A combined selector switch

Abstract

The application discloses a combined phase selector switch, which comprises a vacuum arc-extinguishing chamber, a disconnecting switch and a grounding switch, a permanent magnet mechanism is arranged on the vacuum arc-extinguishing chamber, the permanent magnet mechanism is suitable for independently controlling the vacuum arc-extinguishing chamber to perform opening and closing actions, the disconnecting switch is matched with a first end of the vacuum arc-extinguishing chamber, and the grounding switch is matched with a second end of the vacuum arc-extinguishing chamber; and the combined phase selector switch further comprises an operating mechanism, which is suitable for performing opening and closing operations on the disconnecting switch and the grounding switch. The combined phase selector switch has the beneficial effects that the permanent magnet mechanism is used for independently opening and closing each-phase vacuum arc-extinguishing chamber, the opening and closing phases can be controlled, the impact of overvoltage and inrush current on the system is reduced, the permanent magnet mechanism has high reliability, and the overall service life of the system is prolonged; the combined phase selector switch further integrates the functions of the disconnecting switch and the grounding switch, the operating mechanism and the permanent magnet mechanism independently control corresponding switches, and the use convenience and flexibility are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electrical switching devices, in particular to a combined phase selection switch. BACKGROUND

[0002] Photovoltaic power generation generates power during the day, but does not generate power at night or on rainy days, so the step-up transformer often operates in an empty state; once the photovoltaic power generation system is connected to the grid, the equipment in the station will always be connected to the grid, that is, whether in a power generation state or in a standby state at night or on rainy days, the step-up transformer and other equipment will always consume power from the grid. Therefore, for a photovoltaic power station at night, the step-up transformer is disconnected by a controller, so that the active and reactive power losses of the transformer in the empty state can be completely solved.

[0003] However, the transformer will generate a magnetizing inrush current when the transformer is energized and closed, which is an inherent characteristic of the transformer. In addition, according to the 30-year service life of the photovoltaic power generation system, the switch is turned on and off at least once a day, and the mechanical service life of the switch in its life cycle should reach 30,000 times. In the prior art, a linkage assembly of a combined vacuum circuit breaker is disclosed in CN201911355075.0, but the vacuum circuit breaker is a three-phase synchronous action, which cannot be used for three-phase controllable operation, and thus cannot solve the problem of the magnetizing inrush current generated when the transformer is energized and closed. Therefore, a combined phase selection switch is proposed to solve the above technical problems. SUMMARY

[0004] One of the purposes of the application is to provide a combined phase selection switch with a long service life.

[0005] To achieve the above purposes, the technical scheme adopted by the application is as follows: a combined phase selection switch, comprising a vacuum arc-extinguishing chamber, a disconnecting switch and a grounding switch, a permanent magnet mechanism is arranged on the vacuum arc-extinguishing chamber, the permanent magnet mechanism is adapted to independently control the vacuum arc-extinguishing chamber to perform opening and closing actions, the disconnecting switch is matched with a first end of the vacuum arc-extinguishing chamber, and the grounding switch is matched with a second end of the vacuum arc-extinguishing chamber; further comprising an operating mechanism adapted to perform opening and closing operations on the disconnecting switch and the grounding switch.

[0006] Preferably, the vacuum arc-extinguishing chamber is horizontally installed on a frame and arranged side by side through a through-wall fixed pole, the permanent magnet mechanism is installed on the frame and located above the vacuum arc-extinguishing chamber, and the driving end of the permanent magnet mechanism is connected with the moving contact of the vacuum arc-extinguishing chamber through a transmission assembly; the permanent magnet mechanism is adapted to independently control the transmission assembly to perform opening and closing actions on the vacuum arc-extinguishing chamber.

[0007] Preferably, the transmission assembly comprises an insulating pull rod and a transmission crank, the transmission crank is rotatably installed on the bracket at the end of the vacuum interrupter, the first end of the insulating pull rod is connected with the driving end of the permanent magnet mechanism, the second end of the insulating pull rod is connected with the top end of the transmission crank, and the bottom end of the transmission crank is connected with the movable contact; during the opening / closing process of the vacuum interrupter, the axis of the insulating pull rod and the axis of the driving end of the permanent magnet mechanism at least instantaneously coincide once.

[0008] Preferably, during the closing process, the permanent magnet mechanism is adapted to drive the movable contact to move through the insulating pull rod and the transmission crank, and the insulating pull rod is adapted to rotate away from the driving end of the permanent magnet mechanism; when in the closed state, the axis of the insulating pull rod coincides with the axis of the driving end of the permanent magnet mechanism.

[0009] Preferably, the permanent magnet mechanism and the insulating pull rod are both arranged obliquely, so that the connection point of the insulating pull rod and the transmission crank approaches the rotation center of the transmission crank.

[0010] Preferably, the operating mechanism comprises an operating panel, an isolation operating shaft, a grounding operating shaft, a first interlocking piece and a second interlocking piece, the isolation operating shaft and the grounding operating shaft are arranged on the operating panel, the first interlocking piece is installed on the isolation operating shaft, and the second interlocking piece is installed on the grounding operating shaft; the first interlocking piece and the second interlocking piece are matched through a limiting structure; when the disconnecting switch is closed, the first interlocking piece is adapted to block the grounding operating shaft, and the second interlocking piece is adapted to be locked under the action of the limiting structure, so that the grounding operating shaft is in a locked and inoperable state; when the grounding switch is closed, the second interlocking piece is adapted to block the isolation operating shaft, and the first interlocking piece is adapted to be locked under the action of the limiting structure, so that the isolation operating shaft is in a locked and inoperable state.

[0011] Preferably, the interlocking part one comprises an interlocking disc one and a baffle one, the interlocking disc one is sleeved and installed on the isolation operating shaft, and the baffle one is installed on the interlocking disc one; the interlocking part two comprises an interlocking disc two and a baffle two, the interlocking disc two is sleeved and installed on the grounding operating shaft, and the baffle two is installed on the interlocking disc two; the interlocking disc one and the interlocking disc two are matched through the limiting structure; when the disconnecting switch is closed, the isolation operating shaft is adapted to drive the baffle one to rotate through the interlocking disc one and block the grounding operating shaft, at this time, the interlocking disc one is adapted to make the interlocking disc two be locked through the limiting structure; when the grounding switch is closed, the grounding operating shaft is adapted to drive the baffle two to rotate through the interlocking disc two and block the isolation operating shaft, at this time, the interlocking disc two is adapted to make the interlocking disc one be locked through the limiting structure.

[0012] Preferably, the limiting structure comprises a notch one arranged outside the interlocking disc one and a notch two arranged outside the interlocking disc two; when the disconnecting switch is in the closed state, the interlocking disc one is matched with the notch two, thereby locking the grounding operating shaft in the circumferential direction; when the grounding switch is in the closed state, the interlocking disc two is matched with the notch one, thereby locking the isolation operating shaft in the circumferential direction.

[0013] Preferably, the operating panel is provided with a circuit breaker opening and closing indication and an interlocking plate one, the interlocking plate one is slidingly arranged on the operating panel; when the circuit breaker switch is closed, the circuit breaker opening and closing indication is adapted to abut against one end of the interlocking plate one and lock the interlocking plate one, so that the other end of the interlocking plate one blocks the isolation operating shaft.

[0014] Preferably, the operating panel is slidingly provided with an interlocking plate two, an end of the interlocking plate two is provided with a lock pin of a switch chamber door plate, and the interlocking plate two is matched with the interlocking disc two; when the grounding switch is opened, the interlocking disc two is adapted to lock the interlocking plate two, at this time, the switch chamber door plate is in the locked state under the action of the lock pin; when the grounding switch is closed, the interlocking disc two is adapted to release the locking of the interlocking plate two, at this time, the interlocking plate two is adapted to drive the lock pin to move and release the locking of the switch chamber door plate.

[0015] Compared with the prior art, the application has the beneficial effects that:

[0016] (1) The independent opening and closing operation of the vacuum arc-extinguishing chamber of each phase is implemented by the permanent magnet mechanism, the opening and closing phase can be controlled, and the impact of overvoltage and inrush current on the system is reduced. Moreover, the permanent magnet mechanism itself has strong reliability, and the number of actions can reach more than 100,000 times, which can significantly improve the overall service life of the system. In addition, the phase selection switch also integrates the functions of the disconnecting switch and the grounding switch, and the disconnecting switch and the grounding switch are arranged at the two end positions of the vacuum arc-extinguishing chamber, so that the overall structure is more compact, and the convenience and flexibility of use are improved. Furthermore, the operating mechanism and the permanent magnet mechanism independently control the corresponding switches, and realize the function control of the phase selection circuit breaker, the disconnecting switch and the grounding switch.

[0017] (2) The driving end axis of the permanent magnet mechanism and the insulating pull rod axis are designed to be close to coincide, so that the radial component of the insulating pull rod on the moving core rod is significantly reduced during opening and closing. Therefore, the friction force between the moving core rod of the permanent magnet mechanism and the guide sleeve is smaller when they slide relative to each other, so that the movement is smoother, the wear is reduced, and the service life of the permanent magnet mechanism is greatly improved.

[0018] (3) The permanent magnet mechanism and the insulating pull rod are designed in an inclined manner, and the length of the transmission crank is selected according to the ratio of the power arm and the resistance arm, so that the moving core rod has a suitable stroke to meet the opening and closing requirements of the moving contact, and the space is compact and the stress is reasonable.

[0019] (4) The interlocking piece one, the interlocking piece two and the limiting structure are arranged, the interlocking piece one cooperates with the limiting structure to block and lock the grounding operation shaft when the disconnecting switch is closed. When the grounding switch is closed, the interlocking piece two cooperates with the limiting structure to block and lock the isolation operation shaft. Thus, the double locking function is realized, and the safety of the switch device is further improved.

[0020] (5) The emergency opening mechanism is arranged, when the circuit breaker switch fails and needs to be opened urgently, the magnetic attraction of the permanent magnet mechanism can be overcome, so that the circuit breaker switch is forced to open, the circuit is cut off in time, and the fault is prevented from expanding. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the rear view of the present application.

[0022] Figure 2 It is a three-dimensional structure schematic diagram of the front view of the present application.

[0023] Figure 3 It is a disconnecting switch closing, vacuum arc-extinguishing chamber closing and grounding switch opening state schematic diagram of the present application.

[0024] Figure 4 The schematic diagram of the isolating switch opening, vacuum arc-extinguishing chamber opening and grounding switch closing state of the present application.

[0025] Figure 5 The schematic diagram of the magnetic control mechanism opening state of the present application.

[0026] Figure 6 The schematic diagram of the magnetic control mechanism closing state of the present application.

[0027] Figure 7 The schematic diagram of the magnetic control mechanism horizontal setting and the insulating pull rod inclined setting installation.

[0028] Figure 8 The schematic diagram of the permanent magnet mechanism and the insulating pull rod horizontal installation setting installation.

[0029] Figure 9 The schematic diagram of the permanent magnet mechanism inclined installation and the insulating pull rod horizontal setting installation.

[0030] Figure 10 The schematic diagram of the A place enlarged structure of the present application.

[0031] Figure 11 The schematic diagram of the three-dimensional structure of the guide plate and the limiting plate of the present application.

[0032] Figure 12 The schematic diagram of the Figure 10 The schematic diagram of the sectional structure.

[0033] Figure 13 The schematic diagram of the B place enlarged structure of the present application.

[0034] Figure 14 The schematic diagram of the Figure 2 The schematic diagram of the local structure.

[0035] Figure 15 The schematic diagram of the three-dimensional structure of the operating mechanism of the present application.

[0036] Figure 16 The schematic diagram of the front view structure of the operating mechanism of the present application.

[0037] Figure 17 The schematic diagram of the internal structure of the operating mechanism of the present application.

[0038] Figure 18 The schematic diagram of the two interlocking pieces state of the circuit breaker closing, isolating switch closing and grounding switch opening of the present application.

[0039] Figure 19 The schematic diagram of the two specific structures of the interlocking plate of the present application.

[0040] Figure 20Structure diagram of the cooperation between the blocking strip and the protruding part of the present application.

[0041] Figure 21 Structure diagram of the cooperation between the two interlocking parts when the breaker is opened, the disconnector is opened and the grounding switch is opened of the present application.

[0042] Figure 22 Structure diagram of the present application from the top view.

[0043] Figure 23 Structure diagram of the cooperation between the two interlocking discs when the disconnector is closed and the grounding switch is opened of the present application.

[0044] Figure 24 Structure diagram of the cooperation between the two interlocking discs when the disconnector is opened and the grounding switch is closed of the present application.

[0045] In the figure: 1, frame; 2, vacuum interrupter; 3, transmission assembly; 301, insulating pull rod; 302, transmission crank; 4, permanent magnet mechanism; 401, shell; 402, moving iron core; 403, coil; 404, static iron core; 405, moving core rod; 4051, mounting section; 4052, connecting section; 5, disconnector; 501, isolation knife switch; 502, isolation static contact; 6, grounding switch; 601, grounding knife switch; 7, operating mechanism; 8, connecting copper bar; 9, insulator; 10, conducting rod; 11, push rod; 12, overtravel spring; 13, opening spring; 14, spring pad; 15, mounting ring; 16, mounting pad; 17, guide block; 18, guide plate; 1801, mounting part; 1802, guide groove; 19, sensor; 20, limit plate; 2001, sliding part; 21, clamping groove; 22, nut; 23, mounting groove; 24, breaking main shaft; 25, crank block; 26, pin; 27, breaking transmission shaft; 28, reset tension spring; 29, connecting rod assembly; 2901, upper crank; 2902, connecting rod; 2903, lower crank; 30, cover; 31, operating panel; 32, isolation operating port; 33, grounding operating port; 34, electromagnetic lock; 35, lock pin; 36, lock catch; 37, interlocking part one; 3701, interlocking disc one; 3702, baffle one; 38, interlocking part two; 3801, interlocking disc two; 3802, baffle two; 39, counter; 40, breaker opening and closing indication; 41, interlocking plate one; 42, interlocking plate two; 4201, blocking strip; 43, emergency opening port; 44, protruding part; 45, isolation operating shaft; 46, grounding operating shaft; 47, switch chamber door plate; 48, limit structure; 4801, notch one; 4802, notch two. DETAILED DESCRIPTION

[0046] Hereinafter, the present application will be further described with reference to the specific embodiments, it should be noted that the embodiments described below or the technical features between the embodiments can be combined arbitrarily to form new embodiments without conflict.

[0047] In the description of the present application, it should be noted that for orientation words such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0049] Further description of the prior art: photovoltaic power generation during the day, and no power generation at night or on rainy days, so the step-up transformer often runs empty. When the photovoltaic power generation system is connected to the grid, the equipment in the station will always be connected to the grid, that is, whether it is in a power generation state or in a standby state at night or on rainy days, the step-up transformer and other equipment will always consume power from the grid. According to calculations, only the standby loss at night, a 100-megawatt power station accumulates 8.02 million kilowatt-hours in 25 years, which is equivalent to about 4.81 million yuan in electricity prices, and this loss phenomenon is common in various photovoltaic power stations in China. Therefore, if the photovoltaic power station at night is disconnected from the step-up transformer through the controller, the active and reactive power losses of the transformer during no-load can be completely solved. However, the magnetizing inrush current of the transformer is generally 8-10 times the rated current. Therefore, when the transformer is energized, the relay protection may not be able to close the switch due to the magnetizing inrush current of the transformer, which is an inherent characteristic of the transformer.

[0050] According to the thirty-year life of the photovoltaic power generation system equipment, the switch is turned on and off at least once a day, and the mechanical life of the switch during its life cycle must reach 30,000 times, that is, the switch controlling the transformer must have the ability to operate frequently. Therefore, the switch device for switching the transformer must have two abilities: the ability to operate frequently and the ability to suppress the inrush current of the transformer during energization.

[0051] Therefore, the inventors of the present application have developed a combined phase selection switch, which has multiple phases, and one embodiment thereof is as shown in Figures 1 to 24As shown, each phase includes a vacuum interrupter 2, a disconnecting switch 5 and a grounding switch 6, wherein a permanent magnet mechanism 4 is arranged on the vacuum interrupter 2, and the permanent magnet mechanism 4 can independently control the vacuum interrupter 2 to perform opening and closing actions; the disconnecting switch 5 is installed in cooperation with the first end of the vacuum interrupter 2, and the grounding switch 6 is matched with the second end of the vacuum interrupter 2; further comprising an operating mechanism 7, and the operating mechanism 7 can perform opening and closing actions on the disconnecting switch 5 and the grounding switch 6.

[0052] It should be known that the vacuum interrupter 2 is the core component of the circuit breaker switch, that is, the opening and closing actions of the vacuum interrupter 2 determine the opening and closing state of the circuit breaker; and the vacuum interrupter 2 of each phase is configured with a separately controlled permanent magnet mechanism 4, which can be used for three-phase controllable operation, for example, when the circuit breaker switch is closed, it can accurately select to close at a specific point of the voltage waveform (usually the voltage zero-crossing point), which can effectively suppress or even eliminate the phenomenon of closing inrush current, and has high reliability, generally more than 100,000 times, greatly improving the overall service life of the system switch. In addition, the selected phase switch also integrates the functions of the disconnecting switch 5 and the grounding switch 6, improving the convenience and flexibility of use, and the overall structure is more compact; and the operating mechanism 7 can perform opening and closing operations on the disconnecting switch 5 and the grounding switch 6, that is, the operating mechanism 7 and the permanent magnet mechanism 4 are independent of each other, and realize the function control of the selected phase circuit breaker, the disconnecting switch 5 and the grounding switch 6.

[0053] Further, as shown in Figure 1 and Figure 2 , the vacuum interrupter 2 can be horizontally installed on the frame 1 through the wall type solid sealed pole, that is, the vacuum interrupter 2 and the conducting rod 10 are integrally cast by epoxy resin. And a plurality of vacuum interrupters 2 are arranged side by side at the upper end of the frame 1, and the permanent magnet mechanism 4 is installed on the frame 1 and located above the corresponding vacuum interrupter 2, and the driving end (i.e. the moving core rod 405) of the permanent magnet mechanism 4 is connected between the transmission assembly 3 and the moving contact of the vacuum interrupter 2. The disconnecting switch 5 is installed on the upper left side of the frame 1, which mainly includes an isolation knife switch 501 and an isolation static contact 502, wherein the top end of the isolation knife switch 501 is rotatably installed at the position of the conducting rod 10 on the left end of the solid sealed pole, and the isolation static contact 502 can be installed on the lower left side of the frame 1 through the insulator 9. The grounding switch 6 mainly includes a grounding knife switch 601 and a grounding shaft, the grounding knife switch 601 is rotatably installed at the lower right side of the frame 1 through the grounding shaft, and a connecting copper bar 8 is installed in the middle of the right side of the frame 1 through the insulator 9, and the connecting copper bar 8 can be connected with the moving contact at the right end of the vacuum interrupter 2 through a soft connection. As shown in Figure 3 , it is the state of the closing of the disconnecting switch 5, the closing of the vacuum interrupter 2 and the opening of the grounding switch 6; as shown in Figure 4 , it is the state of the opening of the disconnecting switch 5, the opening of the vacuum interrupter 2 and the closing of the grounding switch 6.

[0054] It can be understood that when opening and closing, the permanent magnet mechanism 4 will independently control the transmission assembly 3 to control the moving contact, thereby realizing the opening and closing action of the vacuum interrupter 2. The vacuum interrupter 2 adopts a through-wall type solid sealed pole arrangement, which can be divided into left and right functional areas by the frame 1. As shown in Figure 3 and Figure 4 , the left side is the isolating switch 5 area, and the isolating static contact 502 is connected with the live cable outside; the right side is the circuit breaker area connected with the transformer area, and the through-wall type solid sealed pole electrically connects the two functional areas, and the left and right functional areas can form independent metal compartments. Specifically, when it is necessary to enter the right compartment for maintenance, the vacuum interrupter 2 is opened by the permanent magnet mechanism 4, the electrical connection between the left and right compartments is cut off, then the isolating knife switch 501 is opened by the operating mechanism 7, so that the incoming line cable forms a visible break with the right compartment, and finally the grounding knife switch 601 is closed by the operating mechanism 7, at this time the right circuit breaker area is grounded with the frame 1, even if the incoming line cable is still live, the maintenance personnel can safely enter the compartment for operation. In addition, the vacuum interrupter 2 and the permanent magnet mechanism 4 are installed in such a coordinated manner, which has the advantages that the structure design is compact, convenient for installation and use in limited space, and can better cooperate with the isolating switch 5 and the grounding switch 6, and the three switches are dispersedly arranged on the frame 1.

[0055] Further, as shown in Figure 5 , the transmission assembly 3 includes an insulating pull rod 301 and a transmission crank arm 302, wherein the transmission crank arm 302 is rotatably installed on the bracket at the right end of the vacuum interrupter 2, the first end (left end) of the insulating pull rod 301 is rotatably connected with the driving end (i.e. the moving core rod 405) of the permanent magnet mechanism 4 through the pin 26, the first end (bottom end) of the transmission crank arm 302 is movably connected with the moving contact (for example, the cooperation of the pin and the groove), and the second end (top end) of the transmission crank arm 302 is hingedly connected with the second end of the insulating pull rod 301. It can be understood that when opening and closing, the permanent magnet mechanism 4 drives the insulating pull rod 301 to move through the moving core rod 405, and the insulating pull rod 301 drives the transmission crank arm 302 to rotate, and the transmission crank arm 302 drives the moving contact to move to open and close the circuit breaker.

[0056] Based on the above embodiment, the phase selection circuit breaker has the following problems when closing: as shown in Figure 12 , the permanent magnet mechanism 4 mainly includes a shell 401, a moving iron core 402, a moving core rod 405, a static iron core 404, a coil 403 and the like, and the specific installation structure and principle are also prior art. When opening and closing, the moving core rod 405 is driven to move by the moving iron core 402, thereby realizing the opening and closing control of the vacuum interrupter 2. As shown inFigure 7 As shown, the axis of the insulating pull rod 301 is inclined to the axis of the drive end (i.e., the moving core rod 405) of the permanent magnet mechanism 4 (shown by the dashed line in the figure). Therefore, the reaction force F of the insulating pull rod 301 on the moving core rod 405 can be decomposed into a component force F along its axial direction. 轴 and its radial component F 径 It is clear that the moving core rod 405 is subjected to F 径 The larger the value, the greater the wear between the moving core rod 405 and the bushing that guides it; therefore, F... 径 It is a key factor affecting its service life.

[0057] It should be known that F 径 The size depends on the relative tilt angle between the moving core rod 405 and the insulating tie rod 301 (i.e., the tilt angle and F). 径 (They are positively correlated), so it is only necessary to ensure that during the closing and opening of the vacuum interrupter 2, the axes of the moving core rod 405 and the insulating pull rod 301 are nearly coincident. Figure 5 As shown, for example, the relative inclination angle between the moving core rod 405 and the insulating tie rod 301 is between 1° and 3°, and their axes coincide at least once during opening and closing. Thus, the radial component F of the insulating tie rod 301 on the moving core rod 405... 径 It will decrease significantly. Furthermore, F 径 The smaller the value, the less sliding friction between the moving core rod 405 and the moving iron core 402, resulting in smoother movement, reduced wear, and extended service life of the permanent magnet mechanism 4.

[0058] In addition, when the moving core rod 405 is in the closed state, or at the moment of closing, the reaction force it receives is the greatest. At this time, the axes of the two coincide, which minimizes the radial component force on the moving core rod 405, thereby minimizing the impact on the moving core rod 405 and thus ensuring the closing force to a great extent.

[0059] The permanent magnet mechanism 4 and the insulating tie rod 301 can be installed in various ways, for example: Figure 8 As shown, both are installed horizontally. Let the rotation point of the transmission crank arm 302 be O. Using point O as the boundary, the transmission crank arm 302 is divided into an upper first segment and a lower second segment. The first segment, connected to the insulating pull rod 301, is the power arm, and the second segment, connected to the moving contact, is the resistance arm. It is worth noting that, as... Figure 1As shown, the current transformer is installed outside the solid-sealed pole, so a certain distance needs to be kept between the installation position of the permanent magnet mechanism 4 and the vacuum arc-extinguishing chamber 2; at this time, the ratio of the power arm to the resistance arm is larger, so the permanent magnet mechanism 4 needs a larger stroke to meet the opening and closing requirements. In addition, if the O point is set too high, the support bracket at the right end of the solid-sealed pole will bear a larger bending moment when the switch is closed, affecting the stress distribution. As shown in Figure 7 , the permanent magnet mechanism 4 is horizontally installed, and the insulating pull rod 301 is inclinedly arranged; as shown in Figure 9 , the permanent magnet mechanism 4 is inclinedly installed, and the insulating pull rod 301 is horizontally installed; both of them solve the stroke problem of the permanent magnet mechanism 4, but will bring the problem of radial component.

[0060] Therefore, in order to solve the above technical problems, as shown in Figure 6 , the permanent magnet mechanism 4 and the insulating pull rod 301 are both arranged in an inclined manner, so that the connection point of the insulating pull rod 301 and the transmission crank arm 302 is close to the O point (i.e. the power arm is shortened), the purpose of which is to reduce the ratio of the power arm to the resistance arm, so that the moving core rod 405 has a suitable stroke to meet the opening and closing requirements of the moving contact, and the axes of the moving core rod 405 and the insulating pull rod 301 are also in a state of tending to coincide, and the problem caused by the radial component is also solved.

[0061] It should be noted that in actual design, the ratio of the power arm to the resistance arm should not be too small, otherwise a larger magnetic force is needed to drive the closing; therefore, a reasonable length of the transmission crank arm 302 needs to be selected according to the ratio of the power arm to the resistance arm, so that the space is compact and the stress is reasonable.

[0062] In the embodiment, as shown in Figures 10 to 12 , the moving core rod 405 penetrates the moving iron core 402 and the end thereof is locked and connected with the moving iron core 402 through a connecting piece, and a limiting piece is installed on the moving iron core 402 and can lock and limit the connecting piece, so that the moving iron core 402 and the moving core rod 405 remain in a locked and connected state.

[0063] It can be understood that through the arrangement of the limiting piece, the connecting piece cooperated by the moving iron core 402 and the moving core rod 405 can be locked and limited, so that the connecting piece will not be loose under the action of a larger impact force when the moving iron core 402 is closed, thereby greatly improving the overall stability and service life of the permanent magnet mechanism 4.

[0064] As a further description of the above embodiment, the connecting piece generally adopts a nut 22, and the specific installation mode of the moving core rod 405 is as shown in Figure 12As shown, the moving core rod 405 includes a mounting section 4051 and a connecting section 4052, the diameter of the mounting section 4051 is smaller than that of the connecting section 4052, that is, the mounting section 4051 is thin and the connecting section 4052 is thick; when installing the moving core rod 405, the moving core rod 405 is inserted through the static iron core 404 from the right end of the shell 401, then the mounting section 4051 is made to pass through the moving iron core 402, the left end of the mounting section 4051 is threaded, finally the nut 22 is tightened at the left end of the mounting section 4051, at this time the nut 22 and the connecting section 4052 abut at the position on the left side of the moving iron core 402, thereby realizing the locking connection of the moving iron core 402 and the moving core rod 405, the installation method is simple, and the disassembly and assembly efficiency is improved.

[0065] Further, in order to better hide the installed nut 22, that is, not to protrude at the position on the left side of the moving iron core 402, a mounting groove 23 can be arranged on the left side of the moving iron core 402, so that the tightened nut 22 can be located in the mounting groove 23, which can make the overall structure of the permanent magnet mechanism 4 more compact, without protruding, and also improve the aesthetics of the permanent magnet mechanism 4.

[0066] As shown, Figure 10 The limiting piece is a limiting plate 20, and a clamping groove 21 is arranged on the side of the limiting plate 20. Specifically, the limiting plate 20 can be installed on the left side of the moving iron core 402 by screws, at this time the clamping groove 21 is matched with the nut 22, so that the nut 22 cannot rotate under the limiting action of the clamping groove 21, that is, the nut 22 is locked in the circumferential direction. As can be seen, through such design, no matter how great the impact force acting on the permanent magnet mechanism 4 when closing, the nut 22 will not loosen, thereby ensuring the stability of the installation and improving the service life.

[0067] In this embodiment, as shown, Figure 10 A guide plate 18 can be arranged on both sides of the shell 401, the guide plate 18 can be installed on the frame body 1 by bolts, of course, it can also be installed outside the shell 401, both ends of the limiting plate 20 are bent to form a sliding part 2001 which is integrally formed with the limiting plate 20, the outer side of the guide plate 18 is provided with a guide groove 1802, the sliding part 2001 cooperates with the guide groove 1802 to realize the sliding cooperation of the limiting piece and the guide plate 18. The purpose is to further prevent the rotation of the limiting plate 20, so that the transmission chain such as the moving iron core 402 and the moving core rod 405 cannot rotate, that is, can only move in the axial direction of the permanent magnet mechanism 4, so that the threaded mounting structure on the transmission chain can always be in a fastened state and will not loosen due to rotation, greatly improving the stability and reliability of the whole.

[0068] Further, a sensor 19 (i.e. a closing / opening signal sensor or a proximity switch) is mounted on the side of one of the guide plates 18, and the sensor 19 cooperates with the corresponding sliding part 2001. It can be understood that the sensor 19 can monitor the opening / closing state of the permanent magnet mechanism 4 in real time by detecting the distance between the sensor 19 and the sliding part 2001.

[0069] Further, in order to facilitate the installation of the sensor 19, the single-sided connecting piece is outwardly bent to form a mounting portion 1801 in the guide groove 1802, and the mounting portion 1801 can be provided with a mounting hole for mounting the sensor 19; it should be noted that the single-sided connecting piece refers to a connecting piece connected to the guide groove 1802 on one side only.

[0070] It should be noted that the installation of the entire permanent magnet mechanism 4 is also simple and convenient, as shown in Figure 10 ① first, the permanent magnet mechanism 4 is fixedly installed on the frame body 1 through the cooperation of the shell 401 and the bolts. ② The movable core rod 405 is inserted into and penetrates the static iron core 404 from the right end of the shell 401, and then the mounting section 4051 penetrates the movable iron core 402 and extends into the mounting groove 23, and the nut 22 is tightened on the left end of the mounting section 4051. As shown in Figure 10 ③ the limiting plate 20 is installed on the outside of the movable iron core 402 by screws / bolts, and the clamping groove 21 on the limiting plate 20 cooperates with the nut 22 to prevent the nut 22 from rotating when it is impacted. ④ The guide plates 18 are installed on both sides of the shell 401 by screws / bolts, and after installation, the sliding part 2001 cooperates with the guide groove 1802, and the sensor 19 cooperates with the corresponding sliding part 2001.

[0071] In the embodiment, as shown in Figure 6 the end of the movable contact is rigidly (fixedly) connected with a push rod 11, the push rod 11 is externally sleeved with an opening spring 13, an overtravel spring 12, a mounting pad 16, a spring pad 14 and a guide block 17, the left end of the opening spring 13 is connected with a support at the end of the vacuum arc-extinguishing chamber 2 through a mounting ring 15, the right end of the opening spring 13 is connected with the mounting pad 16, the overtravel spring 12 is located between the spring pad 14 and the mounting pad 16, the spring pad 14 abuts against the middle section of the push rod 11, the guide block 17 is movably arranged at the right end of the push rod 11 and abuts against the mounting pad 16, the guide block 17 is movably connected with the second end of the transmission crank 302, the overtravel spring 12 is located inside the opening spring 13, and a gasket is installed on the right end of the push rod 11 by bolts to finally limit and lock the sleeved and installed parts.

[0072] It can be understood that the over-travel spring 12 compensates for the contact wear of the vacuum interrupter 2 and buffers the closing force, and its working principle is not described again in the prior art. The above-mentioned mounting structure of the moving contact is adopted, that is, the matching mode of sleeving and abutting each other, which is compact in structure and good in overall stability. In addition, it is convenient to assemble and maintain, for example, only by disassembling the right end bolt, the sleeved parts can be disassembled in sequence, greatly improving the disassembly efficiency.

[0073] In one embodiment of the present application, as shown in Figure 1 and Figure 2 , how the operating mechanism 7 installed beside the frame body 1 operates the disconnecting switch 5 and the grounding switch 6 is also the common knowledge of those skilled in the art, so the specific structure and principle of the operating mechanism 7 are not described in detail here. The switch combines the (selective) circuit breaker switch, the disconnecting switch 5 and the grounding switch 6, among which the circuit breaker switch is electrically controlled, and the disconnecting switch 5 and the grounding switch 6 are mechanically opened and closed by the operating mechanism 7, so the limit interlocking between the disconnecting switch 5 and the grounding switch 6 is crucial.

[0074] As shown in Figure 18 , the operating mechanism 7 includes an operating panel 31, an isolation operating shaft 45, a grounding operating shaft 46, an interlocking piece one 37 and an interlocking piece two 38, wherein the isolation operating shaft 45 and the grounding operating shaft 46 are arranged on the operating panel 31, the interlocking piece one 37 is installed on the isolation operating shaft 45, the interlocking piece two 38 is installed on the grounding operating shaft 46, and the interlocking piece one 37 and the interlocking piece two 38 are matched by a limiting structure 48. It should be known that the isolation operating shaft 45 and the grounding operating shaft 46 can operate the corresponding disconnecting switch 5 and grounding switch 6 under the action of the operating handle, which is also the common knowledge of those skilled in the art.

[0075] It can be understood that when the disconnecting switch 5 is closed, the interlocking piece one 37 can block the grounding operating shaft 46 under the action of the isolation operating shaft 45 (i.e. block the isolation operating port 32 on the operating panel 31), and the interlocking piece two 38 is locked under the action of the limiting structure 48, so that the grounding operating shaft 46 is in a locked and inoperable state. Similarly, when the disconnecting switch 5 is opened, the grounding operating shaft 46 is unblocked and locked; then the grounding operating shaft 46 is inserted into the operating handle to close the grounding switch 6, at this time the interlocking piece two 38 can block the isolation operating shaft 45 under the action of the grounding operating shaft 46 (i.e. block the grounding operating port 33 on the operating panel 31), and the interlocking piece one 37 is locked under the action of the limiting structure 48, so that the isolation operating shaft 45 is in a locked and inoperable state.

[0076] Therefore, through the cooperation of the interlocking piece one 37, the interlocking piece two 38 and the limiting structure 48, the interlocking between the disconnecting switch 5 and the grounding switch 6 can be realized; and when interlocking, not only the other operating shaft can be blocked so that the operating handle cannot be inserted, but also the double locking function can be realized, further improving the safety of the switch device.

[0077] The specific structure of the interlocking piece one 37 and the interlocking piece two 38 is not limited in the present application, and a specific embodiment is provided below for reference:

[0078] As shown in Figure 18 and Figure 21 , the interlocking piece one 37 includes an interlocking disc one 3701 and a baffle one 3702, the interlocking disc one 3701 is fixedly sleeved and installed at the end of the isolation operating shaft 45, and the baffle one 3702 is installed outside the interlocking disc one 3701. The interlocking piece two 38 includes an interlocking disc two 3801 and a baffle two 3802, the interlocking disc two 3801 is fixedly sleeved and installed at the end of the grounding operating shaft 46, and the baffle two 3802 is installed outside the interlocking disc two 3801; the interlocking disc one 3701 and the interlocking disc two 3801 are cooperated through the limiting structure 48.

[0079] It can be understood that when the disconnecting switch 5 is closed, that is, the isolation operating shaft 45 is rotated by the operating handle, and then the interlocking disc one 3701 rotates and drives the baffle one 3702 to rotate synchronously, so that the baffle one 3702 blocks the grounding operating shaft 46, so that the operating handle cannot be inserted into the grounding operating shaft 46; and at this time, the interlocking disc one 3701 can also lock the interlocking disc two 3801 through the limiting structure 48, that is, realize double locking of the grounding operating shaft 46. Similarly, when the grounding switch 6 is closed, the rotation of the interlocking disc two 3801 can realize double locking of the isolation operating shaft 45.

[0080] As a further description of the above embodiment, as shown in Figure 23 and Figure 24 , the limiting structure 48 includes a notch one 4801 arranged outside the interlocking disc one 3701 and a notch two 4802 arranged outside the interlocking disc two 3801.

[0081] It can be understood that, as shown in Figure 23 , at this time the disconnecting switch 5 is in the closed state, the notch two 4802 of the interlocking disc two 3801 and the interlocking disc one 3701 are in the corresponding cooperation state, so that the interlocking disc two 3801 cannot rotate due to the blocking and limiting of the interlocking disc one 3701, and the interlocking disc two 3801 is fixedly connected with the grounding operating shaft 46, so that the grounding operating shaft 46 is in the locked state and cannot rotate. Similarly, as shown in Figure 24As shown, when the grounding switch 6 is in the closed state, the interlocking disc 3801 cooperates with the notch 4801 to lock the isolation operating shaft 45 so that it cannot rotate.

[0082] Furthermore, such as Figure 18 As shown, the operation panel 31 is also equipped with a circuit breaker opening / closing indicator 40 and an interlocking plate 41, and the interlocking plate 41 is slidably mounted on the operation panel 31. It should be noted that the circuit breaker opening / closing indicator 40 displays the opening / closing status of the circuit breaker switch, that is, the circuit breaker opening / closing indicator 40 moves (e.g., rotates or translates) with the opening / closing action of the circuit breaker switch, which is also a commonly used structural design in switchgear.

[0083] Specifically, the interlocking plate 41 is vertically slidably mounted on the operation panel 31. The top end of the interlocking plate 41 corresponds to the circuit breaker open / close indicator 40, and the bottom end of the interlocking plate 41 corresponds to the isolating operating shaft 45. When the circuit breaker is in the closed position, the circuit breaker open / close indicator 40 is abutted against the top end of the interlocking plate 41, and the interlocking plate 41 is in its lowest position, thus locking the interlocking plate 41. The bottom end of the interlocking plate 41 also blocks the isolating operating shaft 45, preventing the interlocking plate 41 from sliding upwards to expose and open the isolating operating shaft 45 (or the isolating operating port 32). When the circuit breaker is open, the circuit breaker open / close indicator 40 will move away from the interlocking plate 41, which will then move the interlocking plate 41 upwards to expose and open the isolating operating shaft 45. This achieves the interlocking requirement of preventing accidental operation of the grounding switch 6 and the isolating switch 5 when the circuit breaker is closed.

[0084] Furthermore, such as Figure 21 As shown, an interlocking plate 42 can also be horizontally slidably installed on the operation panel 31. A locking pin 35 of the switch room door panel 47 is installed at the end of the interlocking plate 42, and the interlocking plate 42 cooperates with the interlocking disc 3801.

[0085] Understandably, when the grounding switch 6 is closed, the interlocking disc 3801 can release the interlocking plate 42, meaning that the locking pin 35 can move left and right. This allows the switch compartment door 47 to be opened through the engagement of the locking pin 35 and the latch 36. Simultaneously, the baffle 3802 can also lock the isolating operating shaft 45. Conversely, if the grounding switch 6 is in the open state, such as... Figure 23 As shown, interlocking disc 3801 will lock interlocking plate 42, specifically as follows: Figure 19As shown in the lower part of the figure, the bottom end of the second interlocking plate 42 is bent inward to form a blocking strip 4201, and the outer periphery of the second interlocking disc 3801 is provided with a protruding portion 44; that is, the blocking strip 4201 on the second interlocking plate 42 and the protruding portion 44 on the second interlocking disc 3801 are in a corresponding matching state (as shown in the lower part of the figure of Figure 23 ), and the second interlocking plate 42 is in a locked state, that is, the locking pin 35 cannot move left and right, and at this time the locking pin 35 cooperates with the lock catch 36 to make the switch chamber door plate 47 in a locked state and cannot be opened. In this way, the requirement of the interlocking except the five-protection interlocking of the door plate can only be met when the grounding switch 6 is closed, further improving the safety.

[0086] Specifically, as shown in the lower part of the figure in Figure 24 and Figure 22 , after the grounding switch 6 is closed, the second interlocking plate 42 needs to be pushed to the left to separate the locking pin 35 and the lock catch 36, and then the switch chamber door plate 47 can be opened, at this time the second interlocking plate 42 is in a blocking state to the grounding operation port 33 to realize the locking of the grounding switch 6; the clamping column in the lock catch 36 will be popped out under the action of the elastic force, and will limit the position of the locking pin 35, so that the second interlocking plate 42 keeps the blocking state to the grounding operation port 33. Only when the switch chamber door plate 47 is closed, the switch chamber door plate 47 will squeeze the clamping column in the lock catch 36 inward, and then the limitation to the locking pin 35 is removed, at this time the locking pin 35 can be moved to the right into the corresponding pin hole on the lock catch 36 and the switch chamber door plate 47 through the second interlocking plate 42, so that the grounding operation port 33 can be exposed for operation. In general, only when the grounding switch 6 is closed, the switch chamber door plate 47 can be opened; only when the switch chamber door plate 47 is closed, the grounding switch 6 can be operated.

[0087] In order to facilitate understanding, the specific working principle of the interlocking part one 37, the interlocking part two 38 and the limiting structure 48 is described as follows:

[0088] ① Initial state (i.e. power-on state): as shown in Figure 18 , the circuit breaker switch is in a closed state, the top end of the first interlocking plate 41 is blocked by the circuit breaker on-off indicator 40 and cannot be moved upward, and the bottom end of the first interlocking plate 41 blocks the isolation operation port 32; at this time the disconnecting switch 5 is in a closed state and the grounding switch 6 is in an open state. As shown in the upper part of the figure in Figure 23 , the first interlocking disc 3701 is located in the gap two 4802 of the second interlocking disc 3801, and the second interlocking disc 3801 is locked; as shown in the lower part of the figure in Figure 23 , the blocking plate one 3702 blocks the grounding operation port 33, and the protruding portion 44 and the blocking strip 4201 correspond to each other, at this time the second interlocking plate 42 is in a limiting state, that is, the locking pin 35 cannot be moved horizontally to open the switch chamber door plate 47.

[0089] ② Power-off grounding operation: such as Figure 21 As shown, when the circuit breaker is open, the circuit breaker open / close indicator 40 rotates counterclockwise upwards, thereby releasing the limit on the interlock plate 41. Then, the interlock plate 41 can be moved upwards and lifted to expose the isolating operating port 32. The operating handle is then inserted into the isolating operating port 32, and the isolating operating shaft 45 is used to open the disconnecting switch 5. When the disconnecting switch 5 is in the open state, as... Figure 24 As shown in the diagram below, the baffle 3702 will rotate counterclockwise, exposing the grounding operating shaft 46. Then, the operating handle is inserted into the grounding operating port 33, thereby closing the grounding switch 6 via the grounding operating shaft 46. Figure 24 As shown in the diagram above, interlocking disc 2 3801 is located in notch 4801 of interlocking disc 1 3701, thereby locking interlocking disc 1 3701; as Figure 24 As shown in the figure below, the second baffle 3802 blocks the isolation operation port 32, and at this time the protrusion 44 and the baffle 4201 are misaligned (that is, the baffle 4201 and the second notch 4802 are in a corresponding state), which can push the second interlocking plate 42 to drive the locking pin 35 to move and open the switch room door 47.

[0090] It is worth mentioning that both interlocking disc 1 (3701) and interlocking disc 2 (3801) have simple structures, are easy to process and manufacture, and reduce production costs. Of course, corresponding "open" and "closed" markings can be engraved on the outside of both, thus indicating the open / closed status of the corresponding switches; that is, the interlocking discs can also function as open / closed indicators. Furthermore, as mentioned above, the protrusion 44 on interlocking disc 2 (3801) cooperates with the stop bar 4201 on the interlocking plate. Therefore, interlocking disc 1 (3701) does not need to have a protrusion 44. However, for ease of processing and installation, the two interlocking discs can be processed to be identical, as the protrusion 44 is relatively small, minimizing material waste. Both can share a single mold for production, and there is no need to distinguish them during installation and subsequent maintenance and replacement, greatly improving convenience. Baffle 1 (3702) and baffle 2 (3802) also preferably adopt the same size and shape.

[0091] In this embodiment, as Figure 15 As shown, the phase selection switch operating mechanism 7 also includes a circuit breaker drive shaft 27 disposed on the operating panel 31. A circuit breaker open / close indicator 40 is mounted on the circuit breaker drive shaft 27. The circuit breaker drive shaft 27 and the circuit breaker main shaft 24 of the circuit breaker switch are connected via a connecting rod assembly 29. The connecting rod assembly 29 and the frame 1 of the circuit breaker switch are connected via an elastic element. Figure 13 As shown, multiple crank blocks 25 are provided on the outside of the circuit-breaking main shaft 24 to cooperate with the corresponding insulating tie rods 301. The crank blocks 25 cooperate with the pins 26 mentioned above.

[0092] Specifically, as shown in Figure 14 , the connecting rod assembly 29 includes an upper link arm 2901, a lower link arm 2903, and a connecting rod 2902, wherein the upper link arm 2901 is fixedly installed at the end of the circuit breaking main shaft 24, the lower link arm 2903 is fixedly installed at the inner end of the circuit breaking transmission shaft 27, and the two ends of the connecting rod 2902 are respectively hingedly connected with the upper link arm 2901 and the lower link arm 2903, wherein the connecting rod 2902 has the longest length, the upper link arm 2901 has the second longest length, and the lower link arm 2903 has the shortest length.

[0093] It can be understood that, in the initial state, as shown in Figure 14 , the lower link arm 2903 is horizontally right, and the upper link arm 2901 is located at the left lower inclination of the circuit breaking main shaft 24. When emergency opening is performed, the cover 30 on the circuit breaking transmission shaft 27 is first opened, so that the emergency opening port 43 on the operation panel 31 is exposed, then the operation handle is inserted to rotate the circuit breaking transmission shaft 27 counterclockwise, the lower link arm 2903 acts on the connecting rod 2902 to move upward, and the connecting rod 2902 can push the upper link arm 2901 to rotate clockwise, as shown, the circuit breaking main shaft 24 can rotate clockwise under the action of the upper link arm 2901, thereby driving the link block 25 to press the pin 26, so that the insulation pull rod 301 is forced to move in the opening direction, that is, it can overcome the magnetic attraction of the permanent magnet mechanism 4, so that the moving iron core 402 is forced to separate from the static iron core 404, and then under the action of the opening spring 13 in the circuit breaker, the moving and static contacts can be opened.

[0094] It should be noted that the emergency opening mechanism is similar to a force-saving lever, that is, through the transmission of the connecting rod 2902, the input torque (the lower link arm 2903) can generate a larger effective torque at the output end (the upper link arm 2901), thereby generating a larger rotating torque on the circuit breaking main shaft 24; in fact, the circuit breaking transmission shaft 27 needs to rotate more angles to drive a smaller rotation of the circuit breaking main shaft 24, that is, the speed / displacement is sacrificed to exchange for force amplification. It should be understood that the permanent magnet mechanism 4 needs to overcome the elastic force of the opening spring 13 when closing, and at this time the driving of the circuit breaking main shaft 24 can force the moving iron core 402 of the permanent magnet mechanism 4 to separate, thereby breaking the closed state, and then under the action of the opening spring 13, the circuit breaker can be quickly and urgently opened.

[0095] Further, as shown in Figure 14 , an elastic member (for example, a reset tension spring 28) can be installed between the connecting rod 2902 and the frame 1, and the function of the elastic member is to ensure that the link block 25 is in abutting cooperation with the pin 26 under the action of the elastic force, so that when the circuit breaker switch is normally opened and closed, the circuit breaker opening and closing indicator 40 can be rotated with the circuit breaking transmission shaft 27 through the transmission of the connecting rod assembly 29, thereby accurately displaying the state of the circuit breaker.

[0096] In this embodiment, as shown in Figure 15 and Figure 18 , a counter 39 and an electromagnetic lock 34 are also installed on the operation panel 31, the counter 39 can cooperate with the breaker opening and closing indication 40 to record the opening and closing times of the breaker switch, which is convenient for subsequent maintenance and maintenance. The electromagnetic lock 34 cooperates with the grounding operation shaft 46 (or the grounding operation port 33), and specifically, as shown in Figure 4 , an electric sensor is installed in the insulator 9 connected with the copper bar 8, and the electromagnetic lock 34 is electrically connected with the electric sensor; when the electric sensor detects that there is voltage inside, the lock tongue of the electromagnetic lock 34 will block the grounding operation port 33, at this time, pressing the unlocking button on the electromagnetic lock 34 does not work. When the electric sensor does not detect voltage, pressing the unlocking button on the electromagnetic lock 34 can make the lock tongue of the electromagnetic lock 34 retract, so that the operation handle can be inserted into the grounding operation port 33 for operation. Such design further improves the safety, avoids the risk of misoperation of the grounding switch 6 in the live state; in addition, the electromagnetic lock 34 cooperates with the above-mentioned mechanical interlocking device, which can greatly improve the interlocking reliability of the entire switch device.

[0097] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A combined phase selection switch, having multiple phases, characterized in that, Each phase includes: Vacuum interrupter; the vacuum interrupter is equipped with a permanent magnet mechanism, which is adapted to independently control the vacuum interrupter to perform opening and closing actions. Disconnecting switch, the disconnecting switch cooperating with the first end of the vacuum interrupter; and A grounding switch, which is coupled to the second end of the vacuum interrupter; It also includes an operating mechanism adapted to perform opening and closing operations on the disconnecting switch and the grounding switch; The vacuum interrupter is horizontally installed on the frame and arranged in an array via through-wall solid-sealed poles. The permanent magnet mechanism is installed on the frame and located above the corresponding vacuum interrupter. The drive end of the permanent magnet mechanism is connected to the moving contact of the vacuum interrupter via a transmission assembly. The permanent magnet mechanism is adapted to independently control the transmission assembly to open and close the vacuum interrupter. The operating mechanism includes an operating panel, an isolating operating shaft, a grounding operating shaft, an interlocking component one, and an interlocking component two. The isolating operating shaft and the grounding operating shaft are both mounted on the operating panel. The first interlocking component and the second interlocking component are mounted on the isolating operating shaft. The first interlocking component and the second interlocking component cooperate with each other through a limiting structure. When the isolating switch is closed, the first interlocking component is adapted to block the grounding operating shaft, and the second interlocking component is adapted to lock under the action of the limiting structure, so that the grounding operating shaft is in a locked and inoperable state. When the grounding switch is closed, the second interlocking component is adapted to block the isolating operating shaft, and the first interlocking component is adapted to lock under the action of the limiting structure, so that the isolating operating shaft is in a locked and inoperable state. The first interlocking component includes an interlocking disc and a baffle. The interlocking disc is sleeved and installed on the isolating operating shaft, and the baffle is installed on the interlocking disc. The second interlocking component includes an interlocking disc and a baffle. The interlocking disc is sleeved and installed on the grounding operating shaft, and the baffle is installed on the interlocking disc. The first interlocking disc and the second interlocking disc cooperate through the limiting structure. When the isolating switch is closed, the isolating operating shaft is adapted to drive the baffle to rotate through the first interlocking disc until it blocks the grounding operating shaft. At this time, the first interlocking disc is adapted to lock the second interlocking disc through the limiting structure. When the grounding switch is closed, the grounding operating shaft is adapted to drive the baffle to rotate through the second interlocking disc until it blocks the isolating operating shaft. At this time, the second interlocking disc is adapted to lock the first interlocking disc through the limiting structure.

2. The combined phase selection switch as described in claim 1, characterized in that: The transmission assembly includes an insulating pull rod and a transmission crank arm. The transmission crank arm is rotatably mounted on a bracket at the end of the vacuum interrupter chamber via a central section. The first end of the insulating pull rod is connected to the drive end of the permanent magnet mechanism, the second end of the insulating pull rod is connected to the top end of the transmission crank arm, and the bottom end of the transmission crank arm is connected to the moving contact. During the opening / closing process of the vacuum interrupter, the axis of the insulating pull rod coincides with the axis of the drive end of the permanent magnet mechanism at least once momentarily.

3. The combined phase selection switch as described in claim 2, characterized in that: When closing the circuit, the permanent magnet mechanism is adapted to drive the moving contact to move via the insulating pull rod and the transmission crank arm, and the insulating pull rod is adapted to rotate in a direction away from the driving end of the permanent magnet mechanism; when in the closed state, the axis of the insulating pull rod coincides with the axis of the driving end of the permanent magnet mechanism.

4. The combined phase selection switch as described in claim 2 or 3, characterized in that: Both the permanent magnet mechanism and the insulating pull rod are inclined so that the connection point between the insulating pull rod and the transmission crank arm is close to the rotation center of the transmission crank arm.

5. The combined phase selection switch as described in claim 1, characterized in that: The limiting structure includes a notch one located outside the interlocking disc one and a notch two located outside the interlocking disc two; When the disconnecting switch is in the closed state, the first interlocking disc cooperates with the second notch to lock the grounding operating shaft in the circumferential direction; when the grounding switch is in the closed state, the second interlocking disc cooperates with the first notch to lock the disconnecting operating shaft in the circumferential direction.

6. The combined phase selection switch as described in claim 5, characterized in that: The operation panel is provided with a circuit breaker opening / closing indicator and an interlocking plate 1, which is slidably disposed on the operation panel. When the circuit breaker switch is closed, the circuit breaker open / close indicator is adapted to abut against one end of the interlocking plate and lock the interlocking plate, so that the other end of the interlocking plate blocks the isolating operating shaft.

7. The combined phase selection switch as described in claim 6, characterized in that: The operation panel is slidably provided with an interlocking plate two, and the end of the interlocking plate two is equipped with a locking pin for the switch room door panel. The interlocking plate two cooperates with the interlocking disc two. When the grounding switch is open, the second interlocking disc is adapted to lock the second interlocking plate, at which time the switch room door is locked under the action of the locking pin; when the grounding switch is closed, the second interlocking disc is adapted to release the locking of the second interlocking plate, at which time the second interlocking plate is adapted to drive the locking pin to move and release the locking of the switch room door.

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