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