Low-voltage lead structure of 10kV grounding transformer
By introducing a phase bus, neutral bus, and lead wire insulator connection structure into the 10kV grounding transformer, combined with the welding of the outgoing copper busbar and the upper clamp bracket, the mechanical and thermal stress problems during short circuits are solved, the mechanical strength and electrical connection stability of the low-voltage leads are enhanced, and the safety and operating efficiency of the transformer are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU SIEYUAN SPECIAL TRANSFORMER CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-14
AI Technical Summary
When a conventional 10kV grounding transformer is short-circuited, the windings and low-voltage copper busbars experience mechanical and thermal stress due to the increased current, leading to structural damage and vibration, increasing dynamic load, and reducing the transformer's safety and stability.
The system adopts a connection structure of phase bus, neutral bus and lead wire insulator. The phase bus and neutral bus are connected by lead wire insulator, and the connection stability is enhanced by copper busbars and welding. Combined with the upper clamp and bracket, it forms an integral structure, which enhances mechanical strength and reduces vibration dynamic load.
It effectively enhances the mechanical strength of the low-voltage leads, reduces the additional dynamic load caused by vibration, improves short-circuit withstand capability and electrical connection stability, and enhances the safety and operating efficiency of the transformer.
Smart Images
Figure CN224501645U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the power industry, specifically to dry-type grounding transformers in the field of power transmission and distribution, and more specifically, to a low-voltage lead structure for a 10kV grounding transformer. Background Technology
[0002] When a conventional grounding transformer experiences a short circuit, a huge current is generated inside the windings, resulting in a significant electromagnetic force. This electromagnetic force is converted into mechanical stress, impacting the transformer's structure and causing deformation or damage to components such as the windings and core. This mechanical stress may manifest as axial and radial forces, acting along the axial and radial directions of the windings respectively, altering the coil structure and generating strong vibrations. During this process, these vibrations impose additional dynamic loads on the transformer's structure, increasing its stress complexity.
[0003] When a conventional 10kV grounding transformer experiences a short circuit, the current increases rapidly due to the fault, far exceeding the normal carrying capacity of the low-voltage copper busbar. This rapidly increasing current generates enormous thermal and mechanical stress on the copper busbar. Under the impact of the short-circuit current, the copper busbar may be subjected to strong electromagnetic forces, leading to mechanical damage such as bending and breakage. The short-circuit current also causes the low-voltage copper busbar to heat up rapidly, generating thermal stress. This thermal stress can also cause mechanical damage to the copper busbar, such as uneven expansion and contraction. Furthermore, the impact of the short-circuit current may cause vibrations throughout the power system. This vibration is transmitted to the low-voltage copper busbar, subjecting it to additional mechanical stress and thus exacerbating the damage. Utility Model Content
[0004] In view of one of the defects in the prior art, the purpose of this application is to provide a low-voltage lead structure for a 10kV grounding transformer.
[0005] A first aspect of this application provides a low-voltage lead structure for a 10kV grounding transformer, comprising: a phase busbar, a neutral busbar, and lead insulators;
[0006] The phase row and the neutral row are connected by the lead insulator;
[0007] The phase array includes an a-phase array, a b-phase array, and a c-phase array. The lead insulator includes a first lead insulator and a second lead insulator. The a-phase array, the b-phase array, and the c-phase array are respectively connected to the zero array through the first lead insulator and the second lead insulator.
[0008] Optionally, it also includes outgoing copper busbars, which are connected to the phase busbar and the neutral busbar by welding.
[0009] Optionally, the outgoing copper busbar includes: a neutral busbar terminal, a phase terminal, a phase terminal, and a phase terminal;
[0010] One end of the zero row terminal is connected to the zero row;
[0011] One end of the phase a terminal is connected to the phase a row, one end of the phase b terminal is connected to the phase b row, and one end of the phase c terminal is connected to the phase c row.
[0012] Optionally, the low-voltage lead structure further includes an upper clamp and a low-voltage insulator;
[0013] The upper clamp is connected to the core of the transformer, and the phase bus and the neutral bus are connected to the upper clamp through the low-voltage insulator.
[0014] Optionally, a support frame may also be included;
[0015] The bracket is disposed between the low-voltage insulator and the upper clamp, with one end of the bracket connected to the upper clamp and the other end connected to one end of the low-voltage insulator.
[0016] Optionally, the other end of the zero-row terminal, the a-phase terminal, the b-phase terminal, and the c-phase terminal is connected to the other end of the low-voltage insulator.
[0017] Optionally, the low-voltage insulator has dimensions of φ50×80mm.
[0018] Optionally, the first lead insulator and the second lead insulator have the same size, φ30×30mm.
[0019] This application provides a low-voltage lead structure for a 10kV grounding transformer. By using two lead insulators to connect the phase and neutral lines of the low-voltage leads, the mechanical strength of the low-voltage leads is effectively enhanced in the event of a short circuit, reducing the additional dynamic load caused by vibration and greatly improving the short-circuit withstand capability of the grounding transformer.
[0020] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description
[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0022] Figure 1 This is a schematic diagram illustrating the low-voltage lead structure of a 10kV grounding transformer according to an exemplary embodiment;
[0023] Figure 2 This is a schematic diagram of the welding of the outgoing copper busbar of the low-voltage lead structure of a 10kV grounding transformer according to an exemplary embodiment.
[0024] In the diagram: 1. Phase C busbar; 2. Neutral busbar; 3. Phase B busbar; 4. Phase A busbar; 5. Outgoing copper busbar; 51. Neutral busbar terminal; 52. Phase A terminal; 53. Phase B terminal; 54. Phase C terminal; 6. Lead insulator; 61. First lead insulator; 62. Second lead insulator; 7. Low-voltage insulator; 8. Bracket; 9. Upper clamp; 10. Phase busbar. Detailed Implementation
[0025] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.
[0026] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0028] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0029] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.
[0030] In existing technologies, when a short circuit occurs in a grounding transformer, the current increases rapidly due to the short circuit fault, far exceeding the normal load-bearing capacity of the low-voltage copper busbar. This leads to mechanical damage such as bending and breakage. The short-circuit current also causes the low-voltage copper busbar to heat up rapidly, generating thermal stress. This thermal stress can also cause mechanical damage to the copper busbar, such as uneven expansion and contraction, thereby exacerbating the damage. Based on the above problems, this application provides a low-voltage lead structure for a 10kV grounding transformer to solve these issues.
[0031] Reference Figure 1 As shown in one embodiment of this application, a low-voltage lead structure for a 10kV grounding transformer includes: a phase busbar 10, a neutral busbar 2, and lead insulators 6.
[0032] Phase bus 10 and neutral bus 2 are connected by lead insulators 6. Phase bus 10 includes phase bus 4 (a-phase), phase bus 3 (b-phase), and phase bus 1 (c-phase). Lead insulators 6 include a first lead insulator 61 and a second lead insulator 62. Phase bus 4 (a-phase), phase bus 3 (b-phase), and phase bus 1 (c-phase) are connected to neutral bus 2 by the first lead insulator 61 and the second lead insulator 62, respectively. Phase bus 4 (a-phase), phase bus 3 (b-phase), and phase bus 1 (c-phase) correspond to phases A, B, and C of the three-phase power supply.
[0033] Specifically, a low-voltage lead structure is provided, mainly consisting of phase busbars 10, neutral busbars 2, and lead insulators 6. Phase busbars 10 include phase a busbars 4, b busbars 3, and c busbars 1. The lead insulators 6 include a first lead insulator 61 and a second lead insulator 62, connecting phase busbars 10 and neutral busbars 2. Each of the phase busbars 4, b busbars 3, and c busbars 1 is connected to the neutral busbar 2 via a first lead insulator 61 and a second lead insulator 62, effectively absorbing and buffering vibration energy and reducing potential mechanical damage from bending, breakage, etc. Phase busbars 4, b busbars 3, c busbars 1, and neutral busbars 2 correspond to the A, B, and C phase live wires and the neutral wire (zero wire) in a three-phase four-wire circuit, respectively.
[0034] In the above embodiments of this application, by setting up phase bus 10, neutral bus 2 and lead wire insulators 6, and connecting each phase bus to the neutral bus 2 through specific insulators, and setting up two lead wire insulators 6, the electrical connection and insulation isolation functions can be effectively realized, achieving reliable electrical insulation between phase bus 10 and neutral bus 2, avoiding faults such as short circuits. At the same time, if one insulator is damaged, the other insulator can continue to work, improving the safety and stability of transformer operation.
[0035] In some specific embodiments of this application, the low-voltage lead structure also includes a copper busbar 5, which is connected to the phase busbar 10 and the neutral busbar 2 by welding.
[0036] In some specific embodiments of this application, the outgoing copper busbar 5 includes: a neutral busbar terminal 51, an a-phase terminal 52, a b-phase terminal 53, and a c-phase terminal 54.
[0037] One end of the neutral terminal 51 is connected to the neutral terminal 2; one end of the a-phase terminal 52 is connected to the a-phase terminal 4; one end of the b-phase terminal 53 is connected to the b-phase terminal 3; and one end of the c-phase terminal 54 is connected to the c-phase terminal 1.
[0038] In the above embodiments of this application, by setting out copper busbars 5 in the low-voltage lead structure, including neutral busbar terminal 51, phase a terminal 52, phase b terminal 53 and phase c terminal 54, one end of neutral busbar terminal 51 is firmly connected to neutral busbar 2, one end of phase a terminal 52 is connected to phase a busbar 4, one end of phase b terminal 53 is connected to phase b busbar 3, and one end of phase c terminal 54 is connected to phase c busbar 1, all by welding. By using welding, the high strength and high reliability of the connection between each terminal and the corresponding phase busbar 10 and neutral busbar 2 are ensured, effectively reducing contact resistance, reducing power loss and heat generation, enhancing the electrical connection stability of the entire low-voltage lead structure, and improving the safety and efficiency of transformer operation.
[0039] In some specific embodiments of this application, the low-voltage lead structure also includes an upper clamp 9 and a low-voltage insulator 7.
[0040] The upper clamp 9 is connected to the transformer core, and the phase row 10 and the neutral row 2 are connected to the upper clamp 9 through the low-voltage insulator 7.
[0041] Furthermore, the low-voltage lead structure also includes a bracket 8. The bracket 8 is disposed between the low-voltage insulator 7 and the upper clamp 9, with one end of the bracket 8 connected to the upper clamp 9 and the other end connected to one end of the low-voltage insulator 7.
[0042] In some specific embodiments of this application, the other ends of the neutral phase terminal 51, the a-phase terminal 52, the b-phase terminal 53, and the c-phase terminal 54 are connected to the other end of the low-voltage insulator 7.
[0043] This application uses two lead insulators 6 to connect the phase bus 10 and the neutral bus 2 of the low-voltage lead. The outgoing copper bus 5 is connected to the phase bus 10 and the neutral bus 2 by welding. It is fixed to the upper clamp 9 by the low-voltage insulator 7 to form a whole. This effectively enhances the mechanical strength of the low-voltage lead in the event of a short circuit, reduces the additional dynamic load caused by vibration, and greatly improves its short-circuit withstand capability.
[0044] Specifically, the low-voltage insulator 7 has dimensions of φ50×80mm, that is, a diameter of 50mm and a height of 80mm. The first lead insulator 61 and the second lead insulator 62 have the same dimensions of φ30×30mm, that is, a diameter of 30mm and a height of 30mm.
[0045] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.
[0046] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.
Claims
1. A low-voltage lead structure for a 10kV grounding transformer, characterized in that, include: Phase bus, neutral bus, and lead insulators; The phase row and the neutral row are connected by the lead insulator; The phase array includes phase a, phase b, and phase c, and the lead insulator includes a first lead insulator and a second lead insulator. The phase a, phase b, and phase c are respectively connected to the zero array through the first lead insulator and the second lead insulator.
2. The low-voltage lead structure of a 10kV grounding transformer according to claim 1, characterized in that, It also includes outgoing copper busbars, which are connected to the phase busbar and the neutral busbar by welding.
3. The low-voltage lead structure of a 10kV grounding transformer according to claim 2, characterized in that, The outgoing copper busbar includes: a neutral busbar terminal, a phase terminal, a phase terminal, a phase terminal, and a c phase terminal; One end of the zero row terminal is connected to the zero row; One end of the phase a terminal is connected to the phase a row, one end of the phase b terminal is connected to the phase b row, and one end of the phase c terminal is connected to the phase c row.
4. The low-voltage lead structure of a 10kV grounding transformer according to claim 3, characterized in that, It also includes the upper clamp and low-voltage insulator; The upper clamp is connected to the core of the transformer, and the phase bus and the neutral bus are connected to the upper clamp through the low-voltage insulator.
5. The low-voltage lead structure of a 10kV grounding transformer according to claim 4, characterized in that, The low-voltage lead structure also includes a support; The bracket is disposed between the low-voltage insulator and the upper clamp, with one end of the bracket connected to the upper clamp and the other end connected to one end of the low-voltage insulator.
6. The low-voltage lead structure of a 10kV grounding transformer according to claim 4, characterized in that, The other end of the zero-row terminal, the a-phase terminal, the b-phase terminal, and the c-phase terminal is connected to the other end of the low-voltage insulator.
7. The low-voltage lead structure of a 10kV grounding transformer according to claim 4, characterized in that, The dimensions of the low-voltage insulator are φ50×80mm.
8. The low-voltage lead structure of a 10kV grounding transformer according to claim 1, characterized in that, The first lead insulator and the second lead insulator have the same dimensions, φ30×30mm.