viii
L90 Line Current Differential System
GE Multilin
TABLE OF CONTENTS
DISTANCE CHARACTERISTICS.....................................................................9-21
DISTANCE ELEMENTS ANALYSIS.................................................................9-26
9.4 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
COMMUNICATIONS CHANNELS FOR PILOT-AIDED SCHEMES.................9-38
PERMISSIVE ECHO SIGNALING....................................................................9-46
PILOT SCHEME / PHASE SELECTOR COORDINATION...............................9-47
CROSS-COUNTRY FAULT EXAMPLE............................................................9-48
MULTI-ENDED FAULT LOCATOR...................................................................9-49
SINGLE-ENDED FAULT LOCATOR ................................................................9-55
10.1.1 INTRODUCTION ..............................................................................................10-1
10.1.2 CALCULATION EXAMPLE 1............................................................................10-1
10.1.3 CALCULATION EXAMPLE 2............................................................................10-2
10.2 CURRENT DIFFERENTIAL (87L) SETTINGS
10.2.1 INTRODUCTION ..............................................................................................10-3
10.2.2 CURRENT DIFFERENTIAL PICKUP ...............................................................10-3
10.2.3 CURRENT DIFF RESTRAINT 1.......................................................................10-3
10.2.4 CURRENT DIFF RESTRAINT 2.......................................................................10-3
10.2.5 CURRENT DIFF BREAK POINT ......................................................................10-3
10.2.6 CT TAP .............................................................................................................10-4
10.2.7 BREAKER-AND-A-HALF..................................................................................10-6
10.2.8 DISTRIBUTED BUS PROTECTION.................................................................10-9
10.3 CHANNEL ASYMMETRY COMPENSATION USING GPS
10.3.1 DESCRIPTION ...............................................................................................10-10
10.3.2 COMPENSATION METHOD 1 .......................................................................10-10
10.3.3 COMPENSATION METHOD 2 .......................................................................10-11
10.3.4 COMPENSATION METHOD 3 .......................................................................10-11
10.4 DISTANCE BACKUP/SUPERVISION
10.4.1 DESCRIPTION ...............................................................................................10-13
10.4.2 PHASE DISTANCE ........................................................................................10-14
10.4.3 GROUND DISTANCE.....................................................................................10-15
10.5 PROTECTION SIGNALING SCHEMES
10.5.1 OVERVIEW ....................................................................................................10-17
10.5.2 DIRECT UNDER-REACHING TRANSFER TRIP (DUTT) ..............................10-17
10.5.3 PERMISSIVE UNDER-REACHING TRANSFER TRIP (PUTT)......................10-17
10.5.4 PERMISSIVE OVER-REACHING TRANSFER TRIP (POTT) ........................10-17
10.5.5 HYBRID POTT SCHEME (HYB-POTT)..........................................................10-18
10.5.6 DIRECTIONAL COMPARISON BLOCKING...................................................10-19
10.5.7 DIRECTIONAL COMPARISON UNBLOCKING .............................................10-20
10.6.1 DISTANCE SETTINGS ON SERIES COMPENSATED LINES ......................10-22
10.6.2 GROUND DIRECTIONAL OVERCURRENT ..................................................10-23
10.7 LINES WITH TAPPED TRANSFORMERS
10.7.1 DESCRIPTION ...............................................................................................10-24
10.7.2 TRANSFORMER LOAD CURRENTS ............................................................10-24
10.7.3 LV-SIDE FAULTS ...........................................................................................10-25
10.7.4 EXTERNAL GROUND FAULTS .....................................................................10-25
Summary of Contents for UR Series L90
Page 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...