ABB REG650 - Page 11

Monitored data...........................................................................163
Operation principle.................................................................... 163
Lens characteristic............................................................... 166
Detecting an out-of-step condition........................................168
Maximum slip frequency.......................................................169
Taking care of the circuit breaker soundness.......................170
Design.................................................................................. 172
Technical data........................................................................... 172
Load encroachment LEPDIS ......................................................... 173
Identification.............................................................................. 173
Functionality.............................................................................. 173
Function block........................................................................... 173
Signals.......................................................................................173
Settings......................................................................................174
Operation principle.................................................................... 174
Load encroachment..............................................................174
Simplified logic diagrams......................................................175
Technical data........................................................................... 176
Section 8 Current protection.........................................................177
Four step phase overcurrent protection 3-phase output
OC4PTOC ..................................................................................... 177
Identification ............................................................................. 177
Functionality.............................................................................. 177
Function block........................................................................... 178
Signals.......................................................................................178
Settings......................................................................................179
Monitored data...........................................................................181
Operation principle.................................................................... 181
Second harmonic blocking element...........................................185
Technical data........................................................................... 186
Four step residual overcurrent protection, zero, negative
sequence direction EF4PTOC .......................................................186
Identification ............................................................................. 186
Functionality.............................................................................. 187
Function block........................................................................... 187
Signals.......................................................................................188
Settings......................................................................................189
Monitored data...........................................................................191
Operation principle.................................................................... 191
Operating quantity within the function.................................. 192
Internal polarizing................................................................. 193
External polarizing for earth-fault function............................195
Base quantities within the protection....................................196
Table of contents
5
Technical manual