Equipment protection, capacitors............................................... 252
Power supply quality
...................................................................252
High impedance grounded systems
........................................... 252
Direct grounded system..............................................................253
Settings for two step residual overvoltage protection................. 254
Voltage differential protection VDCPTOV (60)..................................... 256
Identification.................................................................................... 256
Application....................................................................................... 256
Setting guidelines............................................................................ 257
Loss of voltage check LOVPTUV (27).................................................. 259
Identification.................................................................................... 259
Application....................................................................................... 259
Setting guidelines............................................................................ 259
Advanced users settings............................................................ 259
Section 9 Frequency protection.........................................................261
Underfrequency protection SAPTUF (81).............................................261
Identification.................................................................................... 261
Application....................................................................................... 261
Setting guidelines............................................................................ 262
Overfrequency protection SAPTOF (81)...............................................262
Identification.................................................................................... 263
Application....................................................................................... 263
Setting guidelines............................................................................ 263
Rate-of-change of frequency protection SAPFRC (81)........................ 264
Identification.................................................................................... 264
Application....................................................................................... 264
Setting guidelines............................................................................ 265
Section 10 Multipurpose protection..................................................... 267
General current and voltage protection CVGAPC................................ 267
Identification.................................................................................... 267
Application....................................................................................... 267
Current and voltage selection for CVGAPC function..................268
Base quantities for CVGAPC function........................................ 271
Application possibilities...............................................................271
Inadvertent generator energization.............................................272
Setting guidelines............................................................................ 273
Directional negative sequence overcurrent protection............... 273
Negative sequence overcurrent protection.................................275
Table of contents
6 Busbar protection REB670 2.2 ANSI
Application manual
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