Integrated current transformer for three-phase intelligent electric energy meter

Abstract

The utility model discloses an integrated current transformer for a three-phase intelligent electric energy meter, which comprises a shell, three current transformers are encapsulated in the shell, and secondary lead pins of the three current transformers extend out of the top of the shell at equal intervals in a single row and are in welded connection with a PCB (printed circuit board) in the three-phase intelligent electric energy meter. The primary end copper bars of the three current transformers penetrate through the magnetic cores of the corresponding current transformers, extend out of the outer side of the shell and are connected with the meter terminal box copper columns of the three-phase intelligent electric energy meter in a welded mode. In the welding process, after welding of a certain phase is inclined, the position dislocation of the copper bars at the primary ends of the other two phases of current transformers is increased by more than two times, so that the current transformers can be kept approximately vertical to the welding of the wiring terminals by adjusting the welding positions of the primary copper bars of the three phases, and the inclination deviation angle of a secondary lead pin is reduced. Meanwhile, the secondary lead contact pins of the current transformer adopt an equal-interval single-row pin discharging mode, so that the influence of the inclination deviation of the current transformer body on the positioning of the secondary lead contact pins can be further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent electric energy meter applications, in particular to an integrated current transformer for a three-phase intelligent electric energy meter. Background Art

[0002] At present, with the widespread application of smart electricity meters, the production process of electricity meters is changing with each passing day, gradually moving from labor-intensive to automated production. The installation of current transformers has also moved from screw fixing and secondary lead soft wire connection to brazing and secondary lead pin welding.

[0003] Commonly used three-phase smart energy meters require the installation of three current transformers for measuring the A, B, and C phase currents. After the current transformers are welded to the meter terminal box, welding tolerances and offsets prevent the secondary lead pins from extending to the corresponding position for fixation, making installation difficult. Utility Model Content

[0004] The purpose of this application is to provide an integrated current transformer for a three-phase smart electricity meter to solve the current problem that after the current transformer is welded to the terminal box of the electricity meter, the secondary lead pins cannot be extended to the corresponding position for fixation due to welding tolerance and offset, causing installation difficulties.

[0005] To solve the above technical problems, the present application provides an integrated current transformer for a three-phase smart energy meter, comprising:

[0006] The shell has three current transformers embedded therein. The secondary lead pins of the three current transformers extend from the top of the shell in a single row with equal spacing and are welded to the PCB board inside the three-phase smart energy meter. The primary copper bars of the three current transformers pass through the corresponding magnetic cores of the current transformers and extend outside the shell, and are welded to the copper columns of the meter terminal box of the three-phase smart energy meter.

[0007] Based on the above embodiment, as a preferred implementation manner, a partition is further provided in the housing to separate the three current transformers.

[0008] Based on the above embodiment, as a preferred implementation manner, the secondary lead pins and the primary copper bar are respectively arranged on opposite sides of the housing.

[0009] What needs to be explained in detail in the solution is that the primary end copper bar is fixed to the copper column of the meter end button box by brazing.

[0010] Compared to the prior art, the present invention provides an integrated current transformer for a three-phase smart energy meter, comprising a housing, within which three current transformers are encapsulated, i.e., the housing and the three current transformers are integrally formed. The secondary lead pins of the three current transformers extend from the top of the housing in a single row with equal spacing and are welded to the PCB board inside the three-phase smart energy meter. The primary copper bars of the three current transformers pass through the magnetic cores of the corresponding current transformers and extend outside the housing, and are welded to the copper posts of the meter terminal box of the three-phase smart energy meter. During the welding process, if one phase is tilted, the positional misalignment of the primary copper bars of the other two phases of the current transformers will increase by more than 2 times. Therefore, by adjusting the welding position of the three-phase primary copper bars, the current transformers can be kept nearly perpendicular to the terminal welding, reducing the tilt deviation angle of the secondary lead pins. At the same time, the secondary lead pins of the current transformer adopt an evenly spaced single-row pin arrangement, which can further reduce the impact of the tilt deviation of the current transformer body on the positioning of the secondary lead pins. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without inventiveness.

[0012] Figure 1 A schematic structural diagram of an integrated current transformer for a three-phase smart energy meter provided in an embodiment of the present application;

[0013] Figure 2 A schematic diagram of the internal structure of a housing provided in an embodiment of the present application;

[0014] In the figure: 1. Housing; 2. Current transformer; 3. Secondary lead pins; 4. Primary copper bar; 5. Partition. DETAILED DESCRIPTION

[0015] In order to enable people skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0016] The core of this application is to provide an integrated current transformer for a three-phase smart electricity meter, which solves the current problem that after the current transformer is welded to the terminal box of the electricity meter, the secondary lead pins cannot be extended to the corresponding position for fixation due to welding tolerance and offset, causing installation difficulties.

[0017] Figure 1 This is a schematic diagram of the structure of an integrated current transformer for a three-phase smart energy meter provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the internal structure of a housing provided in an embodiment of the present application, see Figures 1 to 2 shown.

[0018] Example 1

[0019] An integrated current transformer for a three-phase smart electric energy meter includes a shell 1. The shape and size of the shell 1 can be determined according to actual conditions. The shell 1 can be made of heat-resistant and flame-retardant materials. Three current transformers 2 are encapsulated in the shell 1, that is, the three current transformers 2 are encapsulated in the shell 1 at the same time to form an integrated structure. After installation, the secondary lead pins 3 of the three current transformers 2 extend from the top of the shell 1 in a single row with equal intervals, and the secondary lead pins 3 are welded and connected to the PCB board inside the three-phase smart electric energy meter. The PCB board is not drawn in the figure. The primary copper bars 4 of the three current transformers 2 pass through the corresponding magnetic cores of the current transformers 2 and extend outside the shell 1. For example, the primary copper bar 4 on the current transformer A passes through the magnetic core of the current transformer A and extends outside the shell 1. The primary copper bar 4 is welded and connected to the copper column of the meter terminal button box of the three-phase smart electric energy meter. The copper column of the meter terminal button box is not drawn in the figure. The present invention can solve the problem that when welding the current transformer at the terminal of a three-phase smart energy meter, the current transformer 2 is tilted at a certain angle due to the tolerance of the welding tooling, the actual tolerance of the current transformer and the tolerance of the terminal. When welding a separate current transformer 2 for each phase, the welding deviation is difficult to correct when the tilt angle is small.

[0020] Example 2

[0021] On the basis of Example 1, an integrated current transformer for a three-phase smart energy meter is provided. In order to avoid mutual influence between the current transformers 2 , preferably, a partition 5 is further provided in the housing 1 to separate the three current transformers 2 .

[0022] On the basis of Example 1, an integrated current transformer 2 for a three-phase smart energy meter can preferably be provided on opposite sides of a housing 1 to improve welding convenience.

[0023] On the basis of Example 1, an integrated current transformer 2 for a three-phase smart electric energy meter is provided. To improve the welding effect, preferably, the primary copper bar 4 is fixed to the copper column of the meter terminal button box by brazing.

[0024] The utility model provides an integrated current transformer for a three-phase smart energy meter, comprising a housing 1, within which three current transformers 2 are encapsulated. Specifically, the housing 1 and the three current transformers 2 are integrally formed. The secondary lead pins 3 of the three current transformers 2 extend from the top of the housing 1 in a single row, spaced evenly apart, and are welded to the PCB of the three-phase smart energy meter. The primary copper bars 4 of the three current transformers 2 pass through the magnetic cores of the corresponding current transformers 2, extend outside the housing 1, and are welded to the copper posts of the meter terminal box of the three-phase smart energy meter. During the welding process, if the welding of one phase is tilted, the positional misalignment of the primary copper bars 4 of the other two phases of the current transformers 2 increases by more than two times. This allows the welding positions of the three-phase primary copper bars to be adjusted so that the current transformers 2 remain nearly perpendicular to the terminal blocks, thereby reducing the tilt deviation angle of the secondary lead pins 3. Furthermore, the secondary lead pins 3 of the current transformer 2 are arranged in a single row, spaced evenly apart, further reducing the effect of the tilt deviation of the current transformer 2 on the positioning of the secondary lead pins 3.

[0025] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope of this application is indicated by the claims.

[0026] It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. An integrated current transformer for a three-phase smart energy meter, characterized in that: include: A shell (1) is provided, wherein three current transformers (2) are encapsulated in the shell (1), secondary lead pins (3) of the three current transformers (2) extend from the top of the shell (1) in a single row at equal intervals and are welded to a PCB board inside a three-phase smart electric energy meter, and primary copper bars (4) of the three current transformers (2) pass through the corresponding magnetic cores of the current transformers (2) and extend outside the shell (1), and are welded to copper columns of a meter terminal box of the three-phase smart electric energy meter.

2. The integrated current transformer (2) for a three-phase smart electric energy meter according to claim 1, characterized in that: A partition (5) is also provided in the housing (1) to separate the three current transformers (2).

3. The integrated current transformer (2) for a three-phase smart electric energy meter according to claim 1, characterized in that: The secondary lead pins (3) and the primary end copper bars (4) are arranged on opposite sides of the housing (1).

4. The integrated current transformer (2) for a three-phase smart electric energy meter according to claim 1, characterized in that: The primary end copper bar (4) is fixed to the copper column of the meter end button box by brazing.

Images