A transmission assembly for a fast vacuum circuit breaker and a fast vacuum circuit breaker

Abstract

This disclosure provides a transmission assembly for a fast vacuum circuit breaker and a fast vacuum circuit breaker. The transmission assembly includes: a lightweight transmission rod (2) for transmitting mechanical power to a drive mechanism (1); a current-carrying portion (10) of the transmission rod, which is a conductive structure that can move axially and is used to carry current conducted from the moving end contact (11) of the vacuum interrupter; a current-leading assembly (7) for laterally leading out current from the moving current-carrying portion (10) of the transmission rod through a conductive contact (9) and providing radial constraint. A connecting mechanism (3) is used to mechanically connect the current-leading assembly (7) to the bottom plate (8) of the vacuum interrupter; wherein the conductive contact (9) is arranged around the travel path of the current-carrying portion (10) of the transmission rod and maintains sliding or rolling electrical contact with the side of the current-carrying portion (10).

Description

Technical Field

[0001] This disclosure relates to the field of high-voltage electrical equipment technology, and in particular to a transmission assembly for a fast vacuum circuit breaker and a fast vacuum circuit breaker. Background Technology

[0002] Fast vacuum circuit breakers are widely used for fault isolation and protection in power systems. In order to achieve rapid interruption of short-circuit current, the moving contact of the circuit breaker needs to accelerate to a predetermined speed and complete the opening stroke within a very short time (usually milliseconds) after the fault occurs.

[0003] In existing technologies, a solid copper conductive rod is typically used to connect the drive mechanism and the moving contact of the vacuum interrupter. This rod simultaneously performs the dual functions of "main circuit current carrying" and "mechanical force transmission." However, due to the high current-carrying capacity requirements of high-voltage and high-current operating conditions, the conductive rod has a large diameter and heavy mass. This enormous moving mass means that the drive mechanism must output a very large instantaneous driving force when pursuing high acceleration. This not only results in a large drive mechanism with high energy consumption, but also the huge impact force can easily cause fatigue damage to mechanical components, limiting further improvements in the circuit breaker's opening speed.

[0004] The information disclosed in the Background section is only intended to enhance the understanding of the background of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the problems of large mass of moving parts in existing fast vacuum circuit breakers, which limits operating speed and places excessive power requirements on the drive mechanism, this disclosure provides a transmission assembly and a fast vacuum circuit breaker for fast vacuum circuit breakers, which effectively reduces the total mass of the moving system and facilitates the miniaturization and integration of the circuit breaker.

[0006] A drive assembly for a fast vacuum circuit breaker includes:

[0007] The lightweight transmission rod 2 is used to transmit mechanical power to the drive mechanism 1;

[0008] The current-carrying part 10 of the transmission rod is a conductive structure that can move along the axial direction and is used to carry the current conducted from the moving end contact 11 of the vacuum interrupter.

[0009] The current extraction component 7 has a conductive contact 9 inside, which is used to laterally extract current from the moving transmission rod current passage portion 10 through the conductive contact 9 and provide radial constraint.

[0010] The connecting mechanism 3 is used to mechanically connect the current lead-out assembly 7 to the vacuum interrupter bottom plate 8;

[0011] The other end of the transmission rod flow passage portion 10 is connected to the lightweight transmission rod 2; the conductive contact 9 is arranged around the travel path of the transmission rod flow passage portion 10 and maintains sliding or rolling electrical contact with the side of the transmission rod flow passage portion 10.

[0012] In the aforementioned transmission assembly, the lightweight transmission rod 2 is made of titanium alloy, high-strength aluminum alloy, or carbon fiber composite material.

[0013] In the aforementioned transmission assembly, the current-passing portion 10 of the transmission rod is a conductive copper slider or a hollow copper cylinder.

[0014] In the aforementioned transmission assembly, the outer surface of the transmission rod flow passage portion 10 that contacts the conductive contact 9 is silver-plated and hardened.

[0015] In the transmission assembly, the conductive contact 9 consists of multiple sets of annularly distributed elastic metal fingers or watch strap fingers, which are pressed against the outer surface of the transmission rod flow passage portion 10 under the action of elastic force.

[0016] In the aforementioned transmission assembly, the multiple sets of annularly distributed elastic metal fingers or watch strap fingers, while realizing current transmission, provide radial limiting and auxiliary guiding support for the moving parts.

[0017] In the transmission assembly, the connecting mechanism 3 includes a bolt, which mechanically connects the current lead-out assembly 7 to the vacuum interrupter bottom plate 8 through a threaded locking structure.

[0018] A fast vacuum circuit breaker, comprising:

[0019] Drive mechanism 1 is used to provide power for opening and closing the circuit breaker;

[0020] The vacuum interrupter includes an insulating shell 4, a bellows 5, an inner shielding cover 6, a vacuum interrupter base plate 8, and a moving end contact 11.

[0021] And, the aforementioned transmission component.

[0022] In the aforementioned fast vacuum circuit breaker, the drive mechanism 1 drives the current-passing part 10 of the transmission rod and the moving end contact 11 to perform linear motion through the lightweight transmission rod 2.

[0023] In the aforementioned fast vacuum circuit breaker, the drive mechanism 1 is an electromagnetic repulsion mechanism, a permanent magnet mechanism, or a spring-electromagnetic hybrid mechanism, suitable for high-voltage electrical equipment switching scenarios with voltage levels of 126kV and above.

[0024] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0025] This disclosure provides a transmission assembly for a fast vacuum circuit breaker and a fast vacuum circuit breaker. By using a lightweight transmission rod instead of a solid copper rod, the total mass of the motion system is significantly reduced. Under the same driving energy, the opening and closing speed and dynamic response performance of the circuit breaker are greatly improved, which is conducive to the miniaturization and integration of the circuit breaker. In addition, the use of enclosed conductive contacts to provide auxiliary guidance improves the stability of mechanical motion.

[0026] The description provided is merely an overview of the technical solution of this disclosure. To make the technical means of this disclosure clearer and more understandable, to the point that those skilled in the art can implement it according to the content of the specification, and to make the described and other objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are illustrated below. (See accompanying drawings.)

[0027] Various other advantages and benefits of this disclosure will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0028] Figure 1 This is a schematic diagram of a drive assembly for a fast vacuum circuit breaker provided in this disclosure;

[0029] Figure 2 This is a plan view of a fast vacuum circuit breaker provided in this disclosure;

[0030] Figure 3 This is a comparison chart of the displacement-time characteristic curves of the moving parts of the three motion systems before and after weight reduction in the embodiments provided in this disclosure;

[0031] Figure 4 This is a comparison chart of the velocity-time characteristic curves of the moving parts of the three motion systems before and after weight reduction in the embodiments provided in this disclosure;

[0032] Among them, 1-drive mechanism; 2-lightweight transmission rod; 3-connection mechanism; 4-insulating shell of vacuum interrupter; 5-bellows; 6-inner shield of vacuum interrupter; 7-current lead-out assembly; 8-bottom plate of vacuum interrupter; 9-conductive contact; 10-current-passing part of transmission rod; 11-moving end contact of vacuum interrupter. Detailed Implementation

[0033] The present disclosure will now be described in detail with reference to the accompanying drawings and embodiments, which are intended to explain the disclosure and not to limit it. Although specific embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0034] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions of preferred embodiments of this disclosure are for the purpose of implementing the general principles of the specification and are not intended to limit the scope of this disclosure. The scope of protection of this disclosure is determined by the appended claims.

[0035] To facilitate understanding of the embodiments of this disclosure, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments, and the accompanying drawings do not constitute a limitation on the embodiments of this disclosure.

[0036] A drive assembly for a fast vacuum circuit breaker includes:

[0037] The lightweight transmission rod 2 is used to transmit mechanical power to the drive mechanism 1;

[0038] The current-carrying part 10 of the transmission rod is a conductive structure that can move along the axial direction and is used to carry the current conducted from the moving end contact 11 of the vacuum interrupter.

[0039] The current lead-out component 7 has a conductive contact 9 inside, which is used to laterally lead current from the moving transmission rod current passage part 10 through the conductive contact 9 and provide radial constraint.

[0040] The connecting mechanism 3 is used to mechanically connect the current lead-out assembly 7 to the vacuum interrupter bottom plate 8;

[0041] The other end of the flow passage portion 10 of the transmission rod is connected to the lightweight transmission rod 2;

[0042] The conductive contact 9 is disposed around the travel path of the transmission rod flow passage portion 10 and maintains sliding or rolling electrical contact with the side of the transmission rod flow passage portion 10.

[0043] In this embodiment, by using a lightweight transmission rod instead of a solid copper rod, the total mass of the motion system is significantly reduced, and the opening and closing speed and dynamic response performance of the circuit breaker are greatly improved under the same driving energy, which is conducive to the miniaturization and integration of the circuit breaker. In addition, the use of the surrounding conductive contacts to provide auxiliary guidance improves the stability of mechanical motion.

[0044] In a preferred embodiment of the transmission assembly, the lightweight transmission rod 2 is made of titanium alloy, high-strength aluminum alloy, or carbon fiber composite material.

[0045] In a preferred embodiment of the transmission assembly, the flow passage portion 10 of the transmission rod is a conductive copper slider or a hollow copper cylinder.

[0046] In a preferred embodiment of the transmission assembly, the outer surface of the transmission rod flow passage portion 10 that contacts the conductive contact 9 is silver-plated and hardened.

[0047] In a preferred embodiment of the transmission assembly, the conductive contact 9 is a plurality of ring-shaped elastic metal fingers or watch strap fingers, which are pressed against the outer side of the flow passage portion 10 of the transmission rod under the action of elastic force.

[0048] In a preferred embodiment of the transmission assembly, the multiple sets of annularly distributed elastic metal fingers or watch strap fingers provide radial limiting and auxiliary guiding support for the moving parts while realizing current transmission.

[0049] In a preferred embodiment of the transmission assembly, the connecting mechanism 3 includes a bolt, which mechanically connects the current lead-out assembly 7 to the vacuum interrupter bottom plate 8 via a threaded locking structure.

[0050] In one embodiment, the drive assembly for the fast vacuum circuit breaker is described in [reference needed]. Figure 1 It includes: a lightweight transmission rod 2, a transmission rod current-passing part 10, a current lead-out assembly 7, and a connecting mechanism 3.

[0051] Combination Figure 2The lightweight transmission rod 2, made of a material with a density less than copper, is used to connect the drive mechanism 1 and transmit mechanical power. The current-carrying part 10 of the transmission rod is a conductive structure that can move axially and is used to connect with the lightweight transmission rod 2 to carry the current conducted from the moving end contact 11 of the vacuum interrupter. The connecting mechanism 3 is used to mechanically connect the current-leading assembly 7 to the bottom plate 8 of the vacuum interrupter. The current-leading assembly 7 has a conductive contact 9 inside, which is used to maintain electrical contact with the side of the moving current-carrying part 10 of the transmission rod through the conductive contact 9, thereby leading the current from the side of the current-carrying part 10 of the transmission rod to the external stationary circuit, and providing radial constraint on the current-carrying part 10 of the transmission rod when in contact.

[0052] In another embodiment, one end of the lightweight transmission rod 2 is connected to the drive mechanism 1, and the other end is connected to the flow passage portion 10 of the transmission rod. The lightweight transmission rod 2 mainly undertakes the function of transmitting the opening and closing driving force from the drive mechanism 1. For example, the material selected for it has a significantly lower density than copper.

[0053] In one embodiment, in order to balance the requirements of lightweight and high strength, the lightweight transmission rod 2 can preferably be made of titanium alloy, high-strength aluminum alloy or carbon fiber composite material.

[0054] In another embodiment, the current-passing portion 10 of the transmission rod is a conductive structure configured to reciprocate along its axial direction, which refers to the direction along the central axis of the lightweight transmission rod (2) and the current-passing portion (10), i.e., the linear motion direction of the moving end contact (11) for opening and closing. Its stroke is relatively short, specifically a copper slider or hollow copper cylinder with excellent conductivity. Its outer surface that slides in contact with the conductive contact 9 is usually silver-plated to reduce contact resistance and hardened to improve wear resistance.

[0055] Preferably, the connecting mechanism 3 includes bolts, and the bolts mechanically connect the current lead-out component 7 to the vacuum interrupter bottom plate 8 through a threaded locking structure, including a conductive component and a bolt that fits with the vacuum interrupter.

[0056] Preferably, the current extraction assembly 7 has a conductive contact 9 inside, which is arranged in a ring around the entire stroke path of the current-carrying part 10 of the transmission rod. When the current-carrying part 10 of the transmission rod moves, the conductive contact 9 maintains a tight sliding or rolling electrical contact with its lateral outer surface. The moving end contact 11 and the current-carrying part 10 of the transmission rod are mechanically connected by bolts. Thus, after the main circuit current is conducted from the moving end contact 11 of the vacuum interrupter to the current-carrying part 10 of the transmission rod, it is immediately extracted through the lateral conductive contact 9 to the fixed current extraction assembly 7, and then connected to the external main circuit. This lateral current-carrying design eliminates the need for the lightweight transmission rod 2 to perform a current-carrying function.

[0057] This disclosure also provides a fast vacuum circuit breaker that utilizes the above-described transmission assembly, the vacuum circuit breaker comprising:

[0058] The vacuum interrupter includes an insulating shell 4, a bellows 5, an inner shielding cover 6, a vacuum interrupter base plate 8, and a moving end contact 11.

[0059] Drive mechanism 1 is used to provide power for opening and closing the circuit breaker;

[0060] And, the aforementioned transmission assembly;

[0061] The drive mechanism 1 drives the flow passage portion 10 of the transmission rod and the moving end contact 11 to perform linear motion through the lightweight transmission rod 2 of the transmission assembly.

[0062] In a preferred embodiment of the fast vacuum circuit breaker, the drive mechanism 1 drives the current-passing part 10 of the transmission rod and the moving end contact 11 to perform linear motion through the lightweight transmission rod 2.

[0063] In a preferred embodiment of the fast vacuum circuit breaker, the drive mechanism 1 is an electromagnetic repulsion mechanism, a permanent magnet mechanism, or a spring-electromagnetic hybrid mechanism, suitable for high-voltage electrical equipment switching scenarios with voltage levels of 126kV and above.

[0064] In one embodiment, this disclosure provides a fast vacuum circuit breaker adaptable to a double-acting vacuum interrupter. The overall structure is cylindrical. See also: [link to fast vacuum circuit breaker description]. Figure 2The output shafts of the upper and lower drive mechanisms 1 are rigidly connected to the top ends of the corresponding lightweight transmission rods 2, driving them to perform linear reciprocating motion. The lower end of the lightweight transmission rod 2 is mechanically connected to the current-passing part 10 of the transmission rod, and the conductive contact 9 conducts current through the current-passing part 10 of the transmission rod by pressure fitting. The current-passing part 10 of the transmission rod is mechanically connected to the moving end contact 11 by high-strength lightweight bolts to realize the transmission of force and current. One end of the bellows 5 is welded to the moving end contact 11, and the other end is welded to the bottom plate 8 of the vacuum interrupter, allowing the transmission assembly to move axially while ensuring vacuum sealing. The connecting mechanism (3) fixes the bottom shell 8 of the vacuum interrupter and the current lead-out assembly 7 by bolts to realize the positioning of the interrupter.

[0065] In another embodiment, the current-passing portion 10 of the transmission rod and the moving end contact 11 are coaxially mechanically connected by high-strength, lightweight bolts to ensure contact pressure and coaxiality. One end of the bellows 5 is welded to the moving end contact 11, and the other end is welded to the bottom plate 8 of the vacuum interrupter, forming a sealed moving end assembly. The conductive contact 9 and the current-leading assembly 7 are brazed or crimped to form an integrated component.

[0066] The pre-installed moving end assembly, the shielding cover 6 inside the vacuum interrupter, and other components are installed into the insulating shell 4 of the vacuum interrupter. The current lead-out assembly 7 and the conductive contact 9 are inserted into the interior of the interrupter, so that the conductive contact 9 and the current-passing part 1 of the transmission rod form a circumferential pressure fit. The bottom plate 8 of the vacuum interrupter is fastened to the insulating shell 4 of the vacuum interrupter by welding, thus completing the sealing and assembly of the upper and lower interrupter units.

[0067] In another embodiment, the upper and lower vacuum interrupter units are coaxially aligned to ensure that the movement trajectories of the two moving contacts 11 are on the same straight line. The upper and lower drive mechanisms 1 are respectively located at the top and bottom of the fast vacuum circuit breaker, and their output shafts are rigidly connected to the top ends of the upper and lower lightweight transmission rods 2, respectively.

[0068] The lower ends of the upper and lower lightweight transmission rods 2 are mechanically connected to the flow passage part 10 of the transmission rod, respectively. The connecting mechanism 3 is adjusted to ensure that the axis of the upper and lower transmission rods 2 coincides with the central axis of the arc-extinguishing chamber, without jamming, and that the contact opening distance and overtravel are consistent.

[0069] Preferably, during the closing action of the fast vacuum circuit breaker, the upper and lower drive mechanisms 1 simultaneously push the lightweight transmission rod 2 to move, and the two moving end contacts 11 simultaneously move towards the center and press tightly together to form a conductive circuit. The current forms a complete path through the moving end contacts 11, the conductive contact 9, and the current lead-out assembly 7. When the opening action occurs, the upper and lower drive mechanisms 1 simultaneously pull the lightweight transmission rod 2 to move towards both ends, and the two moving end contacts 11 separate simultaneously. The arc is quickly extinguished in the vacuum environment, and the bellows 5 moves upward accordingly to maintain the vacuum seal of the arc-extinguishing chamber.

[0070] Preferably, the fast vacuum circuit breaker is also compatible with a single-acting vacuum interrupter.

[0071] Preferably, the materials and structures selected for each component of the fast vacuum circuit breaker include: the drive mechanism 1 is an electromagnetic drive mechanism; the lightweight transmission rod 2 is made of titanium alloy, high-strength aluminum alloy, or carbon fiber composite material; the connection mechanism 3 includes high-strength bolts; the insulating shell 4 is a ceramic shell; the bellows 5 is a metal bellows; the indoor shielding cover 6 is a metal shielding cover; the current lead-out component 7 is a copper current lead-out component; the vacuum interrupter bottom plate 8 is a copper vacuum interrupter bottom shell; the conductive contact 9 is a spring-loaded metal (e.g., copper or other high conductivity materials) contact finger; the current-carrying part 10 of the transmission rod is a copper contact current-carrying part; and the moving end contact 11 is a copper or copper-chromium alloy vacuum interrupter longitudinal magnetic contact.

[0072] In one embodiment, this disclosure also provides a method for driving and current extraction of a fast vacuum circuit breaker, comprising the following steps:

[0073] Step S1: Prepare a lightweight transmission rod 2, which is made of a lightweight material with a density less than that of copper, such as titanium alloy, high-strength aluminum alloy or carbon fiber composite material.

[0074] Step S2: Prepare the current-passing part 10 of the transmission rod, which is a conductive structure that can move along the axial direction, such as a conductive copper slider or a hollow copper cylinder, and its outer contact surface is silver-plated and hardened.

[0075] Step S3: Connect the other end of the flow passage portion 10 of the transmission rod to the lightweight transmission rod 2;

[0076] Step S4: Set up the current lead-out component 7, and install multiple sets of ring-shaped conductive contacts 9 inside it. The conductive contacts 9 are made of elastic metal fingers or watch strap fingers.

[0077] Step S5: Mechanically connect the current lead-out assembly 7 to the vacuum interrupter bottom plate 8 through the connecting mechanism 3;

[0078] Step S6: Fix the current lead-out component 7 so that the conductive contact 9 surrounds the travel path of the current-passing part 10 of the transmission rod and is pressed against its outer side under the action of elastic force.

[0079] Step S7: Connect the drive mechanism 1 to the lightweight transmission rod 2. The drive mechanism 1 is an electromagnetic repulsion mechanism, a permanent magnet mechanism, or a spring-electromagnetic hybrid mechanism.

[0080] Step S8: Start the drive mechanism 1, transmit mechanical power through the lightweight transmission rod 2, and drive the current-passing part 10 of the transmission rod and the moving end contact 11 to perform linear opening and closing movements;

[0081] Step S9: During the movement, maintain the sliding or rolling electrical contact between the conductive contact 9 and the side of the current-passing part 10 of the transmission rod, and guide the current from the side of the current-passing part 10 of the transmission rod to the current-leading assembly 7.

[0082] Step S10: The conductive contact 9 provides radial limiting and auxiliary guiding support to the flow passage portion 10 of the moving transmission rod.

[0083] This disclosure provides a method for transmission and current extraction in a fast vacuum circuit breaker. The mechanical power is efficiently transmitted by the lightweight transmission rod 2, and the current is transmitted through the local moving current-carrying part 10 of the transmission rod and the lateral current-guiding structure. This method significantly reduces the mass of the motion system while ensuring electrical performance and is suitable for high-voltage electrical equipment interruption scenarios at voltage levels of 126kV and above.

[0084] To further verify the dynamic performance advantages of the lightweight transmission component proposed in this disclosure, a joint simulation model based on Maxwell electromagnetic simulation and SpaceClaim multibody dynamics was constructed for comparative verification.

[0085] The maximum opening distance of the fast vacuum circuit breaker was set to 40mm. The drive circuit adopted capacitor energy storage and discharge drive, with the drive capacitor set to 10mF and the pre-charge voltage set to 1000V, i.e., the initial energy storage is 5000J. Under the premise of keeping the drive mechanism parameters and energy completely consistent, three sets of motion system models were established for comparison.

[0086] Comparative Example

[0087] This comparative example relates to a conventional transmission assembly, employing a traditional solid copper conductive rod as the transmission component (without weight reduction). This conductive rod is responsible not only for guiding the current from the vacuum interrupter to the bottom flexible connection, but also for directly bearing the mechanical tension from the bottom drive mechanism. Model calculations indicate that the total mass of its moving parts is 8.0453 kg.

[0088] Example 1

[0089] The dynamic model of this embodiment is established using the exact same simulation conditions and driving parameters as the comparative model.

[0090] This embodiment employs the lightweight transmission assembly for a fast vacuum circuit breaker described in this disclosure. This transmission assembly clearly distinguishes between mechanical transmission and electrical conduction functions. The lightweight transmission rod 2 is made of titanium alloy. Since the drive mechanism 1 operates at a high potential, this rod is directly connected to the drive mechanism, eliminating the need for additional insulated transmission links, further reducing length and weight. This component is located outside the vacuum interrupter and is rigidly connected to the moving end conductive rod 11 extending from the bellows of the vacuum interrupter via bolts. Model calculations show that the total mass of the motion system using the titanium alloy lightweight transmission rod is reduced to approximately 3.3753 kg, a weight reduction of approximately 58.0% compared to the comparative example.

[0091] Example 2

[0092] The dynamic model of this embodiment is established using the exact same simulation conditions and driving parameters as the comparative example. This embodiment employs the lightweight transmission assembly for fast vacuum circuit breakers described in this disclosure. This transmission assembly clearly distinguishes between mechanical transmission and electrical conduction functions. The lightweight transmission rod 2 is made of carbon fiber. Since the drive mechanism 1 operates at a high potential, this rod is directly connected to the drive mechanism, eliminating the need for additional insulated transmission links, further reducing length and weight. This component is located outside the vacuum interrupter and is rigidly connected to the moving end conductive rod 11 extending from the outside of the vacuum interrupter bellows via bolts. According to model calculations, the total mass of the motion system using the lightweight transmission rod made of carbon fiber is reduced to approximately 2.5054 kg, a weight reduction of approximately 68.9% compared to the comparative example.

[0093] Under the premise that the parameters of the drive mechanism and the drive energy (5000J) are completely consistent, the circuit breaker opening process of the above three models is simulated and calculated.

[0094] For a comparison of the displacement-time characteristics of the moving parts of the three motion systems before and after weight reduction, please refer to the comparison curves. Figure 3 .Depend on Figure 3 It can be seen that the slope of the displacement curve of the comparative example is relatively small, and it takes a long time to complete the 20mm stroke (i.e., half of the total opening distance). The displacement curve of Example 1 is steep. At 2.0ms, the stroke of the comparative example is only about 14mm, while the stroke of Example 2 is close to 24mm. This means that by using the transmission component disclosed herein, the breaking time of the circuit breaker can be significantly shortened, allowing the moving contact to quickly open a safe distance within the first few milliseconds of a fault.

[0095] Figure 4 Comparison of velocity-time characteristic curves of moving parts before and after weight reduction in three motion systems. Figure 4It can be seen that, after applying the same driving energy, the motion speed of the comparative system increases relatively slowly, with a peak opening speed of approximately 10.5 m / s. The response speed of the motion system in Example 1 is significantly improved, with a peak opening speed of approximately 12.4 m / s, an improvement of approximately 47.6% compared to the comparative system. The peak opening speed in Example 2 is as high as approximately 13.6 m / s, an improvement of approximately 61.9% compared to the comparative system.

[0096] In summary, the transmission component provided in this disclosure, through structural optimization and material replacement, significantly reduces the equivalent mass of the motion system while ensuring electrical current carrying capacity. Simulation experiments show that, under the same driving energy, this structure can reduce the weight of the motion component by more than 50%, increase the peak opening speed by about 40% to 60%, significantly shorten the instantaneous opening time, effectively solve the problem of slow action caused by the large moment of inertia in traditional high-voltage fast circuit breakers, and greatly improve the dynamic response performance and breaking capacity of the circuit breaker.

[0097] Although the embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this disclosure is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the teachings of this specification and without departing from the scope of protection of the claims of this disclosure, and all of these are within the scope of protection of this disclosure.

Claims

1. A drive assembly for a fast vacuum circuit breaker, characterized in that, include: Lightweight transmission rod (2) is used to transmit mechanical power to the drive mechanism (1); The current-carrying part (10) of the transmission rod is a conductive structure that can move along the axial direction and is used to carry the current conducted from the moving end contact (11) of the vacuum interrupter. The current extraction assembly (7) has a conductive contact (9) inside, which is used to laterally extract current from the moving transmission rod current passage part (10) through the conductive contact (9) and provide radial constraint; The connecting mechanism (3) is used to mechanically connect the current lead-out assembly (7) to the vacuum interrupter bottom plate (8); The other end of the transmission rod flow passage part (10) is connected to the lightweight transmission rod (2); the conductive contact (9) is arranged around the travel path of the transmission rod flow passage part (10) and maintains sliding or rolling electrical contact with the side of the transmission rod flow passage part (10).

2. The transmission assembly according to claim 1, characterized in that, Preferably, the lightweight transmission rod (2) is made of titanium alloy, high-strength aluminum alloy or carbon fiber composite material.

3. The transmission assembly according to claim 1, characterized in that, The flow passage part (10) of the transmission rod is a conductive copper slider or a hollow copper cylinder.

4. The transmission assembly according to claim 3, characterized in that, The outer surface of the transmission rod flow passage part (10) that contacts the conductive contact (9) is silver-plated and hardened.

5. The transmission assembly according to claim 1, characterized in that, The conductive contact (9) consists of multiple sets of ring-shaped elastic metal fingers or watch strap fingers, which are pressed against the outer side of the transmission rod flow passage part (10) under the action of elastic force.

6. The transmission assembly according to claim 4, characterized in that, The multiple sets of ring-shaped elastic metal contacts or watch strap contacts provide radial limiting and auxiliary guiding support for moving parts while realizing current transmission.

7. The transmission assembly according to claim 1, characterized in that, The connection mechanism (3) includes mechanical connection components such as bolts, and the bolts mechanically connect the current lead-out component (7) to the vacuum interrupter bottom plate (8) through a threaded locking structure.

8. A fast vacuum circuit breaker, characterized in that, include: Drive mechanism (1) is used to provide power for opening and closing the circuit breaker; The vacuum interrupter includes an insulating shell (4), a bellows (5), an indoor shielding cover (6), a vacuum interrupter base plate (8), and a moving end contact (11). And, the transmission assembly as described in any one of claims 1 to 8.

9. The fast vacuum circuit breaker according to claim 8, characterized in that, The drive mechanism (1) drives the flow passage part (10) of the transmission rod and the moving end contact (11) to perform linear motion through the lightweight transmission rod (2).

10. The fast vacuum circuit breaker according to claim 8, characterized in that, The drive mechanism (1) is an electromagnetic repulsion mechanism, a permanent magnet mechanism or a spring-electromagnetic hybrid mechanism, which is suitable for high voltage electrical equipment switching scenarios with voltage levels of 126kV and above.

Images