Multifunctional current transformer

Abstract

The utility model relates to a multifunctional current transformer which comprises a base, a secondary junction box, a main magnetic core and a closed magnetic core, the base is of a totally-closed hollow structure, and the secondary junction box is integrally formed on the front side of the base; a terminal strip is arranged in the secondary junction box, and a secondary binding post is arranged on the terminal strip; a lug is arranged in the secondary junction box, and an inner threaded hole and an inner threading hole are formed in the lug; the box cover of the secondary junction box is internally provided with concave lugs, the concave lugs are provided with outer threaded holes and outer threading holes which are matched with the inner threaded holes and the inner threading holes, the box cover is fixed on the secondary junction box through screws, and a lead sealing anti-theft rope is arranged between the inner threading holes and the outer threading holes in a penetrating manner. The multifunctional current transformer can measure independent currents of a plurality of phase lines at the same time, and bus cut-off connection or penetrating installation operation does not need to be carried out; and meanwhile, the equipment has an electricity larceny prevention function in a mode of lead sealing and then cover closing and fixing.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology and equipment, and in particular to a multifunctional current transformer. Background Art

[0002] A current transformer is an electrical device that converts a large current into a small current for the instrument to measure the phase current. Existing current transformers have the following shortcomings:

[0003] (1) Each transformer can only be used by the instrument to test one phase line or the total current of multiple phase lines, and cannot measure the individual currents of multiple phase lines separately;

[0004] (2) During installation, the ring-structured current transformer needs to find the busbar end or cut the busbar for installation. The current transformer with its own primary terminal needs to cut the busbar and connect the P1P2 terminal. Both methods have safety hazards. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to overcome the deficiency that the current transformer can only test one phase line or the total current of multiple phase lines, and the defect that the wires need to be threaded or disconnected during installation, and to provide a multifunctional current transformer, which, in addition to having the basic functions of the single-line current or the total current of multiple lines of the traditional current transformer, can simultaneously measure the individual currents of multiple phase lines, without the need to perform busbar disconnection or threading operations, and can buckle the busbar in the annular magnetic core at any position of the busbar to be tested through the split main magnetic core and the closed magnetic core, so that the disassembly and assembly are convenient; at the same time, the structure of the secondary junction box end is optimized, and the device can have the function of preventing electricity theft by first sealing with lead and then fixing with a cover.

[0006] The multifunctional current transformer comprises a base, a secondary junction box arranged on the base, a U-shaped main magnetic core installed in the base and wound with a secondary coil, and a U-shaped closed magnetic core inserted on the base. After the closed magnetic core is inserted, it forms a closed annular magnetic core with the corresponding main magnetic core, wherein the main magnetic core and the closed magnetic core are three pairs in total, which are respectively used to pass through the three phase lines A, B, and C of the busbar to be measured; the base is a fully enclosed hollow structure, and the secondary junction box is integrally formed on the front side of the base; a terminal block is arranged in the secondary junction box, and a secondary terminal post is arranged on the terminal block, Two ends of the secondary coil on the main magnetic core are connected to the corresponding secondary wiring posts on the terminal block; a pair of lugs are provided on both sides of the interior of the secondary wiring box, and internal threaded holes and internal threading holes are opened on the lugs; a box cover for covering the terminal block is provided on the outside of the secondary wiring box, a pair of concave ears are provided on the inside of the box cover, and external threaded holes and external threading holes matching the internal threaded holes and internal threading holes are opened on the concave ears, the box cover is detachably fixed to the secondary wiring box by fixing the internal and external threaded holes with screws, and a lead-sealed anti-theft rope is passed between the internal and external threading holes.

[0007] Furthermore, the base is provided with three pairs of square grooves at the main magnetic core position for accommodating the main magnetic core ends, and the main magnetic core is embedded in the square grooves; the closed magnetic core is externally sheathed with a U-shaped shell, and the closed magnetic core ends extend out of the U-shaped shell.

[0008] Furthermore, the terminal block is provided with three pairs of secondary terminals, and insulating partitions are mounted on both sides of each secondary terminal.

[0009] Furthermore, fixing ears are provided on both sides of the base, and fixing long grooves are opened on the fixing ears; and a bottom shell is detachably buckled on the bottom surface of the base.

[0010] The utility model discloses a multifunctional current transformer, which overcomes the shortcomings of the current transformer that can only test one phase line or the total current of multiple phase lines, and the defect that the current transformer needs to be threaded or disconnected during installation. In addition to the basic functions of the single-line current or the total current of multiple lines of the traditional current transformer, the utility model can simultaneously measure the individual currents of multiple phase lines without the need to perform busbar cut-off connection or threading operations. The busbar can be buckled into the annular magnetic core at any position of the busbar to be tested through the split main magnetic core and the closed magnetic core, and the disassembly and assembly are convenient. At the same time, the structure of the secondary junction box end is optimized, and the device can have the function of preventing electricity theft by first sealing with lead and then fixing with a cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following is a further description of a multifunctional current transformer of the utility model in conjunction with the accompanying drawings:

[0012] Figure 1 This is a front three-dimensional structural schematic diagram of the multifunctional current transformer;

[0013] Figure 2 It is a schematic diagram of the back three-dimensional structure of the multifunctional current transformer;

[0014] Figure 3 yes Figure 1 Schematic diagram of the explosion structure;

[0015] Figure 4 yes Figure 2 Schematic diagram of the explosion structure;

[0016] Figure 5 yes Figure 3 A partial enlarged view of the middle A area;

[0017] Figure 6 yes Figure 4 A partial enlarged view of area B in the middle.

[0018] In the figure:

[0019] 1-base; 11-square slot;

[0020] 2-secondary junction box; 21-terminal block, 22-secondary terminal, 23-convex ear, 24-box cover, 25-concave ear, 26-lead-seal anti-theft rope; 211-insulating partition, 231-internal threaded hole, 232-internal threading hole; 251-external threaded hole, 252-external threading hole;

[0021] 3-main magnetic core; 31-square slot;

[0022] 4-closed magnetic core; 41-U-shaped shell. DETAILED DESCRIPTION

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] The technical solution of the utility model is further described below with specific embodiments, but the protection scope of the utility model is not limited to the following embodiments.

[0026] Implementation method 1: Figures 1 to 6As shown, the multifunctional current transformer comprises a base 1, a secondary junction box 2 arranged on the base 1, a U-shaped main magnetic core 3 installed in the base and wound with a secondary coil, and a U-shaped closed magnetic core 4 inserted on the base 1. After the closed magnetic core 4 is inserted, it forms a closed annular magnetic core with the corresponding main magnetic core 3, wherein the main magnetic core 3 and the closed magnetic core 4 have three pairs, which are respectively used to pass through the three phase lines A, B, and C of the busbar to be measured; the base 1 is a fully enclosed hollow structure, and the secondary junction box 2 is integrally formed on the front side of the base 1; a terminal block 21 is provided in the secondary junction box 2, and a secondary terminal 22 is provided on the terminal block 21, and the secondary terminal 22 on the main magnetic core 3 Both ends of the coil are connected to the corresponding secondary terminals 22 on the terminal block 21; a pair of lugs 23 are provided on both sides of the interior of the secondary junction box 2, and an internal threaded hole 231 and an internal threading hole 232 are opened on the lugs 23; a box cover 24 for covering the terminal block 21 is provided on the outside of the secondary junction box 2, a pair of recessed ears 25 are provided on the inside of the box cover 24, and external threaded holes 251 and external threading holes 252 matching the internal threaded holes 231 and the internal threading holes 232 are opened on the recessed ears 25, the box cover 23 is detachably fixed to the secondary junction box 2 by screwing the internal and external threaded holes, and a lead-sealed anti-theft rope 26 is passed between the internal and external threading holes.

[0027] Implementation 2: The base 1 of the multifunctional current transformer is provided with three pairs of square slots 11 for accommodating the main core ends at the position of the main core 3, and the main core 3 is embedded in the square slots 11; the closed core 4 is externally covered with a U-shaped shell 41, and the ends of the closed core 4 extend out of the U-shaped shell 41. Under this design, the core ring can be closed / disconnected by inserting / pulling out the square slots, and is used to buckle the busbar into / out of the ring core without performing busbar truncation or threading operations. The remaining structures and components are as described in Implementation 1 and will not be described again.

[0028] Embodiment 3: The terminal block 21 of the multifunctional current transformer is provided with three pairs of secondary terminals 22, and insulating partitions 211 are mounted on both sides of each secondary terminal 22. They are used for isolation and insulation of adjacent instrument wiring. The remaining structures and components are as described in Embodiment 1 and will not be described again.

[0029] The multifunctional current transformer overcomes the shortcomings of current transformers that they can only test one phase line or the total current of multiple phase lines, as well as the defect that they need to be threaded or disconnected during installation. In addition to the basic functions of single-line current or multi-line total current of traditional current transformers, the multifunctional current transformer can simultaneously measure the individual currents of multiple phase lines without the need to perform busbar disconnection or threading operations. The busbar can be buckled into the annular core at any position of the busbar to be tested through the split main magnetic core and the closed magnetic core, which is convenient for disassembly and assembly. At the same time, the structure of the secondary junction box end is optimized, and the device can be provided with a function of preventing electricity theft by first sealing with lead and then fixing with a cover.

[0030] When in use: After the instrument is wired in the junction box, the lead-sealed anti-theft rope and the threading hole are used to prevent electricity from being stolen and close the box. Specifically, the lead-sealed anti-theft rope includes a cotton rope and a lead-sealed block. First, insert the cotton rope into the inner threading hole of the box cover, and then insert the other end of the cotton rope into the inner threading holes on the two lugs of the secondary junction box. After the two rope ends are gathered with the lead-sealed block, they are pressed with lead-sealed pliers, and then the cover is closed to store the lead-sealed anti-theft rope in the secondary junction box. The inner and outer threaded holes on the convex and concave ears are fixed with screws to complete the anti-theft closure of the terminal. After removing the screws, maintenance and inspection personnel can cut the cotton rope and open the cover. After the maintenance is completed, fix it with a new lead-sealed anti-theft rope. Since private connection and electricity theft will destroy the lead seal, it is easy to detect.

[0031] The multifunctional current transformer overcomes the defects of the existing multifunctional current transformer's integrated structure leading to high use cost and inconvenient maintenance and repair of the single-phase structure. Its structure adopts the form of modular combination. Each single-phase current transformer is assembled and fixed on the base through insertion and combination, which is convenient for the disassembly, maintenance and replacement of a single-phase current transformer, reducing the use and maintenance costs. The secondary ends of each current transformer are concentrated on the terminal block through hidden wire connections and are shielded. While being safe and beautiful, the terminal layout is regular and clear, which is convenient for instrument wiring operation and later current transformer disassembly, inspection and maintenance.

[0032] The above description shows the main features, basic principles, and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments or embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, the above embodiments or embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the utility model. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multifunctional current transformer, characterized in that: The invention comprises a base (1), a secondary junction box (2) arranged on the base (1), a U-shaped main magnetic core (3) installed in the base and wound with a secondary coil, and a U-shaped closed magnetic core (4) inserted on the base (1); after the closed magnetic core (4) is inserted, it forms a closed annular magnetic core with the corresponding main magnetic core (3); wherein the main magnetic core (3) and the closed magnetic core (4) are three pairs in total, and are respectively used to pass through three phase lines A, B and C of the busbar to be tested; the base (1) is a fully enclosed hollow structure, and the secondary junction box (2) is integrally formed on the front side of the base (1); a terminal block (21) is provided in the secondary junction box (2), and a secondary terminal post (22) is provided on the terminal block (21); and two ends of the secondary coil on the main magnetic core (3) are connected to the corresponding secondary terminal posts (22) on the terminal block (21); A pair of lugs (23) are provided on both sides of the secondary junction box (2), and an internal threaded hole (231) and an internal threading hole (232) are formed on the lugs (23); a box cover (24) for covering the terminal block (21) is provided on the outside of the secondary junction box (2); a pair of recessed lugs (25) are provided on the inside of the box cover (24), and an external threaded hole (251) and an external threading hole (252) matching the internal threaded hole (231) and the internal threading hole (232) are formed on the recessed lugs (25); the box cover (24) is detachably fixed to the secondary junction box (2) by screwing the internal and external threaded holes, and a lead-sealed anti-theft rope (26) is inserted between the internal and external threading holes.

2. The multifunctional current transformer according to claim 1 is characterized in that: The base (1) is provided with three pairs of square grooves (11) for accommodating the ends of the main magnetic core at the position of the main magnetic core (3), and the main magnetic core (3) is embedded in the square grooves (11); the closed magnetic core (4) is externally sheathed with a U-shaped shell (41), and the ends of the closed magnetic core (4) extend out of the U-shaped shell (41).

3. The multifunctional current transformer according to claim 2 is characterized in that: The terminal block (21) is provided with three pairs of secondary connecting posts (22), and insulating partitions (211) are mounted on both sides of each secondary connecting post (22).

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