Frequency Protection 81 - Siemens 7SC80 Manual

4.13

Frequency Protection 81

Setting Ranges/Increments
Number of frequency elements
Pickup values f> or f< at f
Pickup values f> or f< at f
Dropout threshold
= |pickup threshold – dropout threshold|
Delay times T
Undervoltage blocking
with three-phase connection: Positive-sequence
component V
1
Times
Pickup times f>, f<
Dropout times f>, f<
Dropout Difference
Δf = Ι pickup value - dropout value Ι
Dropout value
Dropout ratio for undervoltage blocking
Tolerances
Frequencies f>, f<
Undervoltage blocking
Delay times T(f>, f<)
Influencing Variables for Pickup and Dropout Values
Auxiliary direct voltage in the range of 0.8 ≤ V
Temperature in the range of 23.00 °F (-5 °C) ≤ Θ
Harmonics
- up to 10 % 3. harmonic
- up to 10 % 5. harmonic
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
= 50 Hz
Nom
= 60 Hz
Nom
/V
PS PSNom
≤ 131.00 °F (55 °C)
amb
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 ∞
(unwirksam)
10 V to 150 V
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
approx. 20 mHz (at U = U
3 % of setting value or 1 V
1 % of setting value or 10 ms
≤ 1.15 1 %
0.5 %/10 K
1 %
1 %
Technical Data
4.13 Frequency Protection 81
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 s
Increments 1 V
, f = f ± 5 Hz)
Nom Nom
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