ABB RELION 630 Series Technical Manual page 289

1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual
The module receives the fast load-shed trigger signals SRC_FLS_TRG from the
NPMMXU function and FLS_TRG_CB
Figure 153 shows fast load-shed trigger signals for different subnetworks for various
conditions.
EXT_LS_TRG
SRC_FLS_TRG
FLS_TRG_CB
12
FLS_TRG_CB
56
LS_BLOCK1
LS_BLOCK2
LS_BLOCK3
LS_BLOCK4
GUID-A97495F6-B1A1-4FCF-BAD7-D6B68AE128EB V1 EN
Figure 153: Calculation of fast load-shed trigger signal for subnetworks
The module counts the number of times the fast load-shedding trigger signal is
generated and the FLS_COUNTER (fast load-shedding counter) output provides the
count. The FLS_COUNTER output can be reset through the FLS_CNT_RST (fast
load-shedding counter reset) input. The FLS_COUNTER output is provided in the
monitoring view.
The module receives the slow load-shed trigger signals,
SLS_TRG_BB1...SLS_TRG_BB4, for busbar 1...4 from NPMMXU function. If
any of the busbar slow load-shed trigger signal is active, slow load-shed action is
initiated in corresponding subnetwork.
Figure 154 shows slow load-shed trigger signals for different subnetworks for various
conditions.
Power management functions
from the respective NCBDCSWI functions.
ij
1
0
OR
Section 7
FLS_TRG_SNW1
AND
FLS_TRG_SNW2
AND
FLS_TRG_SNW3
AND
FLS_TRG_SNW4
AND
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