Monitoring data acquisition and remote communication device for various transformers

Abstract

The utility model belongs to the field of equipment monitoring in the power industry, and particularly relates to a monitoring data acquisition and remote communication device for various transformers. Comprising a sensor unit, a data acquisition terminal, an adapter unit, a digital quantity input unit, a digital quantity output unit and a background system, the data acquisition terminal is respectively connected with the adapter unit and the background system through the Ethernet, and the adapter unit, the digital quantity input unit and the digital quantity output unit are sequentially connected through connectors. According to the utility model, modular design is adopted, interface configuration can be conveniently expanded or changed according to monitoring requirements, and the applicability and expandability of the device are improved.

Description

Technical Field

[0001] The utility model belongs to the field of equipment monitoring in the power industry, specifically a device for collecting monitoring data and remote communication of various transformers. The remote communication adopts the IEC61850 protocol and is mainly used for collecting transformer monitoring data in the power industry. Background Art

[0002] With the ever-increasing demand for electricity in modern society, the stable operation of power systems is crucial. As a crucial component of power systems, monitoring the operating status of transformers is crucial for ensuring their safe and stable operation. Furthermore, with the increasing automation of power systems, the demand for data acquisition and communication is also increasing. IEC61850 is a communication protocol widely used in power system automation, enabling efficient and reliable data exchange between devices.

[0003] However, existing transformer monitoring data acquisition devices based on IEC61850 communication usually only have a single data acquisition function and cannot meet the power industry's needs for the diversity and real-time nature of transformer monitoring data. For example, some devices may only support specific types of sensors or communication protocols, limiting their scope of application. In addition, existing data acquisition devices also have insufficient flexibility in terms of interface configuration and data processing. For example, the interface configuration of some devices is fixed and cannot be expanded or changed as needed; some devices have weak data processing capabilities and cannot handle large or complex data. Therefore, a new data acquisition device is needed that can meet the power industry's needs for the diversity and real-time nature of transformer monitoring data, while also having flexible interface configuration and powerful data processing capabilities. Utility Model Content

[0004] This utility model proposes a device for data collection and remote communication for monitoring various transformers. The device uses an embedded ARM core board as its development platform, integrating IEC61850 communication, Ethernet interface, RS485 interface, RS232 interface, analog input acquisition, binary input acquisition, and binary output control. It features flexible interface configuration and the ability to collect and process data locally.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0006] A device for data collection and remote communication for monitoring various transformers, comprising: a sensor unit, a data acquisition terminal, an adapter unit, a digital input unit, a digital output unit, and a background system, wherein:

[0007] The sensor unit is arranged on the transformer body and connected to the data acquisition terminal through a shielded cable. The data acquisition terminal is connected to the adapter unit and the background system respectively through Ethernet. The adapter unit, digital input unit and digital output unit are connected in sequence through connectors.

[0008] The data acquisition terminal includes:

[0009] The CPU unit and the digital-to-analog conversion unit, the first signal processing unit, the second signal processing unit, the third signal processing unit, the power supply unit, the LED indication unit, the USB unit, the external storage unit and the second Ethernet communication unit respectively connected thereto, also include a first signal isolation unit and an analog quantity acquisition unit connected in sequence with the digital-to-analog conversion unit, also include a second signal isolation unit and an RS485 acquisition unit connected in sequence with the first signal processing unit, also include an RS232 debugging unit connected to the second signal processing unit and a first Ethernet communication unit connected to the third signal processing unit, and the first Ethernet communication unit is connected to the adapter unit.

[0010] The analog quantity acquisition unit comprises:

[0011] The positive input terminal IN1+ of the analog acquisition unit is connected to the output terminal AIN1 of the analog acquisition unit through resistor R3, resistor R5 and resistor R14 in sequence, and the negative input terminal IN1- is connected to the output terminal AIN1 through resistor R76 and capacitor C162. A TVS diode D5 is connected between the positive input terminal IN1+ and the negative input terminal IN1-. The node between resistor R3 and resistor R5 is grounded through capacitor C3 and resistor R153 respectively. The node between resistor R5 and resistor R14 is grounded through capacitor C16, and the node between resistor R76 and capacitor C162 is grounded.

[0012] The digital-to-analog conversion unit includes an ADC conversion module and its peripheral circuits.

[0013] The second Ethernet communication unit includes an Ethernet physical layer chip and its peripheral circuits.

[0014] The data acquisition terminal includes a variety of transformer monitoring sensors.

[0015] The multiple transformer monitoring sensors include: a transformer core grounding current sensor and a transformer oil hydrogen monitoring sensor.

[0016] The utility model has the following beneficial effects and advantages:

[0017] 1. The utility model proposes a device for collecting and remotely communicating monitoring data of various transformers, which realizes the integration of various data collection interfaces and meets the diverse needs of transformer monitoring data.

[0018] 2. The utility model proposes a method for expanding the data acquisition interface using a remote IO module, which adopts a modular design to facilitate the expansion or modification of the interface configuration according to monitoring needs, thereby improving the applicability and scalability of the device.

[0019] 3. The utility model adopts a high-performance, low-power embedded ARM core board as a development platform, which can collect and process the collected data on-site, and realize the performance requirements of the transformer monitoring data acquisition device for fast processing speed and low power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system structure diagram of a data acquisition and remote communication device for monitoring multiple transformers;

[0021] Figure 2 This is a schematic diagram of a transformer data acquisition device based on IEC61850 communication;

[0022] Figure 3 This is the circuit schematic diagram of the analog quantity acquisition unit;

[0023] Figure 4 This is the circuit schematic diagram of the digital-to-analog conversion unit;

[0024] Figure 5 This is the circuit schematic diagram of the Ethernet communication unit;

[0025] Figure 6 Implementation schematic for IEC61850 remote communication. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] A device for collecting and remotely communicating monitoring data of various transformers, the implementation process of which specifically includes the following steps:

[0028] (1) Data acquisition: The device transmits data of different types of transformer monitoring sensors or intelligent IED devices by integrating RS485 acquisition unit, 4-20mA analog acquisition unit, digital input unit and Ethernet communication unit. The digital input unit transmits data via Ethernet interface through adapter unit. In addition, RS485 acquisition unit, 4-20mA analog acquisition unit and digital input unit can be expanded through remote IO module, and transmit data via Ethernet interface through adapter unit in accordance with standard ModbusTCP communication protocol.

[0029] (2) Data processing: The embedded ARM core board is used as the development platform to process and analyze the collected monitoring data of different types of transformers on site. The remote control of the transformer operating status is carried out through the integrated digital output unit, such as transformer air-cooled cooler control, switch control, etc. The digital input unit uses the Ethernet interface for data transmission through the adapter unit.

[0030] (3) Data storage: Berkeley DB database is used to store various transformer monitoring data. This database is an open source embedded file database that uses an embedded model to provide database management services for the program.

[0031] (4) IEC61850 Communication: The MMS-EASE Lite protocol stack is used to implement IEC61850 communication with the backend system via an Ethernet communication unit. This protocol stack is an optimized source code package that supports MMS and IEC61850 and is used in embedded applications such as intelligent electronic devices.

[0032] like Figure 1 As shown, the entire monitoring system includes the transformer body and corresponding components, sensor units, a data acquisition terminal, an adapter unit, a digital input unit, a digital output unit, and a backend system. Specifically, the transformer body 1 is equipped with a sensor unit 2, which integrates various transformer monitoring sensors, such as a transformer core grounding current sensor and a transformer oil hydrogen monitoring sensor. Sensor unit 2 is connected to the data acquisition terminal via a shielded cable, enabling analog and RS485 data acquisition. The digital output unit 6 is connected to the digital input unit 5 via a connector, which in turn is connected to the adapter unit 4 via a connector. The adapter unit 4 is connected to the data acquisition terminal 3 via Ethernet, enabling digital data acquisition and control. Interface expansion can also be achieved by connecting to the adapter unit using the aforementioned connector. The data acquisition unit 3 processes, analyzes, stores, and controls the collected signals and connects to the backend system 7 via Ethernet for IEC61850 communication and transmission of collected data.

[0033] like Figure 2 As shown, combined with Figure 1A transformer data acquisition device based on IEC61850 communication includes a data acquisition terminal 3, an adapter unit 4, a digital input unit 5, and a digital output unit 6. The data acquisition terminal 3 mainly includes an analog acquisition unit 3-1, a signal isolation unit 3-2, a digital-to-analog conversion unit 3-3, an RS485 acquisition unit 3-4, a signal isolation unit 3-5, a signal processing unit 3-6, an RS232 debugging unit 3-7, a signal processing unit 3-8, an Ethernet communication unit 3-9, a signal processing unit 3-10, a power supply unit 3-11, a CPU unit 3-12, an LED indication unit 3-13, a USB unit 3-14, an external storage unit 3-15, and an Ethernet communication unit 3-16.

[0034] like Figure 3 As shown, the analog acquisition unit includes TVS diode D5, resistors R3, R5, R14, R76, R153, capacitors C3, C16, and C162. When acquiring analog signals, the TVS diodes prevent voltage surges, absorb transient pulses, and protect the circuit. Node AIN1 between resistor R14 and capacitor C162 serves as the output of the analog acquisition unit, connecting to the signal isolation unit and ultimately the digital-to-analog conversion unit.

[0035] like Figure 4 As shown, the digital-to-analog conversion unit includes resistors R150, R151, R161, R162, R163, R164, capacitors C170, C171, C172, C174, C175, an ADC conversion module, and crystal oscillator Y10. The ADC conversion module is the ADS1256, a micro-power, high-precision, 8-channel, 24-bit high-performance analog-to-digital converter with a maximum sampling rate of 30 kSPS and support for SPI communication, meeting analog acquisition and processing requirements.

[0036] like Figure 5As shown, the Ethernet communication unit includes resistors R86, R94, R95, R96, R97, R98, R99, R113, R114, R115, R116, network resistor RP10, capacitors R78, R79, R80, and an Ethernet physical layer (PHY) chip. The PHY chip model is DP83848K, which is used to implement the physical layer functions of the Ethernet connection. This chip can convert digital signals into analog signals and send them to the Ethernet line, and can also convert analog signals into digital signals for processing by the device. This chip supports IEEE 802.3 standards, including 10BASE-T, 100BASE-TX, and 1000BASE-T, and supports multiple transmission rates, full-duplex and half-duplex operation modes, and can automatically negotiate the connection rate and mode to meet the functional requirements of data transmission and reception.

[0037] like Figure 6 As shown in the figure, IEC61850 remote communication is primarily implemented based on the MMS-EASE Lite protocol stack. This protocol stack is specifically designed for mapping IEC61850 to MMS in embedded applications. It provides a basic MMS protocol processing framework and API interface, as well as IEC61850 modeling capabilities. First, the IEC61850 communication protocol processing module ① obtains relevant data from the Berkeley DB database module ⑦. Using the MMS-EASE Lite protocol stack ②, it performs protocol processing and establishes the MMS communication model, forming a hierarchical structure consisting primarily of logical devices LD③, logical nodes LN④, data objects DO⑤, and data attributes DA⑥. The logical device LD③ is a virtual device that associates related logical nodes and data sets for communication purposes; the logical node LN④ is the smallest part of a data exchange function, an object defined by its data and methods; the data object DO⑤ is a logical node object portion, representing specific information and an instance of a data class, such as a state variable or measurement variable; and the data attribute DA⑥ specifies the name, format, and possible value range of the data, representing the value during transmission. The collected transformer monitoring data is processed and modeled using the MMS-EASE Lite protocol stack, and then communicated with the backend system through the Ethernet communication module ⑧, ultimately achieving IEC61850 remote communication.

[0038] The specific working principle is: the entire system is powered by DC 24V, and power access is achieved through the power module. Figure 2In the system, analog acquisition unit 3-1 collects 4-20mA analog signals and sends them to CPU unit 3-12 via isolation unit 3-2 and digital-to-analog conversion unit 3-3. RS485 acquisition unit 3-4 collects digital signals and sends them to CPU unit 3-12 via isolation unit 3-5 and signal processing unit 3-6. RS232 debugging unit 3-7 receives external debugging signals and sends them to CPU unit 3-12 via signal processing unit 3-8. Digital input unit 5 collects digital input signals, aggregates them through adapter unit 4, and sends them to CPU unit 3-12 via Ethernet communication unit 3-9 and signal processing unit 3-10. CPU unit 3-12 uses a Cortex-A7 series processor with a main frequency of 800MHz and a Linux operating system. It analyzes the data type and acquisition channel of the collected signals, obtains sensor monitoring data after processing, and stores it in real time in the Berkeley DB database. If digital output control is required, the CPU unit 3-12 sends the control signal through the signal processing unit 3-10 to the adapter unit 4 via the Ethernet communication unit 3-9, and then the adapter unit 4 passes it to the digital output unit 6 to realize the remote control function. The CPU unit 3-12 sends the LED indication signal to the LED indication unit 3-13 to realize the LED indication function of the device power supply, program running status, and RS485 interface usage. The U disk can be connected to the data acquisition terminal through the USB unit 3-14, and the U disk data can be stored after being processed by the CPU unit 3-12. The TF card can be connected to the data acquisition terminal through the external storage unit 3-15, and the TF card data can be stored after being processed by the CPU unit 3-12. After performing data analysis and processing, the CPU unit 3-12 implements the IEC61850 protocol function based on the MMS-EASE Lite protocol stack, and conducts IEC61850 communication with the background system through the Ethernet communication unit 3-16.

[0039] In summary, the device has the advantages of high performance, multi-function, good flexibility, good real-time performance, and easy maintenance. It can meet the power industry's demand for diversity and real-time transformer monitoring data, and provide strong support for the safe and stable operation of the power system.

Claims

1. A device for collecting and remotely communicating monitoring data of various transformers, characterized in that: include: A sensor unit (2), a data acquisition terminal (3), an adapter unit (4), a digital quantity input unit (5), a digital quantity output unit (6) and a background system (7), wherein: The sensor unit (2) is arranged on the transformer body and connected to the data acquisition terminal (3) via a shielded cable. The data acquisition terminal (3) is respectively connected to the adapter unit (4) and the background system (7) via Ethernet. The adapter unit (4), the digital input unit (5) and the digital output unit (6) are sequentially connected via connectors.

2. A device for collecting and remotely communicating monitoring data of various transformers according to claim 1, characterized in that: The data acquisition terminal (3) comprises: The invention relates to a CPU unit (3-12) and a digital-to-analog conversion unit (3-3), a first signal processing unit (3-6), a second signal processing unit (3-8), a third signal processing unit (3-10), a power supply unit (3-11), an LED indication unit (3-13), a USB unit (3-14), an external storage unit (3-15), and a second Ethernet communication unit (3-16) respectively connected thereto. The invention also includes a first signal isolation unit (3-2) and an analog quantity acquisition unit (3-1) connected in sequence to the digital-to-analog conversion unit (3-3), a second signal isolation unit (3-5) and an RS485 acquisition unit (3-4) connected in sequence to the first signal processing unit (3-6), an RS232 debugging unit (3-7) connected to the second signal processing unit (3-8), and a first Ethernet communication unit (3-9) connected to the third signal processing unit (3-10), wherein the first Ethernet communication unit (3-9) is connected to the adapter unit (4).

3. The device for collecting and remotely communicating monitoring data of various transformers according to claim 2, characterized in that: The analog quantity acquisition unit (3-1) comprises: The positive input terminal IN1+ of the analog acquisition unit is connected to the output terminal AIN1 of the analog acquisition unit through resistor R3, resistor R5 and resistor R14 in sequence, and the negative input terminal IN1- is connected to the output terminal AIN1 through resistor R76 and capacitor C162. A TVS diode D5 is connected between the positive input terminal IN1+ and the negative input terminal IN1-. The node between resistor R3 and resistor R5 is grounded through capacitor C3 and resistor R153 respectively. The node between resistor R5 and resistor R14 is grounded through capacitor C16, and the node between resistor R76 and capacitor C162 is grounded.

4. The device for collecting monitoring data and remote communication for multiple transformers according to claim 2, characterized in that: The digital-to-analog conversion unit (3-3) includes an ADC conversion module and its peripheral circuits.

5. The device for collecting monitoring data and remote communication of multiple transformers according to claim 2, characterized in that: The second Ethernet communication unit (3-16) includes an Ethernet physical layer chip and its peripheral circuits.

6. The device for collecting monitoring data and remote communication of multiple transformers according to claim 1, characterized in that: The data acquisition terminal (3) includes a variety of transformer monitoring sensors.

7. The device for collecting monitoring data and remote communication for multiple transformers according to claim 6, characterized in that: The multiple transformer monitoring sensors include: a transformer core grounding current sensor and a transformer oil hydrogen monitoring sensor.

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