Three-phase current transformer

Abstract

The utility model provides a three-phase current transformer in signal connection with a functional module through a signal line, which relates to the field of electric energy meter verification and comprises a control panel, a transformer assembly and a shell. The transformer assembly is electrically connected to the control panel; the shell comprises a first shell and a second shell, and the second shell is connected to the first shell; the first shell and the second shell jointly define an installation cavity, and the transformer assembly and the control panel are both contained in the installation cavity and arranged in the first direction. The first shell is provided with a signal hole through which a signal line passes; the second housing is separable from the first housing to expose the control board. According to the embodiment of the three-phase current transformer, a worker can enable a signal line to penetrate through the mounting hole of the first shell, so that the three-phase current transformer is in signal connection with the functional module in a working state, and the second shell is not limited by the signal line after being detached, so that the second shell can be completely separated from the first shell; and a worker can maintain the control panel more conveniently.

Description

Technical Field

[0001] The utility model relates to the field of electric energy meters, in particular to a three-phase current transformer. Background Art

[0002] In related technologies, automated calibration lines for three-phase smart energy meters can automatically perform calibration operations using an automatic calibration device. The automatic calibration device includes a three-phase current transformer, which is used to isolate current and voltage.

[0003] The existing three-phase current transformer includes a housing, a control panel and a transformer assembly. The housing is used to accommodate and protect the control panel and the transformer assembly. The control panel is used to communicate with the transformer assembly. The transformer assembly is connected to the functional module via a signal line.

[0004] The housing is divided into an upper shell and a lower shell, wherein the upper shell has a signal hole for passing the signal line; after the upper shell of the above solution is separated from the lower shell, it will be constrained by the signal line and difficult to move, making it difficult for staff to inspect and repair the control panel. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a three-phase current transformer that can facilitate the maintenance of a control panel by a worker.

[0006] A three-phase current transformer according to an embodiment of the first aspect of the present utility model includes:

[0007] Control panel;

[0008] a transformer assembly, electrically connected to the control board;

[0009] The housing includes a first shell and a second shell, the second shell is connected to the first shell; the first shell and the second shell jointly define a mounting cavity, the transformer assembly and the control board are both accommodated in the mounting cavity and are both connected to the first shell; the first shell has a signal hole for allowing a signal line to pass through; the second shell can be separated from the first shell to expose the control board.

[0010] The three-phase current transformer according to the embodiment of the present invention has at least the following beneficial effects: the staff can pass the signal line through the mounting hole of the first shell to achieve signal connection between the three-phase current transformer and the functional module in the working state, and then the second shell will not be constrained by the signal line after being disassembled and can move freely relative to the first shell, making it more convenient for the staff to inspect and repair the control panel.

[0011] According to some embodiments of the present invention, the first shell includes a first shell portion and a second shell portion; the second shell portion is connected to the first shell portion and can be separated relative to the first shell portion; the transformer assembly and the control board are both connected to the first shell portion, and the second shell portion has the signal hole.

[0012] According to some embodiments of the present invention, the first shell portion includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate; the second shell portion and the second shell are plate-shaped structures; the second shell and the fourth connecting plate are arranged opposite to each other;

[0013] In the direction from the second shell to the fourth connecting plate, one end of the first connecting plate is connected to the second shell, the other end of the first connecting plate is connected to the fourth connecting plate, one end of the second connecting plate is connected to the second shell, the other end of the second connecting plate is close to the fourth connecting plate, one end of the third connecting plate is connected to the second shell, the other end of the third connecting plate is connected to the fourth connecting plate, one end of the second shell portion is connected to the second shell, the other end of the second shell portion is connected to the fourth connecting plate, the first connecting plate, the second connecting plate, the third connecting plate and the second shell portion surround the second shell and the fourth connecting plate, and are connected end to end in a clockwise direction;

[0014] The first connecting plate, the second connecting plate, the third connecting plate, the fourth connecting plate, the second shell portion and the second housing together define the installation cavity.

[0015] According to some embodiments of the present invention, the first shell has a first opening, the first opening is connected to the installation cavity, the second shell covers the first opening and is connected to the first shell, and the control board is located on a side of the installation cavity close to the second shell.

[0016] According to some embodiments of the present invention, on a projection plane perpendicular to the direction of the first opening, the area enclosed by the edge of the first opening has a first projection on the projection plane, and the control panel has a second projection on the projection plane, and the first projection overlaps with the second projection.

[0017] According to some embodiments of the present invention, the control board includes a substrate and an electronic component; along the direction of the first opening, the electronic component is connected to a side of the substrate close to the second shell.

[0018] According to some embodiments of the present invention, the transformer assembly is located on a side of the control board facing away from the second housing.

[0019] According to some embodiments of the present invention, the housing further includes an isolation plate connected to the first shell; the isolation plate is located between the control board and the transformer assembly.

[0020] According to some embodiments of the present invention, the isolation plate includes an isolation body and a support portion, the isolation body is connected to the support portion; the support portion protrudes toward the second shell relative to the isolation body, and the support portion is closer to the second shell than the control panel.

[0021] According to some embodiments of the present invention, the first shell has a first opening, the second shell covers the first opening and is connected to the first shell, and the first opening is connected to the installation cavity; the isolation plate has a second opening; along the direction of the first opening, the control panel is arranged to avoid the second opening; on a certain projection plane perpendicular to the direction of the first opening, the area enclosed by the edge of the first opening has a first projection on the projection plane, the area enclosed by the edge of the second opening has a second projection on the projection plane, and the transformer assembly has a third projection on the projection plane, and the first projection, the second projection and the third projection overlap.

[0022] According to some embodiments of the present invention, the housing further includes a mounting portion, which is connected to the first shell and is used to be mounted on a support plane.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is an overall schematic diagram of a three-phase current transformer according to some embodiments of the present utility model;

[0026] Figure 2 for Figure 1 Exploded diagram of a three-phase current transformer;

[0027] Figure 3 for Figure 2 Schematic diagram of the three-phase current transformer without the control board and transformer assembly;

[0028] Figure 4 for Figure 3 Schematic diagram of the first shell.

[0029] Reference numerals:

[0030] Three-phase current transformer 10;

[0031] Control board 100, substrate 110, electronic components 120;

[0032] Transformer assembly 200;

[0033] The outer shell 300, the first shell 310, the first shell part 311, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell part 312, the first opening 313, the second shell 320, the mounting cavity 330, the signal hole 340, the isolation plate 350, the isolation body 351, the support part 352, the second opening 353, the clamping plate 360, and the mounting part 370. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0039] In the related art, the automated calibration pipeline for three-phase smart electric energy meters can automatically perform calibration operations through an automatic calibration device, thereby automatically testing the accuracy of the electric energy meter. The automatic calibration device includes a three-phase current transformer 10 and a standard three-phase electric energy meter. The standard three-phase electric energy meter can be used as a standard for calibrating other electric energy meters that need to be tested. The three-phase current transformer 10 is used to isolate the current and voltage of the standard three-phase electric energy meter. The automatic calibration device also includes multiple functional modules that communicate with the three-phase current transformer 10, such as a calibration module, a control module, and an acquisition module. The calibration module can calibrate the electric energy meter that needs to be tested based on the current and voltage isolated by the three-phase current transformer 10. The control module can adjust the parameters, execution actions, etc. of the automatic calibration device according to the current and voltage isolated by the three-phase current transformer 10. The communication module can collect the current and voltage isolated by the three-phase current transformer 10 and exchange data with other control terminals.

[0040] In order to achieve communication between the functional module of the automatic verification device and the three-phase current transformer 10, a signal line needs to be set between the functional module and the three-phase current transformer 10. One end of the signal line is physically connected to the three-phase current transformer 10, and the other end of the signal line is physically connected to the functional module of the automatic verification device, so that the three-phase current transformer 10 can transmit signals to the functional module of the automatic verification device via the signal line.

[0041] The three-phase current transformer 10 includes a housing 300, a control board 100, and a transformer assembly 200. The housing 300 is used to accommodate and protect the control board 100 and the transformer assembly 200. The housing 300 is divided into an upper shell and a lower shell. The upper shell has a signal hole 340, and the transformer assembly 200 and the control board 100 are both connected to the lower shell. The control board 100 is used to communicate with the transformer assembly 200. The specific process of physically connecting the three-phase current transformer 10 to the signal line is as follows: one end of the signal line first passes through the signal hole 340 in the upper shell, enters the space accommodating the transformer assembly 200 and the control board 100, and then connects to the transformer assembly 200. Because the transformer assembly 200 is connected to the lower shell, the signal line connected to the transformer assembly 200 is also indirectly physically connected to the lower shell.

[0042] When maintenance is required on the control panel 100, the upper housing must be disassembled to separate it from the lower housing. This allows for relative movement of the upper housing relative to the lower housing, thereby increasing the visibility of the control panel 100 and facilitating maintenance. However, since one end of the signal line passes through the signal hole 340 and is indirectly physically connected to the lower housing, the signal line comes into contact with the upper housing during separation, affecting the movement of the upper housing relative to the lower housing. This makes movement of the upper housing relative to the lower housing more laborious and is limited by the signal line in a direction perpendicular to the signal line's extension, making it difficult for the operator to separate the upper and lower housings, and consequently, difficult to perform maintenance on the control panel 100.

[0043] In view of this, please refer to Figure 1 、 Figure 2 As shown, the present invention provides a three-phase current transformer 10 , which includes a control board 100 , a transformer assembly 200 and a housing 300 .

[0044] The transformer assembly 200 of the present invention can generate corresponding voltage and current through electromagnetic induction according to the voltage and current of the standard three-phase electric energy meter, thereby enabling the signal line to receive the corresponding voltage and current, and transmit the corresponding electrical signal to the functional module of the automatic calibration device. In some embodiments, the transformer assembly 200 includes a plurality of power frequency transformers, and the transformer assembly 200 uses the plurality of power frequency transformers to isolate the current and voltage of different phases of the standard three-phase electric energy meter, thereby obtaining accurate information of the standard three-phase electric energy meter. For example, in some embodiments, the transformer assembly 200 includes three power frequency transformers, and each power frequency transformer isolates the current and voltage of one phase of the standard three-phase electric energy meter; each power frequency transformer corresponds one-to-one to each phase of the standard three-phase electric energy meter that needs to be isolated.

[0045] The control board 100 of the present invention is electrically connected to the transformer assembly 200 to adjust the various electrical parameters of the transformer assembly 200. When the transformer assembly 200 isolates the current and voltage of the standard three-phase electric energy meter, the current and voltage values ​​generated by the transformer assembly 200 are changed. This allows the current and voltage induced by the transformer assembly 200 to better reflect the actual values ​​of the voltage and current of the standard three-phase electric energy meter, thereby increasing the accuracy of the calibration of the three-phase smart electric energy meter. In some embodiments, please refer to Figure 2 As shown, the control board 100 includes a substrate 110 for transmitting electrical signals and electronic components 120 for processing electrical signals. The electronic components 120 are arranged on the substrate 110. The types of electronic components 120 include but are not limited to resistors, capacitors, transistors, control chips, connector structures, etc. Without departing from the inventive concept of the present utility model, the control board 100 may include a variety of different electronic components 120.

[0046] The housing 300 of the present invention includes a first housing 310 and a second housing 320, with the second housing 320 connected to the first housing 310. The first housing 310 and the second housing 320 together define a mounting cavity 330. The housing 300 protects objects placed within the mounting cavity 330, thereby ensuring that the electrical characteristics of the objects placed within the mounting cavity 330 are not disturbed by external factors, and providing a stable operating environment for the objects placed within the mounting cavity 330.

[0047] The transformer assembly 200 and the control board 100 of the present invention are both accommodated in the mounting cavity 330 and are both connected to the first housing 310. Connecting the transformer assembly 200 and the control board 100 to the first housing 310 is beneficial to maintaining the stability of the transformer assembly 200 and the control board 100 when the three-phase current transformer 10 is working. Without departing from the inventive concept of the present invention, the transformer assembly 200 and the control board 100 can be directly connected to the first housing 310 by fasteners such as pins, bolts, snaps, etc., and can also be indirectly connected to the first housing 310. Taking the transformer assembly 200 as an example of indirect connection, please refer to Figure 2 、 Figure 3 As shown, the three-phase current transformer 10 further includes a plurality of clamping plates 360, which are connected to the first housing 310 and divide the mounting cavity 330 into a plurality of subspaces in the front-to-back direction. The transformer assembly 200 includes a plurality of power-frequency transformers, each of which is placed in a different subspace. The clamping plates 360 cooperate with the first housing 310 to limit the movement of the power-frequency transformers within the mounting cavity 330, thereby reducing movement of the power-frequency transformers within the mounting cavity 330. The aforementioned cooperative relationship between the clamping plates 360, the first housing 310, and the transformer assembly 200 should be considered an embodiment of an indirect connection.

[0048] The first housing 310 of the present invention has a signal hole 340 for passing the signal line. Thus, one end of the signal line can enter the mounting cavity 330 through the signal hole 340 and form a physical connection with the transformer assembly 200, so that the transformer assembly 200 can be connected to the functional module of the automatic calibration device through the signal line signal. It should be noted that the first housing 310 can be provided with multiple signal holes 340 for passing the signal line. In some embodiments, please refer to Figure 1As shown, the transformer assembly 200 includes three industrial frequency transformers, and the first shell 310 has three signal holes 340 for signal lines to pass through. Multiple signal lines can extend into the installation cavity 330 through different signal holes 340 and form physical connections with different industrial frequency transformers. In the subsequent maintenance of the three-phase current transformer 10, the staff can judge that a signal line is connected to a certain industrial frequency transformer corresponding to the signal hole 340 passed through by a certain signal line entering the signal hole 340.

[0049] The second shell 320 of the present invention can be separated from the first shell 310 to expose the control board 100. It should be noted that the "second shell 320 can be separated from the first shell 310" mentioned in the present invention means that the second shell 320 can move relative to the first shell 310, and in the process of relative movement with the first shell 310, the first opening 313 defined by the first shell 310 is opened. In some embodiments, the second shell 320 is rotatably connected to the first shell 310, and when the staff rotates the second shell 320 relative to the first shell 310, the first opening 313 originally covered by the second shell 320 is opened. In other embodiments, the second shell 320 is slidably connected to the first shell 310, and when the staff pushes the second shell 320 to move the second shell 320 relative to the first shell 310, the first opening 313 originally covered by the second shell 320 is opened. As a preferred embodiment, please refer to Figure 1 、 Figure 2 As shown, the second shell 320 is detachably connected to the first shell 310 by fasteners. After the fasteners are removed, the second shell 320 can move freely relative to the first shell 310. The staff can place the second shell 320 in other positions to open the first opening 313 originally covered by the second shell 320, thereby facilitating subsequent operations by the staff.

[0050] On the other hand, the “exposing the control board 100” mentioned in the present invention means that when the first opening 313 formed in the first shell 310 is opened, the installation cavity 330 defined by the second shell 320 and the first shell 310 is connected to the outside through the first opening 313, and the staff can visually see at least part of the control board 100 in the installation cavity 330 through the first opening 313.

[0051] Through the above solution, when the staff needs to inspect the control board 100, the second shell 320 moves relative to the first shell 310. Since the signal hole 340 is set on the first shell 310, the second shell 320 does not have a signal hole 340 for the signal line to pass through. In order to open the first opening 313 so that at least part of the control board 100 can be visually viewed through the first opening 313, in the process of moving the second shell 320, the second shell 320 will not contact the signal line and be affected by the force of the signal line. The staff can move the second shell 320 more labor-saving, and thus it is easier to inspect the control board 100.

[0052] For further information, please refer to Figure 2 As shown, in some embodiments, the first housing 310 includes a first housing portion 311 and a second housing portion 312. The second housing portion 312 is connected to the first housing portion 311 and can be separated from the first housing portion 311.

[0053] The “second shell 312 can be separated from the first shell 311” mentioned in the present invention means that the second shell 312 can move relative to the first shell 311 and open the opening defined by the first shell 311 during the relative movement with the first shell 311. For example, please refer to Figure 2 As shown, in some embodiments, the second housing 312 is detachably connected to the first housing 311, and the second housing 320 and the first housing 311 together define a housing opening. A worker can remove the second housing 312 to open the housing opening previously covered by the second housing 312. This solution allows the housing opening to be opened by separating the second housing 312 from the first housing 311, allowing workers to access the control board 100 or transformer assembly 200 through the housing opening.

[0054] It should be noted that, in the case where the housing 300 defines multiple openings, whether the housing opening is opened depends only on whether the second housing 312 moves relative to the first housing 311. For example, in some embodiments, the second housing 312 is detachably connected to the first housing 311 and defines the first opening 313 together with the first housing 311, and the second housing 320 is detachably connected to the first housing 311 and defines the housing opening together with the first housing 311. After the staff removes the second housing 312, regardless of whether the second housing 320 is separated from the first housing 311, the housing opening should be considered to be in an open state. In some embodiments, please refer to Figure 2 As shown, after the staff disassembles the second shell 312 and the second housing 320 , the shell opening and the first opening 313 are both in an open state, and the staff can inspect the control board 100 or the transformer assembly 200 through the shell opening and the first opening 313 .

[0055] On the basis that the second shell portion 312 is connected to the first shell portion 311 and can be separated from the first shell portion 311, the transformer assembly 200 and the control board 100 are both connected to the first shell portion 311, and the second shell portion 312 has a signal hole 340. Because the second shell portion 312 has the signal hole 340, during the assembly process of the three-phase current transformer 10, one end of the signal line can pass through the second shell portion 312 through the signal hole 340, enter the installation cavity 330, and connect to the transformer assembly 200, without affecting the installation of the transformer assembly 200 and the control board 100 in the first shell portion 311. In addition, the connection between the transformer assembly 200 and the first shell portion 311 and the connection between the control board 100 and the first shell portion 311 will not affect the signal line passing through the signal hole 340, making it easier to connect the signal line to the transformer assembly 200. On the other hand, arranging the signal hole 340 on the second shell 312 can reduce the impact of the signal hole 340 on the structural strength of the first shell 311 , thereby enabling the transformer assembly 200 and the control board 100 to be more stably installed on the first shell 310 .

[0056] It should be noted that, as mentioned above, the transformer assembly 200 and the control board 100 can be directly or indirectly connected to the first housing 310 , the transformer assembly 200 and the control board 100 can also be directly or indirectly connected to the first shell 311 .

[0057] For further information, please refer to Figure 2 、 Figure 3 、 Figure 4 As shown, in some embodiments, the first shell 311 includes a first connecting plate 3111, a second connecting plate 3112, a third connecting plate 3113, and a fourth connecting plate 3114, and the second shell 312 and the second housing 320 are plate-shaped structures. Since the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312, and the second housing 320 are all plate-shaped structures, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312, and the second housing 320 can be directly processed and formed on the plate.

[0058] The direction from the second housing 320 to the fourth connecting plate 3114 (i.e. Figure 2 、 Figure 3), one end of the first connecting plate 3111 is connected to the second shell 320, the other end of the first connecting plate 3111 is connected to the fourth connecting plate 3114, one end of the second connecting plate 3112 is connected to the second shell 320, the other end of the second connecting plate 3112 is connected to the fourth connecting plate 3114, one end of the third connecting plate 3113 is connected to the second shell 320, the other end of the third connecting plate 3113 is connected to the fourth connecting plate 3114, one end of the second shell 312 is connected to the second shell 320, the other end of the second shell 312 is connected to the fourth connecting plate 3114, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113 and the second shell 312 surround the second shell 320 and the fourth connecting plate 3114, and are connected end to end in a clockwise direction. The first connecting plate 3111 , the second connecting plate 3112 , the third connecting plate 3113 , the fourth connecting plate 3114 , the second shell portion 312 and the second housing 320 together define a mounting cavity 330 .

[0059] The aforementioned connection relationship enables the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell portion 312, and the second shell 320 to be combined to form a polyhedron having a mounting cavity 330, and the control board 100 and the transformer assembly 200 can be accommodated within the mounting cavity 330 of the polyhedron. Furthermore, because the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell portion 312, and the second shell 320 can all be directly machined and formed from sheet materials, the material cost of the housing 300 of the present invention is lower.

[0060] It should be noted that the polyhedron formed by the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312 and the second shell 320 in the above embodiment can be a geometric body such as a prism, a cuboid or a cube. As a preferred embodiment, please refer to Figure 1-4 As shown, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312 and the second shell 320 are enclosed into a rectangular parallelepiped, and the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312 and the second shell 320 are all rectangular plates, which is beneficial to improve the utilization rate of plate cutting and further reduce the material cost of the outer shell 300.

[0061] The above description describes the specific solution and corresponding technical effects of the present invention in which the second housing 320 can be separated from the first housing 310 to expose the control board 100. Without departing from the inventive concept of the present invention, those skilled in the art may adjust the position of the control board 100 within the mounting cavity 330 according to actual needs.

[0062] In some embodiments, the first housing 310 has a first opening 313 that communicates with the mounting cavity 330. The second housing 320 covers the first opening 313 and is connected to the first housing 310. The control board 100 is located on a side of the mounting cavity 330 away from the second housing 320. Because the control board 100 is located on a side of the mounting cavity 330 away from the second housing 320, it is positioned away from the first opening 313. If the second housing 320 accidentally separates from the first housing 310, causing the first opening 313 to open, dust, debris, and other impurities that enter the mounting cavity 330 through the first opening 313 are less likely to land on the control board 100. This ensures the cleanliness of the control board 100, reduces external interference with the electrical performance of the control board 100, and enhances the operating stability of the three-phase current transformer 10.

[0063] As a preferred embodiment, please refer to Figure 2 As shown, the first housing 310 has a first opening 313 that communicates with the mounting cavity 330. The second housing 320 covers the first opening 313 and is connected to the first housing 310. The control board 100 is located within the mounting cavity 330 on the side of the second housing 320. Because the control board 100 is located on the side of the mounting cavity near the second housing 320, it is closer to the first opening 313. When maintenance is required, the control board 100 is less likely to be obstructed by the housing 300, allowing workers to more easily visually see the control board 100 through the first opening 313, thereby more clearly identifying the status of the control board 100 and obtaining more accurate maintenance results. The closer proximity of the control board 100 to the first opening 313 also reduces the depth of tool access within the accommodating cavity, making it easier for workers to use tools to handle the control board 100. Furthermore, the closer proximity of the control board 100 to the first opening 313 facilitates replacement.

[0064] It should be noted that the present invention does not limit the shape of the edge of the first opening 313. Figure 2-4As shown, the three-phase current transformer 10 of the present invention has been described above as having a first opening 313. In the above embodiment, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, and the second shell 312 collectively define the first opening 313. The different edges of the first opening 313 enclose a rectangle perpendicular to the orientation of the first opening 313, and the orientation of the first opening 313 is parallel to the left-right direction. In other embodiments, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, and the second shell 312 collectively define the first opening 313. The different edges of the first opening 313 enclose a trapezoid perpendicular to the orientation of the first opening 313.

[0065] When inspecting the control board 100, workers can choose any viewing angle, thereby performing maintenance on the control board 100 of the present invention. Since the projected area enclosed by the edges of the first opening 313 is the largest when viewed along the first opening 313, workers can more easily insert tools into the mounting cavity 330 along the direction of the first opening 313, facilitating maintenance of components placed in the mounting cavity 330.

[0066] Based on the above invention concept, please refer to Figure 3 As shown, in some embodiments, on a projection plane perpendicular to the orientation of first opening 313, the area enclosed by the edge of first opening 313 has a first projection on the projection plane, and control board 100 has a second projection on the projection plane, with the first projection and the second projection overlapping. Because the first and second projections overlap, a worker can observe control board 100 when viewing along the direction of first opening 313, thereby enabling maintenance of control board 100.

[0067] As mentioned above, the control board 100 of the present invention includes a substrate 110 and an electronic component 120, and the electronic component 120 is connected to the substrate 110. Figure 2 As shown, in some embodiments, the electronic component 120 is connected to the side of the substrate 110 close to the second housing 320 along the direction of the first opening 313. Since the electronic component 120 is connected to the side of the substrate 110 close to the second housing 320, a worker can observe the electronic component 120 on the control board 100 along the direction of the first opening 313, thereby being able to inspect and repair the electronic component 120.

[0068] In some embodiments, along the direction of the first opening 313, when electronic components 120 are connected to both sides of the substrate 110, those skilled in the art may selectively set one side of the substrate 110 with the electronic components 120 close to the second shell 320 based on the number of electronic components 120 on both sides of the substrate 110, the replacement frequency, etc., to facilitate the staff to maintain the control board 100 later.

[0069] The specific solution and corresponding technical effects of the present invention, in which the second housing 320 can be separated from the first housing 310 to expose the control board 100, have been described above. Without departing from the inventive concept of the present invention, those skilled in the art may adjust the relative position of the transformer assembly 200 and the control board 100 within the mounting cavity 330 according to actual needs.

[0070] In some embodiments, the transformer assembly 200 is located on a side of the control board 100 near the second housing 320. Relative to the control board 100, the transformer assembly 200 is closer to the first opening 313. When the second housing 320 accidentally separates from the first housing 310 and the first opening 313 is opened, the transformer assembly 200 can block dust, debris, and other impurities from entering the mounting cavity 330 through the first opening 313. Dust, debris, and the like that enter the mounting cavity 330 through the first opening 313 are less likely to land on the transformer assembly 200, thereby ensuring the cleanliness of the control board 100 and reducing external interference with the electrical performance of the control board 100. This improves the operating stability of the three-phase current transformer 10.

[0071] As a preferred embodiment, please refer to Figure 2 As shown, the transformer assembly 200 is located on the side of the control panel 100 away from the second shell 320. Compared with the transformer assembly 200, the control panel 100 is closer to the first opening 313. When maintenance is required, the transformer assembly 200 will not block the control panel 100, and the staff can more easily visually see the control panel 100 through the first opening 313, so that the status of the control panel 100 can be more clearly identified and a more accurate maintenance result can be obtained. When using tools to operate the control panel 100, the transformer assembly 200 will not hinder the movement of the tools, making it more convenient for the staff to use tools to handle the control panel 100. In addition, the fact that the control panel 100 is closer to the first opening 313 than the control panel 100 also enables the staff to dismantle or install the control panel 100 without having to remove the transformer assembly 200 first, which is beneficial to improving the replacement efficiency of the control panel 100.

[0072] Based on the above solution, please refer to Figure 2As shown, on a projection plane perpendicular to the first opening 313, the control board 100 has a first projection on the projection plane, and the transformer assembly 200 has a second projection on the projection plane, with the first projection overlapping the second projection. Because the first projection and the second projection overlap, the transformer assembly 200 and the control board 100 occupy less space perpendicular to the first opening 313. This further reduces the space of the mounting cavity 330 for accommodating the transformer assembly 200 and the control board 100 perpendicular to the first opening 313, facilitating a reduction in the size of the housing 300 defining the mounting cavity 330 perpendicular to the first opening 313.

[0073] Furthermore, in some embodiments, the housing 300 further includes an isolator. The isolator is connected to the first housing 310 and is positioned between the control board 100 and the transformer assembly 200. The isolator connected to the first housing 310 can separate the control board 100 and the transformer assembly 200, preventing collision between the control board 100 and the transformer, thereby further preventing a short circuit between the control board 100 and the transformer, which could affect the normal operation of the three-phase current transformer 10.

[0074] On the other hand, the isolating member can also cooperate with the housing 300 to further reduce the movable space of the transformer assembly 200 in the direction of the first opening 313, and reduce the movement of the transformer assembly 200 in the direction of the first opening 313. For example, some embodiments have been described above in which the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312 and the second shell 320 are enclosed to form a polyhedron; on the basis of the above scheme, since the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113 and the second shell 312 surround the fourth connecting plate 3114 and the second shell 320, and are connected end to end in a clockwise direction, the first connecting plate 3111, the second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114, the second shell 312 and the second shell 320 are enclosed to form a polyhedron. The second connecting plate 3112, the third connecting plate 3113, the fourth connecting plate 3114 and the second shell 312 can define a first opening 313; along the direction of the first opening 313, under the premise that the activity space of the transformer assembly 200 is already restricted by the fourth connecting plate 3114 and the second shell 320, the isolation piece arranged between the fourth connecting plate 3114 and the second shell 320 can further reduce the activity space of the transformer assembly 200 and reduce the movement of the transformer assembly 200 along the direction of the first opening 313.

[0075] Without departing from the inventive concept of the present invention, those skilled in the art can design the shape of the isolation member on their own.

[0076] As a preferred option, please refer to Figure 2 、 Figure 3As shown, in some embodiments, the housing 300 further includes an isolation plate 350, which is a plate-shaped isolation member connected to the first housing 310. The isolation plate 350 is positioned between the control board 100 and the transformer assembly 200. The isolation plate 350 separates the control board 100 and the transformer assembly 200 along the direction of the first opening 313, preventing the control board 100 and the transformer assembly 200 from colliding with each other, thereby further preventing a short circuit between the control board 100 and the transformer assembly 200, which could affect the normal operation of the three-phase current transformer 10. Furthermore, the isolation plate 350 can be directly machined from a sheet material, resulting in lower material costs.

[0077] For further information, please refer to Figure 3 As shown, in some embodiments, the isolation member includes an isolation body 351 and a support portion 352. The isolation body 351 is connected to the support portion 352. The support portion 352 protrudes relative to the isolation body 351 toward the second housing 320. The support portion 352 is closer to the second housing 320 than the control board 100. Because the support portion 352 is closer to the second housing 320 than the control board 100, when the second housing 320 needs to be installed to close the first opening 313, the second housing 320 is first blocked by the support portion 352 as it approaches the control board 100, thereby preventing the second housing 320 from contacting and damaging the control board 100.

[0078] Without departing from the inventive concept of the present invention, those skilled in the art may freely select the connection form between the isolation body 351 and the support portion 352. For example, the support portion 352 may be welded, bonded, or screwed to the isolation body 351.

[0079] As a preferred embodiment, the housing 300 includes an isolation plate 350, which includes an isolation body 351. A portion of the isolation plate 350 is bent relative to the isolation body 351 to form a support portion 352 of the isolation plate 350. Compared with other embodiments in which the support portion 352 is formed, the above embodiment has a lower processing cost for forming the support portion 352.

[0080] Please refer to Figure 2 、 Figure 3 As shown, in some embodiments, the first housing 310 has a first opening 313, and the second housing 320 covers the first opening 313 and is connected to the first housing 310. The first opening 313 is connected to the mounting cavity 330. The isolation plate 350 has a second opening 353. The control board 100 is arranged in a direction away from the second opening 353 along the direction of the first opening 313. It should be noted that the phrase "the control board 100 is arranged in a direction away from the second opening 353 along the direction of the first opening 313" mentioned in the present invention means that the control board 100 does not block the second opening 353 when facing the first opening 313.

[0081] On a projection plane perpendicular to the orientation of first opening 313, the area enclosed by the edge of first opening 313 has a first projection on the projection plane, the area enclosed by the second opening 353 has a third projection on the projection plane, and transformer assembly 200 has a fourth projection on the projection plane, and the first, third, and fourth projections overlap. It should be understood that the overlapping of the first, third, and fourth projections refers to the presence of an area on the projection plane that simultaneously overlaps with the first, third, and fourth projections. Because the first, third, and fourth projections overlap, and the projection plane is perpendicular to the orientation of first opening 313, a worker can observe transformer assembly 200 through first opening 313 and second opening 353 when observing along the orientation of first opening 313, facilitating maintenance of transformer assembly 200 through first opening 313 and second opening 353.

[0082] Based on the above solution, on a projection plane perpendicular to the orientation of first opening 313, the area enclosed by the edge of first opening 313 has a first projection on the projection plane, and control board 100 has a second projection on the projection plane, with the first projection and the second projection overlapping. Because the first and second projections overlap, and the first, third, and fourth projections overlap, a worker can simultaneously observe control board 100 and transformer assembly 200 when observing along the direction of first opening 313, thereby enabling simultaneous maintenance of control board 100 and transformer assembly 200.

[0083] Without departing from the inventive concept of the present invention, those skilled in the art may select a method for forming the second opening 353 of the isolating member. For example, those skilled in the art may directly remove a portion of the isolating member by machining to form the second opening 353 of the isolating member.

[0084] As a preferred embodiment, housing 300 includes an isolation plate 350, which includes an isolation body 351. A portion of isolation plate 350 is bent relative to isolation body 351 to form a support portion 352 for isolation plate 350, thereby forming a second opening 353. Compared to other embodiments in which second opening 353 is formed, this embodiment not only forms second opening 353 but also forms support portion 352 for protecting control board 100, as described above.

[0085] In some embodiments, the housing 300 further includes a mounting portion 370 , and the three-phase current transformer 10 is mounted on the support plane through the mounting portion 370 of the housing 300 , thereby achieving fixation of the three-phase current transformer 10 .

[0086] For further information, please refer to Figure 1 、 Figure 2As shown, in some embodiments, the housing 300 further includes a mounting portion 370, which is connected to the first housing 310. When the second housing 320 is separated from the first housing 310, the first housing 310 is still fixed to the support plane by the mounting portion 370, so that the control board 100 and the transformer assembly 200 connected to the first housing 310 are also kept fixed, and the control board 100 is in a stable state, which facilitates the maintenance of the control board 100 by the staff.

[0087] Without departing from the inventive concept of the present invention, the mounting portion 370 may be a commonly used fastener, such as a bolt, a pin, etc.

[0088] In some embodiments, please refer to Figure 2 As shown, the mounting portion 370 includes a main body and a flange. The main body is connected to the first shell 310 . The flange is connected to the main body and bent relative to the main body, and is used for mounting on the bracket plane.

[0089] The embodiment described above includes a first housing 310 comprising a first housing portion 311 and a second housing portion 312. Based on this solution, the first housing portion 311 is secured to the support plane via the mounting portion 370. After the second housing portion 312 is separated from the first housing portion 311, the first housing portion 311 remains secured to the support plane via the mounting portion 370. This ensures that the control board 100 and transformer assembly 200 connected to the first housing portion 311 remain fixed, maintaining a stable state for easy maintenance.

[0090] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. Three-phase current transformer, characterized in that, include: Control panel; a transformer assembly, electrically connected to the control board; The housing comprises a first shell and a second shell, wherein the second shell is connected to the first shell; The first shell and the second shell jointly define an installation cavity, the transformer assembly and the control board are both accommodated in the installation cavity and are both connected to the first shell; the first shell has a signal hole for allowing the signal line to pass through; the second shell can be separated from the first shell to expose the control board.

2. The three-phase current transformer according to claim 1, characterized in that: The first shell includes a first shell portion and a second shell portion; the second shell portion is connected to the first shell portion and can be separated from the first shell portion; the transformer assembly and the control board are both connected to the first shell portion, and the second shell portion has the signal hole.

3. The three-phase current transformer according to claim 2, characterized in that: The first shell portion includes a first connecting plate, a second connecting plate, a third connecting plate and a fourth connecting plate; the second shell portion and the second shell are plate-shaped structures; the second shell and the fourth connecting plate are arranged opposite to each other; In the direction from the second shell to the fourth connecting plate, one end of the first connecting plate is connected to the second shell, the other end of the first connecting plate is connected to the fourth connecting plate, one end of the second connecting plate is connected to the second shell, the other end of the second connecting plate is close to the fourth connecting plate, one end of the third connecting plate is connected to the second shell, the other end of the third connecting plate is connected to the fourth connecting plate, one end of the second shell portion is connected to the second shell, the other end of the second shell portion is connected to the fourth connecting plate, the first connecting plate, the second connecting plate, the third connecting plate and the second shell portion surround the second shell and the fourth connecting plate, and are connected end to end in a clockwise direction; The first connecting plate, the second connecting plate, the third connecting plate, the fourth connecting plate, the second shell portion and the second housing together define the installation cavity.

4. The three-phase current transformer according to claim 1, characterized in that: The first shell has a first opening, which is communicated with the installation cavity. The second shell covers the first opening and is connected to the first shell. The control board is located on a side of the installation cavity close to the second shell.

5. The three-phase current transformer according to claim 4, characterized in that: On a projection plane perpendicular to the direction of the first opening, the area enclosed by the edge of the first opening has a first projection on the projection plane, the control board has a second projection on the projection plane, and the first projection overlaps with the second projection.

6. The three-phase current transformer according to claim 4, characterized in that: The control board includes a substrate and an electronic component; along the direction of the first opening, the electronic component is connected to a side of the substrate close to the second shell.

7. The three-phase current transformer according to claim 1, characterized in that: The transformer assembly is located on a side of the control board facing away from the second housing.

8. The three-phase current transformer according to claim 7, characterized in that: The housing further includes an isolation plate connected to the first shell; the isolation plate is located between the control board and the transformer assembly.

9. The three-phase current transformer according to claim 8, characterized in that: The isolation plate includes an isolation body and a support portion, wherein the isolation body is connected to the support portion; the support portion protrudes toward the second shell relative to the isolation body, and the support portion is closer to the second shell than the control board.

10. The three-phase current transformer according to claim 8, characterized in that: The first shell has a first opening, the second shell covers the first opening and is connected to the first shell, the first opening is connected to the installation cavity; the isolation plate has a second opening; Along the direction of the first opening, the control panel is arranged to avoid the second opening; On a projection plane perpendicular to the direction of the first opening, the area enclosed by the edge of the first opening has a first projection on the projection plane, the area enclosed by the edge of the second opening has a second projection on the projection plane, and the transformer assembly has a third projection on the projection plane, and the first projection, the second projection and the third projection overlap.

11. The three-phase current transformer according to claim 1, characterized in that: The housing further includes a mounting portion, which is connected to the first shell and is used for mounting on a support plane.

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