ABB Relion REC670 Applications Manual page 11

8.2.2 Application.................................................................................................................................. 178
8.2.3 Setting guidelines......................................................................................................................179
8.2.3.1 Equipment protection, such as for motors, generators, reactors and
transformers........................................................................................................................... 179
8.2.3.2 Equipment protection, capacitors......................................................................................179
8.2.3.3 Power supply quality..............................................................................................................179
8.2.3.4 High impedance earthed systems......................................................................................180
8.2.3.5 The following settings can be done for the two step overvoltage protection......... 180
8.3 Two step residual overvoltage protection ROV2PTOV .......................................................... 181
8.3.1 Identification.............................................................................................................................. 181
8.3.2 Application.................................................................................................................................. 181
8.3.3 Setting guidelines......................................................................................................................182
8.3.3.1 Equipment protection, such as for motors, generators, reactors and
transformers........................................................................................................................... 182
8.3.3.2 Equipment protection, capacitors......................................................................................182
8.3.3.3 Power supply quality..............................................................................................................182
8.3.3.4 High impedance earthed systems...................................................................................... 182
8.3.3.5 Direct earthed system........................................................................................................... 183
8.3.3.6 Settings for Two step residual overvoltage protection.................................................184
8.4 Voltage differential protection VDCPTOV ............................................................................... 186
8.4.1 Identification.............................................................................................................................. 186
8.4.2 Application..................................................................................................................................186
8.4.3 Setting guidelines......................................................................................................................187
8.5 Loss of voltage check LOVPTUV ................................................................................................ 188
8.5.1 Identification.............................................................................................................................. 188
8.5.2 Application..................................................................................................................................189
8.5.3 Setting guidelines..................................................................................................................... 189
8.5.3.1 Advanced users settings...................................................................................................... 189
Section 9 Frequency protection..................................................................................... 191
9.1 Underfrequency protection SAPTUF ......................................................................................... 191
9.1.1 Identification.............................................................................................................................. 191
9.1.2 Application.................................................................................................................................. 191
9.1.3 Setting guidelines...................................................................................................................... 191
9.2 Overfrequency protection SAPTOF ........................................................................................... 192
9.2.1 Identification.............................................................................................................................. 192
9.2.2 Application.................................................................................................................................. 192
9.2.3 Setting guidelines......................................................................................................................193
9.3 Rate-of-change frequency protection SAPFRC ....................................................................... 193
9.3.1 Identification.............................................................................................................................. 193
9.3.2 Application.................................................................................................................................. 193
9.3.3 Setting guidelines..................................................................................................................... 194
9.4 Frequency time accumulation protection function FTAQFVR..............................................194
9.4.1 Identification.............................................................................................................................. 194
9.4.2 Application.................................................................................................................................. 195
9.4.3 Setting guidelines..................................................................................................................... 196
Application manual
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