A 24KV switch cabinet

Abstract

The present invention belongs to the technical field of switch cabinets, and specifically relates to a 24KV switch cabinet. The 24kV switch cabinet of the present invention, by covering the outer side of the moving contact member with a first insulating sleeve, and the lower end of the first insulating sleeve is located at both sides of the rotating shaft along the length direction and has insulating baffles extending downward respectively, so that when the moving contact member is in the isolation position or the closing position, arc discharge between the moving contact member and the cabinet shell is avoided, and the reliability of the use of the 24KV switch cabinet can be improved while reducing the production size of the cabinet shell, which is convenient for product transportation, installation and maintenance. In addition, the two sides of the moving contact member are respectively connected by an insulating connecting rod assembly and an operating shaft, and an insulating baffle is also provided between the moving contact member and the operating shaft, so that the two sides of the moving contact member are stably stressed, and have the advantages of good transmission stability and more precise swinging of the moving contact member during the opening and closing actions. At the same time, the risk of arc discharge between the moving contact member and the operating shaft is avoided, and the switch cabinet has good reliability in use.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinets, and in particular relates to a 24KV switch cabinet. Background Art

[0002] In the power system, high-voltage switchgear such as 24KV switchgear plays a vital role. They are responsible for the distribution, control and protection of electric energy to ensure the safe and stable operation of the power grid. However, with the continuous growth of power demand and the increase of power grid complexity, higher requirements are placed on the safety and reliability of high-voltage switchgear.

[0003] In the existing 24KV switchgear design, a significant technical challenge is the potential arc discharge problem between the moving contact component (or knife) and the metal cabinet during operation. Since the knife needs to swing greatly in the cabinet when closing or opening the circuit, if the insulation distance between the knife and the cabinet or other metal parts is insufficient during this process, it is very easy to generate an arc under the action of the high-voltage electric field. The high temperature and high energy of the arc will not only cause serious ablation and damage to the equipment itself, but also may cause an explosion accident, seriously threatening the safety of operators and the stable operation of the power system.

[0004] In order to cope with this technical challenge, the traditional approach is to increase the overall size of the switch cabinet to increase the safe distance between the switch blade and the cabinet shell, thereby reducing the risk of arc discharge. However, this approach not only increases material and manufacturing costs, but also occupies more space resources, which is not conducive to the compact layout and efficient use of power facilities. In addition, the oversized size may also cause inconvenience in transportation, installation and maintenance. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem of overall size caused by the existing 24KV switch cabinet reducing the risk of arc discharge by increasing the safety distance between the moving contact component and the cabinet shell, and to provide a method of avoiding the problem of arc discharge by adopting insulation protection for the moving contact component, thereby reducing the overall size of the switch cabinet.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A 24KV switch cabinet comprises a cabinet shell and a conductive component; the cabinet shell is provided with a switch room and a cable room arranged from top to bottom, and a cable bushing is provided in the cable room; the conductive component is arranged in the switch room, and comprises a bracket and an insulating pull rod, a main busbar assembly, a vacuum arc chamber component, an isolating static contact component and a three-position switch arranged on the bracket in sequence, the cable bushing is connected to the three-position switch through the cable busbar, the main busbar assembly is connected to the upper end moving contact part of the vacuum arc chamber component through a soft connector, the lower end fixed contact part of the vacuum arc chamber component is connected to the isolating static contact component, and when the insulating pull rod is driven, it is used to push the upper end moving contact part of the vacuum arc chamber component to realize electrical connection with the fixed contact part, so that the main busbar assembly is connected through The vacuum arc chamber component and the three-position switch realize the electrical connection with the cable bushing; the three-position switch includes a moving contact component with one end rotatably connected to the cable bus, a first insulating sleeve covering the outer side of the moving contact component as a whole, and a three-position operating mechanism transmission-connected to the moving contact component, and the other end of the moving contact component is a moving contact extending out of the first insulating sleeve; the three-position operating mechanism is used to drive the moving contact component to swing relative to each other, so that the moving contact contacts or separates from the isolating static contact component, so as to realize the control cable bushing to be connected or disconnected with the main bus assembly through the vacuum arc chamber component, and to make the moving contact connected or disconnected with the grounding circuit, so as to realize the control cable bushing to be connected or disconnected with the grounding circuit through the vacuum arc chamber component.

[0008] Compared with the prior art, the 24KV switch cabinet of the present invention, by covering the first insulating sleeve on the outer side of the moving contact component, can avoid arc discharge between the moving contact component and the cabinet shell when the moving contact component is in the isolation position or the closing position, thereby improving the reliability of the 24KV switch cabinet and reducing the production size of the cabinet shell, making it convenient for product transportation, installation and maintenance.

[0009] Furthermore, the lower end of the moving contact member is rotatably connected to the upper end of the cable busbar via a rotating shaft, and the lower end of the first insulating sleeve is located on both sides of the rotating shaft along the length direction and has insulating barriers extending downward respectively; through such an arrangement, by providing an insulating barrier at the root position of the lower end of the moving contact member, the risk of arc discharge between the moving contact member and the cabinet housing is further reduced.

[0010] Furthermore, the three-position operating mechanism includes a driving device, an operating shaft and two groups of insulating link assemblies respectively located on both sides of the moving contact member, the operating shaft is located on one side of the bracket, and the operating shaft is transmission-connected to the moving contact member through the two groups of insulating link assemblies; the insulating link assembly includes a first insulating link connected to the operating shaft, a second insulating link connected to the side of the moving contact member, and a third insulating link arranged between the first insulating link and the second insulating link, and the two ends of the third insulating link are rotationally connected to the adjacent ends of the first edge link and the second edge link respectively; through such an arrangement, the two sides of the moving contact member are transmission-connected respectively through the insulating link assemblies, the two sides of the moving contact member are subjected to stable force, the transmission stability is good, and the swing of the moving contact member is more precise during the opening and closing actions, and the driving device can adopt an existing mechanical device for driving the operating shaft to rotate relative to each other.

[0011] Furthermore, the switch room side wall plate is provided with a grounding circuit component connected to the grounding circuit, the isolating static contact component is provided with an isolating static contact, the grounding circuit component is provided with a three-phase grounding static contact, and the three positions of the three-position switch respectively correspond to the closing position where the moving contact is in contact with the isolating static contact, the isolating position where the moving contact is suspended between the three-phase grounding static contact and the isolating static contact, and the grounding position where the moving contact is in contact with the three-phase grounding static contact; the bracket is provided with a movable avoidance opening on one side close to the grounding circuit component, and the bracket is provided with transmission avoidance openings on both sides close to the insulating connecting rod assembly, and the moving contact component is relatively swung through the movable avoidance openings. The opening extends out to contact and cooperate with the grounding loop component, and the insulating connecting rod assembly is transmission-connected to the moving contact component through the transmission avoidance opening; the bracket is provided with an insulating baffle on the side close to the operating shaft, and the moving contact component and the operating shaft are respectively located on both sides of the insulating baffle; the bracket is provided with an insulating partition between the movable avoidance opening and the side wall plate of the switch room, and insulating partitions are also provided on the front and rear sides of the bracket respectively; through such an arrangement, the bracket is provided with an insulating baffle on the side close to the operating shaft, which better avoids the risk of arc discharge between the moving contact component and the operating shaft, and also avoids the risk of arc discharge between the moving contact component and the side wall plate of the switch room.

[0012] Furthermore, the three-position operating mechanism also includes a rotation limit piece arranged on the operating shaft, and a limit buffer structure is correspondingly provided on the side wall plate of the switch chamber close to the operating shaft side, and a first limit push rod and a second limit push rod are respectively provided on both sides of the rotation limit piece, and a first limit surface is provided at the end of the first limit push rod, and a second limit surface is provided at the end of the second limit push rod, and the angle between the two limit push rods corresponds to the swinging of the moving contact member between the isolating static contact member and the grounding circuit member. When the moving contact member is swung into position relative to the isolating static contact member, the first limit push rod rotates with the operating shaft to the first limit surface and abuts against the limit buffer structure. When the moving contact member is swung into position relative to the grounding circuit member, the second limit push rod rotates with the operating shaft to the second limit surface and abuts against the limit buffer structure. Through such an arrangement, when the moving contact member moves into position relative to the isolating static contact member or the three-phase grounding static contact, it is limited by the rotation limit piece to avoid excessive movement of the moving contact member and collision loss.

[0013] Furthermore, the position limiting buffer structure includes a buffer baffle and a buffer pad, and the buffer baffle is arranged on the side wall plate of the switch room through the buffer pad; through such an arrangement, the position limiting buffer structure is simply arranged and has a good buffering effect.

[0014] Furthermore, the main busbar assembly includes side expansion sleeves connected to both sides of the flexible connector, the vacuum arc chamber component is connected to the flexible connector, and also includes a circuit breaker operating mechanism, the circuit breaker operating mechanism is used to drive the insulating pull rod to move up and down relatively through the transmission structure, so as to push the moving contact part of the vacuum arc chamber component to close or open the circuit through the conductive rod and the fixed contact part, so as to realize the circuit between the vacuum arc chamber component and the cable busbar; the transmission structure includes a main shaft and a transmission connecting rod connected to the main shaft, the outer end of the transmission connecting rod is rotatably connected to the upper end of the insulating pull rod, and the circuit breaker operating mechanism is used to drive the main shaft to rotate relatively in forward and reverse directions, and further drive the insulating pull rod to move up and down through the transmission connecting rod; through such a setting, the transmission structure is simple to set up and convenient for production and manufacturing. The circuit breaker operating mechanism can adopt an existing mechanical device for driving the main shaft to rotate relatively.

[0015] Furthermore, the left wall plate and the right wall plate of the switch room are respectively provided with support beams on the upper and lower sides of the side expansion sleeve, so that the side expansion sleeve has better supporting force when connecting external cables.

[0016] Furthermore, it also includes a top mounting beam and a bottom mounting beam, the top of the bracket is connected to the top of the switch chamber through the top mounting beam, and the bottom of the bracket is installed at the bottom of the switch chamber through the bottom mounting beam; the bracket includes two relatively arranged insulating isolation frames, and an upper positioning plate, a middle positioning plate and a bottom insulating positioning plate arranged from top to bottom between the insulating isolation frames on both sides, the upper end of the vacuum arc chamber component is connected to the upper positioning plate, and the lower end thereof is connected to the middle positioning plate, the isolating static contact component is connected to the bottom of the middle positioning plate, and the three-position switch is arranged between the middle positioning plate and the bottom insulating positioning plate, and the bottom insulating positioning plate is vertically provided with a corrugated sleeve, the cable busbar is placed in the corrugated sleeve and extends from the upper end of the corrugated sleeve to be rotatably connected to the lower end of the driven contact component; through such an arrangement, the conductive component has a simple structure, which is convenient for the insulating pull rod, the main busbar component, the vacuum arc chamber component, the isolating static contact component and the three-position switch to be installed on the bracket and then installed in the cabinet shell together with the bracket, so as to facilitate product assembly and manufacturing.

[0017] Furthermore, a cable bushing is provided at the outer end of the cable sheath, an insulating cap is sleeved at the lower end of the cable busbar, a first connecting skirt and a second connecting skirt located at the outer periphery of the first connecting skirt are extended outward from the side of the insulating cap, two groups of clamping protrusions are provided along the axial direction on the inner periphery of the first connecting skirt, a plug-in cavity matching the shape of the first connecting skirt and the second connecting skirt is provided on the outer side of the cable bushing, and a plug-in groove matching the two groups of clamping protrusions is provided on the inner periphery of the plug-in cavity; through such an arrangement, the assembly connection between the cable bushing and the cable busbar is firm and the insulation effect is good.

[0018] Furthermore, the isolating static contact component is provided with a moving knife buffer on the side away from the moving contact, and when the moving contact follows the moving contact component and is closed in place relative to the isolating static contact component, the moving contact buffer stops on the moving knife buffer, and an electric field control component is provided at the lower end of the isolating static contact component; the grounding loop component is provided with a grounding buffer on the side away from the moving contact component, and when the moving contact follows the moving contact component and is closed in place relative to the grounding loop component, the moving contact buffer stops on the grounding buffer; through such an arrangement, the relative excessive movement of the moving contact component is effectively limited, and the limiting buffer effect of the moving contact component is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the internal structure of a 24KV switch cabinet.

[0020] Figure 2 It is a schematic diagram of a three-position switch and a bracket.

[0021] Figure 3 Schematic diagram of conductive components Figure 1 .

[0022] Figure 4 Schematic diagram of conductive components Figure 2 .

[0023] Figure 5 Schematic diagram of conductive components Figure 3 .

[0024] Figure 6 Schematic diagram of conductive components Figure 4 .

[0025] Figure 7 This is a schematic diagram of the assembly of the cable bushing and the insulating cap.

[0026] Figure 8 Analytical view of the cable bushing and insulation cap.

[0027] Fig. 9 for Figure 8 Cross-sectional view of BB.

[0028] Fig.10 It is an isometric view of three sets of conductive components.

[0029] Description of reference numerals: cabinet 1, conductive component 2, switch room 11, cable room 12, cable bushing 13, bracket 20, insulating pull rod 21, main busbar assembly 22, vacuum interrupter component 23, isolating static contact component 24, three-position switch 3, cable bus 14, moving contact component 31, first insulating sleeve 32, operating shaft 33, insulating stop edge 321, first insulating connecting rod 34, second insulating connecting rod 35, third insulating connecting rod 36, grounding loop component 15, movable avoidance 201, transmission avoidance 202, insulating baffle 203, rotation limiter 37, first limiter top rod 371, second limiter top rod 372, first limiter surface 373, second limiter surface 374, buffer baffle 381, buffer pad 382, ​​side expansion sleeve 221, top mounting beam 16, insulating isolation frame 203, upper positioning plate 204, middle positioning plate 205, bottom insulating positioning plate 206, corrugated sleeve 207, cable bushing 131, insulating cap 141, first connecting skirt 142, second connecting skirt 143, clamping protrusion 144, plug-in cavity 132, clamping groove 133, insulating partition plate 208, first lateral connecting frame 111, second lateral connecting frame 112, moving knife buffer 245, grounding buffer 155, rotating shaft 311, flexible connector 29, main shaft 51, transmission connecting rod 52, moving contact part 231, fixed contact part 232, insulating partition 384, support beam 219. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0031] See also Figures 1 to 10 The 24kV switch cabinet of the present invention comprises a cabinet shell 1 and a conductive component 2; the cabinet shell 1 is provided with a switch room 11 and a cable room 12 arranged from top to bottom, and a cable bushing 13 is provided in the cable room 12; the conductive component 2 is arranged in the switch room 11, and comprises a bracket 20 and an insulating pull rod 21, a main busbar assembly 22, a vacuum arc chamber component 23, an isolating static contact component 24 and a three-position switch 3 arranged in sequence on the bracket 20, the cable bushing 13 is connected to the three-position switch 3 through the cable bus 14, the main busbar assembly 22 is connected to the upper end moving contact part 231 of the vacuum arc chamber component 23 through a soft connector 29, the lower end fixed contact part 232 of the vacuum arc chamber component 23 is connected to the isolating static contact component 24, and the insulating pull rod 21 is used to push the upper end moving contact part 231 and the fixed contact part 232 of the vacuum arc chamber component 23 to realize power on when being driven. The three-position switch 3 comprises a moving contact component 31 rotatably connected to the cable bus 14 at one end, a first insulating sleeve 32 covering the outer side of the moving contact component 31 as a whole, and a three-position operating mechanism transmission-connected to the moving contact component 31, and the other end of the moving contact component 31 is a moving contact extending from the first insulating sleeve 32; the three-position operating mechanism is used to drive the moving contact component 31 to swing relative to each other, so that the moving contact contacts or separates from the isolating static contact component 24, so as to control the cable casing 13 to be connected or disconnected with the main bus assembly 22 through the vacuum arc extinguishing chamber component 23, and to connect or disconnect the moving contact with the grounding circuit, so as to control the cable casing 13 to be connected or disconnected with the grounding circuit through the vacuum arc extinguishing chamber component 23.

[0032] Compared with the prior art, the 24KV switch cabinet of the present invention, by covering the first insulating sleeve 32 on the outer side of the moving contact member 31, can avoid arc discharge between the moving contact member 31 and the cabinet shell 1 when the moving contact member 31 is in the isolation position or the closing position, thereby improving the reliability of the 24KV switch cabinet and reducing the production size of the cabinet shell 1, making it convenient for product transportation, installation and maintenance.

[0033] See also Figures 1 to 6In one embodiment, the lower end of the moving contact member 31 is rotatably connected to the upper end of the cable bus 14 through a rotating shaft 311, and the lower end of the first insulating sleeve 32 is located on both sides of the rotating shaft 311 along the length direction and has insulating baffles 321 extending downward respectively; by setting up the insulating baffle 321 at the root position of the lower end of the moving contact member 31, the risk of arc discharge between the moving contact member 31 and the cabinet housing 1 is further reduced.

[0034] See also Figures 1 to 6 In one embodiment, the three-position operating mechanism includes a driving device (not shown), an operating shaft 33 and two groups of insulating connecting rod assemblies respectively located on both sides of the moving contact member 31, wherein the operating shaft 33 is located on one side of the bracket 20, and the operating shaft 33 is connected to the moving contact member 31 through the two groups of insulating connecting rod assemblies; the insulating connecting rod assembly includes a first insulating connecting rod 34 connected to the operating shaft 33, a second insulating connecting rod 35 connected to the side of the moving contact member 31, and a third insulating connecting rod 36 arranged between the first insulating connecting rod 34 and the second insulating connecting rod 35, and the two ends of the third insulating connecting rod 36 are respectively connected to the adjacent ends of the first edge connecting rod and the second edge connecting rod for rotation; through such an arrangement, the two sides of the moving contact member 31 are respectively connected through the insulating connecting rod assemblies for transmission, the two sides of the moving contact member 31 are subjected to stable force, the transmission stability is good, and the swing of the moving contact member 31 during the opening and closing action is more accurate, and the driving device can adopt an existing mechanical device for driving the operating shaft 33 to rotate relative to each other.

[0035] See also Figure 1 , Figure 3 and Figure 6In one embodiment, the side wall plate of the switch room 11 is provided with a grounding circuit component 15 connected to the grounding circuit, the isolating static contact component 24 is provided with an isolating static contact, the grounding circuit component 15 is provided with a three-phase grounding static contact, and the three positions of the three-position switch 3 respectively correspond to the closing position where the moving contact contacts the isolating static contact, the isolating position where the moving contact is suspended between the three-phase grounding static contact and the isolating static contact, and the grounding position where the moving contact contacts the three-phase grounding static contact; the bracket 20 is provided with a movable avoidance opening 201 on one side close to the grounding circuit component 15, and the bracket 20 is provided with transmission avoidance openings 202 on both sides close to the insulating connecting rod assembly, and when the moving contact component 31 swings relatively, it extends out through the movable avoidance opening 201 to contact the grounding circuit The component 15 is in contact and matched, and the insulating connecting rod assembly is connected to the moving contact component 31 through the transmission avoidance opening 202; the bracket 20 is provided with an insulating baffle 203 on the side close to the operating shaft 33, and the moving contact component 31 and the operating shaft 33 are respectively located on both sides of the insulating baffle 203, and the bracket 20 is provided with an insulating partition 384 between the movable avoidance opening 201 and the side wall plate of the switch chamber 11, and the front and rear sides of the bracket 20 are also provided with insulating partitions 384 respectively; through such an arrangement, the bracket 20 is provided with an insulating baffle 203 on the side close to the operating shaft 33, which better avoids the risk of arc discharge between the moving contact component 31 and the operating shaft 33, and also avoids the risk of arc discharge between the moving contact component 31 and the side wall plate of the switch chamber 11.

[0036] See also Figure 1 , Figure 3 and Figure 6 In one embodiment, the three-position operating mechanism further includes a rotation limiter 37 arranged on the operating shaft 33, and a side wall plate of the switch chamber 11 close to the operating shaft 33 is correspondingly provided with a limit buffer structure, and a first limiter push rod 371 and a second limiter push rod 372 are respectively provided on both sides of the rotation limiter 37, and a first limiter surface 373 is provided at the end of the first limiter push rod 371, and a second limiter surface 374 is provided at the end of the second limiter push rod 372. The angle between the two limiter push rods corresponds to the swinging position of the moving contact component 31 between the isolating static contact component 24 and the grounding loop component 15. The moving contact When the head component 31 is swung into position relative to the isolating static contact component 24, the first limiting push rod 371 rotates with the operating shaft 33 to the first limiting surface 373 and abuts against the limiting buffer structure; when the moving contact component 31 is swung into position relative to the grounding loop component 15, the second limiting push rod 372 rotates with the operating shaft 33 to the second limiting surface 374 and abuts against the limiting buffer structure; through such an arrangement, when the moving contact component 31 moves into position relative to the isolating static contact component 24 or the three-phase grounding static contact, it is limited by rotating the limiting member 37 to avoid excessive movement of the moving contact component 31 and collision loss.

[0037] See also Figure 1 , Figure 3 and Figure 6 In one embodiment, the position limiting buffer structure includes a buffer baffle 381 and a buffer pad 382, ​​and the buffer baffle 381 is arranged on the side wall plate of the switch chamber 11 through the buffer pad 382; through such an arrangement, the position limiting buffer structure is simply arranged and has a good buffering effect.

[0038] See also Figure 1 , Figure 3 and Figure 6 In one embodiment, the main busbar assembly 22 includes a side expansion sleeve 221 connected to both sides of the soft connector 29, the vacuum arc chamber component 23 is connected to the soft connector 29, and also includes a circuit breaker operating mechanism, the circuit breaker operating mechanism is used to drive the insulating pull rod 21 to move up and down relatively through the transmission structure, thereby pushing the moving contact part 231 of the vacuum arc chamber component 23 to close or open the circuit through the conductive rod and the fixed contact part 232, so as to realize the circuit between the vacuum arc chamber component 23 and the cable bus 14; the transmission structure includes a main shaft 51 arranged on the top mounting beam 16 and a transmission connecting rod 52 connected to the main shaft 51, the outer end of the transmission connecting rod 52 is rotatably connected to the upper end of the insulating pull rod 21, and the circuit breaker operating mechanism is used to drive the main shaft 51 to rotate relatively in the forward and reverse directions, and further drive the insulating pull rod 21 to move up and down through the transmission connecting rod 52; through such a setting, the transmission structure setting method is simple and convenient for production and manufacturing. The circuit breaker operating mechanism may adopt an existing mechanical device for driving the main shaft 51 to rotate relative to each other.

[0039] In one embodiment, the left wall plate and the right wall plate of the switch room 11 are respectively provided with support beams 219 on the upper and lower sides of the side expansion sleeve 221, so that the side expansion sleeve 221 has better supporting force when connecting external cables.

[0040] See also Figure 1In one embodiment, it further includes a top mounting beam 16, and the top of the bracket 20 is connected to the top of the switch chamber 11 through the top mounting beam 16; the bracket 20 includes two insulating isolation frames 203 arranged opposite to each other, and an upper positioning plate 204, a middle positioning plate 205 and a bottom insulating positioning plate 206 arranged from top to bottom between the insulating isolation frames 203 on both sides, and the two insulating isolation frames 203 are respectively connected to both sides of the upper positioning plate 204 and the bottom insulating positioning plate 206, so that the bracket 20 forms a frame structure, and the upper end of the vacuum arc extinguishing chamber component 23 is connected to the upper positioning plate 204, and the lower end thereof is connected to the middle positioning plate 205, The isolating static contact component 24 is connected to the bottom of the middle positioning plate 205, and the three-position switch 3 is arranged between the middle positioning plate 205 and the bottom insulating positioning plate 206. The bottom insulating positioning plate 206 is vertically provided with a corrugated sleeve 207. The cable bus 14 is placed in the corrugated sleeve 207 and extends from the upper end of the corrugated sleeve 207 and is rotatably connected to the lower end of the driven contact component 31. Through such an arrangement, the conductive component 2 has a simple structure, which is convenient for the insulating pull rod 21, the main busbar component 22, the vacuum arc extinguishing chamber component 23, the isolating static contact component 24 and the three-position switch 3 to be installed on the bracket 20 and then installed in the cabinet shell 1 together with the bracket 20, which is convenient for product assembly and manufacturing.

[0041] See also Figures 1 to 10 In one embodiment, a cable bushing 131 is provided at the outer end of the cable sleeve 13, and an insulating cap 141 is sleeved at the lower end of the cable busbar 14. The side of the insulating cap 141 extends outward to form a first connecting skirt 142 and a second connecting skirt 143 located at the outer periphery of the first connecting skirt 142. Two groups of clamping protrusions 144 are provided along the axial direction on the inner periphery of the first connecting skirt 142. An inserting cavity 132 matching the shape of the first connecting skirt 142 and the second connecting skirt 143 is provided on the outer side of the cable bushing 131, and a clamping groove 133 matching the two groups of clamping protrusions 144 is provided on the inner periphery of the inserting cavity 132. Through such an arrangement, the assembly connection between the cable bushing 131 and the cable busbar 14 is stable, and the insulation effect is good.

[0042] See also Figure 1 , Figure 3 and Figure 6In one embodiment, a moving blade buffer 245 is provided on the side of the isolating static contact member 24 away from the moving contact. When the moving contact follows the moving contact member 31 to close in place relative to the isolating static contact member 24, the moving contact buffer stops on the moving blade buffer 245. An electric field control member is provided at the lower end of the isolating static contact member 24. A grounding buffer 155 is provided on the side of the grounding loop member 15 away from the moving contact. When the moving contact follows the moving contact member 31 to close in place relative to the grounding loop member 15, the moving contact buffer stops on the grounding buffer 155. The moving blade buffer 245 and the grounding buffer 155 are made of insulating material, preferably PU material. Through such an arrangement, the relative excessive movement of the moving contact member 31 is effectively limited, and the limiting buffer effect of the moving contact member 31 is good.

[0043] See also Figure 1 , Figure 3 and Figure 6 In one embodiment, it also includes a first lateral connecting frame 111 and a second lateral connecting frame 112, the operating shaft 33 and the rotation limit member 37 are connected to the two side wall panels of the cabinet shell 1 through the first lateral connecting frame 111, and the grounding loop component 15 is connected to the two side wall panels of the cabinet shell 1 through the second lateral connecting frame 112, and the two sides of the bottom insulating positioning plate 206 are respectively connected to the first lateral connecting frame 111 and the second lateral connecting frame 112 to support the conductive component 2.

[0044] See also Fig.10 In one embodiment, the conductive components 2 and the three-position switches 3 are provided in three groups respectively, and the three groups of conductive components 2 and the three-position switches 3 are installed in the cabinet shell 1 along the longitudinal direction. The three groups of conductive components 2 share the same top mounting beam 16, and an insulating partition plate 208 is provided between adjacent brackets 20.

[0045] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A 24KV switch cabinet, characterized in that: include: The cabinet shell is provided with a switch room and a cable room arranged from top to bottom, and the cable room is provided with a cable bushing; A conductive component is arranged in the switch room, comprising a bracket and an insulating pull rod, a main busbar assembly, a vacuum arc chamber component, an isolating static contact component and a three-position switch arranged in sequence on the bracket, the cable bushing is connected to the three-position switch through the cable busbar, the main busbar assembly is connected to the moving contact part at the upper end of the vacuum arc chamber component through a soft connector, the fixed contact part at the lower end of the vacuum arc chamber component is connected to the isolating static contact component, and when the insulating pull rod is driven, it is used to push the moving contact part and the fixed contact part at the upper end of the vacuum arc chamber component to achieve electrical connection, so that the main busbar assembly can achieve electrical connection with the cable bushing through the vacuum arc chamber component and the three-position switch; The three-position switch comprises a moving contact member having one end rotatably connected to the cable busbar, a first insulating sleeve covering the outer side of the moving contact member as a whole, and a three-position operating mechanism connected to the moving contact member in a transmission manner, and the other end of the moving contact member is a moving contact extending out of the first insulating sleeve; The three-position operating mechanism is used to drive the moving contact member to swing relative to each other, so that the moving contact and the isolating static contact member are in contact or separated, so as to control the cable bushing to be connected or disconnected with the main busbar assembly through the vacuum interrupter member, and to connect or disconnect the moving contact and the grounding circuit, so as to control the cable bushing to be connected or disconnected with the grounding circuit through the moving contact member; The three-position operating mechanism comprises a driving device, an operating shaft and two sets of insulating connecting rod assemblies respectively located on both sides of the moving contact member, the operating shaft is located on one side of the bracket, and the operating shaft is transmission-connected to the moving contact member through the two sets of insulating connecting rod assemblies; The insulating connecting rod assembly comprises a first insulating connecting rod connected to the operating shaft, a second insulating connecting rod connected to the side of the moving contact member, and a third insulating connecting rod arranged between the first insulating connecting rod and the second insulating connecting rod, wherein two ends of the third insulating connecting rod are rotatably connected to adjacent ends of the first edge connecting rod and the second edge connecting rod respectively; The switch room side wall plate is provided with a grounding circuit component connected to the grounding circuit, the isolating static contact component is provided with an isolating static contact, the grounding circuit component is provided with a three-phase grounding static contact, and the three positions of the three-position switch respectively correspond to a closing position where the moving contact contacts the isolating static contact, an isolating position where the moving contact is suspended between the three-phase grounding static contact and the isolating static contact, and a grounding position where the moving contact contacts the three-phase grounding static contact; The bracket is provided with a movable avoidance opening on one side close to the grounding loop component, and transmission avoidance openings are respectively provided on both sides of the bracket close to the insulating connecting rod assembly. When the moving contact member swings relatively, it extends through the movable avoidance opening to contact and cooperate with the grounding loop component, and the insulating connecting rod assembly is transmission-connected with the moving contact member through the transmission avoidance opening; The bracket is provided with an insulating baffle on one side close to the operating shaft, and the moving contact member and the operating shaft are respectively located on both sides of the insulating baffle; The bracket is provided with an insulating partition between the movable avoidance opening and the side wall plate of the switch room, and the front and rear sides of the bracket are also provided with insulating partitions respectively.

2. The 24KV switch cabinet according to claim 1, characterized in that: The lower end of the moving contact member is rotatably connected to the upper end of the cable busbar via a rotating shaft, and the lower end of the first insulating sleeve is located on both sides of the rotating shaft along the length direction and has insulating stop edges extending downward respectively.

3. The 24KV switch cabinet according to claim 1, characterized in that: The three-position operating mechanism also includes a rotation limit piece arranged on the operating shaft, a side wall plate of the switch chamber close to the operating shaft is correspondingly provided with a limit buffer structure, a first limit push rod and a second limit push rod are respectively provided on both sides of the rotation limit piece, the end of the first limit push rod is provided with a first limit surface, and the end of the second limit push rod is provided with a second limit surface, the angle between the two limit push rods corresponds to the swinging of the moving contact component between the isolating static contact component and the grounding circuit component, when the moving contact component is swung into position relative to the isolating static contact component, the first limit push rod rotates with the operating shaft to the first limit surface and abuts against the limit buffer structure, when the moving contact component is swung into position relative to the grounding circuit component, the second limit push rod rotates with the operating shaft to the second limit surface and abuts against the limit buffer structure.

4. The 24KV switch cabinet according to claim 3 is characterized in that: The position limiting buffer structure comprises a buffer baffle and a buffer pad, and the buffer baffle is arranged on the side wall plate of the switch chamber through the buffer pad.

5. The 24KV switch cabinet according to claim 1, characterized in that: The main busbar assembly includes side expansion sleeves connected to both sides of the flexible connector, the vacuum interrupter component is connected to the flexible connector, and also includes a circuit breaker operating mechanism, the circuit breaker operating mechanism is used to drive the insulating pull rod to move up and down relatively through a transmission structure, Thereby, the moving contact part of the vacuum interrupter component is pushed to close or open the circuit through the conductive rod and the fixed contact part, so as to realize the circuit connection and disconnection between the vacuum interrupter component and the cable busbar; The transmission structure comprises a main shaft and a transmission connecting rod connected to the main shaft, the outer end of the transmission connecting rod is rotatably connected to the upper end of the insulating pull rod, and the circuit breaker operating mechanism is used to drive the main shaft to rotate relative to each other in forward and reverse directions, and further drive the insulating pull rod to move up and down through the transmission connecting rod; The left wall plate and the right wall plate of the switch room are located on the upper side and the lower side of the side expansion sleeve and are respectively provided with support beams.

6. The 24KV switch cabinet according to claim 1, characterized in that: It also includes a top mounting beam and a bottom mounting beam, wherein the top of the bracket is connected to the top of the switch room through the top mounting beam, and the bottom of the bracket is mounted on the bottom of the switch room through the bottom mounting beam; The bracket includes two insulating isolation frames arranged opposite to each other, and an upper positioning plate, a middle positioning plate and a bottom insulating positioning plate arranged from top to bottom between the insulating isolation frames on both sides. The upper end of the vacuum arc extinguishing chamber component is connected to the upper positioning plate, and the lower end thereof is connected to the middle positioning plate. The isolating static contact component is connected to the bottom of the middle positioning plate. The three-position switch is arranged between the middle positioning plate and the bottom insulating positioning plate. The bottom insulating positioning plate is vertically provided with a corrugated sleeve, and the cable busbar is placed in the corrugated sleeve and extends from the upper end of the corrugated sleeve to be rotatably connected to the lower end of the moving contact component.

7. The 24KV switch cabinet according to claim 1, characterized in that: A cable bushing is provided at the outer end of the cable sleeve, an insulating cap is sleeved at the lower end of the cable busbar, a first connecting skirt and a second connecting skirt located at the outer periphery of the first connecting skirt are extended outward from the side of the insulating cap, two groups of clamping protrusions are provided along the axial direction on the inner periphery of the first connecting skirt, an inserting cavity matching the shape of the first connecting skirt and the second connecting skirt is provided on the outer side of the cable bushing, and a clamping groove matching the two groups of clamping protrusions is provided on the inner periphery of the inserting cavity.

8. The 24KV switch cabinet according to claim 1, characterized in that: A moving blade buffer is provided on the side of the isolating static contact component away from the moving contact. When the moving contact is closed relative to the isolating static contact component, the moving contact buffer stops on the moving blade buffer. An electric field control component is provided at the lower end of the isolating static contact component. A grounding buffer is provided on one side of the grounding loop component away from the moving contact component. When the moving contact is closed relative to the grounding loop component, the moving contact is buffered and stopped on the grounding buffer.

Images