Zero sequence current transformer

Abstract

The utility model discloses a zero sequence current transformer, and relates to the technical field of transformers. The transformer comprises a transformer body, connecting covers are symmetrically and fixedly connected to the top and the bottom of the transformer body in a sleeved mode, fixing frames are fixedly connected to the outer walls of the connecting covers, movable frames are movably arranged in the fixing frames in a penetrating mode, screw rods are rotationally connected to the interiors of the fixing frames through bearings, and the lower ends of the screw rods penetrate through the middles of the movable frames in a threaded mode; the upper end of the screw extends to the outside of the fixing frame and is fixedly provided with an adjusting handle, the two ends of the movable frame are bent towards the side wall of the connecting cover and are fixedly connected with arc-shaped fixing bases, and anti-skid teeth are arranged on the inner side walls of the arc-shaped fixing bases. According to the utility model, the screw rod is rotated to drive the movable frame and the arc-shaped fixed seat to move towards the cable together, and the anti-skid teeth on the inner side wall of the arc-shaped fixed seat are propped against the surface of the cable, so that the position of the mutual inductor body can be locked through the connecting cover, and the mutual inductor body is prevented from moving along the cable.

Description

Technical Field

[0001] The utility model belongs to the technical field of current transformers, and particularly relates to a zero-sequence current transformer. Background Technique

[0002] The zero-sequence current transformer is a monitoring device used to measure cable line faults. In the case of cable leakage and unstable voltage, etc., the zero-sequence current transformer sends a signal to the control device to cut off the power, so as to monitor and protect the cable in real time. After retrieval, the patent with the application number 202320587551.7 discloses a zero-sequence current transformer. A circular fastener is arranged on the outer surface of the transformer. The circular fastener includes two strip-shaped parts. The two strip-shaped parts of the circular fastener are movably connected by bolts. Three positioning blocks are equidistantly arranged on the circular fastener. A threaded rod is rotatably connected to the positioning block. One end of the threaded rod is rotatably connected to an arc-shaped pressing block, and a rubber pad is arranged on the arc-shaped pressing block.

[0003] However, during the actual use process, the applicant found that after sleeving the circular fastener on the outside of the transformer to fix the transformer, due to the lack of a limiting connection structure between the transformer and the circular fastener, the transformer is very easy to slide out from the inside of the circular fastener, and then the transformer will move randomly along the cable. In view of this, we propose a zero-sequence current transformer. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0005] The utility model provides a zero-sequence current transformer, which includes a transformer body. Connecting covers are symmetrically sleeved and fixed at the top and bottom of the transformer body. A fixed frame is fixedly connected to the outer wall of the connecting cover. An activity frame is movably penetrated through the fixed frame. A screw rod is rotatably connected to the inside of the fixed frame through a bearing. The lower end of the screw rod threadedly penetrates through the middle of the activity frame. The upper end of the screw rod extends to the outside of the fixed frame and is fixed with an adjusting handle. The two ends of the activity frame are bent towards the side wall of the connecting cover and fixedly connected with arc-shaped fixing seats. Anti-slip teeth are arranged on the inner side wall of the arc-shaped fixing seat.

[0006] Preferably, the arc-shaped fixing seat is fixedly connected to the activity frame through a locking screw.

[0007] Preferably, installation grooves are formed at both ends of the activity frame, and an installation seat is arranged in the middle of the outer side of the arc-shaped fixing seat.

[0008] Preferably, the installation seat is installed in the installation groove, and one end of the locking screw penetrates through a stepped hole formed in the middle of the inner side of the arc-shaped fixing seat and is threadedly screwed into a threaded hole formed at both ends of the activity frame.

[0009] Preferably, guiding sliding grooves are symmetrically formed on both sides of the connecting cover, and two ends of the movable frame slide along the guiding sliding grooves.

[0010] Preferably, a plurality of anti-slip teeth on the inner side wall of the arc-shaped fixing seat are arranged side by side at equal intervals.

[0011] The utility model has the following beneficial effects:

[0012] For a zero-sequence current transformer of the utility model, by rotating the screw rod, the movable frame together with the arc-shaped fixing seat moves towards the cable, and the anti-slip teeth on the inner side wall of the arc-shaped fixing seat abut against the surface of the cable, so that the position of the transformer body can be locked through the connecting cover, preventing the transformer body from moving along the cable. By screwing out the locking screw from the connecting cover, the arc-shaped fixing seat can be detached from the end of the movable frame for replacement, so that an arc-shaped fixing seat adapted to the cable can be selected according to the cable diameter, enabling the anti-slip teeth to better contact the surface of the cable, thus better adapting to cables with different diameters and having stronger practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of a zero-sequence current transformer of the utility model;

[0015] Figure 2 It is a schematic diagram of the top view connection structure of the connecting cover, movable frame and arc-shaped fixing seat in a zero-sequence current transformer of the utility model;

[0016] Figure 3 It is a schematic diagram of the bottom view connection structure of the connecting cover, movable frame and arc-shaped fixing seat in a zero-sequence current transformer of the utility model;

[0017] Figure 4 It is an exploded view of the movable frame and the arc-shaped fixing seat in a zero-sequence current transformer of the utility model.

[0018] In the drawings, the list of components represented by each reference numeral is as follows:

[0019] 1, transformer body; 2, connecting cover; 21, guiding sliding groove; 3, fixing frame; 4, movable frame; 41, installation groove; 5, arc-shaped fixing seat; 51, anti-slip tooth; 52, mounting seat; 6, screw rod; 61, adjusting handle; 7, locking screw. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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 as shown, the present utility model provides a technical solution:

[0022] A zero-sequence current transformer includes a transformer body 1. Connecting covers 2 are symmetrically sleeved and fixed on the top and bottom of the transformer body 1. A fixed frame 3 is fixedly connected to the outer wall of the connecting cover 2. A movable frame 4 movably penetrates through the fixed frame 3. A screw rod 6 is rotatably connected to the inside of the fixed frame 3 through a bearing. The lower end of the screw rod 6 threadedly penetrates through the middle of the movable frame 4. The upper end of the screw rod 6 extends to the outside of the fixed frame 3 and is fixed with an adjusting handle 61. The two ends of the movable frame 4 are bent towards the side wall of the connecting cover 2 and fixedly connected with arc-shaped fixing seats 5. Guide chutes 21 are symmetrically opened on both sides of the connecting cover 2. The two ends of the movable frame 4 slide along the guide chutes 21. Anti-slip teeth 51 are arranged on the inner side wall of the arc-shaped fixing seat 5. By rotating the screw rod 6, the movable frame 4 together with the arc-shaped fixing seat 5 moves towards the cable, and the anti-slip teeth 51 on the inner side wall of the arc-shaped fixing seat 5 abut against the surface of the cable, so that the position of the transformer body 1 can be locked through the connecting cover 2, preventing the transformer body 1 from moving along the cable. A number of anti-slip teeth 51 on the inner side wall of the arc-shaped fixing seat 5 are arranged side by side at equal intervals. During use, the transformer body 1 together with the connecting cover 2 is sleeved on the cable, and the upper and lower adjusting handles 61 are manually rotated clockwise to drive the screw rod 6 to rotate. The rotation of the screw rod 6 can drive the movable frame 4 together with the arc-shaped fixing seat 5 to move towards the cable, and the anti-slip teeth 51 abut against the surface of the cable. Through the effective contact between the anti-slip teeth 51 and the surface of the cable, relative movement between the arc-shaped fixing seat 5 and the cable can be prevented, so that the position of the connecting cover 2 and the transformer body 1 connected to the connecting cover 2 can be locked, preventing the transformer body 1 from sliding easily along the cable.

[0023] The arc-shaped fixing seat 5 is fixedly connected to the movable frame 4 through a locking screw 7. Installation grooves 41 are provided at both ends of the movable frame 4. A mounting seat 52 is arranged in the middle on the outer side of the arc-shaped fixing seat 5. The mounting seat 52 is installed in the installation groove 41. One end of the locking screw 7 passes through a stepped hole provided in the middle of the inner side of the arc-shaped fixing seat 5 and is screwed into a threaded hole provided at both ends of the movable frame 4. By unscrewing the locking screw 7 from the connection cover 2, the arc-shaped fixing seat 5 can be detached from the end of the movable frame 4 for replacement. Thus, an arc-shaped fixing seat 5 adapted to the cable can be selected according to the cable diameter, enabling the anti-slip teeth 51 to better contact the surface of the cable, better adapting to cables of different diameters, and having stronger practicability. Before sleeving the transformer body 1 on the cable, an arc-shaped fixing seat 5 adapted to the cable can be selected according to the cable diameter, and the mounting seat 52 on the arc-shaped fixing seat 5 is installed in the installation groove 41. Then, the locking screw 7 is passed through the stepped hole on the arc-shaped fixing seat 5 and screwed into the movable frame 4, and the arc-shaped fixing seat 5 adapted to the cable diameter can be fixedly installed on the end of the movable frame 4.

[0024] Working principle: During use, before sleeving the transformer body 1 on the cable, an arc-shaped fixing seat 5 adapted to the cable can be selected according to the cable diameter, and the mounting seat 52 on the arc-shaped fixing seat 5 is installed in the installation groove 41. Then, the locking screw 7 is passed through the stepped hole on the arc-shaped fixing seat 5 and screwed into the movable frame 4, and the arc-shaped fixing seat 5 adapted to the cable diameter can be fixedly installed on the end of the movable frame 4. Then, the transformer body 1 together with the connection cover 2 is sleeved on the cable, and by manually rotating the upper and lower adjusting handles 61 clockwise to drive the screw rod 6 to rotate, the rotation of the screw rod 6 can drive the movable frame 4 together with the arc-shaped fixing seat 5 to move towards the cable, and the anti-slip teeth 51 are abutted against the surface of the cable. Through the effective contact between the anti-slip teeth 51 and the cable surface, relative movement between the arc-shaped fixing seat 5 and the cable can be prevented, thereby locking the position of the connection cover 2 and the transformer body 1 connected to the connection cover 2 and preventing the transformer body 1 from easily sliding along the cable.

[0025] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0026] The above are only the preferred embodiments of the present utility model and do not limit the present utility model. Any modification to the technical solutions recorded in the foregoing embodiments and any equivalent replacement of some technical features thereof shall fall within the protection scope of the present utility model.

Claims

1. A zero-sequence current transformer, comprising a transformer body (1), characterized in that: The top and bottom of the transformer body (1) are symmetrically sleeved and fixed with a connection cover (2); a fixed frame (3) is fixedly connected to the outer wall of the connection cover (2); a movable frame (4) is movably provided in the fixed frame (3); a screw rod (6) is rotatably connected to the interior of the fixed frame (3) via a bearing; the lower end of the screw rod (6) is threadedly passed through the middle of the movable frame (4); the upper end of the screw rod (6) extends to the outside of the fixed frame (3) and is fixed with an adjustment handle (61); the two ends of the movable frame (4) are bent toward the side wall of the connection cover (2) and are fixedly connected to an arc-shaped fixed seat (5); and anti-slip teeth (51) are provided on the inner side wall of the arc-shaped fixed seat (5).

2. A zero-sequence current transformer according to claim 1, characterized in that: The arc-shaped fixing seat (5) is fixedly connected to the movable frame (4) via a locking screw (7).

3. A zero-sequence current transformer according to claim 2, characterized in that: Both ends of the movable frame (4) are provided with mounting grooves (41), and a mounting seat (52) is provided in the middle of the outer side of the arc-shaped fixing seat (5).

4. A zero-sequence current transformer according to claim 3, characterized in that: The mounting seat (52) is installed in the mounting groove (41), and one end of the locking screw (7) passes through the stepped hole opened in the middle of the inner side of the arc-shaped fixing seat (5) and is screwed into the threaded holes opened at both ends of the movable frame (4).

5. A zero-sequence current transformer according to claim 1, characterized in that: The connecting cover (2) is symmetrically provided with guide slots (21) on both sides, and the two ends of the movable frame (4) slide along the guide slots (21).

6. A zero-sequence current transformer according to claim 1, characterized in that: A plurality of anti-slip teeth (51) are arranged side by side and at equal intervals on the inner side wall of the arc-shaped fixing seat (5).

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