ABB ret650 - Page 11

Identification ............................................................................. 143
Functionality.............................................................................. 143
Function block........................................................................... 144
Signals.......................................................................................144
Settings......................................................................................145
Monitored data...........................................................................147
Operation principle.................................................................... 147
Second harmonic blocking element...........................................151
Technical data........................................................................... 152
Instantaneous residual overcurrent protection EFPIOC ................ 152
Identification ............................................................................. 152
Functionality.............................................................................. 153
Function block........................................................................... 153
Signals.......................................................................................153
Settings......................................................................................153
Monitored data...........................................................................154
Operation principle.................................................................... 154
Technical data........................................................................... 154
Four step residual overcurrent protection, zero, negative
sequence direction EF4PTOC .......................................................154
Identification ............................................................................. 155
Functionality.............................................................................. 155
Function block........................................................................... 156
Signals.......................................................................................156
Settings......................................................................................157
Monitored data...........................................................................160
Operation principle.................................................................... 160
Operating quantity within the function.................................. 160
Internal polarizing................................................................. 161
External polarizing for earth-fault function............................164
Base quantities within the protection....................................164
Internal earth-fault protection structure................................ 164
Four residual overcurrent steps............................................165
Directional supervision element with integrated
directional comparison function............................................166
Second harmonic blocking element...........................................170
Technical data........................................................................... 171
Thermal overload protection, two time constants TRPTTR ...........172
Identification ............................................................................. 172
Functionality.............................................................................. 172
Function block........................................................................... 173
Signals.......................................................................................173
Settings......................................................................................174
Monitored data...........................................................................175
Table of contents
5
Technical manual