Articles

Design and Implementation of an Arduino Based Undervoltage Relay

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All human activity is highly dependent on the stable availability of electrical energy. Electrical distribution disruptions, such as  over/under voltage spikes or drops, can disrupt daily activities. To anticipate this,  an Arduino-based over/under voltage control  system was designed that utilizes the PZEM-004T sensor to monitor AC voltage in real-time from a power source or variable transformer. The system uses an on-off  control method on the relay with three operating conditions: under voltage (voltage <142.5V), normal voltage (142.5V–157.5V), and overvoltage (voltage >157.5V). SMPS (Switched-Mode Power Supply) is integrated as a stable power supply for Arduino Uno microcontrollers and other electronic components, ensuring that system performance remains optimal despite input voltage fluctuations. The sensor reading results and voltage condition status can be displayed locally via a simple interface such as an LCD or LED indicator, without relying on internet communication. By combining the reliability of Arduino Uno and SMPS efficiency, the system is able to protect electrical devices from damage due to voltage instability while ensuring energy-efficient operation.

Design and Construction of Thermal Overload Relay (Siemens 3ua50) Based on Arduino Uno

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A Thermal Overload Relay (TOR) is a device in an electric motor protection system designed to safeguard the motor from damage due to overheating or overcurrent. This research discusses the design and implementation of a Thermal Overload Relay (TOR) based on Arduino Uno, which is a popular and flexible microcontroller platform. This design includes the PZEM-004T sensor to detect the electrical current and temperature of the electric motor. The design integrates the advantages of the PZEM-004T sensor in accurately measuring current and voltage with the flexibility and programming capabilities of Arduino in control and data processing. This system utilizes Arduino’s communication capabilities to transmit current and temperature data in real-time, enabling remote monitoring and quick response to potentially hazardous conditions. The result of this project is a tool that can replace the function of the TOR itself, where the characteristics produced are close to those of conventional TORs, and the thermal principle in the TOR is regulated with a time delay disconnection in the Arduino program.