Frequency Protection
Measuring Range of the Frequency Functions
Lower frequency limit Rated frequency 50/60/16.7 Hz approx. 9.25 Hz
Upper frequency limit Rated frequency 50/60 Hz approx. 70 Hz
Rated frequency 16.7 Hz approx. 23.33 Hz
Minimum positive sequence
voltage for frequency measure-
ment (phase-phase voltage)
approx. 8.6 V
Minimum positive sequence
voltage for frequency measure-
ment (non-interlinked voltage)
approx. 5 V
Setting Ranges / Increments
Number of frequency elements 4; can be set to f<, f<<, f<<< or f>
Pickup values f<, f<<, f<<<
Rated frequency 50 Hz 40.00 to 49.99 Hz
or 0 (disabled)
Rated frequency 60 Hz 50.00 to 59.99 Hz
or 0 (disabled)
Rated frequency 16.7 Hz 10.00 to 16.69 Hz
or 0 (disabled)
Pickup value f>
Rated frequency 50 Hz 50.01 to 66.00 Hz
or ∞ (disabled)
Rated frequency 60 Hz 60.01 to 69.99 Hz
or ∞ (disabled)
Rated frequency 16.7 Hz 60.01 to 69.99 Hz
or ∞ (disabled)
Delay times T f<< 0.00 s to 600.00 s
or ∞ (disabled)
Increments 0.01 s
Delay times T f<, T f<<<,T f> 0.00 s to 100.00 s
or ∞ (disabled)
Increments 0.01 s
Undervoltage blocking
(positive sequence component U
1
)
10.0 V to 125.0 V and
0 V
1)
(no blocking)
Increments 0.1 V
The set times are pure delay times
1)
No pickup is effected below the minimum voltage for frequency measurement
Times
Pickup times f>, f<
50/60 Hz approx. 100 ms
16.7 Hz approx. 300 ms
Dropout times f>, f<
50/60 Hz approx. 160 ms
16.7 Hz approx. 480 ms
Dropout difference
Δf = | Pickup Value – Dropout Value |
approx. 20 mHz
Dropout ratio
Dropout ratio for Undervoltage Blocking
approx. 1.10
4.16
Technical Data
4.16 Frequency Protection
SIPROTEC 4, 7UT6x, Manual 451
C53000-G1176-C230-5, Edition 09.2016
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