For operating Time IDMT Characteristic shape with Relay
Power ON condition
as per class5 of 60255-151 cl.5.2 or
± 60 ms whichever is greater
*(Under reference Condition)
DT Operation
with Relay Power ON condition
± 5% or ± 60 ms whichever is greater**
IDMT characteristic shape
with Relay Power OFF condition
as per class5 of 60255-151 cl.5.2 or
± 90 ms whichever is greater *
(Under reference Condition)
DT Operation
with Relay Power OFF condition
± 5% or ± 90 ms whichever is greater **
Typical Operation Time with auxiliary
supply ON
<= 60 mS
(protection time-delay set to 0 ms; the
injection current is greater than two times
the setting value) The P15D is supplied
from auxiliary supply or pre fault current is
above 0.2
I
n.
Operating time when Relay is self-powered
and breaker is operated with SOTF
condition
<= 80mS
(protection time-delay set to 0 ms; the
injection current is greater than two times of
the setting value and above In) The pre-
fault current is zero and there is no auxiliary
supply. The case: CB switches on to fault
without auxiliary voltage supply.
*Reference Condition TMS=1 , I>setting of 1A ,Operating range
2-20 In
** Reference Condition Fault current 1.5 times above set value
Under current function (For proper operation, relay must be Powered ON by external auxiliary supply)
II.
For operating value Pick-up Below 0.20 In : 0.95 x settings ± 7.50%
Above 0.20 In : 0.95 x settings ± 5%
Drop –off Below 0.20 In : 1.05 x settings ± 7.50%
Above 0.20 In : 1.05 x settings ± 5%
For operating time DT Operation ± 5% or ± 60 ms whichever is greater
III.
Thermal Overload function
For operating Time Thermal Trip operation ± 10% of calculated time
IV.
Cold Load Pickup function
tcold operating Time tcold Setting ± 10%
tclp operating Time tclp Setting ± 10%
For operating Value Pick-up Setting +10% / - 5%
Minimum Trip Level of IDMT 1.05 x Settings ± 5%
Drop –off 0.95 x settings ± 5%
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