GE L90 Instruction Manual page 9

9. APPLICATION OF
SETTINGS
10. COMMISSIONING
A. FLEXANALOG
PARAMETERS
GE Multilin
TABLE OF CONTENTS
8.1.17 CT SATURATION DETECTION ...................................................................... 8-12
8.1.18 CHARGING CURRENT COMPENSATION ..................................................... 8-13
8.1.19 DIFFERENTIAL ELEMENT CHARACTERISTICS........................................... 8-14
8.1.20 RELAY SYNCHRONIZATION.......................................................................... 8-15
8.2 OPERATING CONDITION CHARACTERISTICS
8.2.1 DESCRIPTION................................................................................................. 8-16
8.2.2 TRIP DECISION EXAMPLE............................................................................. 8-18
8.2.3 TRIP DECISION TEST .................................................................................... 8-18
9.1 CT REQUIREMENTS
9.1.1 INTRODUCTION................................................................................................ 9-1
9.1.2 CALCULATION EXAMPLE 1 ............................................................................. 9-2
9.1.3 CALCULATION EXAMPLE 2 ............................................................................. 9-2
9.2 CURRENT DIFFERENTIAL (87L) SETTINGS
9.2.1 INTRODUCTION................................................................................................ 9-3
9.2.2 CURRENT DIFF PICKUP .................................................................................. 9-3
9.2.3 CURRENT DIFF RESTRAINT 1 ........................................................................ 9-3
9.2.4 CURRENT DIFF RESTRAINT 2 ........................................................................ 9-3
9.2.5 CURRENT DIFF BREAK POINT ....................................................................... 9-3
9.2.6 CT TAP .............................................................................................................. 9-4
9.2.7 BREAKER-AND-A-HALF ................................................................................... 9-5
9.2.8 DISTRIBUTED BUS PROTECTION .................................................................. 9-7
9.3 CHANNEL ASYMMETRY COMPENSATION USING GPS
9.3.1 DESCRIPTION................................................................................................... 9-8
9.3.2 COMPENSATION METHOD 1 .......................................................................... 9-8
9.3.3 COMPENSATION METHOD 2 .......................................................................... 9-9
9.3.4 COMPENSATION METHOD 3 .......................................................................... 9-9
9.4 DISTANCE BACKUP/SUPERVISION
9.4.1 DESCRIPTION................................................................................................. 9-11
9.4.2 PHASE DISTANCE.......................................................................................... 9-12
9.4.3 GROUND DISTANCE ...................................................................................... 9-12
9.5 POTT SIGNALING SCHEME
9.5.1 DESCRIPTION................................................................................................. 9-13
9.6 SERIES COMPENSATED LINES
9.6.1 DISTANCE SETTINGS ON SERIES COMPENSATED LINES ....................... 9-14
9.6.2 GROUND DIRECTIONAL OVERCURRENT ................................................... 9-15
9.7 LINES WITH TAPPED TRANSFORMERS
9.7.1 DESCRIPTION................................................................................................. 9-16
9.7.2 TRANSFORMER LOAD CURRENTS.............................................................. 9-16
9.7.3 LV-SIDE FAULTS ............................................................................................ 9-17
9.7.4 EXTERNAL GROUND FAULTS ...................................................................... 9-17
10.1 TESTING
10.1.1 CHANNEL TESTING ....................................................................................... 10-1
10.1.2 CLOCK SYNCHRONIZATION TESTS ............................................................ 10-2
10.1.3 CURRENT DIFFERENTIAL ............................................................................. 10-3
10.1.4 LOCAL-REMOTE RELAY TESTS ................................................................... 10-4
A.1 PARAMETER LIST
L90 Line Differential Relay ix