Siemens 7SK80 - Negative Sequence Protection (Definite-Time Characteristic)

Technical Data
4.8 Negative Sequence Protection (definite-time characteristic)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
378
4.8 Negative Sequence Protection (definite-time characteristic)
Setting Ranges / Increments
Functional Limit
Times
Dropout Ratio
Tolerances
Influencing Variables for Pickup Values
Unbalanced load tripping element
46-1,46-2
for I
Nom
= 1 A 0.05 A to 3.00 A or ∞ (disabled) Increments 0.01 A
for I
Nom
= 5 A 0.25 A to 15.00 A or ∞ (disabled)
Delay Times 46-1, 46-2 0.00 s to 60.00 s or ∞ (disabled) Increments 0.01 s
Dropout Delay Times 46 T DROP-OUT 0.00 s to 60.00 s Increments 0.01 s
Functional Limit for I
Nom
= 1 A all phase currents ≤ 10 A
for I
Nom
= 5 A all phase currents ≤ 50 A
for I
Nom
= 1 A one phase current ≥ 0.05 A
for I
Nom
= 5 A one phase current ≥ 0.25 A
Pickup Times
Dropout Times
Approx. 35 ms
Approx. 35 ms
Characteristic 46-1, 46-2 Approx. 0.95 for I
2
/I
Nom
≥ 0.3
Pickup values 46-1, 46-2 3 % of setting value or 15 mA for I
Nom
= 1 A, or 75 mA for I
Nom
= 5 A
Time Delays 1 % or 10 ms
Auxiliary DC voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1.15 1 %
Temperature in range –5 °C (41 °F) ≤ Θ
amb
≤ 55 °C (131 °F) 0.5 %/10 K
Frequency in range of 25 Hz – 70 Hz
Frequency in 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 %