What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 ? It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.

What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT

1.	What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 ? It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.
A.	10.0 sec
B.	1.92 sec
C.	4.5 sec
D.	2.4 sec
Answer» C. 4.5 sec

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What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 ? It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.

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