Siemens SIPROTEC 4 7SJ61 - Page 307

Trip Time Curves acc. to ANSI
It can be selected one of the represented trip time characteristic curves in Figure 4-8 and Figure 4-9 each on
the right side of the figure.
The trip times for Ι
2
/Ι
2p
≥ 20 are identical to those forΙ
2
/Ι
2p
= 20
Pickup Threshold
approx. 1.10· Ι
2p
Tolerances
Pickup Threshold
Ι
2p
3 % of setting value or 10 mA for Ι
Nom
= 1 A
or 50 mA with Ι
Nom
= 5 A
Time for 2 ≤ Ι/Ι
2p
≤ 20
5 % of reference (calculated) value + 2 % current tolerance,
or 30 ms
Dropout Time Curves with Disk Emulation acc. to ANSI
Representation of the possible dropout time curves, see
Figure 4-8 and Figure 4-9 each on the left side of the
figure
Technical Data
4.8 Negative Sequence Protection (inverse-time characteristics)
SIPROTEC 4, 7SJ61, Manual 307
C53000-G1140-C210-6, Edition 05.2016