Frequency Protection 81 O/U - Siemens SIPROTEC 7SJ62 Manual

4.14

Frequency Protection 81 O/U

Setting Ranges / Increments
Number of frequency elements
Pickup threshold 81O or 81U for f
Pickup threshold 81O or 81U for f
Dropout difference
= |pickup threshold - dropout threshold|
Delay times T
Undervoltage blocking
with three-phase connection:
Positive sequence componentV
with single phase connection:
single-phase phase-to-ground or
phase-to-phase voltage
Times
Pickup times 81O, 81U
Dropout times 81O, 81U
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, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
4; each can be set f> or f<
= 50 Hz 40.00 Hz to 60.00 Hz
Nom
= 60 Hz 50.00 Hz to 70.00 Hz
Nom
0.02 Hz to 1.00 Hz
0.00 s to 100.00 s or ∞ (disabled) Increments 0.01 s
10 V to 150 V
1
Approx. 80 ms
Approx. 75 ms
approx. 1.05
10 mHz (with V = V
3 % of setting value or 1 V
1 % of setting value or 10 ms
≤ 1.15
/V
PS PSNom
≤ 131.00 °F (55 °C)
amb
Technical Data
4.14 Frequency Protection 81 O/U
Increments 0.01 Hz
Increments 0.01 Hz
Increments 0.01 Hz
Increments 1V
, f = f )
Nom Nom
1 %
0.5 %/10 K
1 %
1 %
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