Lead device of regulating coil of transformer and regulating coil device of transformer

Abstract

The present application relates to a lead device for a tap coil of a transformer and a tap coil device of a transformer. The lead device can include: a ring-shaped pressing plate arranged at an axial end of the tap coil in an axial direction of the tap coil to limit axial displacement of the tap coil, the ring-shaped pressing plate including a radially recessed guide cutout opened at an outer circumferential portion, the guide cutout aligned with a lead-out end of the tap coil extending in the axial direction of the tap coil, the lead-out end introduced into the guide cutout and guided by the guide cutout to extend outward in a radial direction of the tap coil; and a lead-out frame mounted to the ring-shaped pressing plate at the guide cutout of the ring-shaped pressing plate at the axial end of the tap coil, the lead-out end of the tap coil guided out via the guide cutout extending out in the radial direction by the lead-out frame and fixed and supported by the lead-out frame. The lead device of the tap coil of the present disclosure enhances the structural stability of the coil, reduces the tendency of unspiral instability when short-circuiting, and reduces the stress and deformation risk of the lead.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power transformers, and in particular to a lead device for a regulating coil of a transformer capable of improving the short-circuit resistance of the coil and a regulating coil device of a transformer. BACKGROUND

[0002] Power transformers play a crucial role in power systems, used to convert voltages to meet different power transmission and distribution requirements. Short-circuit is a common fault in the operation of power transformers, which not only causes economic and energy loss, but also poses a serious threat to the safety and stability of the power system. In particular, in high-voltage and large-capacity transformers, the electromagnetic force and thermal effect generated by short-circuit can cause deformation of the coil, damage to the insulation, and even structural damage, therefore, improving the short-circuit resistance of the transformer coil has always been the focus and difficulty of research in this field.

[0003] The regulating coil, as a key component for voltage regulation in transformers, its performance directly affects the operational stability and life of the entire transformer. In the traditional structure of the regulating coil, the wires inside the coil are usually not effectively bound and fixed, which leads to the coil being prone to de-spiral instability phenomenon during short-circuit, affecting the short-circuit resistance of the coil. In addition, the outgoing line end (lead) of the regulating coil usually adopts a tee joint to connect the horizontal and vertical sections, this connection method may be subjected to a large stress during short-circuit, and has structural weaknesses. In addition, the outgoing line end is not effectively protected, which reduces the stability and reliability of the regulating coil under fault conditions.

[0004] In view of the above problems, there is an urgent need for a lead device for a regulating coil of a transformer and a regulating coil device of a transformer with the lead device to improve the stability and short-circuit resistance of the regulating coil under short-circuit conditions, while simplifying the connection process of the lead, increasing insulation protection, optimizing the layout of the lead, thereby improving production efficiency and reducing assembly difficulty. SUMMARY

[0005] To solve the above problems, the present disclosure proposes a lead device for a regulating coil of a transformer and a regulating coil device of a transformer, aiming to solve the shortcomings of the prior art and provide a more reliable and robust short-circuit resistance for power transformers.

[0006] According to an aspect of the embodiments of the present disclosure, a lead device for a tap coil of a transformer is provided, the lead device comprising: a ring-shaped pressing plate arranged at an axial end of the tap coil in an axial direction of the tap coil to limit axial displacement of the tap coil, an outer peripheral portion of the ring-shaped pressing plate being provided with a guide cutout recessed in a radial direction, the guide cutout being aligned with a lead-out end of the tap coil extending in the axial direction of the tap coil, the lead-out end of the tap coil being introduced into the guide cutout and guided by the guide cutout to extend outward in a radial direction of the tap coil; and a lead-out frame mounted to the ring-shaped pressing plate at the guide cutout of the ring-shaped pressing plate at the axial end of the tap coil, the lead-out end of the tap coil guided out via the guide cutout extending out in the radial direction by the lead-out frame and fixed and supported by the lead-out frame.

[0007] In this way, by arranging the ring-shaped pressing plate at the axial end of the tap coil, the lead-out path of the lead-out end is guided by the guide cutout provided on the ring-shaped pressing plate, thereby not only effectively limiting the axial displacement of the tap coil and avoiding coil instability due to unspiral under conditions such as short circuit, but also converting the axial lead-out of the lead-out end into radial lead-out, optimizing the lead-out mode of the lead, reducing stress concentration inside the coil, and improving the reliability of the tap coil. In addition, by mounting the lead-out frame at the guide cutout of the ring-shaped pressing plate of the tap coil, the lead-out frame can position, fix and support the extended lead-out end in the radial direction, ensuring the stability and safety of the lead under short circuit conditions. By closely cooperating with the ring-shaped pressing plate, the lead-out frame can fix the lead-out end from the lead-out root, so that the lead-out end can maintain the integrity of the coil structure when subjected to external stress, avoiding the cantilever effect that occurs in the traditional lead fixing mode, and significantly reducing the risk of deformation of the coil under fault conditions.

[0008] In an embodiment of the present disclosure, the outgoing ends of the voltage regulating coil include an upper outgoing end and a lower outgoing end, axial ends of the voltage regulating coil include an axial upper end and an axial lower end, the upper outgoing end is axially outgoing from the axial upper end of the voltage regulating coil, the lower outgoing end is axially outgoing from the axial lower end of the voltage regulating coil, the voltage regulating coil includes an inner coil and an outer coil sleeved outside the inner coil, the upper outgoing end includes an inner upper outgoing end axially outgoing from the inner coil at the axial upper end and an outer upper outgoing end axially outgoing from the outer coil at the axial upper end, the lower outgoing end includes an inner lower outgoing end axially outgoing from the inner coil at the axial lower end and an outer lower outgoing end axially outgoing from the outer coil at the axial lower end, each of the inner upper outgoing end, the outer upper outgoing end, the inner lower outgoing end and the outer lower outgoing end includes a plurality of outgoing heads with an identification, one outgoing head of the inner upper outgoing end with the same identification and one outgoing head of the outer upper outgoing end are mutually aligned and connected to each other to form one terminal of a first group of terminals with a corresponding identification, one outgoing head of the inner lower outgoing end with the same identification and one outgoing head of the outer lower outgoing end are mutually aligned and connected to each other to form one terminal of a second group of terminals with a corresponding identification, the position of the axial outgoing of the upper outgoing end is offset by a predetermined angle relative to the position of the axial outgoing of the lower outgoing end in a circumferential direction of the voltage regulating coil.

[0009] In an embodiment of the present disclosure, the annular pressing plate includes an upper annular pressing plate and a lower annular pressing plate, the guide cutout includes a first guide cutout opened at an outer circumferential portion of the upper annular pressing plate and a second guide cutout opened at an outer circumferential portion of the lower annular pressing plate, the first guide cutout is aligned with the inner upper outgoing end and the outer upper outgoing end to guide the inner upper outgoing end and the outer upper outgoing end, the second guide cutout is aligned with the inner lower outgoing end and the outer lower outgoing end to guide the inner lower outgoing end and the outer lower outgoing end, the outgoing frame includes an upper outgoing frame mounted to the first guide cutout of the upper annular pressing plate and a lower outgoing frame mounted to the second guide cutout of the lower annular pressing plate, the outgoing heads of the inner upper outgoing end and the outer upper outgoing end are extended out in a radial direction by the upper outgoing frame, the outgoing heads of the inner lower outgoing end and the outer lower outgoing end are extended out in the radial direction by the lower outgoing frame.

[0010] In this way, the voltage regulating coil is composed of an inner coil and an outer coil sleeved outside the inner coil, each of which is provided with an inner upper outgoing end and an outer upper outgoing end with outgoing heads aligned and connected to form a first group of terminal connectors, and an inner lower outgoing end and an outer lower outgoing end with outgoing heads aligned and connected to form a second group of terminal connectors, ensuring the orderly and corresponding connection of the outgoing ends. Furthermore, the axial outgoing positions of the upper outgoing ends and the axial outgoing positions of the lower outgoing ends are staggered by a predetermined angle in the circumferential direction of the voltage regulating coil, avoiding spatial overlap and possible electrical interference between the leads, while dispersing the electromagnetic force generated during short circuit through circumferential staggering, reducing the risk of deformation of the coil due to short circuit, and improving the short-circuit resistance stability and reliability of the voltage regulating coil as a whole.

[0011] In embodiments of the present disclosure, the lead device further comprises a first group of conductor rods including a plurality of side-by-side conductor rods extending in the axial direction of the voltage regulating coil towards the axial lower end, one of the conductor rods in the first group of conductor rods being electrically connected to one of the terminal connectors in the first group of terminal connectors; and a second group of conductor rods including a plurality of side-by-side conductor rods extending in the axial direction of the voltage regulating coil towards the axial upper end, one of the conductor rods in the second group of conductor rods being electrically connected to one of the terminal connectors in the second group of terminal connectors.

[0012] In this way, by introducing the first group of conductor rods and the second group of conductor rods, the electrical connection stability and mechanical strength of the voltage regulating coil are optimized. Through the additional conductor rod structure, the terminal connectors formed by the outgoing ends of the voltage regulating coil are stably connected to the external electrical system or components. Specifically, the first group of conductor rods are connected to the first group of terminal connectors and extend in the axial direction towards the axial lower end of the voltage regulating coil, and the second group of conductor rods are connected to the second group of terminal connectors and extend towards the axial upper end. This design not only ensures the efficiency and reliability of electrical connection, but also enhances the structural stability of the voltage regulating coil through the mechanical support of the conductor rods, effectively dispersing and absorbing the mechanical stress generated by sudden changes in current, preventing displacement or deformation of the outgoing ends due to uneven stress, thereby significantly improving the overall short-circuit resistance. In addition, the connection structure of the conductor rods and the terminal connectors also facilitates assembly and maintenance, simplifying the process flow of producing coils and wiring, improving production efficiency and component durability.

[0013] In the embodiments of the present disclosure, the lead device further comprises a plurality of first holders arranged at predetermined intervals in the axial direction of the voltage regulating coil, each of the plurality of first holders having a first array of through holes arranged in two rows, one of the first group of conductor bars being inserted into one of the first array of through holes of the first holder, each of the first group of conductor bars being arranged in the first array of through holes in a staggered manner according to the corresponding identification of the terminals in the first group of terminals; and a plurality of second holders arranged at predetermined intervals in the axial direction of the voltage regulating coil, each of the plurality of second holders having a second array of through holes arranged in two rows, one of the second group of conductor bars being inserted into one of the second array of through holes of the second holder, each of the second group of conductor bars being arranged in the second array of through holes in a staggered manner according to the corresponding identification of the terminals in the second group of terminals.

[0014] In this way, by arranging the plurality of first holders and the plurality of second holders, it is intended to optimize the connection of the conductor bars to the outgoing terminals of the voltage regulating coil and to enhance the stability of the overall structure of the coil. The plurality of first holders arranged at predetermined intervals in the axial direction of the voltage regulating coil provides precise positioning and support for the first group of conductor bars, while the first array of through holes on each first holder is designed in two rows, so that the terminals of the first group of terminals can be staggered according to the corresponding identification of the terminals in the first group of terminals, and the second group of terminals is arranged in a similar manner by the plurality of second holders, thereby facilitating electrical connection and ensuring the reliability of electrical connection, and also balancing the mechanical stress and avoiding the stress concentration problem commonly seen in traditional connection methods.

[0015] In the embodiments of the present disclosure, the lead device further comprises a first group of cables, one of the first group of cables being connected to one of the first group of conductor bars for connecting the upper outgoing terminal of the voltage regulating coil to an external switch; a second group of cables, one of the second group of cables being connected to one of the second group of conductor bars for connecting the lower outgoing terminal of the voltage regulating coil to the external switch, the first group of cables and the second group of cables being arranged in a stacked manner to form a cable stack structure, in which the first group of cables and the second group of cables are arranged in a plurality of layers of cables, each layer of cables comprising three cables.

[0016] In this way, by using uninterrupted leads, the vertical segments extending in the axial direction are converted into a layout of horizontal segments arranged in a staggered manner, making it possible to install a large number of leads in a limited space and making subsequent switch connection smoother, avoiding internal stress caused by assembly.

[0017] In the embodiments of the present disclosure, the cable stack structure is covered with an insulating protective sleeve on the outside.

[0018] In this way, the insulating protection structure of the horizontal section of the lead device is designed, which not only realizes the insulation protection function, but also reduces the difficulty of lead assembly and improves the production efficiency.

[0019] In the embodiments of the present disclosure, the number of wires of the inner coil and the outer coil is the same, the coils of the inner coil and the outer coil have the same number of layers formed by wires, and the wires of the inner coil are connected with the wires of the outer coil in the same layer.

[0020] In this way, the same number of wire layers and the same number of wires of the inner coil and the outer coil help to allow the optimization of the current regulation path, ensuring the smoothness and accuracy of the voltage regulation operation. In addition, the uniformity of the current distribution can be realized, and the performance of the voltage regulation coil device under high load conditions is significantly enhanced.

[0021] In the embodiments of the present disclosure, the outer peripheral wall of the annular pressing plate provided with the guide cutout has a flat surface, and the outlet frame is mounted to the flat surface.

[0022] In this way, the assembly stability of the lead device can be improved, the reliability of electrical connection can be ensured, and mechanical stress and wire damage during assembly can be reduced.

[0023] In the embodiments of the present disclosure, the guide cutout penetrates the outer peripheral part of the annular pressing plate from the position of the annular pressing plate located at the outlet end of the voltage regulation coil.

[0024] In this way, the outlet can be ensured to be smooth, stress concentration can be reduced, the stability of the coil structure can be enhanced, and smooth conversion from the axial direction to the radial direction can be realized.

[0025] In the embodiments of the present disclosure, the wires of the voltage regulation coil are spirally wound in multiple turns in the circumferential direction of the voltage regulation coil, the turns of the wires connected with the outlet end are divided into multiple sections in the circumferential direction, each section has a predetermined interval, in each section, the wires are grouped and bound, and one or more wires in the adjacent side of any two adjacent wire groups are simultaneously bound by the binding tape adjacent to and belonging to different wire groups.

[0026] In this way, the turns of the wires connected with the outlet end are divided into multiple sections, and a predetermined interval is maintained between each section. This interval design helps to disperse electrical stress and reduce the torque inside the coil when short-circuiting. In each section, the wires are grouped and bound, and one or more wires in the adjacent side of any two adjacent wire groups are simultaneously bound, but the binding tape adjacent to and belonging to different wire groups binds them. Without affecting the insulation performance, the inter-turn friction between the wires is improved, the mechanical connection between the wires is enhanced, the structural rigidity of the entire coil is improved, the de-spiral instability of the wires under conditions such as short-circuiting is effectively prevented, and the short-circuit resistance of the coil is significantly improved.

[0027] According to another embodiment of the present disclosure, a voltage regulating coil device of a transformer is provided, which includes an A-phase voltage regulating coil part, a B-phase voltage regulating coil part, and a C-phase voltage regulating coil part, one of the A-phase voltage regulating coil part, the B-phase voltage regulating coil part, and the C-phase voltage regulating coil part includes a voltage regulating coil, and a lead device as described above.

[0028] In another embodiment of the present disclosure, the cable layering structure extending in the horizontal direction of the A-phase voltage regulating coil part, the B-phase voltage regulating coil part, and the C-phase voltage regulating coil part is spaced apart from each other by a predetermined distance in the axial direction.

[0029] In this way, by maintaining a predetermined distance between the inter-phase cable layering structures in the axial direction, electrical isolation is effectively achieved, electromagnetic interference between the inter-phase cables is reduced, electrical independence and stability of each phase voltage regulating coil part during operation are ensured, and the operational efficiency and safety performance of the power transformer are improved.

[0030] In the present disclosure, the short-circuit resistance of the multi-outlet double-layer voltage regulating coil is improved, especially under short-circuit working conditions, the coil unspiral instability tendency and the complex stress on the lead are solved, thereby enhancing the stability and safety of the transformer during short-circuit failure. Specifically, the present disclosure aims to enhance the structural stability of the coil, reduce the unspiral instability tendency during short-circuit, reduce the stress and deformation risk of the lead, simplify the assembly process, and thereby improve the safety and reliability of the transformer under working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the present disclosure and constitute a part of the present disclosure, illustrate the exemplary embodiments of the present disclosure and serve to explain the present disclosure, and do not limit the present disclosure in any way. In the drawings:

[0032] Figure 1 A front view cross-sectional schematic diagram of a voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0033] Figure 2 A partial top view schematic diagram of a voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0034] Figure 3 A schematic diagram of a lead layout of a voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0035] Figure 4 A partial top view schematic diagram of a lead device of a voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0036] Figure 5 A schematic diagram showing the arrangement of the insulating protective sleeve externally wrapping the cable layering structure in the lead device of the voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0037] Figure 6 A schematic diagram showing the annular pressing plate according to an embodiment of the present disclosure is shown.

[0038] Figure 7 A schematic diagram showing the cross section taken along line C-C is shown. Figure 6

[0039] Figure 8 A schematic diagram showing the coil of the voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 100: voltage regulating coil device;

[0042] 10: voltage regulating coil;

[0043] 10A: inner coil;

[0044] 10B: outer coil;

[0045] 11: upper lead end;

[0046] 11A: inner upper lead end;

[0047] 11B: outer upper lead end;

[0048] 12: lower lead end;

[0049] 12A: inner lower lead end;

[0050] 12B: outer lower lead end;

[0051] 20: annular pressing plate;

[0052] 20A: upper annular pressing plate;

[0053] 20B: lower annular pressing plate;

[0054] 21: guide cutout;

[0055] 21A: first guide cutout;

[0056] 21B: second guide cutout;

[0057] 22: lead frame;

[0058] 22A: upper lead frame;

[0059] 22B: lower lead frame;

[0060] ​30: first group of conductor bars;

[0061] 40: second group of conductor bars;

[0062] 50: first holding member;

[0063] 60: second holding member;

[0064] 70: first group of cables;

[0065] 80: second group of cables;

[0066] 101A: A-phase insulation protection sleeve;

[0067] 101B: B-phase insulation protection sleeve;

[0068] 101D: C-phase insulation protection sleeve;

[0069] P: pad;

[0070] ST: stay;

[0071] SE: section. DETAILED DESCRIPTION

[0072] In order to make persons skilled in the art better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in the following with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative labor should fall within the protection scope of the present disclosure.

[0073] It should be noted that the terms "first", "second", and the like in the specification and claims of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the signals thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units or processes, methods, systems, products or devices does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0074] As discussed in the previous background technology, the voltage regulating coils in the prior art have the following problems: there is an obvious tendency of unwinding and becoming unstable under short-circuit conditions; there is a lack of a fixing mechanism for the lead wires, which easily forms a cantilever beam-type force-bearing structure, which in turn causes the lead structure and the coil connection part to bear additional stress during short circuit, causing potential safety hazards; the connection between the horizontal and vertical sections of the coil lead structure relies on a three-way joint, which not only increases the complexity of the structure, but may also become a weak point under short-circuit conditions; although the double-layer coil design is beneficial to current regulation, it faces challenges in space limitation and lead layout in actual deployment, especially a large number of leads are densely arranged and connected in a limited area, which easily generates internal stress caused by assembly and affects the overall mechanical stability; finally, the existing horizontal section lead protection measures are insufficient and lack effective insulation protection, which may lead to short-circuit accidents during production and operation.

[0075] To this end, the concept of the present invention is to set an annular pressure plate and a wire outlet frame at the axial end of the voltage-regulating coil, and guide the lead-out path of the wire end through the guide incision opened on the annular pressure plate. This not only effectively limits the axial displacement of the voltage-regulating coil, avoids the coil from de-coiling and becoming unstable under conditions such as short circuit, but also converts the axial lead-out of the wire end into a radial lead-out, and fixes the wire end from the root of the wire through the wire outlet frame, so that when it is subjected to external stress, it can maintain the integrity of the coil structure, avoid the cantilever beam effect that occurs in traditional lead fixing methods, and significantly reduce the risk of deformation of the coil under fault conditions.

[0076] Figure 1 is a front cross-sectional schematic diagram showing a voltage regulating coil device according to an embodiment of the present disclosure, Figure 2 FIG. 1 shows a partial top view of a voltage regulating coil device according to an embodiment of the present disclosure. Figure 3 A schematic diagram showing the lead layout of the voltage regulating coil device according to an embodiment of the present disclosure is shown. Figure 4 FIG. 1 is a partial top view schematic diagram of a lead device of a voltage regulating coil device according to an embodiment of the present disclosure, Figure 5 A schematic diagram showing the arrangement of the insulating protective sheath wrapped around the cable stack structure in the lead device of the voltage regulating coil device according to an embodiment of the present disclosure is shown. Figure 6 shows a schematic diagram of an annular pressure plate according to an embodiment of the present disclosure, Figure 7 Shown along Figure 6 A schematic cross-sectional view taken along line CC of FIG. Figure 8 A schematic diagram of a coil of a voltage regulating coil device according to an embodiment of the present disclosure is shown.

[0077] like Figure 1As shown, the voltage regulating coil device 100 may include: an A-phase voltage regulating coil portion 100A, a B-phase voltage regulating coil portion 100B, and a C-phase voltage regulating coil portion 100C.

[0078] Herein, the configurations of the A-phase voltage regulating coil section 100A, the B-phase voltage regulating coil section 100B, and the C-phase voltage regulating coil section 100C are substantially the same. The B-phase voltage regulating coil section 100B will be described below as a representative example, and redundant descriptions of the configurations of the A-phase voltage regulating coil section 100A and the C-phase voltage regulating coil section 100C will be omitted to avoid unnecessarily obscuring the subject matter to be protected by the present disclosure.

[0079] like Figures 1 to 8 As shown, the B-phase voltage regulating coil unit 100B may include: a voltage regulating coil 10 (such as Figure 8 As shown), the conducting wire of the voltage regulating coil 10 is wound with multiple turns in the circumferential direction of the voltage regulating coil 10; and a lead device, the structure of which will be described in detail below.

[0080] As an example, Figures 1 to 8 As shown, the lead-in device may include an annular pressure plate 20 (eg Figure 2 As shown in FIG), the axial end of the voltage regulating coil 10 is provided in the axial direction of the voltage regulating coil 10 to limit the axial displacement of the voltage regulating coil 10. As an example, the outer periphery of the annular pressure plate 20 may be provided with a radially recessed guide notch 21 (as shown in FIG). Figure 7 As shown), and the guide cutout 21 is aligned with the outlet end of the voltage regulating coil 10 extending in the axial direction of the voltage regulating coil 10 (as shown Figure 7 The lead end of the voltage regulating coil 10 is aligned with the guide cutout 21, so that the lead end of the voltage regulating coil 10 is introduced into the guide cutout 21 and is guided by the guide cutout 21 to extend outward in the radial direction of the voltage regulating coil 10.

[0081] like Figure 2 、 Figure 4 and Figure 7 As shown, the lead device may further include a lead frame 22, which is mounted to the guide cutout 21 of the annular pressure plate 20 at the axial end of the voltage regulating coil 10, so that the lead end of the voltage regulating coil 10 guided through the guide cutout 21 extends in the radial direction through the lead frame 22 and is fixed and supported by the lead frame 22.

[0082] In the examples of this disclosure, Figure 6 As shown, the annular pressure plate 20 can be, for example, a pressure ring, and the outer peripheral side wall 23 of the annular pressure plate 20 with the guide cutout 21 has a flat surface, and the wire frame 22 is mounted on the flat surface. As an example, further Figure 6As shown, the cross-sectional shape of the overall outer periphery of the annular pressing plate 20 can be polygonal, so that each side of the annular pressing plate 20 can serve as the arrangement region of the guide cutout 21 and the lead-out frame 22, thereby achieving flexibility of structure and facilitating adjustment of the position of the guide cutout 21 according to actual needs, optimizing the layout and lead-out path of the lead wire.

[0083] In addition, as shown in Figure 7 , the guide cutout 21 can be formed through the outer periphery of the annular pressing plate 20 from the position of the lead-out end of the voltage regulating coil 10 (as shown in Figure 8 ) to the position of the lead-out end (as shown in Figure 7 ) of the voltage regulating coil 10 (as shown in Figure 8 ), thereby guiding the axial lead-out of the voltage regulating coil 10 (as shown in ) to radial lead-out.

[0084] Figure 1 Further, as shown in Figure 8 and , the lead-out end of the voltage regulating coil 10 can include an upper lead-out end 11 and a lower lead-out end 12, the upper lead-out end 11 can be axially leaded out from the axial upper end of the voltage regulating coil 10, and the lower lead-out end 12 can be axially leaded out from the axial lower end of the voltage regulating coil 10.

[0085] Figure 8 As an example, as shown in , the voltage regulating coil 10 can have a double-layer structure, under this configuration, the voltage regulating coil 10 can include an inner coil 10A and an outer coil 10B sleeved outside the inner coil 10A, and the number of lead wires of the inner coil 10A and the outer coil 10B can be the same. Specifically, each lead wire of the coil of the inner coil 10A and the outer coil 10B forms a layer, therefore, the inner coil 10A and the outer coil 10B can have the same number of layers formed by lead wires, and the lead wires of the inner coil 10A are connected in parallel with the lead wires of the outer coil 10B at the same layer.

[0086] Figure 1 and Figure 8 , under the configuration that the voltage regulating coil 10 has a double-layer structure, the upper lead-out end 11 can include an inner upper lead-out end 11A axially leaded out from the axial upper end of the inner coil 10A and an outer upper lead-out end 11B axially leaded out from the axial upper end of the outer coil 10B, and the lower lead-out end 12 can include an inner lower lead-out end 12A axially leaded out from the axial lower end of the inner coil 10A and an outer lower lead-out end 12B axially leaded out from the axial lower end of the outer coil 10B.

[0087] As an example, each of the inner upper outlet terminal 11A, the outer upper outlet terminal 11B, the inner lower outlet terminal 12A and the outer lower outlet terminal 12B includes multiple protrusions with identification, one protrusion of the inner upper outlet terminal 11A with the same identification and one protrusion of the outer upper outlet terminal 11B are aligned with each other and connected to each other to form a wiring terminal with a corresponding identification, and one protrusion of the inner lower outlet terminal 12A with the same identification and one protrusion of the outer lower outlet terminal 12B are aligned with each other and connected to each other to form a wiring terminal with a corresponding identification.

[0088] like Figure 8 As shown, in this example, as the identification of the outlet, the outlet of the inner upper outlet terminal 11A can have, for example, numbers 2', 4', 6', 8', 10', 12', 14', ..., 2, 4, 6, 8, 10, 12, 14, ..., and the outlet of the outer upper outlet terminal 11B can have, for example, numbers 2', 4', 6', 8', 10', 12', 14', ..., 2, 4, 6, 8, 10, 12, 14,…, the protrusion of the inner lower outlet terminal 12A can have, for example, numbers 1', 3', 5', 7', 9', 11', 13',…, 1, 3, 5, 7, 9, 11, 13,…, and the protrusion of the outer lower outlet terminal 12B can have, for example, numbers 1', 3', 5', 7', 9', 11', 13',…, 1, 3, 5, 7, 9, 11, 13,…. By placing a spacer P between the terminals, the terminals of the inner upper terminal 11A and the outer upper terminal 11B, both with the same identification (e.g., number), are aligned, and the terminals of the inner lower terminal 12A and the outer lower terminal 12B, both with the same identification (e.g., number). In other words, terminals with the same number (e.g., 2) are aligned and connected to form a terminal with the corresponding number (e.g., 2). Spacer P, which can be made of epoxy board or laminated paperboard, is placed between the terminals to provide insulation and mechanical support between the terminals.

[0089] Further, if Figure 8 As shown, a support ST is provided between the wires of the voltage regulating coil 10 to insulate the wires from each other. Figure 8 As shown, the wire turns connected to the outlet are divided into multiple sections SE in the winding direction, with predetermined intervals between each section. Within each section SE, the wires are grouped and bound. One or more wires on adjacent sides of any two adjacent wire groups are simultaneously bound with binding tape from adjacent wire groups belonging to different wire groups. In other words, in this example of the present disclosure, the first and last wire turns connected to the outlet are bound with binding tape. The binding tape can be implemented using paper tape, i.e., crepe paper is used to bind the wires within a wire group.

[0090] Further, as an example, as shown in Figure 4 and Figure 8 , the heads of the inner upper outgoing terminal 11A and the heads of the outer upper outgoing terminal 11B with the same identification (e.g., the same number) are connected to each other to form one terminal in the first group of terminal 13 with the corresponding identification, for example, the corresponding identification of the terminals in the first group of terminal 13 can have the number 2’, 4’, 6’, 8’, 10’, 12’, 14’, …, 2, 4, 6, 8, 10, 12, 14, …, the heads of the inner lower outgoing terminal 12A and the heads of the outer lower outgoing terminal 12B with the same identification are connected to each other to form one terminal in the second group of terminal 14 with the corresponding identification, the corresponding identification of the terminals in the second group of terminal 14 can have the number 1’, 3’, 5’, 7’, 9’, 11’, 13’, …, 1, 3, 5, 7, 9, 11, 13, ….

[0091] As an example, as shown in Figure 4 , the position of the axial outgoing of the upper outgoing terminal 11 is offset by a predetermined angle in the circumferential direction of the voltage regulating coil 10 relative to the position of the axial outgoing of the lower outgoing terminal 12, i.e., they are not aligned with each other.

[0092] Still referring to Figure 2 , Figure 4 and Figure 8 , the annular pressing plate 20 can include an upper annular pressing plate 20A and a lower annular pressing plate 20B, the guide cutout 21 can include a first guide cutout 21A opened in the outer peripheral portion of the upper annular pressing plate 20A and a second guide cutout 21B opened in the outer peripheral portion of the lower annular pressing plate 20B, the first guide cutout 21A is aligned with the inner upper outgoing terminal 11A and the outer upper outgoing terminal 11B to guide the inner upper outgoing terminal 11A and the outer upper outgoing terminal 11B, the second guide cutout 21B is aligned with the inner lower outgoing terminal 12A and the outer lower outgoing terminal 12B to guide the inner lower outgoing terminal 12A and the outer lower outgoing terminal 12B. Accordingly, in combination with referring to Figure 2 , Figure 4 and Figure 8 , the outgoing frame 22 can include an upper outgoing frame 22A mounted to the upper annular pressing plate 20A and a lower outgoing frame 22B mounted to the lower annular pressing plate 20B, the heads of the inner upper outgoing terminal 11A and the outer upper outgoing terminal 11B extend out in the radial direction through the upper outgoing frame 22A, the heads of the inner lower outgoing terminal 12A and the outer lower outgoing terminal 12B extend out in the radial direction through the lower outgoing frame 22B.

[0093] Referring back to Figure 1 , Figure 4 and Figure 8The lead arrangement of the B-phase voltage regulating coil 100B can further include a first group of conductor bars 30 including a plurality of conductor bars arranged side by side extending toward an axially lower end of the voltage regulating coil 10, one of the first group of conductor bars 30 can be electrically connected to one of the first group of terminal posts 13 by, for example, a first group of connectors; and a second group of conductor bars 40 including a plurality of conductor bars arranged side by side extending toward an axially upper end of the voltage regulating coil 10, one of the second group of conductor bars 40 can be electrically connected to one of the second group of terminal posts 14 by, for example, a second group of connectors. As an example, the connectors in the first and second groups of connectors can be, for example, terminal ears, conductive screw terminals, or the like. As an example, each of the first and second groups of conductor bars 30, 40 can be, for example, copper bars.

[0094] As shown in FIG. 1, the lead arrangement of the B-phase voltage regulating coil 100B can further include a plurality of first retainers 50 arranged at predetermined intervals in an axial direction of the voltage regulating coil 10, each of the plurality of first retainers 50 having a first array of holes arranged in two rows, one of the first group of conductor bars 30 is inserted into one of the first array of holes of the first retainers 50, each of the first group of conductor bars 30 is arranged in the first array of holes in a manner that the terminal posts in the first group of terminal posts 13 are staggered according to their respective corresponding designations, for example, the conductor bars in the first group of conductor bars 30 that are connected to the terminal posts in the first group of terminal posts 13 having designations 2, 6, 10,..., 2', 6', 10',... are arranged in the first row of the first array of holes in sequence, the conductor bars in the first group of conductor bars 30 that are connected to the terminal posts in the first group of terminal posts 13 having designations 4, 8, 12,..., 4', 8', 12',... are arranged in the second row of the first array of holes in sequence; and a plurality of second retainers 60 arranged at predetermined intervals in the axial direction of the voltage regulating coil 10, each of the plurality of second retainers 60 having a second array of holes arranged in two rows, one of the second group of conductor bars 40 is inserted into one of the second array of holes of the second retainers 60, each of the second group of conductor bars 40 is arranged in the second array of holes in a manner that each of the terminal posts in the second group of terminal posts 14 is staggered according to its respective corresponding designation, for example, the conductor bars in the second group of conductor bars 40 that are connected to the terminal posts in the second group of terminal posts 14 having designations 1, 5, 9,..., 1', 5', 9',... are arranged in the first row of the second array of holes in sequence, the conductor bars in the second group of conductor bars 40 that are connected to the terminal posts in the second group of terminal posts 14 having designations 3, 7, 11,..., 3', 7', 11',... are arranged in the second row of the second array of holes in sequence. Figure 1 Figure 8 ​​

[0095] As shown in Figure 1 and Figure 3 , the lead arrangement of the B-phase regulating coil 100B can further include: a first set of cables 70 including a plurality of cables equal to the number of the conductor bars of the first set of conductor bars 30, each cable being connected to a conductor bar of the first set of conductor bars 30 for connecting the upper outgoing terminal of the regulating coil 10 to the external switch; each cable of the first set of cables 70 being electrically connected to a conductor bar of the first set of conductor bars 30, respectively, through, for example, a third set of connectors; a second set of cables 80 including a plurality of cables equal to the number of the conductor bars of the second set of conductor bars 40, each cable being connected to a conductor bar of the second set of conductor bars 40 for connecting the lower outgoing terminal of the regulating coil 10 to the external switch, each cable of the second set of cables 80 being electrically connected to a conductor bar of the second set of conductor bars 40, respectively, through, for example, a fourth set of connectors. As an example, the connectors of the third and fourth sets of connectors can be, for example, terminal lugs, conductive screw terminals, etc.

[0096] As shown in Figure 1 and Figure 3 , in the regulating coil arrangement 100 of the present disclosure, the first and second sets of cables 70, 80 are arranged in a cable layering structure in a horizontal direction perpendicular to the axial direction, for example, preferably, in the cable layering structure, the first and second sets of cables 70, 80 are both arranged in multiple layers of cables, each layer of cables including three cables, thereby achieving a double column vertical conversion three-row horizontal lead layout by bending, eliminating the use of three-way connectors.

[0097] As shown in Figure 1 and Figure 3 , by making the first and second sets of conductor bars 30, 40 in the A-phase regulating coil portion 100A, the B-phase regulating coil portion 100B and the C-phase regulating coil portion 100C have different lengths so as to extend different distances in the axial direction of the regulating coil 10 (as shown in Figure 8 ) to have different heights from the lower end of the regulating coil 10 (as shown in Figure 8 ), the cable layering structure extending in the horizontal direction of the A-phase regulating coil portion 100A, the B-phase regulating coil portion 100B and the C-phase regulating coil portion 100C can be spaced apart from each other by a predetermined distance H in the axial direction, thereby maintaining the predetermined distance of the inter-phase cable layering structure, effectively achieving electrical isolation, reducing electromagnetic interference between the inter-phase cables, ensuring electrical independence and stability of each phase regulating coil portion during operation, and improving the operating efficiency and safety performance of the power transformer.

[0098] Further as shown in Figure 1 and Figure 5As shown, the cable laminated structure of the A-phase voltage regulating coil part 100A, the B-phase voltage regulating coil part 100B and the C-phase voltage regulating coil part 100C can be respectively covered with an A-phase insulation protective sleeve 101A, a B-phase insulation protective sleeve 101B and a C-phase insulation protective sleeve 101C, for example, the cable laminated structure of the A-phase voltage regulating coil part 100A, the B-phase voltage regulating coil part 100B and the C-phase voltage regulating coil part 100C can be covered with insulation paper board to form the A-phase insulation protective sleeve 101A, the B-phase insulation protective sleeve 101B and the C-phase insulation protective sleeve 101C.

[0099] The above is a schematic description of the voltage regulating coil device and its lead device according to the present disclosure, which is used to help those skilled in the art to understand the content of the present disclosure, and the above examples do not limit the scope of the present disclosure.

[0100] The voltage regulating coil device and its lead device according to the present disclosure have at least the following advantages over the prior art:

[0101] 1. By using short-distance staggered axial paper binding inside the voltage regulating coil, the anti-unwinding ability of the coil is enhanced, and the stability of the coil structure can be maintained even under short-circuit conditions, avoiding deformation and failure of the coil.

[0102] 2. The outgoing lead frame fixed to the annular pressing plate reinforces the voltage regulating lead from the root, avoiding the formation of a cantilever beam structure, reducing the stress that the lead may bear when short-circuiting, and improving the mechanical stability of the lead.

[0103] 3. The introduction of a double-layer voltage regulating structure reduces the length of the large current horizontal section, reduces the difficulty of lead fixation, reduces the potential risk of deformation, and improves the overall design flexibility and efficiency of the voltage regulating coil.

[0104] 4. By using continuous leads and adjusting the layout, it is possible to install a large number of leads in a limited space, reducing the internal stress caused by assembly, making subsequent switch connection smoother, and improving the efficiency and reliability of transformer assembly.

[0105] 5. The insulation protection type of the voltage regulating lead horizontal section is improved, reducing the difficulty of lead assembly, improving production efficiency, and further improving the overall safety and reliability of the transformer.

[0106] In the above embodiments of the present disclosure, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0107] In several embodiments provided in the present disclosure, it should be understood that the disclosed technology can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be through some interfaces, indirect coupling or communication connection between units, and can be electrical or other forms.

[0108] The above is only the preferred embodiment of the present disclosure, and it should be pointed out that for ordinary skilled persons in the art, several improvements and refinements can be made without departing from the principles of the present disclosure, and these improvements and refinements should be considered as the protection scope of the present disclosure.

Claims

1. A lead device for a voltage regulating coil of a transformer, characterized in that: The lead device comprises: an annular pressure plate (20) disposed at an axial end of the voltage regulating coil (10) in the axial direction of the voltage regulating coil (10) to limit the axial displacement of the voltage regulating coil (10); a radially recessed guide notch (21) is provided on the outer periphery of the annular pressure plate (20); the guide notch (21) is aligned with an outlet end of the voltage regulating coil (10) extending in the axial direction of the voltage regulating coil (10); the outlet end of the voltage regulating coil (10) is introduced into the guide notch (21) and is guided by the guide notch (21) to extend outward in the radial direction of the voltage regulating coil (10); and An outlet frame (22) is mounted on the guide cutout (21) of the annular pressure plate (20) at the axial end of the voltage regulating coil (10), and the outlet end of the voltage regulating coil (10) guided through the guide cutout (21) extends in the radial direction through the outlet frame (22) and is fixed and supported by the outlet frame (22). The outlet end of the voltage regulating coil (10) includes an upper outlet end (11) and a lower outlet end (12), and the axial end of the voltage regulating coil (10) includes an axial upper end and an axial lower end. The upper outlet end (11) axially extends from the axial upper end of the voltage regulating coil (10), and the lower outlet end (12) axially extends from the axial lower end of the voltage regulating coil (10). The voltage regulating coil (10) comprises an inner coil (10A) and an outer coil (10B) sleeved on the outer side of the inner coil (10A). The upper outlet terminal (11) includes an inner upper outlet terminal (11A) extending axially from the inner coil (10A) at the axial upper end portion and an outer upper outlet terminal (11B) extending axially from the outer coil (10B) at the axial upper end portion, and the lower outlet terminal (12) includes an inner lower outlet terminal (12A) extending axially from the inner coil (10A) at the axial lower end portion and an outer lower outlet terminal (12B) extending axially from the outer coil (10B) at the axial lower end portion, each of the inner upper outlet terminal (11A), the outer upper outlet terminal (11B), the inner lower outlet terminal (12A) and the outer lower outlet terminal (12B) including a A plurality of outlets are provided with markings, a outlet of the inner upper outlet terminal (11A) and a outlet of the outer upper outlet terminal (11B) with the same marking are aligned with each other and connected to each other to form a terminal with a corresponding marking in a first group of terminal blocks (13), a outlet of the inner lower outlet terminal (12A) and a outlet of the outer lower outlet terminal (12B) with the same marking are aligned with each other and connected to each other to form a terminal with a corresponding marking in a second group of terminal blocks (14), and the position of the axial outlet of the upper outlet terminal (11) is offset by a predetermined angle relative to the position of the axial outlet of the lower outlet terminal (12) in the circumferential direction of the voltage regulating coil (10).

2. The lead wire device for the voltage regulating coil of a transformer according to claim 1, characterized in that: The annular pressure plate (20) includes an upper annular pressure plate (20A) and a lower annular pressure plate (20B), and the guide cutout (21) includes a first guide cutout (21A) opened on the outer periphery of the upper annular pressure plate (20A) and a second guide cutout (21B) opened on the outer periphery of the lower annular pressure plate (20B), the first guide cutout (21A) is aligned with the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B) to guide the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B), and the second guide cutout (21B) is aligned with the inner lower wire outlet end (12A) and the outer lower wire outlet end (12B) to guide the inner The side lower wire outlet end (12A) and the outer lower wire outlet end (12B), the wire outlet frame (22) includes an upper wire outlet frame (22A) installed at the first guide cutout (21A) of the upper annular pressure plate (20A) and a lower wire outlet frame (22B) installed at the second guide cutout (21B) of the lower annular pressure plate (20B), the outlet ends of the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B) extend in the radial direction through the upper wire outlet frame (22A), and the outlet ends of the inner lower wire outlet end (12A) and the outer lower wire outlet end (12B) extend in the radial direction through the lower wire outlet frame (22B).

3. The lead wire device for a voltage regulating coil of a transformer according to claim 2, characterized in that: The lead device further comprises: A first group of conductor bars (30) comprises a plurality of conductor bars arranged side by side and extending in the axial direction of the voltage regulating coil (10) toward the axial lower end portion, wherein one conductor bar in the first group of conductor bars (30) is electrically connected to one terminal in the first group of terminal blocks (13); and The second group of conductor bars (40) comprises a plurality of conductor bars arranged side by side and extending in the axial direction of the voltage regulating coil (10) toward the axial upper end portion, wherein one conductor bar in the second group of conductor bars (40) is electrically connected to one terminal in the second group of terminal blocks (14).

4. The lead wire device for a voltage regulating coil of a transformer according to claim 3, characterized in that: The lead device further comprises: a plurality of first retaining members (50), the plurality of first retaining members (50) being arranged at predetermined intervals in the axial direction of the voltage regulating coil (10), each of the plurality of first retaining members (50) having a first through-hole array arranged in two rows, one conductor bar of the first group of conductor bars (30) being inserted into one through-hole in the first through-hole array of the first retaining member (50), and each conductor bar of the first group of conductor bars (30) being arranged in the first through-hole array in a staggered manner according to corresponding identifications of the connection terminals in the first group of connection terminals (13); and A plurality of second retaining members (60), wherein the plurality of second retaining members (60) are arranged at predetermined intervals in the axial direction of the voltage regulating coil (10), each of the plurality of second retaining members (60) having a second through-hole array arranged in two rows, a conductor bar in the second group of conductor bars (40) being inserted into a through-hole in the second through-hole array of the second retaining member (60), and each conductor bar in the second group of conductor bars (40) being arranged in the second through-hole array in a staggered manner according to corresponding identifications of the terminal blocks in the second group of terminal blocks (14).

5. The lead wire device for the voltage regulating coil of a transformer according to claim 4, characterized in that: The lead device further comprises: a first set of cables (70), one cable in the first set of cables (70) being connected to one of the first set of conductor bars (30) for connecting the upper outlet terminal (11) of the voltage regulating coil (10) to an external switch, a second group of cables (80), one of the cables in the second group of cables (80) being connected to one of the conductor bars in the second group of conductor bars (40) for connecting the lower outlet terminal (12) of the voltage regulating coil (10) to the external switch, The first group of cables (70) and the second group of cables (80) are stacked to form a cable stack structure, in which the first group of cables (70) and the second group of cables (80) are arranged into multiple layers of cables, each layer of cables including three cables.

6. The lead wire device for the voltage regulating coil of a transformer according to claim 5, characterized in that: The outer side of the cable stacking structure is covered with an insulating protective sheath.

7. The lead wire device for a voltage regulating coil of a transformer according to claim 1, characterized in that: The inner coil (10A) and the outer coil (10B) have the same number of conductive wires, the inner coil (10A) and the outer coil (10B) have the same number of layers formed by conductive wires, and the conductive wires of the inner coil (10A) are connected to the conductive wires of the outer coil (10B) located in the same number of layers.

8. The lead wire device for a voltage regulating coil of a transformer according to claim 1, characterized in that: The outer peripheral side wall of the annular pressure plate (20) on which the guide notch (21) is opened has a flat surface, and the wire outlet frame (22) is mounted on the flat surface.

9. The lead wire device for a voltage regulating coil of a transformer according to claim 1, characterized in that: The guide cutout (21) passes through the outer periphery of the annular pressing plate (20) from the position of the annular pressing plate (20) at the outlet end of the voltage regulating coil (10).

10. The lead wire device for a voltage regulating coil of a transformer according to claim 1, characterized in that: The wire of the voltage regulating coil (10) is wound with multiple turns, and the wire turns connected to the outlet end are divided into multiple sections (SE) in the winding direction, with a predetermined interval between each section (SE). In each section (SE), the wires are grouped and bound, and one or more wires on adjacent sides of any two adjacent groups of wires are simultaneously bound by adjacent binding bands belonging to different wire groups.

11. A voltage regulating coil device for a transformer, characterized in that: include: An A-phase voltage regulating coil unit (100A), a B-phase voltage regulating coil unit (100B), and a C-phase voltage regulating coil unit (100C), wherein one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C) comprises: A voltage regulating coil (10), wherein the conducting wire of the voltage regulating coil (10) is wound with multiple turns; and A lead device, comprising: an annular pressure plate (20) is provided at an axial end of the voltage regulating coil (10) in the axial direction of the voltage regulating coil (10) to limit the axial displacement of the voltage regulating coil (10); a radially recessed guide notch (21) is provided on the outer periphery of the annular pressure plate (20); the guide notch (21) is aligned with an outlet end of the voltage regulating coil (10) extending in the axial direction of the voltage regulating coil (10); the outlet end of the voltage regulating coil (10) is introduced into the guide notch (21) and is guided by the guide notch (21) to extend outward in the radial direction of the voltage regulating coil (10); and An outlet frame (22) is mounted on the guide cutout (21) of the annular pressure plate (20) at the axial end of the voltage regulating coil (10), and the outlet end of the voltage regulating coil (10) guided through the guide cutout (21) extends in the radial direction through the outlet frame (22) and is fixed and supported by the outlet frame (22). Wherein, in one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B) and the C-phase voltage regulating coil unit (100C): The outlet end of the voltage regulating coil (10) includes an upper outlet end (11) and a lower outlet end (12), and the axial end of the voltage regulating coil (10) includes an axial upper end and an axial lower end. The upper outlet end (11) axially extends from the axial upper end of the voltage regulating coil (10), and the lower outlet end (12) axially extends from the axial lower end of the voltage regulating coil (10). The voltage regulating coil (10) comprises an inner coil (10A) and an outer coil (10B) sleeved on the outer side of the inner coil (10A). The upper outlet terminal (11) includes an inner upper outlet terminal (11A) extending axially from the inner coil (10A) at the axial upper end portion and an outer upper outlet terminal (11B) extending axially from the outer coil (10B) at the axial upper end portion, and the lower outlet terminal (12) includes an inner lower outlet terminal (12A) extending axially from the inner coil (10A) at the axial lower end portion and an outer lower outlet terminal (12B) extending axially from the outer coil (10B) at the axial lower end portion, each of the inner upper outlet terminal (11A), the outer upper outlet terminal (11B), the inner lower outlet terminal (12A) and the outer lower outlet terminal (12B) including a A plurality of outlets are provided with markings, a outlet of the inner upper outlet terminal (11A) and a outlet of the outer upper outlet terminal (11B) with the same marking are aligned with each other and connected to each other to form a terminal with a corresponding marking in a first group of terminal blocks (13), a outlet of the inner lower outlet terminal (12A) and a outlet of the outer lower outlet terminal (12B) with the same marking are aligned with each other and connected to each other to form a terminal with a corresponding marking in a second group of terminal blocks (14), and the position of the axial outlet of the upper outlet terminal (11) is offset by a predetermined angle relative to the position of the axial outlet of the lower outlet terminal (12) in the circumferential direction of the voltage regulating coil (10).

12. The voltage regulating coil device of the transformer according to claim 11, characterized in that: In one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C): The annular pressure plate (20) includes an upper annular pressure plate (20A) and a lower annular pressure plate (20B), and the guide cutout (21) includes a first guide cutout (21A) opened on the outer periphery of the upper annular pressure plate (20A) and a second guide cutout (21B) opened on the outer periphery of the lower annular pressure plate (20B), the first guide cutout (21A) is aligned with the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B) to guide the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B), and the second guide cutout (21B) is aligned with the inner lower wire outlet end (12A) and the outer lower wire outlet end (12B) to guide the inner The side lower wire outlet end (12A) and the outer lower wire outlet end (12B), the wire outlet frame (22) includes an upper wire outlet frame (22A) installed at the first guide cutout (21A) of the upper annular pressure plate (20A) and a lower wire outlet frame (22B) installed at the second guide cutout (21B) of the lower annular pressure plate (20B), the outlet ends of the inner upper wire outlet end (11A) and the outer upper wire outlet end (11B) extend in the radial direction through the upper wire outlet frame (22A), and the outlet ends of the inner lower wire outlet end (12A) and the outer lower wire outlet end (12B) extend in the radial direction through the lower wire outlet frame (22B).

13. The voltage regulating coil device of the transformer according to claim 12, characterized in that: The lead device of one of the A-phase voltage regulating coil part (100A), the B-phase voltage regulating coil part (100B) and the C-phase voltage regulating coil part (100C) further comprises: A first group of conductor bars (30) comprises a plurality of conductor bars arranged side by side and extending in the axial direction of the voltage regulating coil (10) toward the axial lower end portion, wherein one conductor bar in the first group of conductor bars (30) is electrically connected to one terminal in the first group of terminal blocks (13); and The second group of conductor bars (40) comprises a plurality of conductor bars arranged side by side and extending in the axial direction of the voltage regulating coil (10) toward the axial upper end portion, wherein one conductor bar in the second group of conductor bars (40) is electrically connected to one terminal in the second group of terminal blocks (14).

14. The voltage regulating coil device of the transformer according to claim 13, characterized in that: The lead device of one of the A-phase voltage regulating coil part (100A), the B-phase voltage regulating coil part (100B) and the C-phase voltage regulating coil part (100C) further comprises: a plurality of first retaining members (50), the plurality of first retaining members (50) being arranged at predetermined intervals in the axial direction of the voltage regulating coil (10), each of the plurality of first retaining members (50) having a first through-hole array arranged in two rows, one conductor bar of the first group of conductor bars (30) being inserted into one through-hole in the first through-hole array of the first retaining member (50), and each conductor bar of the first group of conductor bars (30) being arranged in the first through-hole array in a staggered manner according to corresponding identifications of the connection terminals in the first group of connection terminals (13); and A plurality of second retaining members (60), wherein the plurality of second retaining members (60) are arranged at predetermined intervals in the axial direction of the voltage regulating coil (10), each of the plurality of second retaining members (60) having a second through-hole array arranged in two rows, a conductor bar in the second group of conductor bars (40) being inserted into a through-hole in the second through-hole array of the second retaining member (60), and each conductor bar in the second group of conductor bars (40) being arranged in the second through-hole array in a staggered manner according to corresponding identifications of the terminal blocks in the second group of terminal blocks (14).

15. The voltage regulating coil device of the transformer according to claim 14, characterized in that: The lead device of one of the A-phase voltage regulating coil part (100A), the B-phase voltage regulating coil part (100B) and the C-phase voltage regulating coil part (100C) further comprises: a first set of cables (70), one cable in the first set of cables (70) being connected to one of the first set of conductor bars (30) for connecting the upper outlet terminal (11) of the voltage regulating coil (10) to an external switch, a second group of cables (80), one of the cables in the second group of cables (80) being connected to one of the conductor bars in the second group of conductor bars (40) for connecting the lower outlet terminal (12) of the voltage regulating coil (10) to the external switch, The first group of cables (70) and the second group of cables (80) are stacked to form a cable stack structure, in which the first group of cables (70) and the second group of cables (80) are arranged into multiple layers of cables, each layer of cables including three cables.

16. The voltage regulating coil device of the transformer according to claim 15, characterized in that: In one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C): The outer side of the cable stacking structure is covered with an insulating protective sheath.

17. The voltage regulating coil device of the transformer according to claim 16, characterized in that: The cable stack structures extending in the horizontal direction of the A-phase voltage regulating coil portion (100A), the B-phase voltage regulating coil portion (100B), and the C-phase voltage regulating coil portion (100C) are spaced apart from each other by a predetermined distance in the axial direction.

18. The voltage regulating coil device of the transformer according to claim 11, characterized in that: In one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C): The inner coil (10A) and the outer coil (10B) have the same number of conductive wires, the inner coil (10A) and the outer coil (10B) have the same number of layers formed by conductive wires, and the conductive wires of the inner coil (10A) are connected to the conductive wires of the outer coil (10B) located in the same number of layers.

19. The voltage regulating coil device of the transformer according to claim 11, characterized in that: In one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C): The outer peripheral side wall of the annular pressure plate (20) on which the guide notch (21) is opened has a flat surface, and the wire outlet frame (22) is mounted on the flat surface.

20. The voltage regulating coil device of the transformer according to claim 11, characterized in that: In one of the A-phase voltage regulating coil unit (100A), the B-phase voltage regulating coil unit (100B), and the C-phase voltage regulating coil unit (100C): The guide cutout (21) passes through the outer periphery of the annular pressing plate (20) from the position of the annular pressing plate (20) at the outlet end of the voltage regulating coil (10).

21. The voltage regulating coil device of the transformer according to claim 11, characterized in that: The wire turns connected to the outlet terminal are divided into a plurality of segments (SE) in the winding direction, with a predetermined interval between each segment (SE). In each segment (SE), the wires are grouped and bound, and one or more wires on adjacent sides of any two adjacent groups of wires are simultaneously bound by adjacent binding bands belonging to different wire groups.

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