5-102
B90 Low Impedance Bus Differential System
GE Multilin
5.5 GROUPED ELEMENTS
5 SETTINGS
5
sends a cancel reclosure signal. Reclosure of a remote breaker can also be prevented by holding a Transfer Trip sig-
nal on longer than the "reclaim" time.
•
BF1 RETRIP TIME DELAY
: This setting is used to set a delay before asserting the re-trip operand.
•
BF1 CT
: This setting selects the currents that will be used in Breaker Failure scheme BF1 for current supervision (AMP
SUPV, HISET and LOSET elements).
•
BF1 AMP SUPV PICKUP
: This setting is used to set the phase current initiation and seal-in supervision level. Gener-
ally this setting should detect the lowest expected fault current on the protected breaker. It can be set as low as neces-
sary (lower than breaker resistor current or lower than load current). HiSet and LoSet current supervision will
guarantee correct operation.
•
BF1 AMP HISET PICKUP
: This setting is used to set the phase current fault detection level. Generally this setting
should detect the lowest expected fault current on the protected breaker, before a breaker-opening resistor is inserted.
•
BF1 AMP LOSET PICKUP
: This setting is used to set the phase current fault detection level. Generally this setting
should detect the lowest expected fault current on the protected breaker, after a breaker opening resistor is inserted
approximately 90% of resistor current).
Figure 5–44: BREAKER FAILURE CURRENT SUPERVISION LOGIC
Summary of Contents for B90 UR Series
Page 316: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 406: ...B 90 B90 Low Impedance Bus Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 436: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 446: ...D 10 B90 Low Impedance Bus Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...