IDMT RELAY EASY EXPLANATION | why we use IDMT relay on feeder | What is IDMT over current relay

IDMT RELAY EASY EXPLANATION | why we use IDMT over current on feeder
IDMT is Inverse Definite Minimum Time

Normal Inverse (t) =TMSX(0.14 /(〖(Ia/Is)〗^0.02-1))
Very Inverse(t) = TMSX(13.5 /(〖(Ia/Is)〗^1-1))
Extremely Inverse(t) =TMSX(80 /(〖(Ia/Is)〗^2-1))
A Long time inverse(t) =TMSX(120 /(〖(Ia/Is)〗^1-1))

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