GE B30 Instruction Manual page 9

9. THEORY OF OPERATION
10. APPLICATION OF
SETTINGS
A. FLEXANALOG AND
FLEXINTEGER
PARAMETERS
B. MODBUS
COMMUNICATIONS
GE Multilin
TABLE OF CONTENTS
9.1 INTRODUCTION
9.1.1 BUS DIFFERENTIAL PROTECTION................................................................. 9-1
9.2 DYNAMIC BUS REPLICA
9.2.1 DYNAMIC BUS REPLICA MECHANISM ........................................................... 9-2
9.2.2 CT RATIO MATCHING ...................................................................................... 9-3
9.3 DIFFERENTIAL PRINCIPLE
9.3.1 BIASED DIFFERENTIAL CHARACTERISTIC ................................................... 9-4
9.3.2 DIFFERENTIAL AND RESTRAINING CURRENTS .......................................... 9-5
9.3.3 ENHANCED SECURITY .................................................................................... 9-6
9.4 DIRECTIONAL PRINCIPLE
9.4.1 CURRENT DIRECTIONAL PROTECTION ........................................................ 9-7
9.5 SATURATION DETECTOR
9.5.1 CT SATURATION DETECTION ........................................................................ 9-8
9.6 OUTPUT LOGIC AND EXAMPLES
9.6.1 OUTPUT LOGIC .............................................................................................. 9-10
9.6.2 INTERNAL AND EXTERNAL FAULT EXAMPLE ............................................ 9-10
10.1 OVERVIEW
10.1.1 INTRODUCTION................................................................................................ 9-1
10.1.2 SAMPLE BUSBAR AND DATA.......................................................................... 9-1
10.2 ZONING AND DYNAMIC BUS REPLICA
10.2.1 DESCRIPTION................................................................................................... 9-3
10.2.2 NORTH BUS ZONE ........................................................................................... 9-3
10.2.3 SOUTH BUS ZONE ........................................................................................... 9-4
10.3 BIASED CHARACTERISTIC BREAKPOINTS
10.3.1 DESCRIPTION................................................................................................... 9-5
10.3.2 HIGH BREAKPOINT .......................................................................................... 9-5
10.3.3 LOW BREAKPOINT........................................................................................... 9-6
10.4 SLOPES AND HIGH SET THRESHOLD
10.4.1 DESCRIPTION................................................................................................... 9-7
10.4.2 EXTERNAL FAULTS ON C-1 ............................................................................ 9-7
10.4.3 EXTERNAL FAULTS ON C-2 ............................................................................ 9-8
10.4.4 EXTERNAL FAULTS ON C-3 ............................................................................ 9-8
10.4.5 EXTERNAL FAULTS ON C-4 ............................................................................ 9-9
10.4.6 EXTERNAL FAULTS ON C-5 ............................................................................ 9-9
10.5 BUS DIFFERENTIAL SETTINGS
10.5.1 DESCRIPTION................................................................................................. 9-10
10.6 ENHANCING RELAY PERFORMANCE
10.6.1 USING SETTING GROUPS............................................................................. 9-11
A.1 PARAMETER LISTS
A.1.1 FLEXANALOG ITEMS .......................................................................................A-1
A.1.2 FLEXINTEGER ITEMS ....................................................................................A-10
B.1 MODBUS RTU PROTOCOL
B.1.1 INTRODUCTION................................................................................................B-1
B.1.2 PHYSICAL LAYER.............................................................................................B-1
B.1.3 DATA LINK LAYER............................................................................................B-1
B.1.4 CRC-16 ALGORITHM........................................................................................B-2
B.2 MODBUS FUNCTION CODES
B.2.1 SUPPORTED FUNCTION CODES ...................................................................B-3
B30 Bus Differential System ix