Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
486
Dropout Time Characteristics with Disk Emulation acc. to ANSI/IEEE
Dropout Setting
Acc. to ANSI/IEEE (see also Figures 4-3 to 4-6)
The dropout time curves apply to (I/Ip) ≤ 0.90
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
IEC without Disk Emulation approx. 1.05 · setting value I
p
for I
p
/I
N
≥ 0.3; this corresponds to approx.
0.95 · pickup value
ANSI with Disk Emulation approx. 0.90 · set value I
p
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