The dropout time constants apply to (Ι
2
/Ι
2p
) ≤ 0.90
Dropout Value
IEC and ANSI (without Disk Emulation)
approx. 1.05 Ι
2p
, setting value, which is approx. 0.95 · pickup
threshold Ι
2
ANSI with Disk Emulation
approx. 0.90 Ι
2p
setting value
Tolerances
Dropout value Ι
2p
Time for Ι
2
/Ι
2p
≤ 0.90
2 % of setting value or 10 mA for Ι
Nom
= 1 A
or 50 mA für Ι
Nom
= 5 A
5 % of reference (calculated) value +2 % current tolerance,
or 30 ms
Influencing Variables for Pickup Values
Power supply direct voltage in range 0.8
0.8 ≤ V
PS
/V
PSNom
≤ 1.15
1 %
Temperature in range 23.00 °F (-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 for τ > 100 ms (with full displacement) <5 %
Technical Data
4.10 Negative Sequence Protection (inverse-time characteristics)
472 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
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