GE b30 Instruction Manual page 8

9 THEORY OF
OPERATION
10 MAINTENANCE
A FLEXANALOG
OPERANDS
viii
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 Compare settings ..........................................................................................10-5
10.4.1 Compare against defaults ............................................................................................. 10-5
10.4.2 Compare two devices ...................................................................................................... 10-5
10.5 Back up and restore settings.......................................................................10-6
10.5.1 Back up settings .................................................................................................................10-6
10.5.2 Restore settings .................................................................................................................. 10-8
10.6 Upgrade software........................................................................................10-10
10.7 Upgrade firmware .......................................................................................10-11
10.8 Replace module............................................................................................10-12
10.9 Battery ...........................................................................................................10-14
10.9.1 Replace battery for SH/SL power supply ............................................................. 10-14
10.9.2 Dispose of battery .......................................................................................................... 10-15
10.10 Uninstall and clear files and data.............................................................10-18
10.11 Repairs...........................................................................................................10-19
10.12 Storage ..........................................................................................................10-19
10.13 Disposal .........................................................................................................10-20
A.1 FlexAnalog items .............................................................................................A-1
B30 BUS DIFFERENTIAL SYSTEM - INSTRUCTION MANUAL
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