GE b30 - Page 7

GE Multilin B30 Bus Differential System vii
TABLE OF CONTENTS
8.3 DIFFERENTIAL PRINCIPLE
8.3.1 BIASED DIFFERENTIAL CHARACTERISTIC................................................... 8-4
8.3.2 DIFFERENTIAL AND RESTRAINING CURRENTS .......................................... 8-5
8.3.3 ENHANCED SECURITY.................................................................................... 8-6
8.4 DIRECTIONAL PRINCIPLE
8.4.1 CURRENT DIRECTIONAL PROTECTION ........................................................ 8-7
8.5 SATURATION DETECTOR
8.5.1 CT SATURATION DETECTION ........................................................................ 8-8
8.6 OUTPUT LOGIC AND EXAMPLES
8.6.1 OUTPUT LOGIC .............................................................................................. 8-10
8.6.2 INTERNAL AND EXTERNAL FAULT EXAMPLE ............................................ 8-10
9. APPLICATION OF
SETTINGS
9.1 OVERVIEW
9.1.1 INTRODUCTION................................................................................................ 9-1
9.1.2 SAMPLE BUSBAR AND DATA.......................................................................... 9-1
9.2 ZONING AND DYNAMIC BUS REPLICA
9.2.1 DESCRIPTION................................................................................................... 9-3
9.2.2 NORTH BUS ZONE ........................................................................................... 9-3
9.2.3 SOUTH BUS ZONE ........................................................................................... 9-4
9.3 BIASED CHARACTERISTIC BREAKPOINTS
9.3.1 DESCRIPTION................................................................................................... 9-5
9.3.2 HIGH BREAKPOINT .......................................................................................... 9-5
9.3.3 LOW BREAKPOINT........................................................................................... 9-6
9.4 SLOPES AND HIGH SET THRESHOLD
9.4.1 DESCRIPTION................................................................................................... 9-7
9.4.2 EXTERNAL FAULTS ON C-1 ............................................................................ 9-7
9.4.3 EXTERNAL FAULTS ON C-2 ............................................................................ 9-9
9.4.4 EXTERNAL FAULTS ON C-3 ............................................................................ 9-9
9.4.5 EXTERNAL FAULTS ON C-4 .......................................................................... 9-10
9.4.6 EXTERNAL FAULTS ON C-5 .......................................................................... 9-10
9.5 BUS DIFFERENTIAL SETTINGS
9.5.1 DESCRIPTION................................................................................................. 9-11
9.6 ENHANCING RELAY PERFORMANCE
9.6.1 USING SETTING GROUPS............................................................................. 9-12
10. MAINTENANCE 10.1 MODULES
10.1.1 REPLACE A MODULE..................................................................................... 10-1
10.2 BATTERIES
10.2.1 REPLACE BATTERY....................................................................................... 10-3
10.2.2 DISPOSE OF BATTERY.................................................................................. 10-5
10.3 UNINSTALL AND CLEAR FILES AND DATA
10.3.1 UNINSTALL AND CLEAR FILES AND DATA.................................................. 10-8
10.4 REPAIRS
10.4.1 REPAIRS ......................................................................................................... 10-9
10.5 STORAGE
10.5.1 STORAGE...................................................................................................... 10-10
10.6 DISPOSAL
10.6.1 DISPOSAL ..................................................................................................... 10-11