Siemens 7SC80 Manual page 516

Technical Data
4.3 Inverse-Time Overcurrent Protection
Trip Time Curves acc. to ANSI
Acc. to ANSI/IEEE (see also
The tripping times for Ι/Ι
For zero sequence current read 3Ι0p instead of Ι
for ground fault read Ι
Pickup threshold
Dropout Time Characteristics with Disk Emulation acc. to ANSI/IEEE
Acc. to ANSI/IEEE (see also
516
Figure 4-3 bis Figure 4-6)
≥ 20 are identical with those for Ι/Ι
p
p
instead of Ι and T instead of T
Ep p ΙEp
Figure 4-3 bis Figure 4-6)
= 20
p
and T instead of T ;
3Ι0p p
p
ca. 1.10 · Ι
p
E50417-G1140-C486-A8, Edition 07.2017
SIPROTEC Compact, 7SC80, Manual