TYPES OF PROTECTION When  fault  occurs  in  any  part  of  system,  it  must  be  cleared  quickly  to  avoid  damage  or  interference  with  rest  of  the  system.  Protection  scheme  is  divided  into  two  classes-  primary  protection and back up protection. Primary protection It’s  used  for  protection  of  component  parts  of  power  system.  In  fig  1  each  line  has  an  over current relay that protects the line. If a fault occurs on any line, it will be cleared by its relay and  circuit  breaker.  This  forms  the  primary  or  the main  protection  and  serves  as  the  first  line  of  defense. Sometimes faults are not cleared by primary relaying because of trouble within the relay,  wiring system, read more

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