Hitachi Relion 670 Series Applications Manual page 10

Table of contents
8.7.1 Identification.......................................................................................................................... 147
8.7.2 Application.............................................................................................................................147
8.7.3 Setting guidelines.................................................................................................................. 149
Section 9 Voltage protection...........................................................................................153
9.1 Two step undervoltage protection UV2PTUV (27).................................................................. 153
9.1.1 Identification.......................................................................................................................... 153
9.1.2 Application.............................................................................................................................153
9.1.3 Setting guidelines.................................................................................................................. 153
9.1.3.1
9.1.3.2
9.1.3.3
9.1.3.4
9.1.3.5
9.1.3.6
9.2 Two step overvoltage protection OV2PTOV (59).................................................................... 155
9.2.1 Identification.......................................................................................................................... 156
9.2.2 Application.............................................................................................................................156
9.2.3 Setting guidelines.................................................................................................................. 156
9.2.3.1
9.2.3.2
9.2.3.3
9.2.3.4
9.2.3.5
Section 10 Frequency protection..................................................................................... 161
10.1 Underfrequency protection SAPTUF (81)............................................................................... 161
10.1.1 Identification.......................................................................................................................... 161
10.1.2 Application.............................................................................................................................161
10.1.3 Setting guidelines.................................................................................................................. 161
10.2 Overfrequency protection SAPTOF (81)................................................................................. 162
10.2.1 Identification.......................................................................................................................... 162
10.2.2 Application.............................................................................................................................162
10.2.3 Setting guidelines.................................................................................................................. 162
10.3 Rate-of-change of frequency protection SAPFRC (81)........................................................... 163
10.3.1 Identification.......................................................................................................................... 163
10.3.2 Application.............................................................................................................................163
10.3.3 Setting guidelines.................................................................................................................. 164
10.4 Frequency time accumulation protection function FTAQFVR (81A) .......................................164
10.4.1 Identification.......................................................................................................................... 164
10.4.2 Application.............................................................................................................................165
10.4.3 Setting guidelines.................................................................................................................. 166
Section 11 Multipurpose protection.................................................................................169
4
Equipment protection, such as for motors and generators...............................................154
Disconnected equipment detection.................................................................................. 154
Power supply quality ....................................................................................................... 154
Voltage instability mitigation............................................................................................. 154
Backup protection for power system faults.......................................................................154
Settings for two step undervoltage protection.................................................................. 154
Equipment protection, such as for motors, generators, reactors and transformers......... 157
Equipment protection, capacitors..................................................................................... 157
Power supply quality........................................................................................................ 157
High impedance grounded systems................................................................................. 157
The following settings can be done for the two step overvoltage protection.................... 157
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1MRK511407-UUS Rev. N
Phasor measurement unit RES670
Application manual