ABB RELION 670 Series Applications Manual page 11

Section 8 Voltage protection.............................................................................................. 201
8.1 Two step undervoltage protection UV2PTUV (27)......................................................................... 201
8.1.1 Identification.....................................................................................................................................201
8.1.2 Setting guidelines............................................................................................................................ 201
8.1.2.1 Equipment protection, such as for motors and generators................................................ 201
8.1.2.2 Disconnected equipment detection......................................................................................... 201
8.1.2.3 Power supply quality ................................................................................................................... 202
8.1.2.4 Voltage instability mitigation.................................................................................................... 202
8.1.2.5 Backup protection for power system faults........................................................................... 202
8.1.2.6 Settings for Two step undervoltage protection.................................................................... 202
8.2 Two step overvoltage protection OV2PTOV (59).......................................................................... 204
8.2.1 Identification.................................................................................................................................... 204
8.2.2 Application........................................................................................................................................ 204
8.2.3 Setting guidelines............................................................................................................................205
8.2.3.1 Equipment protection, such as for motors, generators, reactors and transformers....205
8.2.3.2 Equipment protection, capacitors............................................................................................205
8.2.3.3 Power supply quality....................................................................................................................205
8.2.3.4 High impedance grounded systems.........................................................................................205
8.2.3.5 The following settings can be done for the two step overvoltage protection................206
8.3 Two step residual overvoltage protection ROV2PTOV (59N)......................................................207
8.3.1 Identification.................................................................................................................................... 207
8.3.2 Application........................................................................................................................................ 207
8.3.3 Setting guidelines............................................................................................................................208
8.3.3.1 Equipment protection, such as for motors, generators, reactors and transformers....208
8.3.3.2 Equipment protection, capacitors............................................................................................208
8.3.3.3 Power supply quality....................................................................................................................208
8.3.3.4 High impedance grounded systems.........................................................................................209
8.3.3.5 Direct grounded system..............................................................................................................210
8.3.3.6 Settings for Two step residual overvoltage protection........................................................ 211
8.4 Voltage differential protection VDCPTOV (60)...............................................................................213
8.4.1 Identification..................................................................................................................................... 213
8.4.2 Application.........................................................................................................................................213
8.4.3 Setting guidelines............................................................................................................................ 214
8.5 Loss of voltage check LOVPTUV (27)................................................................................................ 215
8.5.1 Identification..................................................................................................................................... 215
8.5.2 Application.........................................................................................................................................215
8.5.3 Setting guidelines............................................................................................................................ 215
8.5.3.1 Advanced users settings............................................................................................................. 215
Section 9 Frequency protection.......................................................................................... 217
9.1 Underfrequency protection SAPTUF (81)......................................................................................... 217
9.1.1 Identification..................................................................................................................................... 217
Application manual
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