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Table 469:
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
4.5.2.6
Signals
Table 470:
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 471:
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
4.5.2.7
Settings
Table 472:
LSHDPFRQ Group settings (Basic)
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
1MRS758755 A
Section 4
Protection functions
REC615 and RER615
451
Technical Manual
Summary of Contents for RELION Series
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