ABB RELION 670 Series Applications Manual page 11

7.4.2.4 Load encroachment............................................................................................................... 223
7.4.2.5 Short line application............................................................................................................ 224
7.4.2.6 Long transmission line application.................................................................................... 225
7.4.2.7 Parallel line application with mutual coupling..................................................................225
7.4.2.8 Tapped line application........................................................................................................ 229
7.4.3 Setting guidelines......................................................................................................................231
7.4.3.1 General......................................................................................................................................231
7.4.3.2 Setting of zone 1.....................................................................................................................232
7.4.3.3 Setting of zone 2.....................................................................................................................232
7.4.3.4 Setting of zone 3.....................................................................................................................232
7.4.3.5 Setting of overreaching zone...............................................................................................232
7.4.3.6 Setting of reverse zone......................................................................................................... 233
7.4.3.7 Load impedance limitation, without load encroachment function............................. 239
7.4.3.8 Load impedance limitation, with load encroachment function activated.................240
7.4.3.9 Setting of minimum operate currents.............................................................................. 240
7.4.3.10 Setting of directional mode................................................................................................. 241
7.4.3.11 Setting of direction for offset mho.................................................................................... 241
7.4.3.12 Setting of timers for distance protection zones............................................................. 241
7.5 Full-scheme distance protection, quadrilateral for earth faults ZMMPDIS, ZMMAPDIS. 242
7.5.1 Identification..............................................................................................................................242
7.5.2 Application..................................................................................................................................242
7.5.2.1 Introduction............................................................................................................................ 242
7.5.2.2 System earthing..................................................................................................................... 242
7.5.2.3 Fault infeed from remote end............................................................................................. 245
7.5.2.4 Load encroachment...............................................................................................................246
7.5.2.5 Short line application............................................................................................................ 247
7.5.2.6 Long transmission line application.................................................................................... 247
7.5.2.7 Parallel line application with mutual coupling................................................................. 248
7.5.2.8 Tapped line application........................................................................................................ 253
7.5.3 Setting guidelines..................................................................................................................... 255
7.5.3.1 General..................................................................................................................................... 255
7.5.3.2 Setting of zone1......................................................................................................................255
7.5.3.3 Setting of overreaching zone.............................................................................................. 255
7.5.3.4 Setting of reverse zone.........................................................................................................256
7.5.3.5 Setting of zones for parallel line application....................................................................256
7.5.3.6 Setting of reach in resistive direction............................................................................... 258
7.5.3.7 Load impedance limitation, without load encroachment function.............................258
7.5.3.8 Load impedance limitation, with load encroachment function activated................. 259
7.5.3.9 Setting of minimum operating currents........................................................................... 259
7.5.3.10 Setting of timers for distance protection zones.............................................................260
7.6 Additional distance protection directional function for earth faults ZDARDIR................260
7.6.1 Identification..............................................................................................................................260
7.6.2 Application................................................................................................................................. 260
7.6.3 Setting guidelines..................................................................................................................... 260
7.7 Mho impedance supervision logic ZSMGAPC...........................................................................262
7.7.1 Identification.............................................................................................................................. 262
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