10-6
L90 Line Current Differential System
GE Multilin
10.2 CURRENT DIFFERENTIAL (87L) SETTINGS
10 APPLICATION OF SETTINGS
10
10.2.7 BREAKER-AND-A-HALF
Assume a breaker-and-the-half configuration shown in the figure below. This section provides guidance on configuring the
L90 relay for this application. The L90 is equipped with two CT/VT modules: F8F and L8F.
1.
CTs and VTs are connected to L90 CT/VT modules as follows:
– CT1 circuitry is connected to the F1 to F3 terminals of the F8F module (three-phase CT inputs, CT bank “F”).
– CT2 circuitry is connected to the F1 to F3 terminals of the L8F module (three-phase CT inputs, CT bank “L”).
– VT1 circuitry is connected to the F8 terminals of the F8F module (single-phase VT for synchrocheck 1, VT bank “F”).
– VT2 circuitry is connected to the F8 terminals of the L8F module (single-phase VT for synchrocheck 2, VT bank “L”).
– VT3 circuitry is connected to the F5 to F7 terminals of the F8F modules (three-phase VT for distance, metering, syn-
chrocheck, charging current compensation, etc.; VT bank “F”).
Figure 10–1: BREAKER-AND-A-HALF APPLICATION
2.
The CTs and VTs are configured according to the following ratios and connections (EnerVista UR Setup example
shown):
Summary of Contents for UR Series L90
Page 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...
