A switch cabinet zero sequence mutual inductor fixing device

Abstract

The utility model discloses a switchgear zero sequence mutual inductor fixing device, it relates to switchgear technical field, including bending sheet metal part, bending sheet metal part is present the type structure of chi, and bending sheet metal part symmetry sets up, bending sheet metal top is equipped with a plurality of first waist type hole, and first waist type hole is equipped with a plurality of along bending sheet metal piece length direction, bending sheet metal piece side is equipped with a plurality of second waist type hole, and second waist type hole is equipped with a plurality of along bending sheet metal piece length direction, bending sheet metal piece bottom is equipped with third waist type hole, and third waist type hole symmetry sets up, first waist type hole is used for with zero sequence mutual inductor base screw fixed, second waist type hole has T type board and is fixed with, T type board inside sliding connection has the resistance and clamping part, and the resistance and clamping part symmetry sets up in each T type board, this device can install conveniently, and the position adjustment of zero sequence mutual inductor is convenient simultaneously, and promotes the installation stability of zero sequence mutual inductor whole.

Description

Technical Field

[0001] This utility model belongs to the field of switchgear technology, and in particular relates to a zero-sequence current transformer fixing device for switchgear. Background Technology

[0002] Currently, switchgear is an electrical device whose main function is to open, close, control, and protect electrical equipment during the power generation, transmission, distribution, and energy conversion processes in the power system. Zero-sequence current transformers are installed inside the switchgear and are used in conjunction with relay protection devices or signals when a zero-sequence grounding current is generated in the power system, so that the device components can operate to achieve protection or monitoring.

[0003] When an electric shock or leakage fault occurs in the circuit, the secondary side of the current transformer outputs a zero-sequence current, causing the equipment on the connected secondary line to activate protection, such as cutting off the power supply or triggering an alarm. The zero-sequence current transformer is used to detect unbalanced current in the main circuit loop that passes through the current transformer. It is usually mounted on the bottom plate of the switch cabinet and needs to be fixed with a reliable bracket.

[0004] However, some manufacturers simply fix the zero-sequence current transformer in the switch cabinet with bolts without designing a sufficiently sturdy bracket. During long-term use of the switch cabinet, the zero-sequence current transformer is not fixed and its position is prone to shift, which leads to protection failure. Utility Model Content

[0005] The purpose of this utility model is to provide a fixing device for a zero-sequence current transformer in a switchgear. This device is easy to install, facilitates the adjustment of the position of the zero-sequence current transformer, and improves the overall installation stability of the zero-sequence current transformer.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A zero-sequence current transformer fixing device for a switchgear includes a bent sheet metal part, which has a U-shaped structure and is symmetrically arranged. The top of the bent sheet metal part has a plurality of first waist-shaped holes, which are arranged along the length of the bent sheet metal part. The side of the bent sheet metal part has a plurality of second waist-shaped holes, which are arranged along the length of the bent sheet metal part. The bottom of the bent sheet metal part has a third waist-shaped hole, which is symmetrically arranged. The first waist-shaped holes are used to fix the zero-sequence current transformer base with screws. The second waist-shaped holes are screwed to fix a T-shaped plate. The T-shaped plate has a sliding contact clamping member inside, which is symmetrically arranged in each T-shaped plate.

[0008] Furthermore, the bottom of the third waist-shaped hole is provided with a waist-shaped rubber ring that is bonded and fixed to the bent sheet metal part, and the inside of the waist-shaped rubber ring is provided with a through hole that fits the third waist-shaped hole.

[0009] Furthermore, the waist-shaped rubber ring has several placement grooves inside. A first fixing rod is fixed to the top of the placement groove, and a second fixing rod is fixed to the bottom. The end of the first fixing rod away from the placement groove slides inside the second fixing rod. A first spring is fixed inside the second fixing rod, and the other end of the first spring is fixed to the end of the first fixing rod.

[0010] Furthermore, the abutting clamping member includes a crossbar that slides inside the T-shaped plate, an abutting block fixed at the end of the crossbar away from the T-shaped plate, the abutting block being integrally formed with the crossbar and located on the side of the crossbar, and a through groove provided inside the T-shaped plate for the crossbar to slide.

[0011] Furthermore, an ear plate is fixed to the side of the T-shaped plate, and a sleeve is fixed to the ear plate facing the through groove end. A piston rod is slidably connected inside the sleeve. A baffle is fixed to the side of the piston rod extending into the sleeve. The baffle slides along the inner wall of the sleeve. A second spring is fixed between the baffle and the bottom of the sleeve. The second spring is sleeved on the outside of the piston rod. The end of the piston rod away from the sleeve is fixed to the side of the crossbar.

[0012] Furthermore, the T-shaped plate has screw mounting holes at both ends.

[0013] In summary, the beneficial technical effects of this utility model are as follows:

[0014] 1. Using bent sheet metal parts as the installation medium for zero-sequence current transformers, multiple first oblong holes are set on the bent sheet metal parts to facilitate adjustment of the installation position of the zero-sequence current transformers.

[0015] 2. Install a T-shaped plate on the side of the bent sheet metal part. The sliding crossbar and abutment block on the plate can be used to further fix the zero-sequence current transformer. The overall installation is convenient and the zero-sequence current transformer has high installation stability.

[0016] 3. An oblong rubber ring is installed at the bottom of the bent sheet metal part. The oblong rubber ring contacts the inside of the switch cabinet, avoiding direct contact between the bent sheet metal part and the inside of the switch cabinet, thus reducing the overall rigidity after installation. At the same time, an elastic structure is set inside the oblong rubber ring. The elastic structure is made of a first fixed rod, a second fixed rod, and an internal first spring. When the oblong rubber ring is compressed, the internal first spring is compressed, and the first fixed rod and the second fixed rod slide against each other. The mechanical energy of the compression is converted into frictional heat energy and potential energy of the spring generated during the sliding process, which can quickly offset the external pressure and prevent the bent sheet metal part from bending, thus improving the installation stability of the zero-sequence current transformer. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a structural schematic diagram of a switchgear zero-sequence current transformer fixing device according to this embodiment;

[0019] Figure 2 This embodiment describes a fixing device for a zero-sequence current transformer in a switchgear. Figure 1 Top view diagram;

[0020] Figure 3 This embodiment describes a fixing device for a zero-sequence current transformer in a switchgear. Figure 2 A cross-sectional view;

[0021] Figure 4 This is a schematic diagram of the internal structure of the waist-shaped rubber ring of a zero-sequence current transformer fixing device in a switchgear according to this embodiment;

[0022] Figure 5 This is a schematic diagram of the zero-sequence current transformer installation state of a zero-sequence current transformer fixing device for a switchgear according to this embodiment.

[0023] In the diagram: 1. Bending sheet metal part; 2. First waist-shaped hole; 3. Second waist-shaped hole; 4. Third waist-shaped hole; 5. Waist-shaped rubber ring; 6. Through hole; 7. Placement groove; 8. First fixing rod; 9. Second fixing rod; 10. First spring; 11. Crossbar; 12. Abutting block; 13. Through groove; 14. Ear plate; 15. Sleeve; 16. T-shaped plate; 17. Piston rod; 18. Baffle; 19. Second spring; 20. Screw mounting hole. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 This utility model provides a technical solution: a zero-sequence current transformer fixing device for a switch cabinet, comprising a bent sheet metal part 1, the bent sheet metal part 1 having a U-shaped structure, the bent sheet metal part 1 being symmetrically arranged, the top of the bent sheet metal part having a plurality of first waist-shaped holes 2, the first waist-shaped holes 2 being arranged along the length direction of the bent sheet metal part 1, the side of the bent sheet metal part 1 having a plurality of second waist-shaped holes 3, the second waist-shaped holes 3 being arranged along the length direction of the bent sheet metal part 1, the bottom of the bent sheet metal part 1 having a third waist-shaped hole 4, the third waist-shaped holes 4 being symmetrically arranged, the first waist-shaped holes 2 being used for screw fixing with the zero-sequence current transformer base, the second waist-shaped holes 3 being screwed to a T-shaped plate 16, the T-shaped plate 16 having a slidingly connected abutment clamping member inside, the abutment clamping member being symmetrically arranged in each T-shaped plate.

[0027] In this embodiment, the bent sheet metal part 1 is used to be installed inside the switch cabinet and fixed with screws through the third oblong hole 4 provided at its bottom.

[0028] In this embodiment, the bottom of the third waist-shaped hole 4 is provided with a waist-shaped rubber ring 5 that is bonded and fixed to the bent sheet metal part 1, and the inside of the waist-shaped rubber ring 5 is provided with a through hole 6 that fits the third waist-shaped hole 4.

[0029] The waist-shaped rubber ring 5 has several placement grooves 7 inside. A first fixing rod 8 is fixed at the top of the placement groove 7 and a second fixing rod 9 is fixed at the bottom. The end of the first fixing rod 8 away from the placement groove 7 slides inside the second fixing rod 9. A first spring 10 is fixed inside the second fixing rod 9, and the other end of the first spring 10 is fixed to the end of the first fixing rod 8.

[0030] After the bent sheet metal part 1 is installed, its bottom is made to contact the inside of the switch cabinet with the waist-shaped rubber ring 5 to avoid the bent sheet metal part 1 directly contacting the inside of the switch cabinet and reducing the overall rigidity after installation. At the same time, a placement groove 7 is provided inside the waist-shaped rubber ring 5. The placement groove 7 is evenly distributed inside the waist-shaped rubber ring 5 and has an elastic structure inside the placement groove 7.

[0031] The elastic structure is specifically made of a first fixed rod 8, a second fixed rod 9, and an internal first spring 10. When the waist-shaped rubber ring 5 is compressed, the internal first spring 10 is compressed. At the same time, the first fixed rod 8 and the second fixed rod 9 slide against each other. The mechanical energy of the compression is converted into the frictional heat energy and the potential energy of the spring generated during the sliding process. This can quickly offset the external pressure and prevent the bending of the sheet metal part 1, thereby improving the installation stability of the zero-sequence current transformer.

[0032] Based on the above structure, a further abutting clamping component is provided. Specifically, the abutting clamping component includes a crossbar 11 that slides inside the T-shaped plate. An abutting block 12 is fixed at the end of the crossbar 11 away from the T-shaped plate. The abutting block 12 is integrally formed with the crossbar 11 and is located on the side of the crossbar 11. A through groove 13 for the crossbar 11 to slide is provided inside the T-shaped plate 16.

[0033] A lug 14 is fixed to the side of the T-shaped plate 16. A sleeve 15 is fixed to the end of the lug 14 facing the through groove 13. A piston rod 17 is slidably connected inside the sleeve 15. A baffle 18 is fixed to the inside of the piston rod 17. The baffle 18 slides along the inner wall of the sleeve 15. A second spring 19 is fixed between the baffle 18 and the bottom of the sleeve 15. The second spring 19 is sleeved on the outside of the piston rod 17. The end of the piston rod 17 away from the sleeve 15 is fixed to the side of the crossbar 11.

[0034] The contact block 12 abuts against the inner wall of the zero-sequence current transformer. The contact block 12 and the crossbar 11 are located at the top or bottom of the through slot 13 when the second spring 19 is in its initial state. After the zero-sequence current transformer is installed, the crossbar 11 carries the contact block 12 down and the second spring 19 is stretched. At this time, the crossbar 11 and the contact block 12 are in a reset tendency, thereby clamping the zero-sequence current transformer and further improving the stability of the zero-sequence current transformer installation.

[0035] Meanwhile, screw mounting holes 20 are provided at both ends of the T-shaped plate, making the T-shaped plate easy to disassemble and the overall structure quick to install and convenient to use.

[0036] The working principle of this utility model is as follows: a bent sheet metal part 1 is used as the installation medium for the zero-sequence current transformer. Multiple first waist-shaped holes 2 are provided on the bent sheet metal part 1 to facilitate the adjustment of the installation position of the zero-sequence current transformer. At the same time, a T-shaped plate 16 is installed on the side of the bent sheet metal part 1, and the zero-sequence current transformer can be further fixed by the sliding crossbar 11 and the contact block 12 on it. The overall installation is convenient and the zero-sequence current transformer has high installation stability.

[0037] The crossbars and contact blocks are all made of insulating materials.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any 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 fixing device for a zero-sequence current transformer in a switchgear, characterized in that, The device includes a bent sheet metal part (1), which has a U-shaped structure and is symmetrically arranged. The top of the bent sheet metal part has several first waist-shaped holes (2), which are arranged along the length of the bent sheet metal part (1). The side of the bent sheet metal part (1) has several second waist-shaped holes (3), which are arranged along the length of the bent sheet metal part (1). The bottom of the bent sheet metal part (1) has a third waist-shaped hole (4), which is symmetrically arranged. The first waist-shaped hole (2) is used to fix the zero-sequence current transformer base screw. The second waist-shaped hole (3) is screwed to fix a T-shaped plate (16). The T-shaped plate (16) has a sliding connection with an abutment clamping member inside, which is symmetrically arranged in each T-shaped plate (16).

2. The switchgear zero-sequence current transformer fixing device according to claim 1, characterized in that, The bottom of the third waist-shaped hole (4) is provided with a waist-shaped rubber ring (5) that is bonded and fixed on the bent sheet metal part (1), and the inside of the waist-shaped rubber ring (5) is provided with a through hole (6) that fits the third waist-shaped hole (4).

3. The switchgear zero-sequence current transformer fixing device according to claim 2, characterized in that, The waist-shaped rubber ring (5) has several placement grooves (7) inside. A first fixing rod (8) is fixed at the top of the placement groove (7) and a second fixing rod (9) is fixed at the bottom. The end of the first fixing rod (8) away from the placement groove (7) slides inside the second fixing rod (9). A first spring (10) is fixed inside the second fixing rod (9) and the other end of the first spring (10) is fixed to the end of the first fixing rod (8).

4. The switchgear zero-sequence current transformer fixing device according to claim 1, characterized in that, The abutting clamping member includes a crossbar (11) that slides inside the T-shaped plate (16). An abutting block (12) is fixed at the end of the crossbar (11) away from the T-shaped plate (16). The abutting block (12) is integrally formed with the crossbar (11) and is located on the side of the crossbar (11). The T-shaped plate (16) has a through groove (13) inside for the crossbar (11) to slide.

5. The switchgear zero-sequence current transformer fixing device according to claim 4, characterized in that, The T-shaped plate (16) has an ear plate (14) fixed on its side. The ear plate (14) has a sleeve (15) fixed at the end facing the through groove (13). A piston rod (17) is slidably connected inside the sleeve (15). A baffle (18) is fixed inside the sleeve (15). The baffle (18) slides along the inner wall of the sleeve (15). A second spring (19) is fixed between the baffle (18) and the bottom of the sleeve (15). The second spring (19) is sleeved on the outside of the piston rod (17). The end of the piston rod (17) away from the sleeve (15) is fixed on the side of the crossbar (11).

6. The switchgear zero-sequence current transformer fixing device according to claim 1, characterized in that, The T-shaped plate has screw mounting holes (20) at both ends.

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