Integrated three-phase winding straight-through type current transformer

Abstract

The utility model relates to the technical field of transformers, in particular to a three-phase current transformer, which comprises an integrated three-phase winding straight-through current transformer, the integrated three-phase winding straight-through current transformer comprises a shell, and the shell is provided with three through holes arranged in parallel; three coils are further included, and each through hole is sleeved with one coil; each coil is provided with two wiring terminals, and the wiring terminals are fixed to the side face of the shell and penetrate out of the shell. The shell is also provided with a mounting seat for mounting the shell; soft magnetic sheets used for magnetic field isolation are further arranged between the coils. The three current transformers are integrated together, only one installation position is needed, the use space is reduced, installation is simpler and more convenient, the soft magnetic sheets are further arranged among the coils, mutual inductance among the coils is reduced, and the influence of the mutual inductance of the coils on measurement is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a three-phase current transformer. Background Art

[0002] A three-phase circuit is a circuit system consisting of three power sources or loads. In industry and power systems, three-phase circuits are very common. In a three-phase circuit, a current transformer is a device used to measure current. It is usually used in power systems. It can transform high current into low current for easy measurement and monitoring.

[0003] The current transformer is generally connected to the electric energy meter in the distribution cabinet. In a three-phase circuit, three identical current transformers are usually required to measure the current of each phase. Using general current transformers requires installing three in the distribution cabinet, but the small space in the distribution cabinet makes the installation of the current transformer difficult. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] An integrated three-phase winding through-core current transformer, characterized in that:

[0008] It comprises a housing, wherein the housing is provided with three through holes arranged in parallel;

[0009] It also includes a coil, wherein three coils are provided, and each through hole is provided with one coil;

[0010] Each of the coils is provided with two wiring terminals, which are fixed to the side of the housing and protrude from the housing;

[0011] A mounting seat is also provided on the lower side of the housing;

[0012] A soft magnetic sheet for magnetic field isolation is also arranged between the coils.

[0013] Firstly, the utility model optimizes the structure of the integrated three-phase winding through-type current transformer. After the optimization, three coils are arranged in the shell, so that the three circuits in the three-phase circuit pass through the coils through the through holes respectively, and the three current transformers are integrated together. Only one installation position is required, which reduces the usage space and makes the installation easier. Secondly, soft magnetic sheets are arranged between the coils to reduce the mutual inductance between the coils, reduce the influence of the mutual inductance of the coils on the measurement, and improve the accuracy and stability of the current transformer. A mounting base is also used for installation to better fix the shell in the distribution cabinet.

[0014] Preferably, the width of the soft magnetic sheet is greater than the height of the coil; the utility model optimizes the structure of the integrated three-phase winding through-type current mutual inductance. After the optimization, the width of the soft magnetic sheet is greater than the height of the coil, and the soft magnetic sheet can better cover the coil, thereby improving the isolation effect.

[0015] Preferably, the soft magnetic sheet is arranged in an arc shape wrapping the coil; the utility model optimizes the structure of the soft magnetic sheet, after which the area of ​​the soft magnetic sheet wrapping the coil is increased to reduce the leakage of the magnetic field, further improving the isolation effect.

[0016] Preferably, the material of the soft magnetic sheet is ferrite, and the thickness of the soft magnetic sheet is 0.1-2 mm; the utility model optimizes the structure of the integrated three-phase winding through-type current transformer. After the optimization, the soft magnetic sheet of the coil uses ferrite material, which has good soft magnetic properties and insulation properties.

[0017] Preferably, the shell is filled with resin; the utility model optimizes the structure of the shell, and after the optimization, the shell is filled with resin to fix its internal structure to ensure the stability of the overall structure.

[0018] Preferably, the mounting seat is provided with slide grooves on two opposite sides, the slide grooves are matched with fixed plates, and the fixed plates are provided with mounting holes; the utility model optimizes the structure of the mounting seat, and after the optimization, the position of the fixed plate of the mounting seat is adjustable, which increases the flexibility of the mounting seat and makes the current transformer easier to install in the distribution cabinet.

[0019] Preferably, the fixing plate is further provided with a sliding block matched with the sliding groove, a positioning hole is provided on the side of the sliding block, a positioning bolt is threadedly provided in the positioning hole, and a gasket is provided on the positioning bolt sleeve.

[0020] Preferably, the mounting seat has a positioning groove along the slide groove, the positioning bolt passes through the positioning groove, and the gasket is arranged on the outside of the positioning groove; the utility model optimizes the structure of the mounting seat, and after the optimization, the fixing plate of the mounting seat can fix the position, making the structure of the mounting seat more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0022] Figure 1 A schematic diagram of the overall structure of an integrated three-phase winding through-type current transformer according to an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the internal structure of an integrated three-phase winding through-type current transformer according to an embodiment of the utility model;

[0024] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a fixed plate in an integrated three-phase winding through-core current transformer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figure 1-2 , this embodiment provides an integrated three-phase winding through-core current transformer including.

[0031] The invention comprises a housing 102, which is provided with three through holes 102a arranged in parallel; further comprises a coil 101, which is provided with three coils 101, each through hole 102a is provided with a coil 101; each coil 101 is provided with two connecting terminals 101a, and the connecting terminals 101a are fixed to the side of the housing 102 and penetrate from the housing 102; a mounting seat 102b is also provided on the lower side of the housing 102; a soft magnetic sheet 101b is also provided between adjacent coils 101; three power lines of the three-phase circuit pass through the housing respectively The three through holes on 102 connect the electric energy meter to the three coil 101 terminals. Soft magnetic sheets are also arranged between the coils 101 to reduce the mutual inductance between the coils 101, reduce the influence of the mutual inductance of the coils 101 on the measurement, and improve the accuracy and stability of the current transformer. The terminal 101a of each coil 101 is divided into S1 terminal 101a and S2 terminal 101a. The material of the shell 102 is ABS plastic, and the material of the mounting base 102b is iron. The mounting base 102b is cast and connected to the shell 102 as a whole.

[0032] The width of the soft magnetic sheet 101b is greater than the height of the coil 101, and the width of the soft magnetic sheet is greater than the height of the coil. The soft magnetic sheet can better cover the coil, thereby improving the isolation effect.

[0033] The soft magnetic sheet 101 b is configured to be in an arc shape that wraps around the coil 101 . The area of ​​the soft magnetic sheet wrapping around the coil is increased to reduce the leakage of the magnetic field, thereby further improving the isolation effect.

[0034] The material of the soft magnetic sheet 101b is ferrite, and the thickness of the soft magnetic sheet 101b is 0.1-2 mm. The ferrite soft magnetic sheet is a common soft magnetic sheet material, and has good soft magnetic properties and insulation properties.

[0035] The housing 102 is filled with resin cast therein, which wraps the coil and improves the mechanical strength and stability of the overall structure of the current transformer, and also improves the voltage resistance of the current transformer and increases the safety of the equipment.

[0036] First, the three coils 101 are placed in the shell 102 with the mounting base 102b installed, and each through hole 102a is provided with a coil, and then the empty slot of the shell 102 is filled with resin, and the integrated three-phase winding through-type current transformer is completed after the resin is cooled and solidified; when in use, the current transformer is fixed to the distribution cabinet with the mounting base 102b, and the s1 terminals 101a are connected to fuses, and the three power lines of the three-phase circuit are respectively passed through the three through holes on the shell 102, and then the s2 terminals 101a of the three coils 101 are connected to the electric energy meter, and the other end of the fuse is connected to the electric energy meter, and then the three s2 terminals 101a are connected in series to ground, and the integrated three-phase winding through-type current transformer is installed.

[0037] Example 2

[0038] Reference Figure 1 to Figure 3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0039] The mounting seat 102b is provided with slide grooves 102b-1 on opposite sides, and the slide grooves 102b-1 are matched with fixed plates 102b-2, and the fixed plates 102b-2 are provided with mounting holes; the fixed plates 102b-2 can slide in the slide grooves 102b-1, so that the position of the fixed plates 102b-2 can be flexibly adjusted, and then fixed with bolts through the mounting holes.

[0040] The fixing plate 102b-2 is also provided with a sliding block matched with the sliding groove 102b-1, a positioning hole is provided on the side of the sliding block, a positioning bolt is provided in the threaded part of the positioning hole, and a gasket is provided on the positioning bolt sleeve.

[0041] The mounting seat 102b has a positioning groove along the slide groove 102b-1, the positioning bolt passes through the positioning groove, and the gasket is arranged on the outside of the positioning groove; the diameter of the gasket is larger than the width of the positioning groove, and the position of the fixing plate 102b-2 can be fixed by using the positioning bolt passing through the positioning groove and the gasket arranged on the outside of the positioning groove.

[0042] When in use, loosen the positioning bolt without removing it, slide the fixing plate 102b-2 in the slide groove 102b-1 to the appropriate position and fix it, then fix the integrated three-phase winding through-type current transformer in the distribution cabinet with bolts through the mounting holes on the mounting base 102b. If the position of the integrated three-phase winding through-type current transformer needs to be fine-tuned, you can also loosen the positioning bolt a little, directly push the outer shell 102 to adjust the position of the integrated three-phase winding through-type current transformer, and finally tighten the positioning bolt.

[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present utility model, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0044] Additionally, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described, ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0045] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An integrated three-phase winding through-type current transformer, characterized in that: It comprises a housing (102), wherein the housing (102) is provided with three through holes (102a) arranged in parallel; It also includes a coil (101), wherein three coils (101) are provided, and each through hole (102a) is sleeved with one coil (101); Each coil (101) is provided with two connection terminals (101a), and the connection terminals (101a) are fixed to the side of the housing (102) and protrude from the housing (102); A mounting seat (102b) is also provided on the lower side of the housing (102); A soft magnetic sheet (101b) for magnetic field isolation is also provided between the coils (101).

2. The integrated three-phase winding through-core current transformer according to claim 1, characterized in that: The width of the soft magnetic sheet (101b) is greater than the height of the coil (101).

3. The integrated three-phase winding through-core current transformer according to claim 2, characterized in that: The soft magnetic sheet (101b) is arranged in an arc shape that wraps around the coil (101).

4. The integrated three-phase winding through-core current transformer according to claim 3 is characterized in that: The material of the soft magnetic sheet (101b) is ferrite, and the thickness of the soft magnetic sheet (101b) is 0.1-2 mm.

5. The integrated three-phase winding through-core current transformer according to claim 4, characterized in that: The housing (102) is filled with resin.

6. The integrated three-phase winding through-core current transformer according to claim 5, characterized in that: The mounting seat (102b) is provided with sliding grooves (102b-1) on opposite sides, the sliding grooves (102b-1) are matched with fixed sheets (102b-2), and the fixed sheets (102b-2) are provided with mounting holes.

7. The integrated three-phase winding through-core current transformer according to claim 6, characterized in that: The fixing plate (102b-2) is also provided with a sliding block matched with the sliding groove (102b-1), a positioning hole is provided on the side of the sliding block, a positioning bolt is provided in threaded cooperation with the positioning hole, and a gasket is provided on the positioning bolt sleeve.

8. The integrated three-phase winding through-core current transformer according to claim 7, characterized in that: The mounting seat (102b) is provided with a positioning groove along the slide groove (102b-1), the positioning bolt passes through the positioning groove, and the gasket is arranged outside the positioning groove.

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