GE Multilin
L90 Line Current Differential System
10-9
10 APPLICATION OF SETTINGS
10.2 CURRENT DIFFERENTIAL (87L) SETTINGS
10
10.2.8 DISTRIBUTED BUS PROTECTION
In some cases, buses of the same substation are located quite far from each other or even separated by the line. In these
cases, it is challenging to apply conventional bus protection because of the CT cable length. In other cases, there are no
CTs available on the line side of the line to be protected. Taking full advantage of L90 capability to support up to 4 directly-
connected CTs, the relay can be applied to protect both line and buses as shown below. Proper CT/VT modules must be
ordered for such applications. The varying CT ratios at the breakers can be compensated locally by using the sources
mechanism and with the
CT TAP
settings between remote relays. If more than 4 but less than 8 CTs are to be connected to
the L90 at one bus, the 3-terminal system can be applied, provided the user does not exceed a total of 12 CTs.
Figure 10–2: DISTRIBUTED BUS PROTECTION
831787A1.CDR
Содержание UR Series L90
Страница 14: ...xiv L90 Line Current Differential System GE Multilin 0 1 BATTERY DISPOSAL 0 BATTERY DISPOSAL 0 ...
Страница 68: ...2 34 L90 Line Current Differential System GE Multilin 2 4 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 138: ...4 30 L90 Line Current Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 604: ...9 58 L90 Line Current Differential System GE Multilin 9 6 FAULT LOCATOR 9 THEORY OF OPERATION 9 ...
Страница 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Страница 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Страница 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Страница 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...