plz explain TSM and PSM.with example suppose ct ratio is
4000/5 and tsm is .15 and plug is at 3.75 if fault current
is 8000A.so how i find relay oprating time.
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Answer Posted / yashpal
plug setting is = 3.75 means pick up= 3.75 A.Relay
operating time will depends on the charecteristic of relay.
(invese,normal inverse).if the fault current is 8000A then
current in the sec will be 10 A which is three times of
3.75A(connected plug setting),now just watch the relay
charteristic written on relay u can get the time required
for relay operation.(ex- for inverse charecteristic relay
for 3 time current & tms = 1 ,timing is 6.25 sec,so for
our problem timing will be 6.25 * 0.15=0.9375 sec.
| Is This Answer Correct ? | 16 Yes | 5 No |
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