GE D30 Instruction Manual page 8

8 APPLICATION OF
SETTINGS
9 THEORY OF
OPERATION
10 MAINTENANCE
viii
8.1 Application guidelines ...........................................................................................8-1
8.1.1 Overview ...................................................................................................................................8-1
8.1.2 Impact of memory polarization .....................................................................................8-1
8.1.3 High set overcurrent elements.......................................................................................8-1
8.2 Distance elements (stepped distance scheme).................................................8-2
8.2.1 Phase distance.......................................................................................................................8-2
8.2.2 Ground distance....................................................................................................................8-3
8.3 Series compensated lines .....................................................................................8-5
8.3.1 Overview ...................................................................................................................................8-5
8.3.2 Distance.....................................................................................................................................8-6
8.3.3 Ground directional overcurrent .....................................................................................8-7
8.3.4 High-set phase overcurrent.............................................................................................8-7
8.4 Phase distance through power transformers ...................................................8-8
8.4.1 Phase distance protection................................................................................................8-8
8.4.2 Example.....................................................................................................................................8-9
9.1 Distance elements..................................................................................................9-1
9.1.1 Overview ...................................................................................................................................9-1
9.1.2 Phasor estimation.................................................................................................................9-2
9.1.3 Distance characteristics ....................................................................................................9-2
9.1.4 Fast distance algorithm .....................................................................................................9-7
9.1.5 Memory polarization ...........................................................................................................9-7
9.1.6 Distance elements analysis .............................................................................................9-9
9.2 Phase distance applied to power transformers .............................................9-11
9.2.1 Description ............................................................................................................................ 9-11
9.2.2 Example.................................................................................................................................. 9-15
9.3 Ground directional overcurrent.........................................................................9-17
9.3.1 Description ............................................................................................................................ 9-17
9.3.2 Example.................................................................................................................................. 9-18
9.4 Series compensated lines ...................................................................................9-18
9.4.1 Description ............................................................................................................................ 9-18
9.5 Fault locator ..........................................................................................................9-22
9.5.1 Fault type determination................................................................................................ 9-22
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
D30 LINE DISTANCE PROTECTION SYSTEM - INSTRUCTION MANUAL
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