Siemens siprotec SJ62 User Manual page 464

Dropout Time Characteristics with Disk Emulation acc. to IEC
Dropout Setting
Tolerances
Influencing Variables for Pickup and Dropout
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
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 for the range 0.05 ≤ (I/Ip) ≤ 0.90
For zero-sequence current read 3I0p instead of I
for ground fault read I instead of I
Ep
IEC without Disk Emulation
IEC with Disk Emulation
Pickup/dropout thresholds I
Pickup time for 2 ≤ I/I ≤ 20
p
≤ 0.90
Dropout ratio for I/I
p
Power supply direct voltage in range 0.8 ≤
≤ 1.15
V /V
PS PSNom
Temperature in range
23.00 °F (–5 °C) ≤ Θ ≤ 131.00 °F (55 °C)
amb
Frequency in range 0.95 ≤ f/f
4.3 Inverse Time Overcurrent Protection 51, 51N
and T
p
and T instead of T
p IEp
approx. 1.05 · set value I
corresponds to approx. 0.95 · pickup threshold
approx. 0.90 · set value I
, I 2 % of set value or 10 mA for I
p Ep
or 50 mA for I
5 % of reference (calculated) value + 2 %
current tolerance, respectively 30 ms
5 % of reference (calculated) value + 2 %
current tolerance, respectively 30 ms
1 %
0.5 %/10 K
≤ 1.05
1 %
Nom
instead of T ;
3I0p p
p
for I /I
p p Nom
p
Nom
= 5 A
Nom
≥ 0.3,
= 1 A
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