Ono of  the most Critical operations in any Power Systems  is any Power Systems  is the paralleling of machines. The  basler.  Auto Synchronizing  Relay removes this function from the  hands of  the operator  and/ or Semi Automatic  Permission relaying  system and precisely places a machine on the line with no disturbance.
Auto synchronizing realy combines voltage and frequenly maching with phase sensing and sequencing    circuits to  provide  breaker  closure  at  approximately  zero  phase angle  with  the aid  of an anticipation  function  to offset  the  pre selected  breaker closure  time.