
5-122
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 5–47: BREAKER FAILURE CURRENT SUPERVISION LOGIC
Summary of Contents for B90
Page 10: ...x B90 Low Impedance Bus Differential System GE Multilin TABLE OF CONTENTS ...
Page 284: ...5 166 B90 Low Impedance Bus Differential System GE Multilin 5 8 TESTING 5 SETTINGS 5 ...
Page 334: ...10 8 B90 Low Impedance Bus Differential System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Page 338: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 460: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 476: ...E 10 B90 Low Impedance Bus Differential System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 502: ...viii B90 Low Impedance Bus Differential System GE Multilin INDEX ...