A current transformer based on epoxy insulation

Abstract

The utility model discloses a current transformer based on epoxy resin insulation, the mutual inductor includes casing, secondary terminal seat and the insulating casting body formed by epoxy resin, the side surface of secondary terminal seat is provided with the clamping slot, and the inside surface of casing is provided with the buckle correspondingly, and the secondary terminal seat is fitted in the casing through the cooperation of clamping slot and buckle, and the insulating casting body is cast in the casing, and the secondary terminal seat is completely embedded into the package casing, and forms a whole module. The utility model adopts epoxy resin as the insulating casting body, and combines the cooperation structure of buckle and clamping slot, solves the time -consuming and labor -intensive, the problem of inaccurate positioning, easy to fall off and the substandard insulating performance of existing technology adopting the paste fixed secondary terminal seat, has the advantages such as convenient installation, accurate positioning, excellent insulating performance, structure stable, further improves the working performance of current transformer.

Description

Technical Field

[0001] This utility model relates to the field of electrical manufacturing technology, specifically to a current transformer based on epoxy resin insulation. Background Technology

[0002] In the field of electrical equipment, current transformers are important electrical components used to convert high current into low current for measurement, protection, and control operations. The secondary terminal block is a key component of the current transformer, and its installation stability and accuracy directly affect the transformer's performance.

[0003] In existing technologies, secondary terminal blocks are typically fixed to the housing using adhesive bonding. This method is not only time-consuming and labor-intensive, but also requires extremely strict dimensional matching, easily leading to problems such as installation failure, misalignment, detachment, and poor fit. Furthermore, traditional insulation materials have shortcomings in insulation performance and heat resistance, affecting the overall performance and service life of the current transformer. Therefore, it is necessary to design a current transformer based on epoxy resin insulation. Utility Model Content

[0004] The purpose of this invention is to provide a current transformer based on epoxy resin insulation to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a current transformer based on epoxy resin insulation, comprising a housing, a secondary terminal block, and an insulating casting body;

[0006] The insulating casting body is an epoxy resin casting body;

[0007] The bottom of the secondary terminal block is open, and a slot is provided on the side of the secondary terminal block. A buckle that mates with the slot is provided on one inner side of the housing. The secondary terminal block is engaged in the housing through the engagement of the slot and the buckle.

[0008] The insulating casting body is cast into the housing, and the secondary terminal block is completely embedded in the housing.

[0009] Preferably, the top of the secondary terminal block has two circular openings, which are secondary terminal through holes, and the bottom of the secondary terminal through holes has two hexagonal slots.

[0010] Preferably, the slots are formed on one side of the secondary terminal block, and the number of slots is two; the buckles are formed on one side of the housing, and the number of buckles is two.

[0011] Preferably, the secondary terminal block includes a main body and a top cover, the top cover being detachably connected to the main body, and the secondary terminal through hole being formed on the top cover.

[0012] Preferably, the outer surface of the housing is provided with heat dissipation fins, which are evenly distributed along the circumference of the housing.

[0013] Preferably, the heat dissipation fins are elongated rectangular thin sheets with a slightly rough texture on the surface; the heat dissipation fins and the housing are integrally injection molded and extend from the top to the bottom of the housing, covering the entire axial length of the housing.

[0014] Beneficial effects:

[0015] (1) This utility model adopts a buckle and slot matching structure to install the secondary terminal block, replacing the traditional glue pasting method. The installation process is simple and quick, saving time and effort, and can achieve precise positioning, effectively avoiding problems such as failure to install, misalignment, and falling off.

[0016] (2) This utility model uses epoxy resin as the insulating casting body. Epoxy resin has excellent insulation properties, heat resistance and chemical stability, which can provide reliable insulation protection for current transformers and extend their service life.

[0017] (3) In this utility model, the top cover of the secondary terminal block is detachably connected to the main body and is provided with a sealing structure, which facilitates inspection and maintenance and enhances the sealing performance.

[0018] (4) In this utility model, the heat dissipation fins on the outer surface of the housing can effectively improve the heat dissipation performance and ensure the working stability of the current transformer.

[0019] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more apparent and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the secondary terminal block of this utility model;

[0022] Figure 3 This is a schematic diagram of the hexagonal slot of this utility model;

[0023] Figure 4 This is a schematic diagram of the heat dissipation fin distribution of this utility model;

[0024] In the diagram: 1. Housing; 2. Secondary terminal block; 3. Slot; 4. Secondary terminal through hole; 5. Hexagonal slot; 6. Main body; 7. Top cover; 8. Heat dissipation fins. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0027] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application 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 application.

[0029] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0032] Please see Figures 1-4 This utility model discloses a current transformer based on epoxy resin insulation, including a housing 1, a secondary terminal block 2 and an insulating casting body. The housing is a circular plastic housing, and the inner side of the housing is provided with a structure for cooperating with the secondary terminal block. The plastic housing has the advantages of light weight and low cost. The secondary terminal block is a rectangular plastic terminal block, specifically made of ABS plastic. ABS plastic has good mechanical properties and processing performance.

[0033] The insulating casting body is an epoxy resin casting body;

[0034] The bottom of the secondary terminal block 2 is open, and a slot 3 is provided on the side of the secondary terminal block 2. A buckle that cooperates with the slot 3 is provided on one inner side of the housing 1. The secondary terminal block 2 is embedded in the housing 1 through the cooperation of the slot 3 and the buckle.

[0035] The insulating casting body is cast into the housing 1, and the secondary terminal block 2 is completely embedded in the housing 1.

[0036] In this utility model, the top of the secondary terminal block 2 has two circular openings, which are secondary terminal through holes 4, for installing secondary inserts so as to connect with external wires. The bottom of the secondary terminal through holes 4 has two hexagonal slots 5, which can effectively prevent the secondary inserts from loosening or rotating.

[0037] In this invention, two slots 3 are formed on one side of the secondary terminal block 2; two buckles are formed on one side of the housing 1. The combination of multiple slots and buckles improves the stability and positioning accuracy of the secondary terminal block installation.

[0038] In this invention, the secondary terminal block 2 includes a main body 6 and a top cover 7. The top cover 7 is detachably connected to the main body 6, and the secondary terminal through hole 4 is formed on the top cover 7. The detachable structure facilitates inspection and maintenance of the interior of the secondary terminal block.

[0039] In this invention, heat dissipation fins 8 are provided on the outer surface of the housing 1, and the heat dissipation fins 8 are evenly distributed along the circumference of the housing 1. The heat dissipation fins 8 are elongated rectangular thin sheets, and the surface of the heat dissipation fins 8 has a slightly rough texture. The heat dissipation fins 8 and the housing 1 are integrally injection molded, and extend from the top to the bottom of the housing 1, covering the entire axial length of the housing. The heat dissipation fins can increase the heat dissipation area, accelerate heat dissipation, and ensure the stability of the current transformer during long-term operation.

[0040] Instructions for use: During installation, first, the secondary terminal block is secured to the housing by engaging the clips on the housing via the slots, achieving initial positioning and fixation. Then, epoxy resin mixed with nano-sized alumina particles is poured into the housing to form an insulating casting. After curing, the secondary terminal block is firmly bonded to the housing and the insulating casting. The secondary insert is installed in the through-hole of the secondary terminal block, and the hexagonal slot at the bottom prevents the secondary insert from loosening or rotating. For maintenance, the top cover can be removed from the main body for easy access.

[0041] In summary, this utility model uses epoxy resin as the insulating casting body, combined with the matching structure of the buckle and the slot, which solves the problems of time-consuming and labor-intensive, inaccurate positioning, easy detachment and poor insulation performance of the secondary terminal block that are fixed by glue in the prior art. It has the advantages of convenient installation, accurate positioning, excellent insulation performance and stable structure, and further improves the working performance of the current transformer.

[0042] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A current transformer based on epoxy resin insulation, characterized in that: It includes a housing (1), a secondary terminal block (2), and an insulating casting body; The insulating casting body is an epoxy resin casting body; The bottom of the secondary terminal block (2) is open, and a slot (3) is provided on the side of the secondary terminal block (2). A buckle that cooperates with the slot (3) is provided on one inner side of the housing (1). The secondary terminal block (2) is embedded in the housing (1) through the cooperation of the slot (3) and the buckle. The insulating casting body is cast into the housing (1), and the secondary terminal block (2) is completely embedded in the housing (1).

2. A current transformer based on epoxy resin insulation according to claim 1, characterized in that: The top of the secondary terminal block (2) has two circular openings, which are secondary terminal through holes (4), and the bottom of the secondary terminal through holes (4) has two hexagonal slots (5).

3. A current transformer based on epoxy resin insulation according to claim 1, characterized in that: The slots (3) are formed on one side of the secondary terminal block (2), and there are two slots; the buckles are formed on one side of the housing (1), and there are two buckles.

4. A current transformer based on epoxy resin insulation according to claim 2, characterized in that: The secondary terminal block (2) includes a main body (6) and a top cover (7). The top cover (7) is detachably connected to the main body (6), and the secondary terminal through hole (4) is opened on the top cover (7).

5. A current transformer based on epoxy resin insulation according to claim 1, characterized in that: The outer surface of the housing (1) is provided with heat dissipation fins (8), which are evenly distributed along the circumference of the housing (1).

6. A current transformer based on epoxy resin insulation according to claim 5, characterized in that: The heat dissipation fins (8) are long rectangular thin sheets with a slightly rough texture on the surface. The heat dissipation fins (8) and the shell (1) are integrally injection molded and extend from the top to the bottom of the shell (1), covering the entire axial length of the shell.

Images