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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 227:
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".
Section 4
1MRS758755 A
Protection functions
446
REC615 and RER615
Technical Manual
Summary of Contents for RELION Series
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