Siemens SIPROTEC 4 Manual page 386

Technical Data
4.10 Negative Sequence Protection (inverse-time characteristics)
The dropout time constants apply to (Ι
Dropout Value
IEC and ANSI (without Disk Emulation)
ANSI with Disk Emulation
Tolerances
Dropout value Ι
Time for 2 ≤ Ι/Ι
Influencing Variables for Pickup Values
Auxiliary DC voltage in range 0.8 ≤ V
Temperature in range –5 °C (23 °F) ≤ Θ
Frequency in the range of 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Frequency outside range 0.95 ≤ f/f
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
Transient overreaction for τ > 100 ms (with full displacement)
386
/Ι
2 2p
3 % of setting value or 15 mA
= 1 A
Ι
2p Nom
= 5 A 3 % of setting value or 75 mA
Ι
Nom
5 % of reference (calculated) value + 2 % current tolerance, or 30 ms
≤ 0.90
2p
/V
Aux AuxNom
amb
≤ 1.05 (f
Nom
≤ 1.05
Nom
) ≤ 0.90
approx. 1.05 Ι , setting value, which is approx. 0.95 · pickup
2p
threshold Ι
2
approx. 0.90 Ι setting value
2p
≤ 1,15
≤ 55 °C (131 °F)
= 50 Hz or 60 Hz)
Nom
1 %
0.5 %/10 K
1 %
Increased tolerances
1 %
1 %
<5 %
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017