6.1.4.3 Single busbar arrangements with sectionalizer...............................................................113
6.1.4.4 Single busbar arrangements with bus-section breaker................................................. 114
6.1.4.5 H-type busbar arrangements...............................................................................................115
6.1.4.6 Double circuit breaker busbar arrangement.....................................................................116
6.1.4.7 One-and-half circuit breaker.................................................................................................117
6.1.4.8 Double busbar single breaker arrangement..................................................................... 119
6.1.4.9 Double busbar arrangements with two bus-section breakers and two bus-
coupler breakers..................................................................................................................... 125
6.1.4.10 Combined busbar arrangements........................................................................................ 125
6.1.5 Six-zone busbar arrangements............................................................................................... 127
6.1.5.1 General...................................................................................................................................... 127
6.1.5.2 Typical arrangement which can be covered......................................................................128
6.1.5.3 Example engineering procedure......................................................................................... 129
6.1.6 Summation principle.................................................................................................................134
6.1.6.1 Introduction.............................................................................................................................134
6.1.6.2 Auxiliary summation CTs...................................................................................................... 136
6.1.6.3 Possible ASCT connections for REB670............................................................................. 137
6.1.6.4 Main CT ratio mismatch correction.................................................................................... 139
6.1.6.5 Primary pick-up levels for summation type differential protection ........................... 139
6.1.6.6 SLCE 8/ASCT characteristics for end-connection........................................................... 141
6.1.6.7 SLCE 8/ASCT characteristics for series-connection.......................................................142
Section 7 Current protection......................................................................................... 143
7.1 Directional phase overcurrent protection, four steps OC4PTOC........................................ 143
7.1.1 Identification.............................................................................................................................. 143
7.1.2 Application.................................................................................................................................. 143
7.1.3 Setting guidelines..................................................................................................................... 144
7.1.3.1 Settings for each step...........................................................................................................145
7.1.3.2 Setting example......................................................................................................................148
7.2 Four step single phase overcurrent protection PH4SPTOC ................................................. 152
7.2.1 Identification.............................................................................................................................. 152
7.2.2 Application.................................................................................................................................. 152
7.2.3 Setting guidelines......................................................................................................................153
7.2.3.1 Settings for each step (x = 1-4)............................................................................................153
7.2.3.2 Second harmonic restrain.................................................................................................... 155
7.3 Directional residual overcurrent protection, four steps EF4PTOC .....................................159
7.3.1 Identification..............................................................................................................................160
7.3.2 Setting guidelines..................................................................................................................... 160
7.3.2.1 Common settings for all steps............................................................................................160
7.3.2.2 2nd harmonic restrain........................................................................................................... 162
7.3.2.3 Parallel transformer inrush current logic...........................................................................162
7.3.2.4 Switch onto fault logic.......................................................................................................... 163
7.3.2.5 Settings for each step (x = 1, 2, 3 and 4)............................................................................ 163
7.4 Four step directional negative phase sequence overcurrent protection NS4PTOC ....... 165
7.4.1 Identification.............................................................................................................................. 165
7.4.2 Application.................................................................................................................................. 165
7.4.3 Setting guidelines......................................................................................................................167
Table of contents
Busbar protection REB670 3
Application manual
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