Clamping structure of mutual inductor

Abstract

The utility model relates to the field of mutual inductor installation and manufacturing, and particularly provides a mutual inductor clamping structure which comprises an installation long plate and two side clamping units, the side clamping units are detachably connected with the installation long plate, the installation long plate is fixedly arranged in a cabinet body, a mutual inductor is installed on the installation long plate, and the side clamping units are detachably connected with the installation long plate. The two side clamping units clamp the mutual inductor from the side face. According to the utility model, the mutual inductor is clamped by the two clamping units from the side surfaces, so that the side wall of the mutual inductor can be stressed, the suspended part of the mutual inductor is reduced, the gravity center of the whole mutual inductor is closer to the connecting part of the mounting plate, the torque is reduced, the connecting part of the mutual inductor and the long mounting plate is more stable, the mutual inductor can be effectively prevented from shaking, and the service life of the mutual inductor is prolonged. And the current monitoring precision is ensured.

Description

A clamping structure for a current transformer Technical Field

[0001] This utility model relates to the field of current transformer installation and manufacturing, and specifically provides a current transformer clamping structure. Background Technology

[0002] Instrument transformers are divided into voltage transformers and current transformers, with current transformers playing a crucial role in low-voltage switchgear for measuring current, monitoring current stability, and providing protection. Typical current transformers have mounting plates with mounting holes at the bottom. Traditionally, they are installed by bolting the transformer directly onto the side of the switchgear cabinet through these holes. While simple, this method is prone to shaking or tilting when the switchgear cabinet vibrates due to strong winds or earthquakes. This can disrupt the alignment of the transformer's core and windings, affecting magnetic circuit closure and leading to current measurement errors. This is especially problematic for large current transformers, where the center of gravity is too far from the bolt connection point, potentially causing them to wobble or even tip over. Furthermore, with the current market demand for pre-assembled low-voltage switchgear, all switchgear components need to be pre-installed before delivery. This traditional installation method makes current transformers susceptible to shaking or even falling during transport due to cabinet vibrations, resulting in damage. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a clamping structure for the current transformer, thereby enhancing its installation strength and reducing the risk of it swaying or tipping over due to vibrations in the switchgear cabinet.

[0004] The technical solution of this utility model is as follows:

[0005] A current transformer clamping structure includes a mounting plate and two side clamping units. The side clamping units are detachably connected to the mounting plate. The mounting plate is fixedly installed in a cabinet. The current transformer is installed on the mounting plate, and the two side clamping units clamp the current transformer from the side.

[0006] In this scheme, the current transformer is mounted on the cabinet of the switchgear via a mounting plate. Two clamping units clamp the current transformer from the side, so that when the current transformer is vibrated, it can also bear the force because the side wall of the current transformer is clamped. This also reduces the volume of the current transformer suspended in the air, bringing the center of gravity of the entire current transformer closer to the mounting connection, reducing the torque generated by vibration, making the connection between the current transformer and the mounting plate more stable, and preventing the current transformer from shaking.

[0007] Preferably, it also includes a side-pressure unit, which is detachably connected to the mounting plate and presses the current transformer onto the mounting plate from above.

[0008] In this scheme, while the side clamping unit reduces the shaking of the current transformer, the side pressing unit presses the mounting plate of the current transformer onto the mounting plate, which, together with the side clamping unit, restricts the displacement of the current transformer in all directions, further improving the mechanical strength of the current transformer mounted on the mounting plate.

[0009] Preferably, the mounting plate is provided with multiple rows of vertical slots, and the side clamping unit includes a first connecting plate and a clamping plate that are perpendicular to each other. The first connecting plate is provided with a first connecting hole corresponding to the slot, and the clamping plate abuts against the side wall of the current transformer.

[0010] In this scheme, the vertical slots allow the installation height of the current transformer to be adjusted according to the actual situation during installation. At the same time, the side pressure unit connects the first connecting plate to the mounting plate by bolts through the first connecting hole. As long as the connection between the side pressure units on both sides of the current transformer and the mounting plate is stable, the clamping of the current transformer by the two clamping plates can be guaranteed to be stable.

[0011] Preferably, each of the two clamping plates is provided with a tightening mechanism at both ends, which provides a force to bring the two clamping plates closer together. The tightening mechanism allows the two clamping plates to clamp the current transformer with greater force, making the connection of the current transformer more stable.

[0012] Preferably, the side pressure unit includes a pressing plate, which has a second connecting hole corresponding to the strip hole, and the pressing plate is used to press the current transformer.

[0013] Preferably, the side pressing unit further includes a second connecting plate disposed on both sides of the pressing plate. The second connecting plate is provided with a third connecting hole corresponding to the first connecting hole on the first connecting plate of the side clamping unit. The connecting plate presses the mounting plate onto the mounting plate.

[0014] In this scheme, after the side-pressure unit presses down on the mounting plate of the current transformer, it can also press down on the side-clamp unit through the second connecting plate, ensuring the installation strength of the side-clamp unit and further improving the stability of the entire current transformer.

[0015] Preferably, a first notch is provided at both ends of the connection between the first connecting plate and the clamping plate, and a second notch is provided at the connection between the pressing plate and the second connecting plate, so that the side pressing unit can be inserted into the first notch of the side clamping unit through the second notch.

[0016] In this scheme, the side pressure unit and the side clamping unit can achieve mutual positioning after being inserted through notch slots. The two second notch slots on the side pressure unit allow the two side clamping units to be inserted, and there are side pressure units at both ends of the side clamping unit. This makes the distance between the clamping plates of the two side clamping units the distance between the two second notch slots, so as to ensure that the side clamping unit can always clamp the current transformer. Conversely, when the side pressure unit is inserted into the first notch slot, the clamping plate can restrict the upward movement of the side pressure unit, ensuring that the side pressure unit always presses down on the current transformer.

[0017] Preferably, the thickness of the first connecting plate does not exceed the thickness of the current transformer's mounting plate. This design ensures the thickness of the first connecting plate is sufficient to prevent a gap between the pressing plate and the current transformer's mounting plate when the second connecting plate of the side-pressing unit presses against the first connecting plate, allowing the current transformer's mounting plate to move a distance perpendicular to the mounting surface of the mounting plate, thus creating displacement.

[0018] Because cables in low-voltage switchgear are typically bundled along the cabinet and its connecting rods, with very few cable sections suspended in the air, one end of the cable passing through the current transformer usually extends from the mounting plate and passes through the transformer. When the cable is stretched, it is highly susceptible to collision and friction with the inner ring wall of the current transformer. Since the transformer housing is generally made of plastic, excessive stress can easily cause it to crack or wear. To avoid this situation, the clamping plate is provided with an arc-shaped notch, the curvature of which is the same as the inner diameter of the current transformer's annular housing.

[0019] In this solution, by setting an arc-shaped notch on the clamping plate, the clamping plate can hold the current transformer to ensure that the current transformer is installed stably. At the same time, when the cable rubs against the inner diameter of the current transformer housing, it can replace the current transformer housing to contact the cable, so as to avoid damage to the current transformer housing.

[0020] The beneficial effects of this utility model are:

[0021] This invention utilizes two clamping units to clamp the current transformer from the side, allowing the current transformer to bear force from the side wall. This reduces the portion of the current transformer that is suspended, bringing the center of gravity of the entire current transformer closer to the connection point with the mounting plate, reducing torque, and making the connection between the current transformer and the mounting plate more stable, effectively preventing the current transformer from shaking. Furthermore, the side pressing unit presses the mounting plate of the current transformer onto the mounting plate, further improving the mechanical strength of the current transformer. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a schematic diagram of the installation of this utility model;

[0024] Figure 2 is an exploded view of the main components of this utility model;

[0025] Figure 3 is a schematic diagram of the side clamp unit of this utility model;

[0026] Figure 4 is a schematic diagram of the side pressure unit of this utility model.

[0027] In the above figures, the corresponding reference numerals are as follows:

[0028] 1-Mounting plate, 101-Strip hole, 2-Side clamping unit, 201-First connecting plate, 202-Clamping plate, 203-First connecting hole, 204-Tightening mechanism, 205-First notch, 206-Arc-shaped notch, 207-Fastening hole, 3-Side pressing unit, 301-Pressing plate, 302-Second connecting hole, 303-Second connecting plate, 304-Third connecting hole, 305-Second notch, 4-Inductor, 401-Mounting plate, 402-Mounting hole. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of the present invention.

[0030] As shown in Figure 1, a current transformer clamping structure includes a mounting plate 1 and two side clamping units 2. The side clamping units 2 are detachably connected to the mounting plate 1, which is fixedly mounted in the cabinet. The current transformer 4 is mounted on the mounting plate 1, and the two side clamping units 2 clamp the current transformer 4 from the sides. Specifically, the current transformer 4 is still connected to the mounting plate 1 via bolts inserted into the mounting holes 402 on its own mounting plate 401, which is fixedly mounted on the cabinet of the switchgear. The two clamping units, one on the left and one on the right, clamp the current transformer 4 from the sides. When the current transformer 4 is subjected to vibration, the side walls of the current transformer 4 can also bear force, thereby reducing the suspended volume of the current transformer 4 and bringing the center of gravity of the entire current transformer 4 closer to the mounting connection point. This reduces the torque experienced by the current transformer 4 during vibration, making the connection between the current transformer 4 and the mounting plate 1 more stable and preventing the current transformer 4 from shaking.

[0031] Furthermore, in addition to reducing the shaking of the current transformer 4 by the side clamping unit 2, a side pressing unit 3 is also included. The side pressing unit 3 is detachably connected to the mounting plate 1, and presses the current transformer 4 onto the mounting plate 1 from above the mounting plate 401. The side pressing plate, together with the side clamping unit 2, restricts the displacement of the current transformer 4 in all directions, further improving the mechanical strength of the current transformer 4 mounted on the mounting plate 1.

[0032] Example 1:

[0033] This embodiment provides a specific structure of a side clamping unit 2, as shown in Figures 1 to 3. The side clamping unit 2 includes a first connecting plate 201 and a clamping plate 202 that are perpendicular to each other. The first connecting plate 201 is provided with a first connecting hole 203 corresponding to the slot 101. The clamping plate 202 abuts against the side wall of the current transformer 4. The mounting plate 1 can be fixedly installed on the connecting rod or side wall of the switch cabinet by bolt connection. The mounting plate 1 is provided with multiple rows of vertical slots 101, preferably three rows of vertical slots 101, and the slots 101 are evenly spaced.

[0034] It should be noted that the current transformer 4 adapted in this embodiment is a current transformer 4 with a mounting plate 401 at the bottom, and the mounting plate 401 is located directly below the current transformer 4 with mounting holes 402 at both ends of the mounting plate 401, as shown in Figure 2. Based on this, the mounting holes 402 on the mounting plate 401 of the current transformer 4 are aligned with the middle row of three vertical slots 101, and conventional installation is performed using bolts and nuts. The first connecting holes 203 on the first connecting plates 201 of the two side clamping units 2 are respectively aligned with the two outer rows of vertical slots 101 for bolt and nut connection. At this time, the clamping plates 202 of the two side clamping units 2 just press the current transformer 4 in the middle. Of course, the vertical slot 101 allows the installation height of the current transformer 4 to be adjusted according to the actual situation during installation. At the same time, the side pressure unit 3 is bolted to the first connecting plate 201 on the mounting plate 1 through the first connecting hole 203. As long as the connection between the side pressure unit 3 on both sides of the current transformer 4 and the mounting plate 1 is stable, the two clamping plates 202 can be used to clamp the current transformer 4 stably.

[0035] Furthermore, each end of the two clamping plates 202 is provided with a tightening mechanism 204, which provides a force to bring the two clamping plates 202 closer together. In this embodiment, the tightening mechanism 204 includes fastening holes 207 at both ends of the clamping plates 202 and two tension springs. The two ends of the tension springs are respectively connected to the fastening holes 207 of the two clamping plates 202, allowing the two clamping plates 202 to tend to move closer together, so as to better clamp the current transformer 4. Of course, the tightening mechanism 204 may also include fastening holes 207 at both ends of the clamping plates 202. By inserting bolts and nuts into the fastening holes 207 and tightening the nuts or bolts, the current transformer 4 is directly clamped, ensuring that the current transformer 4 will not shake after installation.

[0036] Furthermore, since cables in low-voltage switchgear are generally bundled along the cabinet walls and connecting rods within the cabinet, with very few cable segments suspended in the air, one end of the cable passing through the current transformer 4 typically extends from the mounting plate 1 and passes through the current transformer 4. When the cable is pulled, it is highly susceptible to collision and friction with the inner annular wall of the current transformer 4. Since the casing of the current transformer 4 is generally made of plastic, excessive force can easily cause cracking or wear. To avoid this, the clamping plate 202 is provided with an arc-shaped notch 206, the curvature of which is the same as the inner diameter of the annular casing of the current transformer 4. By providing an arc-shaped notch 206 on the clamping plate 202, the clamping plate 202 secures the current transformer 4, ensuring its stable installation. Simultaneously, when the cable rubs against the inner diameter of the current transformer 4 casing, the notch replaces the casing of the current transformer 4 in contact with the cable, reducing the force of the cable on the casing and preventing damage to the casing of the current transformer 4.

[0037] Example 2:

[0038] Based on Embodiment 1, this embodiment provides a specific side-pressure unit 3 to prevent the current transformer 4 from shaking, using the side-pressure unit 3. As shown in Figure 4, the side-pressure unit 3 includes a pressing plate 301, on which a second connecting hole 302 corresponding to the strip hole 101 is provided. The pressing plate 301 is used to press the current transformer 4. The side-pressure unit 3 also includes second connecting plates 303 disposed on both sides of the pressing plate 301. The second connecting plates 303 are provided with third connecting holes 304 corresponding to the first connecting holes 203 on the first connecting plate 201 of the side clamping unit 2. The connecting plates press the mounting plate 401 onto the mounting plate 1.

[0039] Specifically, as shown in Figure 2, based on the current transformer 4 used in Embodiment 1, side clamp units 2 are provided on both the left and right sides of the current transformer 4. Therefore, second connecting plates 303 are provided on both the left and right sides of the pressing plate 301. The second connecting plate 303 covers the first connecting plate 201, and the third connecting hole 304 on the second connecting plate 303 is coaxially aligned with the first connecting hole 203 on the first connecting plate 201. The same bolt can connect the side clamp unit 2, the side pressing unit 3, and the mounting plate 1 simultaneously. Furthermore, when the side pressing unit 3 is installed, the second connecting hole 302 on its pressing plate 301 is also coaxially aligned with the mounting hole 402 on the mounting plate 401 of the current transformer 4. After the side pressing unit 3 presses down on the mounting plate 401 of the current transformer 4, it can also press down on the side clamp unit 2 together through the second connecting plate 303, ensuring the installation strength of the side clamp unit 2 and further improving the stability of the entire current transformer 4.

[0040] Furthermore, a first notch 205 is provided at both ends of the connection between the first connecting plate 201 and the clamping plate 202, and a second notch 305 is provided at the connection between the pressing plate 301 and the second connecting plate 303. The side pressing unit 3 can be inserted into the first notch 205 of the side clamping unit 2 through the second notch 305. After the side pressing unit 3 and the side clamping unit 2 are inserted through the notch, they can achieve mutual positioning. The two second notches 305 on the side pressing unit 3 allow the two side clamping units 2 to be inserted, and there are side pressing units 3 at both ends of the side clamping unit 2. This makes the distance between the clamping plates 202 of the two side clamping units 2 the distance between the two second notches 305, so as to ensure that the side clamping unit 2 can always clamp the current transformer 4. On the other hand, when the side pressing unit 3 is inserted into the first notch 205, the clamping plate 202 can restrict the upward movement of the side pressing unit 3, ensuring that the side pressing unit 3 always presses down on the current transformer 4.

[0041] It should be noted that the thickness of the first connecting plate 201 does not exceed the thickness of the mounting plate 401 of the current transformer 4. Ensuring the thickness of the first connecting plate 201 prevents a gap between the pressing plate 301 and the mounting plate 401 of the current transformer 4 when the second connecting plate 303 of the side pressing unit 3 presses against the first connecting plate 201, thus preventing the mounting plate 401 of the current transformer 4 from having a displacement distance in the direction perpendicular to the mounting surface of the mounting plate 1.

[0042] In this embodiment, a preferred reinforcement method for the current transformer 4 is as follows: First, the mounting plate 1 is vertically set at the specified position in the switchgear. After determining the installation height of the current transformer 4, the high-position side clamping unit 2 is first installed on the mounting plate 401 of the current transformer 4 by bolts using the pressing plate 301. Then, after aligning the vertical strip hole 101 in the middle of the mounting plate 1, it is hung on the mounting plate 1. At this time, the side clamping unit 3 is not yet tightened by bolts. Then, the two side clamping units 2 are aligned with the outer vertical strip hole 101 respectively, so that the first notch 205 and the second notch 305 are engaged with each other. The second connecting plate 303 of the side clamping unit 3 is placed above the first connecting plate 201 of the side clamping unit 2. The first connecting hole 203 and the third connecting hole 304 are aligned and bolts are inserted. Then, the low-position side clamping unit 2 is installed, paying attention to the engagement of the notch. Then, all bolts are tightened in sequence. Finally, the clamping plates 202 of the two side clamping units 2 are tightened by long bolts to complete the clamping installation of the current transformer 4. Alternatively, the mounting plate 1 can be placed horizontally, and after all the current transformers 4 are installed, the horizontal plate can be vertically installed in the designated position in the switch cabinet.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A locking structure for a current transformer, characterized in that, It includes a mounting plate (1) and two side clamping units (2), the side clamping units (2) being detachably connected to the mounting plate (1), the mounting plate (1) being fixedly installed in the cabinet, the current transformer (4) being installed on the mounting plate (1), and the two side clamping units (2) clamping the current transformer (4) from the side.

2. The clamping structure of a transformer according to claim 1, wherein It also includes a side pressure unit (3), which is detachably connected to the mounting plate (1). The side pressure unit (3) presses the current transformer (4) onto the mounting plate (1) from above the mounting plate (401) of the current transformer (4).

3. The clamping structure of a transformer according to claim 2, wherein The mounting plate (1) is provided with multiple rows of vertical slots (101). The side clamping unit (2) includes a first connecting plate (201) and a clamping plate (202) that are perpendicular to each other. The first connecting plate (201) is provided with a first connecting hole (203) corresponding to the slot (101). The clamping plate (202) abuts against the side wall of the current transformer (4).

4. The clamping structure of a transformer according to claim 3, wherein The two clamping plates (202) are provided with tightening mechanisms (204) at their respective ends, and the tightening mechanisms (204) provide a force to bring the two clamping plates (202) closer together.

5. The clamping structure of a transformer according to claim 3, wherein The side pressure unit (3) includes a pressing plate (301), on which a second connecting hole (302) corresponding to the strip hole (101) is provided, and the pressing plate (301) is used to press the current transformer (4).

6. The clamping structure of a transformer according to claim 5, wherein The side pressing unit (3) further includes a second connecting plate (303) disposed on both sides of the pressing plate (301). The second connecting plate (303) is provided with a third connecting hole (304) corresponding to the first connecting hole (203) on the first connecting plate (201) of the side clamping unit (2). The connecting plate presses the mounting plate (401) onto the mounting long plate (1).

7. The clamping structure of a transformer according to claim 6, wherein The first connecting plate (201) and the clamping plate (202) are provided with first notch grooves (205) at both ends of the connection, and the pressing plate (301) and the second connecting plate (303) are provided with second notch grooves (305). The side pressing unit (3) can be inserted into the first notch groove (205) of the side clamping unit (2) through the second notch groove (305).

8. A locking structure for a current transformer according to any one of claims 3 to 7, characterized in that, The thickness of the first connecting plate (201) does not exceed the thickness of the mounting plate (401) of the current transformer (4).

9. The locking structure for a current transformer according to claim 8, characterized in that, The clamping plate (202) is provided with an arc-shaped notch (206), and the arc of the arc-shaped notch (206) is the same as the inner diameter of the annular shell of the current transformer (4).

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