Current transformer and electric energy meter

Abstract

The utility model relates to a current transformer and an electric energy meter. The current transformer comprises a conducting bar, an insulating shell and an electromagnet, the insulating shell comprises a bottom plate and a cylinder, the bottom plate is provided with a first through hole and a first notch, and the first notch penetrates through the edge of the bottom plate and the hole wall of the first through hole. The barrel is provided with a first end, a second end and a second through hole penetrating through the first end and the second end, the first end is connected to the bottom plate, the first through hole is communicated with the second through hole, the conducting bar penetrates through the first through hole and the second through hole, a second notch is formed in the side wall of the barrel, and the second notch penetrates through the first end and the second end; the second gap is communicated with the first gap and the second through hole, and the first gap and the second gap are used for allowing the conducting bar to pass through so as to enter the first through hole and the second through hole. The insulating shell is provided with the first gap and the second gap, so that the insulating shell and the conducting bar are convenient to assemble, and the assembling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic instrument, in particular to a current transformer and an electric energy meter. BACKGROUND

[0002] The electric energy meter is a kind of instrument equipment, which can collect user power voltage and current in real time, process and convert the sampled voltage and current signals into pulse output proportional to electric energy by using special electric energy meter integrated circuit, and then display electric energy through a counter or a digital display.

[0003] The common electric energy meter adopts a current transformer to sense current. The current transformer includes an electromagnet, an insulating shell and a conductive bar. During assembly, the insulating shell is sleeved on the conductive bar from one end of the conductive bar, the insulating shell is moved along the conductive bar to a specified position, and then the electromagnet is sleeved on the insulating shell. However, the above assembly method is complicated and has low assembly efficiency. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a current transformer and an electric energy meter to improve the assembly efficiency.

[0005] In a first aspect, the present application provides a current transformer, comprising:

[0006] a conductive bar;

[0007] an insulating shell, the insulating shell comprising a bottom plate and a cylinder, the bottom plate being provided with a first through hole and a first notch, the first notch penetrating an edge of the bottom plate and a hole wall of the first through hole; the cylinder having a first end, a second end and a second through hole penetrating the first end and the second end, the first end being connected to the bottom plate, the first through hole being in communication with the second through hole, the conductive bar being arranged in the first through hole and the second through hole, a side wall of the cylinder being provided with a second notch, the second notch penetrating the first end and the second end, the second notch being in communication with the first notch and the second through hole, the first notch and the second notch being used for the conductive bar to pass through to enter the first through hole and the second through hole; and

[0008] an electromagnet, the electromagnet being sleeved outside the cylinder.

[0009] In one of the embodiments, the current transformer further comprises an insulating cover, the insulating cover being arranged on a side of the electromagnet away from the bottom plate, the insulating cover and the bottom plate being matched to limit the axial movement of the electromagnet along the cylinder.

[0010] In one of the embodiments, the insulating cover is provided with a third through hole, and the insulating cover is sleeved on the second end through the third through hole.

[0011] In one of the embodiments, the insulating shell is provided with a first clamping part, and the conductive row is provided with a second clamping part, the first clamping part and the second clamping part are clamped and matched.

[0012] In one of the embodiments, one of the first clamping part and the second clamping part is provided with a dovetail groove, and the other one of the first clamping part and the second clamping part is provided with a dovetail wedge, the dovetail wedge is arranged in the dovetail groove.

[0013] In one of the embodiments, the conductive row includes a main body part, a zero line input end and a zero line output end, the zero line input end is arranged at one end of the main body part, and the zero line output end is arranged at the other end of the main body part.

[0014] In one of the embodiments, the main body part includes a first flat section, a second flat section and a third flat section, the first flat section and the second flat section are arranged opposite to and spaced from each other, the third flat section is arranged between the first flat section and the second flat section, one end of the third flat section is connected with the first flat section, the other end of the third flat section is connected with the second flat section, one end of the first flat section away from the third flat section is connected with the zero line input end, one end of the second flat section away from the third flat section is connected with the zero line output end, the third flat section is arranged in the first through hole and the second through hole through the first gap and the second gap, and the first flat section and the second flat section are respectively arranged at two ends of the axial direction of the insulating shell.

[0015] In one of the embodiments, the widths of the first gap and the second gap are greater than or equal to the thickness of the third flat section, and the widths of the first gap and the second gap are less than the width of the third flat section.

[0016] In one of the embodiments, the current transformer further includes a shell, the shell is provided with a receiving cavity and an opening communicating with the receiving cavity, the insulating shell, the electromagnet and the main body part are arranged in the receiving cavity, and the zero line input end and the zero line output end are arranged outside the receiving cavity through the opening.

[0017] In one of the embodiments, the shell has a bottom, the bottom is arranged opposite to the opening, the bottom is provided with a first through hole and a positioning cylinder, the positioning cylinder extends along the depth direction of the receiving cavity, the positioning cylinder is provided with a second through hole penetrating through both ends of the length direction of the positioning cylinder, the first through hole and the second through hole communicate with each other, and the first through hole and the second through hole are used for allowing a live line input end of a magnetic holding relay to pass through; the positioning cylinder is provided with a positioning protrusion, and the positioning protrusion is positioned and matched with the second gap.

[0018] In one embodiment, the current transformer further includes a filler body disposed within the receiving cavity. The filler body is used to fix the insulating shell, the electromagnet, and the conductive bar. The side of the filler body facing the opening covers the surfaces of the insulating shell, the electromagnet, and the main body to seal the insulating shell, the electromagnet, and the main body within the receiving cavity.

[0019] In one embodiment, the housing has a sidewall, the sidewall being provided with a first insertion slot, the groove wall of the first insertion slot being provided with a first through outlet; the neutral output terminal is connected to a power supply pin, the end of the power supply pin opposite to the neutral output terminal passing through the first through outlet to the outside of the receiving cavity.

[0020] In one embodiment, the sidewall is further provided with a second insertion slot, and the groove wall of the second insertion slot is provided with a second through outlet; the electromagnet includes an annular magnetic core and a coil, the coil is wound on the annular magnetic core, the end of the coil is connected to a signal pin, the signal pin is provided with a fixing seat, the fixing seat is provided in the second insertion slot, and the end of the signal pin away from the coil passes through the second through outlet to the outside of the receiving cavity.

[0021] Secondly, this application also provides an electricity meter, including the current transformer of any of the above embodiments.

[0022] During assembly of the aforementioned current transformer and energy meter, the conductive busbar is aligned with the first and second notches, and then pushed towards the insulating shell. The conductive busbar passes through the first and second notches and enters the first and second through holes. Then, an electromagnet is fitted onto one end of the conductive busbar, and the electromagnet is moved onto the cylinder along the extension direction of the conductive busbar. By providing the first and second notches on the insulating shell, the assembly of the insulating shell and the conductive busbar is facilitated, improving assembly efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a current transformer according to an embodiment of this application.

[0024] Figure 2 for Figure 1 The diagram shows a partial structural schematic of a current transformer.

[0025] Figure 3 for Figure 2 The diagram shown is an exploded view of the circuit transformer.

[0026] Figure 4 for Figure 2 The diagram shown is a partial exploded view of the current transformer from another perspective.

[0027] Figure 5 This is a schematic diagram of the structure of the insulating shell, electromagnet, conductive busbar and end cap assembled according to an embodiment of this application.

[0028] Figure 6 for Figure 5 The diagram shows the assembly structure of the insulating shell, electromagnet, conductive busbar and end cap from another perspective.

[0029] Figure 7 for Figure 6 Left view of the assembly structure of the insulating shell, electromagnet, conductive busbar and end cap shown.

[0030] Figure 8 This is a schematic diagram of the structure of the insulating shell and the conductive busbar after assembly according to an embodiment of this application.

[0031] Figure 9 This is a process diagram of assembling the end cap and insulating shell according to an embodiment of this application.

[0032] Explanation of icon numbers:

[0033] 10. Insulating shell; 11. Base plate; 111. First through hole; 112. First notch; 113. Dovetail wedge; 12. Cylinder; 121. Second through hole; 122. Second notch; 123. First end; 124. Second end; 20. Electromagnet; 21. Coil; 30. Conductor busbar; 31. Main body; 311. First flat section; 312. Second flat section; 3121. Dovetail groove; 313. Third flat section; 32. Neutral wire input terminal; 3 3. Neutral output terminal; 40. Insulating cover; 41. Third through hole; 50. Outer shell; 51. Receiving cavity; 52. Opening; 53. Bottom; 532. Positioning cylinder; 5321. Second through hole; 5322. Positioning protrusion; 54. Side wall; 541. First insertion slot; 5411. First through outlet; 542. Second insertion slot; 5421. Second through outlet; 60. Filler; 70. Power supply pin; 80. Signal pin; 81. Fixing base. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] See Figure 2 and Figure 3An embodiment of this application provides a current transformer including an insulating shell 10, an electromagnet 20, and a conductor bar 30.

[0036] In one embodiment, see Figure 3 The insulating shell 10 includes a base plate 11 and a cylindrical body 12 connected to the base plate 11. The electromagnet 20 has a ring structure and is sleeved on the cylindrical body 12. The conductive bar 30 passes through the base plate 11 and the cylindrical body 12. In this way, the insulating shell 10 can support and protect the electromagnet 20, and at the same time, the insulating shell 10 plays an insulating role between the electromagnet 20 and the conductive bar 30, effectively improving the insulation effect.

[0037] See Figure 8 The base plate 11 has a first through hole 111 in the middle, which penetrates the two opposite surfaces of the base plate 11. A first notch 112 is provided between the edge of the base plate 11 and the first through hole 111, which penetrates the edge of the base plate 11 and the wall of the first through hole 111 so that the first notch 112 communicates with the first through hole 111.

[0038] See Figure 8 The cylindrical body 12 has a first end 123, a second end 124, and a second through hole 121 passing through the first end 123 and the second end 124. The first end 123 is connected to the bottom plate 11, and the first through hole 121 communicates with the second through hole 121. The conductive busbar 30 passes through the first through hole 121 and the second through hole 121. The side wall 54 of the cylindrical body 12 is provided with a second notch 122, which extends along the direction from the first end 123 to the second end 124 and passes through the first end 123 and the second end 124. The second notch 122 communicates with the first notch 112 and the second through hole 121. The first notch 112 and the second notch 122 are used for the conductive busbar 30 to pass through and enter the first through hole 111 and the second through hole 121.

[0039] During assembly, the conductive busbar 30 is aligned with the first notch 112 and the second notch 122, and then pushed towards the insulating shell 10. The conductive busbar 30 passes through the first notch 112 and the second notch 122 and enters the first through hole 111 and the second through hole 121. Then, the electromagnet 20 is fitted onto one end of the conductive busbar 30, and moved onto the cylinder 12 along the extending direction of the conductive busbar 30. The first notch 112 and the second notch 122 on the insulating shell 10 facilitate the assembly of the insulating shell 10 and the conductive busbar 30.

[0040] In this embodiment, see Figure 8 The base plate 11 and the cylinder 12 are integrally formed, and the cylinder 12 extends from the wall of the first through hole 111 in a direction away from the base plate 11. Of course, in other embodiments, the base plate 11 can also be detachably connected to the cylinder 12.

[0041] In this embodiment, the first through hole 111 and the second through hole 121 are circular holes. Of course, in other embodiments, the first through hole 111 and the second through hole 121 may also be elliptical holes or square holes, etc., and are not limited thereto.

[0042] In one embodiment, see Figure 8 The busbar 30 includes a main body 31, a neutral input terminal 32, and a neutral output terminal 33.

[0043] Further, see Figure 8 The main body 31 includes a first flat segment 311, a second flat segment 312, and a third flat segment 313. The first flat segment 311 and the second flat segment 312 are opposite to each other and spaced apart. Optionally, the first flat segment 311 and the second flat segment 312 are parallel. The third flat segment 313 is located between the first flat segment 311 and the second flat segment 312. One end of the third flat segment 313 is connected to the first flat segment 311, and the other end of the third flat segment 313 is connected to the second flat segment 312. The end of the first flat segment 311 facing away from the third flat segment 313 is connected to the neutral wire input terminal 32, and the end of the second flat segment 312 facing away from the third flat segment 313 is connected to the neutral wire output terminal 33.

[0044] Specifically, see Figure 8 The third flat segment 313 is provided in the first through hole 111 and the second through hole 121 through the first notch 112 and the second notch 122. The first flat segment 311 and the second flat segment 312 are respectively located at both ends of the insulating shell 10 along its axial direction.

[0045] In one embodiment, see Figure 8 The widths of the first notch 112 and the second notch 122 are both greater than or equal to the thickness of the third flat segment 313. For ease of understanding, W1 represents the width of the first notch 112 and W2 represents the width of the second notch 122. Thus, the third flat segment 313 can pass through the first notch 112 and the second notch 122 and enter the first through hole 111 and the second through hole 121.

[0046] Further, see Figure 8 The widths of the first notch 112 and the second notch 122 are smaller than the width of the third flat segment 313. For ease of understanding, W3 is used to represent the width of the third flat segment 313. This prevents the insulating shell 10 from easily separating from the conductive busbar 30.

[0047] In one embodiment, see Figure 6 , Figure 7 and Figure 8The current transformer also includes an insulating cover 40, which is located at the second end 124 of the cylinder 12. Thus, the insulating cover 40 serves as an insulating barrier between the electromagnet 20 and the conductor bar 30, effectively improving the insulation performance.

[0048] Further, see Figure 6 and Figure 9 The insulating cover 40 is provided with a third through hole 41, through which it is sleeved onto the second end 124 of the cylinder 12. Optionally, the insulating cover 40 and the second end 124 of the cylinder 12 are engaged. During assembly, the insulating cover 40 is sleeved onto the conductive busbar 30 from the neutral wire input end 32, and then the insulating cover 40 is moved along the extension direction of the conductive busbar 30 until it is sleeved onto the second end 124 of the cylinder 12. This facilitates the assembly of the insulating shell 10 and the insulating cover 40, improving assembly efficiency.

[0049] In one embodiment, see Figure 2 and Figure 3 The current transformer also includes a housing 50. The housing 50 has a receiving cavity 51, within which the insulating shell 10, electromagnet 20, and main body 31 are housed. The neutral input terminal 32 and neutral output terminal 33 are located outside the receiving cavity 51. It should be noted that the housing 50 is made of insulating material, thus providing insulation and improving insulation performance. Simultaneously, the housing 50 protects the insulating shell 10, electromagnet 20, and main body 31, effectively extending the service life of the current transformer. Furthermore, since the neutral input terminal 32 and neutral output terminal 33 are located outside the receiving cavity 51, it facilitates electrical connection between the neutral input terminal 32 and neutral output terminal 33 and other electrical components.

[0050] Further, see Figure 3 The outer casing 50 is also provided with an opening 52, which communicates with the receiving cavity 51. During assembly, the insulating shell 10, the electromagnet 20 and the main body 31 are placed into the receiving cavity 51 through the opening 52.

[0051] In one embodiment, see Figure 2 , Figure 3 and Figure 4 The outer casing 50 has a bottom 53, which is disposed opposite to the opening 52. The bottom 53 is provided with a first through hole and a positioning cylinder 532. The positioning cylinder 532 extends from the bottom 53 toward the opening 52. The positioning cylinder 532 is provided with a second through hole 5321, which passes through both ends of the positioning cylinder 532 along the axial direction of the positioning cylinder 532. The first through hole and the second through hole 5321 are connected. The first through hole and the second through hole 5321 are used for the live wire input terminal of the magnetic latching relay to pass through.

[0052] Further, see Figure 2 andFigure 5 The insulating shell 10 is fitted onto the positioning cylinder 532. The positioning cylinder 532 is provided with a positioning protrusion 5322, which engages with the second notch 122. In this way, the insulating shell 10 can be positioned on the outer shell 50, and it also serves to prevent mistaken identity.

[0053] In one embodiment, see Figure 1 The current transformer also includes a filler 60. The filler 60 is disposed within the receiving cavity 51 and is used to fix the insulating shell 10, electromagnet 20, and conductive bus 30. The side of the filler 60 facing the opening 52 covers the surfaces of the insulating shell 10, electromagnet 20, and main body 31, sealing them within the receiving cavity 51. During assembly, after placing the insulating shell 10, electromagnet 20, and main body 31 into the receiving cavity 51, adhesive is poured into the cavity. After the adhesive cures, an adhesive-filled surface is formed on the side of the main body 31 of the insulating shell 10, electromagnet 20, and conductive bus 30 facing the opening 52, sealing them within the receiving cavity 51. This eliminates the need for a sealing cap at the opening 52.

[0054] In one embodiment, see Figure 1 The filling body 60 is provided with a third through hole, a fourth through hole, and a fifth through hole. All three through holes extend along the depth direction of the receiving cavity 51 and penetrate the filling body 60. The fifth through hole is located between the third and fourth through holes. A positioning cylinder 532 is disposed within the third through hole. The neutral wire input terminal 32 is disposed within the fourth through hole, meaning it extends through the fourth through hole to the outside of the receiving cavity 51. The neutral wire output terminal 33 is disposed within the fifth through hole, meaning it extends through the fifth through hole to the outside of the receiving cavity 51.

[0055] In one embodiment, see Figure 5 The insulating shell 10 is provided with a first snap-fit ​​portion, and the conductive bus 30 is provided with a second snap-fit ​​portion. The first snap-fit ​​portion and the second snap-fit ​​portion engage with each other. During assembly, after the insulating shell 10 is placed on the conductive bus 30, the first snap-fit ​​portion and the second snap-fit ​​portion are engaged to fix the insulating shell 10 on the conductive bus 30. In this way, during the process of placing the insulating shell 10, the electromagnet 20 and the conductive bus 30 into the outer shell 50, the insulating shell 10 and the electromagnet 20 can be prevented from shaking on the conductive bus 30, ensuring that the insulating shell 10, the electromagnet 20 and the conductive bus 30 can be quickly assembled into the receiving cavity 51.

[0056] Optionally, one of the first and second latching portions is provided with a dovetail groove 3121, and the other of the first and second latching portions is provided with a dovetail wedge 113, which is disposed within the dovetail groove 3121. This improves the stability and firmness of the connection between the insulating shell 10 and the conductive busbar 30.

[0057] In this embodiment, see Figure 5 The second flat section 312 is provided with a dovetail groove 3121 at one end near the third flat section 313, and the dovetail groove 3121 extends along the length of the second flat section 312. The bottom plate 11 is provided with a dovetail wedge 113 on the side away from the cylinder 12, and the dovetail wedge 113 is located in the dovetail groove 3121.

[0058] Optionally, one of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​hole, and the other of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​post, with the snap-fit ​​post disposed inside the snap-fit ​​hole.

[0059] In one embodiment, see Figure 2 and Figure 3 The outer casing 50 has a side wall 54, which is connected to the bottom 53 and forms a receiving cavity 51. The side wall 54 is provided with a first insertion groove 541, and the groove wall of the first insertion groove 541 is provided with a first through outlet 5411.

[0060] Specifically, see Figure 3 One end of the first insertion slot 541 is located inside the receiving cavity 51, and the other end of the first insertion slot 541 is located outside the receiving cavity 51. Both ends of the first insertion slot 541 located inside and outside the receiving cavity 51 are provided with a first through-outlet 5411.

[0061] Further, see Figure 2 The neutral output terminal 33 is connected to a power supply pin 70. The end of the power supply pin 70 away from the neutral output terminal 33 passes through the first through-hole 5411 to the outside of the receiving cavity 51. In this way, the power supply pin 70 can be electrically connected to the circuit board inside the energy meter. At the same time, the magnetic latching relay is also provided with a power supply pin. The power supply pin of the magnetic latching relay is also electrically connected to the circuit board inside the energy meter, so as to supply power to the circuit board inside the energy meter through the two power supply pins.

[0062] By setting the first plug-in slot 541, the neutral wire output terminal 33 is located in the first plug-in slot 541. In this way, the first plug-in slot 541 can fix the neutral wire output terminal 33, avoid the neutral wire output terminal 33 from shaking or other unstable phenomena, and improve the stability of the electrical connection between the neutral wire output terminal 33 and other electrical components.

[0063] In one embodiment, see Figure 2 and Figure 3 The side wall 54 is also provided with a second insertion groove 542, and the groove wall of the second insertion groove 542 is provided with a second through outlet 5421. Specifically, the two opposite groove walls of the second insertion groove 542, one near the receiving cavity 51 and the other away from the receiving cavity 51, are provided with a second through outlet 5421.

[0064] Further, see Figure 2The electromagnet 20 includes a toroidal magnetic core and a coil 21, with the coil 21 wound around the toroidal magnetic core. Signal pins 80 are connected to both ends of the coil 21. Each signal pin 80 has a mounting base 81 located within a second insertion slot 542. The end of the signal pin 80 facing away from the coil 21 extends through a second through-hole 5421 to the outside of the receiving cavity 51, allowing the signal pin 80 to be electrically connected to other electrical components. By providing the mounting base 81, the two signal pins 80 can be precisely positioned, and the distance between them can be controlled to maintain stability, preventing instability such as wobbling and improving the stability of the electrical connection between the signal pins 80 and other electrical components.

[0065] Another embodiment of this application provides an electricity meter, including a current transformer as described in any of the above embodiments.

[0066] During assembly of the aforementioned electricity meter, the conductive busbar 30 is aligned with the first notch 112 and the second notch 122. Then, the conductive busbar 30 is pushed towards the insulating shell 10, allowing it to pass through the first notch 112 and the second notch 122 into the first through hole 111 and the second through hole 121. Next, an annular electromagnet 20 is fitted onto the conductive busbar 30 from one end, and moved along the extension direction of the conductive busbar 30 onto the cylinder 12. The first notch 112 and the second notch 122 on the insulating shell 10 facilitate the assembly of the insulating shell 10 and the conductive busbar 30.

[0067] In the description of this application, it should be understood that if 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", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0068] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0070] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A current transformer characterized by, The current transformer comprises: a conductive bar; an insulating shell, the insulating shell comprising a bottom plate and a cylinder, the bottom plate being provided with a first through hole and a first notch, the first notch penetrating an edge of the bottom plate and a hole wall of the first through hole; the cylinder having a first end, a second end and a second through hole penetrating the first end and the second end, the first end being connected to the bottom plate, the first through hole being in communication with the second through hole, the conductive bar being arranged in the first through hole and the second through hole, a side wall of the cylinder being provided with a second notch, the second notch penetrating the first end and the second end, the second notch being in communication with the first notch and the second through hole, the first notch and the second notch being used for the conductive bar to pass through to enter the first through hole and the second through hole; and an electromagnet, the electromagnet being sleeved outside the cylinder.

2. The current transformer of claim 1, wherein, The current transformer further comprises an insulating cover, the insulating cover being arranged on a side of the electromagnet away from the bottom plate, the insulating cover and the bottom plate being matched to limit axial movement of the electromagnet along the cylinder.

3. The current transformer of claim 2, wherein, The insulating cover is provided with a third through hole, the insulating cover being sleeved on the second end through the third through hole.

4. The current transformer of claim 1, wherein, The insulating shell is provided with a first clamping part, the conductive bar is provided with a second clamping part, and the first clamping part and the second clamping part are clamped and matched.

5. The current transformer of claim 4, wherein, One of the first clamping part and the second clamping part is provided with a dovetail groove, and the other of the first clamping part and the second clamping part is provided with a dovetail wedge, the dovetail wedge being arranged in the dovetail groove.

6. The current transformer of any one of claims 1 to 5, characterized in that The conductive bar comprises a main body part, a zero line input end and a zero line output end, the zero line input end being arranged at one end of the main body part, and the zero line output end being arranged at the other end of the main body part.

7. The current transformer of claim 6, wherein, The main body part comprises a first flat section, a second flat section and a third flat section, the first flat section and the second flat section being oppositely and spacedly arranged, the third flat section being arranged between the first flat section and the second flat section, one end of the third flat section being connected to the first flat section, the other end of the third flat section being connected to the second flat section, one end of the first flat section away from the third flat section being connected to the zero line input end, one end of the second flat section away from the third flat section being connected to the zero line output end, the third flat section being arranged in the first through hole and the second through hole through the first notch and the second notch, and the first flat section and the second flat section being respectively arranged at two ends of the insulating shell in the axial direction.

8. The current transformer of claim 7, wherein, The first notch and the second notch each have a width greater than or equal to a thickness of the third flat section, and the width of the first notch and the second notch is less than a width of the third flat section.

9. The current transformer of claim 6, wherein, The current transformer further comprises a shell, the shell being provided with a receiving cavity and an opening in communication with the receiving cavity, the insulating shell, the electromagnet and the main body part being arranged in the receiving cavity, and the zero line input end and the zero line output end being arranged outside the receiving cavity through the opening.

10. The current transformer of claim 9, wherein, The shell has a bottom opposite to the opening, the bottom is provided with a first through hole and a positioning cylinder, the positioning cylinder extends along the depth direction of the accommodating cavity, the positioning cylinder is provided with a second through hole penetrating through both ends of the length direction of the positioning cylinder, the first through hole and the second through hole are communicated, and the first through hole and the second through hole are used for passing the live wire input end of the magnetic latching relay; the positioning cylinder is provided with a positioning protrusion, and the positioning protrusion is positioned and matched with the second notch.

11. The current transformer of claim 9, wherein, The current transformer further comprises a filling body arranged in the accommodating cavity, the filling body is used for fixing the insulating shell, the electromagnet and the conductive row, and the side of the filling body facing the opening covers the surface of the insulating shell, the electromagnet and the main body part, so as to seal the insulating shell, the electromagnet and the main body part in the accommodating cavity.

12. The current transformer of claim 9, wherein, The shell has a side wall, the side wall is provided with a first plug-in groove body, and the groove wall of the first plug-in groove body is provided with a first through hole; The neutral wire output end is connected with a power supply pin, and the end of the power supply pin away from the neutral wire output end penetrates out of the accommodating cavity through the first through hole.

13. The current transformer of claim 9, wherein, The side wall is further provided with a second plug-in groove body, and the groove wall of the second plug-in groove body is provided with a second through hole; The electromagnet comprises an annular magnetic core and a coil, the coil is arranged around the annular magnetic core, the end of the coil is connected with a signal plug, the signal plug is provided with a fixing seat, the fixing seat is arranged in the second plug-in groove body, and the end of the signal plug away from the coil penetrates out of the accommodating cavity through the second through hole.

14. An electric energy meter, characterized by The current transformer comprises the current transformer according to any one of claims 1 to 13. The current transformer comprises the current transformer according to any one of claims 1 to 13.

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