Combined mutual inductor

Abstract

The utility model relates to a combined mutual inductor, which comprises a base, a secondary junction box and a mutual inductor group, the mutual inductor group 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 leads; the upper surface of the base is provided with a positioning sleeve hole and a terminal long groove. L-shaped splicing edges are arranged on the inner side of the single-phase current transformer and the two sides of the single-phase voltage transformer; and positioning columns matched with the positioning sleeve holes are arranged at the bottoms of the single-phase current transformer and the single-phase voltage transformer. According to the combined type mutual inductor structure, a modular combination form is adopted, the single-phase mutual inductors are spliced, inserted, combined and fixed on the base, the disassembly, assembly, maintenance and replacement of a certain single-phase mutual inductor are facilitated, the use and maintenance cost is reduced, the secondary ends of the mutual inductors are connected and concentrated on the terminal strip through hidden wires and are shielded, the combined type mutual inductor structure is safe and attractive, and meanwhile, the combined type mutual inductor structure is convenient to assemble and disassemble. The terminal layout is regular and clear, and instrument wiring operation and later mutual inductor replacement, inspection and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology and equipment, and particularly relates to a combined mutual inductor. Background Art

[0002] A combined mutual inductor is a multifunctional mutual inductor that combines a current mutual inductor and a voltage mutual inductor into one. Existing combined mutual inductors generally adopt an integrally molded structure, which has the following deficiencies:

[0003] (1) When a single-phase mutual inductor in the overall structure fails, it is difficult to inspect and repair, and it cannot be replaced separately, resulting in high usage costs.

[0004] (2) The secondary wiring terminals are exposed or only formally protected, posing safety hazards such as unauthorized wiring modification and unauthorized connection of loads. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the defects of high usage costs and inconvenient maintenance and repair of the single-phase structure caused by the integrally molded structure of the existing combined mutual inductor, and to provide a combined mutual inductor. Its structure adopts a modular combination form, and each single-phase mutual inductor is inserted, combined and fixed on the base, which is convenient for the disassembly, repair and replacement of a single-phase mutual inductor, reduces the usage and maintenance costs. The secondary ends of each mutual inductor are connected by hidden wires and concentrated on the terminal block and protected, which is safe and beautiful, and at the same time makes the terminal layout regular and clear, facilitating the instrument wiring operation and the later disassembly, inspection and maintenance of the mutual inductor.

[0006] This combined mutual inductor includes a base, a secondary wiring box arranged on the base, and a mutual inductor group inserted on the base. Among them, the mutual inductor group includes two single-phase current mutual inductors and two single-phase voltage mutual inductors. The primary terminal posts of one side single-phase current mutual inductor are sequentially connected to the primary terminal posts of the two single-phase voltage mutual inductors and the primary terminal posts of the other side single-phase current mutual inductor through connecting copper bars or wires; the base is a fully enclosed hollow structure, and the upper surface of the base is provided with positioning sleeve holes for inserting each mutual inductor and terminal long grooves for accommodating the secondary wiring terminals of each mutual inductor; L-shaped insertion edges are provided on the inner side of the single-phase current mutual inductor and on both sides of the single-phase voltage mutual inductor, and the L-shaped insertion edges on adjacent mutual inductors are matched; positioning posts matching the positioning sleeve holes are provided at the bottoms of the single-phase current mutual inductor and the single-phase voltage mutual inductor.

[0007] Further, a terminal block is arranged in the secondary wiring box, and secondary wiring posts are arranged on the terminal block. The secondary wiring terminals and the corresponding secondary wiring posts on the terminal block are connected by wires received in the base.

[0008] Further, threads are provided on the positioning posts, and fastening nuts are screwed in the base.

[0009] Further, a box cover for covering the terminal row is provided on the secondary junction box, and the box cover is detachably fixed to the secondary junction box by screws.

[0010] Further, fixing ears are provided on both sides of the base, and fixing long slots are formed in the fixing ears; a bottom case is detachably buckled on the bottom surface of the base.

[0011] A combined transformer of the present utility model overcomes the defects of high use cost and inconvenient maintenance and repair of the single-phase structure caused by the integrated structure of the existing combined transformer. Its structure adopts a modular combination form, and each single-phase transformer is inserted, combined and fixed on the base, which is convenient for the disassembly, repair and replacement of a single-phase transformer, reduces the use and maintenance costs. The secondary ends of each transformer are connected by hidden wires and concentrated on the terminal row and shielded. While being safe and beautiful, the terminal layout is regular and clear, which is convenient for the wiring operation of the instrument and the later disassembly, replacement, inspection and maintenance of the transformer. Description of the Drawings

[0012] The following further describes a combined transformer of the present utility model with reference to the drawings:

[0013] Figure 1 is the front three-dimensional structural schematic diagram of the combined transformer;

[0014] Figure 2 is Figure 1 the exploded structural schematic diagram of

[0015] Figure 3 is Figure 2 the upward-looking structural schematic diagram of

[0016] In the figure:

[0017] 1 - base; 11 - positioning sleeve hole, 12 - terminal long slot, 13 - fixing ear, 14 - fixing long slot, 15 - bottom case;

[0018] 2 - secondary junction box; 21 - terminal row, 22 - secondary wiring post, 23 - box cover;

[0019] 3 - transformer bank; 31 - single-phase current transformer, 32 - single-phase voltage transformer, 33 - primary terminal post, 34 - secondary wiring terminal, 35 - L-shaped insertion edge, 36 - positioning post, 37 - fastening nut;

[0020] 4 - connecting copper bar or wire. Detailed Embodiments

[0021] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] The following uses specific embodiments to further describe the technical solution of the present utility model, but the protection scope of the present utility model is not limited to the following embodiments.

[0024] Embodiment 1: As Figures 1 to 3 shown, this combined mutual inductor includes a base 1, a secondary wiring box 2 provided on the base 1, and a mutual inductor group 3 inserted on the base 1. Among them, the mutual inductor group 3 includes two single-phase current transformers 31 and two single-phase voltage transformers 32. The primary terminal posts 33 of one side single-phase current transformer 31 are sequentially connected to the primary terminal posts 33 of the two single-phase voltage transformers 32 and the primary terminal posts 33 of the other side single-phase current transformer 31 through a connecting copper bar or wire 4; the base 1 is a fully enclosed hollow structure, and the upper surface of the base 1 is provided with positioning sleeve holes 11 for inserting each mutual inductor and terminal long grooves 12 for accommodating the secondary wiring terminals 34 of each mutual inductor; L-shaped inserting edges 35 are provided on the inner side of the single-phase current transformer 31 and on both sides of the single-phase voltage transformer 32, and the L-shaped inserting edges 35 on adjacent mutual inductors are matched; positioning posts 36 matching the positioning sleeve holes 11 are provided at the bottoms of the single-phase current transformer 31 and the single-phase voltage transformer 32.

[0025] Embodiment 2: In the secondary wiring box 2 of this combined mutual inductor, a terminal row 21 is provided, and secondary wiring posts 22 are provided on the terminal row 21. The secondary wiring terminals 34 and the corresponding secondary wiring posts 22 on the terminal row 21 are connected through wires accommodated in the base 1. By concentrating the secondary ends of each mutual inductor on one terminal row, when the instrument is connected, it can be directly connected to the secondary wiring posts on the terminal row through the wire groove opened on the wiring box, making the instrument wiring operation simple and the later inspection and maintenance convenient. The remaining structures and components are as described in Embodiment 1 and will not be repeated here.

[0026] Embodiment 3: The positioning post 36 of the combined current transformer is threaded, and a fastening nut 37 is threadedly connected inside the base 1. After inserting the positioning post into the positioning sleeve hole, it is fixed in the base cavity with the fastening nut, thus completing the installation of the current transformer, making the installation, disassembly and replacement of each single-phase current transformer more convenient. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0027] Embodiment 4: The secondary junction box 2 of the combined current transformer is provided with a box cover 23 for covering the terminal block 21, and the box cover 23 is detachably fixed on the secondary junction box 2 by screws. The box cover is used to cover and protect the terminal block, which is safe, beautiful and can prevent unauthorized wiring modification. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0028] Embodiment 5: Fixed ears 13 are provided on both sides of the base 1 of the combined current transformer, and fixing long slots 14 are opened on the fixed ears 13; a bottom case 15 is detachably buckled on the bottom surface of the base 1. The fixed ears are used for the overall installation of this current transformer on the bracket of the power distribution cabinet or the tower pole. The fixing long slots on the fixed ears are used for bolt insertion. The detachable bottom case is fixed by being blocked by the bracket after the overall installation. When replacing a single-phase current transformer, the bottom case can be removed, and the fastening nut can be loosened to remove the current transformer, which is convenient to operate. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0029] During use: After the busbar is disconnected, one end is connected to the input end of the primary terminal post of one side single-phase current transformer, and the output end of the primary terminal post is connected to the primary terminal posts of two single-phase voltage transformers and the input end of the primary terminal post of the other side single-phase current transformer in sequence through a connecting copper bar or wire; the output end of the primary terminal post of the other side single-phase current transformer is connected to the other end of the disconnected busbar. Each single-phase current transformer is spliced, combined and fixed on the base, which is convenient for the disassembly, maintenance and replacement of a certain single-phase current transformer. The secondary ends of each current transformer are connected to the terminal block through hidden wires and concentrated on the terminal block. The terminal layout is regular and clear, which is convenient for instrument wiring operation and later inspection and maintenance. The terminal block is protected by a closed box body, which is safe, beautiful and can prevent unauthorized wiring modification.

[0030] This combined current transformer overcomes the defects of the existing combined current transformer with an integrated structure, which leads to high use cost and inconvenient maintenance and repair of the single-phase structure. Its structure adopts a modular combination form. Each single-phase current transformer is spliced, combined and fixed on the base, which is convenient for the disassembly, maintenance and replacement of a certain single-phase current transformer, reducing the use and maintenance costs. The secondary ends of each current transformer are connected to the terminal block through hidden wires and concentrated on the terminal block and are protected. While being safe and beautiful, the terminal layout is regular and clear, which is convenient for instrument wiring operation and later disassembly, replacement, inspection and maintenance of the current transformer.

[0031] The above description shows the main features, basic principles, and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments or examples, and without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. Therefore, the above-described embodiments or examples should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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. A combined mutual inductor, characterized in that: It includes a base (1), a secondary junction box (2) arranged on the base (1), and an instrument transformer group (3) inserted on the base (1). Among them, the instrument transformer group (3) includes two single-phase current transformers (31) and two single-phase voltage transformers (32). The primary terminal posts (33) of one side single-phase current transformer (31) are sequentially connected to the primary terminal posts (33) of the two single-phase voltage transformers (32) and the primary terminal posts (33) of the other side single-phase current transformer (31) through connecting copper bars or wires (4). 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 instrument transformer and terminal long grooves (12) for accommodating the secondary terminal posts (34) of each instrument transformer. L-shaped insertion edges (35) are provided on the inner side of the single-phase current transformer (31) and on both sides of the single-phase voltage transformer (32), and the L-shaped insertion edges (35) on adjacent instrument transformers are matched; positioning posts (36) matching the positioning sleeve holes (11) are provided at the bottoms of the single-phase current transformer (31) and the single-phase voltage transformer (32).

2. The combined mutual inductor according to claim 1, characterized in that: A terminal block (21) is provided in the secondary junction box (2), and secondary terminal posts (22) are provided on the terminal block (21). The secondary terminal posts (34) and the corresponding secondary terminal posts (22) on the terminal block (21) are connected by wires accommodated in the base (1).

3. The combined mutual inductor according to claim 2, characterized in that: The positioning post (36) is provided with a threaded part, and a fastening nut (37) is threadedly connected in the base (1).

4. The combined mutual inductor according to claim 3, characterized in that: A box cover (23) for covering the terminal block (21) is provided on the secondary junction box (2), and the box cover (23) is detachably fixed to the secondary junction box (2) by screws.

5. The combined mutual inductor according to claim 4, characterized in that: Fixed ears (13) are provided on both sides of the base (1), and fixed long grooves (14) are opened on the fixed ears (13); a bottom case (15) is detachably buckled on the bottom surface of the base (1).

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