ABB RELION 630 Series Technical Manual page 17

PML630/Compact Load-Shedding Solution
Technical Manual
Power flow sign conventions..................................................... 204
Compensated circuit breaker status.......................................... 205
Load-shedding trigger................................................................206
Fast load-shedding trigger....................................................206
Slow load-shedding trigger...................................................206
Manual load-shedding trigger ..............................................207
Extended load-shedding trigger........................................... 207
Load-shedding blocking.............................................................208
Power data holding and delay................................................... 209
Load-shedding functions................................................................ 210
Power source circuit breaker function PSCSWI ....................... 210
Load busbar monitoring function LDMMXU...............................210
Network circuit breaker function NCBDCSWI............................210
Network power monitoring function NPMMXU.......................... 210
Contingency based load-shedding function LSCACLS ............ 211
Load-shedding trip command function LSPTRC....................... 213
Subnetwork output function SNWRCLS ................................... 213
Peer-to-peer load-shedding function PPLSGGIO .....................214
Power-source circuit breaker PSCSWI...........................................214
Identification.............................................................................. 214
Function block........................................................................... 215
Functionality.............................................................................. 215
Operation principle.................................................................... 216
Power monitoring................................................................. 216
Block logic............................................................................ 218
Compensated CB status...................................................... 220
General logic........................................................................ 220
Fast load shed trigger logic.................................................. 222
Over current based load shed.............................................. 222
Demand based load shed.................................................... 224
Slow load shed logic.............................................................226
Binary to integer module...................................................... 228
Signals.......................................................................................230
Settings......................................................................................231
Measured values....................................................................... 233
Monitored data...........................................................................234
Technical data........................................................................... 235
Load busbar monitoring LDMMXU................................................. 235
Identification.............................................................................. 235
Function block........................................................................... 236
Functionality.............................................................................. 236
Operation principle.................................................................... 237
Power monitoring................................................................. 237
Table of contents
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