GE B30 Instruction Manual page 8

9 THEORY OF
OPERATION
10 MAINTENANCE
viii
8.3.1 Description ...............................................................................................................................8-5
8.3.2 High breakpoint .....................................................................................................................8-6
8.3.3 Low breakpoint ......................................................................................................................8-6
8.4 Slopes and high set threshold..............................................................................8-7
8.4.1 Description ...............................................................................................................................8-7
8.4.2 External faults on C-1 .........................................................................................................8-7
8.4.3 External faults on C-2 .........................................................................................................8-9
8.4.4 External faults on C-3 .........................................................................................................8-9
8.4.5 External faults on C-4 ...................................................................................................... 8-10
8.4.6 External faults on C-5 ...................................................................................................... 8-10
8.5 Bus differential settings ......................................................................................8-11
8.5.1 Description ............................................................................................................................ 8-11
8.6 Enhancing relay performance............................................................................8-12
8.6.1 Using setting groups ........................................................................................................ 8-12
9.1 Introduction.............................................................................................................9-1
9.1.1 Bus differential protection ................................................................................................9-1
9.2 Dynamic bus replica ..............................................................................................9-3
9.2.1 Dynamic bus replica mechanism..................................................................................9-3
9.2.2 CT ratio matching .................................................................................................................9-4
9.3 Differential principle ..............................................................................................9-5
9.3.1 Biased differential characteristic...................................................................................9-5
9.3.2 Differential and restraining currents ...........................................................................9-6
9.3.3 Enhanced security................................................................................................................9-6
9.4 Directional principle...............................................................................................9-7
9.4.1 Current directional protection ........................................................................................9-7
9.5 Saturation detector................................................................................................9-9
9.5.1 CT saturation detection......................................................................................................9-9
9.6 Output logic and examples.................................................................................9-10
9.6.1 Output logic .......................................................................................................................... 9-10
9.6.2 Internal and external fault example ......................................................................... 9-11
10.1 Monitoring .............................................................................................................10-1
10.1.1 Devices with Site Targets ............................................................................................... 10-1
10.1.2 Data with Modbus Analyzer.......................................................................................... 10-1
10.2 General maintenance ..........................................................................................10-3
10.2.1 In-service maintenance.................................................................................................. 10-3
10.2.2 Out-of-service maintenance ........................................................................................ 10-3
10.2.3 Unscheduled maintenance (system interruption) .............................................. 10-3
10.3 Retrieve files ..........................................................................................................10-3
10.3.1 CyberSentry security event files.................................................................................. 10-4
10.4 Convert device settings.......................................................................................10-5
10.5 Copy settings to other device ............................................................................10-7
10.6 Compare settings .................................................................................................10-7
10.6.1 Compare against defaults ............................................................................................. 10-7
10.6.2 Compare two devices ...................................................................................................... 10-8
10.7 Back up and restore settings .............................................................................10-8
10.7.1 Back up settings .................................................................................................................10-8
10.7.2 Restore settings ............................................................................................................... 10-11
10.8 Upgrade software.............................................................................................. 10-13
10.9 Upgrade firmware ............................................................................................. 10-14
10.10 Replace front panel ........................................................................................... 10-15
10.11 Replace module ................................................................................................. 10-23
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
TABLE OF CONTENTS