Double-fracture three-position switch beneficial to grounding closing and ring main unit

Abstract

The invention relates to a double-fracture three-position switch beneficial to grounding closing and a ring main unit, and relates to the technical field of ring main units, the switch comprises three control switches, and each control switch comprises a wire used for inputting current; the first static contact and the second static contact are provided with a first reversing part and a second reversing part respectively, and the first reversing part is connected with the wire; the three second commutation parts input the current into the ground through a grounding assembly. The moving contact is rotationally arranged on the cabinet body, so that the moving contact is connected with the first static contact and the second static contact in an inserted mode to achieve grounding, or the moving contact is separated from the first static contact and the second static contact to achieve opening; and the reversing part I and the reversing part II enable the current direction to turn. According to the invention, the direction of the current after being contacted and communicated with the moving contact is turned through the arrangement of the first reversing part and the second reversing part, so that the electric repulsive force to the moving contact before reversing is converted into the electric assisting force, grounding can be successfully and stably completed, and the risk of causing heavy production loss is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ring main units, in particular to a double-break three-position switch facilitating grounding and a ring main unit. BACKGROUND

[0002] The gas ring main unit comprises a three-position isolating switch and a three-phase circuit breaker, the vacuum arc-extinguishing chamber modules of the three-phase circuit breaker are connected with the same circuit breaker main shaft, the circuit breaker of the gas ring main unit is responsible for protecting the internal circuit, safe opening and closing and other functions, the driving mechanism of the gas ring main unit drives the circuit breaker main shaft to rotate back and forth, and then drives the vacuum arc-extinguishing chamber modules of the circuit breaker to realize the opening and closing of the circuit.

[0003] The high-voltage switch realizes the opening and grounding through the separation and contact of the moving contact and the two static contacts, the current flows after the moving contact rotates and contacts the two static contacts, the moving contact is pushed away from the two static contacts in the direction away from the two static contacts according to the direction of the current flow, so that the grounding process can only be partially completed and cannot be successfully grounded, and the speed in the grounding process is slow due to the existence of the electric repulsion, which leads to long-time discharge heating and easy ablation phenomenon such as melting of the moving contact and the two static contacts, thereby causing significant production loss. SUMMARY

[0004] In order to reduce the significant production loss, the application provides a double-break three-position switch facilitating grounding and a ring main unit.

[0005] In the first aspect, the application provides a double-break three-position switch facilitating grounding, which adopts the following technical scheme: A double-break three-position switch facilitating grounding, comprising three control switches, the control switch comprising: A wire arranged on the cabinet body and used for inputting current; A static contact one and a static contact two, each provided with a reversing part one and a reversing part two, the reversing part one being connected with the wire through a connecting assembly; the three reversing part twos being connected through a grounding assembly and used for inputting current to the ground; A moving contact rotatably arranged on the cabinet body, so that the moving contact is inserted with the static contact one and the static contact two to realize grounding, or the moving contact is separated from the static contact one and the static contact two to realize opening; the reversing part one and the reversing part two make the current direction turn 180 degrees and make the electric repulsion on both ends of the moving contact into electric assistance.

[0006] By adopting the technical scheme, the dynamic contact rotates to make the two ends close to and contact with the static contact one and the static contact two, the current in the wire enters the static contact one through the reversing part one, and then the current sequentially passes through the dynamic contact, the static contact two and the reversing part two, and finally the current is input into the ground through the grounding assembly, relative to the prior art, the current direction is reversed after being in contact with the dynamic contact by arranging the reversing part one and the reversing part two, that is, the current direction is turned by 180 degrees, so that the electric repulsion of the dynamic contact before reversing is converted into electric assistance, and after the dynamic contact rotates, the static contact one and the static contact two can quickly and conveniently complete plugging to realize grounding, the grounding can be successfully and stably completed, the time of the plugging process is saved, the occurrence of the ablation phenomenon is reduced, and the risk of causing significant production loss is reduced.

[0007] Optionally, a rotating piece is rotatably installed on the cabinet body, and the three dynamic contacts are arranged on the rotating piece.

[0008] By adopting the technical scheme, the three dynamic contacts are located on the rotating piece, and the state of the three switches is converted by rotating the rotating piece, so that the control process is more stable; the static contact one and the static contact two are plugged and installed in the plugging space and abut against the two isolation contact blades for positioning, so that the stability after electrical connection is higher, and the risk of causing significant production loss is further reduced.

[0009] Optionally, the two isolation contact blades are connected with the rotating piece through a fixing assembly. Two elastic pads are arranged on the opposite two side walls of the two isolation contact blades and have elasticity and are clamped and arranged on the rotating piece for positioning. A fixed screw rod penetrates through the two elastic pads and the rotating piece and is threadedly connected with a fixed nut abutting against the rotating piece for positioning.

[0010] By adopting the technical scheme, the two isolation contact blades are replaced, and the elastic pads have elasticity, when the static contact one and the static contact two are inserted into the plugging space, the two isolation contact blades are pushed away from each other, the elastic pads can buffer, so that the static contact one and the static contact two are conveniently inserted into the plugging space, the resistance during plugging is reduced, after plugging is completed, the elastic pads rebound to push the two isolation contact blades to abut against the static contact one and the static contact two for positioning, the stability during grounding is further improved, the plugging time is saved, the risk of ablation phenomenon is reduced, and the risk of causing significant production loss is further reduced.

[0011] Optionally, the static contact one and the static contact two are provided with protrusions on the two side walls opposite to the one end of the moving contact, the two protrusions press on the two isolation contact knives to realize electrical connection; the static contact two is provided with a limiting piece, and the moving contact is positioned by abutting against the limiting piece after rotation and realizes grounding.

[0012] By adopting the above technical scheme, the contact area with the two isolation contact knives can be reduced, thereby reducing the area of the isolation contact knife worn by friction and improving the stability after electrical connection. Meanwhile, the moving contact is positioned by abutting against the limiting piece after rotation, at this time, the moving contact and the static contact one and the static contact two have realized complete plugging, i.e., the plugging is in place, thereby the electrical connection can be quickly and stably completed, and the risk of causing significant production loss is reduced.

[0013] Optionally, the grounding assembly comprises: a connecting plate for connecting the three static contact twos with each other; a supporting plate provided on the connecting plate and used for grounding and guiding the current on the static contact twos into the ground in cooperation with the connecting plate.

[0014] By adopting the above technical scheme, the three static contact twos are connected and positioned by the connecting plate, and the supporting plate can support the connecting plate, so that the current on the three static contact twos is guided into the ground.

[0015] Optionally, the connecting assembly comprises a connecting block and a connecting screw, and the connecting screw is threadedly connected with the connecting block through the reversing part one.

[0016] By adopting the above technical scheme, the wire is fixedly connected and electrically connected with the reversing part one.

[0017] Optionally, the control switch further comprises: a supporting plate provided on the cabinet; a connecting contact provided on the supporting plate and electrically connected with the arc extinguishing chamber and arranged in a circumferential array around the moving contact rotation axis together with the static contact one and the static contact two; a positioning plate provided on the supporting plate; the moving contact is rotated away from the static contact two and close to the connecting contact, so that the two ends of the moving contact are plugged with the static contact one and the connecting contact to realize closing and abut against the positioning plate for positioning.

[0018] By adopting the above technical scheme, when the moving contact is not connected with the static contact one and the static contact two, the switch is in an open state, the moving contact is rotated away from the static contact one and the static contact two, so that the two ends of the moving contact are completely plugged with the static contact one and the connecting contact to realize electrical connection, and the moving contact abuts against the positioning plate for positioning, thereby the closing can be stably realized, and the risk of causing significant production loss is further reduced.

[0019] Optionally, the reversing part one is provided with a sliding channel for the sliding of the static contact one, and the sliding channel is located at both sides of the connecting assembly and is provided with a positioning member for positioning the static contact one under the action of the adsorption force; When grounding is needed, the static contact one is positioned on the end of the sliding channel close to the static contact two and is positioned by the positioning member and provides electric assistance to the moving contact; when closing is needed, the static contact one is positioned on the end of the sliding channel close to the connecting contact and is positioned by the positioning member and provides electric assistance to the moving contact when rotating.

[0020] By adopting the above technical scheme, when grounding, one end of the moving contact approaches the static contact one from one side and contacts the static contact one, and the electric current on the reversing part one generates electric assistance for the moving contact to approach the static contact one, but when closing, the other end of the moving contact approaches the static contact one from the other side and contacts the static contact one, at this time, the electric current on the reversing part one generates electric repulsion to the moving contact to move away from the static contact one, thereby making it difficult to close and taking a long time, and thus increasing the risk of causing significant production loss.

[0021] When grounding is needed, the reversing part one is positioned on the end of the sliding channel close to the static contact two, at this time, the moving contact approaches and contacts the static contact one to generate an electric current, and the static contact one generates electric assistance to the static contact one, which can complete grounding faster and more stably.

[0022] When closing is needed, first, opening is performed, that is, the moving contact rotates, and since the moving contact and the static contact one generate a force of action, the static contact one can overcome the adsorption force of the positioning member and separate from the positioning member, the static contact one moves on the sliding channel, so that the static contact one is positioned on the other end of the sliding channel and is positioned by the positioning member, the moving contact separates from the static contact one and the static contact two, thereby realizing opening, and also moving the static contact one from one end of the sliding channel to the other end, that is, from one side of the connecting assembly to the other side.

[0023] The one end of the moving contact rotates to approach the connecting contact, and the other end approaches the static contact one, so that the moving contact contacts the connecting contact and the static contact one to generate an electric current, at this time, compared with grounding, the static contact one has moved from one side of the connecting assembly to the other side, so that the electric current reverses and generates electric assistance to the moving contact to approach the static contact one, which can facilitate fast and stable closing, and the setting of the two positioning members makes the closing and grounding more stable, further reducing the risk of causing significant production loss.

[0024] When grounding is needed, the operation process is the same as when closing is needed, the moving contact drives the static contact one to separate from the positioning member and moves to the other end of the sliding channel and continues to be positioned by the other positioning member, thereby realizing fast and stable grounding and closing.

[0025] Meanwhile, when switching from closing to opening and then closing again, or when switching from grounding to opening and then grounding again, the moving contact rotates to contact the stationary contact, and at this time, the pushing contact generates an electric repulsion force, thereby pushing the stationary contact to move to the other side of the slide way and then being positioned by the positioning member, and then the current flows to form an electric assistance force, thereby further reducing the risk of causing significant production loss. The two modes have a small possibility.

[0026] Optionally, the positioning member is two magnets and two iron blocks, the two magnets are arranged on the two ends of the slide way, and the two iron blocks are arranged on the two opposite side walls of the stationary contact one. When the stationary contact one abuts on one end of the slide way, the magnets are adsorbed on the iron blocks to position the stationary contact one.

[0027] By adopting the above technical solution, when the stationary contact one abuts on the two ends of the slide way, the magnets are adsorbed on the iron blocks to position the stationary contact one. When the stationary contact one is separated, the magnets and the iron blocks are separated under the action of the pushing force, thereby achieving unlocking.

[0028] In a second aspect, the application provides a ring main unit, which adopts the following technical solution: The ring main unit comprises a cabinet body and a switch arranged on the cabinet body.

[0029] In summary, the application has the following at least one beneficial technical effect: 1. By arranging the reversing part one and the reversing part two, the current direction is reversed after contacting the moving contact, thereby converting the electric repulsion force on the moving contact before reversing into an electric assistance force, so that the moving contact can quickly and conveniently complete plugging with the stationary contact one and the stationary contact two after rotating to achieve grounding, successfully and stably complete grounding, save the plugging time, reduce the ablation phenomenon, and reduce the risk of causing significant production loss.

[0030] 2. By moving the stationary contact one, the state of the moving contact can be changed from grounding to opening and then to closing, or from closing to opening and then to grounding, thereby generating an electric assistance force on the moving contact, making the closing and grounding more stable, and further reducing the risk of causing significant production loss. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective structural schematic view of the switch embodiment 1; Figure 2 is a partial structural schematic view of the switch embodiment 1 in an opening state; Figure 3 is a structural schematic view of the moving contact and the fixed assembly in the switch embodiment 1; Figure 4is a partial structure schematic diagram of the switch embodiment 1 in the grounding state, and the arrow in the figure is the current direction; Figure 5 is a partial structure schematic diagram of the switch embodiment 1 in the closing state; Figure 6 is a partial structure schematic diagram of the switch embodiment 2.

[0032] Fig. 1 is a control switch; 11 is a wire; 12 is a static contact one; 13 is a static contact two; 14 is a supporting plate; 15 is a connecting contact; 16 is a positioning plate; 2 is a moving contact; 21 is an isolation contact; 22 is a plug-in space; 23 is a protruding part; 24 is a limiting part; 25 is a reversing part one; 26 is a reversing part two; 3 is a rotating part; 31 is a mounting hole; 32 is a mounting plate; 4 is a fixing assembly; 41 is an elastic pad; 42 is a fixing screw; 5 is a grounding assembly; 51 is a connecting plate; 52 is a supporting plate; 6 is a sliding way; 7 is a positioning part; 71 is a magnet; 72 is an iron block; 8 is a connecting assembly; 81 is a connecting block; 82 is a connecting screw. DETAILED DESCRIPTION

[0033] The present application is further described below.

[0034] The embodiment of the present application discloses a double-break three-position switch with favorable grounding closing.

[0035] Embodiment 1, refer to Figures 1-2 The double-break three-position switch with favorable grounding closing comprises three control switches 1, and the control switch 1 comprises a wire 11, a static contact one 12, a static contact two 13 and a moving contact 2. The wire 11 is fixedly installed on a cabinet body and is used for inputting current. The static contact one 12 and the static contact two 13 are respectively provided with a reversing part one 25 and a reversing part two 26. The reversing part one 25 is fixedly installed on one end of the wire 11 through a connecting assembly 8. The three reversing part two 26 are connected with the cabinet body through a grounding assembly 5.

[0036] The moving contact 2 is rotationally installed on the cabinet body through a rotating part 3, and the static contact one 12 and the static contact two 13 are circumferentially arranged around the axis of the rotating part 3. The moving contact 2 is rotated, so that the moving contact 2 is completely plugged with the static contact one 12 and the static contact two 13 to realize grounding. The complete plugging is that the moving contact 2 is plugged in place with the static contact one 12 and the static contact two 13 after rotation. Alternatively, the moving contact 2 is separated from the static contact one 12 and the static contact two 13 to realize opening. The reversing part one 25 and the reversing part two 26 make the current direction reverse, and the direction is 180 degrees. The direction of the force of the current on the moving contact 2 is transformed by 180 degrees, so that the electric repulsion force on both ends of the moving contact 2 is transformed into electric assistance force close to the static contact one 12 and the static contact two 13.

[0037] Refer to Figures 1-3The rotating part 3 is rotatably installed on the cabinet body and is in a horizontal state. The rotating part 3 is externally connected with a driving source, which can be a servo motor or the like. The three movable contacts 2 are arranged on the rotating part 3 along the axis of the rotating part 3. The three stationary contacts one 12 and the three stationary contacts two 13 are arranged along the axis of the rotating part 3. The stationary contacts one 12 and the stationary contacts two 13 are arranged in one-to-one correspondence with the rotating part 3. The rotating part 3 is provided with mounting holes 31 penetrating the rotating part 3. The mounting holes 31 are formed with mounting plates 32. The movable contacts 2 include two isolation contact blades 21 arranged along the axis of the rotating part 3. The two isolation contact blades 21 are respectively located on the two sides of the mounting plate 32.

[0038] The two isolation contact blades 21 are connected with the rotating part 3 through a fixing assembly 4. The length direction of the isolation contact blade 21 is perpendicular to the axis of the rotating part 3. The two isolation contact blades 21 penetrate the mounting holes 31 located on the two sides of the mounting plate 32. The fixing assembly 4 includes two elastic pads 41 and a fixing screw 42. The two elastic pads 41 are fixedly installed on the two sides of the two isolation contact blades 21 and have elasticity. The two elastic pads 41 are clamped and installed on the two clamping grooves along the axis direction of the rotating part 3 for positioning.

[0039] The two isolation contact blades 21 are provided with isolation holes. The rotating part 3 is provided with rotating holes. The fixing screw 42 is sequentially threaded through the rotating holes and the isolation holes and is screwed with the first elastic pad 41. The fixing screw 42 is threaded through the mounting plate 32 and is screwed with the second elastic pad 41 and is sequentially threaded through the isolation holes and the rotating holes. The fixing screw 42 is screwed with a fixing nut which is positioned on the rotating part 3.

[0040] The two isolation contact blades 21 are cooperatively formed with a plug-in space 22. The stationary contacts one 12 and the stationary contacts two 13 are integrally provided with protruding parts 23 on the two side walls opposite to each other and at the top end. The stationary contacts one 12 and the stationary contacts two 13 are respectively plug-in installed into the plug-in space 22 located at the two ends of the movable contacts 2. The two protruding parts 23 are positioned on the two side walls opposite to each other of the two isolation contact blades 21 by abutting thereagainst, so as to realize electrical connection.

[0041] Referring to Figures 1-4 The stationary contacts two 13 are fixedly installed with a limiting part 24 at the top. When the movable contacts 2 are rotated and the stationary contacts two 13 are plug-in installed into the plug-in space 22, the movable contacts 2 are positioned by abutting against the limiting part 24. At this time, the stationary contacts two 13 and the movable contacts 2 are completely plug-in connected and successful grounding is realized.

[0042] The connecting assembly 8 includes a connecting block 81 and a connecting screw 82. The connecting block 81 is fixedly mounted on the top of the wire 11 and abuts against the lower surface of the commutation part 25 away from the stationary contact 12 for positioning. The connecting screw 82 passes through the commutation part 25 and is threadedly connected to the connecting block 81. The head of the connecting screw 82 is located inside the connecting block 81, thereby realizing the electrical connection between the wire 11 and the commutation part 25.

[0043] The grounding assembly 5 includes a connecting plate 51 and a support plate 52. The connecting plate 51 is fixedly installed at the bottom of multiple stationary contacts 13 and is in a horizontal state. The top of the support plate 52 is fixedly installed on the connecting plate 51, and the bottom of the support plate 52 is connected to the cabinet, thereby realizing the conduction of current to the ground.

[0044] Reference Figure 1 , Figures 3-5 The control switch 1 also includes a support plate 14, a connecting contact 15, and a positioning plate 16. The support plate 14 is fixedly installed on the cabinet and electrically connected to the arc-extinguishing chamber. The support plate 14, the first stationary contact 12, and the second stationary contact 13 are arranged in a circular array around the axis of the rotating component 3. The connecting contact 15 is fixedly installed on the side wall of the support plate 14 near the rotating component 3, and the structure of the connecting contact 15 is the same as that of the second stationary contact 13. The positioning plate 16 is fixedly installed on the side wall of the support plate 14 near the rotating component 3.

[0045] When the grounding needs to be converted to opening, the rotating part 3 starts to drive one end of the moving contact 2 away from the limiting part 24 and the stationary contact 13, and the other end away from the stationary contact 12, so that both ends of the moving contact 2 are separated from the stationary contact 13 and the stationary contact 12, thereby realizing the opening; when the opening needs to be converted to closing, the rotating part 3 continues to rotate to drive one end of the moving contact 2 to approach the connecting contact 15 and the other end to approach the stationary contact 12, so that the stationary contact 12 and the connecting contact 15 are fully inserted into the insertion space 22 at both ends of the moving contact 2, and the moving contact 2 is positioned against the positioning plate 16, thereby realizing the closing, so that the conductor 11 can transmit the current to the arc-extinguishing chamber.

[0046] The working principle of this application embodiment is as follows: When grounding is required, the rotating component 3 rotates to drive the two ends of the moving contact 2 to approach and contact the stationary contact 12 and stationary contact 23. The current flow provides electrical assistance to the moving contact 2 to approach the stationary contact 12 and stationary contact 23, making it easier for the stationary contact 12 and moving contact 22 to be inserted and installed into the insertion space 22 located at both ends of the moving contact 2. The moving contact 2 is positioned against the limiting component 24, so that the stationary contact 12 and stationary contact 23 are completely inserted and installed into both ends of the moving contact 2. This achieves convenient and quick grounding, saves the time spent on grounding, makes the electrical connection more stable, and reduces the risk of ablation, further reducing the risk of causing significant production losses.

[0047] When the switch needs to be opened, the rotating part 3 drives the moving contact 2 to separate from the static contact one 12 and the static contact two 13, so as to realize the opening of the switch; when the switch needs to be closed, the rotating part 3 drives the moving contact 2 to be close to the static contact one 12 and the connecting contact 15, so that the static contact one 12 and the connecting contact 15 are inserted and installed on the insertion space 22 at both ends of the moving contact 2, and the moving contact 2 is positioned against the positioning plate 16, thereby realizing the closing of the switch, improving the stability in the control process, and further reducing the risk of causing significant production loss.

[0048] Embodiment 2, refer to Figures 3-6 The difference between this embodiment and embodiment 1 is that the connecting block 81 is connected to the middle position of the reversing part one 25, and the slide 6 is fixedly installed on the side wall of the reversing part one 25 close to the rotating part 3, and the slide 6 extends to both sides of the connecting block 81 at both ends, and the positioning part 7 for positioning the static contact one 12 under the action of the adsorption force is arranged at both ends of the slide 6.

[0049] When grounding is needed, the static contact one 12 is positioned against one end of the slide 6 close to the static contact two 13, and the static contact one 12 is positioned by the positioning part 7 and generates electric assistance force to the moving contact 2; when the switch needs to be closed, the static contact one 12 is positioned against one end of the slide 6 close to the connecting contact 15, and the static contact one 12 is positioned by the positioning part 7 and generates electric assistance force to the moving contact 2 when the moving contact 2 rotates; when the static contact one 12 is positioned on both ends of the slide 6, the direction of the electric current from the connecting position of the connecting block 81 and the reversing part one 25 to the connecting position of the static contact one 12 and the slide 6 is reversed by 180 degrees, so that the directions of the forces acting on the moving contact 2 are opposite in the grounding and closing states, so that the electric assistance force is generated to the moving contact 2 when the moving contact 2 rotates clockwise and counterclockwise, so that the static contact one 12 and the moving contact 2 are completely inserted and connected when the moving contact 2 rotates forward and backward, and grounding or closing is facilitated.

[0050] The positioning part 7 is two magnets 71 and two iron blocks 72, the two magnets 71 are embedded on both ends of the slide 6, and the two iron blocks 72 are embedded on the side wall of the static contact one 12 close to the two magnets 71, so that when the static contact one 12 is positioned on both ends of the slide 6, the magnets 71 are adsorbed on the iron blocks 72 to position the static contact one 12.

[0051] The working principle of the embodiment of the application is: The rotating member 3 drives the movable contact 2 to rotate, and the rotation of the movable contact 2 makes the static contact one 12 move away from the positioning member 7, moves to the other end of the slide 6 and is adsorbed and positioned by the positioning member 7, makes the movable contact 2 separate from the static contact one 12 and the static contact two 13, and realizes the grounding switching to the opening; the rotating member 3 continues to rotate to drive the movable contact 2 to approach and contact the static contact one 12 and the connecting contact 15 at both ends, respectively, the electric force of the current makes the movable contact 2 approach the static contact one 12, so that the movable contact 2 is more convenient to realize the plug-in connection with the static contact one 12 and the connecting contact 15, until the movable contact 2 abuts on the positioning member 7 to be positioned, thereby realizing the closing.

[0052] The rotating member 3 rotates back, one end of the movable contact 2 separates from the connecting contact 15, and the other end of the movable contact 2 pushes the static contact one 12 to move back to the slide 6 to approach one end of the static contact two 13 and then separates from the static contact one 12, and the static contact one 12 is positioned by the positioning member 7, thereby realizing the opening; the rotating member 3 continues to rotate back, and then drives the movable contact 2 to contact the static contact one 12 and the static contact two 13 at both ends, respectively, the direction of the current is reversed by 180 degrees relative to the closing, and then the electric force of the current pushes the movable contact 2 to approach the static contact one 12 and the static contact two 13, so that it is convenient to realize the grounding, thereby realizing the convenient closing and grounding at the same time, saves the time spent, and reduces the risk of causing significant production loss.

[0053] The embodiment of the application discloses a ring main unit.

[0054] The ring main unit comprises a cabinet body and a three-position switch arranged on the cabinet body.

[0055] The above are the preferred embodiments of the application, and are not used to limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A double-break three-position switch with advantageous grounding and closing capability, characterized in that: Includes three control switches (1), each control switch (1) comprising: A wire (11) is installed on the cabinet and is used for inputting current; Stationary contact one (12) and stationary contact two (13) are respectively provided with commutation part one (25) and commutation part two (26). The commutation part one (25) is connected to the conductor (11) through the connecting assembly (8). The three commutation parts two (26) are connected through the grounding assembly (5) and are used to input current into the ground. The moving contact (2) is rotatably mounted on the cabinet so that the moving contact (2) is connected to the stationary contact one (12) and the stationary contact two (13) to achieve grounding, or so that the moving contact (2) is disconnected from the stationary contact one (12) and the stationary contact two (13) to achieve circuit breaking; the commutation part one (25) and the commutation part two (26) cause the current direction to be reversed by 180 degrees and the electric repulsion force on both ends of the moving contact (2) is converted into electric assist.

2. The double-break three-position switch with advantageous grounding and closing as described in claim 1, characterized in that: A rotating component (3) is rotatably mounted on the cabinet. All three moving contacts (2) are mounted on the rotating component (3). Each moving contact (2) includes two isolation blades (21). A plug-in space (22) is formed between the two isolation blades (21). The first stationary contact (12) and the second stationary contact (13) are plugged into the plug-in space (22) and pressed against the two isolation blades (21) to achieve electrical connection.

3. A double-break three-position switch with advantageous grounding and closing as described in claim 2, characterized in that: The two isolation blades (21) are connected to the rotating member (3) via a fixing assembly (4), the fixing assembly (4) comprising: Two elastic pads (41) are set on the opposite side walls of the two isolation contact blades (21) and are elastic and snapped onto the rotating part (3) for positioning; A fixing screw (42) passes through two elastic pads (41) and a rotating part (3) and is threadedly connected to a fixing nut that presses against the rotating part (3) for positioning. The fixing screw (42) is threadedly connected to the two elastic pads (41) for positioning.

4. A double-break three-position switch with advantageous grounding and closing as described in claim 1, characterized in that: The stationary contact 1 (12) and stationary contact 2 (13) are provided with protrusions (23) on opposite sides of the moving contact (2) and the two protrusions (23) press against the two isolation blades (21) to achieve electrical connection; the stationary contact 2 (13) is provided with a limiting member (24) and the moving contact (2) is positioned against the limiting member (24) after rotation and grounding is achieved.

5. A double-break three-position switch with advantageous grounding and closing as described in claim 1, characterized in that: The grounding component (5) includes: The connecting plate (51) connects the three stationary contacts (13) to each other; The support plate (52) is set on the connecting plate (51) and is used for grounding and cooperates with the connecting plate (51) to conduct the current on the stationary contact two (13) to the ground.

6. A double-break three-position switch with advantageous grounding and closing as described in claim 1, characterized in that: The connecting assembly (8) includes a connecting block (81) and a connecting screw (82), the connecting screw (82) passing through the reversing part (25) and threadedly connected to the connecting block (81).

7. A double-break three-position switch with advantageous grounding and closing according to claim 2, characterized in that: The control switch (1) further includes: The tray (14) is installed on the cabinet; The connecting contact (15) is set on the support plate (14) and electrically connected to the arc-extinguishing chamber. It is arranged in a circular array with the stationary contact one (12) and stationary contact two (13) around the rotating axis of the moving contact (2). Positioning plate (16) is set on tray (14); The moving contact (2) rotates away from the stationary contact (13) and gets closer to the connecting contact (15), so that the two ends of the moving contact (2) are connected to the stationary contact (12) and the connecting contact (15) to achieve closing and are positioned against the positioning plate (16).

8. A double-break three-position switch with advantageous grounding and closing as described in claim 7, characterized in that: The reversing part (25) is provided with a slide (6) for sliding the stationary contact (12). The two ends of the slide (6) are located on both sides of the connecting assembly (8) and are provided with positioning elements (7) for the stationary contact (12) under the action of adsorption force. When grounding is required, the stationary contact 1 (12) is positioned against the end of the slide rail (6) near the stationary contact 2 (13) and is positioned by the positioning element (7) to provide electric assistance to the moving contact (2); when closing is required, the stationary contact 1 (12) is positioned against the end of the slide rail (6) near the connecting contact (15) and is positioned by the positioning element (7) to provide electric assistance to the moving contact (2) when it rotates.

9. A double-break three-position switch with advantageous grounding and closing as described in claim 8, characterized in that: The positioning component (7) consists of two magnets (71) and two iron blocks (72). The two magnets (71) are set at both ends of the slide (6), and the two iron blocks (72) are set on the opposite side walls of the stationary contact (12). When the stationary contact (12) abuts against one end of the slide (6), the magnets (71) are attracted to the iron blocks (72) to position the stationary contact (12).

10. A ring main unit, characterized in that: Includes a cabinet and a switch installed on the cabinet as described in any one of claims 1-9.

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