Siemens SIPROTEC 7SJ62 - Page 485

Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
485
Trip Time Curves acc. to ANSI
Acc. to ANSI/IEEE (see also Figures 4-3 to 4-6)
The tripping times for I/I
p
≥ 20 are identical with those for I/I
p
= 20.
For zero-sequence current read 3I0p instead of I
p
and T
3I0p
instead of T
p
;
for ground fault read I
Ep
instead of I
p
and T
IEp
instead of T
p
Pickup Threshold approx. 1.10 · I
p
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