Siemens SIPROTEC 4 User Manual page 472

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 Ι /Ι ≤ 0.90
2 2p
Influencing Variables for Pickup Values
Power supply direct voltage in range 0.8
0.8 ≤ V /V
PS PSNom
Temperature in range 23.00 °F (-5 °C) ≤ Θ
Frequency in range 25 Hz to 70 Hz
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
Transient overreaction for τ > 100 ms (with full displacement)
472
/Ι
2 2p
approx. 1.05 Ι
threshold Ι
approx. 0.90 Ι
2p
≤ 1.15
amb
) ≤ 0.90
, setting value, which is approx. 0.95 · pickup
2p
2
setting value
2p
2 % of setting value or 10 mA for Ι
or 50 mA für Ι = 5 A
Nom
5 % of reference (calculated) value +2 % current tolerance,
or 30 ms
≤ 131.00 °F (55 °C)
= 1 A
Nom
1 %
0.5 %/10 K
1 %
1 %
1 %
<5 %
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016