ABB Relion 670 Series Applications Manual page 9

6.1.4 Setting guidelines.............................................................................................................................112
6.1.4.1 Configuration................................................................................................................................. 112
6.1.4.2 Settings of protection function..................................................................................................112
6.1.4.3 T-feeder protection.......................................................................................................................113
6.1.4.4 Tertiary reactor protection......................................................................................................... 116
6.1.4.5 Alarm level operation....................................................................................................................118
Section 7 Current protection............................................................................................... 119
7.1 Instantaneous phase overcurrent protection PHPIOC (50)......................................................... 119
7.1.1 Identification..................................................................................................................................... 119
7.1.2 Application......................................................................................................................................... 119
7.1.3 Setting guidelines.............................................................................................................................119
7.1.3.1 Meshed network without parallel line.......................................................................................120
7.1.3.2 Meshed network with parallel line............................................................................................. 122
7.2 Four step phase overcurrent protection OC4PTOC(51/67)......................................................... 123
7.2.1 Identification.....................................................................................................................................124
7.2.2 Application.........................................................................................................................................124
7.2.3 Setting guidelines............................................................................................................................ 125
7.2.3.1 Settings for each step..................................................................................................................126
7.2.3.2 2nd harmonic restrain.................................................................................................................. 129
7.3 Instantaneous residual overcurrent protection EFPIOC (50N)................................................... 134
7.3.1 Identification.....................................................................................................................................134
7.3.2 Application.........................................................................................................................................134
7.3.3 Setting guidelines............................................................................................................................ 134
7.4 Four step residual overcurrent protection, (Zero sequence or negative sequence
directionality) EF4PTOC (51N/67N).................................................................................................. 136
7.4.1 Identification..................................................................................................................................... 137
7.4.2 Application......................................................................................................................................... 137
7.4.3 Setting guidelines............................................................................................................................ 139
7.4.3.1 Settings for each step (x = 1, 2, 3 and 4)...................................................................................139
7.4.3.2 Common settings for all steps................................................................................................... 141
7.4.3.3 2nd harmonic restrain..................................................................................................................142
7.4.3.4 Parallel transformer inrush current logic................................................................................. 143
7.4.3.5 Switch onto fault logic................................................................................................................. 143
7.4.3.6 Line application example............................................................................................................ 144
7.5 Four step directional negative phase sequence overcurrent protection NS4PTOC (46I2)... 149
7.5.1 Identification.....................................................................................................................................149
7.5.2 Application........................................................................................................................................ 149
7.5.3 Setting guidelines............................................................................................................................ 150
7.5.3.1 Settings for each step ................................................................................................................. 151
7.5.3.2 Common settings for all steps...................................................................................................153
7.6 Sensitive directional residual overcurrent and power protection SDEPSDE (67N).................154
7.6.1 Identification.....................................................................................................................................154
Application manual
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