Technical Data
4.9 Negative Sequence Protection (inverse-time characteristics)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
380
Trip Time Curves acc. to ANSI
Tolerances
Dropout Time Curves with Disk Emulation acc. to ANSI
It can be selected one of the represented trip time characteristic curves in the figures 4-8 and 4-9 each on the
right side of the figure.
The trip times for I
2
/I
2p
≥ 20 are identical to those for I
2
/I
2p
= 20.
Pickup Threshold Approx. 1.10· I
2p
Pickup threshold I
2p
3 % of setting value or 15 mA for I
Nom
= 1 A
or 75 mA at I
Nom
= 5 A
Time for 2 ≤ I/I
2p
≤ 20 5 % of reference (calculated) value +2 % current tolerance,
or 30 ms
Representation of the possible dropout time curves, see figure 4-8 and 4-9 each on the left side of the figure
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