iron cores are respectively arranged at two ends of the three vertical iron cores; and

[0009] Three coil assemblies, each of which includes a high-voltage coil and a low-voltage coil, each of which includes a first through hole extending from the bottom surface to the top surface of the low-voltage coil, a high-voltage coil is sleeved on the outside of each low-voltage coil, and a vertical iron core is inserted into each of the first through holes; and

[0010] Three outgoing copper bar groups, each of the low-voltage coils is provided with an outgoing copper bar group, each of the outgoing copper bar groups includes a low-voltage inner outgoing copper bar and a low-voltage outer outgoing copper bar, the low-voltage inner outgoing copper bar and the low-voltage outer outgoing copper bar each include a connecting portion and an extension portion, the two connecting portions are respectively fixedly connected to the hole wall of the first through hole and the outer side wall of the low-voltage coil, and each of the extension portions is detachably connected to the corresponding connecting portion.

[0011] In one or more embodiments of the present application, each of the connecting parts has a first threaded hole at one end, and each of the connecting parts has an end with the first threaded hole extending out of the top opening of the first through hole by a predetermined distance, and each of the extension parts has a second threaded hole at one end, and the end of the connecting part with the first threaded hole is threadedly connected to the end of the extension part with the second threaded hole.

[0012] In one or more embodiments of the present application, each of the connecting portions has a first threaded hole at one end and a slide groove, and each of the extending portions has a second threaded hole at one end and a boss, and when the first threaded hole is opposite to the second threaded hole, the boss extends into the slide groove.

[0013] In one or more embodiments of the present application, each of the extension portions having the second threaded hole has a material removal groove at one end, and the boss extends upward a predetermined distance from the bottom wall of the material removal groove. When the boss extends into the slide groove, an end face of the connecting portion having the first threaded hole abuts against the bottom wall of the material removal groove, and a side face of an end of the extension portion having the second threaded hole fits against a side face of an end of the connecting portion having the first threaded hole.

[0014] In one or more embodiments of the present application, one end of the two extension portions having the second threaded hole is respectively located on a side opposite to one end of the two connection portions having the first threaded hole.

[0015] In one or more embodiments of the present application, the side wall of the slide groove has a protrusion, and the side wall of the boss has a groove. The boss is slidably disposed in the slide groove, and allows the protrusion to extend into or out of the groove.

[0016] In one or more embodiments of the present application, each of the extension portions has an end facing away from the second threaded hole and has a slot, and the dry-type transformer that is convenient for hoisting high and low voltage coils also includes a plurality of ceramic sheets, and a ceramic sheet is provided between the low-voltage inner outgoing copper bar and the low-voltage outgoing copper bar of each outgoing copper bar group, and the two ends of the ceramic sheet extend into the slots of the low-voltage inner outgoing copper bar and the low-voltage outgoing copper bar, respectively.

[0017] In one or more embodiments of the present application, each of the coil assemblies further includes an annular insulating member, and the annular insulating member is located between the high-voltage coil and the low-voltage coil.

[0018] In an embodiment of the present application, a dry-type transformer that is convenient for hoisting high and low voltage coils includes a core assembly, three coil assemblies and three outgoing copper bar groups. The core assembly includes three vertically arranged vertical cores. The coil assembly includes a high-voltage coil and a low-voltage coil having a first through hole. The first through hole is penetrated by the vertical core. The high-voltage coil is sleeved on the outside of the low-voltage coil. An outgoing copper bar group is provided on the low-voltage coil. Each outgoing copper bar group includes a low-voltage inner outgoing copper bar and a low-voltage outer outgoing copper bar. The low-voltage inner outgoing copper bar and the low-voltage outer outgoing copper bar both include a connecting portion and an extension portion. The two connecting portions are respectively connected to the hole wall of the first through hole and the outer wall of the low-voltage coil. The utility model achieves the advantage of first hoisting the low-voltage coil and then hoisting the high-voltage coil by making each extension portion detachably connected to the corresponding connecting portion, which is more convenient for hoisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] These and / or other aspects and advantages of the present application will become clearer and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0020] Figure 1 The figure shows a half-section schematic diagram of an existing dry-type transformer;

[0021] Figure 2 The figure shows a half-section schematic diagram of a dry-type transformer that is convenient for hoisting high and low voltage coils according to the utility model;

[0022] Figure 3 Picture shows Figure 2 A partial enlarged view of point C. DETAILED DESCRIPTION

[0023] The terms and words used in the following specification and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0024] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0025] Although ordinals such as "first," "second," and the like will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more associated listed items.

[0026] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0027] Schematic diagram of dry-type transformers that are easy to hoist high and low voltage coils.

[0028] refer to Figures 2 to 3 According to a preferred embodiment of the utility model, a dry-type transformer that is easy to hoist high and low voltage coils includes a core assembly 10, three coil assemblies 20, three outgoing copper bar groups 30 and a frame 40.

[0029] Specifically, Figure 2 As shown, the core assembly 10 includes three vertical cores 101 arranged vertically and two horizontal cores (not marked in the figure), and the two horizontal cores are respectively arranged at the two ends of the three vertical cores 101. The three vertical cores 101 and the two horizontal cores are spliced ​​to form a "sun" shape tilted 90°. It should also be pointed out that before the coil assembly 20 is mounted on the vertical cores 101, only one horizontal core and the three vertical cores 101 are fixedly connected to the frame 40 to form a "mountain" shape. After the three coil assemblies 20 are respectively mounted on the three vertical cores 101, the remaining horizontal core is installed.

[0030] In addition, if Figure 2As shown, each of the coil assemblies 20 includes a high-voltage coil 201 and a low-voltage coil 202, and each of the low-voltage coil 202 includes a first through hole 2021, and the first through hole 2021 extends from the bottom surface of the low-voltage coil 202 to the top surface, and a high-voltage coil 201 is sleeved on the outside of each of the low-voltage coils 202, and a vertical iron core 101 is passed through each of the first through holes 2021.

[0031] In addition, if Figure 2 As shown, each of the low-voltage coils 202 is provided with an outgoing copper bar group 30, and each of the outgoing copper bar groups 30 includes a low-voltage inner outgoing copper bar 301 and a low-voltage outer outgoing copper bar 302, one end of the low-voltage inner outgoing copper bar 301 is welded to the inner wall of the first through hole 2021, one end of the low-voltage outer outgoing copper bar 302 is welded to the outer wall of the low-voltage coil 202, and the other ends of the low-voltage inner outgoing copper bar 301 and the low-voltage outer outgoing copper bar 302 both extend outward from the end of the low-voltage coil 202 by a predetermined distance.

[0032] In addition, to increase insulation, such as Figure 2 As shown, each coil assembly 20 further includes an annular insulating member 203 , and the annular insulating member 203 is located between the high-voltage coil 201 and the low-voltage coil 202 . The annular insulating member 203 includes but is not limited to an insulating cylinder made of polyester film.

[0033] It should be noted that, in the prior art, since the ends of the low-voltage inner copper bar 301 and the low-voltage outer copper bar 302 extending from the end of the low-voltage coil 202 are both located outside the low-voltage coil 202 in the projection in the height direction, when the high-voltage coil 201 and the low-voltage coil 202 are hoisted to the corresponding vertical core 101, the high-voltage coil 201 is hoisted first, and the high-voltage coil 201 is passed through the vertical core 101, and then the annular insulating member 203 is placed between the vertical core 101 and the high-voltage coil 201, and then the low-voltage coil 202 is lifted by the hoisting equipment. Lift it to the top of the vertical iron core 101, and make the low-voltage coil 202 be located between the annular insulating member 203 and the vertical iron core 101, and then move the low-voltage coil 202 downward. During this process, the hoisting personnel need to pay attention to avoid the hole wall of the first through hole 2021 from colliding with the vertical iron core 101. At the same time, it is also necessary to pay attention to avoid the outer wall of the low-voltage coil 202 from colliding with the inner wall of the high-voltage coil 201 after being fitted with the annular insulating member 203. Since it is necessary to pay attention to the collision on both the inside and outside at the same time, and the low-voltage coil 202 is large in size, the whole lowering process is slow and requires a high level of attention from the hoisting personnel.

[0034] In view of this, in the embodiments of the present application, Figure 2 and Figure 3 As shown, the low-voltage inner-outgoing copper busbar 301 and the low-voltage outer-outgoing copper busbar 302 both include a connecting portion 3011 and an extension portion 3012. The two connecting portions 3011 are respectively fixedly connected to the hole wall of the first through hole 2021 and the outer side wall of the low-voltage coil 202, and the fixed connection method includes but is not limited to welding. Each of the extension portions 3012 is detachably connected to the corresponding connecting portion 3011.

[0035] It should be noted that, by making the parts of the low-voltage inner copper bar 301 and the low-voltage outer copper bar 302 extending outward and the parts connected to the low-voltage coil 202 separate, when hoisting the low-voltage coil 202 and the high-voltage coil 201, the extension part 3012 and the connecting part 3011 are separated. At this time, the maximum radial dimension of the low-voltage coil 202 welded with the connecting part 3011 is the outer wall profile dimension of the low-voltage coil 202. When hoisting, the hoisting personnel can first hoist the low-voltage coil 202, and let the vertical core 101 pass through the low-voltage coil 202, and then The annular insulating member 203 is sleeved on the outside of the low-voltage coil 202, and then the high-voltage coil 201 is hoisted, and the inner hole wall of the high-voltage coil 201 is located on the outside of the annular insulating member 203. Finally, the extension part 3012 is connected to the connecting part 3011. It is obvious that in the above hoisting process, the hoisting personnel only need to pay attention to the collision in one side wall direction, and do not need to pay attention to the collision of the inner and outer side walls as in the prior art. The attention requirements of the hoisting personnel are relatively low, which helps to improve the hoisting efficiency and realize the advantage of hoisting the low-voltage coil 202 first and then the high-voltage coil 201, which is more convenient for hoisting.

[0036] Furthermore, in order to realize the detachable connection between the extension part 3012 and the connection part 3011, as Figure 3 As shown, each of the connecting parts 3011 has a first threaded hole 30111 at one end, and each of the connecting parts 3011 has an end of the first threaded hole 30111 extending out of the top opening of the first through hole 2021 by a predetermined distance, and each of the extension parts 3012 has a second threaded hole 30121 at one end, and the end of the connecting part 3011 with the first threaded hole 30111 and the end of the extension part 3012 with the second threaded hole 30121 are threadedly connected through external bolts.

[0037] Furthermore, in order to prevent the extension portion 3012 from rotating relative to the connection portion 3011 when a bolt is tightened, Figure 3As shown, each of the connecting portions 3011 has a first threaded hole 30111 at one end and a slide groove 30112, and each of the extension portions 3012 has a second threaded hole 30121 at one end and a boss 30122. When the first threaded hole 30111 is opposite to the second threaded hole 30121, the boss 30122 extends into the slide groove 30112.

[0038] More specifically, if Figure 3 As shown, each of the extension parts 3012 has a material removal groove 30123 at one end with the second threaded hole 30121, and the boss 30122 extends upward from the bottom wall of the material removal groove 30123 by a predetermined distance. When the boss 30122 extends into the slide groove 30112, the end face of the connecting part 3011 with the first threaded hole 30111 abuts against the bottom wall of the material removal groove 30123, and the side face of one end of the extension part 3012 with the second threaded hole 30121 abuts against the side face of one end of the connecting part 3011 with the first threaded hole 30111. It should be noted that by providing the material removal groove 30123, the contact plane between the extension part 3012 and the connecting part 3011 is further increased, which helps to prevent the extension part 3012 from moving relative to the connecting part 3011.

[0039] Furthermore, in order to ensure the spacing between the low-voltage inner outlet copper bar 301 and the low-voltage outer outlet copper bar 302, as Figure 3 As shown, one end of the two extension parts 3012 having the second threaded hole 30121 is respectively located on the opposite side of one end of the two connection parts 3011 having the first threaded hole 30111.

[0040] Furthermore, in order to prevent the external bolt from rotating relative to the connecting portion 3011 during the process of being screwed into the second threaded hole 30121 but not being screwed into the first threaded hole 30111, Figure 3 As shown, the side wall of the slide groove 30112 has a protrusion 30113, and the side wall of the boss 30122 has a groove 30124. The boss 30122 is slidably disposed in the slide groove 30112, and allows the protrusion 30113 to extend into or out of the groove 30124.

[0041] It should be noted that when installing the extension 3012 on the connecting portion 3011, the hoisting personnel make the boss 30122 located on one side of the slide groove 30112 and facing the slide groove 30112, and the protrusion 30113 faces the groove 30124, and then translate the extension 3012 toward the connecting portion 3011, and make the boss 30122 slide into the slide groove 30112. 2 are flush with the two end notches of the slide groove 30112, the first threaded hole 30111 is opposite to the second threaded hole 30121; since the protrusion 30113 is stuck in the groove 30124, the circumferential rotation of the extension part 3012 relative to the connecting part 3011 is restricted, so during the tightening process of the external bolt, the hoisting personnel only need to hold the extension part 3012 to prevent it from sliding along the length direction of the slide groove 30112.

[0042] Furthermore, if Figure 2 As shown, the end of each of the extensions 3012 away from the second threaded hole 30121 includes an inclined section 30125 and a vertical section 30126, and the vertical section 30126 is located at the end of the inclined section 30125 away from the boss 30122. Since the vertical section 30126 is relatively long, in order to prevent the vertical section 30126 on the low-voltage inner outlet copper bar 301 and the low-voltage outer outlet copper bar 302 from shaking easily under the action of external force, each of the extensions 3012 away from the second threaded hole 30 One end of 121 also has a slot 30127, specifically, the slot 30127 is located on the vertical section 30126, and the dry-type transformer that is convenient for hoisting high and low voltage coils 202 also includes a plurality of ceramic sheets 50, and a ceramic sheet 50 is provided between the low-voltage inner outgoing copper bar 301 and the low-voltage outgoing copper bar 302 of each outgoing copper bar group 30, and the two ends of the ceramic sheet 50 are respectively extended into the slots 30127 of the low-voltage inner outgoing copper bar 301 and the low-voltage outgoing copper bar 302.

[0043] It should be noted that before placing the ceramic sheet 50 into the slot 30127, the rigging personnel first apply glue to both ends of the ceramic sheet 50. When the two ends of the ceramic sheet 50 are extended into the slot 30127, the two ends of the ceramic sheet 50 are respectively bonded and connected to the low-voltage internal outlet copper bus 301 and the low-voltage external outlet copper bus 302.

[0044] In summary, the dry-type transformer that is easy to hoist high and low voltage coils based on the embodiment of the present application is explained, which provides the dry-type transformer that is easy to hoist high and low voltage coils with advantages such as being able to hoist the low voltage coil first and then the high voltage coil, making hoisting easier.

[0045] It is worth mentioning that in the embodiment of the present application, the dry-type transformer for facilitating the installation of high and low voltage coils has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the dry-type transformer for facilitating the installation of high and low voltage coils provided by the present application is easy to produce and has low cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0046] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A dry-type transformer that is convenient for hoisting high and low voltage coils, characterized in that: The dry-type transformer convenient for hoisting high and low voltage coils comprises An iron core assembly, the iron core assembly comprising three vertically arranged vertical iron cores and two horizontally arranged horizontal iron cores, the two horizontal iron cores are respectively arranged at two ends of the three vertical iron cores; as well as Three coil assemblies, each of which includes a high-voltage coil and a low-voltage coil, each of which includes a first through hole extending from the bottom surface to the top surface of the low-voltage coil, a high-voltage coil is sleeved on the outside of each low-voltage coil, and a vertical iron core is inserted into each of the first through holes; and Three outgoing copper bar groups, each of the low-voltage coils is provided with an outgoing copper bar group, each of the outgoing copper bar groups includes a low-voltage inner outgoing copper bar and a low-voltage outer outgoing copper bar, the low-voltage inner outgoing copper bar and the low-voltage outer outgoing copper bar each include a connecting portion and an extension portion, the two connecting portions are respectively fixedly connected to the hole wall of the first through hole and the outer side wall of the low-voltage coil, and each of the extension portions is detachably connected to the corresponding connecting portion.

2. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 1 is characterized in that: One end of each of the connecting parts has a first threaded hole, and one end of each of the connecting parts with the first threaded hole extends out of the top opening of the first through hole by a predetermined distance. One end of each of the extension parts has a second threaded hole, and one end of the connecting part with the first threaded hole is threadedly connected to one end of the extension part with the second threaded hole.

3. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 2 is characterized in that: Each of the connecting parts has an end with the first threaded hole and a slide groove, and each of the extension parts has an end with the second threaded hole and a boss. When the first threaded hole is opposite to the second threaded hole, the boss extends into the slide groove.

4. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 3 is characterized in that: Each of the extension portions has a material removal groove at one end having the second threaded hole, and the boss extends upward a predetermined distance from the bottom wall of the material removal groove. When the boss extends into the slide groove, an end face of the connecting portion having the first threaded hole abuts against the bottom wall of the material removal groove, and a side face of the extension portion having the second threaded hole fits against a side face of the connecting portion having the first threaded hole.

5. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 4 is characterized in that: One end of the two extension parts having the second threaded hole is respectively located on a side opposite to one end of the two connection parts having the first threaded hole.

6. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 5, characterized in that: The side wall of the slide groove has a protrusion, the side wall of the boss has a groove, the boss is slidably arranged in the slide groove, and the protrusion is extended into or out of the groove.

7. The dry-type transformer for facilitating the installation of high and low voltage coils according to any one of claims 2 to 6, characterized in that: Each of the extension parts has an end away from the second threaded hole and has a slot. The dry-type transformer that is convenient for hoisting high and low voltage coils also includes a plurality of ceramic sheets. A ceramic sheet is provided between the low-voltage inner outgoing copper bar and the low-voltage outgoing copper bar of each outgoing copper bar group, and the two ends of the ceramic sheet extend into the slots of the low-voltage inner outgoing copper bar and the low-voltage outgoing copper bar respectively.

8. The dry-type transformer for facilitating the installation of high and low voltage coils according to claim 7 is characterized in that: Each of the coil assemblies further includes an annular insulating member, and the annular insulating member is located between the high-voltage coil and the low-voltage coil.

Images