Guide rail type monitoring device based on Rogowski coil current sampling

Abstract

The utility model is suitable for the technical field of electrical measurement, and relates to a guide rail type monitoring device based on Rogowski coil current sampling, comprising a data acquisition module comprising a current sampling circuit and a voltage sampling circuit, the current sampling circuit realizes current sampling through an external Rogowski coil, and the voltage sampling circuit realizes voltage sampling through an external Rogowski coil; the voltage sampling circuit achieves voltage sampling through Rogowski coil puncture electricity taking. The data management module is used for power grid parameter measurement, electric energy metering and frozen data storage; the data communication module is used for uploading the monitoring data to a concentrator and transmitting the monitoring data to a state grid master station system so as to monitor the metering box and the charging facility; the data management module is in communication connection with the data acquisition module and the data communication module. The device is simple in structure, convenient to operate, high in accuracy, and capable of metering the whole box and monitoring the running state of the charging facility in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical measurement, and in particular relates to a guide rail type monitoring device based on Rogowski coil current sampling. Background Art

[0002] At present, after the user's electricity meter is installed and used, the accuracy of the meter cannot be grasped in real time due to factors such as usage time, usage environment, and aging of product lines. For multi-meter meter boxes, there is currently a lack of complete box metering equipment, and there are problems such as the inability to monitor the operating status of charging facilities in real time. In addition, due to the narrow installation space of the meter box and the small space between lines, the traditional mutual inductor metering method has disadvantages such as inconvenient installation and narrow measurement range.

[0003] Patent application CN116106603A discloses an energy metering device for a multi-meter box. The device includes: a meter body; an open-type current transformer / Rogowski coil; a power supply; and a communication module. The communication module supports transmit power control, uses a full-power acquisition terminal for uplink communication, and uses micropower for downlink communication with stations. This energy metering device cannot monitor the operating status of the entire box's metering equipment and charging facilities in real time. Furthermore, it utilizes traditional transformer metering, which presents similar differences to existing technologies.

[0004] Therefore, how to provide a device that is easy to operate, highly accurate, can measure the entire box, and can monitor the operating status of charging facilities is an urgent problem to be solved by people in this technical field. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rail-type monitoring device based on Rogowski coil current sampling to solve the problem in the existing technology of lack of whole box metering equipment and the inability to monitor the operating status of charging facilities in real time.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The utility model provides a guide rail type monitoring device based on Rogowski coil current sampling, comprising:

[0008] The data acquisition module includes a current sampling circuit and a voltage sampling circuit. The current sampling circuit implements current sampling through an external Rogowski coil, and the voltage sampling circuit implements voltage sampling through puncture and power collection by the Rogowski coil.

[0009] Data management module, used for grid parameter measurement, energy metering and frozen data storage;

[0010] Data communication module, used to upload monitoring data to the concentrator and transmit it to the State Grid master station system to monitor the meter box and charging facilities;

[0011] The data management module is communicatively connected to the data acquisition module and the data communication module respectively.

[0012] Furthermore, the current sampling circuit includes a TVS tube, a resistor RA9, a resistor RA10, a resistor RA11, a resistor RA12, a resistor RA17, a resistor RA18, a capacitor CA1, a capacitor CA2, a capacitor CA3 and a capacitor CA4, one end of the TVS tube is connected to one end of the resistor RA18 and one end of the resistor RA9, respectively, the other end of the TVS tube is connected to the other end of the resistor RA18, one end of the resistor RA17 and one end of the resistor RA10, respectively, the other end of the resistor RA17 is grounded, the other end of the resistor RA10 is connected to one end of the capacitor CA2 and one end of the resistor RA12, respectively, the other end of the capacitor CA2 is connected to the capacitor CA1 and grounded, the other end of the capacitor CA1 and one end of the resistor RA11 are respectively connected to the other end of the resistor RA9, the other end of the resistor RA11 is connected to one end of the capacitor CA3, the other end of the capacitor CA3 is connected to one end of the capacitor CA4, and the other end of the capacitor CA4 is connected to the other end of the resistor RA12.

[0013] Furthermore, the voltage sampling circuit includes a resistor RA1, a resistor RA2, a resistor RA3, a resistor RA5, a resistor RA7, a resistor RA8, a resistor RA13, a resistor RA14, a capacitor CA5 and a capacitor CA6. The resistor RA1, the resistor RA2, the resistor RA3, the resistor RA8, the resistor RA13 and the resistor RA14 are connected in sequence, the other end of the resistor RA14 is connected to one end of the resistor RA5 and one end of the capacitor CA5, respectively, the other end of the resistor RA5 is connected to one end of the resistor RA7 and grounded, the other end of the RA7 is connected to one end of the capacitor CA6, and the other end of the capacitor CA6 is connected to the other end of the capacitor CA5 and grounded.

[0014] Furthermore, the MCU controller of the data management module is an ARM Cortex-M4 core HC32F460, with 512K FLASH, 192K RAM, the system running frequency is 200MHz, the metering chip signal is RN8302B, supports Rogowski coils, and is configured with or without an integrator through registers.

[0015] Furthermore, the communication mode of the data communication module includes one or more of RS485 communication, CAN communication, Bluetooth communication, and dual-mode communication, and supports DL / T698.45 and DL / T645-2007 protocols.

[0016] Furthermore, the resistance of the resistor RA11 and the resistor RA12 is 1K, and the capacitance of the capacitor CA1 and the capacitor CA2 is 33nF.

[0017] Furthermore, the resistance values ​​of the resistors RA1, RA2, RA3, RA8, RA13, and RA14 are 200K, the resistance values ​​of the resistors RA5 and RA7 are 1K, and the capacitance values ​​of the capacitors CA5 and CA6 are 33nF.

[0018] Compared with the prior art, the guide rail type monitoring device based on Rogowski coil current sampling provided by the utility model has at least the following beneficial effects:

[0019] The existing technology currently lacks whole-box metering equipment for multi-meter meter boxes, resulting in problems such as the inability to monitor the operating status of charging facilities in real time. The utility model has a simple structure, easy operation, and high accuracy. It can monitor the corresponding lines and operating data on the incoming side of the meter box and inside the charging pile and upload them to the State Grid master station management system. It has power metering, data acquisition, and data storage functions. The current sampling uses an external Rogowski coil mutual inductor and supports RS485, Bluetooth, CAN, dual-mode and other communication methods. The external Rogowski coil also supports interchangeable installation. The rail-type monitoring device based on Rogowski coil current sampling realizes real-time monitoring of the electricity consumption data of the meter box and charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the solution of the present invention, a brief introduction will be given below to the figures required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A system structure block diagram of a guide rail type monitoring device based on Rogowski coil current provided by an embodiment of the present utility model;

[0022] Figure 2 A current sampling circuit diagram of a guide rail type monitoring device based on Rogowski coil current provided by an embodiment of the present utility model;

[0023] Figure 3 A voltage sampling circuit diagram of a guide rail type monitoring device based on Rogowski coil current provided by an embodiment of the present utility model;

[0024] Figure 4 This is a system overall communication architecture diagram of a guide rail type monitoring device based on Rogowski coil current provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains; the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention; for example, terms such as “length,” “width,” “up,” “down,” “left,” “right,” “front,” “back,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” indicate directions or positions based on those shown in the accompanying drawings, which are for ease of description only and are not to be construed as limiting this technical solution.

[0026] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. In the specification and claims of the present invention and the above-mentioned drawings, when an element is referred to as being "fixed on" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0027] Furthermore, references to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] The utility model provides a guide rail type monitoring device based on Rogowski coil current sampling, which is applied to the monitoring process of the operating status of multi-meter meter boxes and charging facilities. The guide rail type monitoring device based on Rogowski coil current sampling includes:

[0029] The data acquisition module includes a current sampling circuit and a voltage sampling circuit. The current sampling circuit realizes current sampling through an external Rogowski coil, and the voltage sampling circuit realizes voltage sampling by puncturing the Rogowski coil; the data management module is used for grid parameter measurement, electricity metering and frozen data storage; the data communication module is used to upload monitoring data to the concentrator and transmit it to the State Grid main station system to realize meter box and charging facility monitoring; the data management module is communicated with the data acquisition module and the data communication module respectively.

[0030] The utility model has the advantages of simple structure, convenient operation and high precision, can measure the whole box and can monitor the operating status of the charging facility in real time.

[0031] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] The utility model provides a guide rail monitoring device based on Rogowski coil current sampling, which is used in the monitoring process of the operating status of multi-meter meter boxes and charging facilities. It can monitor the corresponding lines and operating data on the incoming line side of the meter box and inside the charging pile and upload them to the State Grid main station management system. The guide rail monitoring device based on Rogowski coil has electric energy metering, data acquisition, and data storage. The current sampling adopts an external Rogowski coil mutual inductor and supports RS485, Bluetooth, CAN, dual-mode and other communication methods. The test results show that the accuracy of the Rogowski coil is 0.5S. The base meter accuracy of the guide rail monitoring device based on Rogowski coil current sampling is Class C, and the accuracy of the whole machine with Rogowski coil is Class B. It also supports interchangeable installation of Rogowski coils, realizing real-time monitoring of the electricity consumption data of the meter box and the charging pile. Figures 1 to 4 In this embodiment, the guide rail type monitoring device based on Rogowski coil current sampling includes:

[0033] The data acquisition module is used to realize three-phase AC current and voltage sampling, including current sampling circuit and voltage sampling circuit. The current sampling circuit realizes current sampling through an external Rogowski coil. The specification of the Rogowski coil is 500A and it has an integrator function. The output signal of the Rogowski coil is 400mV and the current specification is 4-10(500)A. The voltage sampling circuit realizes voltage sampling by puncturing the Rogowski coil to obtain power. The voltage specification is 3*220V. Current sampling is to convert the large current induced by the Rogowski coil into a 400mV voltage signal, which enters the metering chip through the current sampling circuit to realize current sampling. The current sampling circuit has a TVS tube. When an overvoltage occurs in the circuit, the excess voltage is guided to the ground to prevent it from spreading to other circuit components, thereby protecting the sensitive devices and semiconductor components in the circuit. The back-end sampling A 1K resistor and a 33nF capacitor form a resistance-capacitance circuit for filtering to improve anti-interference ability; voltage sampling is done by puncturing a Rogowski coil to obtain electricity, which is then divided by six 200K resistors, divided by a 1K sampling resistor, and filtered by a 33nF capacitor before entering the metering chip. The multi-resistance voltage division design sampling method can prevent damage from lightning strikes and improve the anti-interference ability of the sampling circuit; the data management module is used to measure multiple grid parameters such as voltage, current, power, power factor and frequency, and to measure electric energy. It can store data such as daily freeze, monthly freeze, settlement day freeze, 15-minute freeze, and minute freeze. By storing meter reading data in the collection record table to form a frozen record, each data item can independently configure the storage depth. When the capacity is insufficient, it can automatically maintain expired historical data to ensure the correct storage of newly collected data. The MCU controller of the data management module is an ARM Cortex-M4 core HC32F460 with 512K FLASH, 192K RAM, the system runs at a main frequency of 200MHz, the metering chip signal is RN8302B, supports Rogowski coils, and is configured with or without an integrator through registers; the data communication module is used to upload monitoring data to the concentrator and transmit it to the State Grid master station system to monitor the meter box and charging facilities. The communication methods of the data communication module include one or more of RS485 communication, CAN communication, Bluetooth communication, and dual-mode communication, and support DL / T698.45 and DL / T645-2007 protocols. Among them, RS485 communication is used to communicate with user electricity meters and DC meters, Bluetooth communication is used to communicate with meter box intelligent devices, CAN communication is used to monitor meter box intelligent locks and charging pile TCU modules, and dual-mode is used to communicate with the concentrator. The rail-type monitoring device based on Rogowski coil current sampling uploads the metering monitoring data, downstream user electricity meters, charging facilities, and meter box intelligent equipment collected data to the concentrator through the dual-mode module and transmits them to the State Grid master station system to monitor the meter box and charging facilities; the data management module is communicated with the data acquisition module and the data communication module respectively.

[0034] Specifically, in this embodiment, the Rogowski coil is made of a material with a relative magnetic permeability of almost 1.0, has extremely excellent frequency response characteristics, excellent linearity, and an ultra-wide measurement range. The output capacity and characteristics of the coil are significantly different from those of traditional current transformers, such as Figure 2 The figure shows the current sampling principle of the Rogowski coil, which is a hollow toroidal coil. The alternating magnetic field generated by the measured conductor induces an AC voltage signal in the coil that is proportional to the primary current. This voltage signal is used to describe the measured current. The Rogowski coil is powered by 5V and has a dedicated integrator to integrate and amplify the coil output signal, restoring an accurate voltage signal of 400mV that can be used by the monitoring device.

[0035] Furthermore, in this embodiment, the current sampling circuit includes a TVS tube, a resistor RA9, a resistor RA10, a resistor RA11, a resistor RA12, a resistor RA17, a resistor RA18, a capacitor CA1, a capacitor CA2, a capacitor CA3 and a capacitor CA4. One end of the TVS tube is connected to one end of the resistor RA18 and one end of the resistor RA9, respectively. The other end of the TVS tube is connected to the other end of the resistor RA18, one end of the resistor RA17 and one end of the resistor RA10, respectively. The other end of the resistor RA17 is grounded. The other end of the resistor RA10 is connected to one end of the capacitor CA2 and one end of the resistor RA12, respectively. The other end of the capacitor CA2 is connected to the capacitor CA1 and grounded. The other end of the capacitor CA1 and one end of the resistor RA11 are respectively connected to the other end of the resistor RA9. The other end of the resistor RA11 is connected to one end of the capacitor CA3. The other end of the capacitor CA3 is connected to one end of the capacitor CA4, and the other end of the capacitor CA4 is connected to the other end of the resistor RA12.

[0036] Specifically, in this embodiment, the resistance of the resistor RA11 and the resistor RA12 is 1K, and the capacitance of the capacitor CA1 and the capacitor CA2 is 33nF.

[0037] Furthermore, in this embodiment, the voltage sampling circuit includes a resistor RA1, a resistor RA2, a resistor RA3, a resistor RA5, a resistor RA7, a resistor RA8, a resistor RA13, a resistor RA14, a capacitor CA5 and a capacitor CA6. The resistor RA1, the resistor RA2, the resistor RA3, the resistor RA8, the resistor RA13 and the resistor RA14 are connected in sequence. The other end of the resistor RA14 is connected to one end of the resistor RA5 and one end of the capacitor CA5, respectively. The other end of the resistor RA5 is connected to one end of the resistor RA7 and grounded. The other end of RA7 is connected to one end of the capacitor CA6. The other end of the capacitor CA6 is connected to the other end of the capacitor CA5 and grounded.

[0038] Specifically, in this embodiment, the resistance values ​​of resistors RA1, RA2, RA3, RA8, RA13, and RA14 are 200K, the resistance values ​​of resistors RA5 and RA7 are 1K, and the capacitance values ​​of capacitors CA5 and CA6 are 33nF.

[0039] Furthermore, in this embodiment, the guide rail monitoring device based on Rogowski coil current sampling supports a security authentication function. The built-in security module of the guide rail table adopts an encryption protection method to perform identity authentication, encrypt and protect the transmitted data, and perform MAC verification to achieve data confidentiality and integrity protection, effectively preventing replay attacks and illegal operations.

[0040] The guide rail monitoring device based on Rogowski coil current sampling described in the above embodiment is compared with the existing technology. In the existing technology, there is currently a lack of whole box metering equipment for multi-meter meter boxes, and there are problems such as the inability to monitor the operating status of charging facilities in real time. The utility model has a simple structure, easy operation, and high accuracy. It can monitor the corresponding lines and operating data on the incoming side of the meter box and inside the charging pile and upload them to the State Grid master station management system. It has the functions of electricity metering, data acquisition, and data storage. The current sampling adopts an external Rogowski coil mutual inductor and supports RS485, Bluetooth, CAN, dual-mode and other communication methods. The external Rogowski coil also supports interchangeable installation. The guide rail monitoring device based on Rogowski coil current sampling realizes real-time monitoring of electricity consumption data of the meter box and the charging pile.

[0041] Obviously, the embodiments described above are only preferred embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the present invention patent.

Claims

1. A guide rail monitoring device based on Rogowski coil current sampling, characterized in that: include: The data acquisition module includes a current sampling circuit and a voltage sampling circuit. The current sampling circuit realizes current sampling through an external Rogowski coil, and the voltage sampling circuit realizes voltage sampling through puncture and power collection by the Rogowski coil. Data management module, used for grid parameter measurement, electric energy metering and frozen data storage; Data communication module, used to upload monitoring data to the concentrator and transmit it to the State Grid master station system to monitor the meter box and charging facilities; The data management module is communicatively connected with the data acquisition module and the data communication module respectively.

2. A guide rail monitoring device based on Rogowski coil current sampling according to claim 1, characterized in that: The current sampling circuit includes a TVS tube, a resistor RA9, a resistor RA10, a resistor RA11, a resistor RA12, a resistor RA17, a resistor RA18, a capacitor CA1, a capacitor CA2, a capacitor CA3 and a capacitor CA4. One end of the TVS tube is connected to one end of the resistor RA18 and one end of the resistor RA9 respectively, the other end of the TVS tube is connected to the other end of the resistor RA18, one end of the resistor RA17 and one end of the resistor RA10 respectively, the other end of the resistor RA17 is grounded, the other end of the resistor RA10 is connected to one end of the capacitor CA2 and one end of the resistor RA12 respectively, the other end of the capacitor CA2 is connected to the capacitor CA1 and grounded, the other end of the capacitor CA1 and one end of the resistor RA11 are connected to the other end of the resistor RA9 respectively, the other end of the resistor RA11 is connected to one end of the capacitor CA3, the other end of the capacitor CA3 is connected to one end of the capacitor CA4, and the other end of the capacitor CA4 is connected to the other end of the resistor RA12.

3. A guide rail monitoring device based on Rogowski coil current sampling according to claim 2, characterized in that: The voltage sampling circuit includes a resistor RA1, a resistor RA2, a resistor RA3, a resistor RA5, a resistor RA7, a resistor RA8, a resistor RA13, a resistor RA14, a capacitor CA5 and a capacitor CA6. The resistor RA1, the resistor RA2, the resistor RA3, the resistor RA8, the resistor RA13 and the resistor RA14 are connected in sequence, the other end of the resistor RA14 is connected to one end of the resistor RA5 and one end of the capacitor CA5 respectively, the other end of the resistor RA5 is connected to one end of the resistor RA7 and grounded, the other end of the resistor RA7 is connected to one end of the capacitor CA6, and the other end of the capacitor CA6 is connected to the other end of the capacitor CA5 and grounded.

4. The guide rail monitoring device based on Rogowski coil current sampling according to claim 1, characterized in that: The MCU controller of the data management module is an ARM Cortex-M4 core HC32F460, with 512K FLASH, 192K RAM, the system running main frequency is 200MHz, the metering chip signal is RN8302B, supports Rogowski coil, and is configured with or without integrator through registers.

5. The guide rail monitoring device based on Rogowski coil current sampling according to claim 1, characterized in that: The communication mode of the data communication module includes one or more of RS485 communication, CAN communication, Bluetooth communication, and dual-mode communication, and supports DL / T698.45 and DL / T645-2007 protocols.

6. The guide rail monitoring device based on Rogowski coil current sampling according to claim 3, characterized in that: The resistance value of the resistor RA11 and the resistor RA12 is 1K, and the capacitance value of the capacitor CA1 and the capacitor CA2 is 33nF.

7. The guide rail monitoring device based on Rogowski coil current sampling according to claim 3, characterized in that: The resistance values ​​of the resistors RA1, RA2, RA3, RA8, RA13 and RA14 are 200K, the resistance values ​​of the resistors RA5 and RA7 are 1K, and the capacitance values ​​of the capacitors CA5 and CA6 are 33nF.

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