GE D90 Plus Instruction Manual page 8

16 MAINTENANCE
17 APPENDIX
viii
Phase distance applied to power transformers .................................................. 553
Example system with power transformers...................................................................................556
Ground directional overcurrent theory................................................................. 558
Ground directional overcurrent example ......................................................................................559
Series compensated lines ........................................................................................ 559
Memory polarized directional comparators.................................................................................560
Dynamic reach control...........................................................................................................................561
Single-pole tripping................................................................................................... 563
SLG fault scenario for single-pole tripping....................................................................................565
SLG fault evolving into an LLG fault scenario for single-pole tripping.............................566
Phase selection ..........................................................................................................................................567
Communications channels for pilot-aided schemes ...............................................................568
Permissive echo signaling.....................................................................................................................575
Pilot scheme and phase selector coordination ..........................................................................576
Cross-country fault example...............................................................................................................577
General maintenance ............................................................................................... 579
Back up and restore settings .................................................................................. 579
Back up settings ........................................................................................................................................579
Restore settings .........................................................................................................................................580
Upgrade software...................................................................................................... 580
Upgrade firmware ..................................................................................................... 581
Uninstall and clear files and data .......................................................................... 582
Repairs......................................................................................................................... 582
Storage ........................................................................................................................ 582
Disposal....................................................................................................................... 583
Warranty..................................................................................................................... 585
Revision history ......................................................................................................... 585
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM - INSTRUCTION MANUAL
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