ABB REC650 ANSI Technical Manual page 9

Technical manual
Function block................................................................................... 86
Signals...............................................................................................86
Settings..............................................................................................87
Monitored data...................................................................................89
Operation principle............................................................................ 89
Second harmonic blocking element...................................................94
Technical data................................................................................... 95
Instantaneous residual overcurrent protection EFPIOC (50N)............... 95
Identification ..................................................................................... 95
Functionality.......................................................................................96
Function block................................................................................... 96
Signals...............................................................................................96
Settings..............................................................................................96
Monitored data...................................................................................97
Operation principle............................................................................ 97
Technical data................................................................................... 97
Four step residual overcurrent protection, zero, negative sequence
direction EF4PTOC (51N/67N)............................................................... 98
Identification ..................................................................................... 98
Functionality.......................................................................................98
Function block................................................................................... 99
Signals...............................................................................................99
Settings............................................................................................100
Monitored data.................................................................................103
Operation principle.......................................................................... 103
Operating quantity within the function........................................ 103
Internal polarizing....................................................................... 104
External polarizing for ground-fault function............................... 107
Base quantities within the protection.......................................... 108
Internal ground-fault protection structure....................................108
Four residual overcurrent steps..................................................108
Directional supervision element with integrated directional
comparison function................................................................... 109
Second harmonic blocking element.................................................114
Technical data................................................................................. 115
Sensitive directional residual overcurrent and power protection
SDEPSDE (67N)...................................................................................116
Identification.................................................................................... 116
Functionality.................................................................................... 116
Function block................................................................................. 116
Table of contents
3