A built-in series reactor device of a riser seat and a single-phase transformer and a three-phase transformer

Abstract

The utility model discloses a kind of built-in series reactor devices of elevated seat, belong to transformer field, including series reactor body, series reactor installation bottom plate and elevated seat installation bottom plate, series reactor body is arranged in the inside of elevated seat, elevated seat installation bottom plate is arranged on the inner wall of elevated seat, series reactor body is installed on series reactor installation bottom plate, series reactor installation bottom plate is installed on elevated seat installation bottom plate, series reactor body includes series reactor outlet structure, the outgoing line end of series reactor outlet structure is led out elevated seat by bushing, the coil connection end of series reactor outlet structure is led out along the inner diameter side of elevated seat, and the coil connection end of series reactor outlet structure is connected with transformer coil.This device innovatively uses built-in layout of elevated seat, can be flexibly installed in transformer oil tank wall or tank cover, significantly reduce the overall volume of transformer, save transformer oil consumption and outlet space.The utility model also discloses single-phase transformer of installing built-in series reactor device of elevated seat, three-phase transformer.

Description

Technical Field

[0001] This utility model belongs to the field of transformers, specifically relating to a device for a riser base with a built-in series reactor, as well as a single-phase transformer and a three-phase transformer. Background Technology

[0002] With the continuous growth of the power grid, the system capacity is bound to increase, load density will rise steadily, and the short-circuit current level of the power system will rise sharply, seriously threatening the operational safety of power transformers and the power system. Increasing the impedance of transformers is an economical, convenient, and effective method for controlling short-circuit current, and it has been widely used in power systems. In recent years, the proportion of medium- and high-impedance transformers has been increasing year by year, and the application of high-impedance transformers has become a trend.

[0003] Conventionally, high impedance is achieved by adjusting the winding arrangement and coil size. However, this is not economical for high impedance, resulting in large transformer coil size (more and more expensive copper) and large overall transformer volume (steel plates, transformer oil). When the low-voltage capacity is low, its impedance to high and medium voltage may exceed 100%. Using a series reactor in the low-voltage winding, i.e., adding a reactor in the delta-connected winding loop, is a more flexible and low-cost method.

[0004] The common practice for achieving high impedance in transformers using series reactor structures is to place the series reactor inside the transformer. This requires a dedicated space within the transformer body and outgoing lines, while also meeting insulation distance and lead layout requirements. Generally, an internal series reactor increases the length or width of the transformer tank by 10%-30%. Even with smaller low-voltage coil capacities, the series reactor, though small in size, still occupies considerable internal tank space, increasing the transformer's overall size and wasting transformer oil. Furthermore, for impedance retrofitting projects on existing transformers, traditional external or internal series reactor methods often require significant modifications to the transformer tank, resulting in complex construction, long construction periods, and disruptions to the normal operation of the power system.

[0005] For example, the Chinese utility model patent CN216054135U discloses a three-phase series reactor with an external pressure-resistant structure. The proposed three-phase series reactor adopts an external pressure-resistant structure design. Although the pressure resistance performance is optimized, it still relies on the space of the transformer tank. In some scenarios, the tank structure even needs to be adapted. Not only does it fail to avoid the core problem of "space occupation" of traditional series reactors, but the additional layout requirements of the external structure may lead to a further increase in the overall volume occupied by the transformer, and the defect of low equipment space utilization still exists. For example, the Chinese utility model patent CN209029198U discloses a three-phase series reactor with an external anti-pressure structure. This design also revolves around an external anti-pressure structure for the three-phase series reactor. During installation, commissioning, and subsequent maintenance, this solution requires frequent disassembly and assembly of the series reactor and its associated wiring. On the one hand, this significantly increases the complexity and cost of operation and maintenance. On the other hand, structural disturbances during disassembly and assembly can damage the sealing performance, or repeated operations can lead to a decrease in wiring reliability, directly affecting the stability and long-term reliability of the transformer. Furthermore, it does not provide an effective solution to address the core need of reducing equipment size and space occupation.

[0006] Therefore, it is urgent to solve the problem that the installation of series reactors occupies the internal space of the oil tank, resulting in increased transformer size, waste of transformer oil, and poor adaptability to modification. Utility Model Content

[0007] The purpose of this invention is to overcome the problem that series reactors, despite their small size, still occupy a certain amount of internal space in the oil tank, resulting in an increase in transformer volume and waste of transformer oil. This invention proposes a device for a series reactor built into a riser base.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a device for a series reactor built into a riser base, comprising a series reactor body, a series reactor mounting base plate, and a riser base mounting base plate. The series reactor body is disposed inside the riser base, and the riser base mounting base plate is disposed on the inner wall of the riser base. The series reactor body is mounted on the series reactor mounting base plate, and the series reactor mounting base plate is mounted on the riser base mounting base plate. The series reactor body includes a series reactor lead-out structure. The lead-out end of the series reactor lead-out structure is led out of the riser base through a sleeve. The coil terminal of the series reactor lead-out structure is led out along the inner diameter side of the riser base, and the coil terminal of the series reactor lead-out structure is connected to the transformer coil.

[0009] Furthermore, the series reactor body includes a pull rod, a pressure plate, a coil, and a reactor mounting structure. Several pull rods are arranged around the coil, and pressure plates are provided at both ends of the coil. The pull rods are installed through the pressure plates. The reactor mounting structure is installed on the pressure plate at one end of the coil. The reactor mounting structure is installed on the side of the series reactor mounting base away from the riser mounting base.

[0010] Furthermore, the mounting base plate of the series reactor is provided with through holes.

[0011] Furthermore, the coil terminals of the series reactor output structure are connected to the coil via through holes.

[0012] Furthermore, the riser seat is made of non-magnetic steel, and the base plate of the riser seat is made of structural steel.

[0013] Furthermore, the mounting base plate for the series reactor is made of laminated wood.

[0014] Furthermore, the riser is installed on the tank wall or the tank cover.

[0015] Furthermore, one or three series reactor bodies are provided. When three are provided, the three series reactor bodies are integrated into the same riser in a star or delta connection layout.

[0016] Secondly, this utility model provides a single-phase transformer with a built-in series reactor device installed on a riser base, and one series reactor is installed on the main body of the series reactor.

[0017] Thirdly, this utility model provides a three-phase transformer with a built-in series reactor device in a riser base. Three series reactor bodies are arranged in a star or delta connection within the same riser base.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a device for integrating a series reactor within a riser base. The series reactor is arranged within the riser base and is suitable for single-phase or three-phase series reactors. It can be installed on the tank wall or cover, achieving the goals of not occupying internal tank space, reducing tank volume, saving transformer oil, and facilitating outgoing lines. This invention integrates the series reactor body inside the riser base, eliminating the need to occupy effective internal space in the transformer tank and avoiding the increased tank volume problem caused by traditional built-in series reactors. It also saves a corresponding proportion of transformer oil consumption, reducing equipment manufacturing and transportation costs. Furthermore, it is applicable to retrofit projects where a series reactor is added to adjust transformer impedance. For impedance retrofit projects of existing transformers, there is no need for significant cutting or reconstruction of the original tank; impedance adjustment can be achieved simply by installing this device. The construction is simple, the cycle is short, significantly reducing retrofit costs and minimizing the impact on the normal operation of the power system. Without altering or replacing the original transformer coils, the existing coil structure and performance can be fully reused. Traditional impedance adjustment schemes not only involve costly coil modifications, requiring significant expenses for coil redesign, manufacturing, and overall equipment reconstruction, but also risk rendering core components unusable. This invention, through the innovative design of an external series reactor, completely avoids this cost bottleneck, significantly reducing component replacement costs and technical risks. Achieving high transformer impedance using a series reactor structure requires a dedicated transformer body location and outgoing line space, while also meeting insulation distance and lead layout requirements. The series reactor outgoing line structure employs an inner diameter side lead-out and bushing exit method, shortening the wiring path, reducing lead space occupation, and lowering the difficulty of insulation design for lead layout. Insulation sealing at connection points ensures electrical safety and prevents transformer oil leakage, improving the operational safety and sealing of the device. Through structural innovation, the reactor and riser are integrated, optimizing space utilization, reducing costs, and improving adaptability while ensuring impedance adjustment functionality.

[0019] Furthermore, for the later-stage expansion and renovation of substations, transformer impedance adjustment can be completed at a lower cost. Using this invention, the renovation cost is significantly reduced. This invention maximizes the reuse of the original transformer core, coils, body, tank, external components, and leads, eliminating the need for disassembly, replacement, or reconstruction of these key components. Only a few additional components, namely reactors and riser mounts, are required, avoiding the high costs associated with modifying the core structure or remanufacturing the entire equipment in traditional renovations. The renovation process is greatly simplified; only a reactor needs to be connected in series at the beginning and end of the target winding, and a riser mount welded to the tank wall or cover before installing the series reactor. This allows for rapid completion of the renovation without complex core structure adjustments or internal construction. This invention significantly shortens the construction cycle and reduces construction difficulty; it offers flexible and wider impedance adjustment, overcoming the limitations of traditional coil modification which struggles to achieve large-scale impedance adjustment. By using an external series reactor, it can flexibly adapt to the actual impedance requirements of expansion and renovation, with the adjustment range unrestricted by the original transformer structure. Equipment utilization is greatly improved, eliminating the need to discard core transformer components and avoiding the resource waste caused by complete remanufacturing in traditional modifications. It perfectly meets the economic, convenient, and flexible requirements of substation expansion for equipment modification, possessing strong engineering practicality and promotional value.

[0020] Furthermore, this invention breaks through the traditional layout by changing the arrangement and installation position of the series reactor, integrating it into the transformer riser. This directly solves the problem of traditional series reactors occupying tank space and increasing transformer size, achieving the goal of equipment miniaturization. This invention features an integrated design within the transformer; after installation, it only needs to be returned to the factory for major maintenance needs or component damage. No disassembly or assembly is required during daily operation, unlike traditional methods that involve frequent disassembly and assembly, further ensuring the stability and reliability of transformer operation. Attached Figure Description

[0021] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components of the present invention.

[0022] In the attached diagram: Figure 1 This is a schematic diagram of a riser seat with a built-in series reactor according to the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of a three-phase integrated riser seat with built-in series reactor according to this utility model.

[0024] Figure 3 This is a detailed structural diagram of the series reactor body.

[0025] Figure 4 This is a three-dimensional structural diagram of the series reactor body.

[0026] Figure 5 This is a schematic diagram showing the connection between a transformer and a series reactor in one phase.

[0027] Figure 6 This is a schematic diagram of a single-phase setup for a riser housing with a built-in series reactor.

[0028] Figure 7 This is a schematic diagram of a three-phase setup for a riser housing with a built-in series reactor.

[0029] Among them, 1 is the transformer lead, 2 is the series reactor body, 3 is the riser base, 4 is the tie rod, 5 is the pressure plate, 6 is the coil, 7 is the reactor mounting structure, 8 is the series reactor mounting base plate, and 9 is the riser base plate. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0031] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Example 1 See Figure 1 A series reactor device with a built-in riser base includes a series reactor body, a series reactor mounting base plate 8, and a riser base mounting base plate 9. The series reactor body is disposed inside the riser base, the riser base mounting base plate is disposed on the inner wall of the riser base, the series reactor body is mounted on the series reactor mounting base plate 8, and the series reactor mounting base plate 8 is mounted on the riser base mounting base plate 9. The series reactor body includes a series reactor lead-out structure 1, the lead-out end of which is led out of the riser base through a bushing. The coil terminal of the series reactor lead-out structure 1 is led out along the inner diameter side of the riser base and is connected to the transformer coil.

[0035] The series reactor body includes a pull rod 4, a pressure plate 5, a coil 6, and a reactor mounting structure 7. Several pull rods 4 are arranged around the coil 6. Pressure plates 5 are provided at both ends of the coil 6. The pull rods 4 are installed through the pressure plates 5. The reactor mounting structure 7 is installed on the pressure plate 5 at one end of the coil 6. The reactor mounting structure 7 is installed on the side of the series reactor mounting base plate 8 away from the riser mounting base plate 9.

[0036] This embodiment integrates the series reactor body inside the riser mount, eliminating the need for additional external space and significantly optimizing the overall compactness of the power equipment layout. It is particularly suitable for space-constrained scenarios such as substations and switchgear, effectively improving site utilization. The riser mount provides excellent enclosure and protection for the reactor body. Traditionally, reactors are placed inside transformers, but this embodiment places the reactor within the riser mount, eliminating the need for transformer space, thus reducing transformer size, extending equipment lifespan, and decreasing the probability of failure. The double-layer fixing structure of the series reactor mounting base plate and the riser mount mounting base plate ensures a secure installation of the reactor within the riser mount, resulting in less vibration during operation and preventing component loosening or performance fluctuations caused by vibration. The integrated installation design simplifies the equipment assembly process, eliminating the need for complex disassembly and relocation of the reactor during later maintenance, reducing the workload and difficulty of operation and maintenance. Simultaneously, the built-in structure reduces electromagnetic interference between the reactor and external equipment, improving the overall reliability of the power system and resulting in significant comprehensive benefits. The lead-out terminals of the series reactor's outgoing line structure 1 are led out to the riser base via bushings, significantly improving the insulation level of the outgoing lines and effectively avoiding the risks of leakage and discharge under high-voltage conditions, thus ensuring the safe operation of the power system. Furthermore, the inner diameter-side lead-out method saves radial space in the reactor, further optimizing the compactness of the internal layout of the riser base. Combined with the stability of the double-layer mounting base, this ensures that the wiring connections remain reliable even under vibration, comprehensively improving the safety and reliability of the equipment operation.

[0037] The mounting base plate 8 of the series reactor is provided with a through hole, and the coil terminal of the output structure 1 of the series reactor passes through the through hole and is connected to the coil.

[0038] In this embodiment, the coil terminals are led out from the inner diameter side and pass through the through-hole in the series reactor mounting base plate 8 to connect with the coil. This layout makes the wiring path more reasonable, reduces the exposed area of ​​the terminals, and reduces the impact of external interference on the circuit connection. The through-hole ensures smooth oil flow inside the transformer and provides sufficient heat dissipation for the series reactor. At the same time, the through-hole design provides precise positioning for the coil terminals, simplifies the wiring alignment process during installation, improves assembly efficiency, and avoids poor contact problems caused by wiring deviations.

[0039] The riser base is made of non-magnetic steel, and the riser base mounting plate is made of structural steel. The series reactor mounting plate 8 is made of laminated wood. Optionally, the riser base mounting plate 9 is made of Q355 stainless steel. The double-layer fixing structure of the series reactor mounting plate and the riser base mounting plate ensures a secure reactor installation, reduces operational vibration, and prevents component loosening or performance fluctuations. In terms of operation and maintenance, the integrated design simplifies the assembly process, eliminating the need for complex disassembly during later maintenance and reducing workload. The material selection offers significant advantages: the non-magnetic steel riser base reduces hysteresis loss and electromagnetic interference, ensuring magnetic field stability; the laminated wood ensures the safe and stable operation of the transformer, preventing transformer failure under the corresponding insulation level voltage. Laminated wood also has high mechanical strength, sufficient to bear the weight of the series reactor and resist the mechanical forces of short-circuit in the coils. The laminated wood mounting plate 8 has excellent insulation, improving electrical safety; the Q355 mounting plate 9 has high strength and good load-bearing capacity, ensuring structural stability. These three elements work synergistically to enhance the reliability and durability of the equipment, resulting in outstanding overall benefits.

[0040] The riser mount is installed on the tank wall or cover, adapting to different tank structures and improving installation flexibility. One or three series reactors can be installed. When three are installed, the three series reactors are integrated into the same riser mount in a star or delta connection layout, adapting to single-phase or three-phase transformers. The series reactors can be installed one or three times according to phase requirements, supporting integrated or distributed layouts to meet the needs of transformers with different capacities and phase configurations, offering a wide range of applications. Single-phase transformers, needing external assembly to form a three-phase power supply system, are equipped with one reactor unit, connected in series with a single-phase transformer to participate in the three-phase combined circuit. Three-phase transformers have three independent windings, so they are configured in groups of three, each connected to one of the three phase windings of the transformer in a star or delta connection. This configuration is compatible with the riser mount's internal structure and tank installation method, balancing adaptability and operational stability.

[0041] The core function of series reactance is to increase the output impedance of the transformer, reduce short-circuit current, and thus improve the stability of the power system. Its impedance value is usually specified by the user. Traditionally, this impedance requirement is achieved by adjusting the transformer coil arrangement and size, but this leads to increased equipment size and copper consumption, significantly increasing costs. Series reactance solutions can meet the user's impedance requirements at a lower cost; however, traditional series reactances have the problem of large space requirements. Therefore, this invention, through an innovative design that integrates the series reactance into the riser mount, solves the space occupation problem while retaining the low-cost advantage of series reactances, achieving the dual goals of cost control and space optimization, perfectly adapting to the practical needs of power equipment.

[0042] This innovative device features a built-in riser base, compatible with single-phase or three-phase series reactors. It can be flexibly installed on the transformer tank wall or cover, avoiding the occupation of internal tank space, significantly reducing the overall transformer size, saving transformer oil consumption, optimizing outgoing line layout, and reducing the difficulty of lead insulation design. Furthermore, this device is suitable for retrofitting existing equipment; the transformer impedance can be precisely adjusted by adding a series reactor without significant modifications to the original transformer structure, demonstrating outstanding economic efficiency and practicality. The series reactor body adopts a modular design, combined with a non-magnetic steel riser base, a high-strength steel mounting base, and an insulated laminated wood mounting base, effectively reducing operating losses, improving structural stability and electrical safety. It is suitable for medium-to-high impedance transformers and power system scenarios with prominent short-circuit current control requirements.

[0043] Example 2 A single-phase transformer, equipped with a series reactor device built into a riser as described in Embodiment 1, see [link to Embodiment 1]. Figure 1 , Figure 3 , Figure 4 and Figure 6 One series reactor is set in the main body. Three-phase transformers need to be combined by multiple units (usually three units) to form a complete three-phase power supply system. Therefore, a single single-phase transformer only needs to be configured with one series reactor. The reactor is precisely matched with the single-phase winding of the single equipment to meet its impedance regulation requirements. This ensures that after a single transformer is connected to the combined system, it can work with the other two single-phase transformers to achieve the stable reactance function of the three-phase circuit.

[0044] Example 3 A three-phase transformer is installed with a series reactor device built into a riser base as described in Embodiment 1. Three series reactor bodies are arranged in a star or delta connection within the same riser base. (See also...) Figure 2 and Figure 7 .

[0045] Example 4 With the continuous growth of the power grid, the capacity of the power grid system will inevitably increase, the load density will rise continuously, and the short-circuit current level of the power system will rise sharply, seriously threatening the operational safety of power transformers and the power system. Increasing the impedance of the transformer is an economical, convenient, and effective method for controlling short-circuit current, and it has been widely used in power systems. In recent years, the proportion of medium and high impedance transformers has been increasing year by year, and the application of high impedance transformers has become a trend. The more mainstream and lower-cost method is to use a series reactor in the low-voltage coil, that is, to add a reactor in the corner winding loop. Using a series reactor structure to achieve high impedance of the transformer requires a separate transformer body position and outgoing line space, and must meet the requirements of insulation distance and lead arrangement. Generally, the built-in series reactor will increase the length or width of the tank by 10%-30%. For cases where the low-voltage coil capacity is small, the volume of the series reactor is small, but it still needs to occupy a certain amount of internal tank space, resulting in an increase in transformer volume and waste of transformer oil. This utility model proposes a new structure for installing a series reactor in a riser base, which achieves the purpose of not occupying internal tank space, reducing tank volume, saving transformer oil, and facilitating outgoing lines. It is also applicable to renovation projects where a series reactor is added later to adjust the transformer impedance.

[0046] See Figure 1 A schematic diagram of a series reactor installed inside a single-phase riser. The x1 end of the series reactor output structure 1 is led out through a bushing, the a1 end is connected to the coil, and the wire exits from the inner diameter side. The non-magnetic riser 3 can be installed on the tank wall or the tank cover.

[0047] See Figure 2 A schematic diagram of the series reactor structure installed inside the three-phase integrated riser. The x1, y1, and z1 terminals of the series reactor output structure 1 are led out through bushings, and the a1, b1, and z1 terminals are respectively connected to the coil of that phase, with the wires exiting from the inner diameter side. The riser 3 is a non-magnetic steel riser, which can be installed on the tank wall or the tank cover.

[0048] Figure 3 and Figure 4 This is a detailed structural diagram of the series reactor body 2, including a pull rod 4, a pressure plate 5, a coil 6, a reactor mounting structure 7, and a series reactor mounting base plate 8. The series reactor mounting base plate 8 is made of laminated wood.

[0049] See Figure 6 and Figure 7 The riser mounting base plate 9 is made of Q355 stainless steel and requires full chamfering. The series reactor mounting base plate 8 and the riser mounting base plate 9 are connected by bolts. Lead wires can pass through the round holes in the series reactor mounting base plate 8.

[0050] This embodiment adds a series reactor to a relatively small-capacity low-voltage coil to achieve high impedance during low-voltage operation. The series reactor is installed inside a riser base, which is made of non-magnetic steel plate such as 20Mn23AlV, effectively reducing losses and temperature rise. The series reactor is installed on the tank wall or cover, which features not occupying internal tank space, reducing tank volume, saving transformer oil, and facilitating cable routing. A special installation structure is used to fix the series reactor body inside the riser base, providing sufficient cable routing space. This method is suitable for single-phase and three-phase transformers.

[0051] A method for operating a series reactor device built into a riser base involves mounting the series reactor body onto a riser base mounting plate 9 on the inner wall of the riser base via a series reactor mounting base plate 8, thus placing the series reactor body inside the riser base. The aforementioned series reactor built into the riser base is connected to the power system circuit. When the power system is running, the series reactor body operates stably within the riser base due to the cooperation between the series reactor mounting base plate 8 and the riser base mounting plate 9. Specifically: Install the riser base and base plate assembly: Fix the non-magnetic steel riser base to the tank wall or tank cover, install the Q355 material riser base plate on the inner wall of the riser base, and then fix the laminated wood series reactor base plate to the riser base base plate. Install the series reactor body: Arrange the tie rod around the coil and pass through the pressure plates at both ends of the coil to form an integral structure. Through the reactor mounting structure on the pressure plate at one end of the coil, install the series reactor body on the side of the series reactor mounting base away from the riser mounting base. One or three series reactor bodies are set. Outgoing line connection: The coil terminal of the outgoing line structure of the series reactor is led out from the inner diameter side of the riser base, passes through the through hole of the series reactor mounting base plate and is connected to the coil. The outgoing line terminal of the outgoing line structure is led out of the riser base through the sleeve. Equipment operation: When the equipment is powered on, the eddy current loss is reduced by the non-magnetic steel riser, so that the series reactor can work stably in the riser.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A device for a riser base with a built-in series reactor, characterized in that, The system includes a series reactor body, a series reactor mounting base plate (8), and a riser mounting base plate (9). The series reactor body is located inside the riser base, and the riser mounting base plate (9) is located on the inner wall of the riser base. The series reactor body is mounted on the series reactor mounting base plate (8), and the series reactor mounting base plate (8) is mounted on the riser mounting base plate (9). The series reactor body includes a series reactor output structure (1). The lead-out end of the series reactor output structure (1) is led out of the riser base through a bushing. The coil connection end of the series reactor output structure (1) is led out along the inner diameter side of the riser base. The coil connection end of the series reactor output structure (1) is connected to the transformer coil.

2. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The series reactor body includes a pull rod (4), a pressure plate (5), a coil (6), and a reactor mounting structure (7). Several pull rods (4) are arranged around the coil (6). Pressure plates (5) are provided at both ends of the coil (6). The pull rods (4) are installed through the pressure plates (5). The reactor mounting structure (7) is installed on the pressure plate (5) at one end of the coil (6). The reactor mounting structure (7) is installed on the side of the series reactor mounting base plate (8) away from the riser mounting base plate (9).

3. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The series reactor mounting base plate (8) is provided with through holes.

4. The device for a riser seat with a built-in series reactor according to claim 3, characterized in that, The coil terminal of the series reactor output structure (1) is connected to the transformer coil through the through hole.

5. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The lifting seat is made of non-magnetic steel, and the mounting base plate (9) of the lifting seat is made of structural steel.

6. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The mounting base plate (8) of the series reactor is made of laminated wood.

7. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The riser is installed on the tank wall or the cover of the transformer tank.

8. The device for a riser seat with a built-in series reactor according to claim 1, characterized in that, The series reactor body is provided with one or three. When three are provided, the three series reactor bodies are integrated in the same riser base in a star or delta connection layout.

9. A single-phase transformer, characterized in that, Install a raised seat with a built-in series reactor device as described in any one of claims 1-7, wherein one series reactor body is provided.

10. A three-phase transformer, characterized in that, Install a riser base with built-in series reactor device as described in any one of claims 1-7, wherein three series reactor bodies are provided, and the three series reactor bodies are connected in a star or delta configuration within the same riser base.

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