ABB REG670 - Page 10

Operation principle.................................................................... 180
Full scheme measurement................................................... 180
Impedance characteristic..................................................... 181
Basic operation characteristics.............................................182
Theory of operation.............................................................. 184
Simplified logic diagrams......................................................193
Technical data........................................................................... 197
Directional impedance element for mho characteristic ZDMRDIR. 197
Identification.............................................................................. 197
Functionality.............................................................................. 197
Function block........................................................................... 198
Signals.......................................................................................198
Settings......................................................................................199
Monitored data...........................................................................200
Operation principle.................................................................... 200
Directional impedance element for mho characteristic
ZDMRDIR.............................................................................200
High speed distance protection ZMFPDIS..................................... 203
Identification.............................................................................. 203
Functionality.............................................................................. 203
Function block........................................................................... 205
Signals.......................................................................................205
Settings......................................................................................208
Monitored data...........................................................................212
Operation principle.................................................................... 212
Filtering.................................................................................212
Distance measuring zones................................................... 213
Phase-selection criteria........................................................ 214
Directional criteria.................................................................215
Fuse failure...........................................................................216
Power swings....................................................................... 216
Measuring principles............................................................ 216
Load encroachment..............................................................219
Simplified logic schemes...................................................... 220
Technical data........................................................................... 226
High speed distance protection ZMFCPDIS ..................................226
Identification.............................................................................. 226
Functionality.............................................................................. 226
Function block........................................................................... 228
Signals.......................................................................................229
Settings......................................................................................231
Monitored data...........................................................................237
Operation principle.................................................................... 237
Table of contents
4
Technical manual