Table 432: Setting for a five-step restoring operation
Load-shedding steps Restoring start Val setting Restore delay time setting
1 0.990 · Fn (49.5 Hz) 200000 ms
2 0.990 · Fn (49.5 Hz) 160000 ms
3 0.990 · Fn (49.5 Hz) 100000 ms
4 0.990 · Fn (49.5 Hz) 50000 ms
5 0.990 · Fn (49.5 Hz) 10000 ms
4.6.2.6 Signals
Table 433: LSHDPFRQ Input signals
Name Type Default Description
F SIGNAL 0 Measured frequency
dF/dt SIGNAL 0 Rate of change of frequency
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
BLK_REST BOOLEAN 0=False Block restore
MAN_RESTORE BOOLEAN 0=False Manual restore signal
Table 434: LSHDPFRQ Output signals
Name
Type Description
OPERATE BOOLEAN Operation of load shedding
OPR_FRQ BOOLEAN Operate signal for under frequency
OPR_FRG BOOLEAN Operate signal for high df/dt
START BOOLEAN Start
ST_FRQ BOOLEAN Pick-Up signal for under frequency detection
ST_FRG BOOLEAN Pick-Up signal for high df/dt detection
RESTORE BOOLEAN Restore signal for load restoring purposes
ST_REST BOOLEAN Restore frequency attained and restore timer
started
4.6.2.7 Settings
Table 435: LSHDPFRQ Group settings
Parameter
Values (Range) Unit Step Default Description
Load shed mode 1=Freq<
6=Freq< OR df/dt
8=Freq< AND df/
dt
1=Freq< Set the operation mode for load
shedding function
Restore mode 1=Disabled
2=Auto
3=Manual
1=Disabled Mode of operation of restore functionality
Start value Freq 0.800...1.200 xFn 0.001 0.975 Frequency setting/start value
Table continues on next page
Section 4 1YHT530004D05 D
Protection functions
512 615 series
Technical Manual
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