50 Hz
Start value Freq set at 0.975 xFn
Start value df/dt set at -0.020 xFn/s
Operate Tm df/dt = 500ms
Operate Tm Freq = 1000ms
Load shed mode = Freq< AND df/dt
49 Hz
ST_FRG
OPR_FRG
500ms
1s
OPERATE is not
activated in this case
as Freq< condition not
satisfied
OPERATE
Start of operation timer
Time [s]
Frequency
[Hz]
GUID-DB333B09-D987-4A62-ABAE-7B70ACA275EB V2 EN
Figure 265: Load-shedding operation in the “Freq< AND df/dt>” mode when
only the df/dt condition is satisfied (Rated frequency=50 Hz)
Restore detection
If after the activation of the OPERATE input the frequency recovers to a level
above the Restore start Val setting, the RESTORE signal output is activated. The
RESTORE output remains active for a 100 ms. The Restore mode setting is used to
select the restoring mode to be "Disabled", "Auto" or "Manual".
1YHT530004D05 D Section 4
Protection functions
615 series 507
Technical Manual
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