Siemens 7SC80 - Frequency Protection 81

Frequency Protection 81
Setting Ranges/Increments
Number of frequency elements 4; each can be set to f> or f<
Pickup values f> or f< at f
Nom
= 50 Hz 40.00 Hz to 60.00 Hz Increments 0.01 Hz
Pickup values f> or f< at 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
Delay times T 0.00 s to 100.00 s or ∞
(unwirksam)
Increments 0.01 s
Undervoltage blocking
with three-phase connection: Positive-sequence
component V
1
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 value
Dropout ratio for undervoltage blocking
approx. 1.05
Tolerances
Frequencies f>, f<
Undervoltage blocking
Delay times T(f>, f<)
approx. 20 mHz (at U = U
Nom
, f = f
Nom
± 5 Hz)
3 % of setting value or 1 V
1 % of setting value or 10 ms
Influencing Variables for Pickup and Dropout Values
Auxiliary direct voltage in the range of 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in the range of 23.00 °F (-5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Harmonics
- up to 10 % 3. harmonic
- up to 10 % 5. harmonic
1 %
1 %
4.13
Technical Data
4.13 Frequency Protection 81
SIPROTEC Compact, 7SC80, Manual 543
E50417-G1140-C486-A8, Edition 07.2017