Transformer switch line bank and transformer

Abstract

The invention relates to the technical field of transformers, in particular to a transformer switch connector bar and a transformer. The transformer switch connector bar comprises a transition bar and a wiring terminal, and the transition bar is provided with a transition fixing structure used for being fixedly connected with a wiring contact of a transformer switch; the wiring terminal is used for being connected with a wire led out from a transformer body, a transition welding part is further arranged on the transition bar, and the wiring terminal and the transition welding part are welded and fixed; during on-site wiring, the wiring terminal and the transition bar do not need to be fastened and connected through a bolt and the shielding cap does not need to be installed, wiring is convenient, the structure is simplified, the weight of the wiring bar is reduced, the contact resistance is reduced, and meanwhile the transition bar and the wiring terminal can be tinned as a whole. The overall tinning time is shortened; and the tinning amount is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a transformer switch terminal block and a transformer. Background Art

[0002] The oil-immersed transformer includes a body and a load switch arranged on one side of the body. The load switch is an important accessory for adjusting the gear of the transformer and plays a vital role. The load switch constitutes a transformer switch. Its basic structure can be found in the load tap changer disclosed in the Chinese utility model patent with the authorization announcement number CN201510795U. It includes an insulating cylinder and groups of static contacts arranged on the cylinder wall of the insulating cylinder. Each group of static contacts is distributed at different positions on the circumference of the insulating cylinder, and the same group of static contacts is distributed along the axial direction of the insulating cylinder. The load switch is connected to the body through a wire. The wire generally uses copper stranded wire as the transformer tap lead. One end of the wire is connected to the body and the other end is provided with a terminal for connecting to the static contact of the load switch. The static contact is provided with a wiring fixing hole for connecting to the terminal bolt. The static contact constitutes the wiring contact of the transformer switch.

[0003] The structure of the existing wiring contact is as follows Figure 1 , Figure 2 As shown, Figure 1 The wiring contact 1 is a single-hole structure, and only one wiring fixing hole 11 is provided. It is suitable for transformers with smaller rated currents. The rated current of large-capacity oil-immersed transformers is generally larger, and the maximum rated current of the matching on-load switch needs to be increased. When the maximum rated working current reaches 1000A, the wiring contact of the switch adopts Figure 2 In the double-hole structure shown, the wiring contact 1 has two wiring fixing holes 11. Since the wiring contacts of each group of switches are distributed in a circle, and each wiring contact is facing the body of the switch and facing away from the body of the switch, the copper stranded wire needs to be bent during wiring. The large-current transformer requires a copper stranded wire with a large cross-sectional area. In the actual wiring process, the bending angle of the copper stranded wire is too large, especially for the wiring contacts facing away from the body of the switch. It is not only laborious to bend, but also easy to cause the copper stranded wire to be too close to the switch and cause discharge. Therefore, a transition row is required for the high-current switch. The transition row and the wiring terminal are both made of copper and together constitute the wiring row. The structure of the transition row is as shown in FIG. Figure 3 As shown, transition fixing holes 21 are respectively provided at both ends of the transition row 2. The transition fixing hole at one end is used to cooperate with the wiring fixing hole of the wiring contact for bolt connection, and the transition fixing hole at the other end is used to cooperate with the wiring fixing hole on the wiring terminal for bolt connection, so as to lead the wiring part of the contact outward to meet the bending angle of the copper stranded wire. However, this structure requires an additional pair of bolts, and corresponding shielding caps need to be installed for the bolts and nuts. There are many parts to be installed, the structure is relatively complex, and it is inconvenient to operate during on-site wiring. Summary of the invention

[0004] The object of the present invention is to provide a transformer switch terminal block to solve the problem that the wiring operation is inconvenient when the transition block and the terminal block are bolted together on site between the switch and the body of the transformer; the object of the present invention is also to provide a transformer to solve the above problem.

[0005] The technical solution of the transformer switch wiring bank of the present invention is:

[0006] A transformer switch terminal block comprises a transition block and a terminal block. The transition block is provided with a transition fixing structure for fixedly connecting with a connection contact of a transformer switch. The terminal block is used to connect with a wire led out from a transformer body. The transition block is also provided with a transition welding portion. The terminal block is fixed by welding to the transition welding portion.

[0007] Beneficial effects: By arranging a transition welding portion on the transition bar to weld and fix the terminal block to the transition bar, the terminal block and the transition bar can be pre-welded together. During on-site wiring, there is no need to perform bolt fastening connection between the terminal block and the transition bar and install a shielding cap, which is conducive to convenient wiring, simplified structure, reduced weight of the terminal block, and reduced contact resistance. At the same time, the transition bar and the terminal block can be tinned as a whole, shortening the overall tinning time and reducing the tinning amount.

[0008] Furthermore, the connection terminal is overlapped with the transition welding portion.

[0009] Beneficial effect: The connection terminal and the transition row are overlapped, thereby increasing the contact area and facilitating welding and fixing.

[0010] Furthermore, an edge of one side of the transition row away from the transition fixing structure corresponds to the middle of the terminal block.

[0011] Beneficial effect: By overlapping a part of the terminal in the width direction and staggering a part, the length of the transition row can be shortened while satisfying welding requirements.

[0012] Furthermore, the connection terminal and the transition fixing structure are arranged at intervals.

[0013] Beneficial effect: It prevents the connection terminal from affecting the connection operation between the transition row and the connection contact.

[0014] Furthermore, the transition welding portion has an overlapping side surface overlapping the connecting terminal, and a side of the connecting terminal close to the transition fixing structure forms a fillet weld with the overlapping side surface.

[0015] Beneficial effects: The welding operation is convenient, and the gap between the terminal block and the transition fixing structure is used to facilitate the trimming of the fillet weld.

[0016] Furthermore, the transition fixing structure and the transition welding portion are arranged along a first direction, the terminal has a wiring welding portion welded and fixed to the transition row and a wiring fixing portion for fixing to the wire, the wiring welding portion and the wiring fixing portion are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0017] Beneficial effect: It is convenient to control the bending angle of the wire, so that the wire can be easily extended to the side of the switch facing away from the switch body to be connected with the wiring contact.

[0018] Furthermore, the transition fixing structure includes at least two transition fixing holes, and the transition fixing holes are arranged at intervals along the second direction.

[0019] Beneficial effect: matching with the wiring contact of the double-hole structure, reducing the protruding height of the wiring structure.

[0020] Furthermore, the connection terminal is a crimping terminal, which has a connection welding portion welded to the transition row and a connection fixing portion for crimping the wire.

[0021] Beneficial effects: The crimping terminal is used to fix the wire, the structure is reliable and the assembly is convenient.

[0022] Further, the transition fixing structure is located at the end of the transition row.

[0023] Beneficial effect: arranging the transition fixing structure close to the end of the transition row is beneficial to reducing the size of the transition row.

[0024] The technical solution of the transformer of the present invention is:

[0025] A transformer comprises a body, a transformer switch and a terminal block, wherein the terminal block comprises a transition block and a terminal block, wherein the transition block is provided with a transition fixing structure for fixedly connecting with a terminal contact of the transformer switch, the terminal block is used to connect with a wire led out of the transformer body, and the transition block is also provided with a transition welding portion, wherein the terminal block is fixed to the transition welding portion by welding.

[0026] Beneficial effects: By arranging a transition welding portion on the transition bar to weld and fix the terminal block to the transition bar, the terminal block and the transition bar can be pre-welded together. During on-site wiring, there is no need to perform bolt fastening connection between the terminal block and the transition bar and install a shielding cap, which is conducive to convenient wiring, simplified structure, reduced weight of the terminal block, and reduced contact resistance. At the same time, the transition bar and the terminal block can be tinned as a whole, shortening the overall tinning time and reducing the tinning amount.

[0027] Furthermore, the connection terminal is overlapped with the transition welding portion.

[0028] Beneficial effect: The connection terminal and the transition row are overlapped, thereby increasing the contact area and facilitating welding and fixing.

[0029] Furthermore, an edge of one side of the transition row away from the transition fixing structure corresponds to the middle of the terminal block.

[0030] Beneficial effect: By overlapping a part of the terminal in the width direction and staggering a part, the length of the transition row can be shortened while satisfying welding requirements.

[0031] Furthermore, the connection terminal and the transition fixing structure are arranged at intervals.

[0032] Beneficial effect: It prevents the connection terminal from affecting the connection operation between the transition row and the connection contact.

[0033] Furthermore, the transition welding portion has an overlapping side surface overlapping the connecting terminal, and a side of the connecting terminal close to the transition fixing structure forms a fillet weld with the overlapping side surface.

[0034] Beneficial effects: The welding operation is convenient, and the gap between the terminal block and the transition fixing structure is used to facilitate the trimming of the fillet weld.

[0035] Furthermore, the transition fixing structure and the transition welding portion are arranged along a first direction, the terminal has a wiring welding portion welded and fixed to the transition row and a wiring fixing portion for fixing to the wire, the wiring welding portion and the wiring fixing portion are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0036] Beneficial effect: It is convenient to control the bending angle of the wire, so that the wire can be easily extended to the side of the switch facing away from the switch body to be connected with the wiring contact.

[0037] Furthermore, the transition fixing structure includes at least two transition fixing holes, and the transition fixing holes are arranged at intervals along the second direction.

[0038] Beneficial effect: matching with the wiring contact of the double-hole structure, reducing the protruding height of the wiring structure.

[0039] Furthermore, the connection terminal is a crimping terminal, which has a connection welding portion welded to the transition row and a connection fixing portion for crimping the wire.

[0040] Beneficial effects: The crimping terminal is used to fix the wire, the structure is reliable and the assembly is convenient.

[0041] Further, the transition fixing structure is located at the end of the transition row.

[0042] Beneficial effect: arranging the transition fixing structure close to the end of the transition row is beneficial to reducing the size of the transition row. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of a wiring contact of an existing single-hole structure;

[0044] Figure 2 A schematic diagram of a wiring contact of an existing double-hole structure;

[0045] Figure 3 A schematic diagram of the existing transition row;

[0046] Figure 4 It is a structural schematic diagram of Embodiment 1 of the transformer switch wiring bank of the present invention;

[0047] Figure 5 for Figure 4 A cross-sectional view of the terminal block in FIG.

[0048] Figure 6 for Figure 4 Schematic diagram of the transition row in .

[0049] In the figure: 1. Wiring contact; 11. Wiring fixing hole; 2. Transition row; 21. Transition fixing hole; 3. Wiring terminal. DETAILED DESCRIPTION

[0050] Embodiment 1 of the transformer switch wiring bank of the present invention:

[0051] In this embodiment, a transition welding portion is provided on the transition bar to weld and fix the terminal block to the transition bar, so that the terminal block and the transition bar can be pre-welded together. During on-site wiring, there is no need to perform bolt fastening operations on the terminal block and the transition bar and to install a shielding cap, which is conducive to convenient wiring and helps to simplify the structure, reduce the weight of the terminal block, and reduce contact resistance. At the same time, the transition bar and the terminal block can be tinned as a whole, shortening the overall tinning time and reducing the tinning amount.

[0052] Specifically, combined Figure 2 and Figure 4 , Figure 5 , Figure 6 As shown, the transformer switch wiring bank includes a transition bank 2 and a wiring terminal 3. The transition bank 2 is provided with a transition fixing structure for fixedly connecting with the wiring contact 1 of the transformer switch. The wiring terminal 3 is used to connect with the wires drawn from the transformer body. The wiring terminal 3 is welded and fixed to the transition bank 2. The transformer switch is an on-load tap changer.

[0053] The transition bar 2 is a copper bar, and the transition bar 2 is a block. The transition fixing structure includes two transition fixing holes 21 arranged at the right end of the transition bar 2. The two transition fixing holes 21 are arranged at intervals up and down. Figure 2One end of the middle wiring contact 1 in the left-right direction is provided with two wiring fixing holes 11 spaced apart from each other, and the transition fixing hole 21 is used to correspond to the wiring fixing hole 11 on the wiring contact 1 so as to fix the transition row 2 to the wiring contact 1 by passing bolts. The left part of the transition row 2 constitutes a transition welding part, and the wiring terminal 3 is welded and fixed to the transition welding part.

[0054] The terminal block 3 is a crimping terminal, which has a wiring welding portion welded to the transition row 2 and a wiring fixing portion for crimping the wire. The wiring welding portion is flat, and the wiring fixing portion is cylindrical to form a crimping hole. The transition fixing structure and the transition welding portion are arranged along a first direction, and the wiring welding portion and the wiring fixing portion of the terminal block 3 are arranged along a second direction, and the first direction is perpendicular to the second direction. The first direction is the left-right direction, and the second direction is the up-down direction. The terminal block 3 is arranged vertically to the transition row 2, which facilitates the control of the bending angle of the wire, so that the wire can be easily extended to the side of the switch facing away from the body to connect with the corresponding wiring contact 1.

[0055] The connection welding part of the connection terminal 3 overlaps the transition welding part of the transition row 2, which is beneficial to increase the contact area and facilitate welding and fixing. The right half of the connection welding part in the left-right direction is in contact with the transition welding part, while the left half is staggered with the transition welding part. The left edge of the transition row 2 away from the transition fixing structure corresponds to the middle part of the connection terminal 3 in the left-right direction. The width direction of the connection terminal 3 is the left-right direction, so that a part of the width direction of the connection terminal 3 overlaps the transition row 2 and a part is staggered with the transition row 2, which can shorten the length of the transition row 2 while satisfying welding.

[0056] The transition welding portion of the transition row 2 has an overlapping side surface overlapping the connection terminal 3, and the overlapping side surface and the right side surface of the connection terminal 3 near the transition fixing hole 21 form a fillet weld. A side surface of the connection terminal 3 facing away from the crimping hole is in contact with the overlapping side surface. The right side surface of the connection terminal 3 is spaced apart from the transition fixing hole 21, and the space between the connection terminal 3 and the transition fixing hole 21 facilitates trimming of the fillet weld.

[0057] After the transition bar 2 is processed, the copper terminal 3 of the corresponding diameter is selected according to the copper stranded wire of the transformer tapping lead, and the terminal 3 and the transition bar 2 are welded; the copper stranded wire and the terminal 3 are cold pressed; when wiring, the transition bar 2 is connected to the wiring contact 1 by bolts;

[0058] The structure of the terminal block can shorten the assembly process time. When wiring, it is only necessary to tighten the transition block and the wiring contact, and no bolts are needed to connect the crimping terminals and the transition block. After welding, bolt connections are reduced. Since each wiring position has only two pairs of fasteners, only four shielding caps are needed, and the number of fasteners and shielding caps is reduced by half. The bending angle of the copper stranded wire is met to avoid discharge caused by the lead being too close to the switch. It is safe, reliable and has good performance. The transition block and the wiring terminal are welded, and the contact resistance is smaller than the contact resistance of bolt crimping. Only two holes need to be drilled in the transition block, and the wiring terminal does not need to be drilled, so the component processing is simple. The terminal block can tin the transition block and the wiring terminal as a whole, shortening the overall tinning time and reducing the tinning amount. The length of the transition block can be shortened by 30 mm and the weight can be reduced by 0.07 kg.

[0059] Embodiment 2 of the transformer switch wiring bank of the present invention:

[0060] This embodiment provides a different terminal arrangement form from that of the first embodiment. The difference between this embodiment and the first embodiment is that the terminal in the first embodiment overlaps the transition bar. In this embodiment, the terminal is butted against the transition bar, and the right side of the terminal is in contact with the left side of the transition bar.

[0061] Embodiment 3 of the transformer switch wiring bank of the present invention:

[0062] This embodiment provides a different transition row arrangement from that of Embodiment 1. The difference between this embodiment and Embodiment 1 is that the edge of one side of the transition row away from the transition fixing structure in Embodiment 1 corresponds to the middle of the terminal block. In this embodiment, the left side of the transition row is aligned with the left side of the terminal block.

[0063] Embodiment 4 of the transformer switch wiring bank of the present invention:

[0064] This embodiment provides a different arrangement of the wiring terminals from that of the first embodiment. The difference between this embodiment and the first embodiment is that the wiring terminals in the first embodiment are arranged at intervals from the transition fixing holes. In this embodiment, a notch is provided on the wiring terminals to avoid the transition fixing holes.

[0065] Embodiment 5 of the transformer switch wiring bank of the present invention:

[0066] This embodiment provides a different arrangement of the wiring terminals from that of the first embodiment. The difference between this embodiment and the first embodiment is that a fillet weld is formed between the side of the wiring terminal close to the transition fixing structure and the overlapping side surface in the first embodiment. In this embodiment, a fillet weld is formed between the wiring terminal and the left side surface of the transition row away from the transition fixing hole.

[0067] Embodiment 6 of the transformer switch wiring bank of the present invention:

[0068] This embodiment provides a different arrangement of the wiring terminals from that of the first embodiment. The difference between this embodiment and the first embodiment is that the wiring welding portion and the wiring fixing portion of the wiring terminals in the first embodiment are arranged in the vertical direction. In this embodiment, the wiring welding portion and the wiring fixing portion of the wiring terminals are arranged in the left-right direction.

[0069] Embodiment 7 of the transformer switch wiring bank of the present invention:

[0070] This embodiment provides a different transition row arrangement from that of Embodiment 1, and the difference between this embodiment and Embodiment 1 is that the transition fixing structure in Embodiment 1 includes two transition fixing holes. In this embodiment, only one transition fixing hole is provided on the transition row, and the transition fixing holes constitute the transition fixing structure.

[0071] Embodiment 8 of the transformer switch wiring bank of the present invention:

[0072] This embodiment provides a different arrangement of the connection terminal from that of the first embodiment. The difference between this embodiment and the first embodiment is that the connection welding portion of the crimping terminal in the first embodiment is flat. In this embodiment, the connection welding portion of the crimping terminal is cylindrical.

[0073] Embodiment 9 of the transformer switch wiring bank of the present invention:

[0074] This embodiment provides a different transition row arrangement from that of embodiment 1, and the difference between this embodiment and embodiment 1 is that the transition fixing holes in embodiment 1 are located at the ends of the transition row, while in this embodiment, the transition fixing holes are located in the middle of the transition row in the left-right direction.

[0075] Embodiment 10 of the transformer switch wiring bank of the present invention:

[0076] This embodiment provides a different transition row arrangement from that of Embodiment 1, and the difference between this embodiment and Embodiment 1 is that the transition fixing structure in Embodiment 1 includes two transition fixing holes. In this embodiment, studs are welded on the transition row, the studs constitute the transition fixing structure, and the studs pass through the wiring fixing holes on the wiring contacts to connect nuts.

[0077] Embodiment of the transformer in the present invention:

[0078] The transformer includes a body, a transformer switch and a terminal block. The terminal block in this embodiment is the same as the transformer switch terminal block in any of the above-mentioned embodiments 1-10 of the transformer switch terminal block, and will not be repeated here.

[0079] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transformer switch wiring bar, comprising a transition bar and a wiring terminal, wherein the transition bar is provided with a transition fixing structure for fixedly connecting with the wiring contact of the transformer switch, and the wiring terminal is used to connect with the wire led out from the transformer body, wherein: A transition welding portion is also provided on the transition row, and the connecting terminal is fixed to the transition welding portion by welding.

2. The transformer switch terminal block according to claim 1, characterized in that: The terminal is overlapped with the transition welding part.

3. The transformer switch terminal block according to claim 2, characterized in that: An edge of one side of the transition row away from the transition fixing structure corresponds to the middle of the wiring terminal.

4. The transformer switch terminal block according to claim 2 or 3, characterized in that: The wiring terminals are spaced apart from the transition fixed structure.

5. The transformer switch terminal block according to claim 4, characterized in that the transition The welding portion has an overlapping side surface overlapping with the connecting terminal, and a side of the connecting terminal close to the transition fixing structure forms a fillet weld with the overlapping side surface.

6. The transformer switch terminal block according to claim 1, 2 or 3, characterized in that the transition The fixing structure and the transition welding part are arranged along the first direction. The terminal has a wiring welding part welded and fixed to the transition row and a wiring fixing part for fixing to the wire. The wiring welding part and the wiring fixing part are arranged along the second direction. The first direction is perpendicular to the second direction.

7. The transformer switch terminal block according to claim 6, characterized in that: The transition fixing structure includes at least two transition fixing holes, and the transition fixing holes are arranged at intervals along the second direction.

8. The transformer switch terminal block according to claim 1, 2 or 3, characterized in that: The connection terminal is a crimping terminal, which comprises a connection welding portion welded to the transition row and a connection fixing portion for crimping the wire.

9. The transformer switch terminal block according to claim 1, 2 or 3, characterized in that: The transition fixing structure is located at the end of the transition row.

10. A transformer, comprising a transformer body, a transformer switch and a terminal block, characterized in that: The terminal block is a transformer switch terminal block as described in any one of claims 1 to 9.

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