A green and low-carbon dual-mode measurement unit calibration device

Abstract

This utility model discloses a green and low-carbon dual-mode measurement unit calibration device, relating to the field of power metering equipment calibration technology. By setting up a device body with multiple calibration stations, this utility model provides a physical basis for batch parallel calibration of measurement units, improving space utilization. Multiple sets of current transformers enable centralized supply and independent distribution of calibration signal sources, replacing the existing whole-machine measurement method. Centralized communication management by the communication control unit enables parallel acquisition and processing of calibration data, thus constructing an independent and dedicated batch calibration platform. This eliminates the reliance on the entire measurement switch as a calibration carrier, greatly simplifying the operation process and significantly improving calibration efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power metering equipment calibration technology, and in particular to a green and low-carbon dual-mode measurement unit calibration device. Background Technology

[0002] Intelligent metering switches are key equipment in low-voltage power distribution systems. Besides basic switching functions, they integrate power metering and data acquisition. Their core metering component—the dual-mode metering unit—is a high-precision metering and communication acquisition device integrating voltage acquisition, current acquisition, and communication functions. It can collect and meter the power consumption of downstream equipment, then upload the data to an upstream concentrator or fusion terminal via power line carrier or wireless communication. After unified processing by the concentrator or fusion terminal, the data is uploaded to the power system master station, achieving unified management and remote acquisition and control of power grid equipment. Because it has both power line carrier and wireless communication networking modes, it is called a dual-mode metering unit, hereinafter referred to as the dual-mode metering unit. While metering switches have metering functions, individual variations in electronic components during manufacturing can prevent accurate metering. Therefore, during production, software correction and calibration of these individual electronic component variations are necessary to ensure the metering accuracy of the dual-mode metering unit.

[0003] Currently, the calibration of dual-mode measurement units (DMUs) commonly employs a method using the entire measurement switch as a carrier. Specifically, the switch body, with the DMU installed, is moved and secured onto a dedicated calibration test bench. This method has significant drawbacks: First, moving the heavy switch body is time-consuming and labor-intensive, resulting in low calibration efficiency. Second, while automated handling with robotic arms can replace manual labor, the initial investment cost is high, and the process of mounting and dismounting the switch body onto the bench remains, limiting the overall energy efficiency improvement. Furthermore, the entire calibration process occupies a large area, consumes a lot of materials (bench), and has low energy utilization efficiency.

[0004] Existing technologies, such as patents CN220584356U (an intelligent circuit breaker calibration device) and CN118897242A (a calibration device for measuring switches), are both based on calibration of the entire switch unit, failing to fundamentally solve the aforementioned problems of low efficiency and high energy consumption. Therefore, there is an urgent need in the field for a device capable of efficiently and in large-scale calibration of dual-mode measuring units, independent of the entire switch unit, to reduce operational intensity, improve production efficiency, and reduce resource consumption. Utility Model Content

[0005] In view of this, the technical problem to be solved by this utility model is: how to achieve efficient, green and low-cost batch calibration of dual-mode measurement units, so as to overcome the problems of low efficiency and waste of resources caused by the reliance on whole-machine calibration in the existing technology.

[0006] On one hand, this utility model provides a green and low-carbon dual-mode measurement unit calibration device, comprising: a device body, on which a signal input section and multiple calibration stations are provided; the signal input section is used to receive external three-phase voltage signals and three-phase current signals; each calibration station is used to install a dual-mode measurement unit to be calibrated; the signal input section is connected to the voltage sampling terminal of the dual-mode measurement unit, thereby inputting the three-phase voltage signals to the voltage sampling terminal of each dual-mode measurement unit respectively; multiple sets of current transformers are disposed inside the device body; the signal input section is connected to the primary side of each set of current transformers respectively; the secondary side of each current transformer is connected to the current sampling terminal of each dual-mode measurement unit respectively; the three-phase current signals flow in from the primary side of the current transformers and generate induced current signals on the secondary side of the current transformers; the induced current signals generated by the multiple sets of current transformers are respectively input to the current sampling terminal of the dual-mode measurement unit. The communication control unit is located on the main body of the device. The communication control unit is connected to the external calibration host computer and multiple dual-mode measurement units, thereby enabling data interaction between the dual-mode measurement units and the external calibration host computer.

[0007] Optionally, the signal input section includes a first interface group for receiving three-phase voltage signals and a second interface group for receiving three-phase current signals. Both the first interface group and the second interface group adopt safety banana socket terminals.

[0008] Optionally, the calibration station interface includes a high-voltage interface for connecting voltage signals and a low-voltage interface for connecting current signals.

[0009] Optionally, the number of current transformers is the same as the number of calibration stations, and each group of current transformers includes three independent magnetic rings corresponding to phases A, B and C respectively.

[0010] Optionally, the communication control unit includes a multi-channel serial port server, which includes a network interface and multiple communication interfaces, the communication interfaces being RS485 interfaces; the multiple RS485 interfaces are connected to different calibration stations via cables, and the network interface is used to connect to an external calibration host computer.

[0011] Optionally, the network interface is an RJ45 Ethernet interface, which is embedded in the housing of the device body.

[0012] Optionally, it also includes a display unit electrically connected to the communication control unit. The display unit is disposed on the panel of the device body and is used to display the values ​​of the three-phase voltage signal and the three-phase current signal input by the signal input unit in real time.

[0013] Optionally, the display unit includes at least three integrated AC voltmeters and AC ammeters.

[0014] Optionally, the number of calibration stations is 8.

[0015] Optionally, the calibration station and the dual-mode measurement unit are pluggable.

[0016] The implementation of this utility model has the following beneficial effects: By setting up a device body with multiple calibration stations, this utility model provides a physical basis for batch parallel calibration measurement units, improving space utilization; by using multiple sets of current transformers, it achieves centralized supply and independent distribution of calibration signal sources, replacing the existing whole-machine measurement technology; through centralized communication management of the communication control unit, it realizes parallel acquisition and processing of calibration data. The synergistic effect of these features constructs an independent and dedicated batch calibration platform, eliminating the reliance on the entire measurement switch as a calibration carrier, thereby greatly simplifying the operation process, significantly improving calibration efficiency, and reducing overall energy consumption and cost due to the simplified process, compact space, and parallel processing. It saves on the manufacturing materials and costs of calibration test benches, reduces the cost of transporting manpower or mechanical equipment during the testing process, and eliminates the energy consumption cost of transporting switches to and from the test bench, thus significantly reducing energy consumption and achieving energy conservation, emission reduction, and green low-carbon effects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection relationship of the green and low-carbon dual-mode measurement unit calibration device according to an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram showing the connection between the three-phase voltage and current standard source, the current transformer interface, and the voltage signal interface.

[0019] Figure 3 This is a circuit diagram of a low-voltage interface.

[0020] Figure 4 This is a circuit diagram of a high-voltage interface.

[0021] Figure 5 This is a schematic diagram of the circuit connection between the three-phase standard source, the current transformer, and the voltage signal.

[0022] Figure 6 This is a circuit diagram showing the connection of a three-phase standard source signal to an internal voltage and current meter.

[0023] Figure 7 This is a circuit wiring diagram of a multi-channel serial port server circuit according to an embodiment of this utility model. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0026] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In this embodiment, as Figure 1 and Figure 2 The green, low-carbon dual-mode measurement unit calibration device shown includes:

[0029] The device body is equipped with a signal input section and multiple calibration stations. The signal input section is used to receive external three-phase voltage signals and three-phase current signals. Each calibration station is used to install a dual-mode measurement unit to be calibrated. The signal input section is connected to the voltage sampling terminal of the dual-mode measurement unit, so that the three-phase voltage signals are respectively input to the voltage sampling terminal of each dual-mode measurement unit.

[0030] Multiple sets of current transformers are installed inside the device body. The signal input section is connected to the primary side of each set of current transformers, and the secondary side of each current transformer is connected to the current sampling terminal of each dual-mode measurement unit. The three-phase current signal flows in from the primary side of the current transformer and generates an induced current signal on the secondary side of the current transformer. The induced current signals generated by the multiple sets of current transformers are respectively input to the current sampling terminal of the dual-mode measurement unit.

[0031] The communication control unit is located on the main body of the device. The communication control unit is connected to the external calibration host computer and multiple dual-mode measurement units, thereby enabling data interaction between the dual-mode measurement units and the external calibration host computer.

[0032] In this embodiment, the interface of the calibration station includes a high-voltage interface J5 for connecting voltage signals, which is connected to the voltage sampling terminal of the dual-mode measurement unit; and a low-voltage interface J6 for connecting current signals, which is connected to the current sampling terminal of the dual-mode measurement unit. By distinguishing the interface of the calibration station into a high-voltage interface and a low-voltage interface, safety specifications are met and internal wiring is optimized.

[0033] Specifically, such as Figure 2 and Figure 4 As shown, Figures 2-4 The diagram illustrates the connection between a three-phase voltage and current standard source and a calibration station. The first interface group includes the A-phase voltage signal source interface (UA), the B-phase voltage signal source interface (UB), the C-phase voltage signal source interface (UC), and the neutral wire interface (N).

[0034] Specifically, UA, UB, UC and N all use M4*32 safety banana socket terminals for connection, which are installed on the back of the device body and connected through wire voltage signal interface J2. Voltage signal interface J2 is connected to slot J3 on the interface adapter PCB of the calibration station, and after passing through the fuse circuits F1, F2 and F3 on the interface adapter PCB, it is connected to the high-voltage interface J5 of the calibration station.

[0035] In this embodiment, as Figure 2 and Figure 3 As shown, the second interface group includes an A-phase current signal source interface (IA), a B-phase current signal source interface (IB), and a C-phase current signal source interface (IC). IA, IB, and IC all use M4*32 safety banana socket terminals for connection and are located on the back of the device body. They are connected to the primary side of multiple sets of current transformers via wires. The secondary side output interface J1 of the current transformer is connected to slot J4 of the interface adapter PCB board of the calibration station. The current signal is connected to the low-voltage interface J6 of the calibration station via the interface adapter PCB board circuit.

[0036] Specifically, the high-voltage interface J5 uses a 2*10-pin, 2.54mm pitch busbar and connects to the voltage sampling terminal of the dual-mode measurement unit, thereby inputting the three-phase voltage signal from the device body to the voltage sampling terminal of the dual-mode measurement unit. The low-voltage interface J6, which connects to the current sampling terminal of the dual-mode measurement unit within the device body, uses a 2*8-pin, 2.54mm pitch busbar and connects to the secondary side of the current transformer within the device body, thereby transmitting the generated induced current to the current sampling terminal of the dual-mode measurement unit.

[0037] In this embodiment, by using a safety-type banana socket terminal as the interface for inputting three-phase current signals and three-phase voltage signals, the safety and reliability of the connection are improved.

[0038] In this embodiment, as Figure 5 As shown, the number of current transformers matches the number of calibration stations, and in this embodiment, there are eight in each group. Each group of current transformers includes three independent magnetic rings corresponding to phases A, B, and C, respectively. By setting up independent three-phase current transformer groups that match the number of calibration stations, it is ensured that each calibrated dual-mode measurement unit obtains an independent, accurate, and non-interfering current signal.

[0039] Specifically, the current transformer adopts the standard metering current transformer corresponding to the dual-mode measurement unit. The current signal from the external three-phase standard signal source is connected through three sets of cables, which pass through the center of the three independent magnetic rings of phase A, phase B, and phase C of each current transformer. The secondary output terminals (J15~J22) of each current transformer are connected to the current input terminals J4 of the eight adapter boards (i.e., interface adapter PCB boards). Each adapter board has an independent current signal output weak current interface J6 for each calibration station. Each weak current interface J6 is connected to the secondary output terminals (J15~J22) of the current transformer through the internal wiring of the adapter board. When the dual-mode measurement unit is installed at the station, its current sampling terminal is connected to the current signal weak current interface J6.

[0040] In this embodiment, as Figure 5 and Figure 7 As shown, the device body has 8 sets of calibration stations inside. Correspondingly, the adapter plate on the device body has 8 sets of independent plug-in ports (i.e., high-voltage interface J5 and low-voltage interface J6). These plug-in ports are used to independently install the dual-mode measurement unit, so that the calibration station and the dual-mode measurement unit are pluggable and can be quickly disassembled and assembled.

[0041] In this embodiment, as Figure 7 As shown, the communication control unit includes a multi-channel serial port server. By using a multi-channel serial port server to centrally manage communication, the overall structure is simplified and communication stability and management convenience are improved.

[0042] Specifically, the multi-channel serial port server includes a network interface for communication connections and multiple RS485 interfaces (such as...). Figure 7 (RS485-1 to RS485-8); multiple RS485 interfaces are connected to the communication ports of each calibration station (i.e., PORT-1 to PORT-8) via cables, and the network interface RJ45 is used to connect to the external calibration host computer.

[0043] Specifically, the RS485 communication interface adopts an aviation socket design, embedded in the side or top wall of the device body. One end of the RS485 communication interface is an aviation plug, and the other end is an 8-pin Phoenix terminal connector plug (e.g., ...). Figure 7 (PORT-1~PORT-8 in the model), the plug is inserted into the communication interface of the dual-mode measurement unit being calibrated to realize communication between the RS485 serial server and the dual-mode measurement unit being calibrated.

[0044] In this embodiment, the network interface is an RJ45 Ethernet interface, which is embedded in the housing of the device body.

[0045] In this embodiment, as Figure 2 As shown, it also includes a display unit, which is disposed on the panel of the device body and is used to display the values ​​of the three-phase voltage signal and the three-phase current signal connected to the signal input unit in real time.

[0046] In this embodiment, as Figure 2 and Figure 6 As shown, the display unit includes an integrated AC voltmeter and an AC ammeter.

[0047] In this embodiment, the AC voltmeter and AC ammeter are selected as voltmeters and ammeters that can measure both voltage and current simultaneously.

[0048] Specifically, the main body of the device has three sets of display sections on its panel, which are used to display the voltage and current signals of phase A, phase B and phase C respectively.

[0049] In this embodiment, each slot includes an interface adapter PCB board. When the three-phase standard source (i.e., the three-phase voltage and current standard source, including three-phase voltage signals and three-phase current signals) is connected to the signal input section, the external calibration host computer connects to the communication terminals of the eight dual-mode measurement units being calibrated through a multi-channel serial port server. At the same time, the external calibration host computer communicates with the three-phase standard source through the multi-channel serial port server. After entering the calibration program, the external calibration host computer controls the three-phase standard source to turn on and starts outputting the three-phase voltage signals and three-phase current signals required for calibration. The three-phase current signals are connected via wires to the primary side of the current transformer (one side of the independent magnetic rings for phases A, B, and C). The induced current signals generated on the secondary side of the current transformer (the other side of the independent magnetic rings for phases A, B, and C) are connected to the interface adapter PCB board corresponding to each slot. The interface adapter PCB board is equipped with a current signal protection TVS diode (Transient Voltage Suppressor) to prevent high voltage damage to the inserted dual-mode measurement unit circuit caused by an open circuit in the secondary current signal of the current transformer when the dual-mode measurement unit under test is not inserted. The interface adapter PCB board connects the current signals to the low-voltage interface J6 of the dual-mode measurement unit in each slot, inputting the signals to the current sampling terminals of the eight dual-mode measurement units, and then flowing through the eight calibrated dual-mode measurement units. Simultaneously, the three-phase voltage signals are connected to voltage signal interfaces (J7~J14) via wires. These interfaces (J7~J14) are connected to the J3 interface on each interface adapter PCB. A three-phase voltage signal fuse is designed on the interface adapter PCB to prevent damage to one dual-mode measurement unit from affecting the calibration of other dual-mode measurement units. The voltage signals are input through the J3 interface of the interface adapter PCB to the high-voltage interfaces J5 of the eight dual-mode measurement units, and then flow into the eight dual-mode measurement units being calibrated. At this point, the eight dual-mode measurement units acquire the corresponding current and voltage signal values. The multi-channel serial port server simultaneously and separately communicates with each of the eight dual-mode measurement units being calibrated, and sends the acquired three-phase voltage and induced current signals to the external calibration host computer. The external calibration host computer compares the three-phase voltage and induced current signals acquired by each dual-mode measurement unit with the three-phase voltage and current signals output by the three-phase standard source to obtain the deviation value. Then, the external calibration host computer generates correction parameters and sends the correction parameters to the eight dual-mode measurement units being calibrated through the multi-channel serial port server. After obtaining the correction values, the dual-mode measurement units correct the acquired three-phase voltage and induced current signal values ​​to obtain accurate three-phase voltage and induced current signal values, thus completing the voltage and current calibration work.

[0050] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A green, low-carbon dual-mode measurement unit calibration device, characterized in that, include: The device body is provided with a signal input section and multiple calibration stations. The signal input section is used to receive external three-phase voltage signals and three-phase current signals. Each calibration station is used to install a dual-mode measurement unit to be calibrated. The signal input section is connected to the voltage sampling terminal of the dual-mode measurement unit, so that the three-phase voltage signals are respectively input to the voltage sampling terminal of each dual-mode measurement unit. Multiple sets of current transformers are disposed inside the device body. The signal input section is connected to the primary side of each set of current transformers, and the secondary side of each current transformer is connected to the current sampling terminal of each dual-mode measurement unit. The three-phase current signal flows in from the primary side of the current transformer and generates an induced current signal on the secondary side of the current transformer. The induced current signals generated by the multiple sets of current transformers are respectively input to the current sampling terminal of the dual-mode measurement unit. A communication control unit is disposed on the device body. The communication control unit is communicatively connected to an external calibration host computer and multiple dual-mode measurement units, thereby enabling data interaction between the dual-mode measurement units and the external calibration host computer.

2. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The signal input section includes a first interface group for receiving three-phase voltage signals and a second interface group for receiving three-phase current signals. Both the first interface group and the second interface group use safety banana plug terminals.

3. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The calibration station's interface includes a high-voltage interface for connecting voltage signals and a low-voltage interface for connecting current signals.

4. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The number of current transformers is the same as the number of calibration stations, and each group of current transformers includes three independent magnetic rings corresponding to phase A, phase B and phase C respectively.

5. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The communication control unit includes a multi-channel serial port server, which includes a network interface and multiple communication interfaces, the communication interfaces being RS485 interfaces; the multiple RS485 interfaces are respectively connected to different calibration workstations via cables, and the network interface is used to connect to the external calibration host computer.

6. The green and low-carbon dual-mode measurement unit calibration device according to claim 5, characterized in that, The network interface is an RJ45 Ethernet interface, which is embedded in the housing of the device body.

7. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, It also includes a display unit electrically connected to the communication control unit. The display unit is disposed on the panel of the device body and is used to display the values ​​of the three-phase voltage signal and the three-phase current signal connected to the signal input unit in real time.

8. The green and low-carbon dual-mode measurement unit calibration device according to claim 7, characterized in that, The display unit includes at least three integrated AC voltmeters and AC ammeters.

9. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The number of calibration stations is 8.

10. The green and low-carbon dual-mode measurement unit calibration device according to claim 1, characterized in that, The calibration station and the dual-mode measurement unit are connected in a pluggable manner.

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