Anti-magnetic field shunt and electric power meter thereof

Abstract

The utility model relates to an anti-magnetic field diverter and an electric power meter thereof, which comprise a main body part and a convex column, the main body part is electrically connected with a current inflow end, a resistor body and a current outflow end in sequence, the current inflow end is provided with a voltage end, and two ends of the effective resistor body are provided with sampling ends; the convex columns laterally extrude and protrude at the joint of the current inflow end and the resistor body and / or the joint of the resistor body and the current inflow end, and each convex column comprises a small column part which extrudes and protrudes upwards from the main body part and a large column part which further extrudes and protrudes upwards from the main body part below the small column part; the small column part is located above the large column part, and the outer diameter of the small column part is smaller than that of the large column part; the protruding column is used as the sampling end and / or the voltage end of the sheet-shaped diverter, and the protruding column is used for being electrically plugged and fixed with a plugging hole of a circuit board. Therefore, the anti-magnetic-field accuracy is improved, and manufacturing and welding are facilitated.

Description

Technical Field

[0001] This utility model relates to an anti-magnetic field shunt and its power meter for use in power instruments, and particularly to an anti-magnetic field shunt and its power meter applicable to the field of power transmission. Background Technology

[0002] Currently, shunts are widely used in single-phase smart energy meters due to their advantages of high metering accuracy, low temperature influence, and low cost, especially manganese copper shunts. However, due to the installation location of the shunt and the characteristics of the connecting sampling wires, manganese copper shunts will generate induced current when subjected to power frequency magnetic field interference, which will seriously affect the accuracy of the metering current.

[0003] Traditional manganese-copper shunts sample current using a single piece of manganese-copper alloy, resulting in relatively dispersed wiring. Newer shunts require the twisted-pair cables to be fixed in place with adhesive or heat-shrink tubing to prevent loosening, which is not only time-consuming and labor-intensive but also detrimental to automated production. In 2013, the State Grid Corporation of China revised its enterprise standards for electricity meters. The Q / GDW1364-2013 "Technical Specification for Single-Phase Smart Electricity Meters" added a new requirement to the electromagnetic interference test: "With 115% Un flowing through the voltage line of the electricity meter and no current in the current loop, a 0.5mT power frequency magnetic field is applied to the most sensitive point of the electricity meter. Within 20 times the theoretical starting time, the electricity meter should not produce more than one pulse output." This standard prompted the electricity meter industry to actively seek solutions to improve the electromagnetic interference resistance of electricity meters.

[0004] Currently, according to the latest domestic and international electricity meter industry requirements, higher requirements have been put forward for the anti-magnetic interference capability of electricity meters with small operating current. Especially when the operating current is 20mA or below, how to improve the accuracy of power detection in the face of magnetic field interference from uncertain directions with an intensity of 0.5mT is an urgent problem that the industry needs to solve.

[0005] Therefore, it is necessary to optimize and improve the shunt and its power meter to enhance the shunt's ability to resist power frequency magnetic field interference. Utility Model Content

[0006] The purpose of this invention is to provide an anti-magnetic field shunt and its power meter that can resist power frequency magnetic field interference under relatively small operating current and is easy to manufacture and assemble.

[0007] To achieve the above technical objectives, this utility model adopts the following technical approach:

[0008] A magnetic field shunt includes a plate-shaped shunt that can be electrically plugged into a circuit board. The plate-shaped shunt includes a main body and a protrusion. The main body is electrically connected in sequence to a current inlet, a resistor, and a current outlet. The current inlet is provided with a voltage terminal, and the effective resistor is provided with sampling terminals at both ends.

[0009] The connection between the current inlet and the resistor and / or the connection between the resistor and the current inlet are laterally extruded and protruded. The protrusion includes a small column portion that is extruded upward from the main body and a large column portion that is extruded further upward from the main body below the small column portion. The small column portion is located above the large column portion, and the outer diameter of the small column portion is smaller than that of the large column portion.

[0010] The protrusion is used as the sampling end and / or voltage end of the plate shunt, and the protrusion is used to be electrically connected and fixed to the insertion hole of the circuit board.

[0011] As a further improvement of this utility model, there is a corresponding recess below the convex column. The recess includes a small column recess located below the small column portion and a large column recess located below the large column portion. The large column recess is located below the small column recess, and the outer diameter of the small column recess is smaller than the outer diameter of the large column portion. The small column recess is formed by the compression of the small column portion, and the large column recess is formed by the compression of the large column portion.

[0012] As a further improvement of this utility model, one part of the protrusion is formed by pressing upward from the resistive body, and the other part is formed by pressing upward from the current inlet / current outlet end connected to the resistive body.

[0013] As a further improvement of this utility model, the protrusion is located in the middle of the connection between the current inlet and the resistor, and / or in the middle of the connection between the resistor and the current inlet.

[0014] As a further improvement of this utility model, the splitter is also provided with protrusions for positioning the plug-in circuit board.

[0015] As a further improvement of this utility model, the circuit board is used to be mounted parallel to the shunt, and the protrusion protrudes from the circuit board after mounting the circuit board.

[0016] As a further improvement of this utility model, the protrusion is inserted into the circuit board insertion hole and the two are electrically connected and fixed by soldering.

[0017] As a further improvement of this utility model, the shunt is elongated, and multiple shunts are provided on the circuit board to detect current in different lines.

[0018] As a further improvement of this utility model, the current inlet and current outlet are provided with through holes for electrically connecting the terminal button, and the other end of the terminal button is provided with a wiring hole for electrically connecting the cable. The shunt is used to mount the circuit board in parallel.

[0019] To achieve the above-mentioned technical objectives, the present invention may also employ the following technical methods:

[0020] An electrical meter includes an electrical meter housing and a magnetic field shunt located within the electrical meter housing.

[0021] Compared to existing technologies, this utility model features a laterally protruding post at the connection between the current inlet and the resistor, and / or at the connection between the resistor and the current inlet. The post includes a small post portion protruding upwards from the main body and a larger post portion protruding further upwards from the main body below the small post portion. The small post portion is located above the large post portion, and its outer diameter is smaller than that of the large post portion. The post serves as the sampling end and / or voltage end of the shunt, and is electrically connected and fixed to the insertion hole of the circuit board. This configuration, where the post is formed in two extrusion steps, allows for a higher post height. Furthermore, the thinner small post portion better concentrates heat during soldering, preventing instantaneous heat conduction and thus improving soldering performance. This significantly improves soldering efficiency, reduces the overall resistance of the shunt, and provides strong anti-interference capabilities and high reliability. Even when applied to extremely small operating currents, the anti-magnetic field shunt exhibits minimal metering accuracy in the face of strong magnetic field interference. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the plate-shaped diverter according to the first embodiment of this utility model;

[0023] Figure 2 yes Figure 1 A structural diagram from another angle.

[0024] Figure 3 yes Figure 1 A structural diagram from another angle.

[0025] Figure 4 This is a partially enlarged schematic diagram of the sheet-like distributor after the small column portion has been extruded and formed according to the first embodiment of this utility model.

[0026] Figure 5 This is a partially enlarged schematic diagram of the sheet-like distributor of the first embodiment of this utility model after the large column part has been extruded and formed.

[0027] Figure 6 This is a schematic diagram of the anti-magnetic field shunt and circuit board of the first embodiment of this utility model.

[0028] Figure 7 This is a schematic diagram of the structure of the anti-magnetic field shunt after it is connected to the circuit board according to the first embodiment of this utility model.

[0029] Figure 8 This is a schematic diagram of the structure of the anti-magnetic field shunt after it is plugged into and soldered onto the circuit board according to the first embodiment of this utility model.

[0030] Figure 9 This is a schematic diagram of the anti-magnetic field shunt, terminal block, and circuit board according to the second embodiment of this utility model.

[0031] Figure 10 This is a schematic diagram of the structure of the anti-magnetic field shunt, the terminal block and the circuit board after they are connected according to the second embodiment of this utility model.

[0032] Figure 11 This is a schematic diagram of the structure of the anti-magnetic field shunt, the terminal block and the circuit board after being plugged in and soldered according to the second embodiment of this utility model.

[0033] Figure label:

[0034] 100 main body of the shunt 100

[0035] Current inlet 11, terminal 111

[0036] Resistor 12 Current outlet 13

[0037] Terminal 131, Protrusion 2

[0038] First protrusion 21 Second protrusion 22

[0039] Third protrusion 23 Fourth protrusion 24

[0040] Recessed portion 20 Column portion 201

[0041] Large column part 202 Small column concave part 203

[0042] Large pillar recess 204 circuit board 3

[0043] Components 30, Solder 4

[0044] Shunt 500 Current inlet 51

[0045] Through hole 511 Resistor 52

[0046] Current outlet 53, through hole 531

[0047] First protrusion 541 Second protrusion 542

[0048] Third protrusion 543 Terminal button 6

[0049] Wiring hole 62, circuit board 7

[0050] Soldering 8 Detailed Implementation

[0051] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0052] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0053] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0054] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0056] Please refer to Figures 1 to 8The diagram shown is a structural schematic of the first embodiment of the anti-magnetic field shunt 100 of this utility model. The anti-magnetic field shunt 100 includes a sheet-shaped shunt 100 capable of electrically connecting to a circuit board 3. The sheet-shaped shunt 100 includes a main body 1 and protrusions 2. The main body 1 includes a current inlet 11, a resistor 12, and a current outlet 13 connected in sequence. The current inlet 11 has a voltage terminal, and the effective resistor 12 has sampling terminals at both ends. Specifically, the protrusions 2 are laterally protruded from the connection point between the current inlet 11 and the resistor 12, and / or the connection point between the resistor 12 and the current inlet 11. The location of the protrusions 2 at the "connection point" can be entirely on the resistor 12, partially on the resistor 12, or not on the resistor 12; all of these are within the scope of protection of this utility model. The protruding post 2 includes a small post portion 201 that protrudes upward from the main body portion 1 and a large post portion 202 that protrudes further upward from the main body portion 1 below the small post portion 201. The small post portion 201 is located above the large post portion 202, and the outer diameter of the small post portion 201 is smaller than that of the large post portion 202. The protruding post 2 serves as the sampling end and / or voltage end of the sheet-like shunt 100. That is, the sampling end and voltage end can be entirely or partially composed of the protruding post 2. As long as the protruding post 2 is included, it is within the protection scope of this utility model. The protruding post 2 is used for electrical insertion and fixation with the insertion hole of the circuit board 3. With this configuration, the protruding post 2 is formed by two extrusion steps. Compared to a single extrusion, this allows the protruding post 2 to have a higher height, facilitating its insertion and fixation with the circuit board 3. This extrusion method greatly simplifies the manufacturing process of the main body 1 and the protruding post 2 of the distributor 100, improving manufacturing efficiency. Furthermore, the smaller post portion 201 is thinner, allowing the solder 4 to be better applied to it during the electrical insertion and fixation process between the protruding post 2 and the circuit board 3. The smaller post portion 201 can better concentrate the heat during the soldering process, preventing heat from being instantly conducted outwards and affecting the soldering effect, thus greatly improving the soldering effect. It is worth noting that the cross-section of the protruding post 2 is not limited to a circle; various cross-sectional shapes are within the protection scope of this utility model.

[0057] In a preferred embodiment, the protruding post 2 can be formed by a specially designed supporting component (not shown) pressing the main body 1 under a secondary pressure. Thus, a recess 20 is formed below the protruding post 2 due to the pressure of the supporting component. Specifically, the recess 20 includes a small post recess 203 located below the small post portion 201 and a large post recess 204 located below the large post portion 202. The large post recess 204 is located below the small post recess 203, and the outer diameter of the small post recess 203 is smaller than the outer diameter of the large post portion 202. Figure 2As shown, the lateral cross-section of the concave portion 20 is substantially "convex" in shape. The small-column concave portion 203 is formed by the extrusion molding of the small-column portion 201, and the large-column concave portion 204 is formed by the extrusion molding of the large-column portion 202. Such a setting can facilitate the extrusion molding of the convex column 2. Of course, in other embodiments of the present invention, the concave portion 20 may not be provided, or Figure 3 As shown, the concave portion 20 may also have a rectangular lateral cross-section due to different extrusion methods.

[0058] In a preferred manner, a part of the convex column 2 is extruded upward from the resistor body 12, and another part is extruded upward from the current inflow end 11 / current outflow end 13 connected to the resistor body 12. Figure 2 As shown, taking the left convex column 2 as an example, approximately half of a convex column 2 is extruded and protruded upward from the current inflow end 11, and the other half is protruded upward from the left end of the resistor body 12; taking the right convex column 2 as an example, approximately half of a convex column 2 is extruded and protruded upward from the current outflow end 13, and the other half is protruded upward from the right end of the resistor body 12. With such a setting, the convex column 2 can better adhere to the resistor body 12, and the two convex columns 2 at the left and right ends of the resistor body 12 can more accurately sample the electrical signals generated at the left and right ends of the resistor body 12, avoiding unnecessary interference and reducing the overall resistance of the shunt.

[0059] The convex column 2 is located in the middle of the connection between the current inflow end 11 and the resistor body 12, and / or in the middle of the connection between the resistor body 12 and the current inflow end 11. Figure 2 As shown, in the up-down direction in the figure, the left convex column 2 is just located in the middle of the connection line between the current inflow end 11 and the resistor body 12, and the right convex column 2 is just located in the middle of the connection line between the resistor body 12 and the current outflow end 13. With such a setting, the two convex columns 2 can better sample the signals at the left and right ends of the resistor body 12, and can better avoid the influence of external magnetic field interference on the accuracy of the sampling signals at the left and right ends of the resistor body 12.

[0060] More preferably, the voltage terminal is provided at the current inflow end 11, and the voltage terminal is in the same direction as the arrangement direction of the convex columns 2 in the extending direction of the main body portion 1. Figure 2 As shown, in the left-right direction in the figure, that is, the extending direction of the main body portion 1, taking the arrangement direction of the left and right convex columns 2 as a straight line, the voltage terminal is just located on this straight line, and the voltage terminal can be set as the convex column 2. Thus, after the voltage terminal applies a voltage, the circuit can flow evenly on the main body portion 1, better ensuring the accuracy of the sampling of the convex column 2, and facilitating the plug-in installation of the voltage terminal and the circuit board 3.

[0061] The circuit board 3 is mounted parallel to the shunt 100. The protrusion 2 protrudes from the circuit board 3 after mounting. The protrusion 2 is inserted into the insertion hole of the circuit board 3 and electrically connected and fixed by soldering with solder 4. With this configuration, the protrusion 2 is easier to solder onto the circuit board 3, and the circuit on the circuit board 3 can directly receive the signals collected on the protrusion 2 and convert them in a timely manner through the components 30 on the circuit board 3, thereby improving the detection accuracy of the power meter.

[0062] In the first embodiment, the splitter 100 is elongated and includes flat terminals 111 and 131 extending further from both ends of the main body 1. After the circuit board 3 is mounted on the splitter 100, the terminals 111 and 131 are laterally exposed above the circuit board 3. This arrangement allows the terminals 111 and 131 to be more easily electrically connected to external cables. Figures 6 to 8 As shown, multiple shunts 100 can be arranged side by side on a large circuit board 3, so that one ammeter can detect multiple power lines at the same time, realizing the function of one meter for multiple measurements.

[0063] The shunt 100 is also provided with protrusions 2 for positioning and inserting the circuit board 3. The protrusions 2 can be formed by pressing together with the voltage end and the sampling end. With this arrangement, the left and right directions of the shunt 100 can be interchanged, and the extra protrusions 2 can be inserted and positioned with the circuit board 3, thereby improving the installation and fixation of the circuit board 3. As shown in Figures 1 to 3, from left to right, there are a first protrusion 21, a second protrusion 22, a third protrusion 23, and a fourth protrusion 24, where the first protrusion 21 is the voltage end, the second protrusion 22 and the third protrusion 23 are the sampling ends, and the fourth protrusion 24 is the protrusion 2 used to position and insert the circuit board 3.

[0064] Even when the anti-magnetic field shunt 100 is applied to extremely small operating currents, its meter accuracy can be minimal in the face of strong magnetic field interference. For example, at an operating current of 20mA or below, under magnetic field interference of 0.5mT, the meter accuracy error of the anti-magnetic field shunt 100 can be less than 10%, thus achieving excellent anti-magnetic field interference performance of the power meter under extremely small operating currents.

[0065] The circuit board 3 is equipped with several electrical information modules, and the voltage terminal and sampling terminal are connected to the electrical information modules. With this configuration, after the anti-magnetic field shunt 100 detects the sampling information, it immediately converts it into a digital signal through the adjacent electrical information modules for further transmission. This digital signal is unaffected by magnetic field interference, thus further improving the measurement accuracy of the anti-magnetic field shunt 100. The electrical information module may include a filter element, an analog-to-digital converter chip, and / or a metering chip. That is, in different embodiments of this utility model, the electrical information module may selectively include any one, several, or all of the filter element, analog-to-digital converter chip, and / or metering chip. With this configuration, the electrical information module can convert the sampling information detected by the anti-magnetic field shunt 100 into a digital signal for transmission.

[0066] In this embodiment, the resistor 12 is a manganin resistor. This achieves excellent sampling accuracy. Of course, in other embodiments of this invention, the resistor 12 can also be other types of resistors.

[0067] This utility model also protects an electric meter (not shown), including a casing (not shown) and an anti-magnetic field shunt 100 located inside the casing. The core component of the electric meter lies in the anti-magnetic field interference capability of the anti-magnetic field shunt 100. The anti-magnetic field interference capability of the anti-magnetic field shunt 100 under low operating current and high magnetic field interference conditions enables the electric meter to have excellent power data detection accuracy, giving it a core competitive advantage in the market.

[0068] This utility model also protects a method for manufacturing an anti-magnetic field shunt 100, comprising the following steps: manufacturing a main body 1 of the plate-shaped shunt 100, wherein the main body 1 is electrically connected in sequence to a current inlet 11, a resistor 12, and a current outlet 13; laterally pressing a protruding column 2 at the connection between the current inlet 11 and the resistor 12 and / or the connection between the resistor 12 and the current inlet 11, including first pressing a small column portion 201 upward from the main body 1, and then pressing the small column portion 201... The lower part of the main body 1 is further pressed upward to form a large column portion 202. The small column portion 201 is located above the large column portion 202, and the outer diameter of the small column portion 201 is smaller than that of the large column portion 202. A voltage terminal is provided on the current inlet 11. The protruding post 2 is used as the sampling terminal and / or voltage terminal of the sheet shunt 100. The protruding post 2 located at both ends of the effective resistor 12 is used as the sampling terminal. The protruding post 2 is used to be electrically connected and fixed to the insertion hole of the circuit board 3. With this configuration, the protruding post 2 is formed by two extrusion steps. Compared to a single extrusion, the protruding post 2 can have a higher height, which is beneficial for electrical connection and fixation with the circuit board 3. This extrusion method greatly simplifies the manufacturing process of the main body 1 and the protruding post 2 of the shunt 100, improving manufacturing efficiency. Furthermore, the smaller post portion 201 is thinner. During the electrical connection and fixation process of the protruding post 2 with the circuit board 3, the smaller post portion 201 can better concentrate the heat during the soldering process, avoiding instantaneous heat conduction outwards and affecting the soldering effect. This allows the solder 4 to be better applied to the smaller post portion 201, greatly improving the soldering effect. It is worth noting that the cross-section of the protruding post 2 is not limited to a circle; various cross-sectional shapes are within the protection scope of this utility model. The sheet-like shunt 100 enables the anti-magnetic field shunt 100 to have excellent anti-magnetic field interference performance under low operating current and high magnetic field interference conditions, improving the accuracy of power data detection in power meters. In this utility model, the order of the above steps is not limited and can be adjusted according to the actual situation, all of which are within the protection scope of this utility model.

[0069] In a preferred embodiment, the method for manufacturing the anti-magnetic field shunt 100 involves pressing the small column portion 201 into a protrusion using a supporting member (not shown), forming a corresponding small column recess 203 below the small column portion 201. The method further involves another, thicker supporting member pressing the main body portion 1 upwards below the small column recess 203 to form the large column portion 202, with the small column recess 203 located below the large column portion 202. The large column recess 204 is located below the small column recess 203, and the outer diameter of the small column recess 203 is smaller than the outer diameter of the large column portion 202. The small column recess 203 is formed by the pressing process of the small column portion 201, and the large column recess 204 is formed by the pressing process of the large column portion 202. This arrangement facilitates the pressing and forming of the protruding column 2. Of course, in other embodiments of this invention, the recess may not be provided.

[0070] Please refer to Figures 9 to 11 As shown, this is a second embodiment of the magnetic field shunt 500 of the present invention, which is shorter and smaller than the shunt 100 of the first embodiment. The current inlet 51 and current outlet 53 are provided with through holes 511 and 531 for electrically connecting to a terminal block 6. The other end of the terminal block 6 is provided with a wiring hole 62 for electrically connecting a cable. The shunt 500 is used to mount the circuit board 7 in parallel. This arrangement allows for better connection to external cables. The shunt 500 is provided with a first protrusion 541, a second protrusion 542, and a third protrusion 543, which serve as a voltage terminal and two sampling terminals, respectively. After the first protrusion 541, the second protrusion 542, and the third protrusion 543 are inserted into the circuit board 7, they are soldered and fixed with solder 8.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0072] The directional terms used in the various technical features described in the above embodiments, such as front, back, left, right, up, and down, are used only for the convenience of describing and understanding the various technical features, and do not constitute a limitation on specific directions in the actual use of the technical solution.

[0073] 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.

[0074] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A magnetic field shunt, characterized by: The sheet shunt capable of electrically plugging the circuit board comprises a main body and a protruding column, the main body comprises a current inflow end, a resistance body and a current outflow end connected in sequence, the current inflow end is provided with a voltage end, and effective resistance body is provided with a sampling end; The protruding column protrudes laterally at the connection between the current inflow end and the resistance body and / or the connection between the resistance body and the current inflow end, the protruding column comprises a small column part protruding upward from the main body and a large column part protruding upward from the main body below the small column part, the small column part is above the large column part, and the outer diameter of the small column part is smaller than that of the large column part; The protruding column is used as the sampling end and / or voltage end of the sheet shunt, and is used to be electrically plugged and fixed with the plugging hole of the circuit board.

2. A magnetic field diverter according to claim 1, characterized in that: The protruding column is correspondingly provided with a recess below, the recess comprises a small column recess below the small column part and a large column recess below the large column part, the large column recess is below the small column recess, and the outer diameter of the small column recess is smaller than that of the large column part, the small column recess is formed by extrusion of the small column part, and the large column recess is formed by extrusion of the large column part.

3. A magnetic field diverter according to claim 1, wherein: One part of the protruding column is extruded upward from the resistance body, and the other part is extruded upward from the current inflow end / current outflow end connected with the resistance body.

4. A magnetic field diverter according to claim 1, wherein: The protruding column is located in the middle of the connection between the current inflow end and the resistance body, and / or in the middle of the connection between the resistance body and the current inflow end.

5. A magnetic field diverter according to claim 1, wherein: The shunt is further provided with a protruding column for positioning the plugged circuit board.

6. A magnetic field diverter according to claim 1, wherein: The circuit board is used to be installed in parallel on the shunt, and the protruding column protrudes from the circuit board after the circuit board is installed.

7. A magnetic field diverter according to claim 1, wherein: The protruding column is plugged into the plugging hole of the circuit board and is fixed by soldering to realize electrical connection.

8. A magnetic field diverter according to claim 1, wherein: The shunt is in a long strip shape, and a plurality of shunts are provided on the circuit board to detect current of different lines.

9. A magnetic field diverter according to claim 1, wherein: The current inflow end and the current outflow end are provided with through holes for electrically connecting terminal buttons, the other end of the terminal button is provided with a terminal hole for electrically plugging a cable, and the shunt is used to be installed in parallel on the circuit board.

10. An electric power meter characterized by: The anti-magnetic field shunt according to any one of claims 1 to 9 is arranged in the power meter shell.

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