2.8 Unbalanced Load Protection............................................................................................187
2.8.1 Functional Description...............................................................................................187
2.8.2 Setting Notes.............................................................................................................193
2.8.3 Settings.....................................................................................................................198
2.8.4 Information List.........................................................................................................199
2.9 Thermal Overload Protection...........................................................................................200
2.9.1 General..................................................................................................................... 200
2.9.2 Overload Protection Using a Thermal Replica..............................................................200
2.9.3 Overload protection using a thermal replica with ambient temperature influence.......202
2.9.4 Hot-Spot Calculation and Determination of the Ageing Rate ...................................... 203
2.9.5 Setting Notes.............................................................................................................205
2.9.6 Settings.....................................................................................................................209
2.9.7 Information List.........................................................................................................210
2.10 RTD-Boxes for Overload Detection................................................................................... 211
2.10.1 Functional Description...............................................................................................211
2.10.2 Setting Notes.............................................................................................................211
2.10.3 Settings.....................................................................................................................211
2.10.4 Information List.........................................................................................................216
2.11 Overexcitation Protection................................................................................................218
2.11.1 Functional Description...............................................................................................218
2.11.2 Setting Notes.............................................................................................................219
2.11.3 Settings.....................................................................................................................222
2.11.4 Information List.........................................................................................................222
2.12 Reverse Power Protection................................................................................................ 224
2.12.1 Functional Description...............................................................................................224
2.12.2 Setting Notes.............................................................................................................225
2.12.3 Settings.....................................................................................................................227
2.12.4 Information List.........................................................................................................228
2.13 Forward Power Supervision............................................................................................. 229
2.13.1 Functional Description...............................................................................................229
2.13.2 Setting Notes.............................................................................................................230
2.13.3 Settings.....................................................................................................................232
2.13.4 Information List.........................................................................................................232
2.14 Undervoltage Protection................................................................................................. 233
2.14.1 Functional Description...............................................................................................233
2.14.2 Setting Notes.............................................................................................................234
2.14.3 Settings.....................................................................................................................235
2.14.4 Information List.........................................................................................................235
2.15 Overvoltage Protection....................................................................................................236
2.15.1 Functional Description...............................................................................................236
2.15.2 Setting Notes.............................................................................................................237
2.15.3 Settings.....................................................................................................................237
2.15.4 Information List.........................................................................................................238
2.16 Frequency Protection...................................................................................................... 239
2.16.1 Functional Description...............................................................................................239
2.16.2 Setting Notes.............................................................................................................240
Table of Contents
SIPROTEC 4, 7UT6x, Manual 9
C53000-G1176-C230-5, Edition 09.2016
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