Siemens SIPROTEC 7UT613 series Manual page 447

Trip Time Curves acc. to ANSI
7UT613/63x Manual
C53000-G1176-C160-2
4.4 Time Overcurrent Protection for Phase and Residual Currents
Acc. to ANSI/IEEE (see also Figures 4-9 to 4-12)
The tripping times for I/I
p
For residual current read 3I0p instead of I
for earth faults read I instead of I
Ep
Pickup Threshold
≥ 20 are identical to those for I/I
and T
p 3I0p
and T instead of T
IEp
p
approx. 1.10 · I
= 20.
p
instead of T ;
p
p
p
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