Microprocessor-based system for identification of phase sequence and detection of phase unbalance of three-phase ac supply

A prototype detection system based on 8085 microprocessor/8751 microcontroller has been developed for identification 017 phase sequence and detection of phase unbalance. System principle compares self-generating code by hardware circuit With pre-defined specific codes corresponding to positive and negative sequences for successful match in each measuring cycle. System is also capable in detecting phase unbalance, if any. Rule based intricate software algorithm is developed and operates within a cycle. Processor generates signals for detecting phase sequence and phase unbalance up to a recommended value.