Rectified over current protecting method for single and three phase installations, involves generating positive and negative potentials by transformer terminal to provide voltage for recognizing forward or reverse direction of energy flow

摘要

The method involves obtaining parameters for determining a direction of over current by tapping parametric factors from a current transformer. A current path is tapped from a secondary winding, at which a resistance and a voltage distributor are connected in parallel with two resistances in series. A transformer terminal generates a positive potential and a negative potential in order to provide a voltage for recognizing forward or reverse direction of flow of energy.