Siemens siprotec SJ62 User Manual page 468

Trip Time Curves acc. to ANSI
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Acc. to ANSI/IEEE (see also Figures 4-3 to 4-6)
The tripping times for I/I
p
For zero-sequence current read 3I0p instead of I
for ground fault read I instead of I
Ep
Pickup Threshold
4.3 Inverse Time Overcurrent Protection 51, 51N
≥ 20 are identical with those for I/I
and T
p
and T instead of T
p
IEp
approx. 1.10 · I
= 20.
p
instead of T ;
3I0p p
p
p
466