Design and development of three Phase ACVoltage Scanner

In this work the device measured voltage (phase to phase & phase to neutral) of sequentially, and give the output in the form of digitally. In this work three step down transformer is used for gets the different load voltage of three phase circuit, this voltage in going analog to digital converter circuit through the bilateral switch. The bilateral switch is operated through decade counter and the counter output is depending on the astable multivibrator. The output of astable multivibrator is controlled through RC constant.