An uninterrupted one-key type secondary current switching switch

Abstract

The application relates to the technical field of current loop switching, in particular to a no-power one-key type secondary current switching switch; a box body for mounting a switch structure is provided with a plurality of wiring terminals on both sides, a plurality of M-side dynamic connecting plates and a plurality of N-side dynamic connecting plates are installed on the upper and lower sides in the box body through a plurality of M-side pressure springs and a plurality of N-side pressure springs, and a plurality of M-side static contacts and a plurality of N-side static contacts which are in communication with the wiring terminals are arranged on the upper and lower sides in the box body; a plurality of movable operating rods are installed in the box body, outgoing line dynamic connecting plates are arranged on the operating rods, the up-and-down movement of the operating rods can make the outgoing line dynamic connecting plates contact the corresponding M-side static contacts or N-side static contacts, and the outgoing line dynamic connecting plates are connected with the wiring terminal lines. The device is suitable for the secondary current loop of a power plant or a transformer substation. When used, the device is installed in series in the original current loop, and an operator only needs to pull down or push up to realize the current switching function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of current loop switching, in particular to a no-power one-key type secondary current switching switch. BACKGROUND

[0002] Relay protection is an important measure for sending an alarm signal or directly isolating and cutting off the fault part when detecting the fault or abnormal condition in the power system.

[0003] For the relay protection of a substation, the core part of the secondary circuit, the current loop, is responsible for the primary collection task of the relay protection, that is, it should be able to make correct logical judgments and action outputs. In practice, events of misoperation or refusal of the relay protection device caused by errors or damages of the current loop occur from time to time. When the current loop is open in operation, a very large voltage will be generated at the disconnection point. In many cases, the open circuit of the current loop is caused by human factors. At this time, if someone is working at the disconnection point, it is easy to cause personal injury accidents. In addition, the open circuit of the current loop will also cause the power of the current transformer to increase, and long-term open circuit may cause damage to related equipment.

[0004] In actual operation of a substation, it is often necessary to switch the operation mode of the current loop, such as: switching application one, during the test process of primary equipment, the secondary side current of the current transformer needs to be short-circuited from the terminal box to prevent the test current from being mistakenly added to the secondary circuit, causing misoperation of the relay protection device or personal injury; switching application two: in some substation main transformer bridge connection modes, if the incoming line of a transformer needs to be switched to a tie line operation, the secondary current loop needs to be switched from the secondary side of the incoming line current transformer to the secondary side of the tie line current transformer. This operation must shut down the transformer, and then the corresponding terminal patch is manually disassembled and installed to adjust the wiring to achieve the switching; switching application three: in a substation with a bypass bus, sometimes the bypass bus is needed to supply power to the line of the power-off interval. At this time, the secondary current loop of the original line current transformer needs to be switched to the secondary current loop of the bypass interval current transformer to realize the collection function of the line current of the relay protection and other related automatic devices. This process also needs to manually disassemble and install the corresponding terminal patch, that is, adjust the wiring to achieve the switching.

[0005] The traditional current switching is realized by manually adjusting the terminal patch. The method steps are as follows:

[0006] 1. Use a 4-connected terminal patch to connect the 4 terminals MA, MB, MC and MN on the M side.

[0007] 2. disconnect the MA and OA tab or shorting wire, disconnect the MB and OB tab or shorting wire, disconnect the MC and OC tab or shorting wire, disconnect the MN and ON tab or shorting wire;

[0008] 3. connect the OA and NA terminal with the 2-connected tab or shorting wire; connect the OB and NB terminal with the 2-connected tab or shorting wire; connect the OC and NC terminal with the 2-connected tab or shorting wire; connect the ON and NN terminal with the 2-connected tab or shorting wire;

[0009] 4. disconnect the 4-connected terminal tab connecting the NA, NB, NC and NN terminals.

[0010] The above process needs manual operation throughout, and in order to ensure personal safety, the primary equipment (current transformer) on the M side and the N side needs to be powered off during the entire process, so that the current switching work can be completed. At the same time, errors caused by human operation, such as tab connection errors or screws not tightened, can cause incorrect current in the secondary current loop after the primary equipment is powered on, which can cause the protection device to malfunction, or even open the current loop and cause injury. SUMMARY

[0011] The application provides a no-power one-key type secondary current switching switch, which effectively solves the problems of current loop open circuit and current loop operation mode switching in a substation. The secondary current switching switch is expected to be suitable for secondary current loops in power plants or substations. When used, it is installed in series in the original current loop. When the operation mode of the current loop in the substation needs to be switched, the operator only needs to pull down or push up to realize the function of current switching.

[0012] To achieve the above object, the technical scheme adopted by the application is as follows:

[0013] A no-power one-key type secondary current switching switch, comprising a box body 1 for installing a switch structure, a plurality of wiring terminals 2 are arranged on both sides of the box body 1, a plurality of M-side dynamic tabs 4 and a plurality of N-side dynamic tabs 11 are installed in the box body 1 through a plurality of M-side pressure springs 3 and a plurality of N-side pressure springs 10 on the upper and lower sides respectively, and a plurality of M-side static contacts 5 and a plurality of N-side static contacts 15 are arranged on the upper and lower sides of the box body 1 and communicated with the wiring terminals 2; a plurality of movable operating rods 16 are installed in the box body 1, an outgoing line dynamic tab 9 is arranged on the operating rod 16, the upward and downward movement of the operating rod 16 can make the outgoing line dynamic tab 9 contact the corresponding M-side static contact 5 or N-side static contact 15, and the outgoing line dynamic tab 9 is connected with the wiring terminal 2 in a line.

[0014] The terminal 2 is arranged on one side of the box and communicates with the M-side static contact 5, and includes MA, MB, MC and MN, and communicates with the outgoing dynamic connecting piece 9, and includes OA, OB, OC and ON; and is arranged on the other side of the box and communicates with the N-side static contact 15, and includes NA, NB, NC and NN.

[0015] The M-side dynamic connecting piece 4 and the N-side dynamic connecting piece 11 are respectively provided with the M-side locking rod 6 and the N-side locking rod 14 on both sides; the M-side locking pin 7 and the N-side locking pin 13 are respectively arranged in the sidewall of the box through the M-side locking pin spring 8 and the N-side locking pin spring 12, the engagement of the M-side locking rod 6 and the M-side locking pin 7 limits the moving distance of the M-side dynamic connecting piece 4, and the engagement of the N-side locking rod 14 and the N-side locking pin 13 limits the moving distance of the N-side dynamic connecting piece 11.

[0016] The moving distance of the M-side dynamic connecting piece 4 and the moving distance of the N-side dynamic connecting piece 11 are less than the reset length of the M-side pressure spring 3 and the N-side pressure spring 10.

[0017] The plurality of M-side static contacts 5 and the plurality of N-side static contacts 15 are arranged in one-to-one correspondence from top to bottom.

[0018] The plurality of M-side static contacts 5 and the plurality of N-side static contacts 15 are arranged on the box 1 corresponding to the track position, and the movable operating rod 16 is arranged through bolts, and the operating rod 16 includes the operating connecting rod 16-1 and the operating handle 16-2 arranged on the operating connecting rod 16-1.

[0019] The operating connecting rod 16-1 is provided with the outgoing dynamic connecting piece 9, and the outgoing dynamic connecting piece 9 includes the outgoing dynamic connecting piece metal part 9-1 and the outgoing dynamic connecting piece insulating part 9-2 arranged at both ends of the outgoing dynamic connecting piece metal part 9-1.

[0020] The outgoing dynamic connecting piece 9 side surface can be in contact with the corresponding M-side static contact 5 and N-side static contact 15 during the up and down movement.

[0021] The beneficial effects of the present application are: 1) the current switching mode of the existing manual adjustment terminal connecting piece can realize the function of current switching without power failure of the primary equipment.

[0022] 2) the switch is simple to operate, can reduce human error in the operation process, and can reduce serious personal injury or equipment damage accidents.

[0023] 3) the locking device of the switch can prevent the open circuit problem of the current loop caused by the wear or damage of the mechanical structure of the switch itself, and enhances the safety of the secondary current loop in the transformer substation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the main view of the utility structure.

[0025] Figure 2 This is a top view of the practical structure;

[0026] Figure 3 This is a bottom view of the structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the control lever structure;

[0028] Figure 5 This is a schematic diagram of the main structure of the control lever;

[0029] Figure 6 This is a schematic diagram of the terminal wiring principle;

[0030] Figure 7-1 , 7-2 7-3, 7-4, 7-5, 7-6, 7-7, and 7-8 are diagrams showing different switch states;

[0031] Figure 8-1 , 8-2 8-3, 8-4, 8-5, 8-6, 8-7, and 8-8 are electrical schematic diagrams for different states;

[0032] The following components are shown in the diagram: 1. Housing; 2. Terminal block; 3. M-side pressure spring; 4. M-side moving connecting piece; 5. M-side stationary contact; 6. M-side locking rod; 7. M-side locking pin; 8. M-side locking pin spring; 9. Outgoing moving connecting piece; 9-1. Outgoing moving connecting piece metal component; 9-2. Outgoing moving connecting piece insulating component; 10. N-side pressure spring; 11. N-side moving connecting piece; 12. N-side locking pin spring; 13. N-side locking pin; 14. N-side locking rod; 15. N-side stationary contact; 16. Operating lever; 16-1. Operating linkage; 16-2. Operating handle. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0034] Example 1

[0035] like Figure 1 -8 shows a non-stop one-button secondary current transfer switch. The entire switch is mounted on a housing 1. An M-side mounting unit and an N-side mounting unit are provided at the upper and lower ends of the housing 1. A movable operating device is installed between the M-side mounting unit and the N-side mounting unit. The specific structure is as follows.

[0036] The enclosure 1 has terminals 2 at both the top and bottom. The top surface has 8 terminals: MA, MB, MC, MN, OA, OB, OC, and ON. The top surface also has 4 terminals: NA, NB, NC, and NN.

[0037] The M-side mounting unit comprises: M-side pressure springs 3, M-side dynamic links 4, M-side static contacts 5, M-side locking rods 6, M-side locking pins 7, and M-side locking pin springs 8.

[0038] The M-side pressure springs 3 are installed on the upper wall of the box body 1, and a plurality of M-side pressure springs 3 are arranged. The M-side dynamic links 4 are installed through the M-side pressure springs 3. The M-side dynamic links 4 can be driven to move up and down through compression or reset of the M-side pressure springs 3.

[0039] The M-side static contacts 5 are installed on the middle upper part of the inner wall of the box body 1, and the M-side static contacts 5 are conductive contacts. The M-side static contacts 5 are provided in four groups, and the four groups of M-side static contacts 5 are respectively connected with MA, MB, MC, and MN lines.

[0040] During the recovery process of the M-side pressure springs 3 after being pressed, the M-side static contacts 5 can be in contact with the M-side dynamic links 4 to be connected.

[0041] The moving distance of the M-side dynamic links 4 is realized through cooperation of the M-side locking rods 6, the M-side locking pins 7, and the M-side locking pin springs 8. The M-side locking pins 7 are fixedly installed on the M-side locking pin springs 8 at the central position of the inner wall of the box body 1, and can be driven to move left and right under the action of an external force. The M-side locking rods 6 are installed on both ends of the M-side dynamic links 4. During the downward movement of the M-side dynamic links 4, the M-side locking rods 6 are in mesh with the bottom ends of the M-side locking pins 7 in a natural state. Since the bottom end of the M-side locking pin 7 is in a conical structure, the M-side locking pin 7 can be pressed. The M-side locking pin spring 8 is compressed, thereby blocking the movement of the M-side dynamic link 4.

[0042] The N-side mounting unit comprises: N-side pressure springs 10, N-side dynamic links 11, N-side locking pin springs 12, N-side locking pins 13, N-side locking rods 14, and N-side static contacts 15.

[0043] The N-side pressure springs 10 are installed on the lower wall of the box body 1, and a plurality of N-side pressure springs 10 are arranged. The N-side dynamic links 11 are installed through the N-side pressure springs 10. The N-side dynamic links 11 can be driven to move up and down through compression or reset of the N-side pressure springs 10.

[0044] The N-side static contacts 15 are installed on the middle lower part of the inner wall of the box body 1, and the N-side static contacts 15 are conductive contacts. The N-side static contacts 15 are provided in four groups, and the four groups of N-side static contacts 15 are respectively connected with NA, NB, NC, and NN lines.

[0045] During the recovery process of the N-side pressure springs 10 after being pressed, the N-side static contacts 15 can be in contact with the N-side dynamic links 11 to be connected.

[0046] The moving distance of the N-side moving link 11 is realized by the cooperation of the N-side locking rod 14, the N-side locking pin 13 and the N-side locking pin spring 12. The N-side locking pin 13 is fixedly installed by the N-side locking pin spring 12 at the central position of the inner wall of the box body 1 and can be driven to move left and right under the action of external force. The N-side locking rod 14 is installed at both ends of the N-side moving link 11. During the upward movement of the N-side moving link 11, the N-side locking rod 14 is engaged with the bottom end of the N-side locking pin 13 in a natural state. Since the bottom end of the N-side locking pin 13 is in a conical structure, the N-side locking pin 13 can be extruded, so that the N-side locking pin spring 12 is compressed, thereby blocking the movement of the N-side moving link 11.

[0047] The M-side mounting unit and the N-side mounting unit are arranged symmetrically and correspond to each other at the upper and lower ends.

[0048] The operating device includes the outgoing line moving link 9 and the operating rod 16.

[0049] On the box body 1 at the corresponding track positions of the M-side static contact 5 and the N-side static contact 15, the movable operating rod 16 is installed by bolts, and the operating rod 16 includes an operating link 16-1 and an operating handle 16-2 arranged on the operating link 16-1.

[0050] The outgoing line moving link 9 is installed on the operating link 16-1, and the outgoing line moving link 9 includes an outgoing line moving link metal part 9-1 and outgoing line moving link insulating parts 9-2 at both ends of the outgoing line moving link metal part 9-1. The outgoing line moving link metal part 9-1 is connected to the OA, OB, OC and ON ports of the terminal 2 by wires.

[0051] The specific operation steps are shown in Figure 7-1 、 7-2 , 7-3, 7-4, 7-5, 7-6, 7-7, 7-8:

[0052] Figure 7-1 The sliding step a of the outgoing line moving link 9 is shown

[0053] When the outgoing line moving link 9 slides to the uppermost position, the outgoing line moving link insulating part 9-2 on the upper side of the outgoing line moving link 9 pushes the M-side moving link 4 upward, causing the M-side pressure spring 3 to be compressed, while the M-side locking rod 6 moves upward together with the M-side moving link 4, and the M-side locking pins 7 on the left and right sides are reset under the push of the M-side locking pin spring 8. At this time, the N-side moving link 11 is tightly attached to the N-side static contact 15 upward under the pressure of the N-side pressure spring 10, and the N-side locking rod 14 connected to the N-side moving link 11 respectively clamps the N-side locking pins 13 on the left and right sides upward, and the N-side locking pin spring 12 is compressed by the N-side locking pin 13. The electrical connection relationship in this state is that the outgoing line moving link metal part 9-1 is tightly attached to the M-side static contact 5, the M-side moving link 4 is separated from the M-side static contact 5, and the N-side moving link 11 is tightly attached to the N-side static contact 15. That is, the wiring terminal MA is connected to OA, the wiring terminal MB is connected to OB, the wiring terminal MC is connected to OC, the wiring terminal MN is connected to ON, and the wiring terminal NA is connected to NB, NC, and NN, as shown in FIG. 6. Figure 8-1

[0054] Figure 7-2 The sliding step b of the outgoing line moving link 9 is shown in FIG. 5.

[0055] When the outgoing line moving link 9 slides downward, the pressure of the M-side pressure spring 3 is partially released, and the M-side moving link 4 moves downward together with the outgoing line moving link 9 under the pressure of the M-side pressure spring 3. The M-side locking rod 6 moves downward together with the outgoing line moving link 9, and when the M-side locking rod 6 touches the M-side locking pin 7, the state of the M-side locking pin 7, the M-side locking pin spring 8, the N-side pressure spring 10, the N-side moving link 11, the N-side locking pin spring 12, the N-side locking pin 13, and the N-side locking rod 14 does not change. The electrical connection relationship in this state does not change, as shown in FIG. 7. Figure 8-2

[0056] Figure 7-3 The sliding step c of the outgoing line moving link 9 is shown in FIG. 6.

[0057] ​​When the outgoing line moving link 9 continues to slide downward, the M-side pressure spring 3 is completely released, the M-side moving link 4 moves downward under the pressure of the M-side pressure spring 3 at the same time as the outgoing line moving link 9, the M-side locking rod 6 moves downward with the outgoing line moving link 9, the M-side moving link 4 moves downward under the pressure of the M-side pressure spring 3 to be in close contact with the M-side static contact 5, and the M-side locking rod 6 pushes the M-side locking pins 7 on both sides to move to both sides, and the M-side locking pin spring 8 is compressed. The path for the outgoing line moving link 9 to continue to move downward is opened, and the state of the N-side pressure spring 10, the N-side moving link 11, the N-side locking pin spring 12, the N-side locking pin 13, and the N-side locking rod 14 does not change. The electrical connection relationship in this state is that the outgoing line moving link metal part 9-1 is in close contact with the M-side static contact 5, the M-side moving link 4 is in close contact with the M-side static contact 5, and the N-side moving link 11 is in close contact with the N-side static contact 15. That is, the connection terminals MA, OA, MB, OB, MC, OC, MN, and ON are connected, and NA, NB, NC, and NN are connected, as shown in FIG. 7-3. Figure 8-3

[0058] 7-4 shows the sliding step d of the outgoing line moving link 9

[0059] When the outgoing line moving link 9 continues to slide downward, the outgoing line moving link metal part 9-1 is separated from the M-side static contact 5, and the state of the M-side pressure spring 3, the M-side moving link 4, the M-side locking rod 6, the M-side locking pin 7, the M-side locking pin spring 8, the N-side pressure spring 10, the N-side moving link 11, the N-side locking pin spring 12, the N-side locking pin 13, and the N-side locking rod 14 does not change. The electrical connection relationship in this state is that the outgoing line moving link metal part 9-1 is separated from the M-side static contact 5, the M-side moving link 4 is in close contact with the M-side static contact 5, and the N-side moving link 11 is in close contact with the N-side static contact 15. That is, the connection terminals MA are connected to MB, MC, MN, NA, NB, NC, and NN, and OA, OB, OC, and ON are suspended, as shown in FIG. 7-4. Figure 8-4

[0060] Figure 7-5 7-4 shows the sliding step d of the outgoing line moving link 9

[0061] When the outgoing line moving link 9 continues to slide downward, the outgoing line moving link metal part 9-1 is separated from the M-side static contact 5, and the state of the M-side pressure spring 3, the M-side moving link 4, the M-side locking rod 6, the M-side locking pin 7, the M-side locking pin spring 8, the N-side pressure spring 10, the N-side moving link 11, the N-side locking pin spring 12, the N-side locking pin 13, and the N-side locking rod 14 does not change. The electrical connection relationship in this state is that the outgoing line moving link metal part 9-1 is separated from the M-side static contact 5, the M-side moving link 4 is in close contact with the M-side static contact 5, and the N-side moving link 11 is in close contact with the N-side static contact 15. That is, the connection terminals MA are connected to MB, MC, MN, NA, NB, NC, and NN, and OA, OB, OC, and ON are suspended, as shown in FIG. 7-4. Figure 8-5

[0062] Figure 7-6 7-4 shows the sliding step d of the outgoing line moving link 9 ​​​

[0063] When the wire-out moving link 9 continues to slide down again, the lower wire-out moving link insulating part 9-2 touches the N-side moving link 11, and the M-side pressure spring 3, the M-side moving link 4, the M-side locking rod 6, the M-side locking pin 7, the M-side locking pin spring 8, the N-side pressure spring 10, the N-side moving link 11, the N-side locking pin spring 12, the N-side locking pin 13, the N-side locking rod 14 do not change in state. The electrical connection relationship in this state is that the M-side moving link 4 is in close contact with the M-side static contact 5, the wire-out moving link metal part 9-1 is in close contact with the N-side static contact 15, and the N-side moving link 11 is in close contact with the N-side static contact 15, that is, the connection of the terminal MA connects MB connects MC connects MN, NA connects OA, NB connects OB, NC connects OC, and NN connects ON, as shown in Figure 8-6 .

[0064] Figure 7-7 The sliding step of the wire-out moving link 9 is shown in g

[0065] When the wire-out moving link 9 continues to slide down again, the N-side moving link 11 moves down under the push of the wire-out moving link 9, and the N-side pressure spring 10 is partially compressed. The N-side locking rod 14 connected with the N-side moving link 11 moves down at the same time, and the N-side locking pins 13 on the left and right sides move to the middle under the pressure of the N-side locking pin spring 12, blocking the channel for the upward movement of the wire-out moving link 9. At this time, the M-side pressure spring 3, the M-side moving link 4, the M-side locking rod 6, the M-side locking pin 7, and the M-side locking pin spring 8 do not change in state. The electrical connection relationship in this state is that the M-side moving link 4 is in close contact with the M-side static contact 5, the wire-out moving link metal part 9-1 is in close contact with the N-side static contact 15, and the N-side moving link 11 is separated from the N-side static contact 15, that is, the connection of the terminal MA connects MB connects MC connects MN, OA connects NA, OB connects NB, OC connects NC, and ON connects NN, as shown in Figure 8-7 .

[0066] Figure 7-8 The sliding step of the wire-out moving link 9 is shown in h

[0067] When the wire-out moving link 9 slides down to the bottom, the N-side moving link 11 moves down under the push of the wire-out moving link 9, and the N-side pressure spring 10 is completely compressed. At this time, the M-side pressure spring 3, the M-side moving link 4, the M-side locking rod 6, the M-side locking pin 7, the M-side locking pin spring 8, the N-side locking pin spring 12, and the N-side locking pin 13 do not change in state. The electrical connection relationship in this state does not change, as shown in Figure 8-8 .

[0068] The operation method and working principle of the secondary current switching switch in use:

[0069] The secondary current switch is expected to be suitable for secondary current circuit of power plant or transformer substation. When used, it is installed in series in the original current circuit. When it is needed to switch the operation mode of the transformer substation current circuit, the operator only needs to pull or push the operating handle 16-2 of the operating rod 16 from top to bottom, so as to realize the current switching function: taking the case of pulling from top to bottom as an example, the initial state of the position relationship of each component is shown in Figure 7-1 The process experienced by the device is as follows: the operating handle 16-2 of the operating rod 16 drives the outgoing line moving link to move downward, the M-side moving link moves downward along with the outgoing line moving link under the driving of the M-side pressure spring, until it is in close contact with the M-side static contact, at the same time, the M-side locking rod moves downward along with the M-side moving link, the lower inclined surface of the M-side locking rod extrudes the upper inclined surface of the M-side locking pin, causing the left M-side locking pin to move leftward and the right M-side locking pin to move rightward; the middle side of the M-side locking pin which moves to the determined position leaves space for the outgoing line moving link, the operating handle 16-2 of the operating rod 16 drives the outgoing line moving link to continue to move downward, the metal part of the outgoing line moving link is separated from the M-side static contact first, and then is in close contact with the N-side static contact; after the lower part of the outgoing line moving link is in close contact with the N-side moving link, the outgoing line moving link continues to move downward, drives the N-side moving link to move downward, causing the N-side moving link to be separated from the N-side static contact, at the same time, the N-side locking rod connected with the N-side moving link moves downward along with the N-side moving link, the inclined surface on the upper part of the N-side locking rod moves downward to leave space for the N-side locking pin, the N-side locking pin moves to the middle under the driving of the N-side locking pin spring, and blocks the space in the middle. For the operator, it is equivalent to realize "one-key" operation.

[0070] It is obvious for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0071] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A no-break one-key type secondary current switching switch, comprising a box body in which a switch structure is installed, and a plurality of wiring terminals are arranged on both sides of the box body, characterized in that: M side dynamic connecting piece and N side dynamic connecting piece are installed on the upper and lower sides of the box through M side pressure springs and N side pressure springs, and M side static contacts and N side static contacts are arranged on the upper and lower sides of the box and communicated with the wiring terminals; The wiring terminals are MA, MB, MC and MN which are communicated with the M side static contacts and OA, OB, OC and ON which are communicated with the outgoing dynamic connecting piece on one side of the box, and NA, NB, NC and NN which are communicated with the N side static contacts on the other side of the box; M side locking rods and N side locking rods are arranged on both sides of the M side dynamic connecting piece and the N side dynamic connecting piece, M side locking pins and N side locking pins are installed in the side wall of the box through M side locking pin springs and N side locking pin springs, the engagement of the M side locking rods and the M side locking pins limits the moving distance of the M side dynamic connecting piece, and the engagement of the N side locking rods and the N side locking pins limits the moving distance of the N side dynamic connecting piece; The moving distance of the M side dynamic connecting piece and the moving distance of the N side dynamic connecting piece are less than the reset length of the M side pressure spring and the N side pressure spring; An outgoing dynamic connecting piece is arranged on the operation connecting rod, and the outgoing dynamic connecting piece includes an outgoing dynamic connecting piece metal part and an outgoing dynamic connecting piece insulating part at both ends of the outgoing dynamic connecting piece metal part. The outgoing dynamic connecting piece side surface can contact the corresponding M side static contacts and N side static contacts during the up and down movement.

2. The no-break one-key secondary current transfer switch according to claim 1, characterized in that: The M side static contacts and the N side static contacts are arranged one by one in the corresponding track positions of the box.

3. The no-break one-key secondary current transfer switch according to claim 1, characterized in that: Movable operation rods are installed on the box through bolts in the corresponding track positions of the M side static contacts and the N side static contacts, and the operation rods include operation connecting rods and operation handles arranged on the operation connecting rods.

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