An upper contact device

Abstract

This invention provides an upper contact device, comprising: a contact support; a movable contact plate rotatably mounted on the contact support; and a power input end of a power connector that is both driven and electrically connected to the movable contact plate, and a power output end that is connected to the moving electrode of a vacuum interrupter, thereby converting the rotational motion of the movable contact plate into a reciprocating linear motion of the power output end of the power connector along the opening and closing direction. This invention, through the cooperation of the movable contact plate and the power connector, mechanically links the opening and closing action of the upper movable contact of the high-voltage switchgear with the movement of the moving electrode of the vacuum interrupter, ensuring that the arc is always generated and quickly extinguished inside the vacuum interrupter, preventing arcing at the external contact breakage point. Utilizing the vacuum interrupter's characteristics, the contact breaking action and the vacuum interruption action are precisely linked, completely changing the inefficient traditional high-voltage switchgear model that relies on air extinguishing, and improving the rapid arc extinguishing capability of the high-voltage switchgear.

Description

Technical Field

[0001] This invention relates to the field of electrical switch technology, and more specifically, to an upper contact device. Background Technology

[0002] Disconnect switches and drop-out fuses are important protection and isolation devices in power distribution systems. They are widely used in urban and rural power grids, industrial and mining enterprise power distribution lines, and other scenarios. They mainly undertake the functions of circuit switching, fault protection and electrical isolation. Their performance directly affects the operational stability and safety of power distribution lines.

[0003] Currently, the contact structure design of traditional disconnect switches and drop-out fuses is relatively conventional, mostly possessing only basic circuit conduction and breaking functions, without corresponding arc-extinguishing structures. During equipment opening and closing operations, and during line overload or short-circuit fault breaking, a strong electric arc is generated at the moment of contact breaking. If the arc cannot be extinguished quickly, it will not only burn the contacts, insulation components, and other core components, significantly shortening the equipment's service life, but also easily cause phase-to-phase short circuits, ground flashovers, and other power faults. In severe cases, it can cause power outages, equipment burnout, and even threaten the personal safety of power operation and maintenance personnel.

[0004] Existing related equipment generally suffers from weak arc-extinguishing capabilities. Relying solely on natural air extinguishing results in slow extinguishing speed and poor arc-extinguishing effect, making it difficult to meet the safety breaking requirements under high-voltage and high-current conditions. Although some improved equipment has added simplified arc-extinguishing structures, these structures are mostly independent and cannot be linked with contact actions. They suffer from poor structural adaptability and low integration, with the arc-extinguishing action lagging behind the contact breaking action. This makes it impossible to eliminate arc hazards in a timely and effective manner, and the reliability and safety of equipment operation still need to be improved. Summary of the Invention

[0005] In view of this, the present invention proposes an upper contact device, which aims to solve the problem that the contact structure and arc extinguishing structure of existing high-voltage switchgear such as disconnecting switches and drop-out fuses are set independently and lack linkage, resulting in the arc extinguishing action lagging behind the contact breaking action and failing to eliminate the potential arc hazard in a timely and effective manner.

[0006] This invention proposes an upper contact device, comprising: a contact support for mounting on the side of the moving electrode facing away from the stationary electrode in a vacuum interrupter, providing support; and a moving contact plate rotatably mounted on the contact support. When the upper moving contact mounted on a high-voltage switchgear moves with the switchgear during closing, under the support of the upper moving contact, the moving contact plate rotates towards the upper moving contact until the high-voltage switchgear is fully closed, and simultaneously the upper moving contact provides bottom-positioned rigid support to the moving contact plate, thus achieving electrical connection between the upper moving contact and the moving contact plate. When the switching equipment performs a tripping or operational movement, causing the upper moving contact to trip, and the upper moving contact releases its rigid support at the bottom of the moving contact plate, the moving contact plate rotates towards the upper moving contact. A power connector, whose power input end is connected to and electrically connected to the moving contact plate, and whose power output end is used to connect to the moving electrode of the vacuum interrupter, converts the rotational motion of the moving contact plate into a reciprocating linear motion along the tripping / closing direction at the power output end of the power connector. This, in turn, drives the moving electrode of the connected vacuum interrupter to perform a synchronous reciprocating linear motion, thereby enabling the vacuum interrupter to perform tripping / closing operations.

[0007] Furthermore, in the aforementioned upper contact device, the power connector is slidably inserted through the contact bracket along the opening and closing direction. The input end of the power connector is connected to the moving contact plate. The moving contact plate is provided with a swing hole. The power connector is slidably inserted through the swing hole along the length direction of the swing hole, and is used to drive the power connector to perform reciprocating linear motion in the vertical direction when the swing hole rotates with the moving contact plate.

[0008] Furthermore, in the aforementioned upper contact device, the sway hole is a circular hole structure, an elongated through hole, or an oblong hole that is opened on the moving contact plate and has a diameter larger than that of the power connector. Its length direction extends along the plate surface direction of the moving contact plate, and is used to generate a thrust on the power connector when the moving contact plate rotates, so as to convert the rotational motion of the moving contact plate into the reciprocating linear motion of the power connector.

[0009] Furthermore, in the aforementioned upper contact device, the power connector is a bolt member, on which two adjusting nuts are threadedly connected to the bolt member and spaced apart. The two adjusting nuts are respectively clamped on both sides of the moving contact plate to limit the relative displacement of the moving contact plate along the axial direction of the power connector, so as to adjust the contact opening distance of the vacuum interrupter.

[0010] Furthermore, in the aforementioned upper contact device, the power connector passes through the contact bracket, the input end of the power connector is hinged to the moving contact plate, and the output end of the power connector is hinged to the moving electrode of the vacuum interrupter, forming a crank-slider structure to convert the rotation of the moving contact plate into the reciprocating linear movement of the moving electrode of the vacuum interrupter.

[0011] Furthermore, in the aforementioned upper contact device, the contact support is a horizontally placed U-shaped structure, comprising: a top support plate, a bottom support plate, and a vertical connecting plate; wherein, the bottom support plate is arranged parallel to the lower side of the top support plate, and is used to limit and support the moving contact plate, so that the moving contact plate rests on the bottom support plate in a free state, thereby limiting and supporting the moving electrode to the lower open position; the vertical connecting plate is disposed between the top support plate and the bottom support plate, and both ends of the vertical connecting plate are respectively connected to the top support plate and the bottom support plate.

[0012] Furthermore, in the aforementioned upper contact device, side support plates are provided on both sides of the top support plate away from the vertical connecting plate, and hinge holes are provided on the side support plates for installing and fixing the connecting shaft.

[0013] Furthermore, in the aforementioned upper contact device, the contact support is also provided with an auxiliary contact. The auxiliary contact is located on the pressing side of the moving contact plate and is rotatably mounted on the contact support. It is used to support the falling side of the upper moving contact of the high-voltage switchgear to laterally limit and secure it.

[0014] Furthermore, in the aforementioned upper contact device, a second elastic reset member is provided between the auxiliary contact and the contact support. This member is used to be twisted or compressed and store energy when the upper moving contact is gradually inserted into the moving contact plate and the auxiliary contact is pushed towards the vacuum interrupter to rotate. After the upper moving contact is locked in place, the energy is released to drive the auxiliary contact to reset to the lower locking position, thereby laterally locking and limiting the upper moving contact.

[0015] Furthermore, in the aforementioned upper contact device, a first elastic reset member is provided between the moving contact plate and the contact support. This member is used to compress and store energy when the upper moving contact is gradually engaged with the moving contact plate and pushes the moving contact plate towards the vacuum interrupter for closing rotation. When the moving contact plate loses its bottom positive position hard support, the member releases the energy to drive the moving contact plate to open rotation, thereby resetting it to the lower deflection position and driving the moving electrode of the vacuum interrupter to reset to the lower open position.

[0016] The upper contact device provided by this invention provides support through a contact bracket. Through the cooperation of the moving contact plate and the power connector, the opening and closing actions of the upper moving contact of the high-voltage switchgear are mechanically linked with the movement of the moving electrode of the vacuum interrupter. Specifically, when closing, the upper moving contact moves with the switch and first supports and contacts the moving contact plate. Through the rotation of the moving contact plate and the transmission of the power connector, the moving electrode of the vacuum interrupter is driven to move, so that the vacuum interrupter completes the closing. When opening, the upper moving contact releases the hard support of the bottom of the moving contact plate. The moving contact plate rotates in the opposite direction and drives the moving electrode of the vacuum interrupter to move through the power connector, so that the vacuum interrupter completes the opening first. Therefore, during the opening and closing operations of this device, the arc is always generated and rapidly extinguished inside the vacuum interrupter chamber, and no arc appears at the external contact breaking point. Relying on the vacuum interrupter chamber's arc-extinguishing characteristics, the contact breaking action and the vacuum interruption action are precisely linked and coordinated, completely changing the inefficient mode of traditional high-voltage switchgear that relies on air arc extinguishing. It can effectively improve the rapid arc extinguishing capability of high-voltage switchgear such as disconnecting switches and drop-out fuses, quickly and thoroughly eliminating the arc generated during contact breaking, and avoiding arc erosion of contacts and insulating components, and preventing phase-to-phase short circuits or ground faults. The system significantly improves the safety and stability of the equipment's opening and closing operations and fault disconnection process by mitigating flashover and other faults. Simultaneously, the integrated linkage structure design simplifies the overall equipment structure, enhances the compatibility and integration of the contacts and arc-extinguishing structure, reduces equipment failure rate and maintenance costs, extends equipment lifespan, and effectively adapts to the needs of various complex power distribution conditions. It also solves the problem of existing high-voltage switchgear where the contact and arc-extinguishing structures are independently configured and lack linkage, resulting in arc-extinguishing actions lagging behind contact disconnection actions and failing to eliminate arc hazards in a timely and effective manner. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the upper contact device provided in an embodiment of the present invention; Figure 2 This is a front view of the upper contact device provided in an embodiment of the present invention; Figure 3 This is a front sectional view of the upper contact device provided in an embodiment of the present invention; Figure 4 An exploded view of the upper contact device provided in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1-Contact bracket, 11-Top support plate, 111-Securing boss, 12-Bottom support plate, 13-Vertical connecting plate, 14-Side support plate, 11-Hinge hole, 15-Limiting baffle, 2-Moving contact plate, 21-Securing part, 211-Second contact surface, 22-Sway hole, 3-Auxiliary contact, 31-Securing groove, 32-Side locking and limiting structure, 4-Power connector, 41-Adjusting nut, 5-Connecting shaft, 6-First elastic reset component, 7-Second elastic reset component. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] See Figures 1 to 4 The figure illustrates a preferred structure of the upper contact device provided in an embodiment of the present invention. As shown, the device includes: a contact support 1, a moving contact plate 2, an auxiliary contact 3, and a power connector 4.

[0020] The contact bracket 1 is used to set on the side of the moving electrode facing away from the stationary electrode in the vacuum interrupter and serves as a support.

[0021] Specifically, the contact bracket 1, acting as a support frame, is located on the side of the vacuum interrupter facing away from the stationary electrode, such as the lower side of the vacuum interrupter, and can be fixedly connected to the bottom wall of the upper cover of the insulating base, serving a supporting function to support the moving contact plate 2, the auxiliary contact 3, and the power connector 4. In this embodiment, the contact bracket 1 can be a horizontal U-shaped structure, with its open end (e.g., Figure 1 The right end shown is arranged towards the high-voltage switchgear so that the high-voltage switchgear can be limited and secured by the moving contact plate 2 and the auxiliary contact 3.

[0022] The moving contact plate 2 is rotatably mounted on the contact bracket 1 and is used to hold the upper moving contact of the high-voltage switchgear, thereby achieving electrical connection between the upper moving contact and the moving contact plate 2 on the high-voltage switchgear. Simultaneously, when the upper moving contact on the high-voltage switchgear moves towards the vacuum interrupter during closing, the moving contact plate 2 rotates towards the vacuum interrupter under the supporting action of the upper moving contact (e.g., ...). Figure 1As shown), until the high-voltage switchgear is closed and the upper moving contact provides bottom-position hard support for the moving contact plate, and realizes the electrical connection between the upper moving contact and the moving contact plate; when the high-voltage switchgear performs opening displacement or action, driving the upper moving contact to open displacement, when the upper moving contact releases the bottom-position hard support for the moving contact plate, the moving contact plate rotates in the direction away from the vacuum interrupter.

[0023] Specifically, the moving contact 2 can be disposed within the U-shaped groove of the contact support 1, with one end of the moving contact 2 (e.g.) Figure 2 The right end shown is hinged to the open end of the contact bracket 1 via a connecting shaft 5, such as a pin. Figure 2 The right end shown can be rotated about the axis of the connecting shaft 5, so that the entire moving contact plate 2 can be deflected within the U-shaped groove of the contact bracket 1, thereby allowing the other end of the moving contact plate 2 (such as the right end shown) to be rotated. Figure 3 The left end (shown) is limited by two deflection positions. A locking part 21 is provided at the middle position of the moving contact plate 2 to lock onto the upper moving contact of the high-voltage switchgear. The locking part 21 can be a circular groove, the inner wall of which serves as the contact surface 211 of the second contact. One end of the moving contact plate 2 is provided with two spaced rotating arms to be hinged to the connecting shaft 5, and to allow room for other components such as the auxiliary contact 3.

[0024] The auxiliary contact 3 is located on the pressing side of the moving contact plate 2 and is rotatably mounted on the contact bracket 1. It is used to support the falling side of the upper moving contact of the high voltage switchgear to limit and lock it, preventing it from rotating clockwise and falling.

[0025] Specifically, the auxiliary contact 3 is located on the pressing side of the moving contact plate 2 (e.g., Figure 1 (As shown below), the auxiliary contact 3 can be set at the opening side of the U-shaped groove of the contact support 1, and one end of the auxiliary contact 3 (such as...) Figure 3 The right end shown is hinged to the open end of the contact bracket 1 via a connecting shaft 5, such as a pin. Figure 3 The right end shown can be rotated about the axis of the connecting shaft 5, so that the auxiliary contact 3 as a whole can be deflected within the U-shaped groove of the contact support 1, so that the other end of the auxiliary contact 3 (as shown) can be rotated. Figure 3The auxiliary contact 3 (shown on the left) limits and secures the side of the upper moving contact, achieving peripheral limitation. In this embodiment, one end of the auxiliary contact 3 is provided with two spaced rotating arms that are hinged to the connecting shaft 5 and can make way for other components such as the second elastic reset member 7. To improve the structural compactness of the device, preferably, the rotation axis of the auxiliary contact 3 and the moving contact plate 2 are coaxially arranged; that is, the first ends of both the auxiliary contact 3 and the moving contact plate 2 are sleeved on the connecting shaft 5 and can rotate around the connecting shaft 5. The other end of the auxiliary contact 3 is provided with a locking groove 31 that is laterally adapted to the upper moving contact, used to abut against the outer edge of the upper moving contact to achieve lateral limitation, and can rotate through the side wall of the upper moving contact when the upper moving contact is forcibly displaced, thus making way for the movement of the upper moving contact. In this embodiment, the auxiliary contact 3 and the moving contact plate 2 are electrically connected. When closing the circuit, the auxiliary contact 3 can preferentially contact the upper moving contact, so that the upper moving contact is electrically connected to the device first, and then the vacuum interrupter is closed. This ensures that the arc can be extinguished only in the vacuum interrupter. When opening the circuit, the auxiliary contact 3 is finally separated from the upper moving contact. This further ensures that when the high-voltage switchgear is opened, the electrical connection between the upper moving contact and the device is cut off after the vacuum interrupter is opened, ensuring that the arc can be extinguished only in the vacuum interrupter.

[0026] The power input end of the power connector 4 is connected to the moving contact plate 2 via transmission and electrical connection, and the power output end is used to connect to the moving electrode of the vacuum interrupter, so as to convert the rotational motion of the moving contact plate 2 into the power output end of the power connector 4 along the opening and closing direction (e.g., Figure 1 The reciprocating linear motion (shown in the vertical direction) drives the moving electrode of the connected vacuum interrupter to reciprocate linearly in sync, so that the vacuum interrupter can perform opening and closing actions.

[0027] Specifically, the power connector 4 is positioned between the vacuum interrupter and the moving contact 2. Its power input end is both driven and electrically connected to the moving contact 2, allowing the rotational motion of the moving contact 2 to be converted into a vertical linear displacement via the power connector 4. Under normal operating conditions, the high-voltage switchgear is in the vertical closed position, the moving contact 2 is at a horizontal or near-horizontal initial angle, and the power connector 4 is in a high position. The power output end of the power connector 4 is connected to the moving electrode. The vertical linear motion of the power output end of the power connector 4 drives the moving electrode to synchronously perform a vertical reciprocating linear motion, thereby realizing the opening or closing action of the vacuum interrupter. Simultaneously, the power input end of the power connector 4 remains electrically connected to the moving contact 2, allowing the main circuit current to be transmitted through the moving contact 2 to the moving electrode via the power connector 4, and then output to the power supply side from the stationary electrode via the upper terminal. In other words, the power connector 4 performs both mechanical transmission and conductive functions, eliminating the need for additional conductive connectors. In this embodiment, the vacuum interrupter and the upper moving contact are located on the upper and lower sides of the moving contact plate. During opening, the moving contact plate rotates away from the vacuum interrupter, approaching the upper moving contact. Therefore, in the early stage of driving the moving electrode downward, the moving contact plate will always be in contact with the upper moving contact, or the device will be electrically connected to the upper moving contact through other components. The two are electrically connected until the moving contact plate rotates to its position. At this time, the moving electrode and the stationary electrode separate, realizing the opening of the vacuum interrupter. The high-voltage switchgear continues to open, causing the moving contact plate to separate from the upper moving contact. During closing, the moving contact plate first contacts the upper moving contact to establish an electrical connection, and then drives the moving electrode upward through the power connection component, realizing the closing of the vacuum interrupter.

[0028] When the high-voltage switchgear performs a tripping or operational movement, causing the upper moving contact to trip, the upper moving contact releases its bottom rigid support on the moving contact plate 2. The moving contact plate 2 then loses its bottom rigid support and rotates away from the vacuum interrupter, i.e., under the downward rotational force, it moves as follows: Figure 1 The counterclockwise rotation shown drives the moving electrode downwards via the power connector 4, causing the vacuum interrupter to open. When the fault is cleared, the operator pushes the high-voltage switchgear back to the closing position or performs electric closing. The upper moving contact supports the switch, and under this support, the moving contact 2 rotates towards the vacuum interrupter, thus causing the moving contact 2 to rotate in the opposite direction (e.g., ...). Figure 1 (As shown, rotating clockwise), the power connector 4 drives the moving electrode to move in the opposite linear direction, that is, to move upward, thereby closing the vacuum interrupter.

[0029] See also Figures 1 to 4To ensure that the vacuum interrupter is in the open position when the high-voltage switchgear is disconnected, especially in the open position in the free state, i.e. the moving electrode is in the lower separated position, a first elastic reset member 6 is provided between the moving contact plate 2 and the contact support 1. When the upper moving contact of the high-voltage switchgear is gradually inserted into the moving contact plate 2 and pushes the moving contact plate 2 to rotate towards the vacuum interrupter, it is compressed and stores energy. When the moving contact plate 2 loses its bottom hard support, it releases energy to drive the moving contact plate 2 to reset to the lower deflection position and drive the moving electrode of the vacuum interrupter to reset to the lower open position.

[0030] Specifically, when the upper moving contact of the high-voltage switchgear is engaged, the moving contact plate 2 rotates towards the vacuum interrupter, i.e., rotates clockwise. This causes the power connection member 4 to move the moving electrode of the vacuum interrupter towards the stationary electrode 21 of the vacuum interrupter, i.e., move upwards, until the upper moving contact of the high-voltage switchgear is firmly engaged on the moving contact plate 2. At this point, the moving electrode and stationary electrode of the vacuum interrupter close, completing the closing action. During this process, the first elastic reset member 6 is compressed and stores energy, applying force to the moving contact plate 2 so that when the moving contact plate 2 is in a free state, i.e., without bottom rigid support, it can rotate in the opposite direction, i.e., counterclockwise, to the lower deflection position, thus moving the moving electrode of the vacuum interrupter to the lower open position. The first elastic reset member 6 can be a compression spring, i.e., a closing spring, located between the top wall of the contact support 1 and the moving contact plate 2, with its top end fixed to the top wall of the contact support 1 and its bottom end fixed to the moving contact plate 2. The first elastic reset member 6 has an energy storage function, which allows the moving contact plate 2 to rotate preferentially when it loses its bottom rigid support. This causes the contacts in the vacuum interrupter chamber, i.e., the contacts between the moving electrode and the stationary electrode, to open preferentially. The rotation of the moving contact plate 2 causes its second contact contact surface 211 to also be in contact with the corresponding first contact contact surface on the upper moving contact. Then, under the action of gravity, the upper moving contact rotates and separates, causing the upper moving contact and the moving contact plate 2 to separate, so that the arc can be extinguished in the vacuum interrupter chamber, thus avoiding the occurrence of arc phenomena on the outside.

[0031] See also Figures 1 to 4 A second elastic reset member 7 is provided between the auxiliary contact 3 and the contact support 1. When the upper moving contact of the high-voltage switchgear is gradually inserted into the moving contact plate 2 and the auxiliary contact 3 is pushed to rotate towards the vacuum interrupter, it is twisted or compressed and stores energy. After the upper moving contact of the high-voltage switchgear is locked in place, the energy is released to drive the auxiliary contact 3 to reset to the lower locking position, thereby laterally locking and limiting the upper moving contact of the high-voltage switchgear.

[0032] Specifically, the auxiliary contact 3 is rotatably mounted on the contact support 1, and a second elastic reset member 7 is provided between it and the contact support 1. The second elastic reset member 7 is used to store energy when the high-voltage switchgear is closed, and to release energy after the closing position is reached, so that the auxiliary contact 3 is reset to the locked position. During the process of the high-voltage switchgear flipping from the tilted state to the closed position, its upper moving contact gradually rotates and approaches the locking part 21 of the moving contact plate 2, first contacting the auxiliary contact 3, pushing the auxiliary contact 3 to rotate around its axis towards the vacuum interrupter, for example, swinging upward, i.e., rotating clockwise, to make way for the engagement of the moving contact plate 2 and the upper moving contact, so that the upper moving contact can move from the auxiliary contact 3 to below the moving contact plate 2, and during this process, the upper moving contact is always in contact with the auxiliary contact 3. During the process of the auxiliary contact 3 being pushed and rotated, the second elastic reset member 7 is twisted or compressed, thereby storing elastic potential energy. This ensures that the auxiliary contact 3 always has a downward swinging tendency during the process of being pushed and rotated, thus ensuring that the auxiliary contact 3 always contacts the upper moving contact and ensures that there is a contact electrical connection between the two. That is, during this process, after the upper moving contact contacts the auxiliary contact 3, there is always a contact electrical connection between the auxiliary contact 3 and the upper moving contact. When the upper moving contact of the high-voltage switchgear is fully engaged in the locking part 21 of the moving contact plate 2 and locked in place, the resistance pressure on the auxiliary contact 3 disappears, and the second elastic reset member 7 releases the stored elastic potential energy, driving the auxiliary contact 3 to rotate in the opposite direction and reset, so that the auxiliary contact 3 returns to its lower locking position, especially when locked on the upper moving contact. The upper moving contact may be provided with a guide surface for guiding the forced opening, so that the auxiliary contact 3 can rotate clockwise when the high-voltage switchgear is forcibly opened. In this lower locking position, the end of the auxiliary contact 3 abuts against or locks against the outer edge of the upper moving contact of the high-voltage switchgear from the side, forming a lateral locking limit on the upper moving contact to prevent it from dislodging from the locking part 21 of the moving contact plate 2 under vibration or external force, ensuring the stability and reliability of the closed state. When it is necessary to open, a larger force causes the auxiliary contact 3 to rotate clockwise, making way for the upper moving contact to move out, thus realizing the opening. At the same time, when the upper moving contact moves out from below, the restoring force of the second elastic reset member 7 ensures that the auxiliary contact 3 is always in contact with the upper moving contact until the auxiliary contact 3 is completely separated from the upper moving contact. The second elastic reset member 7 is preferably a torsion spring, which is sleeved on the rotating shaft, i.e., the connecting shaft 5, of the auxiliary contact 3, and the two arms of the torsion spring abut against the auxiliary contact 3 and the contact support 1, respectively. When the auxiliary contact 3 is pushed to rotate, the torsion spring stores energy; when the resistance of the auxiliary contact 3 disappears, the torsion spring releases torque to drive the auxiliary contact 3 to rotate in the opposite direction to reset. The torsion spring has the advantages of compact structure, convenient installation, and stable reset torque, making it suitable for providing reliable reset force in limited spaces.

[0033] With the aforementioned second elastic reset member 7, the auxiliary contact 3 can automatically yield during the closing process of the high-voltage switchgear and automatically reset to the locked position after closing, achieving reliable lateral locking and limiting of the moving contact on the high-voltage switchgear, improving the stability and vibration resistance of the closing state, and avoiding accidental tripping due to vibration or impact. Simultaneously, it ensures that during closing operation, the auxiliary contact 3 preferentially contacts the upper moving contact and remains in contact with it. During opening, when the moving contact plate 2 separates from the upper moving contact, the auxiliary contact 3 remains electrically connected to the upper moving contact and maintains this connection until the upper moving contact separates from the auxiliary contact 3. Furthermore, when the upper moving contact moves out from below, the reset force of the second elastic reset member 7 ensures that the auxiliary contact 3 remains electrically connected to the upper moving contact until they are completely separated.

[0034] See also Figure 4 The auxiliary contact 3 is provided with a side locking and limiting structure 32, which is used to limit the position of the auxiliary contact 3 when it is reset so that it is reset and limited to such a position. Figure 3 The lower locking position is shown. Specifically, one end of the auxiliary contact 3 is the hinged end (such as...). Figure 4 The right end (as shown) extends upward to form a sidewall. The right end of the top of the sidewall is an endpoint limiting structure, a right-angle structure as shown, serving as the side locking limiting structure 32. The side locking limiting structure 32 forms a point contact limiting fit with the corresponding part of the contact bracket 1, such as the bottom wall of the top support plate 11, thus limiting the opening angle of the auxiliary contact 3. When the auxiliary contact 3 rotates back to its original position under the drive of the second elastic reset member 7, the side locking limiting structure 32 on the auxiliary contact 3 swings downward accordingly. When the auxiliary contact 3 resets to the preset lower locking position, the side locking limiting structure 32 abuts against the corresponding part of the contact bracket 1, preventing the auxiliary contact 3 from continuing to rotate, thereby precisely limiting the auxiliary contact 3 to the lower locking position. Through the contact limiting fit between the side locking limiting structure 32 and the contact bracket 1, the reset position of the auxiliary contact 3 is limited within a preset angle range, ensuring that after the auxiliary contact 3 resets, its end can accurately perform lateral locking and limiting of the upper moving contact of the high-voltage switchgear. After the auxiliary contact 3 rotates to the preset opening angle, the side-locking limit structure 32 abuts against the contact bracket 1 again, preventing the auxiliary contact 3 from continuing to rotate. This prevents the auxiliary contact 3 from disengaging from the upper moving contact or interfering with other components due to excessive rotation. Through the limiting effect of the side-locking limit structure 32, the rotation range of the auxiliary contact 3 is limited to a preset range. This ensures that the auxiliary contact 3 can provide sufficient clearance for the engagement of the moving contact plate 2 and the upper moving contact during the closing process, while also avoiding reset failure or structural interference caused by excessive rotation of the auxiliary contact 3.

[0035] See also Figures 1 to 4In one embodiment of this invention, the power connector 4 is slidably inserted through the contact bracket 1 in the vertical direction. The input end of the power connector 4 is connected to the moving contact plate 2. The moving contact plate 2 is provided with a swing hole 22. The power connector 4 is slidably inserted through the swing hole 22 along the length direction of the swing hole 22. When the swing hole 22 rotates with the moving contact plate 2, it drives the power connector 4 to perform reciprocating linear motion in the vertical direction.

[0036] Specifically, the contact support 1 is fixedly mounted on the insulating base and positioned below the vacuum interrupter, providing vertical sliding guidance for the power connector 4. Alternatively, it can be guided and limited by the vacuum interrupter, i.e., the sliding guide limit of the moving electrode. The power connector 4 passes through the contact support 1 and can slide vertically up and down relative to the contact support 1. The lower end of the power connector 4 passes through the swing hole 22 on the moving contact plate 2 and can slide relative to the moving contact plate 22 along its length. The upper end of the power connector 4 is connected to the moving electrode of the vacuum interrupter. The swing hole 22 is a circular hole, elongated through hole, or oblong hole on the moving contact plate 2 with a diameter larger than that of the power connector 4, extending along the surface of the moving contact plate 2. When the high-voltage switchgear is in the vertical closed position, the moving contact 2 is at its initial angle, the length direction of the swing hole 22 is approximately horizontal or inclined, and the power connection 4 is located to the left of the swing hole 22. At this time, the vacuum interrupter is in the closed state. When the high-voltage switchgear performs an opening operation, under the support of the upper moving contact, the moving contact 2 rotates outward around the connecting shaft 5, as shown in the figure. Figure 3 The rotation is counterclockwise as shown. The rotation of the moving contact plate 2 causes the sway hole 22 on it to rotate together. As the angle between the moving contact plate 2 and the sway hole 22 changes, the moving contact plate 2 applies a thrust to the power connector 4 that passes through it. Since the power connector 4 can only slide in the vertical direction, the sway hole 22 forces the power connector 4 to slide relative to the length of the sway hole 22 during rotation, and at the same time, it generates displacement in the vertical direction. That is, the horizontal or inclined component motion generated by the rotation of the moving contact plate 2 is converted into the linear motion of the power connector 4 in the vertical direction, that is, downward movement. Through the power connector 4, the moving electrode of the vacuum interrupter moves downward, causing the moving electrode to separate from the stationary electrode 21, thereby realizing the opening action of the vacuum interrupter. After the fault is cleared, the operator pushes the high-voltage switchgear back to the closed position or electrically pushes it back to the closed position. The moving contact plate 2 rotates in the reverse direction, i.e., clockwise, and the sway hole 22 rotates in the reverse direction, driving the power connection 4 to move upward. The power connection 4 pushes the moving electrode of the vacuum interrupter upward, so that the moving electrode and the stationary electrode 21 re-contact and close, realizing the closing action of the vacuum interrupter. For example, Figure 3As shown, the power connector 4 is a bolted component with two adjusting nuts 41 clamped on both sides of the moving contact plate 2. This ensures that the moving contact plate 2 can only deflect between the two adjusting nuts 41, thereby ensuring that the moving contact plate 2 can drive the adjusting nuts 41 to move up and down when it deflects, which in turn drives the power connector 4 to move up and down. The adjusting nuts 41 are threadedly connected to the bolted component. The position of the adjusting nuts 41 fixed to the bolted component can be adjusted according to the actual situation, thereby adjusting the transmission connection position of the moving contact plate 2 on the power connector 4. When the moving contact plate 2 is deflected to the lower open position, its free end abuts against the top wall of the bottom support plate 12, which is a fixed position. By adjusting the position of the adjusting nuts 41, the height of the power connector 4 can be adjusted, thus adjusting the contact opening distance of the vacuum interrupter. In other words, when the adjusting nuts 41 are fixed at a higher position on the power connector 4, and the moving contact plate 2 is deflected to the lower open position, the power connector 4 is lower, resulting in a larger contact opening distance of the vacuum interrupter, and vice versa. The power connector 4 has a conductive function, enabling a conductive connection between the moving electrode and the moving contact plate 2. Of course, in other embodiments, the two can also be connected by other conductive components, such as flexible connections.

[0037] Through the aforementioned cooperation structure between the sway hole 22 and the power connector 4, the thrust generated by the rotation of the moving contact plate 2 on the power connector 4 is used to convert the rotational motion of the moving contact plate 2 into the vertical reciprocating linear motion of the power connector 4, thereby driving the moving electrode of the vacuum interrupter to perform opening and closing actions. This structure is simple and compact, with reliable transmission. It can realize the conversion from the rotational motion of the moving contact plate 2 to the vertical linear motion of the power connector 4 without the need for complex linkages or cam mechanisms, thus reducing manufacturing precision requirements and manufacturing costs.

[0038] It should be noted that the length of the swing hole 22 should be greater than the relative sliding stroke of the power connector 4 in the swing hole 22 during vertical movement, so as to ensure that the power connector 4 always has sufficient room for movement in the swing hole 22 and avoid jamming.

[0039] In another embodiment of this invention, the power connector 4 passes through the contact bracket 1. The input end of the power connector 4 is hinged to the moving contact plate 2, and the output end of the power connector 4 is hinged to the moving electrode of the vacuum interrupter, forming a crank-slider structure to convert the rotation of the moving contact plate 2 into the reciprocating linear movement of the moving electrode of the vacuum interrupter.

[0040] Specifically, the power connector 4 is a vertically arranged link member that passes through the contact support 1 and can slide vertically relative to the contact support 1. The lower end of the power connector 4 is hinged to the moving contact plate 2 via a first hinge shaft, with the hinge point located on the moving contact plate 2 off from its rotation center, particularly at the left end. The upper end of the power connector 4 is hinged to the lower end of the moving electrode of the vacuum interrupter via a second hinge shaft. The rotation center of the moving contact plate 2, the first hinge point between the power connector 4 and the moving contact plate 2, the second hinge point between the power connector 4 and the moving electrode, and the vertical sliding guide line of the moving electrode together constitute the kinematic model of the crank-slider mechanism. The moving contact plate 2 rotates around its rotation center, equivalent to the crank in the crank-slider mechanism; the power connector 4, as a link, transmits the rotation of the moving contact plate 2 to the moving electrode; the moving electrode is slidably disposed vertically inside the vacuum interrupter, equivalent to the slider in the crank-slider mechanism. When the high-voltage switchgear is in the vertical closed position, the moving contact 2 is at its initial angle, the first hinge point is at its initial position on the moving contact 2, the second hinge point is at its high position, the moving electrode and the stationary electrode 21 are in contact and closed, and the vacuum interrupter is in the closed state. When the high-voltage switchgear performs an opening operation, under the supporting action of the upper moving contact, the moving contact 2 rotates outward around the connecting shaft 5, as shown below. Figure 3 The counter-clockwise rotation shown is equivalent to crank rotation. The first hinge point moves downwards with the rotation of the moving contact plate 2, causing the power connector 4 to slide downwards vertically. The power connector 4 then moves the moving electrode downwards via the second hinge point, separating the moving electrode from the stationary electrode 21, thus achieving the opening action of the vacuum interrupter. After the fault is cleared, the operator pushes the high-voltage switchgear back to the closed position or electrically pushes it back to the closed position. The moving contact plate 2 rotates in the opposite direction, clockwise, causing the first hinge point to move upwards. This moves the power connector 4 upwards vertically, and the power connector 4 then pushes the moving electrode upwards via the second hinge point, causing the moving electrode to re-engage and close with the stationary electrode 21, thus achieving the closing action of the vacuum interrupter.

[0041] Through the aforementioned crank-slider structure, the rotational motion of the moving contact plate 2 is precisely converted into the reciprocating linear motion of the moving electrode. This structure has the advantages of a definite motion relationship, a constant transmission ratio, and reliable operation. Simultaneously, the hinged connection is adaptive, compensating for machining and assembly errors and ensuring smooth motion transmission.

[0042] See also Figures 1 to 4The contact support 1 is a horizontal U-shaped structure, which includes: a top support plate 11, a bottom support plate 12, and a vertical connecting plate 13; wherein, the bottom support plate 12 is arranged parallel to the lower side of the top support plate 11, and is used to limit and support the moving contact plate 2, so that the moving contact plate 2 supports the bottom support plate 12 in a free state, thereby limiting the moving electrode of the vacuum interrupter to the lower open position; the vertical connecting plate 13 is arranged between the top support plate 11 and the bottom support plate 12, and both ends of the vertical connecting plate 13 are connected to the top support plate 11 and the bottom support plate 12 respectively.

[0043] Specifically, the contact support 1 has a horizontal U-shaped structure, with the opening facing the high-voltage switchgear, and its cross-section is roughly "U". The top support plate 11 and the bottom support plate 12 are arranged parallel to each other, forming a space between them to accommodate the moving contact plate 2, auxiliary contact 3, and power connection component 4, among other related components. The vertical connecting plate 13 is located on the same side of the top support plate 11 and the bottom support plate 12 (e.g., ...). Figure 1 The left end of the top support plate 11 and the left end of the bottom support plate 12 are fixedly connected to each other. The three can be integrally formed, and the top support plate 11 and the bottom support plate 12 are connected as a whole to form a U-shaped frame structure. The bottom support plate 12 is located at the lower part of the contact bracket 1, and its upper surface is used to form a contact fit with the lower surface of the moving contact plate 2. When the high-voltage switchgear is in the open state or free state, under the downward force of the first elastic reset member 6, the lower surface of the moving contact plate 2 abuts against the upper surface of the bottom support plate 12, and the bottom support plate 12 provides an upward support force for the moving contact plate 2. Through the limiting support of the bottom support plate 12 for the moving contact plate 2, the moving contact plate 2 is limited to the lowest position, thereby limiting the lower limit position of the moving electrode of the vacuum interrupter chamber that is connected to the moving contact plate 2 through the power connection member 4. When the moving contact 2 abuts against the bottom support plate 12, the moving contact 2 cannot continue to rotate downwards, and the power connector 4 and the moving electrode of the vacuum interrupter are also correspondingly limited to the lowest position to prevent the moving electrode from moving excessively downwards. The top support plate 11 is located on the upper part of the contact bracket 1, and a support structure for rotating connection with the auxiliary contact 3 can be provided on it. The top support plate 11 also slides with the upper end of the power connector 4 to provide guidance and limitation for the vertical sliding of the power connector 4. Among them, the bottom wall of the top support plate 11 is provided with a locking boss 111 for fixing the top end of the first elastic reset member 6. Side support plates 14 extend downwards on both sides of the right end of the top support plate 11, and the side support plates 14 are provided with hinge holes 11 for installing and fixing the connecting shaft 5. The end of the bottom support plate 12 (such as Figure 1 A limiting baffle 15 extends downward from the right end shown, which is used to laterally limit the upper moving contact so that the upper moving contact is limited between the limiting baffle 15 and the auxiliary contact 3.

[0044] With the contact bracket 1 set in a horizontal U-shape, the top support plate 11 and the bottom support plate 12 are arranged in parallel vertically. This provides a guiding space for the vertical sliding of the power connector 4, and the bottom support plate 12 limits the lower limit position of the moving electrode of the vacuum interrupter by limiting the moving contact plate 2. At the same time, the opening of the U-shape structure faces the high-voltage switchgear, providing sufficient space for the rotation and sway of the moving contact plate 2. The overall structure is compact and has a high degree of functional integration.

[0045] The working process of the upper contact device: When the high-voltage switchgear is in the open state, the vacuum interrupter is always in the open state; when the high-voltage switchgear is closed manually or electrically, the upper moving contact first contacts the auxiliary contact 3, pushing the auxiliary contact 3 to rotate around its axis towards the vacuum interrupter, that is, swinging upwards. Figure 2 The clockwise rotation shown is for the moving contact plate 2 to engage with the upper moving contact, and the second elastic reset member 7 is twisted to store energy. The auxiliary contact 3, under the action of the second elastic reset member 7, supports the upper moving contact to achieve electrical connection. The upper moving contact continues to rotate counterclockwise with the high-voltage switchgear, contacts the moving contact plate 2, and pushes the moving contact plate 2 to rotate clockwise. The moving contact plate 2 compresses the first elastic reset member 6, and drives the moving end of the vacuum interrupter, i.e., the moving electrode, to move upward through the power connection member 4. When closing, the contacts inside the vacuum interrupter are connected, i.e., the contacts of the moving electrode and the stationary electrode are connected. The auxiliary contact 3, under the action of the second elastic reset member 7, resets and pops out and laterally locks against the side wall of the upper moving contact. At this time, the high-voltage switchgear is in a stable state and will not fall. The high-voltage switchgear is closed in place, completing the closing process under load. In the entire closing process, the upper moving contact first touches the upper contact device, and then the vacuum interrupter closes. Therefore, the arc will be extinguished in the vacuum interrupter, and no arc phenomenon will appear outside.

[0046] The principle of arc extinguishing during tripping is the same. When manually tripping is performed, i.e., pulling the operating ring on the high-voltage switchgear, or when tripping is electrically driven, the force applied to the upper moving contact exceeds the reset force of the second elastic reset member 7. The side wall of the upper moving contact slides out of the auxiliary contact 3. During this process, the auxiliary contact 3 rotates clockwise under the pressure of the upper moving contact. Under the action of the second elastic reset member 7, the auxiliary contact 3 contacts the upper moving contact to achieve electrical connection. At this time, the upper moving contact releases its rigid support on the moving contact plate 2. The moving contact plate 2 rotates counterclockwise under the reset force of the first elastic reset member 6 and is powered by... Connector 4 drives the moving electrode of the vacuum interrupter downwards. As the operating ring is pulled clockwise or electrically driven, the moving electrode of the vacuum interrupter moves downwards with the rotation of the moving contact plate 2 until the internal contacts of the vacuum interrupter open. At this point, the upper moving contact moves below the auxiliary contact 3. The auxiliary contact 3, under the action of the second elastic reset member 7, maintains contact with the upper moving contact. After the internal contacts of the vacuum interrupter open, as the high-voltage switchgear continues to rotate clockwise with the operating ring, the upper moving contact and the auxiliary contact 3 completely separate, completing the opening process under load. During the opening process, the internal contacts of the vacuum interrupter open first, and then the upper moving contact and the upper contact device separate, extinguishing the arc within the vacuum interrupter.

[0047] In summary, the upper contact device provided in this embodiment provides support through the contact bracket. Through the cooperation of the moving contact plate and the power connector, the opening and closing actions of the upper moving contact of the high-voltage switchgear are mechanically linked with the movement of the moving electrode of the vacuum interrupter. That is, when closing, the upper moving contact moves with the switch and first supports and contacts the moving contact plate. Through the rotation of the moving contact plate and the transmission of the power connector, the moving electrode of the vacuum interrupter is driven to move, so that the vacuum interrupter completes the closing. When opening, the upper moving contact releases the hard support of the bottom of the moving contact plate. The moving contact plate rotates in the opposite direction and drives the moving electrode to move through the power connector, so that the vacuum interrupter completes the opening first. Therefore, during the opening and closing operations of this device, the arc is always generated and rapidly extinguished inside the vacuum interrupter chamber, and no arc appears at the external contact breaking point. Relying on the vacuum interrupter chamber's arc-extinguishing characteristics, the contact breaking action and the vacuum interruption action are precisely linked and coordinated, completely changing the inefficient mode of traditional high-voltage switchgear that relies on air arc extinguishing. It can effectively improve the rapid arc extinguishing capability of high-voltage switchgear such as disconnecting switches and drop-out fuses, quickly and thoroughly eliminating the arc generated during contact breaking, and avoiding arc erosion of contacts and insulating components, and preventing phase-to-phase short circuits or ground faults. The system significantly improves the safety and stability of the equipment's opening and closing operations and fault disconnection process by mitigating flashover and other faults. Simultaneously, the integrated linkage structure design simplifies the overall equipment structure, enhances the compatibility and integration of the contacts and arc-extinguishing structure, reduces equipment failure rate and maintenance costs, extends equipment lifespan, and effectively adapts to the needs of various complex power distribution conditions. It also solves the problem of existing high-voltage switchgear where the contact and arc-extinguishing structures are independently configured and lack linkage, resulting in arc-extinguishing actions lagging behind contact disconnection actions and failing to eliminate arc hazards in a timely and effective manner.

[0048] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0049] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An upper contact device, characterized in that, include: The contact support is used to set on the side of the moving electrode facing away from the stationary electrode in the vacuum interrupter and to provide support. A moving contact plate is rotatably mounted on the contact bracket. When the upper moving contact on the high-voltage switchgear moves to close position with the high-voltage switchgear, under the support of the upper moving contact, the moving contact plate rotates towards the vacuum interrupter until the high-voltage switchgear is closed in place. At the same time, the upper moving contact provides bottom support for the moving contact plate, and an electrical connection is established between the upper moving contact and the moving contact plate. When the high-voltage switchgear moves to open position or operates, causing the upper moving contact to move to open position, the upper moving contact releases its bottom support for the moving contact plate, and the moving contact plate rotates away from the vacuum interrupter. The power connector has a power input end that is connected to and electrically connected to the moving contact plate, and a power output end that is used to connect to the moving electrode of the vacuum interrupter, so as to convert the rotational motion of the moving contact plate into the reciprocating linear motion of the power output end of the power connector along the opening and closing direction, thereby driving the moving electrode of the vacuum interrupter connected thereto to perform reciprocating linear motion synchronously, so that the vacuum interrupter can perform opening and closing actions.

2. The upper contact device according to claim 1, characterized in that, The power connector is slidably inserted through the contact bracket along the opening and closing direction. The input end of the power connector is connected to the moving contact plate. The moving contact plate is provided with a swing hole. The power connector is slidably inserted through the swing hole along the length direction of the swing hole. It is used to drive the power connector to perform reciprocating linear motion in the vertical direction when the swing hole rotates with the moving contact plate.

3. The upper contact device according to claim 2, characterized in that, The yaw hole is a circular hole, elongated through hole, or oblong hole formed on the movable contact plate with a diameter larger than that of the power connector. Its length extends along the surface of the movable contact plate and is used to generate a thrust on the power connector when the movable contact plate rotates, so as to convert the rotational motion of the movable contact plate into the reciprocating linear motion of the power connector.

4. The upper contact device according to claim 2, characterized in that, The power connection component is a bolt member, which is provided with two adjusting nuts that are threadedly connected to the bolt member and arranged at intervals. The two adjusting nuts are respectively clamped on both sides of the moving contact plate so that the moving contact plate can only deflect between the two adjusting nuts. This ensures that when the moving contact plate deflects, it drives the adjusting nuts to move up and down, thereby driving the bolt member to move up and down. By adjusting the position of the adjusting nuts on the bolt member, the contact opening distance of the vacuum interrupter can be adjusted.

5. The upper contact device according to claim 1, characterized in that, The power connector passes through the contact bracket. The input end of the power connector is hinged to the moving contact plate, and the output end of the power connector is hinged to the moving electrode of the vacuum interrupter, forming a crank-slider structure to convert the rotation of the moving contact plate into the reciprocating linear movement of the moving electrode of the vacuum interrupter.

6. The upper contact device according to any one of claims 1 to 5, characterized in that, The contact support is a horizontal U-shaped structure, comprising: a top support plate, a bottom support plate, and a vertical connecting plate; wherein... The bottom support plate is arranged parallel to the lower side of the top support plate and is used to limit and support the moving contact plate so that the moving contact plate supports the bottom support plate in a free state, thereby limiting the moving electrode to the lower open position. The vertical connecting plate is disposed between the top support plate and the bottom support plate, and both ends of the vertical connecting plate are connected to the top support plate and the bottom support plate, respectively.

7. The upper contact device according to claim 6, characterized in that, The top support plate has side support plates extending downwards on both sides of the end away from the vertical connecting plate. The side support plates are provided with hinge holes for installing and fixing the connecting shaft.

8. The upper contact device according to any one of claims 1 to 5, characterized in that, The contact support is also provided with an auxiliary contact, which is located on the pressing side of the moving contact plate and is rotatably mounted on the contact support. It is used to support the falling side of the upper moving contact of the high voltage switchgear to limit and secure it laterally.

9. The upper contact device according to claim 8, characterized in that, A second elastic reset member is provided between the auxiliary contact and the contact support. When the upper moving contact is gradually inserted into the moving contact plate and the auxiliary contact is pushed to rotate towards the vacuum interrupter, it is twisted or compressed and stores energy. After the upper moving contact is locked in place, the energy is released to drive the auxiliary contact to reset to the lower locking position, thereby laterally locking and limiting the upper moving contact.

10. The upper contact device according to any one of claims 1 to 5, characterized in that, A first elastic reset member is provided between the moving contact plate and the contact support. When the upper moving contact is gradually inserted into the moving contact plate and pushes the moving contact plate towards the vacuum interrupter for closing rotation, it is compressed and stores energy. When the moving contact plate loses its bottom positive position hard support, it releases energy to drive the moving contact plate to open rotation, so as to reset to the lower deflection position, and drive the moving electrode of the vacuum interrupter to reset to the lower open position.

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