Switch cabinet

Abstract

The utility model discloses a switch cabinet, comprising a cabinet body which is provided with an accommodating cavity and a bottom plate; the accommodating cavity is also internally provided with a contact; a cable; the first end of the copper bar is electrically connected with the contact, and the second end of the copper bar is electrically connected with the upper end of the cable; the bottom plate is provided with a sunken part which is sunken downwards, an opening of the sunken part faces upwards, the sunken part is communicated with the containing cavity, the sunken part is located under the position where the second end of the copper bar is electrically connected with the cable, a zero-sequence mutual inductor is arranged in the sunken part, and the cable penetrates through the zero-sequence mutual inductor downwards. The concave part is arranged on the bottom plate, so that the vertical distance between the electric connection position of the second end of the copper bar and the cable and the inner bottom surface of the cabinet body can be increased; meanwhile, the zero sequence mutual inductor is arranged in the concave part, the space of the concave part is fully utilized, the space in the containing cavity is saved, and the structure is reasonable and practical.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a switch cabinet. Background Art

[0002] The switch cabinet is an electrical device. The external line of the switch cabinet first enters the main control switch inside the cabinet, and then enters the sub-control switch. Each branch is set according to its needs. The main function of the switch cabinet is to open and close, control and protect electrical equipment during the power generation, transmission, distribution and energy conversion of the power system. The components in the switch cabinet are generally composed of circuit breakers, disconnectors, load switches, operating mechanisms, transformers and various protection devices.

[0003] The switch cabinet includes a cabinet body, which has a receiving cavity, and the receiving cavity is also provided with a contact, a current transformer, a copper bar, etc. The first end of the copper bar is electrically connected to the contact, the second end of the copper bar is electrically connected to the cable, and the cable is used to pass through the zero sequence transformer downward, and the third end of the copper bar is electrically connected to the current transformer.

[0004] At present, the design of switch cabinets needs to meet different requirements, among which the more common requirements are: first, the electrical connection position between the copper busbar and the cable must meet certain requirements in terms of the upper and lower distances from the bottom surface of the switch cabinet to facilitate cable installation, or / and increase the distance between electronic components, improve safety, or / and provide inspection and maintenance space. For example, the upper and lower distance is generally required to be greater than or equal to 700mm; second, the electrical connection position between the second end of the copper busbar and the cable must be observable from outside the cabinet observation window.

[0005] However, the space size of the switch cabinet cavity is relatively fixed, and there are many electronic components in the cavity. Therefore, it is necessary to design a suitable switch cabinet structure. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a switch cabinet capable of increasing the upper and lower distances between the electrical connection positions of the copper busbar and the cable and the inner bottom surface of the switch cabinet in view of the current status of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a switch cabinet which is convenient for observing the electrical connection position from outside the observation window.

[0008] The utility model adopts the following technical solution to solve the above-mentioned first technical problem: a switch cabinet, comprising a cabinet body with a containing cavity, wherein the cabinet body has a bottom plate;

[0009] The accommodating cavity is also provided with:

[0010] Contacts;

[0011] cable;

[0012] A copper busbar, a first end of which is electrically connected to the contact, and a second end of which is electrically connected to the upper end of the cable;

[0013] Features:

[0014] The bottom plate has a downwardly recessed portion, the recessed portion opens upward and is connected to the accommodating cavity. The recessed portion is located directly below the electrical connection position between the second end of the copper busbar and the cable. A zero-sequence mutual inductor is arranged in the recessed portion, and the cable passes downward through the zero-sequence mutual inductor.

[0015] In order to facilitate the installation of zero-sequence transformers, it also includes

[0016] The mounting bracket is at least partially arranged in the recessed portion for mounting the zero-sequence transformer.

[0017] In order to ensure the stability of the recessed portion, a wiring bracket is provided on the bottom plate at a position outside the recessed portion, and the wiring bracket has a wiring groove;

[0018] The mounting bracket is connected to the wiring bracket.

[0019] In this way, the weight of the zero-sequence transformer is transferred to the wiring bracket via the mounting bracket, which is conducive to ensuring the stability of the recessed portion itself and preventing the recessed portion itself from being easily deformed or damaged by stress.

[0020] The positional relationship between the mounting bracket and the wiring is that a portion of the mounting bracket is placed on the upper surface of the wiring bracket. In this way, the mounting bracket is easy to install.

[0021] The structures of the mounting bracket can be various. Preferably, there are at least two wiring brackets, which are spaced apart.

[0022] The mounting bracket includes

[0023] A mounting plate is located in the recessed portion and extends up and down, and is connected to the zero-sequence transformer;

[0024] The crossbeam is located outside the recessed portion, the middle portion of the crossbeam is connected to the upper end of the mounting plate, and the two ends of the crossbeam are respectively placed on corresponding wiring brackets and connected to the wiring brackets.

[0025] In this way, the weight of the zero-sequence transformer is transferred to the wiring bracket via the crossbeam.

[0026] In order to facilitate the positioning and installation of the mounting plate, the mounting plate has a positioning groove or a positioning hole for the zero-sequence mutual inductor to be installed and positioned.

[0027] The shape of the zero-sequence transformer is specifically:

[0028] The main body is annular and has a mounting hole extending vertically and horizontally, and the mounting hole is used for the cable to pass through;

[0029] The mounting portion is connected to the side wall of the body, and the mounting portion is connected to the mounting bracket.

[0030] In order to constrain the position of the cable and support the zero-sequence transformer at the same time, it also includes

[0031] The clamp is connected to the side wall of the recessed portion and is used to circumferentially constrain the cable; the clamp is located below the main body and is used to support the main body upward.

[0032] In this way, the clamp wraps the cable on the one hand, which is conducive to the neatness and order of the cable; on the other hand, the clamp supports the zero-sequence transformer upward, which is conducive to maintaining the zero-sequence transformer in the required position and not easily falling off.

[0033] In order to further solve the second technical problem of the present application, the accommodating cavity is also provided with

[0034] The current transformer is located above the zero-sequence transformer;

[0035] The third end of the copper busbar is electrically connected to the current transformer;

[0036] An observation window is provided on the side wall of the cabinet, and the electrical connection position between the second end of the copper busbar and the cable is within the observation range of the observation window, and the electrical connection position is lower than the position of the current transformer.

[0037] Thus, by rationally arranging the switch cabinet parts in space, the current transformer will not interfere with the view of the electrical connection position observed from the observation window. However, it is difficult for conventional switch cabinets to simultaneously solve the first and second technical problems mentioned above.

[0038] Preferably, the distance between the inner bottom surface of the recessed portion and the electrical connection position in the vertical direction is greater than or equal to 700 mm. In this way, the national grid standard can be met.

[0039] Compared with the prior art, the utility model has the advantages that: by setting a recessed portion in the bottom plate, it is beneficial to increase the vertical distance between the second end of the copper bar and the cable electrical connection position and the bottom surface of the cabinet; at the same time, a zero-sequence mutual inductor is set in the recessed portion, so that the space of the recessed portion can be fully utilized, the space in the accommodating cavity can be saved, and the structure is reasonable and practical. During use, the switch cabinet is generally placed on the cable trench, so that the recessed portion is located in the cable trench and the space in the cable trench can be utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the utility model;

[0041] Figure 2 for Figure 1 A magnified schematic diagram of the local A in the middle;

[0042] Figure 3 A schematic diagram of another angle of the embodiment of the utility model;

[0043] Figure 4 A schematic diagram of another angle of the embodiment of the utility model;

[0044] Figure 5 This is a schematic diagram of the assembly of the base plate, zero-sequence transformer, mounting bracket, etc. of the embodiment of the utility model;

[0045] Figure 6 for Figure 5 sectional view of . DETAILED DESCRIPTION

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0047] See also Figure 1 to Figure 6 , which is a preferred embodiment of the utility model. The switch cabinet includes a cabinet body 100, the cabinet body 100 has a receiving cavity 100a, and the cabinet body 100 has a bottom plate 1; the receiving cavity 100a is also provided with a cable 5, a contact 6, a current transformer 7, and a copper bar 8, and the switch cabinet also includes a mounting bracket 3, a clamp 400, a tower spring 300 provided on the cable 5 and other main components.

[0048] Among them, see Figure 2 , Figure 3 , Figure 6 The first end of the copper busbar 8 is electrically connected to the contact 6 , and the second end of the copper busbar 8 is electrically connected to the upper end of the cable 5 ; the third end of the copper busbar 8 is electrically connected to the current transformer 7 .

[0049] The bottom plate 1 has a downwardly recessed portion 11, which opens upward and is connected to the accommodating cavity 100a. The recessed portion 11 is located directly below the electrical connection position 200 between the second end of the copper busbar 8 and the cable 5. A zero-sequence transformer 2 is arranged in the recessed portion 11, and the cable 5 passes downward.

[0050] Specifically, the shape of the recessed portion 11 is quadrilateral, or other polygonal, or circular. The recessed portion 11 and the rest of the bottom plate 1 are integrally formed, or the two are fixedly connected by fasteners. The recessed portion 11 itself is integrally formed, or the recessed portion 11 itself is surrounded by multiple connecting plates fixed by fasteners. Preferably, see Figure 3 The distance between the inner bottom surface 111 of the recessed portion 11 and the electrical connection position 200 in the up-down direction is greater than or equal to 700 mm.

[0051] A wiring bracket 4 is provided on the bottom plate 1 outside the recessed portion 11. The wiring bracket 4 has a wiring groove. The mounting bracket 3 is connected to the wiring bracket 4. A part of the mounting bracket 3 is placed on the upper surface of the wiring bracket 4. There are two wiring brackets 4, which are spaced apart.

[0052] The mounting bracket 3 is partially arranged in the recessed portion 11 for the installation of the zero-sequence transformer 2. The mounting bracket 3 may also be entirely located in the recessed portion 11. Specifically, in the present embodiment, the mounting bracket 3 includes a mounting plate 31 and a crossbeam 32; the mounting plate 31 is located in the recessed portion 11 extending up and down, and is connected to the zero-sequence transformer 2; the crossbeam 32 is located outside the recessed portion 11, the middle portion of the crossbeam 32 is connected to the upper end of the mounting plate 31, and the two ends of the crossbeam 32 are respectively placed on the corresponding wiring bracket 4 and are connected to the wiring bracket 4. The mounting plate 31 has a positioning groove or positioning hole 2a for the installation and positioning of the zero-sequence transformer 2, and the mounting plate 31 and the zero-sequence transformer 2 are locked at the position of the positioning hole 2a by bolts and nuts.

[0053] The zero-sequence transformer 2 includes a body 21 and a mounting portion 22 ; the body 21 is annular and has a mounting hole 211 extending vertically therethrough, the mounting hole 211 being used for the cable 5 to pass through; the mounting portion 22 is connected to the side wall of the body 21 , and the mounting portion 22 is connected to the mounting bracket 3 .

[0054] The clamp 400 is connected to the side wall of the recessed portion 11 and is used to circumferentially constrain the cable 5 ; the clamp 400 is located below the body 21 and is used to support the body 21 upward.

[0055] The current transformer 7 is located above the zero-sequence transformer 2 .

[0056] An observation window 9 is provided on the side wall of the cabinet 100 . The electrical connection position 200 between the second end of the copper busbar 8 and the cable 5 is within the observation range of the observation window 9 , and the electrical connection position 200 is lower than the position of the current transformer 7 .

[0057] The working principle and usage process are as follows.

[0058] The bottom plate 1 of the switch cabinet is placed on a cable trench (not shown in the figure), and the recessed portion 11 is located in the cable trench. The recessed portion 11 is provided to increase the vertical distance between the inner bottom surface 111 of the recessed portion 11 and the electrical connection position 200, and at the same time, the space in the cable trench can be fully utilized.

[0059] By providing the mounting bracket 3 , the mounting bracket 3 is connected to the wiring bracket 4 , so that the weight of the zero-sequence transformer 2 is finally transferred to the wiring bracket 4 , which is conducive to the stability of the recessed portion 11 itself.

[0060] In addition, a support hoop 400 is provided below the zero-sequence transformer 2, which is beneficial for maintaining the zero-sequence transformer 2 at a required position and preventing it from falling off easily.

[0061] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A switch cabinet, comprising A cabinet (100) having a receiving cavity (100a), wherein the cabinet (100) has a bottom plate (1); The accommodating cavity (100a) is further provided with: Contact (6); Cable (5); A copper busbar (8), a first end of which is electrically connected to the contact (6), and a second end of which is electrically connected to the upper end of the cable (5); Features: The bottom plate (1) has a recessed portion (11) that is recessed downwards, the recessed portion (11) is opened upwards and is in communication with the accommodating cavity (100a), the recessed portion (11) is located directly below the electrical connection position (200) between the second end of the copper busbar (8) and the cable (5), and a zero-sequence mutual inductor (2) is arranged in the recessed portion (11), and the cable (5) passes downwards through the zero-sequence mutual inductor (2).

2. The switch cabinet according to claim 1, characterized in that: Also includes The mounting bracket (3) is at least partially arranged in the recessed portion (11) for mounting the zero-sequence mutual inductor (2).

3. The switch cabinet according to claim 2, characterized in that: A wiring bracket (4) is provided on the bottom plate (1) at a position outside the recessed portion (11), and the wiring bracket (4) has a wiring groove; The mounting bracket (3) is connected to the wiring bracket (4).

4. The switch cabinet according to claim 3, characterized in that: Part of the mounting bracket (3) is placed on the upper surface of the wiring bracket (4).

5. The switch cabinet according to claim 3, characterized in that: There are at least two wiring brackets (4) which are spaced apart from each other; The mounting bracket (3) comprises A mounting plate (31) is located in the recessed portion (11) and extends vertically, and is connected to the zero-sequence mutual inductor (2); The crossbeam (32) is located outside the recessed portion (11), the middle portion of the crossbeam (32) is connected to the upper end of the mounting plate (31), and the two ends of the crossbeam (32) are respectively placed on the corresponding wiring bracket (4) and connected to the wiring bracket (4).

6. The switch cabinet according to claim 5, characterized in that: The mounting plate (31) has a positioning groove or a positioning hole (2a) for mounting and positioning the zero-sequence mutual inductor (2).

7. The switch cabinet according to claim 2, characterized in that: The zero-sequence transformer (2) comprises The body (21) is annular and has a mounting hole (211) penetrating from top to bottom, and the mounting hole (211) is used for the cable (5) to pass through; The mounting portion (22) is connected to the side wall of the body (21), and the mounting portion (22) is connected to the mounting bracket (3).

8. The switch cabinet according to claim 7, characterized in that: Also includes The hoop (400) is connected to the side wall of the recessed portion (11) and is used to circumferentially constrain the cable (5); the hoop (400) is located below the body (21) and is used to support the body (21) upwards.

9. The switch cabinet according to claim 1, characterized in that: The accommodating cavity (100a) is also provided with A current transformer (7) is located above the zero-sequence transformer (2); The third end of the copper busbar (8) is electrically connected to the current transformer (7); An observation window (9) is provided on the side wall of the cabinet (100); the electrical connection position (200) between the second end of the copper busbar (8) and the cable (5) is within the observation range of the observation window (9), and the electrical connection position (200) is lower than the position of the current transformer (7).

10. The switch cabinet according to claim 9, characterized in that: The distance between the inner bottom surface (111) of the recessed portion (11) and the electrical connection position (200) in the up-down direction is greater than or equal to 700 mm.

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