Frequency Protection 81 O/U - Siemens SIPROTEC 4 Manual

Technical Data

4.11 Frequency Protection 81 O/U

4.11 Frequency Protection 81 O/U
Setting Ranges / Increments
Setting Ranges / Increments
Pickup values f> or f< for f
Pickup values f> or f< for f
Dropout threshold
= |pickup threshold - dropout threshold|
Time delays T
Undervoltage blocking
with three-phase connection:
Positive sequence component V
with single-phase connection ("Vphn, Vsyn"):
single-phase Phase-to-ground voltage
Times
Pickup times f>, f<
Dropout times f>, f<
Dropout Difference
Δf = Ι pickup value - dropout value Ι
Dropout Ratio
Dropout Ratio for Undervoltage Blocking
Tolerances
Pickup frequencies 81/O or 81U
Undervoltage blocking
Time delays 81/O or 81/U
Influencing Variables
Power supply direct voltage in range 0.8 ≤ V
Temperature in range 23 °F (-5 °C) ≤ Θ
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
390
4; each can be set to f> or f<
= 50 Hz 40.00 Hz to 60.00 Hz
Nom
= 60 Hz 50.00 Hz to 70.00 Hz
Nom
0.02 Hz to 1.00 Hz
0.00 s to 100.00 s or ∞ (disabled)
10 V to 150 V
1
≤ 5 mHz Tolerance (at V = V
< 15 mHz Tolerance (at V = V
< 15 mHz Tolerance (at V = V
3 % of setting value or 1 V
1 % of setting value or 10 ms
/V ≤ 1.15
PS PSNom
≤ 131 °F (55 °C)
amb
approx. 100 ms at f = 50 Hz
Nom
approx. 80 ms at f = 60 Hz
Nom
approx. 100 ms at f = 50 Hz
Nom
approx. 80 ms at f = 60 Hz
Nom
0.02 Hz to 1 Hz
approx. 1.05
, f - 0.5 Hz < f < f
Nom Nom
, f - 5 Hz < f < f
Nom Nom
, f + 0.5 Hz < f < f
Nom Nom
E50417-G1140-C343-A8, Edition 12.2017
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 s
Increments 1 V
+ 0.5 Hz)
Nom
- 0.5 Hz)
N
+ 5 Hz)
Nom
1 %
0,5 %/10 K
1 %
1 %
SIPROTEC 4, 7SJ80, Manual