Electricity larceny prevention mutual inductor

Abstract

The utility model relates to an electricity larceny prevention mutual inductor which comprises a base, a secondary junction box and a mutual inductor set, the mutual inductor set comprises two single-phase current mutual inductors and two single-phase voltage mutual inductors, and the mutual inductors are sequentially connected through connecting copper bars or wires; a terminal strip and a secondary binding post are arranged in the secondary junction box, lugs are arranged on the two sides in the secondary junction box, and internal threaded holes and internal threading holes are formed in the lugs; a concave lug is arranged on the inner side of a box cover of the secondary junction box, an outer threaded hole and an outer threading hole are arranged on the concave lug, the box cover is detachably fixed on the secondary junction box in the mode that the inner threaded hole and the outer threaded hole are fixed through screws, and a lead sealing anti-theft rope is arranged between the inner threading hole and the outer threading hole in a penetrating mode. According to the mutual inductor capable of preventing electricity larceny, the secondary junction box end is structurally optimized, private connection and electricity larceny can be effectively prevented in the mode that lead sealing is conducted firstly and then cover closing and fixing are conducted, meanwhile, the modular combination mode is adopted, a certain single-phase mutual inductor is convenient to disassemble, assemble, maintain and replace, and the use and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology and equipment, specifically to an anti-theft current transformer. Background Technology

[0002] A combined instrument transformer is a multi-functional instrument transformer that integrates a current transformer and a voltage transformer into one unit. Existing combined instrument transformers often have exposed secondary terminals or only superficial protection, posing a risk of electricity theft due to unauthorized wiring connections. Furthermore, combined instrument transformers generally employ a single, molded structure, making inspection and repair difficult when a single transformer fails, and individual replacement is not possible, resulting in high operating costs. Utility Model Content

[0003] The technical problem this utility model aims to solve is to overcome the potential for electricity theft due to unauthorized connections to loads on the secondary side of existing combined current transformers, as well as the high cost of use and inconvenience of maintenance and repair caused by the integrated structure. It provides a current transformer designed to prevent electricity theft by optimizing the structure of the secondary junction box. This can be achieved by sealing the box with lead before closing the cover, effectively preventing unauthorized connections. Furthermore, by adopting a modular design, each individual current transformer is fixed to the base using a plug-in assembly method, facilitating the disassembly, repair, and replacement of individual current transformers and reducing usage and maintenance costs.

[0004] This anti-theft transformer includes a base, a secondary junction box mounted on the base, and a transformer assembly inserted into the base. The transformer assembly includes two single-phase current transformers and two single-phase voltage transformers. The primary terminals of one side of the single-phase current transformer are connected sequentially to the primary terminals of the two single-phase voltage transformers and the primary terminals of the other side of the single-phase current transformer via connecting copper busbars or wires. The secondary junction box contains terminal blocks with secondary terminals. A pair of lugs are located on both sides of the interior of the secondary junction box, with internal threaded holes and internal wire-passing holes on the lugs. A cover is located on the outside of the secondary junction box to cover the terminal blocks. A pair of recessed lugs are located on the inside of the cover, with external threaded holes and external wire-passing holes matching the internal threaded holes and internal wire-passing holes on the recessed lugs. The cover is detachably fixed to the secondary junction box by screws to secure the internal and external threaded holes, and a lead-sealed anti-theft rope is threaded between the internal and external wire-passing holes.

[0005] Furthermore, the base is a fully enclosed hollow structure, and the upper surface of the base is provided with positioning sleeve holes for inserting each current transformer and terminal slots for accommodating the secondary wiring terminals of each current transformer; the secondary wiring terminals and the corresponding secondary terminals on the terminal blocks are connected by wires housed in the base.

[0006] Furthermore, the inner side of the single-phase current transformer and the two sides of the single-phase voltage transformer are provided with L-shaped splicing edges, and the L-shaped splicing edges on adjacent transformers match; the bottom of the single-phase current transformer and the single-phase voltage transformer are provided with positioning posts that match the positioning sleeve holes.

[0007] Furthermore, the positioning post has a threaded portion and a fastening nut is threaded into the base.

[0008] Furthermore, the base has fixing ears on both sides and fixing slots on the fixing ears; the bottom surface of the base is detachably fitted with a bottom shell.

[0009] This utility model discloses an anti-theft current transformer, which overcomes the potential for electricity theft due to unauthorized connections to loads on the secondary side of existing combined current transformers, as well as the high operating costs and inconvenient maintenance and repair of single-phase structures caused by the integrated structure. By optimizing the structure of the secondary junction box, it can effectively prevent unauthorized connections and electricity theft by sealing it with lead and then closing the cover. At the same time, it adopts a modular combination form, with each single current transformer fixed on the base by splicing and other methods, which facilitates the disassembly, repair and replacement of individual current transformers, reducing the cost of use and maintenance. Attached Figure Description

[0010] The following description, in conjunction with the accompanying drawings, further illustrates an anti-theft current transformer according to this utility model:

[0011] Figure 1 This is a front-view three-dimensional structural diagram of the current transformer used to prevent electricity theft;

[0012] Figure 2 yes Figure 1 A schematic diagram of the exploded structure;

[0013] Figure 3 yes Figure 2 Enlarged view of the local structure of part A in the middle;

[0014] Figure 4 yes Figure 2 A schematic diagram of the structure viewed from below;

[0015] Figure 5 yes Figure 4 Enlarged view of the local structure of part B in the middle section.

[0016] In the picture:

[0017] 1-Base; 11-Positioning sleeve hole; 12-Terminal slot; 13-Fixing ear; 14-Fixing slot; 15-Bottom shell;

[0018] 2-Secondary junction box; 21-Terminal block; 22-Secondary terminal block; 23-Protruding lug; 24-Box cover; 25-Concave lug; 26-Lead seal anti-theft rope; 231-Internal threaded hole; 232-Internal wire hole; 251-External threaded hole; 252-External wire hole;

[0019] 3-Inductor group; 31-Single-phase current transformer, 32-Single-phase voltage transformer, 33-Primary terminal block, 34-Secondary terminal block, 35-L-type interlocking rib, 36-Positioning post, 37-Fastening nut;

[0020] 4- Connect the copper busbar or wire. Detailed Implementation

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] The present invention will be further described below with specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0024] Implementation method 1: such as Figures 1 to 5As shown, this anti-theft transformer includes a base 1, a secondary junction box 2 mounted on the base 1, and a transformer assembly 3 inserted into the base 1. The transformer assembly 3 includes two single-phase current transformers 31 and two single-phase voltage transformers 32. The primary terminal 33 of one side of the single-phase current transformer 31 is connected sequentially to the primary terminal 33 of the two single-phase voltage transformers 32 and the primary terminal 33 of the other side of the single-phase current transformer 31 via connecting copper busbars or wires 4. The secondary junction box 2 contains a terminal block 21 with secondary terminals on it. 22. The secondary junction box 2 has a pair of lugs 23 on both sides inside, and internal threaded holes 231 and internal wire-passing holes 232 are opened on the lugs 23. The secondary junction box 2 has a cover 24 for covering the terminal block 21 on the outside. The cover 24 has a pair of recessed lugs 25 on the inside, and external threaded holes 251 and external wire-passing holes 252 that match the internal threaded holes 231 and internal wire-passing holes 232 are opened on the recessed lugs 25. The cover 23 is detachably fixed to the secondary junction box 2 by fixing the internal and external threaded holes with screws, and a lead-sealed anti-theft rope 26 is inserted between the internal and external wire-passing holes.

[0025] Implementation Method 2: The base 1 of this anti-theft transformer is a fully enclosed hollow structure. The upper surface of the base 1 is provided with positioning sleeve holes 11 for inserting each transformer and terminal slots 12 for accommodating the secondary wiring terminals 34 of each transformer. The secondary wiring terminals 34 and the corresponding secondary terminals 22 on the terminal block 21 are connected by wires housed within the base 1. The secondary terminals of each transformer are connected to the terminal block by concealed wires, resulting in a neat and clear terminal layout that facilitates instrument wiring operations and subsequent inspection and maintenance. The terminal block is protected by a closed enclosure, ensuring safety and aesthetics. The remaining structures and components are as described in Implementation Method 1 and will not be repeated.

[0026] Implementation Method 3: The single-phase current transformer 31 and the single-phase voltage transformer 32 of this anti-theft transformer have L-shaped interlocking ribs 35 on their inner sides and on both sides, respectively. The L-shaped interlocking ribs 35 on adjacent transformers match. The bottom of the single-phase current transformer 31 and the single-phase voltage transformer 32 have positioning posts 36 that match the positioning sleeve holes 11. Each single-phase transformer is interlocked and fixed to the base, facilitating the disassembly, repair, and replacement of any single-phase transformer. The remaining structures and components are as described in Implementation Method 1 and will not be repeated.

[0027] Implementation Method 4: The positioning post 36 of this anti-theft transformer has a threaded portion, and a fastening nut 37 is threaded into the base 1. After inserting the positioning post into the positioning sleeve hole, it is fixed in the base cavity by the fastening nut, thereby completing the installation of the transformer, making the installation, disassembly, and replacement of each individual transformer more convenient. The remaining structures and components are as described in Implementation Method 1, and will not be described again.

[0028] Implementation Method 5: The base 1 of this anti-theft transformer has fixing ears 13 on both sides, and fixing slots 14 are formed on the fixing ears 13; a bottom shell 15 is detachably fastened to the bottom surface of the base 1. The fixing ears are used to install the transformer as a whole on the support of the distribution cabinet or tower. The fixing slots on the fixing ears are used for bolt insertion. The detachable bottom shell is covered and fixed by the support after the whole installation. When replacing a single transformer, the bottom shell can be removed and the transformer can be removed by loosening the fastening nut, which is convenient. The remaining structures and components are as described in Implementation Method 1 and will not be described again.

[0029] In use: After the busbar is disconnected, connect one end to the primary terminal input terminal of one side of the single-phase current transformer. The primary terminal output terminal is connected to the primary terminals of two single-phase voltage transformers and the primary terminal input terminal of the other side of the single-phase current transformer in sequence through connecting copper busbars or wires. The primary terminal output terminal of the other side of the single-phase current transformer is connected to the other end of the disconnected busbar. After the instrument is wired in the junction box, the anti-theft cord and the wire hole are used to lock the box against electricity theft. Specifically, the anti-theft cord consists of a cotton rope and a lead seal block. The cotton rope is inserted into the inner wire hole on the two lugs of the secondary junction box, and the other end of the cotton rope is inserted into the inner wire hole of the box cover. The two ends of the rope are tied together with the lead seal block and then pressed with lead seal pliers. Then the cover is closed to store the anti-theft cord in the secondary junction box. The internal and external threaded holes on the lugs are fixed with screws to complete the anti-theft sealing of the terminal.

[0030] This utility model discloses an anti-theft current transformer, which overcomes the potential for electricity theft due to unauthorized connections to loads on the secondary side of existing combined current transformers, as well as the high operating costs and inconvenient maintenance and repair of single-phase structures caused by the integrated structure. By optimizing the structure of the secondary junction box, it can effectively prevent unauthorized connections and electricity theft by sealing it with lead and then closing the cover. At the same time, it adopts a modular combination form, with each single current transformer fixed on the base by splicing and other methods, which facilitates the disassembly, repair and replacement of individual current transformers, reducing the cost of use and maintenance.

[0031] The above description illustrates the main features, basic principles, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments or examples described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments or examples should be considered exemplary and not restrictive. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An anti-theft current transformer, characterized in that: Includes a base (1), a secondary junction box (2) set on the base (1), and a transformer group (3) inserted on the base (1). The transformer group (3) includes two single-phase current transformers (31) and two single-phase voltage transformers (32). The primary terminal (33) of one side of the single-phase current transformer (31) is connected to the primary terminal (33) of the two single-phase voltage transformers (32) and the primary terminal (33) of the other side of the single-phase current transformer (31) in sequence through connecting copper busbars or wires (4). The secondary junction box (2) is provided with a terminal block (21) and a secondary terminal block (22) on the terminal block (21). The secondary junction box (2) has a pair of lugs (23) on both sides inside, and an internal threaded hole (231) and an internal wire hole (232) are opened on the lugs (23). The secondary junction box (2) is provided with a cover (24) for covering the terminal block (21) on the outside. The cover (24) has a pair of recessed lugs (25) on the inside, and an external threaded hole (251) and an external wire hole (252) that match the internal threaded hole (231) and the internal wire hole (232) are opened on the recessed lugs (25). The cover (24) is detachably fixed to the secondary junction box (2) by fixing the internal and external threaded holes with screws, and a lead-sealed anti-theft rope (26) is inserted between the internal and external wire holes.

2. The current transformer for preventing electricity theft according to claim 1, characterized in that: The base (1) is a fully enclosed hollow structure. The upper surface of the base (1) is provided with positioning sleeve holes (11) for inserting each current transformer and terminal slots (12) for accommodating the secondary wiring terminals (34) of each current transformer. The secondary wiring terminals (34) and the corresponding secondary wiring posts (22) on the terminal block (21) are connected by wires stored in the base (1).

3. The current transformer for preventing electricity theft according to claim 2, characterized in that: The inner side of the single-phase current transformer (31) and the two sides of the single-phase voltage transformer (32) are provided with L-shaped splicing ribs (35), and the L-shaped splicing ribs (35) on the adjacent transformers are matched; the bottom of the single-phase current transformer (31) and the single-phase voltage transformer (32) are provided with positioning posts (36) that match the positioning sleeve hole (11).

4. The current transformer for preventing electricity theft according to claim 3, characterized in that: The positioning post (36) has a threaded part and a fastening nut (37) is threaded into the base (1).

5. The current transformer for preventing electricity theft according to claim 3, characterized in that: The base (1) has fixing ears (13) on both sides and fixing slots (14) on the fixing ears (13); the bottom surface of the base (1) is detachably fitted with a bottom shell (15).

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