Projects / Measurements, sensors and data acquisition
Hardware platform for monitoring a three-phase 0.4 kV network: voltage/current measurement, RMS and power calculations, GSM, LoRa and microSD.
The task was to develop a compact device for continuous monitoring of a three-phase electrical network. The system had to measure voltage and current channels, calculate network parameters, store history when communication is unavailable and transfer data to a remote system.
The hardware development was prepared from the available materials: technical requirements, master/slave monitoring architecture, main STM32H7 board, multi-channel measurement front end, GSM, LoRa, microSD, battery power and debug interfaces. The next stage requires a full test program.
Project materials
Engineering context
The device had to connect safely to a power network and scale signals down to ADC level.
Diagnostics required not only voltage values, but also RMS values, currents, active, reactive and apparent power, power factor and phase imbalance.
When communication is unavailable, data has to be stored locally.
The architecture had to support several measurement nodes and data transfer to a server-side system.
Work done
Power-quality monitoring architecture.
Main-board schematic.
STM32H743ZITx selection.
Multi-channel analog measurement front end.
GSM communication for data transfer.
LoRa communication between devices.
microSD for local history storage.
Battery power, indication, protection and debug interfaces.
Details
The purpose of the project is power-quality monitoring with later intelligent data processing. The device has to watch the network continuously, keep a history and calculate parameters that help identify overloads, voltage dips, phase imbalance and abnormal states. The research part of the project processes the collected data further.
GSM is used for server data transfer, microSD for storing history when communication is unavailable and LoRa for communication between devices in a distributed system.
The hardware platform and architecture were prepared, but a public final result should be confirmed separately through testing and the research part of the data-processing work.
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