ABB RER620

1MAC309294-MB F Section 4
Protection functions
RER620 233
Technical Manual
Table 244: Setting for a five-step restoring operation
4.4.2.6 Signals
Table 245: 81S input signals
Table 246: 81S output signals
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
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
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