Siemens SIPROTEC 7SJ61, Руководство пользователя, Страница: 325 / 454

Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008 325
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 / I p)
≤
0.90
For zero-sequence current read 3 I 0p instead of I
p
and T
3
I
0p
instead of T
p
;
for ground fault read
I
Ep
instead of
I
p
and T
I Ep
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