ABB RELION 670 Series Applications Manual page 10

Table of contents
Section 9 Voltage protection.............................................................................................. 149
9.1 Two step undervoltage protection UV2PTUV (27)......................................................................... 149
9.1.1 Identification.....................................................................................................................................149
9.1.2 Application........................................................................................................................................ 149
9.1.3 Setting guidelines............................................................................................................................ 150
9.1.3.1 Equipment protection, such as for motors and generators................................................150
9.1.3.2 Disconnected equipment detection......................................................................................... 150
9.1.3.3 Power supply quality ................................................................................................................... 150
9.1.3.4 Voltage instability mitigation.................................................................................................... 150
9.1.3.5 Backup protection for power system faults........................................................................... 150
9.1.3.6 Settings for Two step undervoltage protection.................................................................... 150
9.2 Two step overvoltage protection OV2PTOV (59)........................................................................... 152
9.2.1 Identification..................................................................................................................................... 152
9.2.2 Application.........................................................................................................................................152
9.2.3 Setting guidelines............................................................................................................................ 153
9.2.3.1 Equipment protection, such as for motors, generators, reactors and transformers.... 153
9.2.3.2 Equipment protection, capacitors............................................................................................ 154
9.2.3.3 Power supply quality.................................................................................................................... 154
9.2.3.4 High impedance grounded systems......................................................................................... 154
9.2.3.5 The following settings can be done for the two step overvoltage protection................ 154
Section 10 Frequency protection.......................................................................................... 157
10.1 Underfrequency protection SAPTUF (81).........................................................................................157
10.1.1 Identification..................................................................................................................................... 157
10.1.2 Application.........................................................................................................................................157
10.1.3 Setting guidelines............................................................................................................................ 157
10.2 Overfrequency protection SAPTOF (81)........................................................................................... 158
10.2.1 Identification.....................................................................................................................................158
10.2.2 Application.........................................................................................................................................158
10.2.3 Setting guidelines............................................................................................................................ 159
10.3 Rate-of-change frequency protection SAPFRC (81).......................................................................159
10.3.1 Identification.....................................................................................................................................159
10.3.2 Application.........................................................................................................................................159
10.3.3 Setting guidelines............................................................................................................................ 160
10.4 Frequency time accumulation protection function FTAQFVR (81A)...........................................161
10.4.1 Identification..................................................................................................................................... 161
10.4.2 Application......................................................................................................................................... 161
10.4.3 Setting guidelines............................................................................................................................ 163
Section 11 Multipurpose protection.....................................................................................165
11.1 General current and voltage protection CVGAPC.......................................................................... 165
11.1.1 Identification.....................................................................................................................................165
11.1.2 Application.........................................................................................................................................165
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Application manual