A low-voltage high short-circuit current switch cabinet

Abstract

The utility model relates to the technical field of switch cabinet, concretely relates to a low voltage high current type switch cabinet of high short current resistance, including switch cabinet body and fixed plate on the switch cabinet body, the switch cabinet body installs the busbar of load current, the fixed plate is equipped with the mounting hole for the busbar passes, the fixed plate is equipped with mounting seat, uses, through adjustable setting insulating sleeve on the mounting seat, and by the adjusting part adjusts the mounting angle of insulating sleeve on the mounting seat, makes the installation state between each busbar can adaptively adjust, and the final included angle arrangement can effectively restrain the magnetic field superposition, and simultaneously because the air gap is equipped with in the inside of switch cabinet body on the insulating sleeve, because air has very low permeability, can effectively interrupt the magnetic flux path, through the air gap can destroy the magnetic circuit closure from the physical level, under the common support of two kinds of ways, can fundamentally eliminate the main cause of loss.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and in particular to a low-voltage, high-current switchgear with high short-current withstand capability. Background Technology

[0002] Low-voltage, high-current switchgear with high short-circuit withstand current is used in low-voltage power distribution systems (generally referring to AC voltage not exceeding 1kV), but can carry large operating currents (e.g., several thousand amperes). It can withstand very high short-circuit currents for a short time without damage and is suitable for critical loads that require a large power supply. It is an electrical device specifically designed for applications that require handling large currents and have high short-circuit withstand capabilities. In order to prevent eddy current generation and heat generation, existing technologies usually use high-voltage bushings to insulate the busbar carrying the load current from the high-voltage switchgear.

[0003] For example, Chinese patent application number CN202022392457.5 discloses a high-voltage bushing and a high-voltage switchgear. The high-voltage bushing insulates the busbar carrying the load current from the high-voltage switchgear. It includes a fixing plate connected to the high-voltage switchgear, with mounting holes for the busbar to pass through. Skirts are provided on both sides of the fixing plate to block the closed-circuit magnetic field generated by the load current. By disrupting the closed-circuit magnetic field, it avoids the eddy currents generated by the bushing, fundamentally reducing the eddy current loss of the high-voltage bushing and significantly lowering the temperature of the high-voltage switchgear during normal operation. However, because the high-voltage bushings are fixed in position, the angle between them cannot be adjusted in time, inevitably resulting in parallel end-face laying between the busbars. This increases the possibility of electromagnetic interference and the formation of closed magnetic circuits, leading to localized overheating and affecting the safety of the switchgear. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a low-voltage high-current type switchgear with high short-current withstand capability, so as to solve the technical problem that the existing technology has a fixed position setting of high-voltage bushings, and the included angle between each high-voltage bushing cannot be adjusted in time, which inevitably leads to the parallel laying of the end faces between each busbar, resulting in an increased possibility of electromagnetic interference and the formation of closed magnetic circuits.

[0005] To achieve the above objectives, this utility model provides a low-voltage, high-current switchgear with high short-term withstand current, comprising a switchgear cabinet and a fixing plate disposed on the switchgear cabinet. A busbar carrying the load current is installed on the switchgear cabinet. The fixing plate has mounting holes for the busbar to pass through and a mounting base. The switchgear also includes:

[0006] An adjustable insulating sleeve is provided on the mounting base. The busbar passes vertically through the insulating sleeve from the switch cabinet body. An air gap is provided on the insulating sleeve inside the switch cabinet body.

[0007] There are several busbars, and adjacent busbars are arranged at an angle by insulating sleeves.

[0008] An adjustment part for adjusting the installation angle of the insulating sleeve on the mounting base.

[0009] Furthermore, a strip-shaped hole is formed in the middle of the insulating sleeve, the busbar passes through the strip-shaped hole, and the air gap is located on both sides of the strip-shaped hole.

[0010] Furthermore, the adjustment unit includes:

[0011] A fixing head is provided on the side end of the mounting base;

[0012] One insulating sleeve corresponds to two fixing heads, and the two fixing heads are disposed opposite each other on both sides of the insulating sleeve;

[0013] A locking bolt is installed on the fixing head, with the top of the locking bolt abutting against the insulating sleeve.

[0014] Furthermore, the insulating sleeve is provided with a skirt on the outside of the switch cabinet, the skirt comprising at least two concentrically stacked skirts, the skirts extending in a direction perpendicular to the mounting base.

[0015] Furthermore, the umbrella skirt includes a first umbrella skirt and a second umbrella skirt located on the inner and outer sides, with the extended end of the second umbrella skirt located on the outer side covering the first umbrella skirt.

[0016] Furthermore, the fixing head has an L-shaped structure, with one end of the fixing head fixedly connected to the side end of the mounting base, and the other end of the fixing head limited to the end face of the insulating sleeve.

[0017] Furthermore, a liquid cooling circulation machine is provided on the outside of the switch cabinet, and the liquid cooling circulation machine is located below the fixed plate.

[0018] Furthermore, the included angle between two adjacent busbars can be adjusted from 30 degrees to 90 degrees.

[0019] The beneficial effects of this utility model are as follows: In use, by adjusting the insulating sleeve on the mounting base and adjusting the installation angle of the insulating sleeve on the mounting base by the adjustment part, the installation state between each busbar can be adaptively adjusted. The final angle arrangement can effectively suppress magnetic field superposition. At the same time, since there is an air gap inside the switch cabinet on the insulating sleeve, and air has extremely low magnetic permeability, it can effectively interrupt the magnetic flux path. Through this air gap, the magnetic circuit closure can be physically destroyed. With the combined effect of the two methods, the main cause of loss can be fundamentally eliminated. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the fixing plate in this utility model;

[0023] Figure 3 This is a schematic diagram of the assembly of the insulating sleeve and the adjusting part in this utility model;

[0024] Figure 4 This is a schematic diagram of the mounting base in this utility model;

[0025] Figure 5 This is a schematic diagram of the insulating sleeve in this utility model;

[0026] Figure 6 This is a schematic diagram of the internal structure of the insulating sleeve in this utility model.

[0027] The diagram is marked as follows:

[0028] 1. Switch cabinet body; 2. Fixing plate; 3. Busbar; 4. Mounting hole; 5. Mounting base; 6. Insulating sleeve; 7. Air gap; 8. Strip hole; 9. Fixing head; 10. Locking bolt; 11. First umbrella skirt; 12. Second umbrella skirt; 13. Liquid cooling circulator. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] The first aspect of this utility model proposes a low-voltage, high-current switchgear with high short-current withstand capability, such as... Figure 1-6 As shown, the switchgear includes a switch cabinet 1 and a mounting plate 2 mounted on the switch cabinet 1. A busbar 3 carrying the load current is installed on the switch cabinet 1. The mounting plate 2 has mounting holes 4 for the busbar 3 to pass through, and a mounting base 5 is provided on the mounting plate 2. The switchgear also includes:

[0032] An adjustable insulating sleeve 6 is provided on the mounting base 5. The busbar 3 passes vertically out of the switch cabinet 1 through the insulating sleeve 6. An air gap 7 is provided on the insulating sleeve 6 inside the switch cabinet 1.

[0033] There are several busbars 3, and two adjacent busbars 3 are arranged at an angle through an insulating sleeve 6.

[0034] An adjustment part for adjusting the installation angle of the insulating sleeve 6 on the mounting base 5.

[0035] In this embodiment, during use, by adjusting the insulating sleeve 6 on the mounting base 5 and adjusting the installation angle of the insulating sleeve 6 on the mounting base 5, the installation state between each busbar 3 can be adaptively adjusted. The final angle arrangement can effectively suppress magnetic field superposition. At the same time, since the insulating sleeve 6 has an air gap 7 inside the switch cabinet 1, and air has extremely low magnetic permeability, it can effectively interrupt the magnetic flux path. Through this air gap 7, the magnetic circuit closure can be physically destroyed.

[0036] In this embodiment, as Figure 3 , Figure 5 As shown, the insulating sleeve 6 has a strip hole 8 in the middle, the busbar 3 passes through the strip hole 8, and the air gap 7 is placed on both sides of the strip hole 8. The air gap 7 covers the end face of the busbar 3 that passes through it, and can also prevent local eddy currents from being generated due to the closed magnetic field inside the switch cabinet 1.

[0037] In this embodiment, as Figure 3 As shown, the adjustment unit includes:

[0038] A fixing head 9 is located at the side end of the mounting base 5;

[0039] One insulating sleeve 6 corresponds to two fixing heads 9, and the two fixing heads 9 are arranged opposite each other on both sides of the insulating sleeve 6;

[0040] The locking bolt 10 is installed on the fixing head 9, and the top of the locking bolt 10 abuts against the insulating sleeve 6. The fixing head 9 has an L-shaped structure. One end of the fixing head 9 is fixedly connected to the side end of the mounting base 5, and the other end of the fixing head 9 is limited to the end face of the insulating sleeve 6. Specifically, by tightening or loosening the locking bolt 10, the insulating sleeve 6 can be effectively clamped and positioned under the guidance of the fixing head 9, which has strong adjustment adaptability.

[0041] In this embodiment, as Figure 1 , Figure 5 As shown, the insulating sleeve 6 is provided with a skirt on the outside of the switch cabinet 1. The skirt includes at least two concentrically stacked skirts. The skirts extend in a direction perpendicular to the mounting base 5. This arrangement can effectively block the magnetic field formed by the load current in the busbar 3 at the connection between the busbar 3 and the switch cabinet 1, and also avoid eddy currents formed by the magnetic field.

[0042] In this embodiment, as Figure 5 As shown, the umbrella skirt includes a first umbrella skirt 11 and a second umbrella skirt 12 located on the inner and outer sides. The extended end of the second umbrella skirt 12 located on the outer side covers the first umbrella skirt 11. Since both the first umbrella skirt 11 and the second umbrella skirt 12 are located on the outer end face of the switch cabinet 1, and the extended end of the second umbrella skirt 12 located on the outer side covers the first umbrella skirt 11, dust adhesion can be effectively reduced and operational safety can be improved.

[0043] In this embodiment, as Figure 1 As shown, a liquid cooling circulator 13 is provided on the outside of the switch cabinet 1. The liquid cooling circulator 13 is placed below the fixed plate 2 to increase the heat dissipation effect and the stability of the switch cabinet 1.

[0044] In this embodiment, as Figure 3 As shown, the included angle between two adjacent busbars 3 can be adjusted from 30 degrees to 90 degrees, so that the installation status of each busbar 3 can be adaptively adjusted.

[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention includes the claims being limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0046] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-voltage, high-current switchgear with high short-current withstand capability, comprising a switchgear cabinet (1) and a fixing plate (2) disposed on the switchgear cabinet (1), wherein a busbar (3) carrying the load current is installed on the switchgear cabinet (1), and the fixing plate (2) is provided with mounting holes (4) for the busbar (3) to pass through, characterized in that, The fixing plate (2) is provided with a mounting base (5), and the switch cabinet also includes: An adjustable insulating sleeve (6) is provided on the mounting base (5). The busbar (3) passes vertically through the insulating sleeve (6) from the switch cabinet (1). An air gap (7) is provided on the insulating sleeve (6) inside the switch cabinet (1). There are several busbars (3), and two adjacent busbars (3) are arranged at an angle to each other through an insulating sleeve (6); An adjustment part for adjusting the mounting angle of the insulating sleeve (6) on the mounting base (5).

2. The low-voltage, high-current switchgear with high short-term withstand current as described in claim 1, characterized in that, The insulating sleeve (6) has a strip-shaped hole (8) in the middle, the busbar (3) passes through the strip-shaped hole (8), and the air gap (7) is located on both sides of the strip-shaped hole (8).

3. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 1, characterized in that, The adjustment unit includes: A fixing head (9) is provided at the side end of the mounting base (5); One insulating sleeve (6) corresponds to two fixing heads (9), and the two fixing heads (9) are disposed opposite each other on both sides of the insulating sleeve (6); The locking bolt (10) is installed on the fixing head (9), and the top of the locking bolt (10) abuts against the insulating sleeve (6).

4. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 1, characterized in that, The insulating sleeve (6) is provided with a skirt outside the switch cabinet (1). The skirt includes at least two concentrically stacked skirts, which extend in a direction perpendicular to the mounting base (5).

5. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 4, characterized in that, The umbrella skirt includes a first umbrella skirt (11) and a second umbrella skirt (12) located on the inner and outer sides, with the extended end of the second umbrella skirt (12) located on the outer side covering the first umbrella skirt (11).

6. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 3, characterized in that, The fixing head (9) has an L-shaped structure. One end of the fixing head (9) is fixedly connected to the side end of the mounting base (5), and the other end of the fixing head (9) is limited to the end face of the insulating sleeve (6).

7. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 1, characterized in that, The switch cabinet (1) is equipped with a liquid cooling circulation machine (13) on its exterior, and the liquid cooling circulation machine (13) is located below the fixing plate (2).

8. A low-voltage, high-current switchgear with high short-term withstand current as described in claim 1, characterized in that, The included angle between two adjacent busbars (3) can be adjusted from 30 degrees to 90 degrees.

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