Siemens SIPROTEC 7SJ80

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
Ι
Nom
= 1 A
3 % of setting value or 15 mA
Ι
Nom
= 5 A
3 % of setting value or 75 mA
Time for 2 ≤ Ι/Ι
2p
≤ 0.90
5 % of reference (calculated) value + 2 % current tolerance, or 30 ms
Influencing Variables for Pickup Values
Auxiliary DC voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1,15 1 %
Temperature in range –5 °C (23 °F) ≤ Θ
amb
≤ 55 °C (131 °F) 0.5 %/10 K
Frequency in the range of 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Nom
≤ 1.05 (f
Nom
= 50 Hz or 60 Hz) 1 %
Frequency outside range 0.95 ≤ f/f
Nom
≤ 1.05 Increased tolerances
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)
386 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017