Current acquisition device based on current transformer, power metering method and system

Abstract

The present invention relates to the technical field of distribution power grids, and provides a current acquisition device based on a current transformer, a power metering method and a system. The current acquisition device includes: a current transformer for collecting current signals of a power conductor; a wireless transceiver module for acquiring the current signals collected by the current transformer, processing the acquired current signals to obtain current value data, and sending the current value data according to a received wireless data request command; a wireless power taking module for taking power by using the magnetic field induction generated by the load current of the power conductor to provide electric energy required for the operation of the wireless transceiver module. In the current acquisition device of the present invention, the current data is wirelessly transmitted through the wireless transceiver module, and the wireless transceiver module is powered by the wireless power taking module, so that the stability is better. The power metering method and system of the present invention realize wireless data interaction and synchronization through a convergence module, improving the reliability of power metering.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution power grids, and specifically relates to a current acquisition device based on a current transformer, a power metering method, and a power metering system. Background Art

[0002] With the development of the construction of smart grids towards ultra-high voltage, automation, and intelligence, effective monitoring of the operating status of power equipment has received increasing attention. An important aspect is power metering. On the one hand, the demand for electricity is continuously increasing, and the demand for electricity metering equipment has shown an explosive growth. On the other hand, the power system urgently needs to provide accurate services relying on information technology means.

[0003] Currently, in medium and low voltage distribution power grids, voltage transformers and current transformers are mostly connected to the power grid respectively to achieve power metering. However, most of the sensor devices of transformers use wired connection methods. Installation and commissioning require a large amount of human resources, and time and efficiency cannot be guaranteed. Moreover, wired transmission leads to complex wiring, which is not conducive to refined management.

[0004] Voltage transformers and current transformers generally use line power supply, solar energy or battery power supply. The power supply is limited by the magnitude of the line load current and weather conditions. The unstable power supply affects the timeliness of data acquisition and the reliability of power metering. Summary of the Invention

[0005] The object of the present invention is to provide a current acquisition device based on a current transformer, a power metering method, and a system to at least solve the above problems.

[0006] To achieve the above object, in a first aspect of the present invention, a current acquisition device based on a current transformer is provided, including:

[0007] A current transformer for collecting current signals of power conductors;

[0008] A wireless transceiver module for obtaining the current signals collected by the current transformer, processing the obtained current signals to obtain current value data, and sending the current value data according to the received wireless data request command;

[0009] A wireless power acquisition module for obtaining power by magnetic field induction generated by the load current of the power conductor to provide the electric energy required for the operation of the wireless transceiver module.

[0010] Optionally, the wireless transceiver module includes:

[0011] A current sampling circuit for obtaining the current signals collected by the current transformer;

[0012] A processor for processing the acquired current signal to obtain current value data;

[0013] A wireless transmission unit for receiving the wireless data request command and wirelessly sending the current value data provided by the processor in response to the wireless data request command.

[0014] Optionally, the wireless transceiver module further includes: a memory and a synchronizer;

[0015] The memory and the synchronizer are connected to the processor;

[0016] The memory is used to store the current value data processed by the processor;

[0017] The processor is further configured to generate a time synchronization instruction according to the target time of the wireless data request command, and extract the current value data from the memory;

[0018] The synchronizer is used to perform time synchronization on the current value data extracted by the processor from the memory according to the time synchronization instruction, so as to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command.

[0019] Optionally, the wireless power taking module includes two semi-circular sub-modules;

[0020] A plurality of sets of induction coils are arranged along the semi-circular sub-module, and the plurality of sets of induction coils are connected in parallel;

[0021] The induction coils of the two semi-circular sub-modules are connected in parallel through an extension joint.

[0022] Optionally, the two semi-circular sub-modules are assembled through circular fixing holes and semi-circular fixing holes.

[0023] The current acquisition device based on a current transformer of the present invention wirelessly transmits the current value data collected by the current transformer through a wireless transceiver module, and the wireless power taking module uses magnetic field induction to take power to supply power to the wireless transceiver module, with better stability. There is no need to separately configure a power supply or a power supply line for the current acquisition device, and it is not affected by the external environment, and can ensure the timeliness and stability of data acquisition.

[0024] A second aspect of the present invention provides a power metering method, the method includes:

[0025] Using the above-mentioned current acquisition device based on a current transformer to collect the current value data of the power conductor and wirelessly send the current value data;

[0026] Receiving the current value data through an aggregation module and transmitting the received current value data to the intelligent terminal of the gateway node in a wired transmission manner;

[0027] Collect the voltage value data of the gateway node through the intelligent terminal, and perform power synthesis on the received current value data and the collected voltage value data to measure the electrical parameters.

[0028] Furthermore, the method further includes:

[0029] The aggregation module sends a wireless data request command corresponding to the time according to the voltage value data collected by the intelligent terminal to the current acquisition device;

[0030] The current acquisition device generates a time synchronization instruction according to the target time of the wireless data request command, and synchronizes the current value data provided in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction.

[0031] The third aspect of the present invention provides an electrical measurement system, and the system includes:

[0032] A current acquisition device based on a current transformer, which is used to collect the current value data of the power conductor and wirelessly send the current value data;

[0033] An aggregation module, wirelessly connected to the current acquisition device, for receiving the current value data;

[0034] An intelligent terminal, located at the gateway node, for collecting the voltage value data of the gateway node;

[0035] The aggregation module is wired to the intelligent terminal, and the aggregation module is further used to transmit the received current value data to the intelligent terminal, and the intelligent terminal is further used to perform power synthesis on the received current value data and the collected voltage value data to measure electrical parameters.

[0036] Furthermore, the aggregation module is further used to send a wireless data request command corresponding to the time according to the voltage value data collected by the intelligent terminal to the current acquisition device;

[0037] The current acquisition device is further used to generate a time synchronization instruction according to the target time of the wireless data request command, and synchronize the current value data provided in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction.

[0038] Furthermore, the current acquisition device includes:

[0039] A current transformer, used to collect the current signal of the power conductor;

[0040] A wireless transceiver module, configured to obtain the current signal collected by a current transformer, process the obtained current signal to obtain current value data, and send the current value data according to the received wireless data request command;

[0041] A wireless power acquisition module, configured to acquire power by magnetic field induction generated by the load current of a power wire, and provide the electric energy required for the operation of the wireless transceiver module.

[0042] Further, the wireless transceiver module includes:

[0043] A current sampling circuit, configured to obtain the current signal collected by the current transformer;

[0044] A processor, configured to process the obtained current signal to obtain current value data;

[0045] A wireless transmission unit, configured to receive the wireless data request command sent by an aggregation module, and send the current value data provided by the processor in response to the wireless data request command to the aggregation module.

[0046] Further, the wireless transceiver module further includes: a memory and a synchronizer;

[0047] The memory and the synchronizer are connected to the processor;

[0048] The memory is configured to store the current value data processed by the processor;

[0049] The processor is further configured to generate a time synchronization instruction according to the target time of the wireless data request command;

[0050] The synchronizer is configured to perform time synchronization on the current value data extracted by the processor from the memory according to the time synchronization instruction, so as to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command. [[ID=3l]]

[0051] The power metering method and system of the present invention, based on a current acquisition device of a current transformer, wirelessly transmits the current value data collected by the current transformer through a wireless transceiver module, and the wireless power acquisition module uses magnetic field induction to acquire power and supply power to the wireless transceiver module, with better stability, without the need to separately configure a power supply or a power supply line for the current acquisition device, not affected by the external environment, and capable of ensuring the timeliness and stability of data acquisition.

[0052] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the accompanying drawings:

[0054] Figure 1 is a block diagram of a current acquisition device based on a current transformer provided by an embodiment of the present invention;

[0055] Figure 2 is a schematic structural diagram of a wireless power acquisition module provided by an embodiment of the present invention;

[0056] Figure 3 is a flowchart of a power metering method provided by an embodiment of the present invention;

[0057] Figure 4 is a block diagram of a power metering system provided by an embodiment of the present invention. Specific Embodiments

[0058] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0059] Figure 1 is a block diagram of a current acquisition device based on a current transformer provided by an embodiment of the present invention. As Figure 1 shown, this embodiment provides a current acquisition device based on a current transformer. The device includes a current transformer, a wireless transceiver module, and a wireless power acquisition module. The current transformer is used to collect the current signal of the power conductor. The wireless transceiver module is used to obtain the current signal collected by the current transformer, process the obtained current signal to obtain current value data, and send the current value data according to the received wireless data request command. The wireless power acquisition module is used to obtain power by magnetic induction generated by the load current of the power conductor and provide the electric energy required for the operation of the wireless transceiver module.

[0060] The wireless transceiver module includes a current sampling circuit, a processor, a wireless transmission unit, a memory, and a synchronizer. The current sampling circuit is connected to a current transformer and is used to obtain the current signal collected by the current transformer. The processor is connected to the current sampling circuit and is used to process the obtained current signal to obtain current value data. The wireless transmission unit is connected to the processor and is used to receive a wireless data request command, transmit the received wireless data request command to the processor, and wirelessly send the current value data provided by the processor in response to the wireless data request command. The wireless power module is connected to the processor and the wireless transmission unit and provides the electrical energy required for the operation of the processor and the wireless transmission unit. The wireless transmission unit uses two-way wireless transceiver, constructs an adaptive low-power radio frequency transmission algorithm, and synthesizes mechanisms such as ASK, FSK, or POLLING to ensure the reliability of wireless data transmission.

[0061] The memory and the synchronizer are connected to the processor. The memory is used to store the current value data processed by the processor, and the synchronizer is used to achieve time synchronization. The processor generates a time synchronization instruction according to the target time of the wireless data request command, and the synchronizer synchronizes the time of the current value data extracted by the processor from the memory according to the time synchronization instruction, so as to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command, that is, the acquisition (processing) time corresponding to the current value data of the processor's response to the wireless data request command is consistent with the target time of the wireless data request command.

[0062] Figure 2 It is a schematic structural diagram of the wireless power module provided by an embodiment of the present invention. As Figure 2 shown, the wireless power module provided in this embodiment is a split structure, including two semi-circular sub-modules. A plurality of groups of induction coils are arranged along the semi-circular sub-modules, and the plurality of groups of induction coils are connected in parallel. The induction coils between the two semi-circular sub-modules are connected in parallel through an extension joint. Referring to Figure 2 , 4 groups of induction coils are arranged along the circumferential direction of the semi-circular sub-module. The number of turns and the area of the induction coils are designed according to the voltage required by the wireless transceiver module. According to the principle of electromagnetic induction, the number of turns and the area of the coil are:

[0063]

[0064] where N is the number of turns of the coil, B is the magnetic field strength, and S is the area of the coil.

[0065] Combined with the power requirements of the wireless transceiver module, the wireless power acquisition module adopts a layout method of surrounding multiple groups of coils. By using the method of parallel connection of multiple induction coils and parallel connection of coils between sub-modules through expansion joints, it is possible to obtain the energy of the other two wires while obtaining the energy of this wire (in three-phase three-wire AC power transmission, there are three wires), thereby increasing the supply current.

[0066] In this embodiment, the two semi-circular sub-modules are assembled through fixing holes, enabling the addition of a wireless power acquisition module without powering off existing equipment (such as current transformers), which facilitates on-site installation and disassembly. The fixing holes include circular fixing holes and semi-circular fixing holes. Four circular fixing holes are respectively arranged in the four quadrants of the semi-circular sub-module, and two semi-circular fixing holes are symmetrically arranged on the edge of the semi-circular sub-module. The wireless power acquisition module adopts a modular combination method, which can effectively collect electric energy in a limited space, improve the power supply capacity, enhance the on-site operation convenience, and simplify the on-site wiring.

[0067] For the current acquisition device based on a current transformer in this embodiment, the wireless transceiver module wirelessly transmits the current value data collected by the current transformer. The wireless power acquisition module uses magnetic field induction to obtain power and supply power to the wireless transceiver module, with better stability. There is no need to separately configure a power supply or power supply line for the current acquisition device, and it is not affected by the external environment, ensuring the timeliness and stability of data acquisition.

[0068] Figure 3 It is a flowchart of a power metering method provided by an embodiment of the present invention. As Figure 3 shown, this embodiment provides a power metering method, and the method includes:

[0069] S1. Using the above-mentioned current acquisition device based on a current transformer, collect the current value data of the power wire and wirelessly transmit the current value data;

[0070] S2. Receive the current value data through the aggregation module and transmit the received current value data to the intelligent terminal of the gateway node in a wired transmission manner;

[0071] S3. Collect the voltage value data of the gateway node through the intelligent terminal, and perform power synthesis on the received current value data and the collected voltage value data to perform power parameter metering.

[0072] In an alternative embodiment, the current acquisition device is installed on the power wire (i.e., the end node), the aggregation module and the intelligent terminal are located on the gateway node side, the aggregation module is connected to the intelligent terminal in a wired manner, and the aggregation module is connected to the current acquisition device in a wireless manner. The aggregation module sends a wireless data request command corresponding to the time when the intelligent terminal acquires the voltage value data to the current acquisition device according to the time, and starts the synchronization algorithm. The current acquisition device generates a time synchronization instruction according to the target time of the wireless data request command (the time when the intelligent terminal acquires the voltage value data), and synchronizes the current value data in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction. The aggregation module realizes the precise synchronization of the current value data acquired by the current acquisition device and the voltage value data acquired by the intelligent terminal according to the synchronization algorithm.

[0073] The power metering method of this embodiment is based on the current acquisition device on the end node side and the intelligent terminal on the gateway side, and realizes the metering data interaction and data synchronization between the current acquisition device and the intelligent terminal through the aggregation module, ensuring the real-time nature of the data and improving the reliability of power metering.

[0074] Figure 4 It is a block diagram of a power metering system provided by an embodiment of the present invention. As Figure 4 shown, this embodiment provides a power metering system, and the system includes: a current acquisition device based on a current transformer, an aggregation module, and an intelligent terminal. The current acquisition device is installed on the power wire and is used to acquire the current value data of the power wire and send the current value data in a wireless manner. The aggregation module is wirelessly connected to the current acquisition device and is used to receive the current value data acquired by the current acquisition device. The aggregation module and the intelligent terminal are located on the gateway node side, and the intelligent terminal is used to acquire the voltage value data of the gateway node. The aggregation module is connected to the intelligent terminal in a wired manner, and the aggregation module transmits the wirelessly received current value data to the intelligent terminal in a wired manner. The intelligent terminal (metering unit) performs power synthesis on the received current value data and the acquired voltage value data to perform power parameter metering.

[0075] In an embodiment, the aggregation module sends a wireless data request command corresponding to the time when the intelligent terminal (voltage acquisition unit) acquires the voltage value data to the current acquisition device according to the time, starts the synchronization algorithm, and the current acquisition device generates a time synchronization instruction according to the target time of the wireless data request command (the time when the intelligent terminal acquires the voltage value data), and synchronizes the current value data in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction. The aggregation module realizes the precise synchronization of the current value data acquired by the current acquisition device and the voltage value data acquired by the intelligent terminal according to the synchronization algorithm.

[0076] The convergence module uses a synchronization algorithm to calculate the delays of all links for the data received from each branch, perform time correction, correct the time error for each point, and ensure the synchronization accuracy of the data. The synchronization algorithm is set as follows: the time of the first downlink message sent by the intelligent terminal to the current acquisition device is T1, the start time of reception by the current acquisition device is T2, the time of the first uplink message sent by the current acquisition device to the intelligent terminal is T3, and the time when the intelligent terminal receives the time unit sent by the current acquisition device is T4.

[0077] Based on the above settings, the relationship between T2 and T1 is:

[0078] T2 = T1 + t0 + t DL

[0079] where t DL is the delay of the first downlink message, and t0 is the time deviation between the current acquisition device and the intelligent terminal.

[0080] The relationship between T4 and T3 is:

[0081] T4 = T3 - t0 + t UL

[0082] where t UL is the delay of the first uplink message.

[0083] Theoretically, the delay of the first uplink message is equal to the delay of the first downlink message, that is:

[0084] t UL = t DL

[0085] According to the above four times (the time T1 of the first downlink message, the start time T2 of reception by the current acquisition device, the time T3 of the first uplink message, the time T4 when the intelligent terminal receives the time unit sent by the current acquisition device), calculate the time deviation between the current acquisition device and the intelligent terminal:

[0086] t0 = (T2 - T1 - T4 + T3) / 2

[0087] The convergence module completes one-time time synchronization between the intelligent terminal and the current acquisition device according to the time deviation between the current acquisition device and the intelligent terminal within a certain period.

[0088] Refer to Figure 1, the current acquisition device includes a current transformer, a wireless transceiver module, and a wireless power acquisition module. The current transformer is used to acquire the current signal of the power conductor. The wireless transceiver module is used to obtain the current signal acquired by the current transformer, process the obtained current signal to obtain current value data, and send the current value data according to the received wireless data request command. The wireless power acquisition module is used to generate power through magnetic field induction generated by the load current of the power conductor to provide the electrical energy required for the operation of the wireless transceiver module.

[0089] The wireless transceiver module includes a current sampling circuit, a processor, a wireless transmission unit, a memory, and a synchronizer. The current sampling circuit is connected to the current transformer and is used to obtain the current signal acquired by the current transformer. The processor is connected to the current sampling circuit and is used to process the obtained current signal to obtain current value data. The wireless transmission unit is connected to the processor and is used to receive the wireless data request command sent by the aggregation module, transmit the wireless data request command to the processor, and send the current value data provided by the processor in response to the wireless control command to the aggregation module. The wireless power acquisition module is connected to the processor and the wireless transmission unit to provide the electrical energy required for the operation of the processor and the wireless transmission unit. A two-way wireless transceiver mode is adopted between the wireless transmission unit and the aggregation module, and a radio frequency transmission mechanism combining ASK, FSK, or POLLING is adopted to ensure the reliability of wireless data transmission.

[0090] The memory and the synchronizer are connected to the processor. The memory is used to store the current value data processed by the processor, and the synchronizer is used to achieve time synchronization. The processor generates a time synchronization instruction according to the target time of the wireless data request command, and the target time of the wireless data request command is the time corresponding to the voltage value data collected by the intelligent terminal. The synchronizer synchronizes the time of the current value data extracted by the processor from the memory according to the time synchronization instruction to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command.

[0091] In the power metering system of this embodiment, based on the current acquisition device of the current transformer, the wireless transceiver module wirelessly transmits the current value data acquired by the current transformer. The wireless power acquisition module generates power through magnetic field induction to supply power to the wireless transceiver module, with better stability. There is no need to separately configure a power supply or power supply line for the current acquisition device, and it is not affected by the external environment, which can ensure the timeliness and stability of data acquisition.

[0092] The power metering system of the present invention, based on the current acquisition device on the terminal node side and the intelligent terminal on the gateway side, adds an aggregation module to realize the wireless interaction and data synchronization of metering data between the current acquisition device and the intelligent terminal, ensuring the real-time nature of the data and improving the reliability of power metering.

[0093] An embodiment of the present invention also provides a machine-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed, the above-mentioned power metering method is implemented.

[0094] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] The present application is described with reference to the flowcharts and / or block diagrams of methods, systems, and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0096] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific implementation manners of the present invention, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A current acquisition device based on a current transformer, characterized in that, Comprising: A current transformer for collecting current signals of a power conductor; A wireless transceiver module for obtaining the current signals collected by the current transformer, processing the obtained current signals to obtain current value data, and sending the current value data according to a received wireless data request command; A wireless power taking module for taking power by magnetic field induction generated by the load current of the power conductor to provide electrical energy required for the operation of the wireless transceiver module; The wireless power taking module is of a split structure, including two semi-circular sub-modules. A plurality of groups of induction coils are arranged along the semi-circular sub-modules. The plurality of groups of induction coils are connected in parallel. The induction coils between the two semi-circular sub-modules are connected in parallel through an extension joint. The two semi-circular sub-modules are assembled through fixing holes.

2. The current acquisition device based on a current transformer according to claim 1, characterized in that, The wireless transceiver module includes: A current sampling circuit for obtaining the current signals collected by the current transformer; A processor for processing the obtained current signals to obtain current value data; A wireless transmission unit for receiving the wireless data request command and wirelessly sending the current value data provided by the processor in response to the wireless data request command.

3. The current acquisition device based on a current transformer according to claim 2, wherein, The wireless transceiver module further includes: a memory and a synchronizer; The memory and the synchronizer are connected to the processor; The memory is used for storing the current value data processed by the processor; The processor is further used for generating a time synchronization instruction according to the target time of the wireless data request command and extracting the current value data from the memory; The synchronizer is used for synchronizing the current value data extracted by the processor from the memory according to the time synchronization instruction to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command.

4. A power metering method, characterized in that, The method includes: Using the current acquisition device based on a current transformer according to claim 1 to collect current value data of a power conductor and wirelessly send the current value data; Receiving the current value data through an aggregation module and transmitting the received current value data to an intelligent terminal of a gateway node in a wired transmission manner; Collecting voltage value data of the gateway node through the intelligent terminal, and performing power synthesis on the received current value data and the collected voltage value data for power parameter measurement.

5. The power metering method according to claim 4, characterized in that, The method further includes: The aggregation module sends a wireless data request command corresponding to the time according to the time when the intelligent terminal collects voltage value data to the current acquisition device; The current acquisition device generates a time synchronization instruction according to the target time of the wireless data request command, and synchronizes the current value data provided in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction; the target time of the wireless data request command is the time corresponding to the voltage value data collected by the intelligent terminal.

6. A power metering system, characterized in that, The system includes: The current acquisition device based on a current transformer according to claim 1, which is used for collecting current value data of a power conductor and wirelessly sending the current value data; An aggregation module wirelessly connected to the current acquisition device for receiving the current value data; An intelligent terminal, located at the gateway node, is used to collect voltage value data of the gateway node; The aggregation module is connected to the intelligent terminal in a wired manner. The aggregation module is further used to transmit the received current value data to the intelligent terminal, and the intelligent terminal is further used to perform power synthesis on the received current value data and the collected voltage value data for power parameter measurement.

7. The power metering system according to claim 6, wherein The aggregation module is further used to send a wireless data request command corresponding to the time when the intelligent terminal collects voltage value data to the current acquisition device; The current acquisition device is further used to generate a time synchronization instruction according to the target time of the wireless data request command, and synchronize the current value data provided in response to the wireless data request command with the target time of the wireless data request command according to the time synchronization instruction; The target time of the wireless data request command is the time corresponding to the voltage value data collected by the intelligent terminal.

8. The power metering system according to claim 6, characterized in that, The wireless transceiver module includes: A current sampling circuit for obtaining the current signal collected by the current transformer; A processor for processing the obtained current signal to obtain current value data; A wireless transmission unit for receiving the wireless data request command sent by the aggregation module and sending the current value data provided by the processor in response to the wireless data request command to the aggregation module.

9. The power metering system according to claim 8, characterized in that, The wireless transceiver module further includes: a memory and a synchronizer; The memory and the synchronizer are connected to the processor; The memory is used to store the current value data processed by the processor; The processor is further used to generate a time synchronization instruction according to the target time of the wireless data request command, and extract the current value data from the memory; the target time of the wireless data request command is the time corresponding to the voltage value data collected by the intelligent terminal; The synchronizer is used to perform time synchronization on the current value data extracted by the processor from the memory according to the time synchronization instruction to ensure that the current value data provided by the processor in response to the wireless data request command matches the target time of the wireless data request command.

Images