35kV transformer, electric reactor short circuit resistant low voltage lead structure

Abstract

The application provides a 35kV transformer, a low-voltage lead structure of a short-circuit-resistant electric reactor, comprising: a wiring copper bar, a zero-phase copper bar and a lead insulation part; the zero-phase copper bar is located below the wiring copper bar, the lead insulation part is arranged between the wiring copper bar and the zero-phase copper bar and is used for connecting the wiring copper bar and the zero-phase copper bar; the lead insulation part is provided with two insulators; the wiring copper bar comprises: an a-phase copper bar, a b-phase copper bar and a c-phase copper bar, and the zero-phase copper bar is detachably connected with the a-phase copper bar, the b-phase copper bar and the c-phase copper bar through the insulators. The wiring copper bar and the zero-phase copper bar are fixed through the double insulators, the stability of the low-voltage winding and the core is enhanced, the creepage distance is increased through the double insulators, the risk of electrical breakdown is reduced, when one of the insulators fails, the other insulator can still support the conductor, the system is prevented from being completely disabled, the short-circuit-resistant requirement is achieved, the phase bar is bent and formed into an outlet, welding is avoided, and the reliability is high.

Description

Technical Field

[0001] This application relates to the field of power transformers, specifically to a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor. Background Technology

[0002] The low-voltage leads of a transformer are critical components connecting the low-voltage windings to external circuits in a power transformer. Their design and structure are essential for the transformer's performance and safe operation. Sudden short circuits are a serious fault that can occur during product operation. During a short circuit, the low-voltage lead structure is easily damaged, leading to equipment failure or power outages.

[0003] When a short-circuit fault occurs in a conventional 35kV transformer or reactor, a huge current is generated inside the winding, which produces a strong electromagnetic force. This may cause deformation of the product structure, such as twisting of the coil winding and displacement of the iron core. At the same time, the electromagnetic force is converted into mechanical force, and the coil winding is subjected to axial and radial forces, causing impacts on the overall structure of the product in different directions and affecting the stability of the low-voltage leads. 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 short-circuit protection of 35kV transformers and reactors.

[0005] The first aspect of this application provides a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor, comprising: a connecting copper busbar, a zero-phase copper busbar, and lead insulation.

[0006] The zero-phase copper busbar is located below the terminal copper busbar, and the lead insulation part is disposed between the terminal copper busbar and the zero-phase copper busbar for connecting the terminal copper busbar and the zero-phase copper busbar;

[0007] The lead wire insulation section is provided with two insulators; the connecting copper busbar includes: phase a copper busbar, phase b copper busbar and phase c copper busbar, and the zero phase copper busbar is detachably connected to phase a copper busbar, phase b copper busbar and phase c copper busbar respectively through the insulators.

[0008] Optionally, the lead insulation portion includes a first insulation portion, a second insulation portion, and a third insulation portion;

[0009] The phase a copper busbar and the zero phase copper busbar are detachably connected through the first insulating part;

[0010] The b-phase copper busbar and the zero-phase copper busbar are detachably connected via the second insulating part;

[0011] The c-phase copper busbar and the zero-phase copper busbar are detachably connected via the third insulating part;

[0012] The first insulating part, the second insulating part, and the third insulating part are each provided with two insulators.

[0013] Optionally, it also includes an upper clamp, which is connected to the core of the transformer or reactor, for fixing the terminal copper busbar and the zero-phase copper busbar.

[0014] Optionally, the low-voltage lead structure further includes a low-voltage insulation portion;

[0015] The zero-phase copper busbar, the a-phase copper busbar, the b-phase copper busbar, and the c-phase copper busbar are detachably connected to the upper clamp via the low-voltage insulation part.

[0016] Optionally, it also includes a copper busbar lead wire, one end of which is connected to the zero-phase copper busbar, and the other end of which is connected to the low-voltage insulation part.

[0017] Optionally, the low-voltage lead structure further includes: a coil lead wire, which is connected to the a-phase copper busbar, the b-phase copper busbar and the c-phase copper busbar by welding.

[0018] This application provides a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor, which uses two lead insulators for fixing, thereby enhancing the stability of the low-voltage winding and core. The use of double insulators increases the creepage distance, thereby reducing the risk of electrical breakdown and improving the reliability of the entire power system. When one insulator fails, the other insulator can still continue to support the conductor, preventing complete system failure.

[0019] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the lead assembly of a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to an exemplary embodiment.

[0022] Figure 2 This is a schematic diagram of another angle of lead assembly for a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to an exemplary embodiment.

[0023] In the diagram: 1. Phase C copper busbar; 2. Phase B copper busbar; 3. Copper busbar lead wire; 5. Zero phase copper busbar; 4. Phase A copper busbar; 6. Lead wire insulation part; 61. Insulator; 62. First insulation part; 63. Second insulation part; 64. Third insulation part; 7. Upper clamp; 8. Low voltage insulation part; 9. Coil lead wire; 10. Coil; 11. Connecting copper busbar. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] When a short-circuit fault occurs in a 35kV transformer or reactor, a huge current is generated inside the winding, resulting in a strong electromagnetic force. This can cause structural deformation, such as twisting of the coil windings or displacement of the core. Simultaneously, the electromagnetic force is converted into mechanical force, subjecting the coil windings to axial and radial forces, causing impacts on the overall structure of the product in different directions and affecting the stability of the low-voltage leads. Based on these problems, this application provides a short-circuit resistant low-voltage lead structure for 35kV transformers and reactors to address these issues.

[0030] Reference Figure 1 As shown, in one embodiment of this application, a low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor includes: a connecting copper busbar 11, a zero-phase copper busbar 5, and a lead insulation part 6.

[0031] The zero-phase copper busbar 5 is located below the connecting copper busbar 11. The lead wire insulation part 6 is disposed between the connecting copper busbar 11 and the zero-phase copper busbar 5, and is used to connect the connecting copper busbar 11 and the zero-phase copper busbar 5. The lead wire insulation part 6 is provided with two insulators 61. The connecting copper busbar 11 includes: a-phase copper busbar 4, b-phase copper busbar 2 and c-phase copper busbar 1. The zero-phase copper busbar 5 is detachably connected to a-phase copper busbar 4, b-phase copper busbar 2 and c-phase copper busbar 1 respectively through insulators 61.

[0032] Specifically, phase busbar 4 (a-phase), phase busbar 2 (b-phase), phase busbar 1 (c-phase), and neutral busbar 5 (zero-phase) correspond to the connecting copper busbars for the three-phase live wires (A, B, and C) and the neutral wire (zero line) in a three-phase four-wire circuit. By including phase busbar 4 (a-phase), phase busbar 2 (b-phase), phase busbar 1 (c-phase), and neutral busbar 5 in the low-voltage lead structure of the transformer and reactor, the connecting copper busbar 11 and the lower neutral busbar 5 are supported and fixed by two insulators 61. The leads are then led out from the connecting copper busbar 11 and fixed by double insulators 61, achieving coil stability, improving the product's short-circuit withstand capability, avoiding welding, simplifying the manufacturing process, increasing reliability, and offering advantages over conventional structures such as support stability, ease of assembly, and good short-circuit stability.

[0033] In the above embodiments of this application, the copper busbar 11 is connected by two insulators 61, which enhances the stability of the low-voltage winding and the core. The use of double insulators 61 increases the creepage distance, thereby reducing the risk of electrical breakdown and improving the reliability of the entire power system. When a 35kV transformer / reactor experiences a sudden short circuit on the low-voltage side, if one insulator 61 fails, the other insulator 61 can still continue to support the conductor, preventing complete system failure and improving safety.

[0034] In some specific embodiments, the lead insulation portion 6 includes a first insulation portion 62, a second insulation portion 63, and a third insulation portion 64.

[0035] Phase a copper busbar 4 and zero phase copper busbar 5 are detachably connected via a first insulating part 62; phase b copper busbar 2 and zero phase copper busbar 5 are detachably connected via a second insulating part 63; phase c copper busbar 1 and zero phase copper busbar 5 are detachably connected via a third insulating part 64; each of the first insulating part 62, the second insulating part 63 and the third insulating part 64 is provided with two insulators 61.

[0036] In the above embodiments of this application, the zero-phase copper busbar 5 is detachably connected to the a-phase copper busbar 4, the b-phase copper busbar 2, and the c-phase copper busbar 1 through the first insulating part 62, the second insulating part 63, and the third insulating part 64 of the lead wire insulating part 6. At the same time, two insulators 61 are provided in the first insulating part 62, the second insulating part 63, and the third insulating part 64, so that if one insulator 61 is accidentally damaged, the other insulator 61 can still fix the lead wire structure normally, thereby improving safety.

[0037] In some specific implementations, the low-voltage lead structure also includes an upper clamp 7, which is connected to the core of the transformer and reactor to fix the copper busbar 11 and the zero-phase copper busbar 5.

[0038] During operation, the transformer generates electromagnetic forces and vibrations. The upper clamp 7, together with the low-voltage lead structure, forms a rigid frame, enhancing the overall strength and rigidity of the transformer, resisting forces, preventing deformation of the overall transformer structure, and ensuring safe and stable operation. During transportation and installation, the upper clamp 7 provides reliable support and protection for the core and coil 10, preventing damage to internal components due to external impacts and ensuring structural strength and stability.

[0039] In some specific embodiments, the low-voltage lead structure also includes a low-voltage insulation part 8, and the zero-phase copper busbar 5, a-phase copper busbar 4, b-phase copper busbar 2 and c-phase copper busbar 1 are detachably connected to the upper clamp 7 through the low-voltage insulation part 8.

[0040] Specifically, the a-phase copper busbar 4, b-phase copper busbar 2, c-phase copper busbar 1 and zero-phase copper busbar 5 of the wiring copper busbar 11 are detachably connected to the upper clamp 7 through the low-voltage insulation part 8, which can better support the coil.

[0041] In some specific embodiments, the low-voltage lead structure also includes a copper busbar lead 3, one end of which is connected to the zero-phase copper busbar 5, and the other end of which is connected to the low-voltage insulation part 8.

[0042] In some specific implementations, the low-voltage lead structure further includes: coil lead wire 9, which is connected to phase a copper busbar 4, phase b copper busbar 2 and phase c copper busbar 1 by welding.

[0043] Specifically, an external connecting wire, namely coil lead wire 9, is drawn from the coil 10 of the transformer or reactor. The coil lead wire 9 is connected to the a-phase copper busbar 4, the b-phase copper busbar 2 and the c-phase copper busbar 1 by welding to achieve the connection.

[0044] Compared with conventional 35kV transformer / reactor structures, the embodiments described in this application exhibit superior stability due to the low-voltage lead assembly. During short-circuit faults, the windings generate significant axial forces, making the terminals less prone to deformation under stress. The double insulator 61 connection provides enhanced support stability, effectively resisting the effects of external factors such as wind and vibration, ensuring conductor stability during operation. It features simple assembly, high reliability, and significantly improves the product's ability to withstand sudden short-circuit anomalies during operation, ensuring safe and stable equipment operation. This also helps reduce maintenance costs and improve maintenance efficiency, ensuring the long-term stable operation of the power system.

[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 short-circuit protection of a 35kV transformer and reactor, characterized in that, include: Terminal copper busbar, neutral phase copper busbar, and lead wire insulation; The zero-phase copper busbar is located below the terminal copper busbar, and the lead insulation part is disposed between the terminal copper busbar and the zero-phase copper busbar for connecting the terminal copper busbar and the zero-phase copper busbar; The lead wire insulation section is provided with two insulators, and the connecting copper busbar includes: phase a copper busbar, phase b copper busbar and phase c copper busbar. The zero phase copper busbar is detachably connected to phase a copper busbar, phase b copper busbar and phase c copper busbar respectively through the insulator.

2. The low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to claim 1, characterized in that, The lead insulation portion includes a first insulation portion, a second insulation portion, and a third insulation portion; The phase a copper busbar and the zero phase copper busbar are detachably connected through the first insulating part; The b-phase copper busbar and the zero-phase copper busbar are detachably connected via the second insulating part; The c-phase copper busbar and the zero-phase copper busbar are detachably connected via the third insulating part; The first insulating part, the second insulating part, and the third insulating part are each provided with two insulators.

3. The low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to claim 1, characterized in that, It also includes an upper clamp, which is connected to the transformer core and is used to fix the terminal copper busbar and the zero-phase copper busbar.

4. The low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to claim 3, characterized in that, It also includes a low-voltage insulation section, wherein the zero-phase copper busbar, the a-phase copper busbar, the b-phase copper busbar, and the c-phase copper busbar are detachably connected to the upper clamp via the low-voltage insulation section.

5. The low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to claim 4, characterized in that, It also includes copper busbar leads, one end of which is connected to the zero-phase copper busbar, and the other end of which is connected to the low-voltage insulation part.

6. The low-voltage lead structure for short-circuit protection of a 35kV transformer and reactor according to claim 1, characterized in that, It also includes coil leads, which are connected to the a-phase copper busbar, the b-phase copper busbar and the c-phase copper busbar by welding.

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