CN216450937U - Low-voltage switchgear grounding expansion board and low-voltage switchgear - Google Patents
Low-voltage switchgear grounding expansion board and low-voltage switchgear Download PDFInfo
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- CN216450937U CN216450937U CN202123328907.5U CN202123328907U CN216450937U CN 216450937 U CN216450937 U CN 216450937U CN 202123328907 U CN202123328907 U CN 202123328907U CN 216450937 U CN216450937 U CN 216450937U
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Abstract
The utility model relates to a grounding expansion board of a low-voltage switch cabinet, which can conveniently and flexibly provide highly reliable grounding wire connection. This kind of low-voltage switchgear ground connection expansion board includes a rectangular plate body, the central point of rectangular plate body puts and is equipped with fixed screw, and fixing bolt passes fixed screw will rectangular plate body fixes on low-voltage switchgear's component mounting panel, still be equipped with two cable holes on the rectangular plate body, cable hole distributes the both sides of fixed screw, cable hole with fixed screw is a straight line and distributes, the straight line is on a parallel with rectangular plate body's long limit, two cable fixing bolt pass in proper order respectively rectangular plate body with the component mounting panel, and with the inboard cable fixation nut fastening of component mounting panel. The utility model also provides a low-voltage switch cabinet with the low-voltage switch cabinet grounding expansion board.
Description
Technical Field
The utility model relates to a low-voltage switch cabinet grounding expansion board and a low-voltage switch cabinet adopting the same.
Background
As electrical equipment, grounding is an indispensable basic design, and in a low-voltage switch cabinet, a plurality of different switch devices are installed and integrated, and grounding protection is particularly important. The low-voltage switch cabinet among the prior art adopts the component mounting panel as the ground plate usually, and the tapping on the component mounting panel, then adopt bolt crimping earth connection to couple together the mounting panel of difference, when meetting the heavy current, because component mounting panel thickness is thinner, crimping power and thermal stress that the screw-thread fit structure of bolt can provide are not enough, thereby make the reliability of ground connection reduce.
There is also a method of improving the reliability of grounding by welding a grounding bolt to a component mounting plate through a welding process. However, the welding point of the bolt may be corroded, the grounding effect cannot be stably ensured, and the processing cost and labor cost required for welding are greatly increased.
Therefore, a stable and reliable grounding wire fixing scheme becomes a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a grounding expansion board of a low-voltage switch cabinet, which can conveniently and flexibly provide highly reliable grounding wire connection. This kind of low-voltage switchgear ground connection expansion board includes a rectangular plate body, the central point of rectangular plate body puts and is equipped with fixed screw, and fixing bolt passes fixed screw will rectangular plate body fixes on low-voltage switchgear's component mounting panel, still be equipped with two cable holes on the rectangular plate body, cable hole distributes the both sides of fixed screw, cable hole with fixed screw is a straight line and distributes, the straight line is on a parallel with rectangular plate body's long limit, two cable fixing bolt pass in proper order respectively rectangular plate body with the component mounting panel, and with the inboard cable fixation nut fastening of component mounting panel.
According to another aspect of the ground expansion plate of the low-voltage switch cabinet, the cross-sectional area of the rectangular plate body is in direct proportion to the value of the fault current flowing through the protective electric appliance, and the cross-sectional area is a cross-sectional area passing through the fixing screw hole and perpendicular to the long side of the rectangular plate body.
According to another aspect of the ground expansion board of the low-voltage switch cabinet, the cross-sectional area of the rectangular board body is proportional to the square root of the breaking time of the protective electrical appliance.
According to another aspect of the ground expansion board of the low-voltage switch cabinet, the sectional area of the rectangular board body conforms to the following formula: sp 2＝(I2t)/k2(ii) a Wherein SpIs the cross-sectional area of the rectangular plate body; i is the fault current flowing through the protection appliance; t is the breaking time of the protective electric appliance; k is a fixed coefficient obtained from the material of the conductor and the starting and ending temperatures at which the fault current occurs.
The utility model also aims to provide a low-voltage switch cabinet, which is provided with a cabinet body and an element mounting plate arranged in the cabinet body, and is characterized in that the low-voltage switch cabinet grounding expansion plate is fixed on the element mounting plate through a fixing bolt, and a grounding wire is fixed on the low-voltage switch cabinet grounding expansion plate through a cable fixing bolt and is electrically connected with the element mounting plate.
According to another aspect of the low-voltage switch cabinet, the low-voltage switch cabinet comprises at least two component mounting plates, one low-voltage switch cabinet grounding expansion plate is arranged on each component mounting plate, the low-voltage switch cabinet grounding expansion plates are connected in series through a grounding wire, and the low-voltage switch cabinet grounding expansion plate at the tail end is connected with a protective electrical appliance through the grounding wire.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage switchgear grounding expansion board according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a low-voltage switchgear grounding extension plate according to the present invention;
fig. 3 is a schematic view of the connection state of the ground expansion board of the low-voltage switchgear according to the present invention;
fig. 4 is a schematic view of a partial structure of a low-voltage switchgear according to the utility model.
Description of the reference symbols
10 rectangular plate
11 fixed screw hole
12 cable hole
13 cable fixing bolt
14 cable fixing nut
15 cross section
20 element mounting plate
21 ground wire
30 cabinet body
Detailed Description
The following describes a specific embodiment of the present invention with reference to the drawings.
Fig. 1 shows the front of the ground expansion board of the low-voltage switch cabinet, which includes a rectangular plate body 10, a fixing screw hole 11 is provided in the center of the body, two cable holes 12 are respectively provided on two sides of the fixing screw hole 11, and these three holes are parallel to the long side of the rectangular plate body 10 and are arranged in a straight line. The fixing bolts can penetrate through the fixing screw holes 11 to fix the low-voltage switch cabinet grounding expansion plate on an element mounting plate 20 of the low-voltage switch cabinet, and each cable fixing bolt 13 penetrates through the cable hole 12 and the element mounting plate 20 in sequence and can be in threaded fit connection with a cable fixing nut 14 arranged on the inner side of the element mounting plate.
As shown in fig. 2, two cable fixing bolts 13 sequentially pass through the ground expansion plate of the low-voltage switch cabinet and the component mounting plate 20, and two cable fixing nuts 14 on the inner side of the component mounting plate 20 respectively crimp a ground wire 21 on the component mounting plate 20, so that the crimping force provided by the cable fixing bolts 13 is improved, and the stability of the ground circuit is ensured.
In order to reduce the material consumption as much as possible and reduce the volume of additional parts on the low-voltage switch cabinet under the condition of ensuring that the performance reaches the standard, the size and the thickness of the rectangular plate body 10 are selected according to the size and the duration of grounding short-circuit current, namely fault current. Taking the cross-sectional area of the cross-section 15 which passes through the fixing screw hole 11 and is perpendicular to the long side of the rectangular plate body 10 as a reference, when a local short circuit occurs, the larger the fault current flowing through the grounding wire is, the larger the selected cross-sectional area is; meanwhile, the longer the breaking time required for protecting the electric appliance when the local short circuit occurs, the larger the selected cross-sectional area is. In this embodiment, the cross-sectional area of the rectangular plate 10 conforms to the following formula:
Sp 2＝(I2t)/k2；
wherein SpIs a cross-sectional area passing through the fixing screw hole 11 and perpendicular to the long side of the rectangular plate body 10;
i is the fault current flowing through the protection appliance;
t is the breaking time of the protective electric appliance;
k is a constant coefficient obtained from the conductor material and the starting and ending temperatures at which the fault current occurs, and the material used for the rectangular plate body 10 in this embodiment is steel, and k is selected to be 64.
Fig. 3 shows the connection relationship of the low-voltage switch cabinet grounding expansion board of the utility model in the low-voltage switch cabinet, a low-voltage switch cabinet grounding expansion board is fixed on the component mounting plate 20 of each low-voltage switch cabinet through a fixing bolt, wherein two cable fixing bolts 13 on each low-voltage switch cabinet grounding expansion plate are respectively connected with a grounding wire 21 in a pressing mode, wherein, one cable fixing bolt 13 is connected with the grounding expansion plate of the previous low-voltage switch cabinet, the other cable fixing bolt 13 is connected with the grounding expansion plate of the next low-voltage switch cabinet, the grounding expansion plates of the low-voltage switch cabinets are connected in series by a grounding wire 21, and one ground wire 21 is connected with the cable fixing bolt 13 of the ground expansion plate of the previous low-voltage switch cabinet, and the other ground wire 21 is connected to the input port of the protective electric appliance to realize grounding.
Fig. 4 shows in part an embodiment of the low-voltage switchgear cabinet according to the utility model, in which two of the total component mounting plates 20 are shown, the remainder not being shown. The first component mounting plate is provided with a first low-voltage switch cabinet grounding expansion plate, the second component mounting plate is provided with a second low-voltage switch cabinet grounding expansion plate, a cable fixing nut on the first low-voltage switch cabinet grounding expansion plate and a cable fixing nut on the second low-voltage switch cabinet grounding expansion plate are respectively fixed at two ends of the grounding wire 21, so that the two component mounting plates 20 are electrically connected together by the grounding wire 21, the first component mounting plate is connected to the former component mounting plate by a not-shown grounding wire, and the second component mounting plate is connected to the latter component mounting plate by the other not-shown grounding wire. Two cable fixing bolts 13 sequentially penetrate through the low-voltage switch cabinet grounding expansion plate and the element mounting plate 20, and two ends of a grounding wire 21 are respectively crimped on the element mounting plate 20 by two cable fixing nuts 14 on the inner side of the element mounting plate 20, so that the crimping force provided by the cable fixing bolts 13 is improved, and the stability of a grounding circuit is ensured.
Meanwhile, the sectional area of the rectangular plate body 10 of the grounding expansion plate of the low-voltage switch cabinet conforms to the following formula:
Sp 2＝(I2t)/k2；
wherein SpIs the sectional area of the rectangular plate body 10;
i is the fault current flowing through the protection appliance;
t is the breaking time of the protective electric appliance;
k is a constant coefficient obtained from the conductor material and the starting and ending temperatures at which the fault current occurs, and the material used for the rectangular plate body 10 in this embodiment is steel, and k is selected to be 64.
Therefore, the minimum material is used and the occupied space is reduced to the minimum on the premise of meeting the requirement of grounding stability.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims. Furthermore, any reference signs in the claims shall not be construed as limiting the claim concerned. The word "comprising" does not exclude the presence of other devices or steps than those listed in a claim or the specification; the terms "first," "second," and the like are used merely to denote names, and do not denote any particular order. In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but also encompass tolerances as would be understood by one skilled in the art and permitted by fabrication or use.
Claims (6)
1. The ground expansion board of the low-voltage switch cabinet is characterized by comprising a rectangular board body (10), a fixing screw hole (11) is arranged at the central position of the rectangular plate body (10), a fixing bolt penetrates through the fixing screw hole (11) to fix the rectangular plate body (10) on an element mounting plate (20) of the low-voltage switch cabinet, the rectangular plate body (10) is also provided with two cable holes (12), the cable holes (12) are distributed at two sides of the fixed screw hole (11), the cable holes (12) and the fixing screw holes (11) are distributed in a straight line, the straight line is parallel to the long edge of the rectangular plate body (10), two cable fixing bolts (13) respectively penetrate through the rectangular plate body (10) and the element mounting plate (20) in sequence, and is fastened with a cable fixing nut (14) inside the component mounting plate (20).
2. The ground extension plate of a low-voltage switchgear cabinet, according to claim 1, characterized in that the area of the cross section (15) of said rectangular plate (10) is directly proportional to the value of the fault current flowing through the protection apparatus, said cross section (15) being a section passing through said fixing screw (11) and perpendicular to the long sides of said rectangular plate (10).
3. The low-voltage switchgear cabinet ground extension plate according to claim 2, characterized in that the area of the cross section (15) of said rectangular plate (10) is directly proportional to the square root of the breaking time of the protection apparatus.
4. The low-voltage switchgear cabinet ground extension plate according to claim 3, characterized in that the area of said cross section (15) complies with the following formula: sp 2＝(I2t)/k2(ii) a Wherein SpIs the area of said cross section (15); i is the fault current flowing through the protection appliance; t isProtecting the breaking time of the electric appliance; k is a fixed coefficient obtained from the material of the conductor and the starting and ending temperatures at which the fault current occurs.
5. Low-voltage switch cabinet, having a cabinet body (30) and a component mounting plate (20) arranged in the cabinet body, characterized in that the component mounting plate (20) is fixed with the low-voltage switch cabinet grounding expansion plate according to any one of claims 1 to 4 through a fixing bolt, and a grounding wire (21) is pressed on the component mounting plate (20) by the cable fixing nut (14) to realize electrical connection.
6. The low-voltage switch cabinet according to claim 5, characterized by comprising at least two component mounting plates (20), wherein each component mounting plate (20) is provided with one low-voltage switch cabinet ground expansion plate, the low-voltage switch cabinet ground expansion plates are connected in series through the ground wire (21), and the tail end low-voltage switch cabinet ground expansion plate is connected with a protective appliance through the ground wire (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123328907.5U CN216450937U (en) | 2021-12-27 | 2021-12-27 | Low-voltage switchgear grounding expansion board and low-voltage switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123328907.5U CN216450937U (en) | 2021-12-27 | 2021-12-27 | Low-voltage switchgear grounding expansion board and low-voltage switchgear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216450937U true CN216450937U (en) | 2022-05-06 |
Family
ID=81378300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123328907.5U Active CN216450937U (en) | 2021-12-27 | 2021-12-27 | Low-voltage switchgear grounding expansion board and low-voltage switchgear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216450937U (en) |
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2021
- 2021-12-27 CN CN202123328907.5U patent/CN216450937U/en active Active
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