Current transformer

Abstract

The utility model belongs to the technical field of current transformers, and particularly relates to a current transformer which comprises a shell, an iron core assembly body, a mounting base, a primary wiring terminal and a secondary wiring box, and the secondary wiring box comprises a box body arranged on the shell; the secondary wiring terminal is mounted on the box body, connected with the iron core assembly body and used for being connected with an external circuit; the protective cover is mounted on the box body, and a wire outlet groove and a clamping groove are formed in the protective cover; one end of the fixing belt is rotatably arranged in the protective cover, and the other end of the fixing belt extends out through the clamping groove; a clamping convex block is arranged on the fixing belt and abuts against the outer wall of the protective cover; the secondary wiring terminal has the beneficial effects that when the connecting wire is touched by an external object and pulled, the fixing belt clamps the connecting wire to limit the movement of the connecting wire, so that the connecting part of the connecting wire and the secondary wiring terminal is effectively prevented from loosening, the open circuit condition is prevented, and the use safety is improved.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, and in particular relates to a current transformer. Background Technology

[0002] Current transformers are an indispensable key device in power systems. Their purpose is to accurately and proportionally transform current for measurement and protection.

[0003] Currently, current transformers typically include primary side current terminals and secondary side current terminals. The primary side current terminals are used to connect to the primary circuit or main circuit, allowing the monitored main circuit current to flow completely through the current transformer, thereby generating a proportionally reduced current signal on the secondary side through electromagnetic induction. The secondary side current terminals are used to connect to the secondary circuit or control circuit, providing a unified, standardized, and safe input signal for measurement, metering, monitoring, and protection equipment.

[0004] Since the secondary circuit must be kept closed at all times, open circuits on the secondary side are strictly prohibited. In the existing technology, most current transformers do not have a wire fixing structure installed at the secondary current terminal after the wire connection is completed. This may result in external objects accidentally touching the wire, causing the connection between the wire and the secondary current terminal to become loose, which poses a certain safety hazard. Utility Model Content

[0005] The purpose of this invention is to provide a current transformer to address the aforementioned technical problems.

[0006] In view of this, the present invention provides a current transformer, including a housing, a core assembly, a mounting base, primary terminals, and a secondary junction box. The core assembly is disposed inside the housing, the mounting base is disposed at the bottom of the housing, the primary terminals are disposed at the top of the housing and connected to the core assembly, and the secondary junction box is disposed on the side of the housing and connected to the core assembly. The secondary junction box includes:

[0007] The box body is mounted on the outer shell;

[0008] Secondary wiring terminals are installed on the housing and connected to the iron core assembly for connecting external circuits.

[0009] The protective cover is installed on the box body and has a cable outlet groove and a snap-fit ​​groove.

[0010] A fixing strap, one end of which is rotatably installed inside the protective cover, and the other end protruding through a snap-fit ​​groove;

[0011] The fixing strap is equipped with a snap-fit ​​protrusion that abuts against the outer wall of the protective cover.

[0012] Furthermore, there are several snap-fit ​​bumps, and these snap-fit ​​bumps are arranged in a linear array.

[0013] Furthermore, abutting protrusion is provided on the side of the fixing strip closest to the wire.

[0014] Furthermore, there are several abutting protrusions, and these abutting protrusions are arranged in a linear array.

[0015] Furthermore, the protective cover is fixed to the box body by fasteners.

[0016] Furthermore, a limiting boss is provided on the box body.

[0017] Furthermore, the mounting base is provided with a slot, and the bottom of the housing has a plug that is adapted to fit into the slot.

[0018] The beneficial effects of this utility model are:

[0019] When the connecting wire is touched and pulled by an external object, the fixing strap clamps the connecting wire to restrict its movement, thereby effectively preventing the connection between the connecting wire and the secondary terminal from becoming loose, preventing the circuit from opening, and improving safety. Attached Figure Description

[0020] Figure 1 This is an exploded view of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the protective cover of this utility model;

[0022] Figure 3 This is a structural schematic diagram of the protective cover of this utility model from another perspective;

[0023] Figure 4 This is a cross-sectional view of the internal structure of the secondary junction box of this utility model;

[0024] The markings in the diagram are as follows:

[0025] 1. Outer shell; 11. Insert block; 2. Mounting base; 21. Slot; 3. Primary wiring terminal; 4. Box body; 41. Limiting boss; 5. Secondary wiring terminal; 6. Protective cover; 61. Cable outlet groove; 62. Snap-fit ​​groove; 7. Fixing strap; 71. Snap-fit ​​protrusion; 72. Abutment protrusion. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] Example 1:

[0029] This embodiment provides a current transformer, including a housing 1, a core assembly, a mounting base 2, a primary terminal block 3, and a secondary junction box. The core assembly is disposed inside the housing 1, the mounting base 2 is disposed at the bottom of the housing 1, the primary terminal block 3 is disposed at the top of the housing 1 and connected to the core assembly, and the secondary junction box is disposed on the side of the housing 1 and connected to the core assembly. The secondary junction box includes:

[0030] Box 4 is mounted on the outer shell 1;

[0031] Secondary wiring terminal 5 is installed on the housing 4 and connected to the iron core assembly, and is used to connect to external circuits;

[0032] The protective cover 6 is installed on the box body 4, and the protective cover 6 has a cable outlet groove 61 and a snap-fit ​​groove 62.

[0033] The fixing strap 7 has one end rotatably disposed inside the protective cover 6, and the other end extends out through the snap-fit ​​groove 62;

[0034] The fixing strap 7 is provided with a snap-fit ​​protrusion 71, which abuts against the outer wall of the protective cover 6.

[0035] In this technical solution, the current transformer is fixedly connected to the electrical cabinet via the mounting base 2. The specific installation connection and wiring of the current transformer are existing publicly available technologies and will not be described in detail here. The secondary wiring terminal 5 is exposed outside the box 4. After the wiring is completed, the protective cover 6 is placed on the box 4. The outlet groove 61 and the snap-fit ​​groove 62 on the protective cover 6 form an outlet hole and a snap-fit ​​hole with the top end face of the box 4, respectively. The protective cover 6 is made of transparent plastic, which has an insulating effect and facilitates observation of the wiring inside the protective cover 6. The connecting wire is discharged from the outlet hole. One end of the fixing strap 7 is hinged to the inside of the protective cover 6, while the other end of the fixing strap 7 extends from the snap-fit ​​hole. At the same time, the fixing strap 7 is positioned above the connecting wire. By pulling out the end of the fixing strap 7, the fixing strap 7 moves down and approaches the connecting wire. The fixing strap 7 abuts against the connecting wire in the Z direction and cooperates with the end face of the box 4 to clamp and fix the connecting wire. The fixing strap 7 is made of plastic and has an insulating function. An integrally connected snap-fit ​​protrusion 71 is provided on the fixing strap 7. The snap-fit ​​protrusion 71 has a certain elasticity and is provided with an inclined surface. When the end of the fixing strap 7 is pulled out from the snap-fit ​​hole, the snap-fit ​​protrusion 71 is squeezed by the snap-fit ​​hole wall and moves together with the fixing strap 7 to the outside of the protective cover 6. When the snap-fit ​​protrusion 71 is located outside the protective cover 6, the snap-fit ​​protrusion 71 abuts against the outer wall of the protective cover 6, restricting the fixing strap 7 from retracting into the protective cover 6, thereby ensuring that the fixing strap 7 can press the connecting wire tightly.

[0036] Through the above structural design, when the connecting wire is touched and pulled by an external object, the fixing band 7 clamps the connecting wire and restricts its movement, thereby effectively preventing the connection between the connecting wire and the secondary terminal 5 from becoming loose, preventing the circuit from opening, and improving the safety of use.

[0037] Example 2:

[0038] This embodiment provides a current transformer, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0039] Furthermore, there are several snap-fit ​​protrusions 71, and these snap-fit ​​protrusions 71 are arranged in a linear array.

[0040] In this technical solution, the pull-out length of the fixing strap 7 can be adjusted through this structural design, thereby allowing the distance between the fixing strap 7 and the box 4 to be adjusted, thus satisfying the need to achieve a clamping effect on connecting wires of different thicknesses, which is highly practical.

[0041] Example 3:

[0042] This embodiment provides a current transformer, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0043] Furthermore, the fixing strip 7 is provided with an abutting protrusion 72 on the side near the wire.

[0044] In this technical solution, the abutting protrusion 72 is integrally connected to the fixing band 7. By setting the abutting protrusion 72, the squeezing effect of the fixing band 7 on the connecting wire can be enhanced, improving the clamping effect on the connecting wire. Furthermore, there are several abutting protrusions 72, and these several abutting protrusions 72 are arranged in a linear array. Through this structural design, the clamping effect on the connecting wire is further enhanced.

[0045] Example 4:

[0046] This embodiment provides a current transformer, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0047] Furthermore, the protective cover 6 is connected and fixed to the box body 4 by fasteners.

[0048] In this technical solution, a connecting hole is provided on the housing 4, and a mounting hole extending along the Z direction is provided on the protective cover 6. A screw is threaded through the mounting hole and connected to the connecting hole to achieve a fixed connection between the protective cover 6 and the housing 4. This structural design facilitates the disassembly and replacement of the protective cover 6, making maintenance easier.

[0049] Furthermore, a limiting boss 41 is provided on the box body 4. Through this structural design, the protective cover 6 is fitted onto the limiting boss 41 of the box body 4, which has a positioning effect on the installation of the protective cover 6 and improves the ease of installation of the protective cover 6.

[0050] Example 5:

[0051] This embodiment provides a current transformer, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0052] Furthermore, the mounting base 2 is provided with a slot 21, and the bottom of the housing 1 has a plug block 11 that is adapted to be inserted into the slot 21.

[0053] In this technical solution, the mounting base 2 and the outer shell 1 are connected by fasteners, and the plug 11 is adapted to the slot 21 for insertion, which plays a positioning role in fixing the connection between the mounting base 2 and the outer shell 1. This increases the stability of the connection between the mounting base 2 and the outer shell 1, while also improving the ease of installation between the mounting base 2 and the outer shell 1.

[0054] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A current transformer, comprising a housing (1), a core assembly, a mounting base (2), a primary terminal block (3), and a secondary junction box, wherein the core assembly is disposed inside the housing (1), the mounting base (2) is disposed at the bottom of the housing (1), the primary terminal block (3) is disposed at the top of the housing (1) and connected to the core assembly, and the secondary junction box is disposed on the side of the housing (1) and connected to the core assembly, characterized in that, The secondary junction box includes: Box body (4), said box body (4) is disposed on outer shell (1); Secondary wiring terminal (5), which is installed on the box (4) and connected to the iron core assembly, is used to connect external circuits; The protective cover (6) is installed on the box body (4), and the protective cover (6) is provided with a wire outlet groove (61) and a snap-fit ​​groove (62). A fixing strap (7) is provided, one end of which is rotatably disposed inside the protective cover (6), and the other end extends out through the snap-fit ​​groove (62); The fixing strap (7) is provided with a snap-fit ​​protrusion (71), which abuts against the outer wall of the protective cover (6).

2. A current transformer according to claim 1, characterized in that, There are several snap-fit ​​protrusions (71), and the several snap-fit ​​protrusions (71) are arranged in a linear array.

3. A current transformer according to claim 1, characterized in that, The fixing strip (7) is also provided with an abutting protrusion (72) on the side near the wire.

4. A current transformer according to claim 3, characterized in that, There are several abutting protrusions (72), and the several abutting protrusions (72) are arranged in a linear array.

5. A current transformer according to claim 1, characterized in that, The protective cover (6) is connected and fixed to the box body (4) by fasteners.

6. A current transformer according to claim 5, characterized in that, The box body (4) is provided with a limiting boss (41).

7. A current transformer according to claim 1, characterized in that, The mounting base (2) is provided with a slot (21), and the bottom of the outer shell (1) has a plug (11) that is adapted to be inserted into the slot (21).

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