Compact switch equipment applying bushing type current transformer

Abstract

The utility model discloses a compact switch device using a bushing type current transformer, and relates to the technical field of AC enclosed switch devices. The utility model specifically comprises two cabinet bodies of which the side walls are connected, the side wall of the cabinet body connected with the cabinet body is provided with a mounting hole, the mounting hole is provided with a mounting assembly, the mounting assembly is used for fixing the bushing type current transformer, and the mounting assembly enables the two ends of the bushing type current transformer to be respectively positioned in the two cabinet bodies. According to the utility model, the structural improvement is carried out based on the cabinet body of the existing switch equipment, so that the bushing type current transformer can be installed in the existing cabinet body without re-customizing and widening the cabinet body, and the effect of reducing the cost is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of AC enclosed switchgear, specifically providing a compact switchgear that uses a bushing-type current transformer. Background Technology

[0002] The AC switchgear is equipped with a three-phase AC power system, which includes conductive components for current distribution and connection. These conductive components are A-phase busbars, B-phase busbars, and C-phase busbars. When two switchgear units are connected, A-phase busbars are connected to A-phase busbars, B-phase busbars to B-phase busbars, and C-phase busbars to C-phase busbars. Furthermore, current transformers are required when connecting the busbars.

[0003] While the existing KYN28A-12 AC metal-enclosed switchgear offers a mature current transformer installation method, bushing-type current transformers are often chosen for high-current projects or special projects with system currents exceeding 2500A. When using bushing-type current transformers, they are typically installed inside a cabinet. However, the original cabinet's internal space is insufficient to accommodate the bushing-type current transformer, necessitating cabinet expansion. This expansion requires the fabrication of a separate cabinet. Therefore, this traditional installation method renders standard cabinets unusable, necessitating custom-made cabinets and significantly increasing costs. Utility Model Content

[0004] This utility model provides a compact switchgear that uses bushing-type current transformers to solve the problem of increased costs caused by the need for customized and widened cabinets when installing bushing-type current transformers.

[0005] The technical solution of this utility model is as follows:

[0006] A compact switchgear using a bushing-type current transformer includes two cabinets connected by side walls. The side walls connected to the cabinets are provided with mounting holes, and mounting components are provided at the mounting holes. The mounting components are used to fix the bushing-type current transformer, and the mounting components are arranged so that the two ends of the bushing-type current transformer are respectively located in the two cabinets.

[0007] In this design, through holes are provided in the side walls between the cabinets, allowing the mounting components to position the bushing-type current transformer so that its two ends are located within the two separate cabinets. This installation method fully utilizes the space between the internal structure of the cabinet and the side walls; the space between the structures on both sides of the mounting hole is sufficient to accommodate the bushing-type current transformer. This setup can be directly fabricated on existing switchgear cabinets without requiring additional widened cabinets, thus reducing costs.

[0008] Multiple bushing current transformers need to be installed in the switchgear. To facilitate the installation of multiple bushing current transformers, the mounting assembly includes a back plate. The back plate is provided with through holes for the bushing current transformers to pass through, and the bushing current transformers are fixed to the back plate.

[0009] In this solution, each bushing-type current transformer can be first installed and fixed to the back plate, and then the back plate is connected to the side wall of the cabinet. The advantage of this installation method is its high installation efficiency, because each bushing-type current transformer can be installed in an open space when mounted on the back plate, which is more convenient than installing in the narrow space inside the cabinet, thus improving installation efficiency.

[0010] Preferably, the back plate is fixedly connected to the side wall where the mounting hole is located, and the mounting hole is closed when the back plate is connected to the side wall.

[0011] In this solution, the mounting holes are sealed after the back panel is installed, so that the two cabinets remain isolated from each other and will not be directly connected, thus ensuring that the original layout of the cabinets remains unchanged.

[0012] Since the back panel is connected to the side wall of the cabinet, its position is fixed. Multiple bushing-type current transformers need to be installed on the back panel. The distance between each bushing-type current transformer and other structures within the cabinet varies. To prevent interference from existing structures within the cabinet, the mounting assembly includes a padding material. The bushing-type current transformer is fixedly connected to the padding material, which is also fixedly connected to the back panel. The padding material is used to adjust the distance between the bushing-type current transformer and the side wall where the mounting hole is located.

[0013] In this solution, the bushing-type current transformer is connected to the back plate through padding material, so the distance between the bushing-type current transformer and the back plate is no longer fixed. The padding material can be set according to the actual situation inside the cabinet, thereby changing the position of the bushing-type current transformer relative to the back plate, and thus changing the position of the bushing-type current transformer inside the cabinet, avoiding interference from the original structure inside the cabinet during the installation of the bushing-type current transformer.

[0014] Preferably, the bushing-type current transformer has a lug plate on its side wall, the lug plate has a fixing hole, and the pad material has a connecting hole corresponding to the fixing hole. The fixing hole and the connecting hole are used for fasteners to connect the bushing-type current transformer and the pad material.

[0015] In this solution, the bushing-type current transformer and the pad material are connected by bolt fixing, which is a simple, effective and easy-to-operate connection method.

[0016] Preferably, the bushing-type current transformer has lugs on opposite sides, and the lugs on both sides are connected to two pads respectively.

[0017] In this scheme, two pads are respectively set to connect with the two lugs of the bushing current transformer, which can improve the installation stability of the bushing current transformer.

[0018] Preferably, the padding material is a sheet material with bent edges, and the bent edges of the sheet material form a three-dimensional structure.

[0019] In this solution, the padding material is made by bending sheet metal. The bending process of sheet metal is low-cost, which can reduce material costs.

[0020] Preferably, the cabinet is provided with a three-phase busbar, which includes an A-phase busbar, a B-phase busbar, and a C-phase busbar. Based on the distance between the bushing current transformer and the corresponding two busbars, the bushing current transformer and the corresponding nearest busbar are located on both sides of the back plate, and a pad is provided between the bushing current transformer and the back plate.

[0021] In this scheme, the position of the padding material is set according to the position of the original structure inside the cabinet for each bushing current transformer, thereby maximizing the distance between the bushing current transformer and the original structure inside the cabinet, thus improving the insulation effect.

[0022] Bushing-type current transformers require connecting wires, and the wire interfaces are typically located on the lug plate. To facilitate wire installation, the wires are usually placed on the same side of the back plate. Therefore, when pads are provided on both sides of the back plate, the pads can obstruct the wire connection. To solve this problem, the pads include a first pad and a second pad, which are used for connecting to the lug plate on the sides near and away from the back plate, respectively.

[0023] In this design, two types of pads are provided for connection to both sides of the ear plate. Therefore, if the first pad would obstruct the installation of the wires, the second pad is used to connect to the ear plate. Since the second pad connects to the other side of the ear plate, it will not obstruct the wires on that side, thus solving the problem of the pads obstructing the wire connection.

[0024] Preferably, the ear plate is provided with an interface for connecting external wires, and the interfaces of each bushing current transformer are located on the same side of the corresponding ear plate.

[0025] In this solution, the interface is located on the same side of the ear plate, so that the wires can be introduced from the same side of the back plate, making the wire layout neater and facilitating subsequent maintenance.

[0026] The beneficial effects of this utility model are:

[0027] This invention makes structural improvements to the cabinet of existing switchgear, enabling bushing-type current transformers to be installed in existing cabinets without the need for custom-made, widened cabinets, thus reducing costs. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a layout diagram from the main viewpoint of this utility model;

[0030] Figure 2 This is a top-view layout diagram of the present invention;

[0031] Figure 3 This is a layout diagram from the right-side view of this utility model;

[0032] Figure 4 This is a schematic diagram of the installation components and bushing-type current transformer of this utility model.

[0033] Figure 5 This is a schematic diagram of the pad material and bushing-type current transformer of this utility model.

[0034] Figure 6 This is a structural schematic diagram of one embodiment of the first padding material of this utility model.

[0035] In the above figures, the corresponding reference numerals are as follows:

[0036] 1. Cabinet; 2. Bushing-type current transformer; 3. Side wall; 4. Phase A busbar; 5. Phase B busbar; 6. Phase C busbar; 7. Induction copper busbar; 8. Back plate; 9. Padding material; 10. Ear plate; 11. Through hole; 12. Interface; 91. First padding material; 92. Second padding material. Detailed Implementation

[0037] The technical solution of this utility model will be clearly and completely described in conjunction with the accompanying drawings and through specific embodiments.

[0038] Example 1:

[0039] like Figure 1As shown, this embodiment provides a compact switchgear using a bushing-type current transformer 2, comprising a cabinet 1 with two connected side walls 3. The two cabinets 1 are connected via the side walls 3, or the two cabinets 1 share the same side wall 3. Mounting holes are provided on the side wall 3 for mounting the bushing-type current transformer 2, allowing both ends of the bushing-type current transformer 2 to be located within the two cabinets 1 respectively. The space between the existing structure of the cabinet 1 and the side wall 3 of the cabinet 1 is used to install the bushing-type current transformer 2, combining the remaining space within the two cabinets 1. This allows the bushing-type current transformer 2 to be installed at the junction of the two cabinets 1 without widening the cabinet 1. The bushing-type current transformer 2 is installed and fixed using a mounting assembly. The bushing-type current transformer 2 is connected to the mounting assembly, which in turn is connected to the side wall 3 of the cabinet 1.

[0040] The mounting assembly includes a back plate 8 and a pad 9. The back plate 8 is used to connect to the side wall 3, and the bushing-type current transformer 2 is connected to the pad 9. The pad 9 is fixed to the back plate 8.

[0041] The back plate 8 and the side wall 3 can be connected by bolts. Holes are made on the back plate 8 and the side wall 3 for the bolts to pass through, so that the bolts fix the back plate 8 to the side wall 3.

[0042] Since the two ends of the bushing-type current transformer 2 are located inside the two cabinets 1 respectively, a through hole 11 is provided on the back plate 8. The shape of the through hole 11 is adapted to the shape of the outer shell of the bushing-type current transformer 2, and the bushing-type current transformer 2 is in a state of penetrating through the through hole 11. When the back plate 8 is connected to the side wall 3 of the cabinet 1, the two ends of the bushing-type current transformer 2 are located on both sides of the back plate 8 respectively.

[0043] If the outer shell of the bushing current transformer 2 is cylindrical, then the through hole 11 provided on the back plate 8 is circular, and the diameter of the through hole 11 is the same as the outer diameter of the bushing current transformer 2.

[0044] When the back panel 8 is fixed to the side wall 3, the back panel 8 seals off the mounting holes. This keeps the two cabinets 1 isolated from each other, preventing any change to the isolated layout of the two cabinets 1.

[0045] The pad material 9 is made of bent metal sheet, with the edges bent to form a three-dimensional structure with a certain thickness. The pad material 9 has a certain thickness, allowing the position of the bushing-type current transformer 2 relative to the back plate 8 to be adjusted, making the bushing-type current transformer 2 more inclined towards the interior of the cabinet 1. The purpose of using the pad material 9 to make the bushing-type current transformer 2 more inclined towards the interior of the cabinet 1 is to avoid interference from the existing structure within the cabinet 1 during the installation of the bushing-type current transformer 2.

[0046] The AC switch cabinet 1 typically contains a main busbar and branch busbars. The main busbar is a flat or strip-shaped conductive metal, usually copper or aluminum, used for centralized power distribution within the switch cabinet. Branch busbars branch off from the main busbar, transmitting power to specific equipment or circuits. A three-phase AC system has three independent phases: A-phase, B-phase, and C-phase. The corresponding branch busbars for these three phases are A-phase branch busbar 4, B-phase branch busbar 5, and C-phase branch busbar 6, respectively. When installing a bushing-type current transformer 2, if the bushing-type current transformer 2 corresponds to the A-phase branch busbar 4 of two switch cabinets 1, then the bushing-type current transformer 2 is located between the A-phase branch busbars 4 of the two switch cabinets 1. At this point, if the distance between a phase A busbar 4 and the side wall 3 connected to the mounting assembly is 8cm, and the length of the bushing current transformer 2 is 20cm, with the middle of the bushing current transformer 2 connected to the pad material 9, then a pad material 9 with a thickness greater than 2cm can be selected to connect to the bushing current transformer 2, and the pad material 9 is located on the side of the back plate 8 away from the phase A busbar 4. By changing the position of the bushing current transformer through the pad material 9, the installation of the bushing current transformer 2 will not be interfered with by the corresponding phase A busbar 4.

[0047] The housing of the bushing-type current transformer 2 is provided with a lug plate 10. The lug plate 10 has a plane parallel to the back plate 8 and is fixedly connected to the pad material 9. The lug plate 10 is provided with a fixing hole, and the pad material 9 is provided with a connection hole whose position matches the fixing hole. Bolts can be passed through the fixing hole and the connection hole, and then used with nuts to connect the lug plate 10 and the pad material 9.

[0048] A bushing-type current transformer 2 typically has two lugs 10, which are located on opposite sides of the bushing-type current transformer 2. Therefore, two pads 9 can be provided and connected to the two lugs 10 respectively.

[0049] like Figure 2 and Figure 3As shown, inside the cabinet 1, with the direction perpendicular to the back panel 8 as the left-right direction, induction copper busbars 4 (phase A), 5 (phase B), and 6 (phase C) are all equipped with induction copper busbars 7. The induction copper busbars 7 of phase A busbar 4 and phase C busbar 6 are in the same vertical plane, and they are set at different heights. Therefore, the bushing-type current transformer 2 corresponding to phase A busbar 4 and the bushing-type current transformer 2 corresponding to phase C busbar 6 are located in the same vertical plane but at different heights. The induction copper busbars 7 of phase B busbar 5 and phase C busbar 6 are located on the same horizontal plane. Since they are arranged in a front-to-back configuration within cabinet 1, the bushing-type current transformer 2 corresponding to phase B busbar 5 and phase C busbar 6 are located on the same horizontal plane but at different front-to-back positions. Phase A busbar 4, phase B busbar 5, and phase C busbar 6 within both cabinets 1 are arranged from left to right. Phase A busbar 4 is located on the far left of its corresponding cabinet 1. Therefore, the bushing-type current transformer 2 corresponding to phase A busbar 4 needs to be spaced a certain distance to the left by the padding material 9 to prevent interference from the phase A busbar 4 in the right-side cabinet 1 during installation. The C-phase busbar 6 is located on the far right of the corresponding cabinet 1. Therefore, the bushing-type current transformer 2 corresponding to the C-phase busbar 6 needs to be pushed to the right by the pad material 9 to ensure that the installation of the bushing-type current transformer 2 is not interfered with by the C-phase busbar 6 in the cabinet 1 on the right. The B-phase busbar 5 is located in the middle of the cabinet 1. The pad material 9 can be located on the left or right side of the back plate 8.

[0050] The shape of the side of the pad material 9 that contacts the bushing current transformer 2 is adapted to the shape of the outer shell of the bushing current transformer 2. If the outer shell of the bushing current transformer 2 is cylindrical, then the shape of the side of the pad material 9 that contacts the bushing current transformer 2 is arc-shaped.

[0051] Example 2:

[0052] This second embodiment provides a compact switchgear using a bushing-type current transformer 2. Unlike the first embodiment, the pad material 9 in this second embodiment includes two forms, namely a first pad material 91 and a second pad material 92.

[0053] like Figure 4As shown, since the bushing-type current transformer 2 requires external wires, an interface 12 for connecting the wires is provided on one side of the ear plate 10. Therefore, when the pad 9 is connected to the ear plate 10, it may obstruct the connection of the wires. This second embodiment addresses the problem of the pad 9 obstructing the connection of the wires. The interfaces 12 of each bushing-type current transformer 2 face the same direction, and all interfaces 12 are located on the same side of the ear plate 10. For example, if the interface 12 of one bushing-type current transformer 2 is located on the left side of the ear plate, then the interfaces 12 of other bushing-type current transformers 2 are also located on the left side of the ear plate, which facilitates the layout of the wire routing and subsequent maintenance.

[0054] like Figure 5 As shown, both the first pad 91 and the second pad 92 are formed by bending sheet metal. Furthermore, both the first pad 91 and the second pad 92 have connecting plates for connecting to the ear plate 10, with connecting holes provided on the connecting plates. The difference between the first pad 91 and the second pad 92 is that the thickness of the first pad 91 is greater than the thickness of the second pad 92, and the thickness difference between the first pad 91 and the second pad 92 is equal to the thickness of the ear plate 10.

[0055] enter Figure 5 As shown, the cross-sectional shape of the first pad 91 and the second pad 92 is U-shaped. This U-shaped cross-section is formed by bending the two sides of the sheet material. The purpose of bending twice is to facilitate the connection of the first pad 91 and the second pad 92 to the back plate 8. The two bends form two folded edges, which are perpendicular to each other. After the first pad 91 and the second pad 92 are connected to the back plate, one folded edge is perpendicular to the back plate 8, and the other folded edge is parallel to the back plate 8. The folded edge parallel to the back plate 8 increases the connection area, allowing holes to be made on this edge so that the back plate 8 can be fixedly connected to the first pad 91 and the second pad 92 using bolts and nuts. It should be noted that the back plate 8 can also be connected to the first pad 91 and the second pad 92 by adhesive bonding or spot welding.

[0056] The two sides of the connecting plate are the inner side and the outer side, respectively. The inner side of the connecting plate of the first pad 91 is connected to the ear plate 10, while the outer side of the connecting plate of the second pad 92 is connected to the ear plate 10.

[0057] It should be noted that the thickness of the first pad 91 and the second pad 92 refers to the height of the first pad 91 and the second pad 92 when the connecting plate is horizontal, and does not refer to the thickness of the plates used for the first pad 91 and the second pad 92.

[0058] like Figure 6As shown, the first pad 91 can have its three sides folded to further increase the connection area between the first pad 91 and the back plate 8, and also to increase the number of connection points with the back plate 8, thereby making the connection between the first pad 91 and the back plate 8 more stable. Similarly, the second pad 92 can also have its three sides folded to improve the stability of the connection between the second pad 92 and the back plate 8.

[0059] As an optional implementation, when the selected bushing-type current transformer 2 has a large external size, the available installation space for the first pad 91 and the second pad 92 is reduced. In this case, the edge of the plate can be bent only once, so that the cross-sectional shape of the first pad 91 and the second pad 92 is U-shaped. The first pad 91 and the second pad 92 are connected to the back plate by welding. This connection method reduces the size of the first pad 91 and the second pad 92, making it easier for the first pad 91 and the second pad 92 to be installed in a smaller space.

Claims

1. A compact switchgear using a bushing-type current transformer (2), characterized in that, The cabinet (1) includes two side walls (3) connected together. The side walls (3) connected to the cabinet (1) are provided with mounting holes. The mounting holes are provided with mounting components. The mounting components are used to fix the bushing-type current transformer (2). The mounting components make the two ends of the bushing-type current transformer (2) located in the two cabinets (1) respectively.

2. A compact switchgear using a bushing-type current transformer (2) according to claim 1, characterized in that, The mounting assembly includes a back plate (8) having a through hole (11) through which a bushing-type current transformer (2) passes, and the bushing-type current transformer (2) is fixed to the back plate (8).

3. A compact switchgear using a bushing-type current transformer (2) according to claim 2, characterized in that, The back plate (8) is fixedly connected to the side wall (3) where the mounting hole is located, and the mounting hole is closed when the back plate (8) is connected to the side wall (3).

4. A compact switchgear using a bushing-type current transformer (2) according to claim 2, characterized in that, The mounting assembly also includes a pad (9), the bushing current transformer (2) is fixedly connected to the pad (9), the pad (9) is fixedly connected to the back plate (8), and the pad (9) is used to change the distance between the bushing current transformer (2) and the side wall (3) where the mounting hole is located.

5. A compact switchgear using a bushing-type current transformer (2) according to claim 4, characterized in that, The bushing current transformer (2) has an ear plate (10) on its side wall (3). The ear plate (10) has a fixing hole. The pad material (9) has a connecting hole corresponding to the fixing hole. The fixing hole and the connecting hole are used for fasteners to connect the bushing current transformer (2) and the pad material (9).

6. A compact switchgear using a bushing-type current transformer (2) according to claim 5, characterized in that, The bushing-type current transformer (2) has ear plates (10) on its opposite sides, and the ear plates (10) on both sides are connected to two pads (9) respectively.

7. A compact switchgear using a bushing-type current transformer (2) according to claim 5, characterized in that, The pad material (9) is a plate with bent edges, and the bent edges of the plate form a three-dimensional structure.

8. A compact switchgear using a bushing-type current transformer (2) according to claim 5, characterized in that, The cabinet (1) is equipped with a three-phase busbar, which includes an A-phase busbar (4), a B-phase busbar (5) and a C-phase busbar (6). Based on the distance between the bushing current transformer (2) and the corresponding two busbars, the bushing current transformer (2) and the corresponding nearest busbar are located on both sides of the back plate (8). A pad (9) is provided between the bushing current transformer (2) and the back plate (8).

9. A compact switchgear using a bushing-type current transformer (2) according to claim 6, characterized in that, The padding material (9) includes a first padding material (91) and a second padding material (92), which are respectively used to connect to the two sides of the ear plate (10) near the back plate (8) and away from the back plate (8).

10. A compact switchgear using a bushing-type current transformer (2) according to claim 9, characterized in that, The ear plate (10) is provided with an interface (12) for connecting external wires, and the interface (12) of each bushing current transformer (2) is located on the same side of the corresponding ear plate (10).

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