ABB RELION 650 Series Applications Manual page 9

6.2.3.4 Internal/external fault discriminator................................................................................... 86
6.2.3.5 Power transformer in the protected zone.......................................................................... 87
6.2.3.6 Settings examples................................................................................................................... 90
Section 7 Impedance protection....................................................................................101
7.1 Distance protection ZMFPDIS..................................................................................................... 101
7.1.1 Identification.............................................................................................................................. 101
7.1.2 Application.................................................................................................................................. 101
7.1.2.1 System earthing......................................................................................................................101
7.1.2.2 Fault infeed from remote end............................................................................................. 104
7.1.2.3 Load encroachment...............................................................................................................105
7.1.2.4 Short line application............................................................................................................ 106
7.1.2.5 Long transmission line application.................................................................................... 106
7.1.2.6 Parallel line application with mutual coupling..................................................................107
7.1.2.7 Tapped line application......................................................................................................... 112
7.1.3 Setting guidelines...................................................................................................................... 114
7.1.3.1 General...................................................................................................................................... 114
7.1.3.2 Setting of zone 1..................................................................................................................... 115
7.1.3.3 Setting of overreaching zone............................................................................................... 115
7.1.3.4 Setting of reverse zone..........................................................................................................116
7.1.3.5 Setting of zones for parallel line application.................................................................... 116
7.1.3.6 Setting the reach with respect to load...............................................................................118
7.1.3.7 Zone reach setting lower than minimum load impedance............................................ 118
7.1.3.8 Zone reach setting higher than minimum load impedance.......................................... 120
7.1.3.9 Other settings......................................................................................................................... 121
7.2 Automatic switch onto fault logic ZCVPSOF ...........................................................................124
7.2.1 Identification.............................................................................................................................. 124
7.2.2 Application.................................................................................................................................. 124
7.2.3 Setting guidelines......................................................................................................................125
Section 8 Current protection..........................................................................................127
8.1 Instantaneous phase overcurrent protection PHPIOC .......................................................... 127
8.1.1 Identification.............................................................................................................................. 127
8.1.2 Application.................................................................................................................................. 127
8.1.3 Setting guidelines...................................................................................................................... 127
8.1.3.1 Meshed network without parallel line................................................................................ 128
8.1.3.2 Meshed network with parallel line...................................................................................... 130
8.2 Four step phase overcurrent protection OC4PTOC................................................................ 131
8.2.1 Identification...............................................................................................................................131
8.2.2 Application...................................................................................................................................131
8.2.3 Setting guidelines......................................................................................................................132
8.2.3.1 Settings for each step........................................................................................................... 133
8.2.3.2 2nd harmonic restrain........................................................................................................... 136
8.3 Instantaneous residual overcurrent protection EFPIOC .......................................................140
8.3.1 Identification.............................................................................................................................. 141
8.3.2 Application.................................................................................................................................. 141
8.3.3 Setting guidelines...................................................................................................................... 141
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