With the digital transformation and upgrading of the power system,the number of sensors involved in the online monitoring device and the complexity of the system structure are greatly increased.In this context,real-time monitoring of the operating status of the current transformer is particularly important.Traditional current transformer monitoring methods rely on regular observation of the oil level of the transformer,real-time monitoring is not possible.To address this need,introduction of IoT LoRa spread spectrum communication technology,design and implement the internal pressure response and health monitoring software and hardware platform of current transformer based on LoRa technology.The system comprises four parts:a pressure collection unit,a data acquisition terminal,a data centralization unit,and a data visualization platform.The insulating oil in the transformer is led to the acquisition terminal by the conversion joint and the deflector in the pressure collection unit,and pressurized to the piezoresistive element of the sensor through the pressure hole,the piezoresistive element is deformed when pressed,produces an impedance change,the actual pressure value is converted into a conversion,the AD conversion module in the data acquisition terminal converts this into a digital signal,some erroneous data is eliminated through the data isolation chip,the optimized data is reprocessed via the main chip STM32 microcontroller,finally,the wireless LoRa module is packaged and sent to the data centering unit,which is processed and calculated by the main chip STM32 microcontroller.The processed data is then converted by the serial port chip according to the data format of the specific protocol for the host computer to read,and finally realizes the real-time monitoring of the internal pressure of the current transformer.
Current transformersLoRa technologyPressure monitoringSTM32 microcontroller
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