Frequency Protection 81 O/U - Siemens SIPROTEC 7SK80 Manual

4.13

Frequency Protection 81 O/U

Setting ranges / increments
Number of frequency elements
Pickup values f> or f<
for f = 50 Hz
Nom
Pickup values f> or f<
for f = 60 Hz
Nom
Dropout threshold
= |pickup threshold - dropout threshold|
Delay times T
Undervoltage blocking
Times
Pickup times f>, f<
Dropout times f>, f<
Dropout Difference
Δf = I pickup value - dropout value I
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 23.00 °F (-5 °C) ≤ Θ
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
4; each can be set to f> or f<
40.00 Hz to 60.00 Hz
50.00 Hz to 70.00 Hz
0.02 Hz to 1.00 Hz
0.00 s to 100.00 s or ∞ (dis-
abled)
10 V to 150 V
approx. 100 ms at f
approx. 80 ms at f
approx. 100 ms at f
approx. 80 ms at f
0.02 Hz to 1 Hz
approx. 1.05
15 mHz (with V = V
3 % of setting value or 1 V
1 % of setting value or 10 ms
/V ≤ 1.15
PS PSNom
≤ 131.00 °F (55 °C)
amb
Technical Data
4.13 Frequency Protection 81 O/U
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 s
Increments 1 V
= 50 Hz
Nom
= 60 Hz
Nom
= 50 Hz
Nom
= 60 Hz
Nom
, f = f ± 5 Hz)
nom Nom
1 %
0.5 %/10 K
1 %
1 %
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