Technical Data
4.14 Frequency Protection 81 O/U
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
509
4.14 Frequency Protection 81 O/U
Setting Ranges / Increments
Times
Dropout Ratio
Tolerances
Influencing Variables
Number of frequency elements 4; each can be set f> or f<
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 or ∞ (disabled) Increments 0.01 s
Undervoltage blocking
with three-phase connection:
Positive sequence componentV
1
with single phase connection:
single-phase phase-to-ground or
phase-to-phase voltage
10 V to 150 V Increments 1V
Pickup times 81O, 81U Approx. 80 ms
Dropout times 81O, 81U Approx. 75 ms
Dropout Ratio for Undervoltage Blocking approx. 1.05
Pickup Frequencies 81/O or 81U
Undervoltage Blocking
Time Delays 81/O or 81/U
10 mHz (with V = V
Nom
, f = f
Nom
)
3 % of setting value or 1 V
1 % of setting value or 10 ms
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in range 23.00 °F (-5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%
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