ABB REL650 series Technical Manual page 12

Table of contents
6
Technical data................................................................................. 212
Instantaneous residual overcurrent protection EFPIOC (50N)............. 212
Identification ................................................................................... 213
Functionality.................................................................................... 213
Function block................................................................................. 213
Signals.............................................................................................213
Settings............................................................................................214
Monitored data.................................................................................214
Operation principle.......................................................................... 214
Technical data................................................................................. 214
Four step residual overcurrent protection, zero, negative sequence
direction EF4PTOC (51N/67N)............................................................. 215
Identification ................................................................................... 215
Functionality.................................................................................... 215
Function block................................................................................. 216
Signals.............................................................................................216
Settings............................................................................................217
Monitored data.................................................................................220
Operation principle.......................................................................... 220
Operating quantity within the function........................................ 221
Internal polarizing....................................................................... 222
External polarizing for ground-fault function............................... 225
Base quantities within the protection.......................................... 225
Internal ground-fault protection structure....................................225
Four residual overcurrent steps..................................................225
Directional supervision element with integrated directional
comparison function................................................................... 226
Second harmonic blocking element.................................................231
Technical data................................................................................. 232
Sensitive directional residual overcurrent and power protection
SDEPSDE (67N)...................................................................................233
Identification.................................................................................... 233
Functionality.................................................................................... 233
Function block................................................................................. 233
Signals.............................................................................................234
Settings............................................................................................234
Monitored data.................................................................................236
Operation principle ......................................................................... 236
Function inputs........................................................................... 236
Directional residual current protection measuring 3I ·cos φ.......237
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Technical manual