Vertical copper bus metal-enclosed high voltage switchgear

Abstract

The application discloses a vertical copper bar metal closed high-voltage switch device, which comprises a switch cabinet, a grounding switch, a contact box and a current transformer assembled in the switch cabinet, the contact box comprises an upper contact box and a lower contact box, a connecting copper bar between outgoing line ends of the upper contact box and a main bus forms an upper branch bus, a connecting copper bar between outgoing line ends of the lower contact box and the current transformer forms a lower branch bus, a copper bar on an outgoing line side of the current transformer is an outgoing line bus, and a connecting copper bar between the outgoing line side of the current transformer and a static knife head of the grounding switch forms a grounding connecting bus; the upper branch bus, the lower branch bus, the outgoing line bus and the grounding connecting bus are connected by vertical copper bars. The vertical copper bar arrangement is changed from the flat copper bar without changing the size of the switch cabinet, so that the clearance air insulation distance between phases and the clearance air insulation distance between phases and the ground in the cabinet meet the requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to a vertical copper bar metal-enclosed high-voltage switchgear. BACKGROUND

[0002] At present, the State Grid Corporation requires that the clearance air insulation distance between phases and between phase and ground in 40.5kV switchgear is not less than 300mm, while the standard size of cabinet width of most manufacturers is 1400mm, and the phase spacing is 350mm. As shown in FIG. 1, the copper bars 100 are arranged in a flat manner, and the width of the copper bars is 60-80mm, which cannot achieve the clearance distance of 300mm. Therefore, composite insulation measures such as copper bar heat-shrinkable sleeve, copper bar surface vulcanization, and installation of phase-to-phase or phase-to-ground insulation plates must be used to achieve the requirement. Some manufacturers have begun to increase the cabinet width to more than 1600mm, but this will greatly increase the cost of cabinet, copper bars, transportation, and the housing of the substation, and also increase the difficulty of on-site installation of the equipment. Figure 1

[0003] If the copper bar heat-shrinkable sleeve is used, the State Grid Corporation clearly stipulates that the heat-shrinkable sleeve cannot be used as a composite insulation medium. If the copper bar surface vulcanization is used, that is, a layer of 2-3mm thick epoxy resin layer is cast on the surface of the copper bar to play an insulation role, but the process is complex, the cost is high, the casting thickness is uneven, and the thickness is thin and brittle, which is easily damaged or cracked due to factors such as handling, installation, thermal expansion and contraction, and thus loses the insulation function.

[0004] If the insulation plate is installed, it is very troublesome, and makes the limited space in the switch cabinet narrower, which easily destroys the electric field distribution in the cabinet, and the surface of the insulation plate is smooth and easy to absorb moisture, which often causes surface creepage and insulation breakdown accidents. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide a vertical copper bar metal-enclosed high-voltage switchgear which does not change the size of the switch cabinet, changes the flat copper bar to vertical copper bar arrangement, and ensures that the clearance air insulation distance between phases and between phase and ground in the cabinet meets the requirements.

[0006] The technical scheme for realizing the present application is as follows

[0007] The vertical copper bar metal-enclosed high-voltage switchgear comprises a switch cabinet, and a grounding switch, a contact box, and a current transformer assembled in the switch cabinet. The contact box comprises an upper contact box and a lower contact box. The connecting copper bar between the outgoing line end of the upper contact box and the main bus forms an upper branch bus, the connecting copper bar between the outgoing line end of the lower contact box and the current transformer forms a lower branch bus, the outgoing line side copper bar of the current transformer is an outgoing line bus, and the connecting copper bar between the outgoing line side of the current transformer and the static contact head of the grounding switch forms a grounding connecting bus. The upper branch bus, the lower branch bus, the outgoing line bus, and the grounding connecting bus are connected by vertically arranged copper bars. ​

[0008] Further, the upper contact box outlet terminal and the lower contact box outlet terminal are vertical outlet copper bars, the outlet copper bar of the upper contact box is connected with the main bus through the vertically arranged bus transfer copper bar; the main bus is assembled on the top of the bus chamber of the switch cabinet through the vertically downward bus insulator, the support ends of the bus insulator are provided with the blocking edges for insulation blocking; and the clamping blocks are fixedly assembled between the blocking edges to fix the main bus, and the slots are formed in the clamping blocks for the insertion of the main bus; the overlapping parts of each phase main bus and the outlet copper bar of the upper contact box are staggered arranged.

[0009] Further, the contact box comprises a box body, an outlet copper bar, the box body is provided with an assembly chamber of movable and static contacts, the box body is provided with an outlet slot in communication with the assembly chamber, and an installation plate is extended from the box body; the outlet copper bar is vertically arranged and led out from the outlet slot of the box body; the box body is provided with a pressing mechanism for pressing the outlet copper bar to the installation surface in the box body; and the inner wall of the box body is provided with a central positioning slot for the insertion of the rear end of the static contact to position the rear end of the static contact.

[0010] Further, the outlet copper bar is vertically arranged with the installation surface in the box body; the pressing mechanism comprises at least one clamping block with a positioning slot, one positioning slot is correspondingly provided for the insertion of one outlet copper bar, and a locking piece is arranged on the clamping block to lock the clamping block on the installation surface in the box body.

[0011] Further, the outer peripheral surface of the box body outside the outlet slot is provided with at least one closed loop type umbrella skirt surrounding the outlet slot.

[0012] Further, the upper part of the rear end surface of the box body is inwardly recessed to form a notch, the lower part of the rear end surface of the box body in the notch is provided with a semicircular arc blocking piece, the semicircular arc blocking piece extends outward, and an air gap is reserved between the outer peripheral surface of the semicircular arc blocking piece and the box body.

[0013] Further, the current transformer comprises a transformer body, an upwardly protruding wiring platform is formed in the middle of the top of the transformer body; two longitudinally arranged wiring stakes are assembled on the wiring platform, the outlet copper bar of the lower contact box is connected with one of the wiring stakes, and the other wiring stake is connected with the static contact of the grounding switch through the vertically arranged connecting copper bar; a connecting hole is formed in the wiring stake, vertical side blocking plates are fixedly arranged on both sides of the top of the transformer body, and vertical end blocking plates are fixedly arranged on both ends of the top of the transformer body; the side blocking plates and the end blocking plates are connected to form a closed type, and the wiring stakes are enclosed therein; heat dissipation grooves are arranged on the side surface of the wiring stake along the height direction of the wiring stake for natural ventilation.

[0014] Further, the grounding switch comprises a moving contact, a static contact assembly, and a control mechanism for operating the moving contact; the static contact assembly comprises a copper bar type static contact, a clamping mechanism, and an insulator, the front end of the insulator is provided with an assembly surface; the copper bar type static contact is vertically arranged between the middle part and the assembly surface; the upper end of the copper bar type static contact extends upward and is matched with the moving contact, and the lower end extends downward and is used as a connecting end connected with the current transformer; the clamping mechanism assembles the copper bar type static contact on the assembly surface of the front end of the insulator from the middle part of the copper bar type static contact.

[0015] Further, the clamping mechanism comprises a clamping block, a connecting piece, and a positioning pin; the inner side of the clamping block is a clamping surface matched with the assembly surface of the insulator, a slot is formed in the clamping block and used for longitudinally inserting the copper bar type static contact, the slot extends to the clamping surface of the inner side of the clamping block; after the copper bar type static contact is inserted into the slot, the copper bar type static contact is compressed between the slot bottom surface of the slot and the assembly surface of the front end of the insulator; the positioning pin is clamped in the clamping block and transversely passes through the copper bar type static contact; the front end of the connecting piece transversely passes through the clamping block from the outer side of the clamping block and vertically enters the assembly surface, so as to form a lock by matching the clamping surface of the clamping block with the assembly surface of the front end of the insulator.

[0016] Further, after the copper bar type static contact is inserted into the slot, the middle part of the copper bar type static contact is in clearance fit between the outer wall of the middle part and the side wall of the slot.

[0017] By using the above technical scheme, the copper bars arranged in a vertical manner are respectively used to connect the outgoing line end of the upper contact box and the main bus, the outgoing line end of the lower contact box and the current transformer, and the current transformer and the static contact of the grounding switch, so that the cabinet size of the switch device is unchanged, the width is still 1400 mm, the copper bars are shaped by vertical bending processing technology for wiring, the three-phase copper bars are vertically and parallel arranged in the cabinet, the overlapping parts are staggered to avoid, the special bus supporting insulator with a baffle (the baffle plays an insulating isolation role) is used to fix the copper bars with the clamping block, and the copper bars are fixed without punching; due to the vertical arrangement, the bare copper bars do not need to be sleeved with heat-shrinkable sleeves and do not need to be additionally installed with insulating partitions, the structure in the cabinet is relatively optimized, the processing technology is simplified, the installation is convenient and fast, the copper bars are fixed reliably, the vertical copper bars are better in heat dissipation than the flat copper bars, and the phase-to-phase and phase-to-ground air clearances in the cabinet can still reach more than 310 mm, which fully meets the requirements of State Grid Corporation of China. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic view of the internal structure of an existing switch device;

[0019] Figure 2 FIG. 2 is a schematic view of the internal structure of the switch device of the present application;

[0020] Figure 3 FIG. 3 is a schematic view of the structure of the contact box in the present application;

[0021] Figure 4 Fig. 2 is a schematic view of the internal structure of the contact box in the present application;

[0022] Figure 5 Fig. 3 is a schematic view of the top structure of the contact box in the present application;

[0023] Figure 6 Fig. 4 is a schematic view of the structure of the current transformer in the present application; Figure 5 Fig. 5 is a schematic view of the right structure of the current transformer in the present application;

[0024] Figure 7 Fig. 6 is a schematic view of the structure of the grounding switch in the present application;

[0025] Figure 8 Fig. 7 is a schematic view of the left structure of the grounding switch in the present application; Figure 7 Fig. 8 is a schematic view of the side structure of the grounding switch in the present application;

[0026] Figure 9 Fig. 9 is a schematic view of the top structure of the grounding switch in the present application; Figure 7 Fig. 10 is a schematic view of the structure of the grounding switch insulator in the present application;

[0027] Figure 10 Fig. 11 is a schematic view of the structure of the grounding switch insulator in the present application;

[0028] Figure 11 Fig. 12 is a schematic view of the left structure of the grounding switch insulator in the present application; Figure 10 Fig. 13 is a schematic view of the side structure of the grounding switch insulator in the present application;

[0029] Figure 12 Fig. 14 is a schematic view of the top structure of the grounding switch insulator in the present application; Figure 11 Fig. 15 is a schematic view of the structure of the grounding switch insulator in the present application;

[0030] In the drawings, 1 is a switch cabinet, 2 is a grounding switch, 301 is an upper contact box, 302 is a lower contact box, 4 is a current transformer, 5 is a copper bar, 6 is an outgoing copper bar, 7 is a busbar transfer copper bar, 8 is a main busbar, 9 is a busbar insulator, 10 is a baffle, 11 is a clamping block, 12 is a slot, 13 is a box body, 14 is an assembly chamber, 15 is an outgoing slot, 16 is a mounting plate, 17 is an upper mounting position, 18 is a lower mounting position, 19 is an inner mounting surface, 20 is a positioning groove, 21 is a clamping block, 22 is a locking piece, 23 is a static contact, 24 is a central positioning groove, 25 is a moving contact, 26 is a dynamic and static contact engagement position, 27 is a closed loop umbrella skirt, 28 is a radial rib, 29 is an axial rib, 30 is a notch, 31 is a semicircular arc baffle, 32 is an air gap, 33 is a transverse convex rib, 34 is a transformer body, 35 is a wiring platform, 36 is a wiring pile head, 37 is a connecting copper bar, 38 is a connecting hole, 39 is a heat dissipation groove, 40 is a first side baffle, 41 is a second side baffle, 42 is a first end baffle, 43 is a second end baffle, 44 is a product nameplate carving or pasting position, 45 is a moving cutter head, 46 is a static cutter head assembly, 47 is an operating mechanism, 48 is a copper bar type static cutter head, 49 is an insulator, 50 is an assembly surface, 51 is a clamping block, 52 is a connecting piece, 53 is a positioning pin, 54 is a clamping surface, 55 is a insertion slot, 56 is an assembly hole, 57 is a counterbore, 58 is an insertion slot, 59 is a baffle. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0032] Reference Figures 1-12 As shown in the drawings, the vertical copper bar metal enclosed high-voltage switchgear includes a switch cabinet 1, and a grounding switch 2, a contact box, and a current transformer 4 assembled in the switch cabinet. The contact box includes an upper contact box 301 and a lower contact box 302. The upper contact box and the lower contact box are structurally identical, and are installed in different positions and directions in the switch cabinet.

[0033] The connection copper bars between the outgoing terminal of the upper contact box and the main bus form an upper branch bus, the connection copper bars between the outgoing terminal of the lower contact box and the current transformer form a lower branch bus, the outgoing side copper bar of the current transformer is an outgoing bus, and the connection copper bars between the outgoing side of the current transformer and the static head of the grounding switch form a grounding connection bus; the upper branch bus, the lower branch bus, the outgoing bus and the grounding connection bus are connected by vertically arranged copper bars 5; the copper bars connected by adjacent main buses are arranged in parallel to ensure consistent phase-to-phase distance and meet the requirement of safety distance.

[0034] The outgoing terminal of the upper contact box and the outgoing terminal of the lower contact box are vertically arranged outgoing copper bars 6, the outgoing copper bar of the upper contact box is connected with the main bus 8 through a vertically arranged bus transfer copper bar 7, the bus transfer copper bar can be a single copper bar or a double copper bar according to the current requirement; the outgoing copper bar of the upper contact box is arranged upward and connected with the double copper bar of the corresponding main bus, and the outgoing copper bar of the lower contact box is arranged downward and connected with the current transformer; the outgoing copper bars of the three-phase upper contact boxes and the double copper bars are arranged in parallel to ensure the safety distance between phases.

[0035] The main bus is assembled at the top of the bus chamber of the switch cabinet through a vertically downward bus insulator 9, which saves the internal space of the switch cabinet and facilitates wiring; the support end of the bus insulator is provided with an insulating blocking flange 10; the upper end of the bus transfer copper bar is connected with the main bus in the flange through a clamping block 11, the clamping block is an insulating block with a notch 12, the notch clamps the upper end of the bus transfer copper bar and the main bus, the insulating block is connected with the lower end of the insulator through screws on both sides, and the copper bar does not need to be punched; the lower end of the bus transfer copper bar is connected with the outgoing copper bar of the upper contact box. The overlapping parts of the main bus of each phase and the outgoing copper bar of the upper contact box connected therewith are arranged staggered, which facilitates wiring and improves safety.

[0036] By using vertically arranged copper bars to connect the upper contact box outlet and the main busbar, the lower contact box outlet and the current transformer, and the current transformer and the static blade of the grounding switch, the size of the switch cabinet remains unchanged and the width remains 1400mm. The copper bars are formed by vertical bending processing technology for wiring. The three-phase copper bars in the cabinet are arranged vertically and in parallel, with staggered overlaps. Special busbar support insulators with ribs (ribs serve as insulation isolation) are used and matched with clamps for fixing. The copper busbars are fixed without drilling; due to the vertical layout, the bare copper busbars do not require heat shrink tubing or insulating partitions, resulting in a relatively optimized structure within the switchgear. The processing is simplified, installation is convenient and quick, and the busbars are reliably fixed. Vertical copper busbars dissipate heat better than flat ones. When 80*10 double-piece copper busbars are used for busbar transfer, the maximum current can reach 2500A. The phase-to-phase and phase-to-ground net air insulation distance within the switchgear can still reach over 310mm, fully meeting the requirements of the State Grid Corporation of China. Due to the change in wiring method, the current transformer can be installed at the bottom of the switchgear instead of in the center, which facilitates wiring and clearance.

[0037] See also Figures 3-6 As shown, the contact box includes a box body 13, an outlet copper bus 6, an assembly chamber 14 for the moving and static contacts inside the box body, a wire outlet slot 15 connected to the assembly chamber, and a mounting plate 16 extending from the box body; the upper end of the mounting plate is an upper mounting position 17, and the lower end is a lower mounting position 18, so as to facilitate the assembly of the contact box into the switch cabinet.

[0038] The outgoing copper bar is arranged longitudinally and led out from the outlet groove of the box body; Figure 4 As shown, the outgoing copper bus is arranged vertically, and the displayed outgoing copper bus is the width, which is led out from the outgoing wire slot. The corresponding outgoing wire slot is designed to be enlarged to facilitate the installation of subsequent components and observation of the internal components of the contact box.

[0039] The box body is equipped with a clamping mechanism that presses the outgoing copper busbar against the mounting surface 19 of the box body. The clamping mechanism includes a clamping block 21 with two locating slots 20, which are spaced apart. Each slot accommodates a corresponding outgoing copper busbar. Inserting the outgoing copper busbar into the locating slots clamps the outgoing copper busbar. The width of the locating slots is slightly larger than the thickness of the outgoing copper busbar, as long as the outgoing copper busbar can be snapped into the locating slots. A locking member 22, which locks the clamping block to the mounting surface of the box body, is a screw. Through holes are provided on both sides of the clamping block for the screws to pass through and screw into the mounting surface of the box body to lock the clamping block. The lower end of the outgoing copper busbar is fixedly connected to the rear end of the static contact 23 by bolts.

[0040] The inner wall of the box body is provided with a central positioning groove 24 for inserting the rear end of the static contact to position the rear end of the static contact. During assembly, the rear end of the static contact is inserted into the central positioning groove to limit the radial movement of the static contact in the contact box, achieving precise positioning. The central positioning groove is adapted to the shape of the rear end of the static contact, and preferably, the rear end of the static contact is in the form of a sheet, and the central positioning groove is in the form of a flat groove adapted to the sheet-shaped rear end of the static contact.

[0041] The outgoing copper bar is vertically arranged with the mounting surface in the box body, that is, the outgoing copper bar is longitudinally led out from the contact box through the outgoing slot; the outgoing slot is a rectangular, circular or polygonal slot opening visible from the outside of the box body to the contact engagement position of the movable and static contacts inside the box body; specifically, the outgoing slot extends above the contact engagement position 26 of the movable contact 25 and the static contact 23 inside the contact box, so as to clearly see the contact engagement position from the outside and facilitate the operation of the assembly aid extending into the contact box from the outgoing slot during later assembly. Due to the increase of the outgoing slot, the static contact and the copper bar can be conveniently installed in the front cabinet and the rear cabinet of the switch cabinet (originally only installed in the front cabinet and required special tools), the contact engagement of the movable and static contacts can be clearly seen at the outgoing slot (originally not visible), and since the movable and static contacts generate a large amount of heat, the movable and static contacts are exposed at the outgoing slot, and heat dissipation is better.

[0042] In order to meet the safety of the contact box and ensure the surface creepage distance, at least one closed loop umbrella skirt 27 is arranged on the outer peripheral surface of the box body outside the outgoing slot to surround the outgoing slot. The number of closed loop umbrella skirts is set according to the height and required creepage distance. The closed loop umbrella skirt includes radial ribs 28 arranged along the diameter direction of the box body and axial ribs 29 arranged along the axial direction of the box body, and the radial ribs and the axial ribs are connected to form a closed loop. Meanwhile, a notch 30 is formed by inwardly recessing the upper part of the rear end surface of the box body, thereby increasing the creepage distance. Further, a semicircular arc baffle 31 is arranged at the lower part of the notch on the rear end surface of the box body, the semicircular arc baffle extends outward, and an air gap 32 is reserved between the outer peripheral surface of the semicircular arc baffle and the box body. A transverse convex rib 33 is arranged below the rear part of the box body along the radial direction of the box body. The umbrella skirt, the notch, the gap and the transverse convex rib are designed to ensure that the surface creepage distance in each direction of the contact box meets the requirements.

[0043] The contact box is arranged in a longitudinal manner from the outgoing copper bar in the outgoing slot, that is, the outgoing copper bar is arranged in a vertical manner from the original horizontal slot, according to the safety requirement between the outgoing copper bar and the outgoing slot, the size of the outgoing slot is correspondingly expanded, after the outgoing copper bar is arranged in a vertical manner, the lapping between the vertical copper bars in the switch cabinet is facilitated, and no additional switching copper bar is needed; the outgoing slot is correspondingly expanded, the engagement position of the movable contact and the static contact in the contact box can be clearly seen, and the movable contact and the static contact are facilitated to dissipate heat, and meanwhile, the outgoing slot can be used for auxiliary installation during installation, so that the internal components of the contact box can be flexibly installed, and the applicability is enhanced; the center positioning slot is formed on the mounting surface in the contact box, the rear end of the static contact is inserted into the center positioning slot, so that the radial movement of the static contact in the contact box is limited, the outgoing copper bar is fixedly installed on the mounting surface in the contact box through the pressing mechanism, and is fixedly connected with the rear end of the static contact, so that stable connection is realized. The vertical outgoing copper bar meets the installation requirement of the vertical copper bar in the switch cabinet, meanwhile, the opening of the outgoing slot is increased under the premise of ensuring the air insulation distance and the surface creepage distance, so that the outgoing slot is facilitated to be assembled later, the engagement of the movable contact and the static contact in the contact box is facilitated to be seen, and the heat dissipation of the engagement contact part is facilitated.

[0044] Referring to Figures 7-9 As shown in the figure, the current transformer includes a transformer body 34, the top middle part of the transformer body is upwardly raised to form a wiring platform 35, and the top surface of the wiring platform is a plane. Two wiring stakes 36 are arranged in a longitudinal manner on the wiring platform, the lower ends of the wiring stakes extend into the transformer and are connected with internal devices of the transformer, the outgoing copper bar of the lower contact box is connected with one of the wiring stakes, and the other wiring stake is connected with the static contact of the grounding switch through a vertically arranged connecting copper bar 37.

[0045] Two or four connecting holes 38 are formed in the top part of the wiring stake exposed above the wiring platform, and connecting members are respectively arranged in the connecting holes, so that the wiring stake is fixedly connected with one end of the connecting copper bar.

[0046] Vertical side baffles are respectively arranged at the two sides of the top part of the transformer body, and vertical end baffles are respectively arranged at the two ends of the top part of the transformer body; the side baffles and the end baffles are connected to form a closed type, so as to enclose the wiring stakes; the vertical arrangement of the end baffles reduces the length space occupied by the transformer in the switch cabinet, and increases the creepage distance to ground, so as to meet the safety requirement. Due to the longitudinal arrangement of the wiring stakes, in addition to meeting the wiring of the vertical copper bar in the switch cabinet, the heat generated in the transformer can be better diffused to the outside, so as to improve the heat dissipation performance of the transformer.

[0047] In order to enable the mutual inductor to obtain better heat dissipation capacity, a heat dissipation groove 39 for natural ventilation is provided on the side of the terminal post and arranged along the height direction of the terminal post. That is, when the air flows, cold air can enter the heat dissipation groove from the bottom, and the hot air is discharged upward to take away the heat in the terminal post.

[0048] The side baffles herein include a first side baffle 40 fixedly mounted on one side of the top surface of the transformer body, and a second side baffle 41 fixedly mounted on the other side of the top surface of the transformer body. The first and second side baffles extend upward from the sides of the top surface of the transformer body, i.e., the two side baffles are integrally formed with the transformer body. To ensure that the transformer's wiring connection meets safety performance requirements, the height of the first and second side baffles is higher than the height of the wiring terminal head, and the first and second side baffles are of the same height.

[0049] The end baffles include a first end baffle 42 fixed to one end of the transformer's top surface and a second end baffle 43 fixed to the other end of the transformer's top surface. The first and second end baffles extend upward from the ends of the transformer's top surface, forming a single piece with the transformer. To ensure creepage distance, the first and second end baffles are lower than the terminal studs and are the same height.

[0050] The end baffles and side baffles shown in the drawings of the present application are straight plate type. Of course, in order to obtain a better creepage distance and further reduce the space occupied by the transformer, they can also be set to an undulating wave type.

[0051] In this application, the terminal post is a copper busbar arranged longitudinally on the terminal platform. The heat dissipation groove extends from the position where the terminal post is exposed from the terminal platform to the top of the terminal post. The heat dissipation groove 39 is arranged on one or both sides of the copper busbar to allow the flowing air to better remove the heat in the terminal post and diffuse it outward; the cross-sectional shape of the heat dissipation groove can be semicircular, rectangular or other shapes; the outer wall of the end baffle is the product nameplate engraving or posting area 44. Due to the setting of the end baffle in this application, the nameplate can be moved from the bottom of the side of the transformer to a conspicuous position on the top of the transformer body, making it easier to view the nameplate parameters.

[0052] The current transformer structure can reduce the length direction space occupation of the current transformer, so that the internal arrangement of the switch cabinet is more optimized, and the safe creepage distance can be met; the longitudinal arrangement of the terminal post head can meet the wiring requirements of the vertical copper bar in the switch cabinet, and can also quickly transfer the heat generated in the current transformer to the outside for diffusion, further, the heat dissipation groove adopts the heat pipe convection heat dissipation principle, so that the hot air is quickly discharged upward to carry away the heat and improve the heat dissipation capacity of the current transformer; the nameplate is moved from the bottom of the current transformer to the obvious position at the top of the current transformer body, so that the nameplate parameters can be easily viewed, and the current transformer has the advantages of small space occupation, high heat dissipation capacity and convenient wiring.

[0053] Referring to Figures 10-12 As shown in the figure, the grounding switch 2 includes a moving knife head 45, a static knife head assembly 46, and an operating mechanism 47 for operating the moving knife head and cooperating with the static knife head assembly. The operating mechanism uses the previous mechanism, which will not be described in detail here.

[0054] The static knife head assembly includes a copper bar type static knife head 48, i.e. the static knife head in the present application is made of a copper bar; a clamping mechanism for assembling the copper bar type static knife head to the assembling surface of the insulator, after assembly, the copper bar type static knife head is limited in the horizontal and vertical directions and cannot act; and an insulator 49, the front end of the insulator is provided with a vertical assembling surface 50 for assembling the static knife head.

[0055] The copper bar type static knife head is vertically arranged between the assembling surface, the copper bar type static knife head is vertically arranged, and then the plane where the copper bar type static knife head is located is vertically arranged with the assembling surface to meet the vertical wiring of the copper bar in the high-voltage switch cabinet; the upper end of the copper bar type static knife head extends upward as a cooperating position with the moving knife head 45 of the grounding switch, and the lower end extends downward as a connecting end for connecting with the connecting copper bar 37; the clamping mechanism assembles the copper bar type static knife head on the front end assembling surface of the insulator 49 from the middle of the copper bar type static knife head.

[0056] Specifically, the clamping mechanism includes a clamping block 51, a connecting piece 52, and a positioning pin 53; the clamping block is an insulating clamping block made of insulating material, the inner side of the clamping block is a clamping surface 54 for cooperating with the assembling surface of the insulator, and a slot 55 is provided on the clamping block for longitudinally inserting the copper bar type static knife head, the slot extends to the clamping surface on the inner side of the clamping block to facilitate the insertion of the copper bar type static knife head; after the copper bar type static knife head is inserted into the slot, the copper bar type static knife head is pressed between the slot bottom surface and the front end assembling surface of the insulator, i.e. the two side surfaces of the copper bar type static knife head are pressed between the slot bottom surface and the assembling surface, and after being locked by the connecting piece, the copper bar type static knife head is assembled and limited by the slot, so that it cannot act in the horizontal direction. The positioning pin is clamped in the clamping block, and the positioning pin transversely passes through the copper bar type static knife head, so that the copper bar type static knife head cannot act longitudinally.

[0057] The connecting member is a screw, the front end of the connecting member transversely passes through the clamping block from the outside of the clamping block and vertically enters the assembly surface to form locking by fitting between the clamping surface of the clamping block and the assembly surface of the front end of the insulator. Assembly holes 56 are respectively formed on both sides of the clamping block, a screw is arranged in one of the assembly holes, and a counterbore 57 is formed on the outside of the clamping block and communicates with the assembly hole, so that the rear end of the screw is arranged in the counterbore, thereby avoiding the insulation risk caused by the exposure of the screw nut.

[0058] After the copper bar type static knife head is inserted into the slot, the copper bar type static knife head is in clearance fit between the middle outer wall in the slot and the side wall of the slot, so that the copper bar type static knife head has a certain amount of free movement in the transverse direction, so as to facilitate the alignment and close contact of the upper end of the copper bar type static knife head and the moving knife head. The clamping surface of the clamping block is provided with an insertion groove 58 for the positioning pin, the two ends of the insertion groove do not extend to the side surface of the clamping block, the length of the insertion groove is greater than the thickness of the copper bar type static knife head but less than the width of the clamping block, a hole is formed on the copper bar type static knife head for the positioning pin to pass through, and then the positioning pin is inserted into the insertion groove to realize the longitudinal limitation of the copper bar type static knife head; the middle part of the insertion groove communicates with the slot, and the insertion groove and the slot are vertically arranged. The assembly surface of the insulator extends outwardly to form a stop edge 59 on both sides, and the clamping mechanism is located between the stop edges to improve the reliability of the interphase insulation. During assembly, the positioning pin is first inserted into the hole of the copper bar type static knife head, then the positioning pin is aligned with the insertion groove, the copper bar type static knife head is aligned with the slot, and they are inserted together, then the screw is inserted into the corresponding assembly hole and screwed into the assembly surface to clamp.

[0059] In the above-mentioned grounding switch, the current special-shaped static knife head structure is replaced by the copper bar type static knife head, the interphase air insulation distance meets the requirements, and there is no need to additionally arrange an interphase insulation partition plate. Moreover, the copper bar type structure is more convenient to manufacture than the special shape, and the middle part of the copper bar type static knife head is clamped in the front end of the insulator by the special clamping mechanism, which is convenient for assembly. Due to the copper bar type structure, the upper end of the copper bar type static knife head is extended and used as a matching end with the moving knife head. Since the copper bar is extended by a certain length, it has a certain elastic swing, so that when the copper bar type static knife head is matched with the moving knife head, the static knife head can automatically align and match with the moving knife head, and the contact and matching of the two are more close and reliable.

Claims

1. Vertical copper bar metal enclosed high-voltage switchgear, including switch cabinet, and grounding switch, contact box, and current transformer assembled in the switch cabinet. The contact box includes an upper contact box and a lower contact box, characterized in that: The connecting copper bar between the outgoing end of the upper contact box and the main busbar constitutes the upper branch busbar, the connecting copper bar between the outgoing end of the lower contact box and the current transformer constitutes the lower branch busbar, the copper bar on the outgoing side of the current transformer is the outgoing busbar, and the connecting copper bar between the outgoing side of the current transformer and the static blade of the grounding switch constitutes the grounding connection busbar; the upper branch busbar, the lower branch busbar, the outgoing busbar, and the grounding connection busbar are connected by vertically arranged copper bars respectively; the contact box includes a box body and an outgoing copper bar, and the box body is an assembly chamber for the moving and static contacts, and the box body is provided with an assembly chamber The chamber forms a connected wire outlet groove, and a mounting plate extends from the box body; the wire copper bar is arranged longitudinally and led out from the wire outlet groove of the box body; a pressing mechanism is provided in the box body to press the wire copper bar against the mounting surface inside the box body; a central positioning groove is provided on the inner wall of the box body for the rear end of the static contact to be inserted to form a positioning for the rear end of the static contact; the wire copper bar is arranged vertically to the mounting surface inside the box body, that is, the wire copper bar is longitudinally led out from the contact box through the wire outlet groove; the wire outlet groove is a rectangular, circular or polygonal notch through which the engagement position of the moving and static contacts can be seen from the outside of the box body to the inside of the box body.

2. The vertical copper busbar metal-enclosed high-voltage switchgear according to claim 1, characterized in that: The outgoing terminals of the upper and lower contact boxes are vertically led-out copper bars. The outgoing copper bars of the upper contact box are connected to the main busbars through vertically arranged busbar transfer copper bars. The main busbars are assembled on the top of the busbar chamber of the switch cabinet through vertically downward busbar insulators. Both sides of the supporting ends of the busbar insulators are provided with insulating ribs for shielding. The main busbars are fixedly assembled in clamps between the ribs, and the clamps are provided with slots for inserting the main busbars. The overlaps between the main busbars of each phase and the outgoing copper bars of the upper contact boxes to which they are connected are staggered.

3. The vertical copper busbar metal-enclosed high-voltage switchgear according to claim 1, characterized in that: The outgoing copper busbar is arranged vertically to the mounting surface in the box body; the pressing mechanism includes a clamping block with at least one positioning groove, one positioning groove corresponding to one outgoing copper busbar being inserted, and a locking piece for locking the clamping block to the mounting surface in the box body.

4. The vertical copper busbar metal-enclosed high-voltage switchgear according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the box body outside the wire outlet groove is provided with at least one circle of closed-loop umbrella skirt surrounding the wire outlet groove.

5. The vertical copper busbar metal-enclosed high-voltage switchgear according to any one of claims 1 to 3, characterized in that: The upper portion of the rear end surface outside the box body is concave inward to form a notch; a semicircular baffle is arranged at the lower portion of the rear end surface outside the box body at the notch, and the semicircular baffle extends outward, with an air gap retained between the outer circumference of the semicircular baffle and the box body.

6. The vertical copper bar metal-enclosed high-voltage switchgear according to any one of claims 1 to 3, characterized in that: The current transformer includes a transformer body, and the middle part of the top of the transformer body bulges upward to form a wiring platform; two longitudinally arranged wiring piles are installed on the wiring platform, the outgoing copper busbar of the lower contact box is connected to one of the wiring piles, and the other wiring pile is connected to the static knife head of the grounding switch through a vertically arranged connecting copper busbar; a connection hole is opened on the wiring pile, and vertically arranged side baffles are fixedly provided on both sides of the top of the transformer body, and vertically arranged end baffles are fixedly provided on both ends of the top of the transformer body; the side baffles and the end baffles are connected to form a closed type, enclosing the wiring pile head therein; a heat dissipation groove for natural ventilation is arranged on the side of the wiring pile head and is arranged along the height direction of the wiring pile head.

7. The vertical copper busbar metal-enclosed high-voltage switchgear according to any one of claims 1 to 3, characterized in that: The grounding switch includes a movable blade head, a stationary blade head assembly, and an operating mechanism for operating the movable blade head; the stationary blade head assembly includes a copper bar type stationary blade head, a clamping mechanism, and an insulator, and the front end of the insulator is provided with a mounting surface; the copper bar type stationary blade head is arranged vertically between the middle part and the mounting surface; the upper end of the copper bar type stationary blade head extends upward to cooperate with the movable blade head, and the lower end extends downward to serve as a connection end for connecting to the current transformer; the clamping mechanism mounts the copper bar type stationary blade head on the mounting surface of the front end of the insulator from the middle part of the copper bar type stationary blade head.

8. The vertical copper busbar metal-enclosed high-voltage switchgear according to claim 7, characterized in that: The clamping mechanism includes a clamping block, a connecting piece, and a positioning pin; the inner side of the clamping block is a clamping surface that cooperates with the assembly surface of the insulator, and the clamping block is provided with a slot for the copper bar type static blade head to be longitudinally inserted, and the slot extends to the clamping surface inside the clamping block; after the copper bar type static blade head is inserted into the slot, the copper bar type static blade head is pressed between the bottom surface of the slot and the front end assembly surface of the insulator; the positioning pin is clamped in the clamping block, and the positioning pin passes through the copper bar type static blade head horizontally; the front end of the connecting piece passes through the clamping block horizontally from the outside of the clamping block, and vertically enters the assembly surface, so as to fit the clamping surface of the clamping block and the front end assembly surface of the insulator to form a lock.

9. The vertical copper busbar metal-enclosed high-voltage switchgear according to any one of claims 7 to 8, characterized in that: After the copper bar type static blade head is inserted into the slot, a clearance fit is formed between the outer wall of the middle portion of the copper bar type static blade head in the slot and the side walls of the slot.

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