Dynamic and static end resistor of ultrahigh-voltage circuit breaker

Abstract

The invention discloses an ultrahigh-voltage circuit breaker moving and static end resistor which comprises an insulating pull rod, two connecting seats which are axially connected to the rod surfaces of the two ends of the insulating pull rod in a limited mode respectively, a plurality of resistor ring pieces arranged on the insulating rod surfaces in a sleeving mode and a plurality of wavy aluminum foil buffer ring pieces. And each aluminum foil buffer ring sheet is sleeved on the insulating rod surface and is elastically supported between two adjacent resistor ring sheets. According to the invention, continuous elastic support is provided between the adjacent resistor ring sheets through the aluminum foil buffer ring sheets, so that mechanical vibration and impact energy are effectively absorbed and buffered, and the technical problems that the resistor sheets are easily subjected to rigid collision and fragmentation due to lack of systematic buffer design in the existing closing resistor, and then electrical parameters and insulation safety are influenced are solved. According to the structure, the mechanical reliability and stability of the resistor unit in transportation, operation and long-term operation are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission and transformation equipment technology, and more specifically to a dynamic and static terminal resistor of an ultra-high voltage circuit breaker. Background Technology

[0002] In the field of power transmission and transformation equipment, high-voltage gas-insulated metal-enclosed switchgear (GIS) is a key piece of equipment for ensuring the safe and stable operation of the power grid. Among these, the high-voltage circuit breaker, as a core component, is significantly affected by operational overvoltages during its closing process, which pose a considerable threat to the system's insulation safety. To suppress such overvoltages, the industry commonly employs a solution of connecting a closing resistor in parallel at the circuit breaker's contact point. This resistor is connected to the system in advance during the closing process, absorbing and dissipating the overvoltage energy, converting it into heat energy. This effectively dampens electromagnetic oscillations and limits the overvoltage amplitude, a technology particularly crucial in ultra-high voltage and extra-high voltage applications.

[0003] Currently, the closing resistor of a high-voltage circuit breaker is typically composed of multiple resistor elements made of brittle materials (such as nonlinear resistive materials) connected in series or parallel, and assembled near the arc-extinguishing chamber through a certain support and connection structure. However, existing closing resistor structures still face significant challenges in practical applications: First, the resistor elements themselves are highly brittle and have limited mechanical strength; second, circuit breakers experience strong mechanical vibrations and impacts during transportation, on-site installation, and especially during opening and closing operations; third, the combined effect of electrodynamics and mechanical vibrations during long-term operation continuously applies dynamic stress to the resistor components. Traditional resistor structures often lack systematic buffering and vibration-resistant designs when dealing with these complex operating conditions, leading to hard collisions and friction between resistor elements, resulting in debris, cracks, and even breakage. These mechanical damages not only alter the electrical parameters of the resistor and affect overvoltage limiting performance, but more seriously, the generated conductive particles may trigger internal discharges, directly threatening the overall insulation reliability and operational safety of the GIS (Gas Insulation System). Therefore, ensuring the high reliability and long lifespan of the closing resistor structure in harsh mechanical and electrical environments has become a pressing technical challenge in this field.

[0004] While existing technologies focus on the electrical and thermal properties of resistors, they still fall short in improving their overall mechanical robustness, particularly in structural protection against vibration and shock.

[0005] Therefore, how to provide a new assembly structure for the dynamic and static terminals of an ultra-high voltage circuit breaker that ensures high mechanical reliability of the resistor elements during transportation, operation, and running, while also optimizing its overall structure to improve assembly stability, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a dynamic and static terminal resistor for an ultra-high voltage circuit breaker, which aims to solve the technical problems of insufficient mechanical reliability of the closing resistor when facing vibrations during transportation, operation and operation, as well as the need to improve the connection stability and long-term operational safety of the overall structure under impact loads.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A resistor string, comprising: Insulating tie rod; The connecting seats are axially limited and connected to the rod surfaces near both ends of the insulating rod. The rod surface of the insulating rod located between the two connecting seats is the mounting rod surface. Multiple resistor rings are fitted together on the surface of the insulating rod. The wavy aluminum foil buffer rings are fitted together on the surface of the insulating rod, and each aluminum foil buffer ring is elastically supported between two adjacent resistor rings.

[0008] Therefore, this invention, by employing a structure that combines an insulating tie rod, a connecting seat, resistor rings, and a corrugated aluminum foil buffer ring, elastically supports the aluminum foil buffer rings between every two adjacent resistor rings. This effectively buffers the rigid contact and collision of the resistor rings under vibration and impact loads, thereby significantly improving the overall vibration resistance and mechanical reliability of the resistor string, reducing the risk of resistor ring breakage due to vibration, and enhancing the stability and safety of the structure during transportation, operation, and long-term operation.

[0009] Preferably, it also includes a buffer sleeve, which is fixedly fitted onto the mounting rod surface, and its outer surface contacts and abuts against the inner ring surface of the resistor ring and the aluminum foil buffer ring.

[0010] Preferably, it also includes a compression spring, which is elastically supported between the opposite surfaces of the connecting seat and the resistor ring.

[0011] A resistor pre-assembly assembly includes a resistor series one, a resistor series two, a resistor series three, a connecting cap, and a connecting strip. Resistor string one, resistor string two, and resistor string three are all the resistor strings mentioned above; The open end of the connector cap is fixedly connected to the connector corresponding to resistor series one. A connector plate one is fixedly connected to the outer surface of the connector cap. The connector plate one is fixedly connected to the connector corresponding to resistor series two. One end of the connecting strip is fixedly connected to the connecting plate, and the other end of the connecting strip is fixedly connected to the resistor series three.

[0012] Therefore, this invention, by employing a combined structure of resistor series one, resistor series two, resistor series three, connecting cap, and connecting strip, connects multiple resistor series in parallel into a pre-assembled assembly. Furthermore, the rigid connection between the connecting cap and connecting strip achieves stable connection and coordinated support between the resistor series, effectively improving the installation rigidity and overall impact resistance of the assembly on the circuit breaker line. This enhances the structural integrity and electrical connection reliability of the resistor pre-assembled assembly under complex operating conditions.

[0013] Preferably, the connecting cap is fastened to resistor string one, the connecting plate one is fastened to resistor string two, and the connecting strip is fastened to resistor string three by bolts.

[0014] Preferably, a shielding cover is fixedly fitted on the outside of the connectors at both ends of resistor series two and resistor series three.

[0015] Preferably, there are two sets of connecting caps and connecting strips, which are symmetrically arranged on both sides of the axial center of the resistor series.

[0016] An ultra-high voltage circuit breaker includes a stationary resistor, a moving resistor, a stationary resistor, and a moving resistor. The stationary resistor and the moving resistor are pre-assembled components of the above resistors. The stationary resistor is installed on line one behind the stationary resistor, and the moving resistor is installed on line two behind the moving resistor.

[0017] Therefore, by setting the stationary and moving resistors as the aforementioned resistor pre-assembly components and installing them on the lines behind the stationary and moving contacts of the resistors, the present invention enables the resistor structure to be connected to the system nearby and bear the mechanical and electrical loads of the stationary and moving ends during the circuit breaker closing process. Thus, while suppressing operational overvoltage, the overall vibration resistance and buffering design of the pre-assembly components significantly improves the structural stability and operational safety of the stationary and moving resistors during circuit breaker opening and closing and long-term operation.

[0018] Preferably, a second connecting plate is also fixedly connected to the connecting cap, and the second connecting plate is fixedly connected to the mounting base reserved on the line.

[0019] Preferably, there are two stationary resistors and two moving resistors, which are symmetrically arranged on both sides of their respective lines.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a dynamic and static terminal resistor for an ultra-high voltage circuit breaker, which has the following beneficial effects: Enhanced vibration resistance of the basic unit: By introducing corrugated aluminum foil buffer rings, which elastically support each pair of adjacent resistor rings, vibration and impact energy generated during transportation, switching operations, and long-term operation is effectively absorbed. This design avoids hard collisions and friction between resistor rings, fundamentally reducing the risk of cracks, debris, or even breakage in brittle resistor materials. This significantly improves the mechanical reliability and service life of the resistor unit itself, laying a solid foundation for the stable operation of the entire resistor structure.

[0021] Enhanced overall component stability: Multiple resistor strings are rigidly connected into a single unit via connecting caps and connecting strips. This modular, pre-assembled design not only facilitates installation and maintenance but, more importantly, forms a robust mechanical support framework. This structure effectively transfers and distributes external loads, suppresses relative displacement of the individual resistor strings, thereby significantly improving the structural integrity and connection reliability of the entire resistor assembly under complex circuit breaker operating conditions, ensuring the continuity of electrical connections.

[0022] System integration and operational safety optimization: The aforementioned highly reliable pre-assembled resistor components are integrated into the stationary and moving main circuits of the circuit breaker, respectively, and arranged adjacent to the resistor contacts. This layout allows the closing resistor to be quickly and effectively connected to the system to suppress operational overvoltages. Simultaneously, thanks to the buffer design of the underlying resistor string and the robust connection of the overall components, this assembly structure can withstand the severe mechanical and electrodynamic shocks caused by the opening and closing of the stationary and moving ends, thus ensuring the high reliability and long-term operational safety of the circuit breaker during overvoltage suppression at the system level. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 The attached figure is a schematic diagram of a resistor string structure provided by the present invention; Figure 2 The attached figure is a partial cross-sectional view of a resistor string provided by the present invention; Figure 3 for Figure 2 Enlarged view of section A in the middle; Figure 4 The attached figure is a structural schematic diagram of a resistor pre-assembly assembly provided by the present invention; Figure 5 The attached figure is a schematic diagram of the structure of the dynamic and static terminal resistors of an ultra-high voltage circuit breaker provided by the present invention; Figure 6 The attached figure is a schematic diagram of the assembly of the stationary resistor and line one provided by the present invention.

[0025] Wherein: 1-Resistor series one; 2-Resistor series two; 3-Resistor series three; 4-Connecting cap; 5-Connecting strip; 6-Shielding cover; 7-Resistor stationary contact; 8-Resistor moving contact; 11-Insulating pull rod; 12-Connecting seat; 13-Resistor ring; 14-Aluminum foil buffer ring; 15-Buffer sleeve; 16-Compression spring; 17-Pin connector; 41-Connecting plate one; 42-Connecting plate two; 71-Stationary resistor; 72-Line one; 81-Moving resistor. Detailed Implementation

[0026] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1; See appendix Figure 1 To be continued Figure 3 The present invention discloses a resistor string, comprising: an insulating pull rod 11, a connecting seat 12, a resistor ring 13, and a wavy aluminum foil buffer ring 14; Two connecting seats 12 are axially limited and connected to the rod surface of the insulating rod 11 near its two ends, and the rod surface of the insulating rod 11 located between the two connecting seats 12 is the mounting rod surface; Multiple resistor rings 13 are fitted together on the surface of the insulating rod; Multiple aluminum foil buffer rings 14 are fitted onto the surface of the insulating rod, and each aluminum foil buffer ring 14 is elastically supported between two adjacent resistor rings 13.

[0028] Specifically, it also includes a pin connector 17. The insulating pull rod 11 has a pin hole 1 radially opened on the side wall near both ends. The connecting seat 12 is cylindrical. The connecting seat 12 has an insertion hole that passes through both ends and is inserted into the rod surface of the insulating pull rod 11. The connecting seat 12 has a pin connection position in the radial direction. The pin connection position includes a pin hole 2 and a threaded hole located on both sides of the axis of the connecting seat 12. The pin hole 2 and the pin hole 1 have the same diameter. The pin connector 17 is cylindrical, and its side wall near the bottom end has a thread that passes through its bottom end. The bottom end of the pin connector 17 passes through the pin hole 2 and the pin hole 1 and is spirally connected to the threaded hole. The cylindrical surface of the pin connector 17 is pinned to the pin hole 2 and the pin hole 1.

[0029] In this embodiment, a buffer sleeve 15 is also included. The buffer sleeve 15 is fixedly fitted onto the mounting rod surface, and its outer surface contacts and abuts against the inner ring surfaces of the resistor ring 13 and the aluminum foil buffer ring 14. Thus, by adding a buffer sleeve 15 fixedly fitted onto the mounting rod surface, and ensuring that its outer surface contacts and abuts against the inner ring surfaces of the resistor ring 13 and the aluminum foil buffer ring 14, a stable radial support interface is provided for the resistor ring 13 and the aluminum foil buffer ring 14, further reducing the possible micro-friction and collisions between them and the insulating pull rod 11, and enhancing the buffer uniformity and long-term operational reliability of the internal structure.

[0030] Specifically, the material of the buffer sleeve 15 is polytetrafluoroethylene.

[0031] In one embodiment, a compression spring 16 is also included, which is elastically supported between the opposing surfaces of the connecting seat 12 and the resistor ring 13. Thus, by adding the compression spring 16, which is elastically supported between the opposing surfaces of the connecting seat 12 and the resistor ring 13, a continuous axial preload is provided for the entire resistor string assembly.

[0032] The specific principle of the resistor string provided in this embodiment is as follows: The operating principle of this resistor string lies in its hierarchical buffering and axial constraint mechanism. The insulating tie rod 11 serves as the core load-bearing and insulating skeleton, providing the structural foundation for the entire string. The connecting seats 12 at both ends realize the axial limitation of the internal components. The core buffering function is achieved by the corrugated aluminum foil buffer rings 14, which are sleeved on the insulating tie rod 11 and pressed between every two adjacent resistor rings 13 by a pre-tightening force. When external vibration or impact load is transmitted to the string, the corrugated aluminum foil buffer rings 14, with their elastic deformation capability, can effectively absorb and dissipate energy, transforming the rigid collision between the resistor rings 13 into flexible compression and rebound, thereby avoiding the breakage of brittle resistor materials caused by direct impact. The optional buffer sleeve 15 provides a flexible radial support interface for the resistor ring 13 and the aluminum foil buffer ring 14, further isolating fretting wear; while the compression spring 16 provides continuous axial preload to compensate for thermal expansion and contraction or wear gaps, ensuring that the buffer system is always in an effective working state. Through this series of designs, the resistor string maintains the stability of the electrical connection and the integrity of the structure in harsh mechanical environments.

[0033] Example 2; See appendix Figure 4 The present invention discloses a resistor pre-assembly assembly, including resistor series 1, resistor series 2, resistor series 3, connecting cap 4, and connecting strip 5; Resistor string 1, resistor string 2, and resistor string 3 are all the resistor strings mentioned above; The open end of the connector cap 4 is fixedly connected to the connector 12 corresponding to the resistor series 1. A connector plate 41 is fixedly connected to the outer surface of the connector cap 4. The connector plate 41 is fixedly connected to the connector 12 corresponding to the resistor series 2. One end of the connecting strip 5 is fixedly connected to the connecting plate 41, and the other end of the connecting strip 5 is fixedly connected to the resistor series 3.

[0034] In this embodiment, the connecting cap 4 is fastened to resistor string 1, the connecting plate 41 is fastened to resistor string 2, and the connecting strip 5 is fastened to resistor string 3 by bolts.

[0035] In one embodiment, a shielding cover 6 is fixedly fitted onto the outside of the connector 12 at both ends of resistor series 2 and resistor series 3. Thus, by fixing the shielding cover 6 onto the outside of the connector 12 at both ends of resistor series 2 and resistor series 3, effective electric field shielding and physical protection are provided for the critical electrical connection ends. The shielding cover 6 can uniformly distribute the electric field at the ends, prevent corona discharge, and block the intrusion of external foreign objects, thereby improving the electrical insulation performance and environmental adaptability of the component.

[0036] In some embodiments, the number of connecting caps 4 and connecting strips 5 is two sets, which are symmetrically arranged on both sides of the axial center of the resistor series 1.

[0037] The specific principle of the resistor pre-assembly assembly provided in this embodiment is as follows: The principle of this pre-assembly assembly is to realize the modular integration and mechanical coordination of multiple resistor strings through a rigid connection architecture. The assembly consists of three basic buffer units: resistor string 1, resistor string 2, and resistor string 3. The connecting cap 4, as a key connecting component, has its open end fixed to the connecting seat 12 of resistor string 1, and its outer surface connecting plate 41 is connected to the connecting seat 12 of resistor string 2. The connecting strip 5 then acts as a bridge, connecting the connecting plate 41 and resistor string 3 in parallel. A detachable rigid connection is achieved through fasteners such as bolts, mechanically and electrically connecting the three originally independent resistor strings into a single, stable triangular support frame. When the entire component is subjected to external loads (such as vibration and electrodynamics), the load is transmitted and dispersed through the rigid structure formed by the connecting cap 4, connecting plate 41 and connecting strip 5, which avoids excessive stress concentration on a single resistor string. This greatly improves the installation rigidity, impact resistance and deformation resistance of the entire component on the main circuit of the circuit breaker, and ensures the structural stability and electrical reliability of the multi-resistor parallel system in long-term operation.

[0038] Example 3; See appendix Figure 5 To be continued Figure 6This invention discloses a dynamic and static end resistor for an ultra-high voltage circuit breaker, including a static resistor 7, a dynamic resistor 8, a static end resistor 71, and a dynamic end resistor 81. The static end resistor 71 and the dynamic end resistor 81 are the aforementioned resistor pre-assembly components. The static end resistor 71 is installed on line 1 72 behind the static resistor 7, and the dynamic end resistor 81 is installed on line 2 behind the dynamic resistor 8.

[0039] In this embodiment, a second connecting plate 42 is also fixedly connected to the connecting cap 4, and the second connecting plate 42 is fixedly connected to the mounting base reserved on the line. Thus, by adding the second connecting plate 42 to the connecting cap 4 and fixing it to the mounting base reserved on the line, an additional and stable mounting support is provided for the entire resistor pre-assembly assembly.

[0040] In one embodiment, there are two stationary resistors 71 and two moving resistors 81, symmetrically arranged on both sides of their respective lines. Thus, by setting two stationary resistors 71 and two moving resistors 81, and symmetrically arranging them on both sides of their respective lines, a completely symmetrical resistor connection pattern is formed. This double symmetrical arrangement not only achieves balanced matching of electrical parameters but also ensures that the mechanical load is evenly distributed across the structure on both sides of the line, further optimizing the electric field distribution and significantly improving the mechanical redundancy and overall stability of the resistor assembly structure in the circuit breaker break area.

[0041] The specific principle of the moving and stationary end resistors of an ultra-high voltage circuit breaker provided in this embodiment is as follows: The principle of this overall assembly structure is to optimize the layout of highly mechanically reliable resistor modules on the critical path of energy generation and transmission during circuit breaker opening and closing, thereby achieving system-level integration of electrical performance and mechanical reliability. The structure defines the aforementioned resistor pre-assembly components as stationary end resistor 71 and moving end resistor 81, respectively. Stationary end resistor 71 is directly installed on line 72 behind the stationary contact 7, while moving end resistor 81 is installed on the line behind the moving contact 8. When the circuit breaker performs a closing operation, the moving contact 8 moves towards the stationary contact 7. During this process, the moving end resistor 81 and stationary end resistor 71 at both ends are pre-connected to the main circuit through the contact system, absorbing and dissipating the operational overvoltage energy in the line. This process is accompanied by significant mechanical impact and electrodynamic force. Thanks to the progressive vibration absorption of the corrugated aluminum foil buffer ring 14 in the bottom resistor string, and the overall rigid support provided by the connecting cap 4 and connecting strip 5 at the pre-assembled component level, this assembly structure can robustly withstand the severe impact at the moment of closing and the electrodynamic oscillations during long-term operation. The entire resistor structure is further anchored by fixing the connecting plate 42 to the line mounting base. Ultimately, this design ensures that while the closing resistor accurately fulfills its electrical damping function, its structure maintains extremely high reliability and safety during dynamic opening and closing processes and long-term operation, thereby guaranteeing the insulation performance and service life of the ultra-high voltage circuit breaker at the system level.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A resistor string, characterized in that, include: Insulating tie rod (11); Connecting seat (12), two connecting seats (12) are axially limited and connected to the rod surface of the insulating rod (11) near its two ends respectively, and the rod surface of the insulating rod (11) located between the two connecting seats (12) is the mounting rod surface; Resistor rings (13), and multiple resistor rings (13) are fitted together on the surface of the insulating rod; A wavy aluminum foil buffer ring (14) is fitted onto the surface of the insulating rod, and each aluminum foil buffer ring (14) is elastically supported between two adjacent resistor rings (13).

2. A resistor string according to claim 1, characterized in that, It also includes a buffer sleeve (15), which is fixedly sleeved on the mounting rod surface, and its outer surface contacts and abuts against the inner ring surface of the resistor ring (13) and the aluminum foil buffer ring (14).

3. A resistor string according to claim 1, characterized in that, It also includes a compression spring (16) that is elastically supported between the opposite surfaces of the connecting seat (12) and the resistor ring (13).

4. A resistor pre-assembled assembly, characterized in that, It includes resistor series one (1), resistor series two (2), resistor series three (3), connecting cap (4) and connecting strip (5); The resistor string one (1), resistor string two (2) and resistor string three (3) are all resistor strings as described in any one of claims 1 to 3; The open end of the connecting cap (4) is fixedly connected to the connecting seat (12) corresponding to the first resistor string (1), and the outer surface of the connecting cap (4) is fixedly connected to the connecting plate (41), and the connecting plate (41) is fixedly connected to the connecting seat (12) corresponding to the second resistor string (2). One end of the connecting strip (5) is fixedly connected to the connecting plate (41), and the other end of the connecting strip (5) is fixedly connected to the resistor series (3).

5. A resistor pre-assembled assembly according to claim 4, characterized in that, The connecting cap (4) is fastened to the resistor series one (1), the connecting plate one (41) is fastened to the resistor series two (2), and the connecting strip (5) is fastened to the resistor series three (3) by bolts.

6. A resistor pre-assembly assembly according to claim 4, characterized in that, A shield (6) is fixed on the outside of the connecting seat (12) located at both ends of the resistor string two (2) and the resistor string three (3).

7. A resistor pre-assembly assembly according to claim 4, characterized in that, The number of the connecting cap (4) and the connecting strip (5) are two sets, which are symmetrically arranged on both sides of the axial center of the resistor series (1).

8. A dynamic and static terminal resistor of an ultra-high voltage circuit breaker, characterized in that, It includes a stationary resistor (7), a moving resistor (8), a stationary resistor (71), and a moving resistor (81). The stationary resistor (71) and the moving resistor (81) are resistor pre-assembly components as described in any one of claims 4 to 7. The stationary resistor (71) is installed on line one (72) behind the stationary resistor (7), and the moving resistor (81) is installed on line two behind the moving resistor (8).

9. The dynamic and static terminal resistors of an ultra-high voltage circuit breaker according to claim 8, characterized in that, A second connecting plate (42) is also fixedly connected to the connecting cap (4), and the second connecting plate (42) is fixedly connected to the mounting base reserved on the line.

10. The dynamic and static terminal resistors of an ultra-high voltage circuit breaker according to claim 8, characterized in that, The number of stationary resistors (71) and moving resistors (81) is two, and they are symmetrically arranged on both sides of their respective lines.

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