ABB Relion 630 Series, Technical Manual

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Table 343: Load-shedding information of the subnetwork calculated by the General logic module
Output Load-shedding information
LS_OPERATE If LS_OPR_STS output is Fast Load shed, Slow Load shed,
Manual Load shed or Extended Load shed, then the LS_OPERATE
output is TRUE, else the LS_OPERATE output is FALSE.
NEG_POW_BAL This output is calculated as TRUE if the EFF_POW_BAL value is
less than zero (that is, negative).
DIF_MUST_ACT This output provides the difference in the must-shedding and the
actual loadshedding of the subnetwork, that is, DIF_MUST_ACT =
MUST_SHD_LOD - ACT_SHD_LOD.
SLS_TRG_INH If SLS_ENA_SNW signal is activated, SLS_TRG_INH is inactive
else SLS_TRG_INH is active.
7.10.5 Signals
Table 344: SNWRCLS Input signals
Name Type Default Description
SNW GROUP
SIGNAL
- Group signal for subnetwork
Table 345: SNWRCLS Output signals
Name Type Description
DISABLE_LS BOOLEAN Load shed disable
SN_ACTIVE BOOLEAN Subnetwork active status
LS_BLOCK BOOLEAN Load shed block
SLS_TRG_INH BOOLEAN Slow load shed trigger inhibit
NEG_POW_BAL BOOLEAN Negative power balance status
LS_RESET BOOLEAN Load shed reset
MAN_LS_TRG BOOLEAN Manual load shed trigger
LS_OPERATE BOOLEAN Load shed operate
LS_OPR_STS INTEGER Load shed operated status
AVA_POWER REAL Total Available power
RUNNING_LOAD REAL Total load
SHDABL_LOAD REAL Total sheddable load
POWER_BAL REAL Power balance in the subnetwork
EFF_POW_BAL REAL Effective power balance in the subnetwork
LOD_MISMATCH REAL Total load mismatch
SHD_PRIO_RC1 INTEGER Record-1 subnetwork shed priority
SHD_PRIO_RC2 INTEGER Record-2 subnetwork shed priority
SHD_PRIO_RC3 INTEGER Record-3 subnetwork shed priority
MUST_SHD_LOD REAL Must be load shed
ACT_SHD_LOD REAL Actually shed load
Table continues on next page
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution 309
Technical Manual