Technical Data
4.20 Frequency Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
623
4.20 Frequency Protection (optional)
Frequency Elements
Pick-up Values
Times
Dropout Frequency
Operating Range
Tolerances
Quantity 4, depending on setting effective on f< or f>
f> or f< adjustable for each element
For f
N
= 50 Hz 45.50 Hz to 54.50 Hz Increments 0.01 Hz
For f
N
= 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
Delay times T 0.00 s to 600.00 s Increments 0.01 s
The set times are pure delay times.
Note on dropout times:
Dropout was enforced by current = 0 A and voltage = 0 V.
Enforcing the dropout by means of a frequency change below the dropout threshold extends the dropout times.
Δf = | pickup value – dropout value | Approx. 20 mHz
In voltage range Approx. 0.65 · U
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 U
LL
: 50 V to 230 V
Time delays T(f<, f>) 1 % of setting value or 10 ms
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