GE L90 Instruction Manual page 10

10. APPLICATION OF
SETTINGS
11. COMMISSIONING
x
TABLE OF CONTENTS
9.2 OPERATING CONDITION CHARACTERISTICS
9.2.1 DESCRIPTION .................................................................................................9-16
9.2.2 TRIP DECISION EXAMPLE .............................................................................9-18
9.2.3 TRIP DECISION TEST .....................................................................................9-18
9.3 SINGLE-POLE TRIPPING
9.3.1 OVERVIEW ......................................................................................................9-20
9.3.2 PHASE SELECTION ........................................................................................9-23
9.4 FAULT LOCATOR
9.4.1 OVERVIEW ......................................................................................................9-25
9.4.2 MULTI-ENDED FAULT LOCATOR...................................................................9-25
9.4.3 SINGLE-ENDED FAULT LOCATOR ................................................................9-31
10.1 CT REQUIREMENTS
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 POTT SIGNALING SCHEME
10.5.1 DESCRIPTION ...............................................................................................10-16
10.6 SERIES COMPENSATED LINES
10.6.1 DISTANCE SETTINGS ON SERIES COMPENSATED LINES ......................10-17
10.6.2 GROUND DIRECTIONAL OVERCURRENT ..................................................10-18
10.7 LINES WITH TAPPED TRANSFORMERS
10.7.1 DESCRIPTION ...............................................................................................10-19
10.7.2 TRANSFORMER LOAD CURRENTS ............................................................10-19
10.7.3 LV-SIDE FAULTS ...........................................................................................10-20
10.7.4 EXTERNAL GROUND FAULTS .....................................................................10-20
10.8 INSTANTANEOUS ELEMENTS
10.8.1 INSTANTANEOUS ELEMENT ERROR DURING L90 SYNCHRONIZATION ...10-
21
11.1 TESTING
11.1.1 CHANNEL TESTING ........................................................................................11-1
11.1.2 CLOCK SYNCHRONIZATION TESTS .............................................................11-2
11.1.3 CURRENT DIFFERENTIAL..............................................................................11-3
11.1.4 LOCAL-REMOTE RELAY TESTS ....................................................................11-4
L90 Line Current Differential System GE Multilin