Manganin shunt assembly and intelligent electric meter

Abstract

The invention discloses a manganin shunt assembly and an intelligent electric meter, and belongs to the technical field of electric power measurement. The intelligent electric meter comprises the manganin shunt assembly. Particularly, the manganin diverter assembly comprises a diverting unit, a fixing unit and an induction unit. The shunting unit comprises a first shunt and a second shunt which are respectively provided with a conductive main body, a current sampling structure and conductive connecting parts at the two ends, and the conductive connecting parts are provided with installation positioning structures. And the second diverter is arranged in the middle area of the first diverter, is respectively connected in series in a live line loop and a zero line loop, and is used for simultaneously measuring current and detecting electric leakage by comparing the current values. The sensing unit is electrically connected with the second shunt. By optimizing the structural layout, the current measurement precision and the electric leakage detection reliability are improved, and the device has good heat dissipation performance and installation stability, is suitable for equipment such as an intelligent electric meter, and can effectively guarantee the power utilization safety.

Description

Technical Field

[0001] This invention belongs to the field of power measurement technology, specifically referring to a manganese copper shunt assembly and a smart meter. Background Technology

[0002] In power systems, electricity meters are crucial devices for measuring electrical energy consumption, and shunts, as key components of electricity meters, convert large currents into small voltage signals to facilitate metering. With the development of the power industry, increasingly higher demands are being placed on the measurement accuracy, safety, and reliability of electricity meters.

[0003] Traditional electricity meters typically use a single shunt for current measurement. However, a single shunt can only measure the current of one phase. While this design achieves basic current measurement, it has a critical flaw: in a normal electrical circuit, the live wire current and the neutral wire current should theoretically be exactly equal. If there is a leakage in the circuit, the live wire current will be greater than the neutral wire current. Since a single shunt cannot simultaneously acquire the current data of both the live and neutral wires, it cannot determine whether there is a leakage by comparing the difference between the two. This results in the meter lacking leakage detection capability and failing to meet the needs of electrical safety monitoring. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a manganese copper shunt assembly to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted by the present invention is as follows: On the one hand, a manganese copper shunt assembly is proposed, including a shunt unit, a fixing unit and a sensing unit. The shunt unit includes a conductive body, a current sampling structure and two conductive connection parts. The conductive connection parts are disposed at both ends of the conductive body, and the conductive connection parts are provided with a mounting and positioning structure. The fixing unit includes an insulating substrate, on which are provided a receiving portion adapted to the conductive connection portion, a heat dissipation structure, a through structure corresponding to the mounting and positioning structure, and an overall positioning structure; The current splitting unit includes a first current splitter and a second current splitter. The second current splitter is disposed in the middle region of the first current splitter. The first current splitter and the second current splitter are configured to be connected in series in the live wire and neutral wire circuits, respectively. The sensing unit is electrically connected to the second current splitter.

[0006] Furthermore, the conductive body of the first shunt is a first conductive sheet, the current sampling structure of the first shunt is a sampling point set on the first conductive sheet, the conductive connection part of the first shunt is a first conductive post, and the mounting and positioning structure of the first shunt is a first mounting hole.

[0007] Further, the conductive main body of the second shunt is a second conductive sheet, the second conductive sheet passes through the sensing unit, the current sampling structure of the second shunt is a sampling line connected to the second conductive sheet, the conductive connecting part of the second shunt is a second conductive column, and the mounting and positioning structure of the second shunt is a second mounting hole.

[0008] Further, the sampling points are a plurality of metal contacts arranged on the first conductive sheet, the distance between adjacent two metal contacts is 5-15 mm, the diameter of the metal contact is 1-3 mm, and the height of the metal contact is 0.1-0.3 mm.

[0009] Further, the conductive connecting part is made of brass, the conductive connecting part is a first conductive column and a second conductive column, the diameter of the first conductive column and the second conductive column is 5-10 mm, and the length is 10-20 mm. The mounting and positioning structure is a mounting hole, the diameter of the mounting hole is 2-4 mm, the depth is 5-15 mm, and the mounting hole is provided with an internal thread.

[0010] Further, the insulating base body is an insulating shell, the accommodating part is a mounting groove, the number is four, the four mounting grooves are respectively arranged corresponding to the conductive connecting part, the depth of the mounting groove is 5-15 mm, and the inner diameter of the mounting groove is larger than the diameter of the conductive connecting part by 0.1-0.3 mm.

[0011] Further, the heat dissipation structure is a heat dissipation fin arranged corresponding to the mounting groove, the number of the heat dissipation fins is 5-15, the height of the heat dissipation fin is 3-8 mm, the spacing between the heat dissipation fins is 1-3 mm, and the thickness of the heat dissipation fin is 0.5-1.5 mm. The through structure is an avoidance hole, the number is four, the diameter of the avoidance hole is larger than the diameter of the mounting and positioning structure by 0.5-1 mm, and the overall positioning structure is a positioning hole arranged at the middle position of the insulating shell.

[0012] Further, the sensing device is a mutual inductor, the mutual inductor is a current transformer, and the inner diameter of the mutual inductor is the same as the width of the conductive main body.

[0013] The second aspect of the embodiment of the application further provides an intelligent electric meter, which comprises a manganese copper shunt assembly, the first shunt and the second shunt of the manganese copper shunt assembly are respectively connected in series in the live wire and zero line loop of the intelligent electric meter, are used for simultaneously measuring the current of the live wire and the zero line, and detect the leakage in the loop by comparing the current values of the live wire and the zero line.

[0014] Advantages: The smart meter connects the first shunt and the second shunt to the live loop and the zero loop of the circuit through the manganese-copper shunt assembly in series, measures the current values of the live loop and the zero loop synchronously, and compares them in real time, so that the leakage in the loop can be detected. When the difference between the two exceeds the set threshold, it is determined that there is a leakage fault, and the meter will send an alarm signal, thereby reducing the safety hazard of electricity use.

[0015] The measurement result of the second shunt is verified by the inductive unit, further improving the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS Figure 1 A structure schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application. Figure 2 A top view schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application. Figure 3 An exploded structure schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application. Figure 4 An insulating base structure schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application. Figure 5 A first shunt structure schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application. Figure 6 A second shunt structure schematic diagram of a manganese-copper shunt assembly is proposed for the embodiment of the application.

[0016] 1, first shunt; 11, first conductive sheet; 12, sampling point; 13, first conductive column; 14, first mounting hole; 2, second shunt; 21, second conductive sheet; 22, sampling line; 23, second conductive column; 24, second mounting hole; 3, insulating base; 31, insulating shell; 32, mounting groove; 33, heat dissipation fin; 34, avoidance hole; 35, positioning hole; 4, mutual inductor.

[0017] The accompanying drawings are used to provide a further understanding of the embodiments and constitute a part of the specification, which are used together with the embodiments to explain and do not constitute a limitation on the embodiments. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope.

[0019] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0020] like Figures 1-6 As shown, in some embodiments, a manganese-copper shunt assembly comprises three main functional modules: a shunt unit, a fixed support unit, and a signal sensing unit. The shunt unit includes at least two independent shunt units, each consisting of a conductive body, a current sampling structure, and conductive connecting parts. The conductive body is cast from a specially formulated manganese-copper alloy, exhibiting excellent conductivity and stable temperature characteristics. The two conductive connecting parts are welded and fixed to both ends of the conductive body.

[0021] The fixing unit is composed of an insulating substrate 3, which has a receiving part that matches the shape of the conductive connection part. The bottom surface of the substrate also adopts an integrated heat dissipation structure composed of arrayed heat dissipation fins 33. At the same time, a through threaded fixing hole is provided at the position corresponding to the installation and positioning structure of the conductive connection part.

[0022] In practical implementation, the shunt unit comprises two independent parts: a first shunt 1 and a second shunt 2. The second shunt 2 is located in the middle region of the first shunt 1, and the two are kept at an insulated distance. Specifically, the first shunt 1 and the second shunt 2 are connected in series to the live wire circuit and the neutral wire circuit, respectively. By synchronously measuring the current values ​​of the live wire and the neutral wire and performing digital real-time comparison, leakage current in the circuit can be accurately detected.

[0023] It should be noted that the second shunt 2 is located in the middle area of ​​the first shunt 1, and a reasonable distance is maintained between the two and between the shunt 2 and the inner wall of the insulating housing 3, which reduces electromagnetic interference; the current sampling structure is reasonably designed, the sampling signal is stable, and it is less affected by external interference.

[0024] The connection between the sensing unit and the second shunt 2 includes a built-in signal amplification circuit and an AD conversion module for acquiring and processing current signals and outputting standardized detection signals. Verification of the measurement results via the sensing unit further improves measurement accuracy.

[0025] In the operation of the manganese-copper shunt assembly of the present invention, the first shunt 1 is connected in series in the live wire circuit, and the second shunt 2 is connected in series in the neutral wire circuit. When current flows through the first shunt 1 and the second shunt 2, a voltage drop proportional to the current is generated on them. The voltage drop signals on the first shunt 1 and the second shunt 2 are sampled and acquired respectively, and these signals are transmitted to the main control chip.

[0026] The main control chip processes and calculates the two voltage drop signals to obtain the current values ​​of the live wire and the neutral wire. By comparing these two current values, leakage in the circuit can be detected: when the difference between the two exceeds a set threshold, it is determined that there is a leakage fault, and the meter will issue a corresponding alarm signal.

[0027] like Figure 1 and Figure 5 As shown, in some embodiments, the conductive body of the first shunt 1 is a first conductive sheet 11, which is made of high-purity manganese copper alloy. This material has an extremely low temperature coefficient, which can effectively reduce the influence of temperature changes on the resistance value and ensure the stability of measurement accuracy.

[0028] The current sampling structure of the first shunt 1 is a sampling point 12 set on the first conductive sheet 11. The sampling point 12 is made of copper alloy and is fixed to the first conductive sheet 11 by welding, forming a good electrical connection with the first conductive sheet 11. The sampling point 12 is used to collect the voltage drop signal on the first conductive sheet 11, providing a basic signal for current measurement.

[0029] The first conductive sheet 11 has first conductive posts 13 at both ends, which serve as conductive connections. These posts are made of brass, which has good conductivity and mechanical strength, ensuring stable current transmission and structural robustness. The first conductive posts 13 have a diameter of 5-10 mm and a length of 10-20 mm, and are fixedly connected to both ends of the first conductive sheet 11 by welding, ensuring welding strength and conductivity.

[0030] A first mounting hole 14, serving as a mounting and positioning structure, is provided on the first conductive post 13. The diameter of the first mounting hole 14 is 2-4 mm, and the hole is provided with internal threads. The first mounting hole 14 is used to fix the first shunt 1 to the fixing member 3, ensuring the installation stability of the first shunt 1.

[0031] like Figure 1 and Figure 6 As shown, in some embodiments, the structure of the second shunt 2 is the same as that of the first shunt 1. Specifically, the conductive body of the second shunt 2 is the second conductive sheet 21, which is also made of high-purity manganese copper alloy. Its thickness and width are the same as those of the first conductive sheet 11 to ensure that it has the same electrical performance as the first shunt 1, which facilitates subsequent current comparison and leakage current monitoring.

[0032] The second conductive sheet 21 passes through the inductive unit, and the transformer 4 can induct the current change on the second conductive sheet 21 to generate an inductive signal for verifying and assisting the measurement of the current measured by the second shunt 2, thereby improving the measurement accuracy.

[0033] The second conductive sheet 21 is connected with a sampling line 22 as a current sampling structure. The sampling line 22 is a copper core insulated wire. One end of the sampling line 22 is connected with the second conductive sheet 21 by welding, and the other end is provided with a terminal for connecting with an external measurement circuit. The sampling line 22 is used for transmitting the voltage drop signal on the second conductive sheet 21 to the measurement circuit.

[0034] The second conductive sheet 21 is connected with a second conductive column 23 as a conductive connection part at both ends. The material, size and connection mode of the second conductive column 23 are the same as those of the first conductive column 13, thereby ensuring the electrical performance consistency with the first shunt 1.

[0035] A second mounting hole 24 as a mounting and positioning structure is arranged on the second conductive column 23. The size and structure of the second mounting hole 24 are the same as those of the first mounting hole 14, thereby being used for fixing the second shunt 2 on the fixing part 3.

[0036] As shown in FIG. 1, Figure 5 In some embodiments, the sampling point 12 is a plurality of metal contacts arranged on the first conductive sheet 11. The metal contacts are uniformly distributed, the distance between two adjacent metal contacts is 5-15 mm, the diameter of the metal contact is 1-3 mm, and the height of the metal contact is 0.1-0.3 mm. The metal contacts are connected with an external measurement circuit through a copper core insulated wire, thereby ensuring that the voltage drop signal on the first conductive sheet 11 is transmitted to the measurement circuit.

[0037] As shown in FIG. 1, Figure 5 and Figure 6 In some embodiments, the conductive connection parts are made of brass, thereby ensuring that the two parts have consistent electrical performance. Specifically, the conductive connection parts are the first conductive column 13 and the second conductive column 23, and the diameter is in the range of 5-10 mm, preferably 6-8 mm. This size range takes into account the requirements of electrical conductivity and mechanical strength, thereby ensuring sufficient electrical cross-sectional area. The length is controlled to be 10-20 mm through multiple experiments, and the typical value is 15 mm. This length can ensure good electrical conductivity, meet the space layout requirements, and facilitate installation and maintenance.

[0038] The installation positioning structure is an installation hole, the diameter of the installation hole is 2-4mm, and the optimal diameter is 3mm, and an internal thread is arranged in the installation hole to realize reliable threaded connection with a matched bolt. This design not only ensures the stability of the assembly installation, but also guarantees the reliability of the conductive connection, and facilitates the later disassembly and maintenance. The design of the entire conductive connection part fully considers the conductive performance, mechanical strength, and installation convenience and other factors.

[0039] As shown in Figures 1-4 In some embodiments, the insulating base 3 is an insulating shell 31 made of glass fiber material, which has good insulation performance, heat resistance and mechanical strength, and can meet the requirements of the use environment inside the ammeter. The insulating shell 31 is provided with installation grooves 32 as accommodating parts, and the number of installation grooves 32 is four, which are respectively arranged corresponding to the two first conductive columns 13 of the first shunt 1 and the two second conductive columns 23 of the second shunt 2. The depth of the installation groove 32 is in the range of 5-15mm, and the optimal depth is 10mm. The inner diameter is 0.1-0.3mm larger than the diameter of the first conductive column 13 and the second conductive column 23, and the optimal inner diameter is 0.2mm. This precise tolerance design can not only ensure the smooth insertion of the conductive connection part, but also guarantee the close fit between the two, avoiding the phenomenon of looseness.

[0040] Further, in some embodiments, the insulating shell 31 is also provided with heat dissipation fins 33 as heat dissipation structures, which are arranged corresponding to the installation grooves 32, and the number is 5-15, preferably 10. The height of the heat dissipation fin 33 is 3-8mm, and the optimal height is 5mm. The spacing between them is 1-3mm, and the optimal spacing is 2mm. The thickness is 0.5-1.5mm, and the optimal thickness is 1mm. The heat dissipation fin 33 is integrally formed with the insulating shell 31, which can effectively increase the heat dissipation area and improve the heat dissipation efficiency. The heat generated during the operation of the shunt is promptly dissipated, avoiding the temperature from being too high to cause the resistance value to drift, and ensuring the long-term working stability of the assembly.

[0041] The insulating shell 31 is provided with a relief hole 34 as a through structure, and the number of the relief hole 34 is four, which are respectively arranged corresponding to the first installation hole 14 and the second installation hole 24. The screw passes through the relief hole 34 to fix the conductive column in the installation groove 32.

[0042] The insulating shell 31 is also provided with a positioning hole 35 as a whole positioning structure, which is arranged at the middle position of the insulating shell 31, and is used to fix the entire manganese-copper shunt assembly in the ammeter shell, ensuring that the installation position of the assembly in the ammeter is accurate and firm.

[0043] As shown in Figures 1-3As shown, in some embodiments, the inductive device adopted by the assembly is a mutual inductor 4, specifically, a current mutual inductor 4 specially used for current measurement. In terms of structural design, the inner diameter of the mutual inductor 4 is accurately calculated to be completely consistent with the width of the conductive main body, and such equal-size design ensures the accuracy and stability of current measurement.

[0044] When the manganese-copper shunt assembly of the present application is assembled, first, the second conductive sheet 21 is passed through the center hole of the mutual inductor 4, then the two second conductive columns 23 of the second shunt 2 are placed into the middle two installation slots 32, and finally the two first conductive columns 13 of the first shunt 1 are respectively placed into the remaining two installation slots 32 on the insulating shell 31, ensuring that the second shunt 2 is arranged in the middle region of the first shunt 1, and the distance between two adjacent first conductive columns 13 and second conductive columns 23 is 10 mm. Such layout design can effectively reduce the electromagnetic interference between the two shunts and improve the measurement accuracy.

[0045] Then, the first shunt 1 and the second shunt 2 are firmly fixed on the insulating shell 31 by passing screws through the avoidance holes 34 and the installation holes. Finally, the entire assembly is fixed in the meter shell through the positioning holes 35, and the sampling points 12, the sampling lines 22 and the output end of the mutual inductor 4 are connected with the master control chip in the meter.

[0046] Further, in some embodiments, a smart meter includes the above-mentioned manganese-copper shunt assembly, wherein the first shunt 1 is connected in series in the live line circuit of the smart meter for measuring the live line current, the second shunt 2 is connected in series in the zero line circuit of the smart meter for measuring the zero line current, and the leakage in the circuit is detected by comparing the current values of the two, and the leakage alarm function of the meter is triggered.

[0047] The specific working process of the present application is as follows: the first shunt 1 is connected in series in the live line circuit, and the second shunt 2 is connected in series in the zero line circuit. When the current passes through the first conductive sheet 11 and the second conductive sheet 21, a voltage drop proportional to the current is generated thereon. The sampling points 12 collect the voltage drop signal on the first conductive sheet 11, and the sampling lines 22 collect the voltage drop signal on the second conductive sheet 21, which are transmitted to the master control chip of the smart meter.

[0048] The master control chip processes and calculates the two voltage drop signals to obtain the current values of the live line and the zero line. By comparing the two current values, the leakage in the circuit can be detected: when the difference between the two exceeds the set threshold, it is judged that there is a leakage fault, and the smart meter will issue a corresponding alarm signal. At the same time, the mutual inductor 4 senses the current on the second conductive sheet 21, and the generated induction signal can be used to verify the current measured by the second shunt 2, further improving the measurement accuracy.

[0049] It is to be noted that, as used in this document, the term "indicia" is intended to encompass any indicia, whether visible or not, and whether or not detectable by the human senses. It is to be understood that the terms "first" and "second" and the like are used merely to distinguish one element from another, and are not intended to require or imply that the elements so designated are in any way either sequential or singular. Furthermore, the terms "comprise", "comprises", "comprising", "include", "includes", "including" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0050] The above description of the embodiments has been presented for the purpose of illustration and description, and is not intended to limit the disclosure to the precise forms described. The above description is merely one form of the implementation of the present disclosure, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by the disclosure, without departing from the spirit of the disclosure, similar structural forms and embodiments can be designed without creative design, and all should belong to the protection scope.

Claims

1. A manganese-copper shunt assembly, characterized in that, It includes a current shunting unit, a fixing unit, and a sensing unit. The current shunting unit includes a conductive body, a current sampling structure, and two conductive connecting parts. The conductive connecting parts are disposed at both ends of the conductive body, and the conductive connecting parts are provided with a mounting and positioning structure. The fixing unit includes an insulating substrate (3), and the insulating substrate (3) is provided with a receiving part adapted to the conductive connection part, a heat dissipation structure, a through structure corresponding to the mounting and positioning structure, and an overall positioning structure. The shunt unit includes a first shunt (1) and a second shunt (2). The second shunt (2) is located in the middle region of the first shunt (1). The first shunt (1) and the second shunt (2) are configured to be connected in series in the live wire and neutral wire circuits, respectively. The sensing unit is electrically connected to the second shunt (2).

2. The manganese-copper shunt assembly according to claim 1, characterized in that, The conductive body of the first shunt (1) is the first conductive sheet (11), the current sampling structure of the first shunt (1) is the sampling point (12) set on the first conductive sheet (11), the conductive connection part of the first shunt (1) is the first conductive post (13), and the installation positioning structure of the first shunt (1) is the first mounting hole (14).

3. The manganese-copper shunt assembly according to claim 1, characterized in that, The conductive body of the second shunt (2) is the second conductive sheet (21), which passes through the sensing unit. The current sampling structure of the second shunt (2) is the sampling line (22) connected to the second conductive sheet (21). The conductive connection part of the second shunt (2) is the second conductive post (23). The mounting and positioning structure of the second shunt (2) is the second mounting hole (24).

4. The manganese-copper shunt assembly according to claim 2, characterized in that, The sampling point (12) is a plurality of metal contacts set on the first conductive sheet (11). The distance between two adjacent metal contacts is 5-15mm, the diameter of the metal contacts is 1-3mm, and the height of the metal contacts is 0.1-0.3mm.

5. The manganese-copper shunt assembly according to claim 1, characterized in that, The conductive connection part is made of brass. The conductive connection part is a first conductive post (13) and a second conductive post (23). The diameter of the first conductive post (13) and the second conductive post (23) is 5-10mm and the length is 10-20mm. The mounting and positioning structure is a mounting hole with a diameter of 2-4mm and an internal thread inside.

6. The manganese-copper shunt assembly according to claim 1, characterized in that, The insulating substrate (3) is an insulating shell (31), and the receiving part is a mounting groove (32), with a quantity of four. The four mounting grooves (32) are respectively provided for the conductive connection part. The depth of the mounting groove (32) is 5-15mm, and the inner diameter of the mounting groove (32) is 0.1-0.3mm larger than the diameter of the conductive connection part.

7. The manganese-copper shunt assembly according to claim 6, characterized in that, The heat dissipation structure is a heat dissipation fin (33) corresponding to the mounting slot (32). The number of heat dissipation fins (33) is 5-15, the height of the heat dissipation fins (33) is 3-8mm, the spacing between the heat dissipation fins (33) is 1-3mm, and the thickness of the heat dissipation fins (33) is 0.5-1.5mm. The through structure is a clearance hole (34), and there are four of them. The diameter of the clearance hole (34) is 0.5-1mm larger than the diameter of the mounting and positioning structure. The overall positioning structure is a positioning hole (35), which is located in the middle of the insulating shell (31).

8. The manganese-copper shunt assembly according to claim 6, characterized in that, The sensing device is a current transformer (4), and the inner diameter of the current transformer (4) is the same as the width of the conductive body.

9. A smart meter, characterized in that, The invention includes a manganese-copper shunt assembly as described in any one of claims 1-8, wherein the first shunt (1) and the second shunt (2) of the manganese-copper shunt assembly are connected in series in the live wire and neutral wire circuits of the smart meter, respectively, for simultaneously measuring the current of the live wire and the neutral wire, and detecting leakage in the circuit by comparing the current values ​​of the two.

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