Dropout Time Characteristics with Disk Emulation acc. to IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also Figure 4-1 and Figure 4-2)
The dropout time curves apply to (Ι/Ιp) ≤ 0.90
For zero sequence current, read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
;
for ground fault, read Ι
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Dropout Setting
IEC without Disk Emulation
approx. 1.05 · setting value Ι
p
for Ι
p
/Ι
N
≥ 0.3, this corresponds to
approx. 0.95 · pickup value
Reset of the Integration Timer
IEC with Disk Emulation
approx. 0.90 · setting value Ι
p
Toleranzen
Anrege-, Rückfallschwellen
Ι
p
, Ι
Ep
2 % vom Einstellwert, bzw. 10 mA für Ι
N
= 1 A oder 50 mA für Ι
N
5 A
Anregezeit für 2 ≤ Ι/Ι
p
≤ 20
5 % vom Sollwert + 2 % Stromtoleranz, bzw. 30 ms
Rückfallzeit für Ι/
Ιp
≤ 0,90
5 % vom Sollwert + 2 % Stromtoleranz, bzw. 30 ms
Influencing Variables for Pickup and Dropout
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperatur im Bereich –5 °C ≤ Θ
amb
≤ 131.00 °F (55 °C) 0,5 %/10 K
Frequency in range 25 Hz to 70 Hz 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1 %
1 %
Transient overreaction during fundamental harmonic measuring procedure for τ > 100 ms
(with full displacement)
<5 %
Technical Data
4.3 Inverse-time Overcurrent Protection
SIPROTEC 4, 7SJ62/64, Manual 453
C53000-G1140-C207-8, Edition 08.2016
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