External protection type current transformer

Abstract

The utility model relates to the technical field of current transformers, in particular to an external protection type current transformer which comprises a transformer body, the transformer body comprises a bottom plate, and the upper surface of the bottom plate is fixedly connected with a current transformer body. According to the utility model, through the arrangement of the fixing frame and the protection frame, the terminal can be protected and can be prevented from being exposed outside, so that the influence of the outside on the terminal can be reduced, and the use of the terminal and the safety of the current transformer body can be guaranteed; the protection frame and the fixing frame are convenient to fix and take down, the cable and the terminal can be conveniently connected, meanwhile, through the arrangement of the through groove and the arrangement of the first rubber pad, after the cable and the terminal are connected, the cable can be clamped on the inner side of the through groove and wrapped by the first rubber pad, the cable is not prone to being pulled, and the service life of the cable is prolonged. The connection stability of the cable and the terminal can be guaranteed, and the falling risk can be reduced.

Description

Technical Field

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

[0002] A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction, and 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 to be measured passes through. 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. The 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. Current transformers are usually used in transmission lines, power plants, substations, buildings and industrial fields.

[0003] In the prior art, when using a current transformer, it is usually necessary to connect a cable to the lead terminal outside the current transformer. Since the terminal is generally exposed, after connecting the cable and the terminal, the cable cannot be fixed well. When an external force pulls the cable, the cable is likely to fall off, thus the stability of the connection cannot be well guaranteed. Therefore, in order to solve the above problems, an external protection type current transformer is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide an external protection type current transformer to solve the problem mentioned in the above background technique that since the terminal is generally exposed, after connecting the cable and the terminal, the cable cannot be fixed well. When an external force pulls the cable, the cable is likely to fall off, thus the stability of the connection cannot be well guaranteed.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an external protection type current transformer, including a body, the body includes a bottom plate, the upper surface of the bottom plate is fixedly connected with a current transformer body, and terminals are arranged on the surface of the current transformer body;

[0006] A protection mechanism is arranged on the surface of the current transformer body. The protection mechanism includes a fixed frame, the fixed frame is fixedly connected to the surface of the current transformer body, a fixed rod is fixedly connected to the surface of the fixed frame, a protection frame is arranged on the surface of the fixed frame, a fixed block is fixedly connected to the surface of the protection frame, a first movable rod is movably connected inside the fixed block, a clamping block is fixedly connected to the surface of the first movable rod, a clamping groove is formed on the surface of the fixed rod, and a first spring is fixedly connected to the surface of the clamping block.

[0007] Preferably, the protection mechanism further includes a through groove opened on the inner sides of the fixed frame and the protection frame, and a first rubber pad is fixedly connected to the surface of the through groove.

[0008] Preferably, there are four groups of the fixed rods fixedly connected to the fixed frame, four groups of the fixed blocks fixedly connected to the protection frame, and the clamping block is movably arranged inside the fixed block.

[0009] Preferably, one end of the first spring is fixedly connected to the fixed block, and the other end of the first spring is fixedly connected to the clamping block.

[0010] Preferably, a fixing mechanism is arranged on the surface of the current transformer body. The fixing mechanism includes a connecting block fixedly connected to the surface of the current transformer body. A second movable rod is movably connected inside the connecting block. A clamping plate is fixedly connected to the surface of the second movable rod. A second rubber pad is fixedly connected to the end of the clamping plate away from the second movable rod. A limiting rod is fixedly connected to the surface of the clamping plate. A second spring is fixedly connected to the surface of the second movable rod.

[0011] Preferably, the limiting rod is movably connected to the connecting block. One end of the second spring is fixedly connected to the connecting block, and the other end of the second spring is fixedly connected to the second movable rod.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] Through the settings of the fixed frame and the protection frame, the terminals can be protected, the terminals can be prevented from being exposed outside, thereby reducing the influence of the outside world on the terminals, and further ensuring the use of the terminals and the safety of the current transformer body. Through the engagement and separation of the clamping block and the clamping groove, it is more convenient to fix and remove the protection frame and the fixed frame, which is convenient for connecting the cable and the terminals. At the same time, through the opening of the through groove and the setting of the first rubber pad, after the cable and the terminals are connected, the cable can be clamped inside the through groove and wrapped by the first rubber pad, so that the cable is not easily pulled, the stability of the connection between the cable and the terminals can be ensured, the risk of falling off can be reduced, and it is more convenient to use the current transformer body.

[0014] By allowing the second movable rod to move inside the connecting block, the clamping plate can be driven to move accordingly. Coupled with the elastic property of the second spring, when the cable is passed through the middle of the current transformer body, the clamping plate can clamp the cable, thereby achieving the fixation of the cable and the effect of positioning the cable, making it difficult for the cable to move after entering the current transformer body, which is beneficial to reducing errors and faults. At the same time, the cable surface can be protected through the setting of the second rubber pad, which can prevent the clamping plate from squeezing the cable, reduce the occurrence of indentations on the cable surface, etc., and also make the fixation of the clamping plate on the cable more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view sectional structure schematic diagram of the structure of the present utility model;

[0016] Figure 2 is a top view sectional structure schematic diagram of the fixing frame and the protective frame of the present utility model;

[0017] Figure 3 is a top view sectional structure schematic diagram of the fixing rod and the protective frame of the present utility model;

[0018] Figure 4 is the present utility model Figure 3 the enlarged structure schematic diagram of part A in.

[0019] In the figure: 1, bottom plate; 11, current transformer body; 12, terminal; 2, fixing frame; 21, fixing rod; 22, protective frame; 23, fixing block; 24, first movable rod; 25, clamping block; 26, card slot; 27, first spring; 28, through slot; 29, first rubber pad; 3, connecting block; 31, second movable rod; 32, clamping plate; 33, second rubber pad; 34, limiting rod; 35, second spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-4 , an embodiment provided by the present utility model:

[0022] An external protection type current transformer includes a body, and the body includes a bottom plate 1. The upper surface of the bottom plate 1 is fixedly connected with a current transformer body 11. Terminals 12 are arranged on the surface of the current transformer body 11. The current transformer body 11 is composed of a closed iron core and windings. Its primary winding has very few turns and is strung in the circuit where the current to be measured passes through. Therefore, it often has all the current of the circuit flowing through it. The secondary winding has relatively more turns and is connected in series in the measuring instrument and the protection circuit. When the current transformer body 11 is working, its secondary 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 body 11 is close to a short circuit;

[0023] A protection mechanism is arranged on the surface of the current transformer body 11. The protection mechanism includes a fixing frame 2. The fixing frame 2 is fixedly connected to the surface of the current transformer body 11. Fixing rods 21 are fixedly connected to the surface of the fixing frame 2. A protection frame 22 is arranged on the surface of the fixing frame 2. Fixing blocks 23 are fixedly connected to the surface of the protection frame 22. A first movable rod 24 is movably connected to the inner side of the fixing block 23. A clamping block 25 is fixedly connected to the surface of the first movable rod 24. A clamping groove 26 is formed on the surface of the fixing rod 21. A first spring 27 is fixedly connected to the surface of the clamping block 25. Through the arrangement of the fixing frame 2 and the protection frame 22, the terminals 12 can be prevented from being exposed outside, and thus the terminals 12 can be protected, and the safety of using the current transformer body 11 can be improved.

[0024] Furthermore, the protection mechanism further includes a through groove 28. The through groove 28 is formed on the inner sides of the fixing frame 2 and the protection frame 22. A first rubber pad 29 is fixedly connected to the surface of the through groove 28. Through the formation of the through groove 28 and the cooperation with the arrangement of the first rubber pad 29, after the protection frame 22 is installed on the fixing frame 2, the cable can be clamped by the first rubber pad 29 inside the through groove 28, and thus the cable is not likely to fall off and the connection is more stable.

[0025] Furthermore, four groups of fixing rods 21 are fixedly connected to the fixing frame 2, and four groups of fixing blocks 23 are fixedly connected to the protection frame 22. The clamping blocks 25 are movably arranged inside the fixing blocks 23. By the movement of the clamping blocks 25 inside the fixing blocks 23, the clamping blocks 25 can be engaged with and separated from the clamping grooves 26, and thus it is convenient to fix and remove the protection frame 22 and the fixing frame 2, making the use of the current transformer body 11 more convenient.

[0026] Furthermore, one end of the first spring 27 is fixedly connected to the fixing block 23, and the other end of the first spring 27 is fixedly connected to the clamping block 25. Through the arrangement of the first spring 27, the clamping block 25 can be rebounded and reset. Thus, after the fixing rod 21 enters the inside of the fixing block 23, the clamping block 25 can be automatically engaged with the clamping groove 26, so as to facilitate the fixing of the protection frame 22 and the fixing frame 2 and thus achieve protection.

[0027] Furthermore, a fixing mechanism is provided on the surface of the current transformer body 11. The fixing mechanism includes a connecting block 3 which is fixedly connected to the surface of the current transformer body 11. A second movable rod 31 is movably connected to the inner side of the connecting block 3. A clamping plate 32 is fixedly connected to the surface of the second movable rod 31. A second rubber pad 33 is fixedly connected to the end of the clamping plate 32 away from the second movable rod 31. A limiting rod 34 is fixedly connected to the surface of the clamping plate 32. A second spring 35 is fixedly connected to the surface of the second movable rod 31. Through the arrangement of the limiting rod 34, the movement of the clamping plate 32 can be limited, so that the clamping plate 32 can move stably, thus facilitating the clamping plate 32 to clamp the cable stably.

[0028] Furthermore, the limiting rod 34 is movably connected to the connecting block 3. One end of the second spring 35 is fixedly connected to the connecting block 3, and the other end of the second spring 35 is fixedly connected to the second movable rod 31. Through the arrangement of the second spring 35, the second movable rod 31 can be reset, and then the clamping plate 32 can be reset accordingly and clamp the cable, thus facilitating the positioning of the cable.

[0029] Working principle: During use, connect the cable to the terminal 12, then place the cable inside the through groove 28, and then place the protective frame 22 on the surface of the fixed frame 2, and make the fixing rod 21 enter the inside of the fixed block 23. When the inclined surface of the fixing rod 21 contacts the inclined surface of the clamping block 25, the clamping block 25 will be squeezed, so that the clamping block 25 moves inward into the fixed block 23, and then the first movable rod 24 moves inside the fixed block 23. At this time, the first spring 27 is in a contracted state. When the fixing rod 21 is inserted and the clamping block 25 faces the card slot 26, the clamping block 25 will be reset under the elastic return of the first spring 27 and engage with the card slot 26, thus fixing the protective frame 22 on the fixed frame 2. At this time, the cable is located in the middle of the through groove 28 and is wrapped by the first rubber pad 29, realizing the pressing of the first rubber pad 29 on the cable, so that the cable is not likely to fall off and the terminal 12 can also be prevented from being exposed; when the cable needs to be removed from the terminal 12, by pulling the first movable rod 24, the clamping block 25 is separated from the card slot 26 under the action of the first movable rod 24, so that the limit on the fixing rod 21 can be released, and then the protective frame 22 can be removed from the fixed frame 2;

[0030] By pulling the second movable rod 31, the second movable rod 31 moves inside the connecting block 3. Then, the clamping plate 32 will move accordingly under the action of the second movable rod 31. At this time, the limiting rod 34 moves inside the connecting block 3, and the clamping block 25 is in a stretched state, realizing an increase in the distance between the clamping plates 32. Then, the cable is placed inside the current transformer body 11. By releasing the second movable rod 31, the second movable rod 31 is reset under the rebounding action of the second spring 35, thereby realizing that the clamping plate 32 clamps the cable. At the same time, the second rubber pad 33 contacts the surface of the cable, and the effect of fixing and positioning the cable can be achieved.

[0031] The above is only the preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Any ordinary technician in the industry can smoothly implement the present invention according to the instructions in the attached drawings and the above content. However, any equivalent changes such as slight modifications, refinements, and evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An external protection type current transformer, comprising a body, the body comprising a base plate (1), the upper surface of the base plate (1) being fixedly connected to a current transformer body (11), the surface of the current transformer body (11) being provided with a terminal (12); It is characterized in that A protective mechanism is provided on the surface of the current transformer body (11), the protective mechanism comprising a fixing frame (2), the fixing frame (2) being fixedly connected to the surface of the current transformer body (11), a fixing rod (21) being fixedly connected to the surface of the fixing frame (2), a protective frame (22) being provided on the surface of the fixing frame (2), a fixing block (23) being fixedly connected to the surface of the protective frame (22), a first movable rod (24) being movably connected to the inner side of the fixing block (23), a clamping block (25) being fixedly connected to the surface of the first movable rod (24), a clamping groove (26) being provided on the surface of the fixing rod (21), and a first spring (27) being fixedly connected to the surface of the clamping block (25).

2. The external protection type current transformer according to claim 1, characterized in that: The protection mechanism further comprises a through slot (28), wherein the through slot (28) is provided on the inner sides of the fixing frame (2) and the protection frame (22), and a first rubber pad (29) is fixedly connected to the surface of the through slot (28).

3. The external protection type current transformer according to claim 1, characterized in that: The fixing rods (21) are in four groups and fixedly connected to the fixing frame (2); the fixing blocks (23) are in four groups and fixedly connected to the protection frame (22); and the clamping blocks (25) are movable inside the fixing blocks (23).

4. The external protection type current transformer according to claim 1, characterized in that: One end of the first spring (27) is fixedly connected to the fixing block (23), and the other end of the first spring (27) is fixedly connected to the clamping block (25).

5. The external protection type current transformer according to claim 1, characterized in that: A fixing mechanism is provided on the surface of the current transformer body (11), the fixing mechanism comprising a connecting block (3), the connecting block (3) being fixedly connected to the surface of the current transformer body (11), a second movable rod (31) being movably connected to the inner side of the connecting block (3), a clamping plate (32) being fixedly connected to the surface of the second movable rod (31), a second rubber pad (33) being fixedly connected to one end of the clamping plate (32) away from the second movable rod (31), a limiting rod (34) being fixedly connected to the surface of the clamping plate (32), and a second spring (35) being fixedly connected to the surface of the second movable rod (31).

6. The external protection type current transformer according to claim 5, characterized in that: The limiting rod (34) is movably connected to the connecting block (3), one end of the second spring (35) is fixedly connected to the connecting block (3), and the other end of the second spring (35) is fixedly connected to the second movable rod (31).

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