Four-coil 500kV line series reactor arrangement system

Abstract

The invention relates to the technical field of electrical equipment arrangement systems, in particular to a four-coil 500kV line series reactor arrangement system, which comprises a coil group, the coil group comprises a first coil, a second coil, a third coil and a fourth coil, and the first coil, the second coil, the third coil and the fourth coil are arranged in a positive direction. A circuit of the series reactor is led into the first coil through a tubular bus, sequentially passes through the second coil and the third coil and is led out to the circuit through the fourth coil. The series reactor is of a dry hollow type. By implementing the system provided by the embodiment of the invention, effective installation of the reactors in the series reactor station in the middle section of the 500kV power transmission line and the transformer substations at the two ends of the line can be realized, so that the defects in the prior art are overcome, and the requirements of power grid structure optimization and short-circuit current control are met.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment arrangement systems, and in particular to a four-coil 500kV line series impedance arrangement system. Background Art

[0002] Faced with the challenges of rapid load growth and the penetration of renewable energy, the existing power grid structure faces increasingly severe short-circuit current problems due to dynamic changes on both the load and power supply sides. In one particular region, with the strengthening of the main grid and the commissioning of large-capacity turbines, short-circuit current levels at key grid nodes have continued to rise, making short-circuit current control extremely challenging. Although this grid has limited short-circuit currents in certain areas by adjusting grid operation, such as single-phase operation and shutting down some phase-converters, this approach weakens the main grid structure, impacts power supply reliability, and limits the normal operation of phase-converters. To reduce short-circuit current levels and optimize the grid structure, this grid is attempting to rationally group power sources and loads by adding new lines and substations. However, due to the difficulty and timeliness of constructing 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, particularly large-capacity 500kV line series reactors, is being considered as a solution. Due to 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 solutions, such as Figures 1 to 3 As shown, only two coils per phase reactors can be provided, which does not reach the Gvar level. However, the number of coils per phase of the GVar level 6000A large-capacity 500kV line series reactor is doubled compared to conventional reactors, increasing to four coils. The existing solution cannot adapt to the layout of large-capacity series reactors with four coils. Figure 4 As shown, if a conventional solution is used for a four-coil series reactor device, it is impossible to install a coupling capacitor in parallel between the first and fourth coils. This coupling capacitor is necessary to suppress the TRV problem of the circuit breaker after the series reactor device is installed. Failure to install it will render the series reactor device ineffective. Furthermore, the conventional solution is typically used to install reactors in substations at the end of a power line and cannot be applied to series reactor stations in the middle of a line.

[0004] Therefore, it is necessary to design a new system that can realize the effective installation of reactors not only in the series reactor station in the middle section of the 500kV transmission line, but also in the substation at the end of the line, thereby solving the shortcomings of the existing technology and meeting the needs of grid structure optimization and short-circuit current control. Summary of the Invention

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

[0006] In order to solve the above technical problems, the purpose of the present invention is achieved through the following technical solutions: 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 inductor is introduced into the first coil through the tubular bus, 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 the series inductor is a dry hollow type.

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

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

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

[0010] A further technical solution is: 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 is: it also includes a fence, and the fence is located outside the coil group.

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

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

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

[0015] A further technical solution is: a lightning arrester is connected to the line.

[0016] A further technical solution is: voltage-limiting lightning arresters are connected in parallel to both ends of the first coil, the second coil, the third coil and the fourth coil.

[0017] The beneficial effects of the present invention compared with the prior art are as follows: by arranging the first coil, the second coil, the third coil and the fourth coil in a square direction, the present invention realizes the parallel connection of the coupling capacitor between the first coil and the fourth coil without adding additional land for arranging the return line, thereby realizing the effective installation of the series inductor; the current flows through the four coils in sequence through the tubular busbar, and is finally led out to the line through the fourth coil; this arrangement scheme makes the installation of the series inductor more compact and neat, and solves the installation difficulties caused by space and layout limitations in the prior art. It can not only meet the installation requirements of the series inductor station in the middle section of the 500kV transmission line, but can also be used in the substation at the end of the line, thereby achieving the goals of 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is the primary wiring diagram of the 500kV line series reactor in the existing technology;

[0021] Figure 2 This is a schematic diagram of the plane layout of 500kV line series reactors in the prior art;

[0022] Figure 3 This is a cross-sectional diagram of a 500kV line series resistor in the prior art;

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

[0024] Figure 5 A wiring diagram of a four-coil 500kV line series reactor arrangement system provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a four-coil 500kV line series impedance arrangement system provided by an embodiment of the present invention, in which coil groups are arranged in a square;

[0026] Figure 7 A schematic diagram of the planar layout of a four-coil 500kV line series reactor arrangement system provided by an embodiment of the present invention;

[0027] Figure 8 A cross-sectional view of a four-coil 500kV line series reactor arrangement system provided by an embodiment of the present invention;

[0028] Description of the symbols in the figure:

[0029] 10. First coil; 20. Second coil; 30. Third coil; 40. Fourth coil; 50. Coupling capacitor; 60. Lightning arrester; 70. Fence; 80. Voltage-limiting lightning arrester. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups 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 present invention. As used in the specification and 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 be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0034] Faced with the challenges of increasing loads and the penetration of renewable energy, the existing power grid is facing an increasingly severe short-circuit current problem. This is especially true following the strengthening of the main grid and the commissioning of large-capacity turbines. Short-circuit current levels at key nodes are rising, making short-circuit current control more difficult. While adjustments to grid operation and restrictions on some equipment have been implemented to address this problem, these measures have weakened the grid's structure and reliability. To reduce short-circuit currents and optimize the grid structure, attempts have been made to rationally group new lines and substations, but the long construction period has hindered rapid effectiveness. Therefore, consideration is being given to installing large-capacity 500kV series reactors on some lines, but the existing solution cannot meet the requirements of large-capacity equipment with four coils.

[0035] To this end, embodiments of the present invention provide a four-coil 500kV line series reactor arrangement system. This system not only enables the efficient installation of reactors in series reactor stations located midway along 500kV transmission lines, but can also be applied to substations at the end of the line, thereby addressing shortcomings in existing technologies and meeting the needs of grid structure optimization and short-circuit current control. A line series reactor is short for a line series reactor, a reactor connected in series with a transmission line to limit system short-circuit current.

[0036] Specifically, the four-coil 500kV line series reactor arrangement system achieves effective installation of the reactor 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 layout of the entire reactor. The system includes four coils, namely the first coil 10, the second coil 20, the third coil 30, and the fourth coil 40, which are connected in series in sequence, and the distance between each coil is 13.5 meters. The line is introduced into the first coil 10 through the tubular busbar, passes through each coil in sequence, and is led out through the fourth coil 40. The design uses dry-type hollow series reactors and configures coupling capacitors 50, voltage-limiting lightning arresters 80, and line lightning arresters 60 in appropriate locations, enhancing 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 grid structure and improves the control capability of short-circuit current, but also meets the actual needs of the series reactor station in the middle section of the 500kV grid.

[0037] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] See also 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 tubular bus, 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 type of the series reactor is a dry hollow type.

[0039] In this embodiment, the coil group is composed of four coils, namely 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, ensuring proximity between the first and last coils, which helps reduce wiring and return line lengths. In this arrangement, current flows through each coil in sequence, from the first coil 10 to the fourth coil 40, forming a series reactance path. Furthermore, the adjacent placement of the first and fourth coils allows for a coupling capacitor to be connected in parallel between them without requiring additional space for return lines.

[0041] The line of the series reactor is introduced into the first coil 10 through the tube bus, and the current starts to flow from the coil, playing the role of reactance.

[0042] The current flows from the first coil 10 to the second coil 20, and the reactance adjustment continues.

[0043] The current then enters the third coil 30 and 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 finally enters the transmission line.

[0045] The series reactor adopts 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, eliminating the risk of liquid leakage and making maintenance easier.

[0047] Efficient heat dissipation: The dry hollow coil has good heat dissipation performance and can effectively maintain stable operation under high current and high voltage conditions.

[0048] The four-coil square layout makes the overall system compact, effectively saving floor space and making it suitable for a variety of applications. This rational layout takes into account the influence of electric fields and the magnetic shielding range, making the system more stable during operation and avoiding excessive electric field concentration. The four-coil square layout also makes the system more organized, reduces wiring complexity, and facilitates maintenance.

[0049] This four-coil 500kV line series reactor arrangement system is not only suitable for mid-range series reactor stations on 500kV transmission lines, but can also be used in substations at the end of the line or where reactors are required at substation busbar sections. This design solution is not only applicable to conventional 500kV transmission lines but can also be flexibly adjusted to meet different capacity and configuration requirements.

[0050] The square layout is innovative because it solves the problem of conventional linear layouts that prevent the coupling capacitor return lines from being routed without additional space, reducing unnecessary land use and optimizing the overall reactor layout. The precise coil spacing (13.5 meters), combined with the design of the 70-meter fence and other facilities, makes the entire system highly adaptable to physical space, especially in confined or constrained environments.

[0051] This system, a four-coil 500kV line series reactor system, provides a highly efficient, energy-efficient, easy-to-maintain, and compact power conditioning device. Its innovative square layout overcomes some of the challenges of traditional linear layouts, improving the overall performance and availability of power equipment. Furthermore, the dry-type hollow-core design ensures the reactor's reliability and long-term operational stability. This system provides reliable technical support for the stable operation of modern, large-capacity, high-voltage transmission lines.

[0052] In one embodiment, if 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, if Figure 6 As shown, the distance between the first coil 10 and the fourth coil 40 is 13.5 m.

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

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

[0056] In this embodiment, if Figure 6 As shown, the distance between the first coil 10 and the fourth coil 40 is 13.5 meters. This distance arrangement is intended to maintain appropriate electric and magnetic field distribution, ensuring safe operation of the device. This layout also ensures efficient electrical isolation and space utilization. Proper coil spacing minimizes electric field interference and magnetic field effects.

[0057] Similarly, a distance 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, enabling it to operate stably in the entire 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 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 even spacing of the four coils helps maximize the effectiveness of each coil in high-capacity 500kV lines.

[0060] The square arrangement described above ensures uniform spacing between coils and a compact, rational overall layout, effectively reducing the equipment's footprint, minimizing interference between devices, and improving operational efficiency. Most importantly, the adjacent placement of the first coil 10 and the fourth coil 40 in the square arrangement avoids the common four-coil linear arrangement's need for additional ground space to accommodate the coupling capacitor's return line. This saves space while also improving the system's overall stability and reliability.

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

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

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

[0064] In this embodiment, a fence 70 is designed and installed outside the coil assembly to provide protection and isolation, ensuring 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 fence 70 is set at 10.5 meters. This distance is selected based on multiple factors, including equipment safety, electromagnetic interference control, and operational stability. A suitable distance effectively prevents electromagnetic interference generated during the operation of the series reactor, ensuring proper operation of the line series reactor. It also ensures a sufficient safe distance between operators and the equipment to avoid potential hazards.

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

[0067] The width of the enclosure 70 is 34.5 meters. This width is sufficient to accommodate the entire string reactor system and provide ample space for equipment maintenance and operation. The width is designed appropriately to maintain sufficient space for personnel operation during operation and maintenance.

[0068] Fence 70 is 88.5 meters long. This length is designed to encompass the entire area where the four-coil series reactor system is located. This size not only effectively surrounds the reactor system but also provides ample space for all necessary electrical connections and protective equipment.

[0069] The layout and design of enclosure 70 are closely integrated with the arrangement of the four-coil series reactor. Installing enclosure 70 outside the equipment not only enhances the safety of the reactor system but also facilitates maintenance and repair. The size and location of enclosure 70 ensure ample clearance around the equipment for operation, minimizing the impact of the external environment on reactor operation.

[0070] The rational design of the enclosure 70 effectively isolates potential electromagnetic interference, ensuring efficient and stable operation of the series reactor system and providing a safe working environment for operators. In actual application, this enclosure 70 design fully considers the actual use requirements of the equipment, providing convenience and safety for system installation, maintenance, and operation.

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

[0072] In one embodiment, if Figure 5 As shown, a coupling capacitor 50 is connected between the first coil 10 and the fourth coil 40. This design's key function is to couple the line current and reduce its peak value, suppressing excessive transient recovery voltages (TRVs) in the circuit breaker equipment on both sides of the line, further improving line stability and safety. The coupling capacitor 50's primary function 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, resulting in a more stable and efficient system.

[0073] In one embodiment, if Figure 5As shown, the above-mentioned line is connected to a lightning arrester 60. The function of the lightning arrester 60 is to protect the line and equipment from lightning strikes or voltage surges. By installing the lightning arrester 60 in a suitable location, it can effectively absorb external overvoltages and prevent power equipment from malfunctioning due to voltage surges. The use of the lightning arrester 60 is particularly important in 500kV high-voltage lines due to the high voltage characteristics of the system. It can ensure the safe operation of the system and prevent equipment damage and power outages caused by power overloads or sudden failures.

[0074] In one embodiment, 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 coils.

[0075] The comprehensive benefits of this design are:

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

[0077] The coupling capacitor 50 is used to suppress the problem of excessive transient recovery overvoltage TRV of the circuit breaker equipment on both sides of the line, thereby ensuring the stability of the power system.

[0078] The square layout and effective electrical connection method reduce wiring complexity and equipment space, and improve system operation efficiency.

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

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

[0081] In one embodiment, the capacity of the series inductor 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. At this time, the distance between the coils and the size of the fence 70 also need to be adjusted accordingly to ensure the stable operation of the system; specifically, a highly conductive material (such as copper or aluminum alloy) is used to increase the current carrying capacity of each coil. Using a larger cross-section wire can reduce the loss when the current passes through the coil. The reactance value is increased by increasing the diameter of the coil or increasing the number of turns of the coil. Large-sized coils can increase the alternating 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 unnecessary electrical interference is not caused. The size of the fence 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 layout ensure flexible assembly and disassembly of modular units. Within the modular system, redundancy, such as the provision of backup modules, is considered to ensure rapid system recovery in the event of a failure, minimizing power outages.

[0083] In one embodiment, for high humidity environments, materials with stronger corrosion resistance, 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 waterproof and dustproof, for example, by encapsulating it in a waterproof shell or increasing the protection level (IP level). A sealing design is adopted or waterproof gaskets are added to enhance the adaptability of the equipment. In high temperature environments, strong cooling devices, such as air cooling or water cooling systems, can be used to ensure that the temperature of the equipment is maintained within a normal range. In addition, thermistors and temperature monitoring equipment can be added to automatically adjust the operating temperature. By optimizing the design of the fence 70 and the bracket, it can be adapted to different environmental conditions, such as using materials with a lower thermal expansion coefficient in low or high temperature environments.

[0084] In one embodiment, sensors such as temperature, humidity, current, voltage, and vibration 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 a wireless or wired network. A monitoring system is established on a cloud platform or within a local area network to achieve remote monitoring and alarms. The system can automatically diagnose equipment failures and alert operation and maintenance personnel to handle them. Utilizing big data analysis and machine learning algorithms, the operating trends of the equipment are analyzed, potential equipment failure points are warned in advance, and intelligent prediction and maintenance are performed. Intelligent control functions are integrated into the monitoring system to automatically adjust the operating status of the reactor based on sensor data, such as adjusting the current and adjusting the operation of the cooling system.

[0085] Through these technical solutions, we can ensure that the system can operate stably and maintain flexibility and scalability in environments with different requirements, while improving the adaptability, intelligent management capabilities and maintenance convenience of the equipment.

[0086] The above system meets the installation requirements of series reactors in the middle of 500kV transmission lines. Based on the GVar-level 6000A large-capacity 500kV line series reactor design, four 7Ω coils are connected in series and configured as a dry hollow structure. The four coils are arranged in a square shape, and the line is introduced into the first coil 10 through the tube bus, and then passes through the second and third coils 30 in sequence, and finally output to the line by the fourth coil 40. In the square arrangement scheme, the first and fourth coils 40 are arranged adjacent to each other, which is convenient for parallel coupling capacitors 50 at the entry and exit positions of the tube bus. The wiring diagram of the design scheme proposed by the present invention and the four-coil square arrangement diagram are shown as follows: Figure 5 and Figure 6 As shown:

[0087] Considering the overall dimensions and weight of the string reactor, the transport road width is 4.5 meters, the turning radius of the crane 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 configurations. It can be used as a standard module for series reactor stations in the middle of 500kV transmission lines. It is also suitable for applications where four-coil series reactors are required at substations at the end of 500kV transmission lines or between 500kV busbar sections in substations.

[0089] The system cleverly utilizes a four-coil square layout, placing the head and tail coils adjacent to each other, allowing for the arrangement of coupling capacitors without adding additional ground. This makes the layout more neat and compact, saves floor space, and facilitates daily operation and maintenance.

[0090] The four-coil 500kV line series reactor adopts a square layout, optimizing equipment layout and improving overall design efficiency. This effectively overcomes the lack of adaptability of conventional 500kV line series reactor layouts to four-coil series reactors, adapting to four-coil 500kV line series reactors of varying capacities and layouts. This solution is applicable not only to central series reactor stations but also to terminal substations or installation requirements between 500kV busbar sections. Furthermore, the square layout enables the installation of coupling capacitors, resulting in a more compact layout, reduced floor space, and easier maintenance.

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

[0092] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention 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 the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A four-coil 500kV line series impedance arrangement system, characterized in that: The invention comprises a coil group, wherein the coil group comprises a first coil, a second coil, a third coil and a fourth coil, wherein the first coil, the second coil, the third coil and the fourth coil are arranged in a positive direction, and the line of the series inductor is introduced into the first coil through a tube bus, 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 the series inductor is a dry hollow type.

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

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

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

6. The four-coil 500kV line series impedance arrangement system according to claim 1, characterized in that: Also included is a fence located outside the coil assembly.

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

8. The four-coil 500kV line series impedance arrangement system according to claim 6, characterized in that: The width of the fence is 34.5m; the length of the fence is 88.5m.

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

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

11. The four-coil 500kV line series impedance arrangement system according to claim 1, characterized in that: Two ends of the first coil, the second coil, the third coil and the fourth coil are respectively connected in parallel with voltage-limiting lightning arresters.

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