Technical Data
4.8 Negative Sequence Protection 46-TOC
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
336
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 10 mA for I
Nom
= 1 A or 50 mA with I
Nom
= 5 A
Time for 2 ≤ I/I
2p
≤ 20 5 % of reference (calculated) value + 2 % current tolerance, respectively 30 ms
Representation of the possible dropout time curves, see figure 4-8 and 4-9 each on the left side of the figure
The dropout time constants apply to (I
2
/I
2p
) ≤ 0.90
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