Excitation transformer low-voltage side outgoing line commutation device

Abstract

The utility model relates to the technical field of electrical engineering, in particular to an excitation transformer low-voltage side outgoing line commutation device, which comprises an A-phase busbar, a B-phase busbar and a C-phase busbar, the A-phase busbar, the B-phase busbar and the C-phase busbar are respectively and fixedly connected with a fixing plate from bottom to top, and the B-phase busbar is horizontally arranged; one side of the A-phase busbar and one side of the C-phase busbar are fixedly connected with the fixing plate through insulating supporting columns. One side, far away from the insulating support column, of the A-phase busbar is fixedly connected with a broken busbar, and the middle part of the A-phase busbar is provided with two 90-degree bends, so that the heightening of the A-phase busbar is realized, and the wire outlet direction is changed; and four 90-degree bends are arranged in the middle of the C-phase busbar, so that the C-phase busbar is heightened and the appearance direction is changed. According to the utility model, by reasonably designing the trend and the position of the busbar, space optimization is realized, the flexibility of equipment layout is improved, and high-performance insulating materials are adopted at the bending and interrupted positions of the busbars with different phases, so that the insulating safety is ensured, and the risk of electrical faults is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering, in particular to a phase-changing device for low-voltage side outlets of an excitation transformer. Background Art

[0002] The excitation transformer is an important auxiliary equipment in the power system, mainly used to provide the DC power required for the excitation of the synchronous generator. The excitation transformer usually includes a high-voltage side and a low-voltage side, where the low-voltage side is connected to the rectifier to convert the AC power into DC power to supply the excitation winding of the generator. In the outgoing line design on the low-voltage side, it is usually required that the wires of different phases maintain a certain physical and electrical isolation to ensure the safe and stable operation of the system.

[0003] In the traditional low-voltage side outgoing line design of the excitation transformer, the busbar or wire is usually directly led out from the low-voltage side of the transformer and then connected to the rectifier. This design may have some limitations in spatial layout. For example, when the equipment layout is compact or the environmental space is limited, it may become difficult to maintain sufficient phase spacing and insulation distance. Especially when it is necessary to realize phase switching operations between different phases, the traditional direct outgoing line method may cause the crossover between busbars to be complicated, increase the insulation distance requirements, and thus increase the design difficulty and cost.

[0004] Phase commutation refers to changing the phase sequence of the busbar or conductor to meet specific electrical connection requirements. In some application scenarios, in order to optimize system performance or adapt to a specific electrical connection layout, it may be necessary to adjust the phase sequence of the low-voltage side outgoing line. However, the traditional outgoing line method faces challenges in space layout and insulation safety during phase commutation.

[0005] In order to solve the above problems, a new low-voltage side outgoing line design is needed, which can achieve effective phase sequence reversal in a limited space, while ensuring sufficient insulation spacing to avoid electrical failures. In addition, the solution should also consider the convenience of manufacturing and installation, as well as the feasibility of maintenance and repair.

[0006] Therefore, there is an urgent need to develop a low-voltage side outgoing line commutation device for an excitation transformer, which can ensure insulation safety while optimizing the spatial layout, overcome the shortcomings of the existing technology, and improve the reliability and efficiency of the entire power system.

[0007] Through the above background technology description, we provide a clear starting point for the invention content and technical solution of this utility model patent, and highlight the specific technical problems it is to solve.

[0008] Therefore, a phase-changing device for the low-voltage side output line of the excitation transformer is designed to effectively solve the above problems. Utility Model Content

[0009] Aiming at the shortcomings of the prior art, a phase-changing device for low-voltage side outgoing line of an excitation transformer is designed.

[0010] The utility model solves the technical problem by adopting a technical solution: a low-voltage side outgoing line phase-changing device for an excitation transformer, comprising an A-phase busbar (1), a B-phase busbar (2), and a C-phase busbar (3), wherein the A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are respectively fixedly connected to a fixing plate (4) from bottom to top, wherein the B-phase busbar (2) is placed horizontally; one side of the A-phase busbar (1) and the C-phase busbar (3) are both fixedly connected to the fixing plate (4) via an insulating support column (6); a disconnect busbar (5) is fixedly connected to the side of the A-phase busbar (1) away from the insulating support column (6), and two 90-degree bends are arranged in the middle of the A-phase busbar (1) to achieve the heightening of the A-phase busbar (1) and change of the outgoing line direction; and four 90-degree bends are arranged in the middle of the C-phase busbar (3) to achieve the heightening of the C-phase busbar (3) and change of the outgoing line direction.

[0011] Preferably, the A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are all two-layer steel plate structures, and clamping blocks are provided at both ends of the A-phase busbar (1), the B-phase busbar (2) and one side of the C-phase busbar (3), and a plurality of bolts and nuts are provided for spiral connection.

[0012] Preferably, the disconnected busbar (5) is fixedly connected to the A-phase busbar (1) using insulating material to ensure a sufficient insulation distance.

[0013] Preferably, the insulating support column (6) has sufficient mechanical strength to withstand the weight of the A-phase busbar (1) and the C-phase busbar (3) and the stress caused by thermal expansion.

[0014] Preferably, the bends and discontinuities of the A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are all coated with high-performance insulating materials.

[0015] Beneficial effects of the utility model:

[0016] 1. Space optimization: The utility model reasonably designs the direction and position of the busbar and uses the space difference to achieve the height adjustment of phase A and phase C, effectively solving the phase change demand that is difficult to meet in the traditional outlet mode due to space limitations. This design enables the busbar to be changed smoothly in a compact space, improving the flexibility of equipment layout.

[0017] 2. Maintain insulation safety: At the bends and discontinuities of the busbars of different phases, high-performance insulation materials and technologies are used to ensure that the insulation distance meets electrical safety standards. This ensures system safety and avoids the risk of electrical failure even when phase switching is achieved.

[0018] 3. Simplified structure: Compared with the traditional complex cross design, the utility model realizes phase change by direct bending and intermittent busbars, which simplifies the structure. This simplification not only reduces the difficulty of manufacturing and installation, but also facilitates future maintenance and repair work.

[0019] 4. Cost-effectiveness: Due to the simplification of the structure and the optimization of the manufacturing process, the utility model reduces the material usage and labor costs, and has high economic benefits. At the same time, the simple structure also reduces potential failure points, further reducing operation and maintenance costs.

[0020] 5. Improve reliability: The utility model reduces the possibility of uneven force and fatigue damage to the busbar by reducing busbar crossing and complex bending, thereby improving the long-term reliability of the system.

[0021] 6. Convenient installation: All busbar processing (cutting, bending, etc.) is completed in the factory, ensuring processing accuracy and quality. On-site installation uses standardized bolt fixing and insulation support, which simplifies the installation process and shortens the installation time.

[0022] 7. Environmental adaptability: Since the design of the utility model takes into account different installation environments and space constraints, it has better adaptability and can be used in a variety of different power system layouts, increasing its market potential and scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a front view of the overall structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the connection point A between the A-phase busbar and the disconnected busbar of the utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the bending structure of the C-phase busbar part and the connection B with the insulating support column of the utility model.

[0028] In the figure: 1. A-phase busbar; 2. B-phase busbar; 3. C-phase busbar; 4. Fixed plate; 5. Broken busbar; 6. Insulating support column. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods. Example

[0030] like Figure 1-Figure 4 As shown, the utility model discloses a phase-changing device for the low-voltage side outgoing line of an excitation transformer, comprising an A-phase busbar 1, a B-phase busbar 2, and a C-phase busbar 3, wherein the A-phase busbar 1, the B-phase busbar 2, and the C-phase busbar 3 are respectively fixedly connected to a fixing plate 4 from bottom to top, wherein the B-phase busbar 2 is placed horizontally; one side of the A-phase busbar 1 and the C-phase busbar 3 are fixedly connected to the fixing plate 4 through an insulating support column 6; the A-phase busbar 1 is fixedly connected to a broken busbar 5 on the side away from the insulating support column 6, and two 90-degree bends are arranged in the middle of the A-phase busbar 1 to realize the heightening of the A-phase busbar 1 and change the outgoing line direction; the C-phase busbar 3 is provided with four 90-degree bends in the middle to realize the heightening of the C-phase busbar 3 and change the direction of appearance. The spatial position and outgoing line direction of the busbar are adjusted by designing a specific structure, thereby meeting the commutation requirements of the outgoing line on the low-voltage side of the transformer. Specifically, the disconnecting busbar 5 is used to form an electrical isolation point on the A-phase busbar 1, so that the current can be easily cut off during maintenance or inspection. The insulating support column 6 ensures the electrical insulation between the A-phase busbar 1 and the C-phase busbar 3 and the fixed plate 4, while also providing stable mechanical support. The multiple bends in the middle of the A-phase busbar 1 and the C-phase busbar 3 not only increase the height of the busbar to adapt to different wiring height requirements, but also change the direction of its outgoing line, so that the device can be flexibly applied to different transformer wiring methods and spatial layouts. Through this design, the device can efficiently complete the phase change function while maintaining the compactness and safety of the system.

[0031] Specifically, the A-phase busbar 1, the B-phase busbar 2, and the C-phase busbar 3 are all two-layer steel plate structures, and clamps are provided at both ends of the A-phase busbar 1 and the B-phase busbar 2 and one side of the C-phase busbar 3, and multiple bolts and nuts are provided for spiral connection. The A-phase busbar 1, the B-phase busbar 2, and the C-phase busbar 3 with two-layer steel plate structures are used for stable electrical connection, and the firmness and reliability of the connection are ensured by the spiral connection method of the clamps and the bolts and nuts. The two-layer steel plate structure provides sufficient mechanical strength to withstand the heat and electromagnetic force generated by the current, and also facilitates heat dissipation. The clamps are designed to fix and align the busbars, while the bolts and nuts are used to tighten the clamps to ensure that the busbars will not loosen due to vibration or thermal expansion and contraction during long-term operation. This connection method not only improves the electrical performance of the device, but also simplifies the installation and maintenance work, so that it can be quickly disassembled and replaced when necessary, thereby improving the maintainability and reliability of the system.

[0032] Specifically, the disconnected busbar 5 is fixedly connected to the A-phase busbar 1 using insulating materials to ensure sufficient insulation distance. The application of the disconnected busbar 5 is to be able to safely isolate the current during maintenance or overhaul. The disconnected busbar 5 is made of insulating material and is fixedly connected to the A-phase busbar 1. The purpose of this design is to ensure that there is sufficient insulation distance between the busbars and between the busbar and the grounding part to prevent arcing or electrical short circuits. The selection of insulating materials is usually based on their excellent electrical insulation properties and mechanical strength to withstand the mechanical stress and electrical loads that may occur in daily operations. In this way, the device including the disconnected busbar 5 and the A-phase busbar 1 can achieve controllable disconnection and closing of the circuit while ensuring safety, meeting the operating requirements of the power system.

[0033] Specifically, the insulating support column 6 has sufficient mechanical strength to withstand the weight of the A-phase busbar 1 and the C-phase busbar 3 and the stress caused by thermal expansion. The insulating support column 6 is designed to provide sufficient mechanical support and insulation function to withstand the weight of the A-phase busbar 1 and the C-phase busbar 3 and the stress caused by thermal expansion. The insulating support column 6 is usually made of materials with high mechanical strength and excellent insulation properties, such as glass fiber reinforced plastic or composite insulation material. Such a design can ensure that during the operation of the transformer, the mechanical stress caused by the weight and temperature changes of the A-phase busbar 1 and the C-phase busbar 3 can be effectively dispersed and borne, while ensuring electrical insulation safety. Through the reasonable design and application of the insulating support column 6, the device can stably support and fix the A-phase busbar 1 and the C-phase busbar 3, while ensuring electrical isolation between them and the fixing plate 4, thereby ensuring the reliability and safety of the device.

[0034] Specifically, the bends and discontinuities of the A-phase busbar 1, the B-phase busbar 2, and the C-phase busbar 3 are all coated with high-performance insulating materials. The working principle of the device involves ensuring electrical isolation between the busbars of each phase and from other conductive parts, thereby providing safe and reliable power transmission. The A-phase busbar 1, the B-phase busbar 2, and the C-phase busbar 3 are coated with high-performance insulating materials at the bends and discontinuities to prevent these areas prone to electrical stress concentration from becoming potential points of insulation failure. High-performance insulating materials can resist phenomena such as arcs and corona discharges, and maintain their insulation properties without degradation during long-term operation. In addition, the coating of insulating materials also helps prevent busbar fatigue caused by temperature changes and mechanical vibrations, thereby extending the service life of the device. Through this design, the device can maintain efficient power transmission under various operating conditions, while minimizing failures and maintenance requirements, ensuring the overall stability and safety of the system.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "vertical", "top", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A low-voltage side outgoing line commutation device for an excitation transformer, comprising an A-phase busbar (1), a B-phase busbar (2), and a C-phase busbar (3), characterized in that: The A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are respectively fixedly connected to the fixing plate (4) from bottom to top, wherein the B-phase busbar (2) is placed horizontally; one side of the A-phase busbar (1) and the C-phase busbar (3) are fixedly connected to the fixing plate (4) via an insulating support column (6); a disconnect busbar (5) is fixedly connected to the side of the A-phase busbar (1) away from the insulating support column (6), and two 90-degree bends are arranged in the middle of the A-phase busbar (1) to increase the height of the A-phase busbar (1) and change the direction of the outgoing line; and four 90-degree bends are arranged in the middle of the C-phase busbar (3) to increase the height of the C-phase busbar (3) and change the direction of the outgoing line.

2. According to claim 1, a phase-changing device for low-voltage side outlet of an excitation transformer, characterized in that: The A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are all two-layer steel plate structures, and clamping blocks are provided at both ends of the A-phase busbar (1) and the B-phase busbar (2) and at one side of the C-phase busbar (3), and are provided with a plurality of bolts and nuts for spiral connection.

3. According to claim 1, a low-voltage side outgoing line commutation device for excitation transformer, characterized in that: The disconnected busbar (5) is fixedly connected to the A-phase busbar (1) using insulating material to ensure a sufficient insulation distance.

4. The low voltage side outgoing line commutation device of the excitation transformer according to claim 1 is characterized in that: The insulating support column (6) has sufficient mechanical strength to withstand the weight of the A-phase busbar (1) and the C-phase busbar (3) and the stress caused by thermal expansion.

5. The low voltage side outgoing line commutation device of the excitation transformer according to claim 1 is characterized in that: The bends and discontinuities of the A-phase busbar (1), the B-phase busbar (2), and the C-phase busbar (3) are all coated with high-performance insulating materials.

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