Technical Data
4.12 Frequency Protection (Optional)
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
316
4.12 Frequency Protection (Optional)
Frequency Elements
Pickup Values
Times
Dropout Difference
Operating Ranges
Tolerances
Quantity 4, depending on setting effective on f< or f>
f> or f< adjustable for each element
For f
Nom
= 50 Hz 45.50 Hz to 54.50 Hz Increments 0.01 Hz
For f
Nom
= 60 Hz 55.50 Hz to 64.50 Hz Increments 0.01 Hz
Pickup times f>, f< approx. 85 ms
Dropout times f>, f< approx. 30 ms
Time delays T 0.00 s to 600.00 s Increments 0.01 s
The set times are pure time delays.
Note on drop-off times:
Drop-off was enforced by current = 0 A and voltage = 0 V.
Enforcing the drop-off by means of a frequency change below the drop-off threshold extends the drop-off times.
Δf = I pickup value - dropout value I 0.02 Hz to 1 Hz
In voltage range approx. 0.65 · V
N
up to 230 V (phase-phase)
In frequency range 25 Hz to 70 Hz
Frequencies f>, f< in specific range (f
N
± 10 %) 15 MHz in range V
PhPh
: 50 V to 230 V
Time delays T(f<, f>) 1 % of setting value or 10 ms
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