Siemens 7SG164 Ohmega 400 Series Manual page 17

Contents
1 Distance Protection Functions ......................................................................................... 4
1.1 Polarised MHO Characteristic................................................................................................ 4
1.1.1 Cross-Polarised MHO........................................................................................ 4
1.1.2 Offset Mho Characteristic .................................................................................. 5
1.1.3 Fault Configuration ............................................................................................ 5
1.1.4 Zone 3 Shaped Characteristics ......................................................................... 8
1.1.5 Comparison of Setting with THR Relay ............................................................. 9
1.2 Quadrilateral Characteristic.................................................................................................. 10
1.2.1 Cross-polarised Quadrilateral.......................................................................... 10
1.2.2 Offset Quadrilateral Characteristic .................................................................. 13
1.3 Voltage Memory ................................................................................................................... 14
1.4 Impedance Zones ................................................................................................................ 14
1.5 Single Pole / Three Pole Tripping (406 / 408 Only).............................................................. 14
1.6 Power Swing Characteristics ............................................................................................... 15
1.6.1 Applications ..................................................................................................... 15
1.6.2 Description of Operation.................................................................................. 16
1.6.3 Settings............................................................................................................ 16
1.7 Voltage Transformer Supervision (VTS) .............................................................................. 17
1.7.1 Applications. .................................................................................................... 17
1.7.2 Description of Operation.................................................................................. 17
1.7.3 General Operation ........................................................................................... 17
1.7.4 Settings............................................................................................................ 18
1.8 Switch On To Fault (SOTF).................................................................................................. 19
1.8.1 Applications ..................................................................................................... 19
1.8.2 Description of Operation.................................................................................. 19
1.8.3 Settings............................................................................................................ 20
2 Auxilary Functions.......................................................................................................... 21
2.1 Fault Locator ........................................................................................................................ 21
2.1.1 Applications ..................................................................................................... 21
2.1.2 Description of Operation.................................................................................. 21
2.1.3 Relay Settings.................................................................................................. 21
2.2 High Set Overcurrent ........................................................................................................... 21
2.2.1 Description of Operation.................................................................................. 21
2.2.2 Relay Settings.................................................................................................. 21
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7SG164 Ohmega 400 Series Impedance Functions
Chapter 2 Page 3 of 21