Abstract
Voltage imbalance condition often causes issues in the operation of three-phase electrical equipment. It results in overheating, improper operation, or performance-related issues. The system proposed here was developed to protect the three-phase rectifier used in a DC Machines lab with 30kW capacity from the voltage imbalance. It was developed as a simple and low-cost system that can effectively satisfy the intention. It continuously compares the supply voltage levels using voltage sensors and stops the power supply if there is a significant difference in the phase voltage levels. It will display the phase voltage levels in the liquid crystal display and also will give an alert using the buzzer. This system was successfully implemented and tested and can be used to protect other three-phase equipment as well.
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