2021-08-03 at 11:08 am
#1756
AMIR KHASHAYAR
During the test , the relay and restraint function have operated properly . Because the ratio of second harmonics to fundamental component has been measured correctly , and reley has distiguished the inrush current nature . But , during real case , it’s because the other relay has been under load and steady state current , the fundamental component is large and the ratio of second harmonics to fundamental component is low or lower than setting . Thus , the restraint function is not active