High-voltage switch cabinet

Abstract

The invention relates to the field of general parts of switch equipment, in particular to a high-voltage switch cabinet. The high-voltage switch cabinet comprises a primary current-carrying bus and a straight-through current transformer arranged on the primary current-carrying bus in a matched mode, the straight-through current transformer comprises a high-voltage shielding net arranged on an annular inner cavity of the straight-through current transformer, and the high-voltage shielding net is connected with the primary current-carrying bus through an electric connection structure. The electric connection structure is an elastic conductive contact which is fixedly installed on the primary current-carrying bus and extends towards the high-voltage shielding net. Compared with an equipotential connecting flexible wire in a comparison file, the elastic conductive contact structure is easier to install, more complex wiring and fixing operations of the equipotential flexible wire are avoided, and meanwhile, the problems that the insulation distance is shortened and the equipotential flexible wire is easy to pull apart due to coiling arrangement of the equipotential flexible wire are solved.

Description

Technical Field

[0001] The present invention relates to the field of general parts of switchgear, and in particular to a high-voltage switch cabinet. Background Art

[0002] In the high-voltage switchgear, the through-type current transformer is installed on the primary current-carrying busbar in the switchgear. It uses the principle of electromagnetic induction to convert high current into low current in proportion, thereby realizing the monitoring and protection of the primary circuit by the secondary side of the switchgear. A high-voltage shielding net is provided on the inner wall of the annular inner cavity of the through-type current transformer. In order to eliminate corona discharge and to improve the insulation performance between the secondary winding and the primary current-carrying busbar, the high-voltage shielding net of the through-type current transformer is connected to the primary current-carrying busbar with equal potential.

[0003] The Chinese utility model with authorization announcement number CN216119871U and authorization announcement date 2022 / 03 / 22 discloses a through-type current transformer, which includes a high-voltage shielding mesh arranged on the inner wall of the annular inner cavity and an equipotential soft wire connected to the high-voltage shielding mesh, and the high-voltage shielding mesh is provided with a threaded hole, one end of the equipotential soft wire is connected to the threaded hole on the high-voltage shielding mesh by a screw, and the other end of the equipotential soft wire is connected to the threaded hole on the primary current-carrying bus in the switch cabinet by a screw.

[0004] Because the equipotential soft wire is easy to deform, when the distance between the equipotential connection point on the transformer high-voltage shielding net and the equipotential connection point on the primary current-carrying busbar is close, the equipotential soft wire may bend. Because the primary current-carrying busbar connected to one end of the equipotential soft wire is a high-voltage current-carrying conductor, the equipotential soft wire may bend between the two equipotential connection points. The insulation distance of the primary high-voltage current-carrying busbar may be shortened, thereby causing the hidden danger of insufficient insulation between the primary high-voltage current-carrying busbar and the ground. In addition, during the installation and transportation process, the equipotential soft wire is easy to be torn off, and it is difficult to repair or replace the equipotential soft wire. Summary of the invention

[0005] The object of the present invention is to provide a high-voltage switch cabinet to solve the problem that the equipotential soft wire connecting the through-type current transformer and the primary current-carrying bus in the existing switch cabinet is easy to be twisted and torn.

[0006] To achieve the above object, a high voltage switch cabinet of the present invention adopts the following technical solution: A high-voltage switch cabinet includes a primary current-carrying busbar and a through-type current transformer mounted on the primary current-carrying busbar, wherein the through-type current transformer includes a high-voltage shielding net arranged in its inner cavity, and the high-voltage shielding net is connected to the primary current-carrying busbar through an electrical connection structure, wherein the electrical connection structure is an elastic conductive contact fixedly mounted on the primary current-carrying busbar and extending toward the high-voltage shielding net.

[0007] Furthermore, the elastic conductive contact includes a fixed seat fixedly mounted on the primary current-carrying busbar and a floating contact guided and movably mounted on the fixed seat. A spring is provided between the fixed seat and the floating contact to make the floating contact abut against the high-voltage shielding net. The fixed seat is provided with an anti-detachment structure to prevent the floating contact from detaching. The fixed seat and the floating contact are electrically connected.

[0008] Furthermore, the fixing seat is adjustably mounted on the primary current-carrying busbar in the radial direction of the inner cavity of the through-type current transformer.

[0009] Furthermore, the fixing seat is provided with a fixing thread section, and the primary current-carrying busbar is provided with a fixing thread hole, and the fixing seat is installed on the primary current-carrying busbar through a threaded connection between the fixing thread section and the fixing thread hole.

[0010] Furthermore, the fixed seat includes a tubular base, a fixed threaded section is arranged at one end of the tubular base, the other end of the tubular base is connected to a limiting sleeve, the floating contact is movably inserted in the tubular base, an outer convex edge is provided on the floating contact, the anti-slip structure is an inner stop edge arranged on the limiting sleeve for cooperating with the outer convex edge, and a spring is arranged between the fixed seat and the outer convex edge.

[0011] Furthermore, the inner hole surrounded by the inner stopper of the limiting sleeve cooperates with the floating contact guide.

[0012] Furthermore, the tubular base is threadedly connected to the limiting sleeve.

[0013] Furthermore, there are more than two elastic conductive contacts, which are arranged axially at intervals along the primary current-carrying conductor.

[0014] Furthermore, there are two elastic conductive contacts, which are respectively arranged near two ends of the high-voltage shielding net.

[0015] Furthermore, the through-type current transformer also includes a low-voltage shielding net arranged on the outer ring surface of the secondary winding, and the low-voltage shielding net is used to balance the electric field around the secondary winding.

[0016] Beneficial effects: The high-voltage switchgear of the present invention is an improved invention. Specifically, the present invention sets the electrical connection structure between the high-voltage shielding net of the through-type current transformer in the high-voltage switchgear and the primary current-carrying busbar as an elastic conductive contact. Compared with the equipotential connection cord in the reference document, the elastic conductive contact structure is easier to install, avoiding the more complicated wiring and fixing operation of the equipotential cord, and also solving the problem that the equipotential cord is easy to be twisted and torn. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a high-voltage switchgear of the present invention; Figure 2 for Figure 1A cross-sectional view of a through-type current transformer mounted on a primary current-carrying busbar in a direction parallel to the primary current-carrying busbar; Figure 3 for Figure 1 A cross-sectional view of a through-type current transformer mounted on a primary current-carrying busbar in a direction perpendicular to the primary current-carrying busbar; Figure 4 for Figure 1 Schematic diagram of the structure of the medium tube type current-carrying busbar; Figure 5 for Figure 1 Schematic diagram of the structure of the elastic crimping contact structure.

[0018] In the figure: 1. high-voltage switchgear; 12. bottom plate; 13. insulated contact box; 14. extended busbar; 2. through-type current transformer; 21. annular inner cavity; 22. secondary winding; 23. high-voltage shielding net; 24. low-voltage shielding net; 25. secondary outlet terminal; 26. anchor mounting plate; 3. primary current-carrying busbar; 32. fixed threaded hole; 33. annular connecting end face; 4. elastic conductive contact; 41. floating contact; 410. outer convex edge; 42. limit sleeve; 420. inner stop edge; 43; spring; 45. fixing seat; 451. fixed threaded section; 452. tubular base. DETAILED DESCRIPTION

[0019] The present invention realizes equipotential connection between the high-voltage shielding net of the through-type current transformer in the switch cabinet and the primary current-carrying busbar through elastic crimping contacts, thereby avoiding the need to consider the fixing and wiring of the soft wire when using the equipotential soft wire connection in the comparative document, and also avoiding the insulation problem between the primary current-carrying busbar and the ground due to the bending of the soft wire.

[0020] Based on the above concept, Figure 1 As shown, the high-voltage switch cabinet 1 of the present invention includes a primary current-carrying busbar 3 and a through-type current transformer 2 sleeved on the primary current-carrying busbar 3, and the primary current-carrying busbar 3 passes through the annular inner cavity 21 of the through-type current transformer 2 from LI to L2 to act as a primary winding. The through-type current transformer 2 and the primary current-carrying busbar 3 are arranged inside the high-voltage switch cabinet 1. Three through-type current transformers 2 and primary current-carrying busbars 3 are provided, which are arranged in parallel inside the high-voltage switch cabinet 1 and a certain interval is set between each other. One end of the primary current-carrying busbar 3 is connected to the current-carrying contact fixed in the insulating contact box 13 configured in the high-voltage switch cabinet 1, and the other end passes through the through-type current transformer 2 and is connected to the rear extension busbar 14. The ground mounting plate 26 of the through-type current transformer 2 is fixedly connected to the bottom plate 12 of the high-voltage switch cabinet 1, and the through-type transformer 2 adopts a floor-standing mounting structure.

[0021] like Figure 2-3As shown, the through-type current transformer 2 includes an annular secondary winding 22 encapsulated by epoxy resin material and a high-voltage shielding net 23 arranged on the annular inner cavity 21 of the secondary winding. The secondary outlet terminal 25 of the secondary winding 22 passes through the internal components of the through-type current transformer 2 and the epoxy resin layer and is fixed to the terminal board area of ​​the through-type current transformer 2. The high-voltage shielding net 23 is connected to the primary current-carrying bus 31 through an electrical connection structure, and the electrical connection structure is an elastic conductive contact 4 fixedly mounted on the primary current-carrying bus 3 and extending toward the high-voltage shielding net 23. The high-voltage shielding net 23 configured for the through-type transformer 2 is connected to the primary current-carrying bus 31 passing through the annular inner cavity 21 of the transformer through the elastic conductive contact 4, so that the electric field around the annular inner cavity is uniform, the probability of high-voltage conductor breaking through the low-voltage secondary winding 22 and the epoxy layer insulation is reduced, and the safety of the transformer is improved.

[0022] When the high-voltage switch cabinet 1 is operating normally, the through-type current transformer 2 exposes the primary current-carrying conductor 3 to the air while realizing the transformer function, thereby reducing heat accumulation, diffusing the heat into the air, avoiding thermal aging of the transformer body, and avoiding the problem that the transformer body may be burned by the dynamic thermal stability current.

[0023] like Figure 4 As shown, the primary current-carrying busbar 3 in the high-voltage switch cabinet 1 is a tubular current-carrying busbar, which has the advantages of uniform electric field, large current density, low skin effect, and small power loss. At the same time, it can reduce the amount of materials used to save manufacturing costs, reduce resource consumption, and reduce energy loss during operation, and has high comprehensive environmental protection performance. An annular contact connection end face 33 is set between the tubular current-carrying busbar and the conductive circuit extension busbar 14, so that the tubular high-voltage current-carrying busbar 31 is tightly connected to the conductive circuit extension busbar 14 and the outer diameter size of the end face of the tubular high-voltage current-carrying busbar 31 remains unchanged, while realizing the convenience of connecting current-carrying buses of different structures in the high-voltage switch cabinet 1, while avoiding the defect of reduced air insulation clearance between phases of conductors in the high-voltage switch cabinet 1 caused by the flat structure connection end face of the conventional tubular conductor, resulting in reduced insulation performance.

[0024] In a preferred embodiment, Figure 4 As shown, the elastic conductive contact 4 includes a fixed seat 45 fixedly mounted on the primary current-carrying busbar 31 and a floating contact 41 guided and movably mounted on the fixed seat 45. A spring 43 is provided between the fixed seat 45 and the floating contact 41 to make the floating contact 41 abut against the high-voltage shielding net 23. The fixed seat 45 is provided with an anti-slip structure to prevent the floating contact 41 from slipping out. The fixed seat 45 is electrically connected to the floating contact 41. In other embodiments, the elastic conductive contact 4 includes a spring 43 and a spring base fixedly connected to one end of the spring 43, the spring base is fixedly connected to the primary current-carrying busbar 31, and a contact is fixedly connected to the upper end of the other end of the spring, and the spring can make the contact abut against the high-voltage shielding net 23.

[0025] The fixing seat 45 can be fixedly mounted on the primary current-carrying busbar 31 . In order to facilitate the adjustment of the distance between the elastic conductive contact 4 and the high-voltage shielding net 23 in the radial direction of the annular inner cavity, in a preferred embodiment, the fixing seat 45 can be adjustably mounted on the primary current-carrying busbar 31 .

[0026] In a preferred embodiment, in order to facilitate the replacement of the elastic conductive contact 4, a fixed threaded section 451 is provided on the fixing seat 45, and a fixed threaded hole 32 is provided on the primary current-carrying busbar. The fixing seat is threadedly connected with the fixed threaded hole 32 through the fixed threaded section 451 and is installed on the primary current-carrying busbar 31. In other embodiments, a sleeve-type telescopic seat structure can be directly provided on the fixing seat 45 and the primary current-carrying busbar, one end of the telescopic seat is fixedly connected to the primary current-carrying busbar 31, and the other end is fixedly connected to the fixing seat 45. The distance between the elastic conductive contact 4 and the high-voltage shielding net 23 is adjusted by adjusting the length of the sleeve-type telescopic seat.

[0027] like Figure 5 As shown, the fixed seat 45 includes a tubular base 452, a fixed threaded section 451 is arranged at one end of the tubular base, and the other end of the tubular base is connected to the limiting sleeve 42. The floating contact 41 is movably inserted in the tubular base 452. The floating contact 41 is provided with an outer convex edge 410. The anti-drop structure is an inner stop edge 420 arranged on the limiting sleeve 42 for stopping and cooperating with the outer convex edge 410. The inner stop edge 420 is used to stop the floating contact 41 and keep the floating contact 41 on the fixed seat 45. The spring is arranged Between the fixed seat 45 and the outer convex edge 410, when the spring pushes the floating contact 41 toward the high-voltage shielding layer, the inner stop edge 420 cooperates with the outer convex edge 410 to block the floating contact 41, so that the floating contact 41 will not jump out of the fixed base 45, and when the stop cooperation occurs, the floating contact 41 is in contact with the convex edge 410 to achieve electrical connection between the limit sleeve 42 and the floating contact 41. Since the limit sleeve 42 is fixedly connected to the fixed seat 45, electrical connection between the floating contact 41 and the fixed seat 45 can be achieved.

[0028] In order to make the floating contact 41 more stable when abutting against the high-voltage shielding net 23, it is arranged in a situation where the outlet line is inclined when abutting. Preferably, the inner stop edge 42 of the limit sleeve 42 is formed into an inner hole that can guide and cooperate with the floating contact 41, so that the floating contact 41 can maintain a vertically tight state when abutting against the high-voltage shielding net 23.

[0029] Preferably, the tubular base 452 is threadedly connected to the limiting sleeve 42. In other embodiments, the tubular base 452 can also be fixed together with the limiting sleeve by welding.

[0030] In order to achieve a better equipotential connection effect between the high-voltage shielding net 23 and the primary current-carrying busbar 31, preferably, more than two elastic conductive contacts 4 can be provided and arranged at axial intervals on the primary current-carrying conductor 31. Of course, in other embodiments, one elastic conductive contact 4 can also be provided.

[0031] In order to prevent the elastic conductive contact 41 from failing to make good contact with the high-voltage shielding net due to the inclination of the primary current-carrying conductor 31 while meeting the equipotential connection requirements, preferably, two elastic conductive contacts 41 are provided and are respectively arranged near the two ends of the high-voltage shielding net 23.

[0032] The through-type current transformer 2 also includes a low-voltage shielding net 24 arranged on the outer ring surface of the secondary winding, and the low-voltage shielding net 24 is used to balance the electric field around the secondary winding. The low-voltage shielding net 24 can effectively balance the electric field around the secondary winding and shield static electricity.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A high-voltage switchgear, comprising a primary current-carrying busbar and a through-type current transformer sleeved on the primary current-carrying busbar, wherein the through-type current transformer comprises a high-voltage shielding net arranged in its inner cavity, wherein the high-voltage shielding net is connected to the primary current-carrying busbar through an electrical connection structure, characterized in that: The electrical connection structure is an elastic conductive contact fixedly mounted on the primary current-carrying busbar and extending toward the high-voltage shielding net.

2. The high voltage switch cabinet according to claim 1, characterized in that: The elastic conductive contact includes a fixed seat fixedly mounted on a primary current-carrying busbar and a floating contact movably mounted on the fixed seat. A spring is provided between the fixed seat and the floating contact to make the floating contact abut against the high-voltage shielding net. The fixed seat is provided with an anti-drop structure to prevent the floating contact from falling out. The fixed seat and the floating contact are electrically connected.

3. The high voltage switch cabinet according to claim 2, characterized in that: The fixing seat is adjustably installed on the primary current-carrying busbar in the radial direction of the inner cavity of the through-type current transformer.

4. The high voltage switch cabinet according to claim 3, characterized in that: The fixing seat is provided with a fixing thread section, and the primary current-carrying busbar is provided with a fixing thread hole. The fixing seat is installed on the primary current-carrying busbar through threaded connection between the fixing thread section and the fixing thread hole.

5. The high voltage switch cabinet according to claim 4, characterized in that: The fixed seat includes a tubular base, a fixed threaded section is arranged at one end of the tubular base, the other end of the tubular base is connected to a limiting sleeve, the floating contact is movably inserted in the tubular base, an outer convex edge is arranged on the floating contact, the anti-slip structure is an inner stop edge arranged on the limiting sleeve for cooperating with the outer convex edge, and a spring is arranged between the fixed seat and the outer convex edge.

6. The high voltage switch cabinet according to claim 5, characterized in that: The inner hole surrounded by the inner stopper of the limiting sleeve cooperates with the floating contact guide.

7. The high voltage switch cabinet according to claim 6, characterized in that: The tubular base is threadedly connected to the limiting sleeve.

8. The high voltage switchgear according to any one of claims 1 to 7, characterized in that: There are more than two elastic conductive contacts which are arranged at intervals in the axial direction of the primary current-carrying conductor.

9. The high voltage switch cabinet according to claim 8, characterized in that: There are two elastic conductive contacts, which are respectively arranged near the two ends of the high-voltage shielding net.

10. The high voltage switchgear according to any one of claims 1 to 7, characterized in that: The through-type current transformer also includes a low-voltage shielding net arranged on the outer ring surface of the secondary winding, and the low-voltage shielding net is used to balance the electric field around the secondary winding.

Images