ABB REC670 Applications Manual page 12

Table of contents
6
Two step residual overvoltage protection ROV2PTOV ................. 235
Identification.............................................................................. 235
Application................................................................................. 235
Setting guidelines...................................................................... 235
Equipment protection, such as for motors, generators,
reactors and transformersEquipment protection for
transformers......................................................................... 236
Equipment protection, capacitors......................................... 236
Power supply quality............................................................ 236
High impedance earthed systems........................................ 236
Direct earthed system.......................................................... 237
Settings for two step residual overvoltage protection...........238
Voltage differential protection VDCPTOV ......................................240
Identification.............................................................................. 240
Application................................................................................. 240
Setting guidelines...................................................................... 242
Loss of voltage check LOVPTUV .................................................. 243
Identification.............................................................................. 243
Application................................................................................. 244
Setting guidelines...................................................................... 244
Advanced users settings...................................................... 244
Section 10 Frequency protection....................................................245
Underfrequency protection SAPTUF ............................................. 245
Identification.............................................................................. 245
Application................................................................................. 245
Setting guidelines...................................................................... 245
Overfrequency protection SAPTOF ...............................................246
Identification.............................................................................. 246
Application................................................................................. 247
Setting guidelines...................................................................... 247
Rate-of-change of frequency protection SAPFRC .........................248
Identification.............................................................................. 248
Application................................................................................. 248
Setting guidelines...................................................................... 248
Frequency time accumulation protection function FTAQFVR........ 249
Identification.............................................................................. 249
Application................................................................................. 249
Setting guidelines...................................................................... 251
Section 11 Multipurpose protection................................................ 253
General current and voltage protection CVGAPC.......................... 253
Identification.............................................................................. 253
Application................................................................................. 253
Bay control REC670 2.2 IEC
Application manual