Damping resistor and cable line charge discharge device for compact GIS

Abstract

The application belongs to the technical field of power system protection and safe operation, and discloses a damping resistor for compact GIS and a cable line charge discharge device. The resistor module composed of multiple series resistors is arranged in the tank, and the two ends are connected by shielding covers and insulating pots, so that the integration packaging of the high damping resistor is realized. In the resistor, the series resistor structure disperses the voltage stress, the shielding cover uniformizes the electric field, and the insulating part prevents short circuit. The compact design ensures high resistance while greatly reducing the volume. The resistor effectively solves the bottleneck of large volume of damping resistor in the large-capacity cable line without high resistance, provides sufficient damping to suppress LC oscillation, accelerates the discharge of residual charge, avoids the damage of voltage transformer caused by impact current, and thus improves the system safety and recovery efficiency, and adapts to emerging working condition requirements.

Description

Technical Field

[0001] This invention belongs to the field of power system protection and safe operation technology, and particularly relates to a compact damping resistor for GIS and a cable line charge discharge device. Background Technology

[0002] With the rapid development of emerging high-capacitance-density scenarios such as modern urban power grids and offshore wind power transmission, high-voltage / ultra-high-voltage long-distance cables are increasingly widely used in power transmission and have become a key component of power systems. Similar to the principle that capacitors need time to discharge after charging in daily life, long-distance cables (usually over 5km in length) are equivalent to giant "capacitors." After a power outage, a large amount of charge remains inside. If this residual charge is not discharged in a timely and safe manner, it will cause a series of safety risks such as reclosing misjudgment, electric shock to maintenance personnel, and insulation breakdown of power equipment, seriously threatening the stable operation of the power system and the personal safety of maintenance personnel. Therefore, the efficient and safe discharge of residual charge has become an important technical requirement in the operation and protection of high-voltage / ultra-high-voltage long-distance cable lines.

[0003] Currently, the traditional method for residual charge discharge in the industry is to install parallel reactors in cable lines. However, this method is not suitable for large-capacity cable lines without reactors. For such large-capacity cable lines without high-reactor capacity, conventional electromagnetic voltage transformers will experience huge inrush currents during residual charge discharge, which can easily lead to inter-turn short circuits or complete burnout. This not only results in the loss of voltage measurement function but may also cause secondary safety accidents. To protect voltage transformers, the industry has attempted to add discharge coils in parallel at the voltage transformers at the end of the line to reduce the discharge current. However, pure inductive discharge circuits are prone to LC oscillations with the cable-to-ground capacitance, which not only prolongs the charge discharge time and delays the system recovery process but also exacerbates equipment stress due to repeated current oscillations. Existing technologies lack systematic design and parameter matching methods for "large-capacity long cables + no high-reactor capacity" conditions, failing to meet the adaptability and safety requirements of emerging scenarios.

[0004] In summary, existing technologies cannot effectively solve the problems of equipment protection and oscillation suppression during the residual charge discharge process of long-distance cable lines without high resistance and large capacity. Summary of the Invention

[0005] This invention provides a compact damping resistor for GIS and a cable line charge discharge device. The use of this resistor structure can effectively solve the problems of equipment protection and oscillation suppression during the residual charge discharge process of long-distance cable lines without high impedance and large capacity.

[0006] To achieve the above objectives, the present invention employs the following technical content: A compact damping resistor for GIS includes a tank and a resistor module; Insulating basins are provided at both ends of the tank; The resistor module is disposed inside the tank and is connected to the insulating basin through cast conductors connected at both ends; The resistor module includes multiple resistors connected in series in sequence; Adjacent resistors are isolated by an insulating component; The casting conductors at both ends are respectively connected to the first and last resistors of the resistor module; The two ends of the resistor module are respectively fitted with shielding covers; The two shields are connected to the casting conductors at both ends of the resistor module.

[0007] Furthermore, the shielding cover includes multiple sequentially connected arc shielding structures; the multiple arc shielding structures are integrated into one piece through a single spinning forming process.

[0008] Furthermore, multiple support pillars are inserted between the two shielding covers; the resistor and the insulating component are both sleeved and connected to the support pillars.

[0009] Furthermore, the support column is inserted into the shielding cover via a connecting plate and fixed with a nut.

[0010] Furthermore, pressure plates are connected to both ends of the resistor module; the pressure plates are sleeved on the support column; The support column is also connected to shielding flanges at both ends, and is connected to the shielding cover through the shielding flanges. A spring is provided between at least one of the shielding flanges and the pressure plate on the corresponding side; the spring is sleeved on the support column; The pressure plate, the spring, and the nut are all located inside the shielding cover.

[0011] Furthermore, the resistors in the resistor module are arranged in strings to form one or more resistor string structures; when arranged in multiple resistor string structures, each resistor string structure is arranged in a circular, triangular or square pattern with equal spacing.

[0012] Furthermore, when arranged in a multi-resistor string structure, adjacent resistors in the same resistor string structure are electrically connected through conductors; resistors in adjacent resistor strings are electrically connected through connecting pieces.

[0013] Furthermore, the cavity of the tank is filled with insulating gas.

[0014] Furthermore, an inspection port is provided at the bottom of the tank, and the inspection port is equipped with a removable inspection cover.

[0015] A charge discharge device for cable lines without high reactance includes an upper damping resistor and a discharge coil; one end of the damping resistor is connected to the discharge end of the cable line discharge unit, and the other end is connected to the discharge coil.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a compact damping resistor for GIS (Gas Insulation System). It integrates a high-damping resistor by embedding a resistor module consisting of multiple series resistors within a housing, with shielding covers and insulating basins at both ends. In this resistor, the series resistor structure disperses voltage stress, the shielding covers uniformly distribute the electric field, and the insulating components prevent short circuits. The overall compact design significantly reduces size while ensuring high resistance. This resistor effectively solves the bottleneck of large size and difficult installation of damping resistors in high-capacity cable lines without high dielectric constant. By providing sufficient damping to suppress LC oscillations, accelerate residual charge discharge, and prevent damage to voltage transformers from inrush currents, it improves system safety and recovery efficiency, adapting to the needs of emerging operating conditions.

[0017] This invention also provides a charge discharge device for cable lines without high-resistance transformers, including the aforementioned compact damping resistor for GIS. An integrated damped discharge circuit is constructed by connecting the compact damping resistor in series with a discharge coil. The discharge coil provides a discharge path for residual charge and limits the inrush current, thereby protecting the voltage transformer from burnout. Meanwhile, the series-connected high-value damping resistor effectively dissipates circuit energy, suppresses harmful LC oscillations formed by the discharge coil and the cable-to-ground capacitance, avoids oscillation stress, and accelerates the charge discharge process. This charge discharge device systematically integrates two key components, using a compact damping resistor to solve the adaptation problem of excessively large size under high resistance values. This provides a safe, efficient, and easy-to-implement charge discharge solution for long, high-capacity cable lines without high-resistance transformers, effectively balancing equipment protection, oscillation suppression, and engineering adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a compact damping resistor for GIS provided in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the connection between the shielding cover and the casting conductor provided in an embodiment of the present invention; Figure 3 A schematic diagram of a side shield structure for a compact damping resistor for GIS provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the other side shielding structure of a compact GIS damping resistor provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a charge discharge device for cable lines without high impedance, provided as an embodiment of the present invention.

[0019] Figure label: 1. Tank body; 2. Insulating basin; 3. Cast conductor; 4. Resistor; 5. Insulating component; 6. Connecting piece; 7. Support column; 8. Pressure plate; 9. Shielding flange; 10. Shielding cover; 11. Conductor; 12. Spring; 13. Nut; 14. Connecting plate; 15. Inspection cover; 21. Cable line discharge unit; 22. Damping resistor; 23. Discharge coil. Detailed Implementation

[0020] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] The technical terms involved in this invention are explained as follows: High-capacity long cable lines: These refer to power transmission or distribution cable systems that are relatively long (usually over 5 km) and have a large capacitance. Their large capacitance to ground means that they store a high amount of electrostatic energy during power outages or circuit breakers, requiring safe discharge.

[0025] Ground capacitance: The distributed capacitance formed between the cable conductor and the ground. The longer the cable and the larger its cross-sectional area, the greater the ground capacitance, the more charge it stores, and the higher the risk of discharge.

[0026] Line tripping: refers to the operation of a circuit breaker or disconnecting switch to disconnect the circuit. If the cable is not fully discharged at this time, residual voltage may endanger equipment or personnel safety.

[0027] High-voltage reactors (HVDCs) are devices used to limit short-circuit current or absorb reactive power. In some cable systems, HVDCs can assist in discharging energy stored in capacitors; however, if HVDCs are not available, additional measures are required.

[0028] Discharge coil device: An electromagnetic device specifically designed to quickly release the residual charge of a cable after power is cut off. It is usually connected in parallel to the end of the cable and dissipates energy through an inductive circuit.

[0029] Damping resistor: A resistive element connected in series or parallel in the discharge coil circuit. Its function is to suppress oscillation, consume the energy of the discharge current, prevent the coil from burning out due to overcurrent, and accelerate the discharge process.

[0030] Coil burnout: refers to the phenomenon that the discharge coil overheats and the insulation is damaged or even melts due to a sudden large current, which is a key safety hazard that this invention aims to avoid.

[0031] Damping consumes discharge current: This refers to the conversion of electrical energy into heat energy through resistance, thereby reducing the Q value of the circuit, suppressing LC oscillation, and enabling the discharge process to be completed smoothly and quickly.

[0032] As mentioned in the background section, in power systems, long cables act like giant "capacitors." Once power is lost, a large amount of charge remains inside. If not handled promptly, this can lead to: reclosing failure (misdiagnosed as a fault); electric shock risk to maintenance personnel; and insulation breakdown of equipment. The traditional approach is to install parallel reactors to address this issue. However, for large-capacity cable lines without reactors, conventional electromagnetic voltage transformers experience enormous inrush currents during discharge, making them highly susceptible to inter-turn short circuits or complete burnout. This not only renders them ineffective but can also trigger secondary accidents. Furthermore, because pure inductive discharge circuits easily form LC oscillations with the cable-to-ground capacitance, this not only prolongs charge discharge time and delays system recovery but can also exacerbate equipment stress due to repeated current oscillations. Therefore, current technologies lack systematic design and parameter matching methods for the "large-capacity long cable + no high-reactor" operating condition.

[0033] To achieve the above objectives, this embodiment provides a compact damping resistor for GIS (Gas Insulation System). This resistor is connected in series in the discharge coil circuit. Its energy dissipation characteristics effectively suppress oscillation amplitude and limit instantaneous peak current to prevent coil overheating and burnout. Simultaneously, it accelerates energy dissipation and shortens the discharge cycle, thereby comprehensively improving the safety and reliability of the system operation and effectively ensuring the personal safety of maintenance personnel and the stable operation of power equipment. The size of this resistor is close to that of a conventional GIS busbar, allowing for flexible placement in 363kV GIS systems. Balancing high heat capacity requirements with high insulation reliability, it effectively reduces the discharge current when cutting cables and shortens cable discharge time.

[0034] For example, this embodiment provides a compact damping resistor for GIS, including a tank 1 and a resistor module; insulating basins 2 are respectively provided at both ends of the tank 1; the insulating basins 2 are installed at both ends of the tank 1 by bolts. Cast conductors 3 are fixedly installed on each of the two insulating basins 2; the two cast conductors 3 are fixedly installed at both ends of the resistor module, thereby supporting and fixing the resistor module in the center of the tank 1 cavity through the cast conductors 3. Wherein: The resistor module is composed of multiple resistors 4 connected in series to form a high-voltage resistor module; adjacent resistors 4 are physically isolated by an insulating component 5. The casting conductors 3 at both ends are respectively connected to the two resistors 4 at the beginning and end of the resistor module to realize the conduction of discharge current; shielding covers 10 are respectively fitted at both ends of the resistor module. The two shields 10 are connected to the cast conductors 3 at both ends of the resistor module.

[0035] The annular damping resistor structure for GIS provided in this embodiment will be further described in detail below with reference to the accompanying drawings: like Figure 1 As shown, this embodiment provides a compact damping resistor for GIS, specifically applied in a 363kV gas-insulated metal-enclosed equipment. It includes a tank 1 and a resistor module. The tank 1 serves as the outer shell of the entire damping resistor, providing installation and protection space for internal components. Insulating basins 2 are respectively installed at both ends of the tank 1. The insulating basins 2 serve a sealing and insulating function, effectively isolating the internal electrical connections of the tank 1 from the external environment, ensuring the insulation reliability of the equipment, and facilitating the connection of the resistor module to external circuits. The resistor module is located inside the tank 1 and connected to the insulating basins 2 via cast conductors 3 connected at both ends. The cast conductors 3 are manufactured using precision casting technology, possessing good conductivity and structural strength, capable of stably transmitting current, and simultaneously achieving a reliable connection between the resistor module and the insulating basins 2, ensuring current... Transmission stability; the resistor module includes multiple resistors 4 connected in series. The series connection of multiple resistors 4 effectively increases the overall resistance of the resistor module, meeting the requirements of 363kV high-resistance damping resistors and adapting to the charge discharge requirements of cable lines. Adjacent resistors 4 are isolated by an insulating component 5 made of epoxy glass cloth, which has a low elastic modulus and high insulation reliability, effectively preventing short circuits between adjacent resistors 4, ensuring the normal operation of the resistor module, and also providing a buffering effect to reduce mechanical wear between resistors 4. The cast conductors 3 at both ends are connected to the first and last resistors 4 of the resistor module, ensuring that current can smoothly enter the resistor module through the cast conductors 3, and after being damped by the resistors 4, it is output through the cast conductor 3 at the other end. Figure 2As shown, shielding covers 10 are respectively fitted on both ends of the resistor module. The two shielding covers 10 are connected to the cast conductors 3 at both ends of the resistor module. The shielding covers 10 can shield the electric field at both ends of the resistor module, avoid excessive concentration of electric field at the ends, improve the high voltage insulation performance of the equipment, and ensure the stable operation of the equipment in a 363kV high voltage environment.

[0036] As a preferred embodiment, the shielding cover 10 includes multiple sequentially connected arc-shaped shielding structures. These multiple arc-shaped shielding structures are integrated into one piece through a one-time spinning forming process. This one-time spinning forming process ensures the structural integrity and surface smoothness of the shielding cover 10, avoiding the problem of electric field concentration caused by segmented connections. At the same time, the multi-segment arc structure design can uniformly shield the electric field of the high-voltage electrical components inside the shielding cover 10, further optimizing the electric field distribution, reducing the local electric field intensity, effectively preventing the occurrence of corona discharge, improving the shielding effect of the shielding cover 10 and the electrical reliability of the equipment, while simplifying the manufacturing process of the shielding cover 10, reducing manufacturing costs, and improving production efficiency.

[0037] Multiple support columns 7 are inserted between the two shielding covers 10. The resistor 4 and the insulating component 5 are both sleeved and connected to the support columns 7. The support columns 7 provide stable installation support for the resistor 4 and the insulating component 5, so that the resistor 4 and the insulating component 5 can be neatly arranged in a preset order to form a compact resistor module. This prevents the resistor 4 and the insulating component 5 from shifting inside the tank 1, ensuring the structural stability of the resistor module. At the same time, the setting of multiple support columns 7 can evenly distribute the weight and force of the resistor module, improve the mechanical strength of the entire device, and adapt to the compact layout requirements of GIS equipment.

[0038] like Figure 3 and Figure 4 As shown, the support column 7 is inserted into the shielding cover 10 via the connecting plate 14 and fixed with the nut 13. The connecting plate 14 connects the support column 7 and the shielding cover 10. The fixing method of the nut 13 makes the connection between the support column 7 and the shielding cover 10 more secure and reliable, while facilitating installation and disassembly. During equipment maintenance, the support column 7 can be quickly disassembled to maintain and replace the internal resistor 4 and insulation component 5, improving the convenience of equipment maintenance. At the same time, it ensures that the support column 7 will not loosen during operation, ensuring the structural stability and electrical connection reliability of the resistor module. Specifically, Figure 3 In the middle, the shielding cover 10 is installed to the shielding flange 9 by bolting through the connecting plate 14. The shielding flange 9 has threaded holes for easy installation of the support rod. The resistor 4 and the insulating component 5 are arranged alternately on the support column 7. Figure 4The shielding cover 10 on the other side is installed in the same way, but its width is increased, allowing the pressure plate 8, spring 12, and nut 13 to be placed inside, thus uniformly distributing the electric field of the internal components. The nut 13 has a central thread that connects to the support column 7, which is then connected to the shielding flange 9 via screws. This structure compresses the spring 12. After the spring 12 is compressed, the pressure plate 8 applies force to the insulating component 5 and the resistor 4. This structure ensures the reliability of the electrical connection of the resistor and prevents the resistor from shifting within the overall structure due to external forces, thus improving the resistor's vibration resistance.

[0039] The resistor module is connected to two pressure plates 8 at both ends, which are fitted onto the support column 7. The support column 7 is also connected to two shielding flanges 9 at both ends, and is connected to the shielding cover 10 through the shielding flanges 9. The shielding flanges 9 not only connect the support column 7 and the shielding cover 10, but also further optimize the electric field distribution and improve the insulation performance of the equipment. At least one shielding flange 9 is provided with a spring 12 between it and the corresponding pressure plate 8. The spring 12 is fitted onto the support column 7. The elasticity of the spring 12 can apply a constant pressure to the pressure plate 8, and then transfer the pressure to the insulating component 5 and the resistor 4 through the pressure plate 8. This constant spring compression mechanism can dynamically compensate for the deformation caused by temperature changes and other factors during the operation of the equipment, eliminate the hidden dangers of loose contact between resistors 4, increased contact resistance and local overheating, ensure the long-term reliable electrical connection between resistors 4, and prevent resistors 4 from moving in the overall structure due to external forces, improve the vibration resistance of resistors 4, and ensure the stable operation of the equipment under complex working conditions.

[0040] Explained, the resistors 4 in the resistor module are arranged in strings to form one or more resistor string structures. When arranged in multiple resistor string structures, each resistor string structure is arranged in a circular, triangular, or square pattern with equal spacing. This arrangement can make full use of the space inside the tank 1, achieving a compact layout of the resistor module. Within the limited space of the tank 1, the resistance value can be further increased to meet the requirements of high resistance values. At the same time, the equal spacing can ensure that the force on each resistor string structure is uniform and the electric field distribution is uniform, avoiding excessive concentration of local electric field, improving the electrical reliability and structural stability of the equipment, adapting to the installation requirements of different specifications of GIS equipment, and enhancing the engineering adaptability of the equipment. It should be noted that when adopting a multi-resistor string structure design, not only is the module resistor arranged in series, but the voltage difference between modules is also eliminated, thereby achieving a compact resistor arrangement.

[0041] When arranged in a multi-resistor string structure, adjacent resistors 4 in the same resistor string are electrically connected through a conductor to ensure smooth current transfer between resistors 4 in the same string and to guarantee the normal operation of the resistor string. Resistors 4 in adjacent resistor strings are electrically connected through a connecting piece 6. The connecting piece 6 can realize a reliable electrical connection between multiple resistor strings, ensuring that the entire resistor module forms a complete conductive loop. At the same time, the connection method of the connecting piece 6 is simple and reliable, easy to install and maintain, and can effectively improve the assembly efficiency and electrical connection reliability of the resistor module, further optimize the structural layout of the resistor module, and achieve a compact design.

[0042] Specifically, the cavity of tank 1 is filled with insulating gas. In this embodiment, SF6 insulating gas is preferred. SF6 insulating gas has excellent insulation and arc-extinguishing properties, which can effectively isolate the electrical components inside tank 1, avoid short circuits and corona discharge, and improve the high-voltage insulation reliability of the equipment. At the same time, SF6 gas has good sealing performance, which can maintain the sealed environment inside tank 1 and prevent external impurities from entering the inside of tank 1 and affecting the normal operation of the equipment. It is suitable for the use requirements of 363kV high-voltage environment and provides a guarantee for the stable operation of the resistor module.

[0043] As another preferred embodiment, an inspection port is provided at the bottom of the tank 1, and the inspection port is equipped with a detachable inspection cover 15. The inspection port facilitates the maintenance and repair of components such as the resistor module, support column 7, and shielding cover 10 inside the tank 1 by the staff. The detachable inspection cover 15 can play a sealing role when the equipment is working normally, preventing the leakage of insulating gas and the entry of external impurities. It can be quickly disassembled when maintenance is required, improving maintenance efficiency, reducing maintenance costs, and further improving the practicality and ease of operation and maintenance of the equipment.

[0044] Therefore, this embodiment provides a compact damping resistor for GIS, the key features of which are as follows: First, innovative functional positioning: This embodiment is the first to create a special combination structure that connects a "high-resistance damping resistor" and a "discharge coil" in series, specifically solving the problem of excessive discharge current burning out the coil in 363kV high-capacity cable lines due to the lack of high-voltage reactors.

[0045] Second, core parameter design: a high resistance value of 10000Ω was determined to accurately match the energy of the system capacitor, ensuring that the peak discharge current is reduced to a safe range. The damping resistor has a maximum current carrying capacity of 21.0A and a maximum current carrying time of 200ms. After being connected in series with the discharge coil, the current is strictly lower than the limit of the coil winding fuse current.

[0046] Third, mechanical structure innovation: a modular columnar structure with alternating stacking of "resistors and insulators" is adopted to replace the traditional integral or simple series structure, achieving a compact layout under high voltage.

[0047] Fourth, innovative connection process: introduce a constant spring clamping mechanism to dynamically compensate for deformation and eliminate the risks of loose contact between resistors, increased contact resistance, and local overheating.

[0048] Fifth, electric field optimization design: A voltage equalization, one-time spinning-formed shield is set at the end of the resistor string, and an insulating rod is set in the middle for support, which effectively improves the axial electric field distribution of the long resistor string structure and prevents the electric field at the end from being too large.

[0049] Sixth, integrated design innovation: It adopts an integrated design of gas insulation and metal enclosure, which can be directly embedded as an independent gas chamber or module of gas insulation and metal enclosure equipment, with flexible layout to meet the compact layout requirements of substations.

[0050] like Figure 5 As shown, Figure 5 This is a structural diagram of a cable line charge discharge device, specifically a schematic diagram of the working principle of a damping resistor for a compact GIS. This embodiment also provides a cable line charge discharge device without high-voltage reactors, which includes the damping resistor 22 and discharge coil 23 described in the above embodiment. One end of the damping resistor 22 is connected to the discharge terminal of the cable line discharge unit 21, and the other end is connected to the discharge coil 23. This dedicated combination structure of "high-resistance damping resistor 22 and discharge coil 23" in series specifically solves the specific problem of excessive discharge current burning out the coil in 363kV high-capacity cable lines due to the lack of high-voltage reactors. The damping resistor 22 uses a high resistance parameter of 10000Ω for precise system matching. The capacitor energy can limit the peak discharge current to below the melting limit of the discharge coil 23 from the source. The damping resistor 22 has a maximum current carrying capacity of 21.0A and a maximum current carrying time of 200ms. After being connected in series with the discharge coil 23, it is strictly lower than the melting current limit of the coil winding, completely eliminating the hidden danger of the discharge coil 23 burning out. At the same time, it can accelerate the discharge of the cable line and improve the operation safety and stability of the cable line. In addition, the damping resistor 22 adopts a gas-insulated metal-enclosed integrated design, which can be directly embedded as an independent gas chamber or module of the gas-insulated metal-enclosed equipment. The layout is flexible and adaptable to the compact layout requirements of substations, further improving the engineering adaptability and practicality of the entire charge discharge device.

[0051] In summary, compared with existing damping resistors, this invention provides a compact damping resistor for GIS and a charge discharge device for cable lines, which has the following advantages: In the existing technology, the closing resistor adopts a simple series stacking structure, which makes it difficult to increase the resistance value in a limited space and the arrangement diameter is relatively large. The traditional connection method is designed for the closing condition of the closing resistor, but lacks design for the cable discharge current, and cannot effectively prevent the discharge coil from burning out due to overcurrent.

[0052] This invention provides a compact damping resistor for GIS, specifically a 363kV 10000Ω high-resistance damping resistor. It fundamentally limits the peak discharge current to below the discharge coil's melting limit, completely eliminating the risk of coil burnout and accelerating charge discharge. More importantly, its innovative modular structure of alternating "resistor-insulator" stacking, combined with constant spring compression technology, not only optimizes the internal electric field distribution and ensures long-term reliability of electrical connections, but also features an integrated, multi-arc connection shield design. This design allows the device to meet 363kV high-voltage insulation requirements while achieving a compact structure and flexible engineering layout, perfectly solving the core deficiency in existing technologies where high insulation reliability, high mechanical stability, and engineering adaptability are difficult to balance.

[0053] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A compact damping resistor for GIS, characterized in that, Includes the tank (1) and the resistor module; Insulating basins (2) are respectively provided at both ends of the tank (1); The resistor module is installed inside the tank (1) and is connected to the insulating basin (2) through the cast conductor (3) connected at both ends; The resistor module includes multiple resistors connected in series (4). Adjacent resistors (4) are isolated by an insulating component (5); The casting conductors (3) at both ends are respectively connected to the two resistors (4) at the beginning and end of the resistor module; The two ends of the resistor module are respectively fitted with shielding covers (10); The two shields (10) are connected to the casting conductors (3) at both ends of the resistor module.

2. A compact damping resistor for GIS according to claim 1, characterized in that, The shielding cover (10) includes multiple sequentially connected arc shielding structures; the multiple arc shielding structures are integrated into one piece by a one-time spinning forming method.

3. A compact damping resistor for GIS according to claim 1, characterized in that, Multiple support columns (7) are inserted between the two shields (10); the resistor (4) and the insulating component (5) are both sleeved and connected to the support columns (7).

4. A compact damping resistor for GIS according to claim 3, characterized in that, The support column (7) is inserted into the shield (10) through the connecting plate (14) and fixed by the nut (13).

5. A compact damping resistor for GIS according to claim 4, characterized in that, The resistor module is connected to pressure plates (8) at both ends; the pressure plates (8) are sleeved on the support column (7); The support column (7) is also connected to shielding flanges (9) at both ends, and is connected to the shielding cover (10) through the shielding flanges (9); A spring (12) is provided between at least one of the shielding flanges (9) and the pressure plate (8) on the corresponding side; the spring (12) is sleeved on the support column (7); The pressure plate (8), the spring (12) and the nut (13) are all located inside the shield (10).

6. A compact damping resistor for GIS according to claim 1, characterized in that, The resistors (4) in the resistor module are arranged in strings to form one or more resistor strings; when arranged in multiple resistor strings, each resistor string is arranged in a circle, triangle or square with equal spacing.

7. A compact damping resistor for GIS according to claim 1, characterized in that, When arranged in a multi-resistor string structure, two adjacent resistors (4) in the same resistor string structure are electrically connected through a conductor; the resistors (4) in two adjacent resistor strings are electrically connected through a connecting piece (6).

8. A compact damping resistor for GIS according to claim 1, characterized in that, The cavity of the tank (1) is filled with insulating gas.

9. A compact damping resistor for GIS according to claim 1, characterized in that, The tank (1) has an inspection port at the bottom, and the inspection port is equipped with a removable inspection cover (15).

10. A charge discharge device for cable lines without high-impact dielectric, characterized in that, Includes the damping resistor (22) and discharge coil (23) as described in any one of claims 1-9; One end of the damping resistor (22) is connected to the discharge end of the cable line discharge unit (21), and the other end is connected to the discharge coil (23).

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