A contact transmission system and method for disconnecting switches

Abstract

This invention belongs to the field of disconnecting switches and discloses a contact transmission system and method for disconnecting switches, including a moving contact assembly, a stationary contact assembly, and a contact transmission assembly. The moving main contact and the moving arc contact of the moving contact assembly are axially movable, and the stationary arc contact of the stationary contact assembly is connected through a reset mechanism and has an arc-wrapping structure. The contact transmission assembly uses a differential transmission structure to drive the moving main contact and the moving arc contact to move at different speeds, so that when closing, the moving arc contact preferentially contacts the stationary arc contact and compresses the energy stored in the reset mechanism; when opening, the moving and stationary main contacts preferentially separate under the action of the reset mechanism. The arc-wrapping structure can prevent the arc from spreading outward when opening and closing, thereby protecting the main contact and the stationary shield from arc erosion. Using this system can significantly improve the arc extinguishing capability, reduce contact erosion and weld spatter formation, avoid fracture damage and insulation risks, and enhance the operational safety and reliability under high-parameter conditions.

Description

Technical Field

[0001] This invention belongs to the field of disconnecting switch technology, specifically relating to the field of high-voltage gas-insulated metal-enclosed switchgear, and particularly to a disconnecting switch contact transmission system and method. Background Technology

[0002] The disconnecting switch in a high-voltage gas-insulated metal-enclosed switchgear (GIS) is a key piece of equipment in the power system, mainly composed of an insulating plate, a metal housing, a moving side assembly, a stationary side assembly, and a shaft-driven assembly. During operation, the moving and stationary sides carry high voltage, while the metal housing is grounded; the two are isolated from each other by the insulating plate. The moving side assembly and the shaft-driven assembly rely on an insulating torsion bar for potential isolation and power transmission. The shaft-driven assembly drives the moving contact to move back and forth by rotating the insulating torsion bar, thus achieving closing and opening. During operation, the disconnecting switch often needs to handle the switching current transfer between the busbars and small capacitive currents. During this process, electric arcs can easily be generated at the ends of the moving and stationary contacts, potentially causing ablation of the contact or shielding surfaces. With the rapid increase in power system load demand, the rated current of GIS products has increased significantly. The rated current of 252 / 363kV products has increased from 4000A to 5000A, and that of 550~1100kV products has increased from 5000A to 8000A. According to GB / T 1985-2023 and DL / T 486-2021 standards, the bus switching current must reach 80% of the rated current (maximum 4000A). The maximum switching voltage of 800kV and 1100kV products reaches 625V, making the requirements for the opening and closing performance of disconnecting switches increasingly stringent.

[0003] Currently, when a disconnecting switch closes, the moving contact pushes the stationary piston rod to compress the spring, storing energy and storing gas in the stationary chamber. The aim is to extinguish the arc during opening using the airflow. However, given the high parameters required by standards, the arc energy is extremely large and difficult to extinguish, still burning the moving and stationary arc contacts. Since the arc contact protrudes more than other parts in this structure, the weld scars formed after burning exacerbate damage to the moving and stationary fracture surfaces, posing a serious insulation risk. Furthermore, the existing design of "using the energy storage spring to release pressure and push the piston rod to accelerate the moving contact movement to increase the opening speed during the initial opening phase" is ineffective—the arc is only generated when the moving and stationary arc contacts separate; the contact movement speed before that has no effect on arc extinguishing. Moreover, the spring has already returned to its free length at the instant the contacts separate, with no stored energy to release, thus failing to achieve the speed-up effect.

[0004] It is evident that the existing structural design of GIS disconnect switches cannot meet the opening and closing requirements under high rated current, resulting in problems such as difficulty in extinguishing electric arcs, severe contact erosion, and ineffective related speed-up designs, making it difficult to ensure operational safety. Summary of the Invention

[0005] This invention provides a contact transmission system and method for disconnecting switches. Using this system can effectively solve problems such as difficulty in extinguishing electric arcs, severe contact erosion, and ineffective related speed-up designs, thus effectively ensuring the safe operation of GIS disconnecting switches.

[0006] To achieve the above objectives, the present invention employs the following technical content:

[0007] A disconnector switch contact drive system includes: a moving contact assembly, a stationary contact assembly, and a contact drive component;

[0008] The moving contact assembly includes a moving side support and a moving contact disposed in the inner cavity of the moving side support; the moving contact includes a moving main contact that can move axially, and a moving arc contact that can move axially is disposed inside the moving main contact;

[0009] The stationary contact assembly includes a stationary side support and a stationary contact disposed in the inner cavity of the stationary side support; the stationary contact includes a stationary main contact and an axially movable stationary arc contact disposed within the stationary main contact.

[0010] One end of the stationary arc contact is connected to the stationary side support through a reset mechanism, and the other end of the stationary arc contact is provided with an arc wrapping structure, which can suppress and wrap the arc generated between the moving arc contact and the stationary arc contact.

[0011] The contact transmission assembly includes a differential transmission structure connected to the drive source;

[0012] The moving main contact and the moving arc contact are respectively connected to the differential transmission structure;

[0013] The differential transmission structure can drive the moving main contact and the moving arc contact to move axially at different speeds, so that during the closing process, the moving arc contact and the stationary arc contact contact first before the moving main contact and the stationary main contact, and store energy for the reset mechanism; during the opening process, under the action of the reset mechanism, the moving main contact and the stationary main contact separate first before the moving arc contact and the stationary arc contact.

[0014] Furthermore, the differential transmission structure includes a gear shaft;

[0015] The end of the gear shaft is provided with a double gear structure, including a first gear and a second gear, with the first gear located above the second gear;

[0016] The gear ratio between the first gear and the second gear is greater than 1.

[0017] A moving main rack is fixed to the moving main contact; a moving arc rack is fixed to the moving arc contact;

[0018] The first gear meshes with the moving main rack; the second gear meshes with the moving arc rack.

[0019] Furthermore, the gear shaft is inserted into the moving side support via a bearing;

[0020] The drive end of the gear shaft is connected to the drive source via a transmission device.

[0021] Furthermore, the moving contact assembly also includes a moving side shield and a first insulating basin;

[0022] The moving side support is fixed to the center conductor of the first insulating basin;

[0023] The moving side shield is coaxially arranged with the moving side support and is sleeved on the outside of the moving side support.

[0024] Furthermore, a guide rail groove is provided on the inner wall of the moving main contact;

[0025] The moving arc contact is slidably connected within the guide rail groove;

[0026] The top surface of the moving main contact is provided with an elongated hole;

[0027] The differential transmission structure passes through the elongated hole and is connected to the moving main contact and the moving arc contact respectively.

[0028] Furthermore, the stationary contact assembly also includes a stationary side shield and a second insulating basin;

[0029] The stationary side support is fixed to the center conductor of the second insulating basin;

[0030] The static side shield is coaxially arranged with the static side support and is sleeved on the outside of the static side support.

[0031] Furthermore, the stationary contact also includes a stationary main contact protection shield;

[0032] The stationary main contact protection shield is disposed on the outside of the stationary main contact and is fixedly connected to the stationary side support.

[0033] The end of the static main contact protection shield is made of copper-tungsten material and has a guide ring inside.

[0034] Furthermore, the reset mechanism includes a reset spring and a guide rod;

[0035] One side of the guide rod is connected to the inner wall of the stationary side support.

[0036] The reset spring is sleeved on the outside of the guide rod, and its end is connected to a static arc contact support; the static arc contact is fixedly connected to the static arc contact support.

[0037] Furthermore, the stationary arc contact includes an umbrella-shaped arc contact; the end of the umbrella-shaped arc contact is configured as a conical umbrella structure as an arc wrapping structure; the end of the conical umbrella structure is provided with a groove for the insertion of the moving arc contact.

[0038] A method for operating a disconnector contact drive system, based on the aforementioned disconnector contact drive system, includes:

[0039] During the closing process, the drive source drives the differential transmission structure, which in turn drives the moving main contact and the moving arc contact to move toward the stationary side at different speeds, so that the moving arc contact contacts the stationary arc contact before the moving main contact contacts the stationary main contact, and at the same time stores energy for the reset mechanism.

[0040] During the opening process, the drive source drives the differential transmission structure, which in turn drives the moving main contact and the moving arc contact to move away from the stationary side at different speeds. At the same time, under the reset action of the reset mechanism, the moving main contact separates from the stationary main contact before the moving arc contact separates from the stationary arc contact.

[0041] During the closing or opening process, the arc-wrapping structure suppresses and wraps the arc generated between the moving arc contact and the stationary arc contact.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] This invention provides a contact transmission system for a disconnecting switch, comprising a moving contact assembly, a stationary contact assembly, and a contact transmission component. The moving main contact and the moving arc contact of the moving contact assembly are axially movable. The stationary arc contact of the stationary contact assembly is connected via a reset mechanism and has an arc-wrapping structure. The contact transmission component uses a differential transmission structure to drive the moving main contact and the moving arc contact at different speeds. This ensures that during closing, the moving arc contact preferentially contacts the stationary arc contact and compresses the energy stored in the reset mechanism; during opening, the moving and stationary main contacts preferentially separate under the action of the reset mechanism. The arc-wrapping structure prevents the arc from escaping during the initial opening and closing phases, thus protecting the main contacts and the stationary shield from arc erosion. Using this system significantly improves arc extinguishing capability, reduces contact erosion and weld spatter formation, avoids breakage damage and insulation risks, and enhances operational safety and reliability under high-parameter conditions.

[0044] This invention also provides a method for operating a disconnector contact transmission system. Based on the aforementioned disconnector contact transmission system, this method controls the movement speed of the moving main contact and the moving arc contact using a differential transmission structure: during closing, the drive source, through the differential transmission structure, causes the moving arc contact to contact the stationary arc contact first and compresses the reset mechanism to store energy, while the moving main contact contacts later; during opening, the differential transmission, in conjunction with the reset mechanism, releases energy, causing the moving main contact to separate first, and due to the reset action of the reset mechanism, pushes the stationary arc contact, causing the moving arc contact to separate from the stationary arc contact later; simultaneously, the arc-wrapping structure suppresses the arc throughout the entire process. This method completely solves the problem of energy storage device failure, significantly improves the high-energy arc extinguishing efficiency, effectively suppresses contact erosion and weld spatter formation, avoids fracture damage and insulation degradation, and ensures opening and closing safety and equipment lifespan under high-parameter operating conditions. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of a disconnector contact transmission system provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the moving contact structure provided in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structural arrangement of the moving contact and the contact transmission assembly provided in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the stationary contact assembly structure provided in an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the contact structure for tripping provided in an embodiment of the present invention;

[0050] Figure 6 This is a schematic diagram of the contact structure for closing provided in an embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram of the arc burning position when the disconnecting switch is first switched on, provided in an embodiment of the present invention.

[0052] Figure label:

[0053] 1. Moving contact assembly; 2. Stationary contact assembly; 3. Contact transmission assembly;

[0054] 101. Moving contact; 102. Moving side support; 103. Moving side shield; 104. First insulating basin; 105. Main contact; 106. Arc contact; 107. Moving main contact; 108. Moving main rack; 109. Moving arc contact; 110. Moving arc rack; 111. Guide rail groove; 112. Long strip hole;

[0055] 201. Stationary contact; 202. Stationary side support; 203. Stationary side shield; 204. Second insulating basin; 205. Stationary main contact; 206. Stationary arc contact; 207. Stationary main contact protective shield; 208. Umbrella-shaped arc contact; 209. Stationary arc contact support; 210. Return spring; 211. Guide rod; 301. Gear shaft; 302. Transmission device; 303. Bearing; 304. First gear; 305. Second gear. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The technical terms involved in this invention will be explained below:

[0061] Disconnecting switch: An important electrical component in high-voltage switchgear. When closed, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time. It also has the ability to switch bus switching current and switch small capacitive and small inductive currents.

[0062] Moving side: The side connected to the operating mechanism, the side where the moving contact moves during the opening and closing of the disconnecting switch;

[0063] Stationary side: The side of the disconnector that remains stationary except for the movement of the stationary arc contact during the opening and closing process;

[0064] Moving arc contact: A device used for arc initiation and ablation resistance on the moving side during the opening and closing of disconnecting switches;

[0065] Static arc contact: A component used for static side arc initiation and ablation resistance during the opening and closing of disconnecting switches;

[0066] Rack: A component that works with the moving contact to ensure its stable movement;

[0067] Insulating torsion bar: A component that provides a power source for the moving contact and ensures the insulation strength between the moving side and the housing;

[0068] Contact finger: A component that slides in contact with the moving contact on the moving or stationary side during the opening and closing process, and serves as an electrical connection;

[0069] Guide components: Parts used to guide the moving contacts on the moving and stationary sides during the opening and closing of a disconnecting switch;

[0070] Contact base: The base used to mount the contact fingers on the moving and stationary sides of the disconnector switch.

[0071] As mentioned in the background technology, existing technologies store energy in the spring and store gas in the stationary chamber by pushing the moving contact to the stationary piston rod during the closing process, thereby achieving airflow arc extinguishing during the opening process. However, the high bus switching current and voltage parameters required by current standards result in extremely high arc energy, making the arc difficult to extinguish and still causing erosion of the moving and stationary arc contacts. In this structure, the moving and stationary arc contacts protrude more than other parts, forming weld scars after erosion. Severe erosion between the moving and stationary breaks poses a significant insulation risk during subsequent operation. The existing technology's claim that "in the initial opening phase, the pressure released by the energy-storing spring can be used by the piston to push the piston rod, thereby accelerating the reverse movement of the moving contact and increasing the opening speed" is meaningless. This is because the arc is only generated when the moving and stationary arc contacts just separate; before this, the speed of movement of the moving and stationary contacts is irrelevant to arc extinguishing. Furthermore, when the moving and stationary contacts just separate, the spring has already returned to its free length and has not stored energy, thus lacking the ability to increase the relative speed.

[0072] To address the aforementioned issues, this embodiment provides a disconnector switch contact transmission system. This system effectively prevents arcing from splashing onto the stationary shield and main contacts during high-parameter opening and closing tests, thus ensuring that the surfaces of the shield between the main breaks and the current-carrying main contacts are not damaged by arc erosion, and that the disconnector's rated current carrying capacity and insulation performance are not affected. The transmission system has a compact overall structure and is suitable for high-voltage lines ranging from 126kV to 1100kV.

[0073] like Figure 1 As shown, this embodiment provides a disconnector switch contact drive system, including a moving contact assembly 1, a stationary contact assembly 2, and a contact drive component 3, with the specific structure as follows:

[0074] like Figure 2 As shown, the moving contact assembly 1 consists of a moving contact 101, a moving side support 102, a moving side shield 103, and a first insulating basin 104. The moving contact 101 is movably arranged in the inner cavity of the moving side support 102 and is initially limited and fixed by the guide sleeve and the limiting spring in the inner cavity of the moving side support 102. It can move back and forth along the axial direction of the moving side support 102. The moving side support 102 is fixed on the central conductor of the first insulating basin 104. The moving side shield 103 is arranged coaxially with the moving side support 102 and is located outside the moving side support 102.

[0075] In this embodiment, the moving contact 101 includes a main contact 105 and an arc contact 106. The main contact 105 is composed of a moving main contact 107 and a moving main rack 108, and the arc contact is composed of a moving arc contact 109 and a moving arc rack 110.

[0076] Specifically, the moving main contact 107 has a hollow structure, with a moving main rack 108 arranged axially on its inner side. The moving main contact 107 has a guide groove 111 arranged parallel to the moving main rack 108 on its inner side, and an elongated hole 112 arranged axially on the top of the moving main contact 107. The elongated hole 112 is perpendicular to the moving main rack 108 and the moving arc rack 110.

[0077] In this embodiment, the moving arc contact 109 is arranged at the center of the inner cavity of the moving main contact 107 and can slide back and forth along the axial direction of the moving main contact 107.

[0078] As a preferred embodiment, the front end of the moving arc contact 109 is configured as a spherical copper-tungsten contact structure. The spherical structure allows the moving arc contact 109 to have low resistance, smooth insertion, and low operating power when it contacts the stationary arc contact 206.

[0079] The end of the moving arc contact 109 is fixed with a moving arc rack 110 parallel to the moving main rack 108. The moving arc rack 110 can slide linearly along the guide groove 111 inside the moving main contact 107. The guide groove 111 inside the moving main contact 107 ensures that the moving arc contact 109 is aligned with the moving main contact 107 during opening and closing movements, making it easier to ensure that the moving contact 101 and the stationary contact 201 are aligned. Better alignment can reduce wear on the contact surfaces of the moving and stationary contacts and the generation of wear foreign matter, thereby improving the contact reliability and insulation reliability of the contacts and increasing the service life of the disconnecting switch.

[0080] like Figure 2 and Figure 3As shown, in this embodiment, the contact transmission assembly 3 includes a gear shaft 301 and a transmission device 302. The gear shaft 301 is arranged on the moving side support 102 via a bearing 303. One end of the gear shaft 301 is connected to the transmission device 302, and the other end passes through the elongated hole 112 on the moving main contact 107, and meshes with the moving main rack 108 and the moving arc rack 110 simultaneously, thereby driving the moving main contact 107 and the moving arc contact 109 to engage and disengage. The gear shaft 301, the moving main rack 108 and the moving arc rack 110, and the moving contact and the contact transmission assembly structure are described.

[0081] Specifically, the gear shaft 301 adopts a double-gear structure, including a first gear 304 and a second gear 305, which are distributed sequentially along the axial direction of the gear shaft 301. The pitch circle sizes of the first gear 304 and the second gear 305 are different. The first gear 304 meshes with the moving arc rack 110, and the second gear 305 meshes with the moving main rack 108. Thus, the double-gear structure with unequal pitch circle sizes forms a differential transmission structure. With the cooperation of the moving main rack 108 and the moving arc rack 110, the moving main contact 107 and the moving arc contact 109 achieve axial movement in the same direction at different speeds.

[0082] It should be noted that, as an alternative to this embodiment, the gear transmission structure in the contact transmission assembly 3 can also be implemented using other mechanical transmission methods such as worm gears, connecting rods, or crank arms, which will not be elaborated further in this invention.

[0083] like Figure 4 As shown, in this embodiment, the stationary contact assembly 2 includes a stationary contact 201, a stationary side support 202, a stationary side shield 203, and a second insulating basin 204; the stationary contact 201 is fixed to the stationary side support 202, the tail of the stationary side support 202 is fixed to the center conductor of the second insulating basin 204, the stationary side shield 203 is coaxially arranged with the stationary side support 202, and the stationary side shield 203 is located outside the stationary side support 202.

[0084] Specifically, the stationary contact 201 consists of a stationary main contact 205, a stationary arc contact 206, and a stationary main contact protective shield 207.

[0085] It should be noted that contact structures include spring contacts, watchband contacts, contact grids, self-operated contacts, and other structures.

[0086] Among them, the stationary main contact protection shield 207 is located on the outside of the stationary main contact 205 and is fixedly connected to the stationary side support 202. The front end of the stationary main contact protection shield 207 is made of copper-tungsten material, and a guide ring is provided inside the stationary main contact protection shield 207.

[0087] The stationary arc contact 206 is located at the axial position of the stationary main contact 205, and the stationary arc contact 206 can move back and forth along the axial direction of the stationary main contact 205.

[0088] The stationary arc contact 206 consists of an umbrella-shaped arc contact 208, a stationary arc contact support 209, and a reset mechanism. The reset mechanism includes a reset spring 210 and a guide rod 211. The guide rod 211 is fixed to the bottom of the inner cavity of the stationary side support 202. The reset spring 210 is nested outside the guide rod 211, and the stationary arc contact support is sleeved outside the reset spring 210. The umbrella-shaped arc contact 208 made of copper-tungsten is fixed on the stationary arc contact support.

[0089] In this embodiment, the front end of the umbrella-shaped arc contact 208 is a conical umbrella-shaped structure, and the tail end of the conical umbrella is provided with a groove, which can satisfy the insertion contact of the moving arc contact.

[0090] The stationary arc contact support 209 is equipped with a return spring 210. The two are arranged together in the inner cavity of the stationary side support 202. The stationary arc contact support 209 and the umbrella-shaped arc contact 208 can move back and forth along the axial direction of the stationary side support 202. The stationary arc contact support 209 and the stationary side support 202 form a sliding electrical connection through a spring contact or a strap contact.

[0091] As can be seen, the disconnector contact transmission system provided in this embodiment has the following characteristics:

[0092] First, during the assembly of the moving contact, the moving arc contact can be made to "close first and then open" before the moving main contact through gear and rack transmission. During the switching of high-parameter bus current, the arc is effectively controlled between the moving arc contact and the stationary arc contact, thereby protecting the moving main contact from being burned by the arc and improving the insulation reliability after the switching of high-parameter bus current.

[0093] Secondly, the stationary arc contact adopts a conical umbrella structure. The arc erosion area of ​​the stationary arc contact is inside the conical umbrella. The electric field in this area is smaller than that at the end of the stationary arc contact. Therefore, after this area is eroded, it will not affect the insulation level between the moving and stationary sides.

[0094] Third, the protective shield of the stationary main contact is made of copper-tungsten alloy and is located on the outside of the stationary main contact. This protects the stationary main contact from arc erosion during the switching of high-parameter bus current, thereby ensuring the reliability of the electrical connection after the moving and stationary sides are closed, as well as the mechanical reliability during the opening and closing of the disconnecting switch.

[0095] This embodiment provides a disconnector switch contact transmission system, the specific working principle of which is as follows:

[0096] As shown in Figure 5, when the disconnect switch is in the open position, the drive source drives the transmission device 302, which in turn drives the gear shaft 301 to rotate counterclockwise. The second gear 305 of the gear shaft 301 meshes with the moving main rack 108, driving the moving main contact 107 to move in the closing direction. At the same time, the first gear 304 of the gear shaft 301 meshes with the moving arc rack 110, driving the moving arc contact 109 to move in the closing direction. When the movement reaches the closing point, the moving arc contact 109 contacts the stationary arc contact 206. The moving arc contact 109 then pushes the stationary arc contact 206 to continue moving in the closing direction, while simultaneously compressing the return spring 210 to store energy and continue the closing movement. Only then does the moving main contact 107 contact the stationary main contact 205.

[0097] Similarly, such as Figure 6 As shown, when the disconnector is in the closed position, the drive source drives the transmission device 302, which in turn drives the gear shaft 301 to rotate clockwise. The second gear 305 of the gear shaft 301 meshes with the moving main rack 108, driving the moving main contact 107 to move in the opening direction. At the same time, the first gear 304 of the gear shaft 301 meshes with the moving arc rack 110, driving the moving arc contact 109 to move in the opening direction. During the opening process, the reset spring 210 begins to restore energy to reset the stationary arc contact 206, ensuring that the position of the point of initial opening is consistent with the position of the point of initial closing, thereby ensuring that the moving main contact 107 and the stationary main contact 205 open first, and the moving arc contact 109 and the stationary arc contact 206 open later.

[0098] In this embodiment, by controlling the gear ratio between the first gear 304 and the second gear 305 on the gear shaft 301, different movement speeds can be achieved between the moving arc contact 109 and the moving main contact 107.

[0099] Specifically, when the gear ratio between the first gear 304 and the second gear 305 is greater than 1, the moving arc contact 109 moves faster than the moving main contact 107. When the disconnecting switch is closed, the moving arc contact 109 reaches the contact point faster than the moving main contact 107. That is, the moving arc contact 109 and the stationary arc contact 206 contact the stationary main contact 205 before the moving main contact 107 does, so that the pre-breakdown arc occurs between the moving arc contact 109 and the stationary arc contact 206 during the closing process of the disconnecting switch. At the same time, the stationary arc contact 206 adopts an umbrella-shaped arc contact 208, that is, an arc-wrapping structure. Because its end is a conical umbrella structure, it can wrap the arc and prevent it from spreading outward, thereby protecting the stationary main contact 205 and the stationary side shield 203 from arc erosion. Similarly, as Figure 7As shown, when the disconnecting switch performs an opening and closing operation, the moving main contact 107 separates from the stationary contact 201 side before the moving arc contact 109. The current is transferred from the moving main contact 107 to the moving arc contact 109. At the moment the disconnecting switch opens, a large-energy arc is generated when the moving arc contact 109 separates from the stationary arc contact 206. The arc is controlled within the umbrella-shaped range of the stationary arc contact 206 by the conical umbrella structure of the stationary arc contact 206, which prevents the arc from drifting to the moving main contact 107 and stationary main contact 205 that carry the rated current, as well as the stationary shield 203, thereby achieving a high opening and closing capacity of the disconnecting switch.

[0100] Therefore, the disconnector contact transmission system provided in this embodiment can effectively control the arc from splashing onto the stationary shield and main contacts during high-parameter opening and closing tests, thereby ensuring that the surface of the shield between the main breaks and the current-carrying main contacts is not damaged by arc erosion, and does not affect the disconnector's rated current carrying capacity and switch insulation performance.

[0101] In summary, the present invention provides a disconnector contact transmission system and method, which has the following advantages compared with existing disconnector transmission methods:

[0102] First, in the assembly of the moving contact, the moving main contact is equipped with a moving arc contact. The moving main contact and the moving arc contact are connected by a double gear structure, so that the moving arc contact is closed first and then opened. This confines the arc between the moving arc contact and the stationary arc contact, avoids the surface erosion of the moving main contact, and is beneficial to the insulation reliability after the switching current of the high-parameter bus is switched.

[0103] Secondly, the static arc contact adopts a conical umbrella structure, which can wrap the arc and prevent it from spreading outward. Moreover, the ablated part is located in a concave area, where the electric field is smaller than that at the end of the static arc contact, making it less likely to cause discharge. This is beneficial to the insulation reliability after the high-parameter bus switching current is switched on and off.

[0104] Third, the stationary main contact is equipped with a stationary main contact protection shield. The end of the stationary main contact protection shield is a copper-tungsten structure that is resistant to ablation. This can protect the stationary main contact from being affected by arc erosion during the switching of high-parameter bus current, thereby ensuring the reliability of the electrical connection after the dynamic and static sides are closed, as well as the mechanical reliability during the opening and closing of the disconnecting switch.

[0105] 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 contact transmission system for a disconnecting switch, characterized in that, include: Moving contact assembly (1), stationary contact assembly (2) and contact transmission assembly (3); The moving contact assembly (1) includes a moving side support (102) and a moving contact (101) disposed in the inner cavity of the moving side support (102); the moving contact (101) includes a moving main contact (107) that can move axially, and a moving arc contact (109) that can move axially is disposed inside the moving main contact (107). The stationary contact assembly (2) includes a stationary side support (202) and a stationary contact (201) disposed in the inner cavity of the stationary side support (202); the stationary contact (201) includes a stationary main contact (205) and an axially movable stationary arc contact (206) disposed in the stationary main contact (205). One end of the stationary arc contact (206) is connected to the stationary side support (202) through a reset mechanism, and the other end of the stationary arc contact (206) is provided with an arc wrapping structure, which can suppress and wrap the arc generated between the moving arc contact (109) and the stationary arc contact (206). The contact transmission assembly (3) includes a differential transmission structure connected to the drive source; The moving main contact (107) and the moving arc contact (109) are respectively connected to the differential transmission structure; The differential transmission structure can drive the moving main contact (107) and the moving arc contact (109) to move axially at different speeds, so that during the closing process, the moving arc contact (109) and the stationary arc contact (206) contact each other before the moving main contact (107) and the stationary main contact (205), and store energy for the reset mechanism; during the opening process, under the action of the reset mechanism, the moving main contact (107) and the stationary main contact (205) separate before the moving arc contact (109) and the stationary arc contact (206).

2. The disconnector contact transmission system according to claim 1, characterized in that, The differential transmission structure includes a gear shaft (301). The end of the gear shaft (301) is provided with a double gear structure, including a first gear (304) and a second gear (305), with the first gear (304) located above the second gear (305); Among them, the gear ratio of the first gear (304) and the second gear (305) is greater than 1; A moving main rack (108) is fixed on the moving main contact (107); a moving arc rack (110) is fixed on the moving arc contact (109). The first gear (304) is meshed with the moving main rack (108); the second gear (305) is meshed with the moving arc rack (110).

3. The disconnector contact transmission system according to claim 2, characterized in that, The gear shaft (301) is inserted into the moving side support (102) via a bearing (303); The drive end of the gear shaft (301) is connected to the drive source through a transmission device (302).

4. The disconnector contact transmission system according to claim 1, characterized in that, The moving contact assembly (1) also includes a moving side shield (103) and a first insulating basin (104). The moving side support (102) is fixed to the center conductor of the first insulating basin (104); The moving side shield (103) is coaxially arranged with the moving side support (102) and sleeved on the outside of the moving side support (102).

5. The disconnector contact transmission system according to claim 1, characterized in that, The moving main contact (107) has a guide rail groove (111) on its inner wall. The moving arc contact (109) is slidably connected in the guide rail groove (111); The top surface of the moving main contact (107) is provided with an elongated hole (112). The differential transmission structure passes through the elongated hole (112) and is connected to the moving main contact (107) and the moving arc contact (109) respectively.

6. The disconnector contact transmission system according to claim 1, characterized in that, The stationary contact assembly also includes a stationary side shield (203) and a second insulating basin (204). The static side support (202) is fixed to the center conductor of the second insulating basin (204); The static side shield (203) is coaxially arranged with the static side support (202) and sleeved on the outside of the static side support (202).

7. The disconnector contact transmission system according to claim 1, characterized in that, The stationary contact (201) also includes a stationary main contact protection shield (207). The stationary main contact protection shield (207) is disposed on the outside of the stationary main contact (205) and is fixedly connected to the stationary side support (202); The end of the static main contact protection shield (207) is made of copper-tungsten material and has a guide ring inside.

8. The disconnector contact transmission system according to claim 1, characterized in that, The reset mechanism includes a reset spring (210) and a guide rod (211); One side of the guide rod (211) is connected to the inner wall of the static side support (202); The reset spring (210) is sleeved on the outside of the guide rod (211), and the end is connected to a static arc contact support; the static arc contact (206) is fixedly connected to the static arc contact support.

9. The disconnector contact transmission system according to claim 1, characterized in that, The stationary arc contact (206) includes an umbrella-shaped arc contact (208); the end of the umbrella-shaped arc contact (208) is configured as a conical umbrella structure as an arc wrapping structure; the end of the conical umbrella structure is provided with a groove for the insertion of the moving arc contact (109).

10. A method for operating a disconnector contact transmission system, based on the disconnector contact transmission system according to any one of claims 1-9, characterized in that, include: During the closing process, the drive source drives the differential transmission structure, which in turn drives the moving main contact (107) and the moving arc contact (109) to move toward the stationary side at different speeds, so that the moving arc contact (109) and the stationary arc contact (206) make contact before the moving main contact (107) and the stationary main contact (205), and at the same time, the reset mechanism stores energy. During the opening process, the drive source drives the differential transmission structure, which in turn drives the moving main contact (107) and the moving arc contact (109) to move away from the stationary side at different speeds. At the same time, under the reset action of the reset mechanism, the moving main contact (107) and the stationary main contact (205) separate before the moving arc contact (109) and the stationary arc contact (206). During the closing or opening process, the arc-wrapping structure suppresses and wraps the arc generated between the moving arc contact (109) and the stationary arc contact (206).

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