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Section 4
1MAC050144-MB C
Protection functions
278
615 series ANSI
Technical Manual
4.3.2.6
Signals
Table 273: 81LS H input signals
Table 274: 81SH output 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
Name
Type
Description
TRIP
BOOLEAN
Trip of load shedding
OPR_FRQ
BOOLEAN
Trip signal for under frequency
OPR_FRG
BOOLEAN
Trip signal for high df/dt
PICKUP
BOOLEAN
Pickup
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
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