
Technical data................................................................................. 168
Section 8 Current protection..............................................................169
Four step phase overcurrent protection OC4PTOC(51/67).................. 169
Identification.................................................................................... 169
Functionality.................................................................................... 169
Function block................................................................................. 170
Signals.............................................................................................170
Settings............................................................................................172
Monitored data.................................................................................178
Operation principle.......................................................................... 179
Technical data................................................................................. 187
Four step residual overcurrent protection, (Zero sequence or
negative sequence directionality) EF4PTOC (51N/67N)...................... 188
Identification.................................................................................... 188
Functionality.................................................................................... 188
Function block................................................................................. 189
Signals.............................................................................................189
Settings............................................................................................190
Monitored data.................................................................................198
Operation principle.......................................................................... 198
Operating quantity within the function........................................ 199
Internal polarizing....................................................................... 200
External polarizing for ground-fault function............................... 202
Directional detection for ground fault function............................ 202
Base quantities within the protection.......................................... 202
Internal ground-fault protection structure....................................203
Four residual overcurrent steps..................................................203
Directional supervision element with integrated directional
comparison function................................................................... 204
Second harmonic blocking element............................................207
Switch on to fault feature............................................................ 209
Technical data................................................................................. 211
Four step directional negative phase sequence overcurrent
protection NS4PTOC (46I2)..................................................................212
Identification.................................................................................... 212
Functionality.................................................................................... 213
Function block................................................................................. 213
Signals.............................................................................................214
Settings............................................................................................215
Monitored data.................................................................................220
Table of contents
4Phasor measurement unit RES670 2.1 ANSI
Technical manual