Siemens 7SC80 - Page 512

Trip Time Curves acc. to IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also Figure 4-1 and Figure 4-2)
The tripping times for Ι/Ι
p
≥ 20 are identical with those for Ι/Ι
p
= 20
For zero sequence current, read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
for ground fault, read Ι
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Pickup threshold
approx. 1.10 · Ι
p
Dropout Time Characteristics with Disk Emulation acc. to IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also
Figure 4-1 and Figure 4-2)
The dropout time curves apply to (Ι/Ιp) ≤ 0.90
For zero sequence current, read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
;
for ground fault, read Ι
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Technical Data
4.3 Inverse-Time Overcurrent Protection
512 SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017