Frequency Protection
Setting Ranges / Increments
Number of frequency elements 4; each can be set f> or f<
adjustable
Pickup threshold 81O or 81U for f
Nom
= 50 Hz 40.00 Hz to 60.00 Hz Increments
0.01 Hz
Pickup threshold 81O or 81U for f
Nom
= 60 Hz 50.00 Hz to 70.00 Hz Increments
0.01 Hz
Dropout difference =
|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 oder ∞ (disa-
bled)
Increments
0.01 s
Undervoltage blocking
with three-phase connection:
Positive sequence component V
1
with single phase connection:
single-phase-to-ground- or phase-tophase Voltage
10 V to 150 V Increments 1 V
Times
Pickup times 81O, 81U
approx. 80 ms
Dropout times 81O, 81U approx. 75 ms
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 (at V = V
Nom
, f = f
N
)
10 mHz (at V = V
Nom
)
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 %
4.14
Technical Data
4.14 Frequency Protection
SIPROTEC 4, 7SJ62/64, Manual 479
C53000-G1140-C207-8, Edition 08.2016
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