Siemens 7SG11 Manual page 57

Contents
Section 1: Performance Specification.............................................................................................................6
1.1 General .............................................................................................................................................6
1.1.1 Conformity ....................................................................................................................6
1.1.2 Reference ............................................................................................................................6
1.1.3 Dimensions and Weights ......................................................................................................6
1.2 Energising Quantities.........................................................................................................................7
1.2.1 Characteristic Energising Quantities......................................................................................7
1.2.2 Auxiliary Energising Quantity ................................................................................................8
1.3 Output Contacts.................................................................................................................................9
1.4 Functional Performance .....................................................................................................................9
1.4.1 Phase-fault Overcurrent Protection .......................................................................................9
1.4.2 Earth-fault Overcurrent Protection.......................................................................................11
1.4.3 Sensitive/Restricted Earth-fault Protection...........................................................................11
1.4.4 Directional Characteristics ..................................................................................................11
1.4.5 Circuit Breaker Fail.............................................................................................................12
1.4.6 Auto-reclose.......................................................................................................................13
1.4.7 Instrumentation ..................................................................................................................13
1.4.8 Communication Interface....................................................................................................13
1.4.9 Real Time Clock.................................................................................................................13
1.5 Environmental Performance.............................................................................................................13
1.5.1 General..............................................................................................................................13
1.5.2 Immunity............................................................................................................................14
1.5.3 Emissions ..........................................................................................................................15
1.5.4 Mechanical ........................................................................................................................15
Section 2: Functional Description .................................................................................................................20
2.1 Introduction .....................................................................................................................................20
2.1.1 Models...............................................................................................................................21
2.1.2 Document Organisation......................................................................................................21
2.2 Configuration...................................................................................................................................22
2.2.1 Settings Groups .................................................................................................................22
2.2.2 System Frequency .............................................................................................................22
2.2.3 Current and Voltage Inputs .................................................................................................23
2.2.4 Identifier.............................................................................................................................24
2.2.5 General Alarms ..................................................................................................................24
2.2.6 Direction Tags....................................................................................................................24
2.2.7 Real Time Clock.................................................................................................................25
2.2.8 Default Instruments ............................................................................................................25
2.2.9 Password...........................................................................................................................25
2.3 Phase-fault and Earth-fault Overcurrent............................................................................................26
2.3.1 Delay Characteristic element ..............................................................................................26
2.3.2 Instantaneous elements......................................................................................................27
2.3.3 Flashing (Pecking) Fault Protection.....................................................................................29
2.4 Sensitive Earth-fault and Restricted Earth-fault .................................................................................30
2.4.1 High Impedance Restricted Earth-fault Scheme ..................................................................31
2.5 Primary Equipment Fail Protection ...................................................................................................31
2.5.1 Circuit Breaker (Trip) Fail Protection ...................................................................................31
2.5.2 Close Fail...........................................................................................................................32
2.5.3 Current Transformer Failure ...............................................................................................32
2.5.4 Trip Circuit Supervision - for details see sections 2.10 and 3.8 ............................................33
2.6 Cold Load Protection .......................................................................................................................33
2.7 Directional Control ...........................................................................................................................34
2.7.1 Polarisation........................................................................................................................34
2.7.2 Two-out-of-three Gate ........................................................................................................35
2.7.3 Voltage Memory.................................................................................................................35
2.8 Voltage Protection ...........................................................................................................................36
2.9 Auto-Reclose...................................................................................................................................37
2.9.1 Auto Reclose Sequences ...................................................................................................38
2.9.2 Control Inputs.....................................................................................................................43
2.9.3 Frequent Operations Counter .............................................................................................44
©2013 Siemens Protection Devices Limited
7SG11 Argus Technical Reference
P20007 Page 2 of 71