Measurement principle............................................................... 197
Time delay.................................................................................. 198
Blocking...................................................................................... 198
Design........................................................................................ 198
Technical data................................................................................. 199
Rate-of-change frequency protection SAPFRC (81)............................ 199
Identification.................................................................................... 199
Functionality.................................................................................... 199
Function block................................................................................. 200
Signals.............................................................................................200
Settings............................................................................................200
Operation principle.......................................................................... 201
Measurement principle............................................................... 201
Time delay.................................................................................. 201
Design........................................................................................ 202
Technical data................................................................................. 202
Section 9 Secondary system supervision..........................................203
Current circuit supervision CCSRDIF (87)............................................203
Identification.................................................................................... 203
Functionality.................................................................................... 203
Function block................................................................................. 203
Signals.............................................................................................204
Settings............................................................................................204
Operation principle.......................................................................... 205
Technical data................................................................................. 206
Fuse failure supervision SDDRFUF......................................................206
Identification.................................................................................... 206
Functionality.................................................................................... 207
Function block................................................................................. 207
Signals.............................................................................................208
Settings............................................................................................208
Monitored data.................................................................................209
Operation principle.......................................................................... 210
Zero and negative sequence detection...................................... 210
Delta current and delta voltage detection................................... 211
Dead line detection.....................................................................214
Main logic................................................................................... 214
Technical data................................................................................. 218
Breaker close/trip circuit monitoring TCSSCBR................................... 218
Table of contents
8
Technical manual
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