Siemens SIPROTEC 4 7UT6 Series Manual page 422

Technical Data
4.4 Time Overcurrent Protection for Residual Current
Trip Time Curves acc. to ANSI
Acc. to ANSI/IEEE (see also
The tripping times for Ι/Ι
For residual current read 3Ι0p instead of Ι
for earth faults read Ι
Pickup Threshold
Dropout Time Curves as per ANSI/IEEE
Acc. to ANSI/IEEE (see also
422
Figure 4-9 to Figure 4-12)
≥ 20 are identical to those for Ι/Ι
p
and T
p
instead of Ι and T instead of T
Ep p
ΙEp
Figure 4-9 to Figure 4-12)
= 20
p
instead of T
3Ι0p p
p
approx. 1.10 · Ι
p
C53000-G1176-C230-5, Edition 09.2016
SIPROTEC 4, 7UT6x, Manual