Load switch grounding device and switch cabinet

Abstract

This utility model belongs to the field of power equipment technology and discloses a load switch grounding device and switch cabinet. The load switch grounding device includes a gas box, a load switch, a grounding copper busbar, and three connecting copper busbars. The gas box is equipped with three insulators. By setting three connecting copper busbars, each consisting of a plate-shaped main body, the first end of each plate-shaped main body is connected to the grounding copper busbar, and the second end is connected to the three phases of the load switch. The grounding copper busbar is connected to the three insulators, so that the three connecting copper busbars and the load switch form a conductive circuit. The current output from the load switch forms a grounding circuit through the three connecting copper busbars and the grounding copper busbar. By setting the plate-shaped main body, bending is minimized, ensuring current carrying capacity. Three-phase grounding can be achieved by setting only two specifications of copper busbars. Connecting the three connecting copper busbars and the three insulators to the grounding copper busbar simplifies the connection operation steps, saves copper busbar material, and effectively reduces investment costs.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a load switch grounding device and a switch cabinet. Background Art

[0002] As one of the important equipment in the power system, switchgear is used to open and close, control and protect electrical equipment during power generation, transmission, distribution and power conversion. Switchgear mainly includes circuit breakers, disconnectors and load switches. Switchgear needs to cope with various complex working conditions during operation.

[0003] In order to ensure the normal operation of the switch cabinet, it is necessary to verify the performance indicators through a series of tests, such as dynamic stability test (peak withstand current test) and thermal stability test (short-time withstand current test). During the test, the three phases of the load switch need to be short-circuited and directly grounded to test the switch cabinet's ability to carry current. In the prior art, at least three different specifications of components are used in the switch cabinet to form a three-phase short circuit and direct grounding. After the components are connected, there are many bending positions of varying degrees, resulting in poor current carrying capacity; the structural shape of the components has high requirements, the component investment cost is large, and the actual connection process is cumbersome.

[0004] That is, the existing method uses at least three components of different specifications to connect and form a conductive loop and a grounding loop, and the components have multiple bending positions, which has the disadvantages of poor current carrying capacity, high component investment cost, and cumbersome actual connection operation. Utility Model Content

[0005] The utility model aims to provide a load switch grounding device and switch cabinet to solve the problems of poor current carrying capacity, high component investment cost and complicated actual connection operation in the existing use of at least three components of different specifications to connect to form a grounding loop.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a load switch grounding device, which includes:

[0008] An air box body, wherein three insulators are provided on the air box body;

[0009] A load switch is arranged in the gas box;

[0010] A grounding copper bar is arranged in the gas box, and one end of the grounding copper bar is connected to the three insulators;

[0011] Three connecting copper bars are arranged in the gas box body, each of the connecting copper bars comprises a plate-shaped body, the first ends of the three plate-shaped bodies are connected to the other end of the grounding copper bar, and the second ends of the three plate-shaped bodies are respectively connected to the three phases of the load switch.

[0012] As an optional technical solution for a load switch grounding device, the connecting copper bar is overlapped and fixed to the load switch;

[0013] And / or, the connecting copper busbar is overlapped and fixed to the grounding copper busbar.

[0014] As an optional technical solution for a load switch grounding device, the surface of the grounding copper bar is bonded and connected to the insulator.

[0015] As an optional technical solution for a load switch grounding device, the extension direction of the plate-shaped body is perpendicular to the extension direction of the grounding copper busbar.

[0016] As an optional technical solution for a load switch grounding device, the grounding copper busbar includes a first straight segment and a second straight segment connected to each other, the first straight segment and the second straight segment are arranged at a first preset angle, the first straight segment is connected to the insulator, and the second straight segment is connected to the connecting copper busbar.

[0017] As an optional technical solution for a load switch grounding device, the connecting copper busbar also includes a third straight section connected to the plate-like body, the plate-like body is connected to the load switch through the third straight section, and the third straight section is arranged at a second preset angle with the plate-like body.

[0018] As an optional technical solution for a load switch grounding device, the three connecting copper bars are arranged side by side and evenly spaced.

[0019] As an optional technical solution for a load switch grounding device, the connecting copper bar is connected to a side of the grounding copper bar close to the gas box body.

[0020] As an optional technical solution for a load switch grounding device, the gas box is a closed box, and the gas box contains an air-filled medium;

[0021] And / or, the inflation medium is sulfur hexafluoride or nitrogen.

[0022] The utility model provides a switch cabinet, which comprises the load switch grounding device.

[0023] Beneficial effects:

[0024] The utility model provides a load switch grounding device, which comprises a gas box body, a load switch, a grounding copper bar and three connecting copper bars. The gas box body is provided with three insulators, and the load switch, the grounding copper bar and the connecting copper bar are all arranged in the gas box body. By arranging the three connecting copper bars, the connecting copper bar comprises a plate-shaped main body, the first ends of the three plate-shaped main bodies are all connected to the grounding copper bar and the second ends are correspondingly connected to the three phases of the load switch, the grounding copper bar is connected to the three insulators, so that the three connecting copper bars and the load switch form a conductive loop, and the current output by the load switch forms a grounding loop through the three connecting copper bars and the grounding copper bar; by arranging the connecting copper bar with a plate-shaped main body, bending is reduced as much as possible, and the current carrying capacity is guaranteed; three-phase grounding can be achieved by only arranging two specifications of copper bars (i.e., the connecting copper bar and the grounding copper bar), and the three connecting copper bars and the three insulators are all connected to the grounding copper bar, so that the connection operation steps are simplified, the use of copper bar materials is saved, and the investment cost is effectively reduced.

[0025] The utility model provides a switch cabinet, which comprises a load switch grounding device. The load switch grounding device is arranged to facilitate a withstand current test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a load switch grounding device provided by an embodiment of the utility model;

[0027] Figure 2 The cross-sectional view of the load switch grounding device provided by the embodiment of the utility model Figure 1 ;

[0028] Figure 3 This is a partial cross-sectional view of the load switch grounding device provided by the embodiment of the utility model Figure 1 ;

[0029] Figure 4 This is a partial cross-sectional view of the load switch grounding device provided by the embodiment of the utility model Figure 2 .

[0030] In the figure:

[0031] 10. Gas box; 11. Insulator;

[0032] 20. Grounding copper bar; 21. First straight section; 22. Second straight section;

[0033] 30. Connecting copper bar; 31. Plate-shaped body; 32. Third straight section;

[0034] 40. Load switch; 41. Insulation bracket;

[0035] 50. Stud. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] In the prior art, switchgear is divided into high-voltage switchgear, medium-voltage switchgear and low-voltage switchgear according to voltage level. Usually, low-voltage switchgear is below 400V, medium-voltage switchgear is 10kV~35kV, and high-voltage switchgear is 110kV~400kV.

[0041] like Figures 1 to 4 As shown, on one hand, this embodiment provides a load switch grounding device (hereinafter referred to as "device"), which can be used to be set in a 17.5kV medium voltage switch cabinet or ring network cabinet, and can also be used in other switch cabinets.

[0042] The device includes a gas box body 10, a load switch 40, a grounding copper bar 20 and three connecting copper bars 30. Three insulators 11 are provided on the gas box body 10; the load switch 40 and the grounding copper bar 20 are both arranged in the gas box body 10, and one end of the grounding copper bar 20 is connected to the three insulators 11; the three connecting copper bars 30 are all arranged in the gas box body 10, and each connecting copper bar 30 includes a plate-shaped body 31, and the first ends of the three plate-shaped bodies 31 are connected to the other end of the grounding copper bar 20, and the second ends of the three plate-shaped bodies 31 correspond to the three phases connected to the load switch 40.

[0043] By setting three connecting copper bars 30, each connecting copper bar 30 includes a plate-shaped body 31, the first ends of the three plate-shaped bodies 31 are connected to the grounding copper bar 20 and the second ends are correspondingly connected to the three phases of the load switch 40, and the grounding copper bar 20 is connected to the three insulators 11, so that the three connecting copper bars 30 and the load switch 40 form a conductive loop, and the current output by the load switch 40 forms a grounding loop through the three connecting copper bars 30 and the grounding copper bar 20; by setting the connecting copper bar 30 with a plate-shaped body 31, bending is minimized to ensure the current carrying capacity; three-phase grounding can be achieved by only setting two specifications of copper bars (i.e., the connecting copper bar 30 and the grounding copper bar 20), and the three connecting copper bars 30 and the three insulators 11 are all connected to the grounding copper bar 20, which simplifies the connection operation steps, saves the use of copper bar materials, and effectively reduces the investment cost.

[0044] Specifically, the gas box 10 serves as one of the functional rooms of the switch cabinet; the gas box 10 is a rectangular parallelepiped as a whole, and the gas box 10 is a closed box with an enclosed space for containing an inflatable medium formed inside the gas box 10; the inflatable medium is used for insulation and arc extinguishing. Once a fault occurs in the switch cabinet, the inflatable medium can play an arc extinguishing role, quickly curb the spread of current, and ensure that the switch cabinet is not damaged.

[0045] In this embodiment, the gas-filled medium contained in the enclosed space includes but is not limited to sulfur hexafluoride or nitrogen. In actual application, the selection of the gas-filled medium needs to comprehensively consider multiple aspects such as the equipment type and environmental conditions.

[0046] In this embodiment, the load switch 40 is arranged on the gas box 10 and is located in a confined space for three-phase load control. The load switch 40 is a three-position load switch, which has three working positions, namely, a closing position, an isolation position, and a grounding position. The three-position load switch can realize fast switching or switching of three-phase loads and has high reliability.

[0047] In order to connect the copper bar 30 and the insulator 11, the grounding copper bar 20 includes a first straight section 21 and a second straight section 22 connected to each other, the first straight section 21 and the second straight section 22 are arranged at a first preset angle, the first straight section 21 is connected to the insulator 11, and the second straight section 22 is connected to the copper bar 30. The first preset angle range may be 30 to 120 degrees; the first straight section 21 and the second straight section 22 have the same width, the first straight section 21 and the second straight section 22 have the same thickness, and the length of the first straight section 21 is less than the length of the second straight section 22. In this embodiment, the first preset angle may be 90 degrees, that is, the first straight section 21 is perpendicular to the second straight section 22 (the grounding copper bar 20 is L-shaped).

[0048] In order to adapt to the positions of the load switch 40 and the grounding copper bar 20, the connecting copper bar 30 also includes a third straight section 32 connected to the plate-like body 31. The plate-like body 31 is connected to the load switch 40 through the third straight section 32, and the third straight section 32 and the plate-like body 31 are arranged at a second preset angle. Among them, the second preset angle range can be 30 degrees to 120 degrees; the third straight section 32 is the same as the width of the plate-like body 31, the third straight section 32 is the same as the thickness of the plate-like body 31, and the length of the third straight section 32 is less than the length of the plate-like body 31. In this embodiment, the second preset angle can be 90 degrees, that is, the third straight section 32 is perpendicular to the plate-like body 31 (the connecting copper bar 30 is L-shaped).

[0049] Optionally, the extension direction of the plate-shaped body 31 is perpendicular to the extension direction of the grounding copper bar 20. In this embodiment, the first straight section 21 and the second straight section 22 of the grounding copper bar 20 are both extended in the horizontal direction, and the plate-shaped body 31 is extended in the vertical direction. By setting the extension direction of the plate-shaped body 31 to be perpendicular to the extension direction of the grounding copper bar 20, the length of the plate-shaped body 31 is shorter, thereby avoiding the current carrying capacity being affected by the excessive access length.

[0050] Optionally, the first straight section 21 of the grounding copper bar 20 is surface-fitted and connected to the insulator 11; the connecting copper bar 30 is overlapped and fixed to the load switch 40; the connecting copper bar 30 is overlapped and fixed to the grounding copper bar 20. In this embodiment, the third straight section 32 of the connecting copper bar 30 is overlapped and fixed to the load switch 40 by a first locking member, and the first locking member is a stud 50; the plate-shaped body 31 is overlapped and fixed to the grounding copper bar 20 by a second locking member, and the second locking member is a bolt.

[0051] By providing the first straight section 21 and the second straight section 22, the grounding copper bar 20 can adapt to the connection position of the load switch 40 and the insulator 11; by providing the third straight section 32 and the plate-shaped body 31, the connecting copper bar 30 can adapt to the connection position of the load switch 40 and the grounding copper bar 20; by providing the surface of the first straight section 21 to be fitted and connected to the insulator 11, the connecting copper bar 30 is overlapped and connected to the grounding copper bar 20 by bolts, and the connecting copper bar 30 is overlapped and connected to the load switch 40 by studs 50, the conductive contact area between the grounding copper bar 20 and the insulator 11, between the connecting copper bar 30 and the grounding copper bar 20, and between the connecting copper bar 30 and the load switch 40 is increased, which is helpful to pass a larger current and greatly increases the pass rate of the withstand current test.

[0052] In this embodiment, the load switch 40 includes an insulating support 41 and a static contact. The static contact is disposed on the insulating support 41, and the third straight section 32 connecting the copper busbar 30 is overlapped and fixed on the static contact.

[0053] In this embodiment, both the grounding copper bus 20 and the connecting copper bus 30 are provided with connecting holes. The connecting holes of the connecting copper bus 30 are aligned with the connecting holes at corresponding positions of the grounding copper bus 20. Bolts pass through the connecting holes of the connecting copper bus 30 and the grounding copper bus 20 from one side and are screwed with nuts.

[0054] Optionally, three connecting copper bars 30 are arranged side by side and evenly spaced; the connecting copper bar 30 is connected to the side of the grounding copper bar 20 close to the gas box body 10. By arranging the connecting copper bar 30 on the side of the grounding copper bar 20 close to the gas box body 10, the grounding copper bar 20 can be kept at a distance from the gas box body 10, preventing the grounding copper bar 20 from discharging to the gas box body 10 and affecting the accuracy of the withstand current test.

[0055] On the other hand, this embodiment further provides a switch cabinet including the above load switch grounding device. By providing the load switch grounding device, the installation is simple and it is helpful to perform a withstand current test.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A load switch grounding device, characterized in that: For withstand current testing, including: An air box body (10), wherein three insulators (11) are provided on the air box body (10); A load switch (40) is arranged in the gas box (10); A grounding copper bar (20) is arranged in the gas box (10), and one end of the grounding copper bar (20) is connected to the three insulators (11); Three connecting copper bars (30) are arranged in the gas box (10), each of the connecting copper bars (30) comprises a plate-shaped body (31), the first ends of the three plate-shaped bodies (31) are connected to the other end of the grounding copper bar (20), and the second ends of the three plate-shaped bodies (31) are respectively connected to the three phases of the load switch (40).

2. The load switch grounding device according to claim 1, characterized in that: The connecting copper bar (30) is overlapped and fixed to the load switch (40); And / or, the connecting copper busbar (30) is overlapped and fixed to the grounding copper busbar (20).

3. The load switch grounding device according to claim 1, characterized in that: The surface of the grounding copper bar (20) is bonded and connected to the insulator (11).

4. The load switch grounding device according to claim 1, characterized in that: The extension direction of the plate-shaped body (31) is perpendicular to the extension direction of the grounding copper busbar (20).

5. The load switch grounding device according to claim 1, characterized in that: The grounding copper bar (20) comprises a first straight section (21) and a second straight section (22) which are connected to each other, the first straight section (21) and the second straight section (22) being arranged at a first preset angle, the first straight section (21) being connected to the insulator (11), and the second straight section (22) being connected to the connecting copper bar (30).

6. The load switch grounding device according to claim 1, characterized in that: The connecting copper bar (30) further comprises a third straight section (32) connected to the plate-shaped body (31); the plate-shaped body (31) is connected to the load switch (40) via the third straight section (32); and the third straight section (32) and the plate-shaped body (31) are arranged at a second preset angle.

7. The load switch grounding device according to claim 1, characterized in that: The three connecting copper bars (30) are arranged side by side and evenly spaced.

8. The load switch grounding device according to claim 1, characterized in that: The connecting copper bar (30) is connected to a side of the grounding copper bar (20) close to the gas box body (10).

9. The load switch grounding device according to claim 1, characterized in that: The air box (10) is a closed box, and the air box (10) contains an inflatable medium; And / or, the inflation medium is sulfur hexafluoride or nitrogen.

10. A switch cabinet, characterized in that: It comprises a load switch grounding device as described in any one of claims 1 to 9.

Images