Technical Data
4.9 Negative Sequence Protection 46-TOC
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
365
Trip Time Curves acc. to ANSI
Tolerances
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
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