Schweitzer Engineering SEL-387-0 - Page 11

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
List of Figures
Figure B.14 Selecting New Firmware to Send to the Relay.....................................................................B.12
Figure B.15 Transferring New Firmware to the Relay.............................................................................B.12
Figure B.16 Preparing HyperTerminal for ID Command Display...........................................................B.16
Figure H.1 Transformer Nameplate......................................................................................................... H.3
Figure H.2 Three-Line Diagram Showing System Phase-to-Transformer Bushing, CT, and
CT-to-Relay Connections .................................................................................................. H.4
Figure H.3 Primary Current Phasors ....................................................................................................... H.4
Figure H.4 Current at the Relay Terminals.............................................................................................. H.4
Figure H.5 Standard System Phase-to-Transformer Bushing Connections............................................. H.6
Figure H.6 X- and H-Side Current Phasors for Figure H.5..................................................................... H.6
Figure H.7 Non-Standard System Phase-to-Transformer Bushing Connections .................................... H.7
Figure H.8 X- and H-Side Current Phasors for Figure H.7..................................................................... H.7
Figure H.9 Combination of Standard and Non-Standard Phase-to-Bushing Connection Diagram ........ H.8
Figure H.10 X- and H-Side Current Phasors for Figure H.9..................................................................... H.8
Figure H.11 Standard CT Connections...................................................................................................... H.9
Figure H.12 Primary System Currents and Currents as Seen by the Relay............................................... H.9
Figure H.13 Current Flow With Reversed X-Side CT Polarity............................................................... H.10
Figure H.14 Current Flow With Reversed X-Side CT Polarity and Reversed Connections ................... H.11
Figure H.15 Results of Reversed X-Side CT Polarity and Reversed Connections ................................. H.11
Figure H.16 Delta-Wye Transformer With Standard Phase-to-Bushing Connections ............................ H.13
Figure H.17 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.13
Figure H.18 Delta-Wye Transformer With Non-Standard Phase-to-Bushing Connections.................... H.14
Figure H.19 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.14
Figure H.20 Wye-Delta Transformer With Non-Standard CT Connections on the X-Side .................... H.15
Figure H.21 X- and H-Side Current Phasors for Figure H.20................................................................. H.15
Figure H.22 Comparison of Standard and Non-Standard CT Connections on the X-Side of the
Transformer .....................................................................................................................H.16
Figure H.23 Autotransformer With Standard Phase-to-Bushing Connections........................................ H.17
Figure H.24 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.17
Figure H.25 Delta-Wye Transformer With Standard Phase-to-Bushing Connections With an
ACB Phase Rotation ........................................................................................................ H.18
Figure H.26 X- and H-Side Current Phasors for Figure H.25................................................................. H.18
Figure H.27 Direction of Compensation Based on System Phase Rotation............................................ H.19
Figure H.28 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.19
Figure H.29 Common Transformer Connections .................................................................................... H.20