Siemens SIPROTEC 7SJ62 Manual page 482

Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
Dropout Time Characteristics with Disk Emulation acc. to IEC
Ass. to IEC 60255-3 or BS 142, Section 3.5.2 (see also Figures 4-1 and 4-2)
The dropout time curves apply to (I/Ip) ≤ 0.90
For zero-sequence current read 3I0p instead of I
for ground fault read I
Dropout Setting
IEC without Disk Emulation
IEC with Disk Emulation
Tolerances
Pickup/dropout thresholds I
Pickup time for 2 ≤ I/I
Dropout time for I/Ip ≤ 0.90
Influencing Variables for Pickup and Dropout
Power supply direct voltage in range 0.8 ≤ V
Temperature in range 23.00 °F (-5 °C) ≤ Θ
Frequency in range 0.95 ≤ f/f
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
Transient overreaction during fundamental harmonic measuring procedure for τ > 100 ms
(with full displacement)
482
instead of I and T instead of T
Ep p IEp
approx. 1.05 · setting value I
0.95 · pickup value
approx. 0.90 · set value I
, I 2% of setting value or 10 mA for I
p Ep
≤ 20
5 % of reference (calculated) value + 2 % current tolerance, respective-
p
ly 30 ms
5 % of reference (calculated) value + 2 % current tolerance, respective-
ly 30 ms
/V
PS PSNom
≤ 131.00 °F (55 °C)
amb
≤ 1.05
Nom
and T instead of T ;
p 3I0p p
p
≥ 0.3, this corresponds to approx.
for I /I
p p N
p
= 1 A, or 50 mA for I
N
≤ 1.15
C53000-G1140-C207-2, Release date 01.2008
= 5 A
N
1 %
0.5 %/10 K
1 %
1 %
1 %
<5 %
SIPROTEC, 7SJ62/64, Manual