8.2.3.3 Power supply quality.............................................................................................................. 211
8.2.3.4 High impedance earthed systems.......................................................................................211
8.2.3.5 The following settings can be done for the two step overvoltage protection.......... 211
8.3 Two step residual overvoltage protection ROV2PTOV .......................................................... 212
8.3.1 Identification.............................................................................................................................. 212
8.3.2 Application.................................................................................................................................. 213
8.3.3 Setting guidelines......................................................................................................................213
8.3.3.1 Equipment protection, such as for motors, generators, reactors and
transformersEquipment protection for transformers................................................... 213
8.3.3.2 Equipment protection, capacitors......................................................................................213
8.3.3.3 Power supply quality..............................................................................................................213
8.3.3.4 High impedance earthed systems...................................................................................... 214
8.3.3.5 Direct earthed system........................................................................................................... 214
8.3.3.6 Settings for two step residual overvoltage protection.................................................. 215
8.4 Voltage differential protection VDCPTOV ................................................................................217
8.4.1 Identification.............................................................................................................................. 217
8.4.2 Application.................................................................................................................................. 217
8.4.3 Setting guidelines......................................................................................................................218
8.5 Loss of voltage check LOVPTUV .................................................................................................219
8.5.1 Identification.............................................................................................................................. 219
8.5.2 Application.................................................................................................................................. 219
8.5.3 Setting guidelines......................................................................................................................219
8.5.3.1 Advanced users settings.......................................................................................................219
Section 9 Frequency protection.....................................................................................221
9.1 Underfrequency protection SAPTUF ......................................................................................... 221
9.1.1 Identification.............................................................................................................................. 221
9.1.2 Application.................................................................................................................................. 221
9.1.3 Setting guidelines......................................................................................................................221
9.2 Overfrequency protection SAPTOF ........................................................................................... 222
9.2.1 Identification.............................................................................................................................. 222
9.2.2 Application.................................................................................................................................. 222
9.2.3 Setting guidelines......................................................................................................................223
9.3 Rate-of-change of frequency protection SAPFRC .................................................................. 223
9.3.1 Identification.............................................................................................................................. 223
9.3.2 Application.................................................................................................................................. 223
9.3.3 Setting guidelines..................................................................................................................... 224
Section 10 Multipurpose protection............................................................................... 225
10.1 General current and voltage protection CVGAPC....................................................................225
10.1.1 Identification.............................................................................................................................. 225
10.1.2 Application..................................................................................................................................225
10.1.2.1 Current and voltage selection for CVGAPC function...................................................... 226
10.1.2.2 Base quantities for CVGAPC function................................................................................ 228
10.1.2.3 Application possibilities....................................................................................................... 228
10.1.2.4 Inadvertent generator energization...................................................................................229
10.1.3 Setting guidelines..................................................................................................................... 229
Table of contents
Busbar protection REB670 5
Application manual
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