Open-close type current transformer

Abstract

The utility model discloses an open-close type current transformer which comprises a transformer body, the transformer body is composed of a first transformer body and a second transformer body, and connecting positions are arranged at the connecting positions of the first transformer body and the second transformer body. The first mutual inductor and the second mutual inductor are connected through a connecting block arranged on the connecting position, a fixing device is clamped on the outer wall of the first mutual inductor and the outer wall of the second mutual inductor in a wrapping mode, and the fixing device is matched with the connecting block to achieve fixation. In combination with the structural design of the utility model, on one hand, the installation speed of the mutual inductor is greatly improved, and on the other hand, the disadvantage of unstable disassembly error caused by the fact that a traditional open-close type current mutual inductor is installed and fixed by adopting a ribbon or a screw is avoided; therefore, the measurement precision and stability of the open-close type current transformer are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to an open-type current transformer. Background Technique

[0002] A current transformer is an instrument that measures by converting a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary-side winding has very few turns and is connected in series in the circuit where the current needs to be measured. Therefore, it often has the full current of the circuit flowing through it. The secondary-side winding has more turns and is connected in series in the measuring instrument and the protection circuit. When the current transformer is working, its secondary-side circuit is always closed. Therefore, the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit. A current transformer converts a large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be open-circuited.

[0003] Currently, the installation and fixation methods of open-type current transformers on the market often use cable ties or screws for installation and fixation. These two installation methods are very inconvenient first of all, but the biggest problem is that the error of the current transformer changes every time it is installed and disassembled. Because the iron core of the current transformer is very unstable after being cut, the magnetic permeability will change due to the change of external pressure. However, once the magnetic permeability changes, the error of the open-type current transformer will change. When the open-type current transformer leaves the factory, the operator assembles the current transformer and conducts an error test. After passing the test, it leaves the factory. However, when the installation and use personnel are on-site, it is impossible to use the same force for fixing with cable ties or screws. Once the force changes, the error of the current transformer will also change. Summary of the Invention

[0004] The purpose of the utility model is to provide a current transformer to solve the problem mentioned in the above background technique that the installation and fixation methods of open-type current transformers on the market often use cable ties or screws for installation and fixation. These two installation methods are very inconvenient first of all, but the biggest problem is that the error of the current transformer changes every time it is installed and disassembled. Because the iron core of the current transformer is very unstable after being cut, the magnetic permeability will change due to the change of external pressure. However, once the magnetic permeability changes, the error of the open-type current transformer will change. When the open-type current transformer leaves the factory, the operator assembles the current transformer and conducts an error test. After passing the test, it leaves the factory. However, when the installation and use personnel are on-site, it is impossible to use the same force for fixing with cable ties or screws. Once the force changes, the error of the current transformer will also change.

[0005] To achieve the above object, the present utility model provides the following technical solution: An opening and closing type current transformer, comprising a transformer body, the transformer body is composed of a first transformer and a second transformer, the first transformer and the second transformer are symmetrically designed, connection positions are provided at the connection parts of the first transformer and the second transformer, the first transformer and the second transformer are connected through connection blocks arranged at the connection positions, a fixing device is clamped outside the first transformer and the second transformer, and the fixing device is fixed through cooperation with the connection blocks.

[0006] Preferably, a plurality of fixing blocks are fixedly connected to the outer wall surfaces of the first transformer and the second transformer, and a clamping block is fixedly connected to the surface of the connection position.

[0007] Preferably, a clamping interface adapted to the clamping block is provided on the surface of the connection block, and the clamping block is clamped in the clamping interface.

[0008] Preferably, the fixing device comprises a fixing belt and a fixing component, one end of the fixing belt is fixedly connected with the fixing component, the inner wall of the fixing belt is in contact with the outer walls of the first transformer and the second transformer, the other end of the fixing belt is fixedly connected with an upwardly bent connection hook, and the connection hook is connected and fixed through cooperation with the fixing component.

[0009] Preferably, the fixing component comprises a fixing seat and a connection ring, the fixing seat is rotatably connected to one end of the fixing belt through a pin shaft, connection holes are symmetrically provided on the outer wall surface of the fixing seat, one end of the connection ring is rotatably connected in the connection hole, and the other end of the connection ring is movably connected to the inner wall of the connection hook.

[0010] Preferably, fixing openings are provided on the surface of the fixing belt at positions opposite to the fixing blocks, and the fixing blocks are clamped in the fixing openings, the fixing openings are adapted to the fixing blocks, and limiting openings are provided on the surface of the fixing belt at positions opposite to the connection blocks.

[0011] Preferably, limiting blocks are fixedly connected to both sides of the top surface of the connection block, and the outer walls of the limiting blocks are abutted against the inner walls of the limiting openings.

[0012] Preferably, notches are provided on both sides of the outer wall of the connection block.

[0013] Beneficial effects

[0014] Compared with the existing technology, the beneficial effects of the present utility model are:

[0015] Combined with the structural design of the present utility model, one end of the fixing strap is rotatably connected by a pin shaft through a fixing seat, and the connecting ring on the fixing seat and the connecting hook at the other end are snap-connected through a buckle. On the one hand, this greatly improves the installation speed of the current transformer. On the other hand, it also avoids the drawback of unstable disassembly errors caused by using cable ties or screws for installation and fixation in traditional split-type current transformers, thereby improving the measurement accuracy and stability of the split-type current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the cooperative structure of the first current transformer and the second current transformer of the present utility model

[0018] Figure 3 is a schematic diagram of the structure of the fixing device of the present utility model.

[0019] 1. Current transformer body; 2. First current transformer; 3. Second current transformer; 4. Fixing device; 5. Connection position;

[0020] 6. Connection block; 7. Clamping block; 8. Fixing block; 41. Fixing strap; 42. Fixing component; 43. Connecting hook;

[0021] 44. Fixing port; 45. Limiting port; 61. Clamping interface; 62. Limiting block; 63. Notch; 421. Fixing seat;

[0022] 422. Connecting ring; 423. Pin shaft; 424. Connecting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] As Figures 1-3 Figures 1-3 is a schematic structural view of an opening and closing current transformer according to a preferred embodiment of the present invention. In this embodiment, an opening and closing current transformer includes a transformer body 1, and the transformer body 1 is composed of a first transformer 2 and a second transformer 3. The first transformer 2 and the second transformer 3 are symmetrically designed. Connecting positions 5 are provided at the connection parts of the first transformer 2 and the second transformer 3. The first transformer 2 and the second transformer 3 are connected through a connecting block 6 arranged at the connecting position 5. A fixing device 4 is clamped on the outer walls of the first transformer 2 and the second transformer 3, and the fixing device 4 is fixed by cooperating with the connecting block 6. With the above structural design, on the one hand, the installation speed of the transformer is greatly improved. On the other hand, it also avoids the drawback of unstable disassembly error caused by using cable ties or screws for installation and fixation in traditional opening and closing current transformers, thereby improving the measurement accuracy and stability of the opening and closing current transformer.

[0026] In this embodiment, a plurality of fixing blocks 8 are fixedly connected to the outer wall surfaces of the first transformer 2 and the second transformer 3, a clamping block 7 is fixedly connected to the surface of the connecting position 5, and a clamping interface 61 adapted to the clamping block 7 is provided on the surface of the connecting block 6. The clamping block 7 is clamped in the clamping interface 61, so as to realize the connection positioning between the first transformer 2 and the second transformer 3, and ensure the error situation of the connection between the first transformer 2 and the second transformer 3 through the cooperation between the clamping interface 61 and the clamping block 7.

[0027] In this embodiment, the fixing device 4 includes a fixing belt 41 and a fixing component 42. One end of the fixing belt 41 is fixedly connected with the fixing component 42. The inner wall of the fixing belt 41 is in contact with the outer walls of the first transformer 2 and the second transformer 3. The other end of the fixing belt 41 is fixedly connected with an upwardly bent connecting hook 43, and the connecting hook 43 is connected and fixed by cooperating with the fixing component 42. And the fixing component 42 includes a fixing seat 421 and a connecting ring 422. The fixing seat 421 is rotatably connected to one end of the fixing belt 41 through a pin shaft 423. Connecting holes 424 are symmetrically provided on the outer wall surface of the fixing seat 421. One end of the connecting ring 422 is rotatably connected in the connecting holes 424, and the other end of the connecting ring 422 is movably connected with the inner wall of the connecting hook 43. With the above structural design, its principle is that one end of the fixing belt 41 is rotatably connected by using the fixing seat 421 through the pin shaft 423, and the connecting ring 422 on the fixing seat 421 and the connecting hook 43 at the other end are buckled and connected through a buckle, greatly improving the installation speed of the transformer.

[0028] In this embodiment, a fixing opening 44 is formed on the surface of the fixing belt 41 at a position opposite to the fixing block 8, and the fixing block 8 is clamped in the fixing opening 44. The fixing opening 44 is adapted to the fixing block 8. A limiting opening 45 is formed on the surface of the fixing belt 41 at a position opposite to the connecting block 6. On the top surface of the connecting block 6, limiting blocks 62 are fixedly connected on both sides of the clamping interface 61. The outer wall of the limiting block 62 abuts against the inner wall of the limiting opening 45. With the above structural design, the stability of the fixing belt 41 clamping the current transformer body 1 is effectively assisted, and the drawback that the fixing belt 41 moves along the outer wall of the current transformer body 1 to affect the current transformer body 1 and cause error instability is avoided, and the measurement accuracy and stability of the split-type current transformer are reduced.

[0029] In this embodiment, notches 63 are formed on both sides of the outer wall of the connecting block 6. With this structural design, it is convenient for the user to pick out the connecting block 6 during the disassembly process when maintaining the current transformer body 1, so as to disassemble the first current transformer 2 and the second current transformer 3. At the same time, with this design, the connecting block 6 can be reused to connect and fix the first current transformer 2 and the second current transformer 3.

[0030] The above content further elaborates on the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. An opening and closing type current transformer, comprising a transformer body (1), wherein the transformer body (1) is composed of a first transformer (2) and a second transformer (3), and the first transformer (2) and the second transformer (3) are symmetrically designed, characterized in that: Connection positions (5) are provided at the connection points between the first mutual inductor (2) and the second mutual inductor (3). The first mutual inductor (2) and the second mutual inductor (3) are connected through a connection block (6) provided at the connection position (5), and a fixing device (4) is clamped on the outer walls of the first mutual inductor (2) and the second mutual inductor (3), and the fixing device (4) is fixed by cooperating with the connection block (6).

2. The split type current transformer according to claim 1, wherein: A plurality of fixing blocks (8) are fixedly connected to the outer wall surfaces of the first mutual inductor (2) and the second mutual inductor (3), etc., and a clamping block (7) is fixedly connected to the surface of the connection position (5).

3. The split type current transformer according to claim 1, characterized in that: A clamping interface (61) adapted to the clamping block (7) is provided on the surface of the connection block (6), and the clamping block (7) is clamped in the clamping interface (61).

4. The split type current transformer according to claim 1, characterized in that: The fixing device (4) includes a fixing belt (41) and a fixing component (42). One end of the fixing belt (41) is fixedly connected to the fixing component (42). The inner wall of the fixing belt (41) is in contact with the outer walls of the first mutual inductor (2) and the second mutual inductor (3). The other end of the fixing belt (41) is fixedly connected to an upwardly bent connection hook (43), and the connection hook (43) cooperates with the fixing component (42) to achieve connection and fixation.

5. The split-type current transformer according to claim 4, characterized in that: The fixing component (42) includes a fixing seat (421) and a connection ring (422). The fixing seat (421) is rotatably connected to one end of the fixing belt (41) through a pin shaft (423). Connection holes (424) are symmetrically provided on the outer wall surface of the fixing seat (421). One end of the connection ring (422) is rotatably connected in the connection hole (424), and the other end of the connection ring (422) is movably connected to the inner wall of the connection hook (43).

6. The opening and closing type current transformer according to claim 5, characterized in that: Fixing openings (44) are provided on the surface of the fixing belt (41) at positions opposite to the fixing blocks (8), and the fixing blocks (8) are clamped in the fixing openings (44). The fixing openings (44) are adapted to the fixing blocks (8). Limiting openings (45) are provided on the surface of the fixing belt (41) at positions opposite to the connection blocks (6).

7. The split-type current transformer according to claim 3, characterized in that: Limiting blocks (62) are fixedly connected to both sides of the top surface of the connection block (6) on both sides of the clamping interface (61), and the outer walls of the limiting blocks (62) are in mutual abutment with the inner walls of the limiting openings (45).

8. The opening and closing type current transformer according to claim 7, wherein: Notches (63) are provided on both sides of the outer wall of the connection block (6).

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