A four-coil 500kV line series reactor arrangement system

Abstract

This utility model relates to the technical field of power equipment layout systems, and more particularly to a four-coil 500kV line series reactor layout system. The system includes a coil group comprising a first coil, a second coil, a third coil, and a fourth coil, arranged in a positive direction. The line of the series reactor is introduced into the first coil via a busbar, sequentially passes through the second and third coils, and is led out to the line from the fourth coil. The series reactor is a dry-type hollow reactor. By implementing this utility model, the system can effectively install reactors in series reactor stations in the middle section of a 500kV transmission line and in substations at both ends of the line, thus solving the shortcomings of the prior art and meeting the needs of power grid structure optimization and short-circuit current control.

Description

Technical Field

[0001] This utility model relates to the field of power equipment layout system technology, and in particular to a four-coil 500kV line series reactor layout system. Background Technology

[0002] Faced with the challenges of rapid load growth and the penetration of new energy sources, the existing power grid structure is experiencing increasingly severe short-circuit current problems due to dynamic changes on both the load and power supply sides. Particularly in a certain regional power grid, with the strengthening of the main grid and the commissioning of large-capacity generating units, the short-circuit current level at key nodes is constantly rising, posing significant challenges to short-circuit current control. Although the power grid has attempted to limit short-circuit current in certain areas by adjusting its operation modes, such as single-outlet operation and shutting down some synchronous condensers, this approach weakens the main grid structure, affects power supply reliability, and limits the normal operation of synchronous condensers. To reduce short-circuit current levels and optimize the grid structure, the power grid has attempted to rationally group power sources and loads by adding new lines and substations. However, due to the difficulty and long construction period of new line corridors and substations, significant results are unlikely to be achieved in the short term. Therefore, the installation of series reactors on certain lines, along with large-capacity 500kV line series reactors, is considered as one solution. Because of the large capacity of these reactors, four coils are required per phase, a requirement that conventional series reactor solutions cannot meet.

[0003] Existing conventional 500kV line series reactor schemes, such as Figures 1 to 3 As shown, the existing design can only provide reactors with two coils per phase, which does not reach the Gvar level. However, the GVar level 6000A high-capacity 500kV line series reactor has twice the number of coils per phase compared to conventional reactors, increasing to four coils. The existing design cannot accommodate the arrangement of such a high-capacity series reactor with four coils. For example... Figure 4 As shown, if the conventional solution is used in a series reactor device with four coils, it is impossible to install a coupling capacitor in parallel between the first and fourth coils. The coupling capacitor is necessary to suppress the circuit breaker's TRV (Transient Voltage Reduction) problem after the series reactor device is installed; its inability to be installed renders the series reactor device ineffective. Furthermore, the conventional solution is typically used for installing reactors in substations at the ends of power grid lines and cannot be applied to series reactor stations in the middle of the line.

[0004] Therefore, it is necessary to design a new system that can effectively install reactors not only in series reactor stations in the middle section of 500kV transmission lines, but also in substations at the end of the lines, thereby solving the shortcomings of existing technologies and meeting the needs of power grid structure optimization and short-circuit current control. Utility Model Content

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a four-coil 500kV line series reactor arrangement system.

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution: providing a four-coil 500kV line series reactor arrangement system, including a coil group, the coil group including a first coil, a second coil, a third coil and a fourth coil, the first coil, the second coil, the third coil and the fourth coil are arranged in a positive direction, the line of the series reactor is introduced into the first coil through a busbar, passes through the second coil and the third coil in sequence, and is led out to the line by the fourth coil; the type of series reactor is dry hollow type.

[0007] The further technical solution is as follows: the first coil is arranged adjacent to the fourth coil and the second coil respectively.

[0008] The further technical solution is as follows: the distance between the first coil and the fourth coil is 13.5m.

[0009] The further technical solution is as follows: the distance between the first coil and the second coil is 13.5m.

[0010] The further technical solution is as follows: the distance between the second coil and the third coil is 13.5m; the distance between the third coil and the fourth coil is 13.5m.

[0011] A further technical solution includes a fence located outside the coil assembly.

[0012] The further technical solution is that the distance between the coil group and the fence is 10.5m.

[0013] The further technical solution is as follows: the width of the fence is 34.5m; the length of the fence is 88.5m.

[0014] A further technical solution is as follows: a coupling capacitor is connected between the first coil and the fourth coil.

[0015] The further technical solution is that a surge arrester is connected to the line.

[0016] The further technical solution is as follows: voltage limiting arresters are connected in parallel at both ends of the first coil, the second coil, the third coil and the fourth coil.

[0017] The advantages of this invention compared to the prior art are as follows: By arranging the first, second, third, and fourth coils in a square orientation, this invention achieves the parallel connection of a coupling capacitor between the first and fourth coils without requiring additional land for the return line, thus realizing the effective installation of the series reactor. The current flows through the four coils sequentially via the busbar and is finally led out to the line through the fourth coil. This arrangement makes the installation of the series reactor more compact and neat, solving the installation difficulties caused by space and layout limitations in the prior art. It can not only meet the installation requirements of series reactor stations in the middle section of 500kV transmission lines, but also be applied to substations at the end of the line, thereby achieving the goals of power grid structure optimization and short-circuit current control.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 The primary wiring diagram for a 500kV line series reactor in the existing technology;

[0021] Figure 2 A schematic diagram of the planar arrangement of series reactors for a 500kV line in the prior art;

[0022] Figure 3 Cross-sectional diagram of 500kV line series withstand capability in existing technology;

[0023] Figure 4 This is a layout diagram for the application of existing technology to four-coil series reactance;

[0024] Figure 5 A wiring diagram of a four-coil 500kV line series reactor arrangement system provided for an embodiment of this utility model;

[0025] Figure 6 A schematic diagram of a four-coil 500kV line series reactor arrangement system provided for an embodiment of this utility model, showing the coil groups arranged in a square.

[0026] Figure 7 A schematic diagram of the plan layout of a four-coil 500kV line series reactor arrangement system provided for an embodiment of this utility model;

[0027] Figure 8A cross-sectional view of a four-coil 500kV line series reactor arrangement system provided for an embodiment of this utility model;

[0028] Explanation of the markings in the image:

[0029] 10. First coil; 20. Second coil; 30. Third coil; 40. Fourth coil; 50. Coupling capacitor; 60. Surge arrester; 70. Fence; 80. Voltage limiting surge arrester. Detailed Implementation

[0030] The technical solutions of the present utility model 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 utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] The existing power grid is facing increasing challenges from load growth and the penetration of new energy sources, leading to more severe short-circuit current problems. This is especially true after the strengthening of the main grid and the commissioning of large-capacity generating units, causing a continuous rise in short-circuit current levels at critical nodes and increasing the difficulty of short-circuit current control. Although measures have been taken to address this by adjusting grid operation modes and restricting the operation of some equipment, these measures have weakened the grid structure and reliability. Attempts have been made to reduce short-circuit current and optimize the grid structure by adding new lines and substations in a rational grouping manner, but the long construction period makes it difficult to achieve rapid results. Therefore, the installation of large-capacity 500kV series reactors on some lines is being considered, but existing solutions cannot meet the requirements of large-capacity equipment with four coils.

[0035] Therefore, this utility model provides a four-coil 500kV line series reactor arrangement system, which can not only realize the effective installation of reactors in series reactor stations in the middle section of 500kV transmission lines, but also be applied in substations at the end of the line, thus solving the shortcomings of the prior art and meeting the needs of power grid structure optimization and short-circuit current control. Here, "line series reactor" is short for line series reactor, which is a reactor connected in series on the transmission line to limit the short-circuit current of the system.

[0036] Specifically, this four-coil 500kV line series reactor arrangement system achieves effective reactor installation through a unique coil group layout, solving the problem of the inability to arrange coupling capacitors in conventional designs, reducing unnecessary land waste, and optimizing the overall reactor layout. The system includes four coils: coil 10, coil 20, coil 30, and coil 40, which are connected in series, with a distance of 13.5 meters between each coil. The line is introduced into coil 10 via a busbar, passes through each coil in sequence, and exits through coil 40. This design uses dry-type hollow series reactors and configures coupling capacitors 50, voltage-limiting surge arresters 80, and line surge arresters 60 at appropriate locations to enhance the stability and reliability of the system. In addition, the arrangement of the fence 70 ensures the safety of the equipment; this arrangement not only optimizes the power grid structure and improves the control capability of short-circuit current, but also meets the actual needs of the 500kV power grid mid-section series reactor station.

[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0038] Please see Figures 5 to 8 A four-coil 500kV line series reactor arrangement system includes a coil group, which includes a first coil 10, a second coil 20, a third coil 30, and a fourth coil 40. The first coil 10, the second coil 20, the third coil 30, and the fourth coil 40 are arranged in a positive direction. The line of the series reactor is introduced into the first coil 10 through a busbar, passes through the second coil 20 and the third coil 30 in sequence, and is led out to the line by the fourth coil 40. The series reactor is a dry-type hollow type.

[0039] In this embodiment, the coil group consists of four coils: a first coil 10, a second coil 20, a third coil 30, and a fourth coil 40. These coils are connected in series to form the main part of the series reactor.

[0040] The four coils are arranged in a square pattern, ensuring that the first and last coils are adjacent, which helps to reduce the length of wiring and return lines. In this arrangement, the current flows sequentially through each coil, from the first coil 10 to the fourth coil 40, forming a reactive path after being connected in series. At the same time, because the first and fourth coils are arranged adjacently, a coupling capacitor can be connected in parallel between the first and fourth coils without requiring additional ground space for the return line.

[0041] The circuit of the series reactor is introduced into the first coil 10 through the busbar, and the current flows in from the coil, which plays a reactance role.

[0042] Current flows from the first coil 10 to the second coil 20 to continue reactance adjustment.

[0043] The current then enters the third coil 30, which continues to form a reactance network together with the first two coils.

[0044] Finally, the current passes through the fourth coil 40, is drawn out from the coil, and eventually enters the transmission line.

[0045] The series reactor uses a dry-type air-core coil design. The advantages of this design are:

[0046] Reduced maintenance requirements: The dry design means there is no cooling medium such as liquid or oil, avoiding the risk of liquid leakage and making maintenance simpler.

[0047] High-efficiency heat dissipation: Dry air coils have excellent heat dissipation performance and can effectively maintain stable operation under high current and high voltage conditions.

[0048] The square arrangement of the four coils results in a compact overall system size, effectively saving floor space and making it suitable for various applications. Through a rational layout, the influence of electric fields and the range of magnetic shielding are considered, making the system more stable during operation and avoiding excessive electric field concentration. The square arrangement of the four coils also makes the system more organized, reducing wiring complexity and making maintenance easier.

[0049] This four-coil 500kV line series reactor arrangement system is not only suitable for mid-section series reactor stations of 500kV transmission lines, but also for substations at the ends of lines or substation busbar sections where reactors need to be installed. This design is not only applicable to conventional 500kV transmission lines, but can also be flexibly adjusted according to different capacity and configuration requirements.

[0050] The innovation of the square layout lies in its solution to the problem in conventional designs where linear layouts prevent the placement of coupling capacitor return lines without additional space, reducing unnecessary land waste and optimizing the overall reactor layout. Through precise coil spacing (13.5 meters), along with the design of the fencing 70 and other facilities, the entire system exhibits high adaptability in physical space, especially in confined or restricted environments.

[0051] This system provides a highly efficient, energy-saving, easy-to-maintain, and compact power regulation device for a four-coil 500kV line. Its innovative square arrangement solves some problems associated with traditional linear layouts, improving the overall performance and availability of the power equipment. Meanwhile, the dry-type hollow design ensures the reliability and long-term operational stability of the reactors. This system provides reliable technical support for the stable operation of modern high-capacity high-voltage transmission lines.

[0052] In one embodiment, such as Figure 6 As shown, the first coil 10 is arranged adjacent to the fourth coil 40 and the second coil 20, respectively.

[0053] In one embodiment, such as Figure 6 As shown, the distance between the first coil 10 and the fourth coil 40 is 13.5m.

[0054] In one embodiment, such as Figure 6 As shown, the distance between the first coil 10 and the second coil 20 is 13.5m.

[0055] In one embodiment, such as Figure 6 As shown, the distance between the second coil 20 and the third coil 30 is 13.5m; the distance between the third coil 30 and the fourth coil 40 is 13.5m.

[0056] In this embodiment, as Figure 6 As shown, the distance between the first coil 10 and the fourth coil 40 is 13.5 meters. This spacing is designed to maintain appropriate electric and magnetic field distribution, ensuring safe operation of the equipment. Simultaneously, this layout ensures high efficiency in terms of electrical isolation and space utilization. By using a reasonable coil spacing, electric field interference and magnetic field effects can be minimized.

[0057] Similarly, a spacing of 13.5 meters is maintained between the first coil 10 and the second coil 20. This design not only avoids mutual interference between adjacent coils but also effectively controls the electrical characteristics of the series reactor, ensuring its stable operation throughout the power grid.

[0058] like Figure 6As shown, the distance between the second coil 20 and the third coil 30 is also set to 13.5 meters. This equal-spacing design ensures a uniform current distribution and a relatively stable voltage-current relationship between the coils, which can improve the reliability of the equipment and reduce potential risks in system operation.

[0059] The third coil 30 and the fourth coil 40 are also spaced 13.5 meters apart. This layout helps reduce mutual inductance between the coils, thereby improving the overall stability of the line. Furthermore, the uniform spacing of the four coils helps to fully utilize the function of each coil in a high-capacity 500kV line.

[0060] With the square arrangement described above, the spacing between each coil is uniform, and the overall layout of the equipment is compact and reasonable. This effectively reduces the floor space occupied by the equipment, minimizes interference between devices, and improves operating efficiency. Most importantly, the adjacent arrangement of the first coil 10 and the fourth coil 40 in the square arrangement avoids the common problem of needing additional space to install coupling capacitors and return lines in a linear four-coil arrangement. This saves land while simultaneously improving the overall stability and reliability of the system.

[0061] In one embodiment, such as Figure 7 and Figure 8 As shown, the above-mentioned four-coil 500kV line series reactor arrangement system also includes a fence 70, which is located outside the coil group.

[0062] In one embodiment, such as Figure 7 and Figure 8 As shown, the distance between the coil group and the fence 70 is 10.5m.

[0063] In one embodiment, such as Figure 7 As shown, the width of the aforementioned fence 70 is 34.5m; the length of the fence 70 is 88.5m.

[0064] In this embodiment, the fence 70 is designed to be installed outside the coil assembly, serving a protective and isolating function to ensure the safety of the equipment and personnel. The design of the fence 70 not only contributes to the stable operation of the equipment but also effectively prevents external interference and potential safety risks.

[0065] In this embodiment, the distance between the coil assembly and the fence 70 is set at 10.5 meters. This distance was chosen considering various factors, including equipment safety, electromagnetic interference control, and equipment operational stability. A suitable distance effectively prevents electromagnetic interference generated during the operation of the series reactor, ensuring its normal operation. Simultaneously, it ensures sufficient safe distance between operators and equipment to avoid potential hazards.

[0066] According to the design requirements, the width and length of the 70mm fence were also planned in detail:

[0067] The fence 70 is 34.5 meters wide. This width is sufficient to accommodate the entire tandem arrestor system and provides ample space for equipment maintenance and operation. The well-designed width ensures sufficient space for personnel to operate during operation and maintenance.

[0068] The fence 70 is 88.5 meters long. The length of fence 70 is designed to cover the entire area where the four-coil series reactor equipment is installed. This size not only effectively surrounds the reactor system but also provides sufficient space to install all necessary electrical connections and protective equipment.

[0069] The layout and design of the fence 70 are closely integrated with the arrangement of the four-coil series reactor. By installing the fence 70 on the outside of the equipment, not only is the safety of the reactor system enhanced, but it also facilitates its maintenance and repair. The size and position of the fence 70 ensure sufficient space around the equipment for operation, reducing the impact of the external environment on the reactor's operation.

[0070] Through a well-designed fence 70, potential electromagnetic interference can be effectively isolated, ensuring the efficient and stable operation of the series reactor system and providing a safe working environment for operators. In practical applications, this fence 70 design fully considers the actual usage requirements of the equipment, providing convenience and safety for system installation, maintenance, and operation.

[0071] In summary, the installation of the fence 70 plays an important role in the four-coil 500kV line series reactor arrangement system of this utility model. It not only protects the equipment and ensures the safety of personnel, but also provides a reliable guarantee for the long-term stable operation of the equipment.

[0072] In one embodiment, such as Figure 5 As shown, a coupling capacitor 50 is connected between the first coil 10 and the fourth coil 40. The key function of this design is to couple the line current and reduce its peak value, suppressing the problem of excessive transient recovery voltage (TRV) of the circuit breaker equipment on both sides of the line, and further improving the stability and safety of the line. The main function of the coupling capacitor 50 is to effectively regulate the electric field distribution and reduce electrical coupling between the coils by transferring current from the first coil 10 to the fourth coil 40. This design not only optimizes the current flow path but also reduces voltage fluctuations caused by electrical interference, thus making the system more stable and efficient.

[0073] In one embodiment, such as Figure 5As shown, a surge arrester 60 is connected to the aforementioned line. The function of the surge arrester 60 is to protect the line and equipment from the effects of lightning strikes or voltage surges. By installing the surge arrester 60 in a suitable location, external overvoltages can be effectively absorbed, preventing power equipment from failing due to voltage surges. Especially in 500kV high-voltage lines, the use of surge arresters 60 is particularly important due to the high voltage characteristics of the system. It ensures the safe operation of the system and prevents equipment damage and power outages caused by power overloads or sudden faults.

[0074] In one embodiment, the two ends of the first coil 10, the second coil 20, the third coil 30 and the fourth coil 40 are respectively connected in parallel with a voltage limiting arrester 80 to protect the reactor coil.

[0075] The overall benefits of this design scheme are:

[0076] The combination of coupling capacitor 50 and surge arrester 60 can effectively prevent equipment damage caused by voltage fluctuations or lightning strikes, thereby improving system safety.

[0077] By using coupling capacitor 50, the problem of excessive transient recovery overvoltage (TRV) of circuit breaker equipment on both sides of the line is suppressed, thereby ensuring the stability of the power system.

[0078] The adoption of a square layout and efficient electrical connection methods reduces wiring complexity and equipment footprint, thereby improving system operating efficiency.

[0079] This design is applicable to line series reactance of various capacities and layouts, and can be used in a variety of scenarios, demonstrating strong versatility.

[0080] In summary, this design, through the combination of coupling capacitor 50 and surge arrester 60, provides a more reliable and stable solution, while also making the system layout more compact and efficient, thus ensuring the stable operation of high-voltage transmission lines.

[0081] In one embodiment, the capacity of the series reactor can be adjusted according to different engineering requirements. For example, if a higher reactance value is required, the current carrying capacity of each coil can be increased or the size of the coil can be adjusted. In this case, the distance between the coils and the size of the enclosure 70 also need to be adjusted accordingly to ensure stable system operation; specifically, highly conductive materials (such as copper or aluminum alloy) are used to increase the current carrying capacity of each coil. Using larger cross-section wires can reduce current losses when passing through the coils. The reactance value can be increased by increasing the diameter of the coil or increasing the number of turns. Larger coils can increase the alternation range of the magnetic field, thereby increasing the reactance value. When increasing the size of the reactor, the spacing between the coils should be adjusted accordingly to ensure that no unnecessary electrical interference is caused. The size of the enclosure 70 also needs to be adjusted according to the increased size to ensure the safety of the power system.

[0082] In one embodiment, each coil can be designed as an independent module with a unified interface, standardized dimensions, and interchangeability, facilitating future expansion and maintenance. Standardized electrical connections and layouts ensure flexible combination and disassembly of modular units. Redundancy design, such as the configuration of spare modules, is considered in modular systems to ensure rapid system recovery in the event of a failure, minimizing power outage time.

[0083] In one embodiment, for high-humidity environments, more corrosion-resistant materials, such as stainless steel, galvanized metal, or coated materials, can be selected for the manufacture of coils and support frames to prevent corrosion problems in humid environments. Electrical equipment is waterproofed and dustproofed, for example, by using waterproof housings or increasing the protection rating (IP rating). Sealed designs or waterproof gaskets are used to enhance the equipment's adaptability. In high-temperature environments, powerful cooling devices, such as air-cooled or water-cooled systems, can be used to ensure the equipment temperature is maintained within the normal range. Furthermore, thermistors and temperature monitoring devices can be added to automatically adjust the operating temperature. The design of the enclosure 70 and the support frame is optimized to adapt to different environmental conditions, such as using materials with low coefficients of thermal expansion in low-temperature or high-temperature environments.

[0084] In one embodiment, sensors for temperature, humidity, current, voltage, vibration, etc., are installed on each coil and its components to monitor the operating status in real time. All sensor data is transmitted to the central control system in real time via wireless or wired networks. A monitoring system is established on a cloud platform or local area network to achieve remote monitoring and alarms. The system can automatically diagnose equipment faults and alert maintenance personnel for handling. Utilizing big data analytics and machine learning algorithms, the system analyzes equipment operating trends, provides early warnings of potential equipment failure points, and performs intelligent prediction and maintenance. Intelligent control functions are integrated into the monitoring system to automatically adjust the reactor's operating status based on sensor data, such as adjusting current and regulating the cooling system.

[0085] These technical solutions ensure that the system can operate stably and maintain flexibility and scalability under different environments, while improving the adaptability, intelligent management capabilities, and ease of maintenance of the equipment.

[0086] The above system meets the installation requirements for series reactors in the middle of a 500kV transmission line. Based on the GVar-level 6000A high-capacity 500kV line series reactor design, four 7Ω coils are connected in series, configured as a dry-type hollow structure. The four coils are arranged in a square. The line is introduced into the first coil 10 through the busbar, then sequentially through the second and third coils 30, and finally output to the line through the fourth coil 40. In the square arrangement, the first and fourth coils 40 are arranged adjacently to facilitate the parallel connection of coupling capacitors 50 at the busbar entry and exit points. The wiring diagram and the square arrangement diagram of the four coils proposed in this utility model are as follows. Figure 5 and Figure 6 As shown:

[0087] Based on the dimensions and weight of the tandem rotor, the transport road width is 4.5 meters, the turning radius of the crane's travel road is 15 meters, and the turning radius of the equipment transport vehicle is 20 meters.

[0088] This system is suitable for four-coil 500kV line series reactors of various capacities and arrangements. It can be used as a standard module in series reactor stations in the middle of 500kV transmission lines, and is also suitable for situations where four-coil series reactor equipment needs to be installed in end substations of 500kV transmission lines or between 500kV busbar sections of substations.

[0089] The system cleverly utilizes a four-coil square arrangement, making the first and last coils adjacent to each other. This allows for the placement of coupling capacitors underground without adding extra space, resulting in a neater and more compact arrangement that saves floor space and facilitates daily operation and maintenance.

[0090] The four-coil 500kV line series reactor adopts a square arrangement, optimizing the equipment layout and improving the overall design efficiency. It effectively compensates for the insufficient adaptability of conventional 500kV line series reactor arrangements to four-coil reactors, and can accommodate four-coil 500kV line series reactors of different capacities and layouts. This scheme can be applied not only to intermediate series reactor substations but also to the installation needs of end substations or 500kV busbar sections. Furthermore, the square arrangement allows for the installation of coupling capacitors, resulting in a more compact layout, reduced floor space, and easier maintenance and operation.

[0091] The aforementioned four-coil 500kV line series reactor arrangement system achieves effective installation of the series reactor by arranging the first coil 10, second coil 20, third coil 30, and fourth coil 40 in a square direction and adopting a dry hollow structure. The current flows through the four coils sequentially via the busbar and is finally led out to the line through the fourth coil 40. This arrangement makes the installation of the series reactor more compact and neat, solving the installation difficulties caused by space and layout limitations in the prior art. It can meet the installation requirements of the series reactor station in the middle section of the 500kV transmission line, thereby achieving the goals of power grid structure optimization and short-circuit current control.

[0092] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A four-coil 500 kV line series reactor arrangement system, characterized in that, The system includes a coil group comprising a first coil, a second coil, a third coil, and a fourth coil. The first coil, the second coil, the third coil, and the fourth coil are arranged in a positive direction. The circuit of the series reactor is introduced into the first coil through a busbar, passes through the second coil and the third coil in sequence, and is led out to the circuit by the fourth coil. The series reactor is a dry-type hollow reactor.

2. The four-coil 500kV line series reactor arrangement system according to claim 1, characterized in that, The first coil is arranged adjacent to the fourth coil and the second coil, respectively.

3. A four-coil 500kV line series reactor arrangement system according to claim 2, characterized in that, The distance between the first coil and the fourth coil is 13.5m.

4. A four-coil 500kV line series reactor arrangement system according to claim 2, characterized in that, The distance between the first coil and the second coil is 13.5m.

5. A four-coil 500kV line series reactor arrangement system according to claim 2, characterized in that, The distance between the second coil and the third coil is 13.5m; the distance between the third coil and the fourth coil is 13.5m.

6. A four-coil 500kV line series reactor arrangement system according to claim 1, characterized in that, It also includes a fence located outside the coil assembly.

7. A four-coil 500kV line series reactor arrangement system according to claim 6, characterized in that, The distance between the coil group and the fence is 10.5m.

8. A four-coil 500kV line series reactor arrangement system according to claim 6, characterized in that, The fence is 34.5m wide and 88.5m long.

9. A four-coil 500kV line series reactor arrangement system according to claim 1, characterized in that, A coupling capacitor is connected between the first coil and the fourth coil.

10. A four-coil 500kV line series reactor arrangement system according to claim 1, characterized in that, A surge arrester is connected to the line.

11. A four-coil 500kV line series reactor arrangement system according to claim 1, characterized in that, The first coil, the second coil, the third coil, and the fourth coil are connected in parallel with voltage-limiting surge arresters at both ends.

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