Siemens SIPROTEC 4 7UT6 Series - Page 422

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