ABB Relion 670 series - Page 14

11.6.5.1 Function revision history...................................................................................................209
11.6.5.2 Check of undervoltage levels........................................................................................... 209
11.6.5.3 Check of voltage differential trip and alarm levels............................................................211
11.6.5.4 Check of trip and trip reset timers.................................................................................... 212
11.6.5.5 Final adjustment of compensation for VT ratio differences ............................................. 213
11.6.5.6 Completing the test.......................................................................................................... 213
11.6.6 Loss of voltage check LOVPTUV (27)...................................................................................213
11.6.6.1 Measuring the trip limit of set values................................................................................213
11.6.6.2 Completing the test.......................................................................................................... 214
11.7 Unbalance protection.............................................................................................................. 214
11.7.1 Shunt capacitor cascading failure protection SCCFPVOC (51 V).........................................214
11.7.1.1 Function revision history...................................................................................................214
11.7.1.2 Verifying the signals and settings.....................................................................................214
11.7.1.3 Completing the test.......................................................................................................... 216
11.7.2 Current unbalance protection of SCB, SCUCPTOC..............................................................216
11.7.2.1 Verifying the signals and settings.....................................................................................216
11.7.2.2 Completing the test.......................................................................................................... 220
11.7.3 Phase voltage differential based capacitor bank unbalanced protection, SCPDPTOV87V.. 220
11.7.3.1 Verifying the signals and settings.....................................................................................220
11.7.3.2 Completing the test.......................................................................................................... 226
11.7.4 Voltage unbalance protection of shunt capacitor bank, SCUVPTOV.................................... 226
11.7.4.1 Verifying the signals and settings.....................................................................................226
11.7.4.2 Completing the test.......................................................................................................... 228
11.8 Frequency protection...............................................................................................................228
11.8.1 Underfrequency protection SAPTUF (81)............................................................................. 228
11.8.1.1 Verifying the settings........................................................................................................ 228
11.8.1.2 Completing the test.......................................................................................................... 229
11.8.2 Overfrequency protection SAPTOF (81)............................................................................... 229
11.8.2.1 Verifying the settings........................................................................................................ 229
11.8.2.2 Completing the test.......................................................................................................... 230
11.8.3 Rate-of-change frequency protection SAPFRC (81).............................................................230
11.8.3.1 Verifying the settings........................................................................................................ 230
11.8.3.2 Completing the test.......................................................................................................... 231
11.9 Multipurpose protection........................................................................................................... 231
11.9.1 Function revision history........................................................................................................231
11.9.2 General current and voltage protection CVGAPC.................................................................231
11.9.2.1 Built-in overcurrent feature (non-directional)....................................................................232
11.9.2.2 Overcurrent feature with current restraint.........................................................................232
11.9.2.3 Overcurrent feature with voltage restraint........................................................................ 232
11.9.2.4 Overcurrent feature with directionality..............................................................................233
11.9.2.5 Over/Undervoltage feature...............................................................................................233
11.9.2.6 Completing the test.......................................................................................................... 234
11.10 Secondary system supervision................................................................................................234
Table of contents 1MRK 504 165-UUS Rev. J
8 Transformer protection RET670
Commissioning manual
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