Microprocessor-based out-of-phase reclosing protection for nonutility generation units

Protection against an out of phase reconnection with the utility power network is one of the most important protection requirements for nonutility generation (NUG) units, since an out-of-phase reclosing will certainly damage the rotating equipment and windings of a generator. Power system test studies presented show that the power-based protection algorithm provides a very good performance for reliable detection of out-of-phase reclosing conditions.