ABB Relion 620 Series - Page 19

10.3.3 Functionality......................................................................................................................1089
10.3.4 Operation principle.......................................................................................................... 1090
10.3.5 Recorded data................................................................................................................... 1098
10.3.6 Application......................................................................................................................... 1100
10.3.7 Signals................................................................................................................................. 1102
10.3.8 Settings............................................................................................................................... 1102
10.3.9 Monitored data.................................................................................................................. 1105
10.3.10 Technical data ................................................................................................................... 1107
10.4 Voltage unbalance VSQVUB............................................................................................................ 1108
10.4.1 Identification......................................................................................................................1108
10.4.2 Function block................................................................................................................... 1108
10.4.3 Functionality...................................................................................................................... 1108
10.4.4 Operation principle...........................................................................................................1109
10.4.5 Application.......................................................................................................................... 1113
10.4.6 Signals..................................................................................................................................1114
10.4.7 Settings................................................................................................................................1115
10.4.8 Monitored data.................................................................................................................. 1116
10.4.9 Technical data ....................................................................................................................1117
11 General function block features........................................................ 1118
11.1 Definite time characteristics........................................................................................................... 1118
11.1.1 Definite time operation.................................................................................................... 1118
11.2 Current based inverse definite minimum time characteristics................................................1122
11.2.1 IDMT curves for overcurrent protection....................................................................... 1122
11.2.2 Reset in inverse-time modes...........................................................................................1143
11.2.3 Inverse-timer freezing...................................................................................................... 1153
11.3 Voltage based inverse definite minimum time characteristics............................................... 1153
11.3.1 IDMT curves for overvoltage protection.......................................................................1153
11.3.2 IDMT curves for undervoltage protection....................................................................1160
11.4 Frequency measurement and protection ....................................................................................1164
11.5 Measurement modes........................................................................................................................1165
11.6 Calculated measurements...............................................................................................................1166
12 Requirements for measurement transformers............................... 1169
12.1 Current transformers....................................................................................................................... 1169
12.1.1 Current transformer requirements for overcurrent protection.............................. 1169
13 IED physical connections.................................................................... 1173
13.1 Module slot numbering.....................................................................................................................1173
13.2 Protective earth connections ......................................................................................................... 1173
13.3 Binary and analog connections.......................................................................................................1174
13.4 Communication connections.......................................................................................................... 1174
Contents
620 series
Technical Manual
19