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 for Ι
2
/Ι
2p
= 20
Pickup Threshold
approx. 1.10· Ι
2p
Toleranzen
Pickup threshold
Ι
2p
Ι
Nom
= 1 A
3 % of setting value or 15 mA
Ι
Nom
= 5 A
3 % of setting value or 75 mA
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
4.10 Negative Sequence Protection (inverse-time characteristics)
SIPROTEC 4, 7SJ80, Manual 385
E50417-G1140-C343-A8, Edition 12.2017
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